Dc Crompton Potentiometer Pdf
Projection Microscope
Advanced Projection Microscope
Microscope Body is heavy duty, inclined monocular type with sturdy base.
The Potentiometer is an instrument which measures unknown voltage by balancing it with a known voltage.The known source may be DC or AC. The working phenomenon of DC potentiometer and AC potentiometer is same. But there is one major difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage.
Advanced Projection Microscope
* Microscope Body is heavy duty, inclined monocular type with sturdy base.
* Equipped with Coarse & Fine Focusing systems with Quadruple revolving Nose Piece.
* Plain stage (120x120mm) with graduated Mechanical Stage for X-Y movements of specimen slide.
* Built in light by 6V-20W halogen lamp with continuously variable light intensity control.
* The whole system of condenser & light arrangement is moveable up & down by rack & pinion to get the optimum results.
* Projection Doom of screen size 150 mm is Rotatable through 360°.
* Objectives: Achromatic 10x & 20x/40x (SL)
* Projection Eye Piece: 10x (Huy)
* Packed in a thick and attractive plywood box.
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1 Energy Division Crompton Instruments Protector Trip Relays
2 Protector Trip Relays An extensive range of electronic control products providing continuous monitoring and protection of any electrical parameter. When the monitored parameter deviates from the desired set point limit, the relay will operate to prevent damage to the power asset. Designed to suit a wide variety of applications the range offers both traditional and technologically advanced products, from single parameter units through to multifunctional microprocessor based protection relays. This versatile range features a host of DIN-rail or wall mounted protectors offering numerous trip functions for single and three-phase power systems, including over and under-voltage, current, frequency, three-phase sequence, phase failure and phase balance. For the specific protection of generator sets, the range offers unbalanced current, reverse power flow, reverse VAr, syncro-check and under/over-speed trip relay functions. Various dc models provide protection of battery and UPS systems and a range of temperature protection products is ideal to prevent the damaging effects of overheating. Contents Page 250 Series DIN-rail and Wall Mounted 2 33 Single and three-phase protector relays offering continuous surveillance of electrical parameters with adjustable set point limits, differentials and time delay settings. Provide an alarm or initiation signal when the measured parameter moves outside the set point limit. Features Continuous monitoring of any electrical parameter Monitoring for under and overcurrent conditions Ensures load current is within generator capacity DIN-rail or wall mounted Range of outputs and configurations Adjustable trip points, time delay and differentials LED trip indication Designed to avoid nuisance tripping Benefits Protection of power assets Detection and isolation of faults Maintains supply continuity of healthy circuits High speed tripping to avoid damage Applications Switchgear Distribution systems Generator sets Control panels Energy management Building management Utility power monitoring Process control Motor protection Equipment and network protection 373-ELR Earth Leakage Protection For the continuous monitoring of fault current compared with user selectable leakage level. These DIN-rail units offer single set point, relay contacts and LED earth leakage level indicators or alarms. CBT-94F Core Balanced Current Transformers 36 Designed for use with the 373-ELR earth leakage protection relay, the range offers various case widths and apertures with a measurement range of up to 10A and a maximum 720V rated system voltage. 373-GFR Ground Fault Relay This compact DIN-rail ground fault relay allows the fault current to be continuously monitored and compared with the user selectable trip level. Ideally suited for any type of electrical equipment, specifically switchboards, generator sets and transformers. Vector Shift and ROCOF Relay A choice of DIN-rail or panel mounted units offering ROCOF (rate of change of frequency) and Vector Shift protection against loss of mains at the generator site. SPR System Protection Relay Cost effective and space saving microprocessor based relay, offering system protection, control and measurement of three-phase voltage and current, with 12 user definable relay outputs. RS232 to RS485 Serial Converter 48 Allows direct connection from the SPR system protection relay to SCADA or PC based systems. 1
3 250 Series DIN-rail and Wall Mounted Relays AC Current with Adjustable Time Delay 250 series ac current protectors provide continuous surveillance of the monitored circuit. When the current moves outside the set point limit for longer than the time delay, the relay operates. The protector can be used to monitor over and under-current conditions, load detection and for monitoring electric heating systems. An illuminated LED indicates when the relay is energised. For three-phase systems, the sequence of connection is not important. Features Single and three-phase options Adjustable set point Adjustable time delay Internal differential LED trip indication Double-pole relay contacts Automatic reset Benefits Ideal for any electrical load detection Over and under-current monitoring Suitable for electric heating systems Ensures load current is within generator capacity Detects broken drive belts on machinery Nuisance tripping avoidance Customised options Applications Marine panels Switchgear Distribution systems Generator sets Control panels Process control Motor protection Transformers Overload protection Operation AC current protectors provide continuous surveillance of the monitored circuit. These products offer user adjustable trip point (set point) and time delay settings. The set point adjustment range is between 40% and 120% of the nominal current. Input currents can be via current transformers or direct up to 10A. An internal differential setting of 1% reduces nuisance tripping if the measured signal is noisy or unstable. When the measured current moves outside the set point limit the relay will operate, giving an alarm or initiation signal. An adjustable time delay is provided to prevent the relay from tripping for a predetermined period to prevent nuisance tripping. The units draw their operating power from a separate auxiliary supply input. Single-phase and three-phase products are available. Three-phase products monitor the current level for each phase and are not phase sequence sensitive. Combined units offer under and over-current trips in one compact unit. Single function units are also available. Over-Current Models When the monitored current exceeds the set point, the relay will energise and the red