Protector trip relay - Crompton Instruments - 250 Series - AC Voltage with Adjustable Differential

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Protector trip relay - Crompton Instruments - 250 Series - AC Voltage with Adjustable Differential

 

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 75-100%	27	252-PVU
1-phase	Over-voltage 100-125%	59	252-PVO
1-phase	Under and over-voltage	27/59	253-PVB
3-phase 3-wire	Under-voltage 75-100%	27	252-PVK
3-phase 3-wire	Over-voltage 100-125%	59	252-PVA
3-phase 3-wire	Under and over-voltage 27/59	27/59	253-PVM
3-phase 4-wire	Under-voltage 75-100%	27	252-PVV
3-phase 4-wire	Over-voltage 100-125%	59	252-PVP
3-phase 4-wire	Under and over-voltage 27/59	27/59	253-PVE

Please specify system voltage, frequency and required options at time of ordering.


Hình Model 252



Hình Model 253


 

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	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.

 

Dimensions

Model 252
Hình: Kích thước Model 252



Model 253

Hình: Model 253

 

Connections

252-PVU; 252-PVO; 252-PVV; 252-PVP; 252-PVK; 252-PVA




253-PVB


Hình: Connection 253-PVB


253-PVM
253-PVM


Hình: 253-PVM


Note: The neutral connection is always used on four-wire systems.

 

Danh mục sản phẩm

System	Protection	Catalog Number
AC Voltage (Adjustable hysteresis 1-15%)
Single Phase L-N	Under Voltage 75-100%	252-PVUU-PQBX-C6-EB
	Over Voltage 100-125%	252-PVOU-PQBX-C6-EA
	Over and Under Voltage	253-PVBU-PQBX-C6-EC
3 Phase, 3 Wire L-L	Under Voltage 75-100%	252-PVKU-PQBX-C6-EB
	Over Voltage 100-12%	252-PVAU-PQBX-C6-EA
	Over and Under Voltage	253-PVMU-PQBX-C6-EC
3 Phase, 4 Wire L-N	Under Voltage 75-100%	252-PVVU-PQBX-C6-EB
	Over Voltage 100-12%	252-PVPU-PQBX-C6-EA
	Over and Under Voltage	253-PVEU-PQBX-C6-EC