NEUTRAL EARTHING RESISTOR MONITORING RELAY JRV 402

OVERVIEW

    Features

  • Solid state reliability
  • Built in Trip test facility
  • High sensitivity
  • Low burden

Application:

The relay is used to monitor the neutral earthing resistor.Transformer neutral is earthed through a resistance. This resistor is called as Neutral Earthing Resistor (NER). Neutral Earthing resistors are used to restrict the fault current through the transformer during earth fault conditions. The healthiness of NER is important as an open resistor would render earth leakage protection in operative and hazardous.

NEUTRAL EARTHING RESISTOR MONITORING RELAY JRV 402

Principle of Operation:

A very low DC current is passed through the NER and this is monitored in the relay. If there is an open circuit in resistor or considerable change in the resistor value the same is detected in the monitoring circuit. After detecting the change, timer is shorted and output relay is deenergized at the end of internally set time delay ( 5 Sec ) The relay contact may be connected externally to Alarm/Trip circuit as required. Normally the output relay is kept energized. If there is a failure in Aux. Supply the output relay releases and extends the Alarm/Trip signal.

 

SPECIFICATIONS

Ratings:

Auxiliary supply

:

230V, ±10%, 50Hz

     

Burden:

Aux. Supply

:

Less than 5VA

     

Output Relay

Relay

:

Two Changeover

Relay ratings

:

5A at 24V DC/230V AC, 50Hz.

Working voltage of the system for which relay is designed

:

565V, 3, 50Hz, with neutral
resistance of435 ohms.

Tripping Level

:

Resistance more than 150% of 435
ohms i.e., more than 653 ohms.

     

Contact Durability:

Loaded contact

:

10,000 operations min.

Unloaded contact

:

100,000 operations min.

     

Insulation:

  1. 2KV RMS, 50 Hz for 1 minute / 2.5 KV for 1 sec Between all terminals and cases .
  2. 1KV RMS, 50 Hz for 1 minute across open contacts
     

Mechanical Design:

Weight

:

1000gms. (approx

Case Size Fascia
Installation

:
:

83 x 148sq mm, depth 104mm
Flush mounting

Panel cutout

:

73mm x 138mm

     
 

Contact Ratings:

Output contacts

:

10A at 24V DC / 230V AC

     
 

Standard Compliance:

Accuracy test

:

IEC 60255-3

Insulation test

:

IEC 60255-5

     
 

NEUTRAL EARTHING RESISTOR MONITORING RELAY JRV 402

 

DOWNLOADS

NEUTRAL EARTHING RESISTOR MONITORING RELAYJRV 402

Catalogues:

DOWNLOAD

Operating Manual:

DOWNLOAD

 

NEUTRAL EARTHING RESISTOR MONITORING RELAY JRV 402

 

ORDERING INFO.

Ordering Information:

Relay type

:

JRV 402

Aux. Supply

:

230V AC 50Hz

 

 

 

 

NEUTRAL EARTHING RESISTOR MONITORING RELAY JRV 402

 

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