LED will illuminate to indicate the trip condition. The relay will automatically reset once the monitored current falls below the set point minus the differential. When reset, the LED will extinguish and the relay de-energises. Under-Current Models When the monitored current falls below the set point, the relay will de-energise and the red LED will extinguish to indicate the trip condition. The relay will automatically reset once the monitored current rises above the set point plus the differential. When reset, the LED will illuminate and the relay energises. Options 250 series protector relays offer various customised options to suit individual requirements. Please consult factory. Adjustment ranges different adjustment ranges are possible for the set point and differential controls. Relay operation standard models are fail safe, but the relays can be customised to energise or de-energise on trip. Product Codes Relay Protection ANSI no. Cat. no. 1-phase Under-current % PAU 1-phase Over-current % PAO 1-phase Under and over-current 37/ PAD 3-phase 3- or 4-wire Under-current % PAV 3-phase 3- or 4-wire Over-current % PAP Please specify system voltage, system current, frequency and required options at time of ordering. 2
4 Specifications Nominal input current 1A or 5A from CT secondary. 0.2A to 10A available on request Nominal frequency 50, 60 or 400Hz Input current burden 0.5VA per phase Overload 2 x rating continuously, 10 x rating for 3 seconds Set point repeatability >0.5% of full span Differential (hysteresis) Pre-set at 1%. Values 1% to 10% available on request Trip level adjustment 40 to 120%. Customised adjustment available Time delay adjustable 0 to 10 seconds AC auxiliary supply voltage 100V, 110V, 120V, 208V, 220V, 240V, 480V, ±20% DC auxiliary supply voltage 12V, 24V, 48V, 110V or 125V, ±20%. Including ripple Auxiliary voltage burden 4VA (max) Output relay 2-pole change over Relay contact rating AC: 240V 5A, non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and nonfunction to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 Model 252 dimensions 55mm (2.2') wide x 70mm (2.8') high x 112mm (4.4') deep Model 253 dimensions 75mm (2.9') wide x 70mm (2.8') high x 112mm (4.4') deep Weight Model 252: 0.4Kg approx. Model 253: 0.6Kg approx. Connections 252-PAU 252-PAO Relay Contact Set 1 Contact Set 2 Input 253-PAD Input 253-PAP 253-PAV Under Relay Contact Set 1 Under Relay Contact Set 2 Input 1 Input 2 Supply Supply Over Relay Contact Set 1 Over Relay Contact Set 2 Input 3 Model mm (2.8 ) 55mm (2.2 ) 35mm (1.37 ) 75mm (2.9 ) 112.5mm (4.4 ) 60mm (2.4 ) 35mm (1.37 ) 70mm (2.8 ) 50mm (1.96 ) 60mm (2.36 ) 112mm (4.4 ) 35mm (1.37 ) 55mm (2.2 ) 17.5mm (0.68 ) 35mm (1.37 ) 2 HOLES Ø mm (0.5 ) 15.5mm (0.6 ) Relay Contact Set 1 Supply Relay Contact Set 2 RELEASE CLIP Model 253 RELEASE CLIP 2 FIXING HOLE 'A' TO SUIT M4 2 FIXING HOLE 'A' TO SUIT M4 3
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5 250 Series DIN-rail and Wall Mounted Relays AC Voltage with Adjustable Differential The ac voltage protectors provide continuous surveillance of the monitored circuit. When the measured voltage moves outside the set point limit for longer than the time delay, the relay will operate giving an alarm or initiation signal. The protector can be used for under and over-voltage detection, start standby generators, operation of mains failure units and switching standby supplies. An illuminated LED indicates when the relay is energised. The three-phase, three or four-wire models, protect each phase independently. Features Single and three-phase models Adjustable set point Adjustable differential Internal time delay LED trip indication Double-pole relay contacts Automatic reset Benefits Over and under-voltage monitoring Start standby generators Operation of mains failure units Switching standby supplies Monitors genset AVR and excitation systems Nuisance tripping avoidance Customised options Applications Marine panels Switchgear Distribution systems Generator sets Control panels Process control Motor protection Transformers Overload protection Description AC voltage protectors offer user adjustable trip point (set point) and differential (hysteresis) settings. The set point adjustment range is 25%, operating between 75% and 100% of the nominal supply for under-voltage units and between 100% and 125% for the over-voltage units. The differential setting adjustment range is 1% to 15% and it can be used to reduce nuisance tripping if the measured signal is noisy or unstable. When the measured voltage moves outside the set point limit, the relay will operate, giving an alarm or initiation signal. As soon as the monitored signal moves outside of the set point limit, a trip will occur. A fixed time delay is available as a factory option, preventing the relay from tripping for a predetermined period to prevent nuisance tripping. The units draw their operating power from the measuring inputs, although a separate auxiliary supply input option is available on some models. Three-phase products monitor the voltage level for each phase and are not phase sequence sensitive. Combined units offer under and over-voltage trips in one compact unit. Single function units are also available. Over-Voltage Models When the monitored voltage exceeds the set point, the relay will energise and the red LED will illuminate to indicate the trip condition. The relay will automatically reset once the monitored voltage falls below the set point minus the differential. When reset, the LED will extinguish and the relay de-energises. Under-Voltage Models When the monitored voltage falls below the set point, the relay will de-energise and the red LED will extinguish to indicate the trip condition. The relay will automatically reset once the monitored voltage rises above the set point plus the differential. When reset, the LED will illuminate and the relay energises. Options 250 series protector relays offer various customised options to suit individual requirements. Please consult factory. Time delay internal fixed time delay before a trip occurs. Separate auxiliary supply sometimes required to maintain a time delay or energised relay when the monitored signal fails. Adjustment ranges different adjustment ranges are possible for the set point and differential controls. Relay operation standard models are fail safe, but the relays can be customised to energise or de-energise on trip. Product Codes Relay Protection ANSI no. Cat. no. 1-phase Under-voltage % PVU 1-phase Over-voltage % PVO 1-phase Under and over-voltage 27/ PVB 3-phase 3-wire Under-voltage % PVK 3-phase 3-wire Over-voltage % PVA 3-phase 3-wire Under and over-voltage 27/ PVM 3-phase 4-wire Under-voltage % PVV 3-phase 4-wire Over-voltage % PVP 3-phase 4-wire Under and over-voltage 27/ PVE 4 Please specify system voltage, frequency and required options at time of ordering.
6 Specification AC Voltage with Adjustable Differential Nominal voltage 100V, 110V, 120V, 208V, 220V, 270V, 280V, 400V, 415V or 440V System frequency 45/65Hz or 360/440Hz Voltage burden 0.3VA approx. Overload 1.2 x rating continuously, 1.5 x rating for 10 x seconds Set point repeatability >0.5% of full span Differential (hysteresis) Adjustable range 1 to 15% Trip level adjustment Under-voltage: 75 to 100% Over-voltage: 100 to 125% of nominal input voltage Time delay Factory pre-set up to 30 seconds AC auxiliary supply voltage 100V, 110V, 120V, 208V, 220V, 240V, 480V, ±20% DC auxiliary supply voltage 12V, 24V, 48V, 110V or 125V, ±20%. Including ripple Auxiliary voltage burden 4VA (max) Output relay 2-pole change over Relay contact rating AC: 240V 5A, non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 Model 252 dimensions 55mm (2.2') wide x 70mm (2.8') high x 112mm (4.4') deep Model 253 dimensions 75mm (2.9') wide x 70mm (2.8') high x 112mm (4.4') deep Weight Model 252: 0.4Kg approx. Model 253: 0.6Kg approx. Model mm (2.8 ) 55mm (2.2 ) 35mm (1.37 ) 112mm (4.4 ) RELEASE CLIP 35mm (1.37 ) 17.5mm (0.68 ) 55mm (2.2 ) 35mm (1.37 ) 2 HOLES Ø mm (0.5 ) 15.5mm (0.6 ) Connections Relay 252-PVU Contact Set 1 Contact Set PVO 252-PVV 252-PVP 252-PVK 252-PVA 253-PVB 253-PVM 253-PVM Under Relay Contact Set 1 Under Relay Contact Set 2 3-phase Input L N Single-phase Input Input Over Relay Contact Set 1 Aux supply when required Over Relay Contact Set 2 75mm (2.9 ) 112.5mm (4.4 ) 60mm (2.4 ) Input Model mm (1.37 ) 70mm (2.8 ) 50mm (1.96 ) 60mm (2.36 ) RELEASE CLIP 2 FIXING HOLE 'A' TO SUIT M4 2 FIXING HOLE 'A' TO SUIT M4 Input Note: The neutral connection is always used on four-wire systems. 5
7 250 Series DIN-rail and Wall Mounted Relays AC Voltage with Adjustable Time Delay The ac voltage protectors provide continuous surveillance of the monitored circuit. When the measured voltage moves outside the set point limit, the relay will operate after the selected time delay, giving an alarm or initiation signal. Relays normally energise on overvolts and de-energise on undervolts. An illuminated LED indicates when the relay is energised. Features Adjustable set point Adjustable time delay Internal differential LED trip indication Double-pole relay contacts Automatic reset Benefits Over and under-voltage monitoring Close voltage control Start standby generators Operation of mains failure units Switching standby supplies Protecting computer supplies Monitors genset AVR and excitation systems Nuisance tripping avoidance Customised options Applications Switchgear Distribution systems Generator sets Control panels Process control Motor protection Transformers Overload protection Operation AC voltage protectors offer user adjustable trip point (set point) and time delay settings. The set point adjustment range is 25%, operating between 75% and 100% of the nominal supply for under-voltage units and between 100% and 125% for the over-voltage units. The time delay setting adjustment range is typically 0 to 10 seconds, although longer delays are available. As soon as the monitored signal moves outside of the set point limit, the time delay is activated, after which a trip will occur. The time delay prevents the relay from tripping for a predetermined period to prevent nuisance tripping. The products also feature an internal differential (hysteresis) setting of 1% to reduce nuisance tripping if the measured signal is noisy or unstable. The units draw their operating power from the measuring inputs, although a separate auxiliary supply input option is available on some models. Single-phase and three-phase products are available. Three-phase products monitor the voltage level for each phase and are not phase sequence sensitive. Over-Voltage Models When the monitored voltage exceeds the set point, the time delay is started. When the time has elapsed, the relay will energise and the red LED will illuminate to indicate the trip condition. The relay will automatically reset once the monitored voltage falls below the set point minus the differential. When reset, the LED will extinguish and the relay de-energises. The time delay is not active when resetting. Under-Voltage Models When the monitored voltage falls below the set point, the time delay is started. When the time has elapsed, the relay will de-energise and the red LED will extinguish to indicate the trip condition. The relay will automatically reset once the monitored voltage rises above the set point plus the differential. When reset, the LED will illuminate and the relay energises. The time delay is not active when resetting. Options 250 series protector relays offer various customised options to suit individual requirements. Please consult factory. Adjustment ranges different adjustment ranges are possible for the set point and differential controls. Separate auxiliary supply sometimes required to maintain a time delay. Differential internally fixed value between 1% and 15%. Relay operation standard models are fail safe, but the relays can be customised to energise or de-energise on trip. Product Codes Relay Protection ANSI no. Cat. no. 1-phase Under-voltage % PVZ 1-phase Over-voltage % PVH 3-phase 3-wire Under-voltage % PVJ 3-phase 3-wire Over-voltage % PVC 3-phase 4-wire Under-voltage % PVX 3-phase 4-wire Over-voltage % PVS Please specify system voltage, frequency and required options at time of ordering. 6
8 Specification AC Voltage with Adjustable Time Delay Nominal voltage 100V, 110V, 208V, 240V, 277V, 400V, 415V, 440V or 480V System frequency 45/65Hz or 360/440Hz Voltage burden 0.3VA Overload 1.2 x rating continuously, 1.5 x rating for 10 x seconds Set point repeatability >0.5% of full span Differential (hysteresis) Pre-set at 1%. Other values 1% to 10% to order Trip level adjustment Under-voltage: 75 to 100% Over-voltage: 100 to 125% of nominal input voltage Time delay Adjustable up to 10 seconds AC auxiliary supply voltage 100V, 110V, 120V, 208V, 220V, 240V, 480V, ±20% DC auxiliary supply voltage 12V, 24V, 48V, 110V or 125V, ±20%. Including ripple Auxiliary voltage burden 4VA (max) Output relay 2-pole change over Relay contact rating AC: 240V 5A, non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 55mm (2.2') wide x 70mm (2.8') high x 112mm (4.4') deep Weight 0.4Kg approx. Connections 252-PVZ 252-PVH Relay Contact Set 1 Contact Set 2 Input 252-PVX 252-PVS 252-PVC 252-PVJ Aux supply when required Relay Contact Set 1 Contact Set 2 Input Aux supply when required Note: The neutral connection is always used on four-wire systems. Model mm (2.8 ) 55mm (2.2 ) 35mm (1.37 ) 112mm (4.4 ) 35mm (1.37 ) 17.5mm (0.68 ) 55mm (2.2 ) 35mm (1.37 ) 2 HOLES Ø mm (0.5 ) 15.5mm (0.6 ) RELEASE CLIP 7
9 250 Series DIN-rail and Wall Mounted Relays Frequency Crompton frequency protectors give continuous surveillance of the monitored circuit. When the frequency moves outside the set point limit for longer than the time delay, the relay will operate giving an alarm control or tripping signal. An illuminated LED indicates when the relay is energised. Since speed is proportional to the frequency, this protector can be used to monitor over and under-speed and to protect mains supplies, computer supplies and standby supplies for industrial, hospital or marine use. Features Adjustable set point Adjustable differential LED trip indication Double-pole relay contacts Automatic reset Benefits Over and under-frequency monitoring Over and under-speed monitoring Start standby generators Operation of mains failure units Switching standby supplies Protection of control gear Nuisance tripping avoidance Customised options Applications Marine panels Switchgear Distribution systems Generator sets Control panels Process control Motor protection Transformers Overload protection Operation Frequency protectors offer user adjustable frequency trip point (set point) and differential (hysteresis) settings. The set point adjustment range is centred around the nominal 50Hz, 60Hz or 400Hz system frequency. The differential setting adjustment can be used to reduce nuisance tripping if the measured signal is noisy or unstable. When the measured frequency moves outside the set point limit, the relay will operate, giving an alarm or initiation signal. As soon as the monitored frequency moves outside of the set point limit, a trip will occur. The units draw their operating power from the measuring inputs. Combined units offer under and overfrequency trips in one compact unit. Single function units are also available. Over-Frequency Models When the monitored frequency exceeds the set point, the relay will energise and the red LED will illuminate to indicate the trip condition. The relay will automatically reset once the monitored frequency falls below the set point minus the differential. When reset, the LED will extinguish and the relay de-energises. Under-Frequency Models When the monitored frequency falls below the set point, the relay will de-energise and the red LED will extinguish to indicate the trip condition. The relay will automatically reset once the monitored frequency rises above the set point plus the differential. When reset, the LED will illuminate and the relay energises. Options 250 series protector relays offer various customised options to suit individual requirements. Please consult factory. Adjustment ranges different adjustment ranges are possible for the set point and differential controls. Time delay internal fixed time delay before a trip occurs. Relay operation standard models are fail safe, but the relays can be customised to energise or de-energise on trip. Product Codes Relay Protection ANSI no. Cat. no. 1-phase Under-frequency 81U 252-PHU 1-phase Over-frequency 81O 252-PHO 1-phase Under and over frequency 81O/U 253-PHD Please specify system voltage, frequency and required options at time of ordering. 8
10 Specification Frequency Nominal voltage 100V, 110V, 120V, 208V, 220V, 230V, 240V, 277V, 380V, 400V, 415V, 440V or 480V ±20% System frequency 40/60Hz, 50/70Hz or 360/440Hz Voltage burden 3VA Overloads 1.2 x rating continuously, 1.5 x rating for 10 x seconds Set point repeatability >0.5% of full span Differential (hysteresis) 40/60Hz, 50/70Hz: Adjustable 0.1 to 3.0Hz 360/440Hz: Adjustable 10 to 30Hz Output relay 2-pole change over Relay contact rating AC: 240V 5A, non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 Model 252 dimensions 55mm (2.2') wide x 70mm (2.8') high x 112mm (4.4') deep Model 253 dimensions 75mm (2.9') wide x 70mm (2.8') high x 112mm (4.4') deep Weight Model 252: 0.4Kg approx. Model 253: 0.6Kg approx. Model mm (2.8 ) 55mm (2.2 ) 35mm (1.37 ) 112mm (4.4 ) RELEASE CLIP 35mm (1.37 ) 17.5mm (0.68 ) 55mm (2.2 ) 35mm (1.37 ) 2 HOLES Ø mm (0.5 ) 15.5mm (0.6 ) Connections 252-PHU 252-PHO 253-PHD Output Relay Contact Set 1 Contact Set 2 Input Under Relay Contact Set 1 Under Relay Contact Set 2 Input Over Relay Contact Set 1 Over Relay Contact Set 2 Model mm (2.9 ) 112.5mm (4.4 ) 60mm (2.4 ) 35mm (1.37 ) 70mm (2.8 ) 50mm (1.96 ) 60mm (2.36 ) RELEASE CLIP 2 FIXING HOLE 'A' TO SUIT M4 2 FIXING HOLE 'A' TO SUIT M4 9
11 250 Series DIN-rail and Wall Mounted Relays Combined Under/Over-Voltage and Frequency The 250 series combined voltage and frequency protectors provide continuous surveillance of the monitored circuit. When the voltage or frequency moves outside the set point limit for longer than the time delay, the respective relay will operate giving an alarm, control or tripping signal. An illuminated LED indicates when the relay is energised. This protector can be used to protect against over and under-speed and over and under-voltage. Features Adjustable set point Adjustable time delay Internal differential LED trip indication Double-pole relay contacts Automatic reset Benefits Over and under-voltage monitoring Over and under-speed monitoring Start standby generators Operation of mains failure units Switching standby supplies Monitors genset AVR and excitation systems Nuisance tripping avoidance Customised options Applications Switchgear Distribution systems Generator sets Control panels Process control Motor protection Transformers Overload protection Operation Combined voltage and frequency protectors provide the most popular relay functions in one convenient package. The products offer user adjustable trip point (set point) for voltage and frequency, plus adjustable time delay settings. The set point adjustment range is 25%, operating between 75% and 100% of the nominal supply for under-voltage and between 100% and 125% for over-voltage. The frequency set point adjustment range is centred around the nominal 50Hz, 60Hz or 400Hz system frequency. The time delay setting adjustment range is typically 0 to 10 seconds, although longer delays are available. As soon as the monitored signal moves outside of the set point limit, the time delay is activated, after which a trip will occur. The time delay prevents the relay from tripping for a predetermined period to prevent nuisance tripping. The products also feature an internal differential (hysteresis) setting of 1% to reduce nuisance tripping if the measured signal is noisy or unstable. The product is available for single-phase systems only and draws its operating power from the measuring input. Over-Voltage and Frequency When the monitored value exceeds the set point and the time delay has elapsed, the relay will energise and the red LED will illuminate to indicate the trip condition. Under-Voltage and Frequency The relay will de-energise after the time delay has elapsed and the red LED will extinguish to indicate the trip condition. Options 250 series protector relays offer various customised options to suit individual requirements. Please consult factory. Adjustment ranges different adjustment ranges are possible for the set point and time delay controls. Differential internally fixed value between 1% and 15%. Relay operation standard models are fail safe, but the relays can be customised to energise or de-energise on trip. Product Codes Relay Protection ANSI no. Cat. no. 1-phase Over and under-voltage, 27/59, 256-PHV over and under-frequency 81O/U Please specify system voltage, frequency and required options at time of ordering. 10
12 Specification Combined Under/Over and Frequency Nominal voltage 100V, 110V, 120V, 208V, 220V, 270V, 280V, 400V, 415V or 440V System frequency Frequency differential 40/60Hz, 50/70Hz or 360/440Hz Pre-set at 0.1Hz (10Hz for 400Hz unit) Voltage burden 3VA Overloads 1.2 x rating continuously, 1.5 x rating for 10 x seconds Set point repeatability >0.5% of full span Differential (hysteresis) Fixed internally at 1% Trip level adjustment Over-voltage: 100 to 125% Under-voltage: 75 to 100% of nominal input voltage Time delay Adjustable 1 to 30 seconds Output relay 4 independent 2-pole change over Relay contact rating AC: 240V 5A non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 150mm (5.9') wide x 70mm (2.8') high x 112mm (4.4') deep Weight 1.0Kg approx. Model FIXING HOLE 'A' TO SUIT M4 150mm (5.9 ) 112.5mm (4.4 ) RELEASE CLIP 135mm (5.3 ) 2 FIXING HOLE 'A' TO SUIT M4 70mm (2.8 ) 50mm (1.96 ) 60mm (2.36 ) 35mm (1.37 ) Connections 256-PHV Under-Voltage Relay Contact Set 1 Over-Voltage Relay Contact Set 1 Under-Frequency Relay Contact Set 1 Over-Frequency Relay Contact Set 1 Input Contact Set 2 Contact Set 2 Contact Set 2 Contact Set 2 11
13 250 Series DIN-rail and Wall Mounted Relays Phase Sequence and Phase Failure The Crompton phase sequence and phase failure protector relays are designed to monitor the correct phase rotation or sequence of three-phase, three or four-wire supply systems and provide protection against incorrect phase sequence, loss of one phase and under-voltage. Features Three-phase, three or four-wire LED trip indication Double-pole relay contacts Automatic reset Benefits Monitoring of correct phase rotation Protection against incorrect phase sequence and loss of phase Under-voltage monitoring Prevents reverse rotation of motor driven equipment Ensures correct engine rotation Protects portable electrical equipment Applications Marine panels Switchgear Distribution systems Generator sets Control panels Process control Motor protection Transformers Overload protection Operation Rotating machines are particularly vulnerable to incorrect phase sequence. Three-phase motors can rotate in the wrong direction, potentially leading to physical damage or the risk of injury to personnel, yet voltage and current readings may appear normal. If one phase is lost because of a blown fuse, electric motors can continue to operate (single-phasing) which can result in severe electrical or mechanical damage. For permanent installations, this relay should be used to monitor the incoming supply, protecting all equipment against incorrect connection at initial installation or after maintenance work. Rotating machines that cannot tolerate reverse rotation or pose significant risk to personnel under this condition should be individually protected with this relay. The possibility of incorrect supply connection is much more likely in portable equipment or marine applications. The phase sequence and phase failure protectors continuously monitor the three-phase supply. With the correct phase sequence applied, the front panel LED will illuminate and the output relay will be energised. An incorrect sequence or missing phase will de-energise the relay and the LED will be extinguished. If the supply drops below 85% of its nominal voltage, this condition will also cause a trip. Note: If one phase is lost due to a blown fuse, some loads can re-generate the missing voltage. This relay can be used as a phase failure relay providing the regenerated voltage in the open phase is less than 70% of the nominal supply voltage. If there is the possibility of a higher regenerated voltage, the phase balance relay 252-PSF should be used. Product Codes Relay Protection ANSI no. Cat. no. 3-phase 3- or 4-wire Phase sequence, PVR under-voltage 85% Please specify system voltage, frequency and required options at time of ordering. 12
14 Specification Phase Sequence and Phase Failure Nominal voltage 110V, 120V, 208V, 220V, 230V, 240V, 277V, 380V, 400V, 415V, 440V or 480V Nominal frequency 50, 60 or 400Hz Voltage burden 3VA approx. Overload 1.2 x rating continuously, 1.5 x rating for 10 x seconds to symmetric Trip level adjustment Pre-set at 85% of nominal Auxiliary voltage burden 4VA (max) Output relay 2-pole change over Relay contact rating AC: 240V 5A, non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 Model 252 dimensions 55mm (2.2') wide x 70mm (2.8') high x 112mm (4.4') deep Weight 0.4Kg approx. Connections 252-PVR Relay Contact Set 1 Contact Set 2 Input Note: No neutral connection is required. Model mm (2.8 ) 55mm (2.2 ) 35mm (1.37 ) 112mm (4.4 ) 35mm (1.37 ) 55mm (2.2 ) 17.5mm (0.68 ) 35mm (1.37 ) 2 HOLES Ø mm (0.5 ) 15.5mm (0.6 ) RELEASE CLIP 13
15 250 Series DIN-rail and Wall Mounted Relays Phase Balance The 250 series phase balance protector module provides continuous surveillance of a three-phase, three- or four-wire system and monitors the correct phase rotation or sequence of three-phase supply systems. The module protects against phase loss, reversal or sequence, phase unbalance and system under-voltage. Features Three-phase, three or four-wire Adjustable set point Adjustable time delay Internal differential LED trip indication Double-pole relay contacts Automatic reset Benefits Monitoring of correct phase rotation Protects against phantom or regenerated phase voltage Protection against phase loss, reversal or sequence Under-voltage and unbalanced voltage monitoring Prevents reverse rotation of motor driven equipment Ensures correct engine rotation Protects portable electrical equipment Nuisance tripping avoidance Applications Marine panels Switchgear Distribution systems Generator sets Control panels Process control Motor protection Transformers Overload protection Operation Rotating machines are particularly vulnerable to incorrect phase sequence. Threephase motors can rotate in the wrong direction, potentially leading to physical damage or the risk of injury to personnel, yet voltage and current readings may appear normal. If one phase is lost because of a blown fuse, electric motors can continue to operate (single-phasing) which can result in severe electrical or mechanical damage. This relay has the added advantage that it will detect the phantom or regenerated phase that can be caused by a single-phase failure on some equipment or when running motors at low load levels. An unbalanced supply voltage can lead to temperature rises in motors. An unbalanced voltage as little as 10% can increase operating temperature to 150% of normal. For permanent installations, this relay should be used to monitor the incoming supply, protecting all equipment against incorrect connection at initial installation or after maintenance work. Rotating machines that cannot tolerate reverse rotation or pose significant risk to personnel under this condition should be individually protected with this relay. The possibility of incorrect supply connection is much more likely in portable equipment or marine applications. The protector continuously monitors the three-phase supply. With the correct phase sequence applied and all three voltages balanced within the required limits, the front panel LED will illuminate and the output relay will be energised. An incorrect sequence, missing phase, out of balance or under-voltage condition will de-energise the relay and the LED will be extinguished. The set point control allows adjustment of the voltage matching between 5% and 15%. The time delay function operates only for the voltage unbalance condition. The delay can be used to prevent nuisance tripping due to short term unbalance situations. Incorrect phase rotation, a missing phase or an under-voltage condition trip the relay immediately. Product Codes Relay Protection ANSI no. Cat. no. 3-phase 3- or 4-wire Phase loss and PSF unbalance 5-15% 3-phase 3- or 4-wire Phase loss, unbalance 47/ PSG and under-voltage 5-15% Please specify system voltage, frequency and required options at time of ordering. 14
16 Specification Phase Balance Nominal voltage 110V, 120V, 208V, 220V, 230V, 240V, 277V, 380V, 400V, 415V, 440V or 480V System frequency 50 or 60Hz Voltage burden 3VA approx. Overload 1.2 x rating continuously, 1.5 x rating for 10 x seconds Set point repeatability >0.5% of full span Under-voltage set point Pre-set at 15% of nominal voltage. Other values 10 to 30% to order (model 252-PSG only) Trip level adjustment Phase unbalance adjustable 5 to 15% Time delay 10 seconds as standard. Up to 30 seconds available Auxiliary voltage burden 4VA (max) Output relay 2-pole change over Relay contact rating AC: 240V 5A, non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 Model 252 dimensions 55mm (2.2') wide x 70mm (2.8') high x 112mm (4.4') deep Weight 0.4Kg approx. Connections 252-PSF Relay 252-PSG Contact Set 1 Contact Set 2 Input Note: Neutral connection not required. Model mm (2.8 ) 55mm (2.2 ) 35mm (1.37 ) 112mm (4.4 ) 35mm (1.37 ) 17.5mm (0.68 ) 55mm (2.2 ) 35mm (1.37 ) 2 HOLES Ø mm (0.5 ) 15.5mm (0.6 ) RELEASE CLIP 15
17 250 Series DIN-rail and Wall Mounted Relays Reverse Power (current) The reverse power protector provides continuous surveillance for ac generators operating in parallel or for boosting mains supplies. On site adjustment of the trip point and time delay ensures accurate protection against motoring in the event of engine failure and prevents tripping from surges during synchronising. Operation Reverse power protectors provide continuous surveillance of ac generators against motoring. Reverse power relays are used to detect the failure of the prime mover (engine) when active energy (Watts) flows into the generator causing rotation the set will operate like an electric motor which can cause significant mechanical damage. This relay offers an adjustable reverse power set point between 2% and 20% of nominal power and time delay adjustment range of 0 to 20 seconds. Features Three-phase, three or four-wire Adjustable set point Adjustable time delay Internal differential LED trip indication Double-pole relay contacts Automatic reset Benefits Current and power factor measurement Protects generators against motoring Detects reverse power under fault conditions Customised options Nuisance tripping avoidance Applications Marine panels Switchgear Distribution systems Generator sets Control panels Process control Motor protection Transformers Overload protection As soon as the reverse power level increases above the set point limit, the time delay is activated, after which a trip will occur. The time delay prevents the relay from tripping for a predetermined period to prevent nuisance tripping. The products also feature an internal differential (hysteresis) setting of 1% to reduce nuisance tripping if the measured signal is noisy or unstable. These units are powered from the measuring supply. The protector relay estimates the power level in the system by measuring current and power factor, but does not actually measure the system voltage. When the reverse power level exceeds the set point, the time delay is started. When the time has elapsed, the relay will energise and the red LED will illuminate to indicate the trip condition. The relay will automatically re-set once the power level falls below the set point minus the differential. The LED will extinguish and the relay de-energises. The time delay is not active when resetting. The reverse power level will trip as expected at the calibrated point for unity power factor. However, the system power factor does affect the trip point calibration. The relay becomes more sensitive at lagging power factors, as almost all systems exhibit inductance. At leading power factors, this relay is less sensitive. Setting Up The % set potentiometer trimmer on the front label is calibrated as a percentage of the input current rating e.g. of 5A and not of the forward kw. Adjust the % set trimmer to the required tripping value, 7.5% to 10% is normal. Setting accuracy can be checked by reversing the current lead connections and, with forward power, measuring the trip point value on a suitable ammeter (reconnect leads on completion). Adjust the Delay to the required time delay, 10 seconds is normally adequate. Options 250 series protector relays offer various customised options to suit individual requirements. Please consult factory. Adjustment ranges different adjustment ranges are possible for the set point and time delay controls. Relay operation standard models are fail safe, but the relays can be customised to de-energise on trip. Product Codes Relay Protection ANSI no. Cat. no. 1-phase or Reverse power 2 20% PAS 3-phase 4-wire 1-phase or 3-phase Reverse power 2 20% PAQ 4-wire. Push to test 3-phase 3-wire Reverse power 2 20% PAR Push to test 3-phase 3-wire Reverse power 2 20% PAT Please specify system voltage, frequency and required options at time of ordering. 16
18 Specification Reverse Power (Current) Nominal voltage 100V, 110V, 120V, 220V, 230V, 240V, 277V, 380V, 400V, 415V, 440V or 480V Nominal current 5A or 2, 3, 4, 6, 8 and 10A System frequency 50, 60 or 400Hz Burden Voltage: 3VA maximum Current: 2VA maximum Current overload 2 x rating continuously, 10 x rating for 3 seconds Voltage overload 1.2 x rating continuously, 1.5 x rating for 10 seconds Monitoring range Power factor: 0.5 inductive/unity/0.2 capacitive Current: 20 to 100% of nominal input Set point repeatability >0.5% of full span Differential (hysteresis) Pre-set at 1% Trip level adjustment 2 to 20%. Customised adjustment available Time delay adjustable 0 to 20 seconds Output relay 2-pole change over Relay contact rating AC: 240V 5A, non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 150mm (5.9') wide x 70mm (2.8') high x 112mm (4.4') deep Weight 1.0Kg approx. Model FIXING HOLE 'A' TO SUIT M4 150mm (5.9 ) 135mm (5.3 ) 112.5mm (4.4 ) RELEASE CLIP 2 FIXING HOLE 'A' TO SUIT M4 70mm (2.8 ) 50 (1.96) 60 (2.36) 35mm (1.37 ) Connections 256-PAS 256-PAT 256-PAQ 256-PAR Input volts 1-phase 3-phase 4-wire 3-phase 3-wire Contact Set 1 Contact Set 2 Output Relay Input Amps Note: Only one CT connection is required, from the same phase as the voltage connection to terminal 2. 17
19 250 Series DIN-rail and Wall Mounted Relays Synchro-Check (parallelling) The synchro-check relay can be used to assist in the semi-automatic parallelling of two ac power systems. The volt-free relay contacts change state when the voltage level, phase relationship and frequency are within the selected synchronising limits. Connecting two electrical systems that are not closely matched can cause expensive damage and disturbance to the electrical system. Using this relay will ensure that damage will not occur. Features Single-phase or three-phase, three or four-wire Live and dead bus versions Adjustable set point LED trip indication Volt free relay contacts Benefits Monitors voltage phase displacement and frequency of 2 supplies Frequency matching Voltage matching Phase angle matching Synchronisation of Gen-Bus and Bus-Bus Monitors auto synchronising systems Assists in manual synchronisation Applications Marine panels Switchgear Distribution systems Generator sets Co-generation Control panels Operation As part of a manual control system, the operator will make adjustments to the generator voltage (excitation) and frequency (engine speed) using a synchroscope or lamps and will then attempt to manually close the breaker. This synchro check protector will qualify that the two systems are closely matched before permitting the breaker to close. As part of an automatic synchronising arrangement, this relay can be used as an independent backup or checking device to ensure the two systems are suitably matched before the breaker can close. Model 256-PLL The relay continuously monitors the voltage, phase displacement and frequency of two supplies. A single set point adjustment permits selection of suitable matching and a red LED illuminates when the relay is energised, indicating that the two supplies are well matched and it is safe to close the breaker. Model 256-PLD This version operates in the same way as model 256-PLL but includes an additional dead bus detection function. If there is a requirement for a continuous supply or emergency power, then the generator can be connected without synchronising, thus ensuring continuity of supply. The absence of bus voltage will cause the relay to energise. Product Codes Relay Protection ANSI no. Cat. no. 1-phase, or Phase angle and voltage PLL 3-phase 3- or 4-wire 1-phase, or Phase angle and voltage PLD 3-phase 3- or 4-wire Dead bus Please specify system voltage, frequency and required options at time of ordering. 18
20 Specification Synchro-Check (parallelling) Nominal voltage 100V, 110V, 120V, 208V, 220V, 230V, 240V, 277V, 380V, 400V, 415V, 440V or 480V System frequency 45, 50, 55, 60 or 65Hz Burden Bus: 2VA Generator: 4VA Overload 25 to +30% of the nominal voltage Set point repeatability >0.5% of full span Differential (hysteresis) Pre-set at 1%. Values 1 to 10% available on request Trip level 10 to 30% of the nominal voltage 6 to 20 electrical adjustment Output relay 1 pair NO (normally open), 1 pair NC (normally closed) 2 pair NO and 2 pair NC available on request Relay contact rating AC: 240V 5A non inductive DC: 24V 5A resistive Relay mechanical life 0.2 million operations at rated loads Relay reset Automatic Operating temperature 0 C to +60 C (0 C to +40 C for UL models) Storage temperature 20 C to +70 C Temperature co-efficient 0.05% per C Interference immunity Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a Enclosure style DIN-rail with wall mounting facility Material Flame retardant polycarbonate/abs Enclosure integrity IP50 150mm (5.9') wide x 70mm (2.8') high x 112mm (4.4') deep Weight 1.0Kg approx. Model FIXING HOLE 'A' TO SUIT M4 150mm (5.9 ) 135mm (5.3 ) 112.5mm (4.4 ) RELEASE CLIP 2 FIXING HOLE 'A' TO SUIT M4 70mm (2.8 ) 50mm (1.96 ) 60mm (2.36 ) 35mm (1.37 ) Connections 256-PLL 256-PLD System 3-phase 4-wire 3-phase 3-wire 1-phase 2-wire Generator Connections 1 2 L1 N L1 L2 L1 N Busbar Connections 3 4 L1 N L1 L2 L1 N Normally Open Contacts Normally Closed Contacts 19
21 250 Series DIN-rail and Wall Mounted Relays DC Voltage DC voltage protectors provide continuous surveillance of the monitored voltage circuit, typically a battery supply or charging circuit. When the measured voltage moves outside the set point limits, the relay will operate after the selected time delay or differential, giving an alarm and/or initiation signal. The protectors offer protection for under-voltage, over-voltage and battery level control. Features Adjustable set point Adjustable time delay Internal differential LED trip indication Automatic reset Double-pole relay contacts Benefits Over and under-voltage monitoring Monitors correct terminal voltage on battery supplies Monitors charging voltage on battery chargers Battery level control Nuisance tripping avoidance Customised options Applications Marine panels Switchgear Distribution systems Generator sets Control panels Process control Overload protection Operation DC voltage protectors offer user adjustable trip point (set point) and time delay settings. The time delay setting adjustment range is typically 0 to 10 seconds, although longer delays up to 30 seconds are available. As soon as the monitored signal moves outside of the set point limit, the time delay is activated, after which a trip will occur. The time delay prevents the relay from tripping for a predetermined period to prevent nuisance tripping. The products also feature an internal differential (hysteresis) setting of 1% to reduce nuisance tripping if the measured signal is noisy or unstable. The units draw their operating power from the measuring inputs. Over-Voltage Models When the monitored voltage exceeds the set point, the time delay is started. When the time has elapsed, the relay will energise and the red LED will illuminate to indicate the trip condition. The relay will automatically reset once the monitored voltage falls below the set point minus the differential. When reset, the LED will extinguish and the relay de-energises. The time delay is not active when resetting. Under-Voltage Models When the monitored voltage falls below the set point, the time delay is started. When the time has elapsed, the relay will de-energise and the red LED will extinguish to indicate the trip condition. The relay will automatically reset once the monitored voltage rises above the set point plus the differential. When reset, the LED will illuminate and the relay energises. The time delay is not active when resetting. Options 250 series protector relays offer various customised options to suit individual requirements. Please consult factory. Adjustment ranges different adjustment ranges are possible for the set point and time delay controls. Differential internally fixed value between 1% and 15%. Relay operation standard models are fail safe, but the relays can be customised to energise or de-energise on trip. Product Codes Relay Protection ANSI no. Cat. no. DC voltage Under-voltage external PDU time delay DC voltage Under-voltage differential PDE DC voltage Over-voltage external PDO time delay DC voltage Over and under-voltage 27/ PDC external time delay Please specify system voltage, frequency and required options at time of ordering. 20
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