Restricted Earth fault Relay JRD 013

OVERVIEW

    Features

  • Software based design
  • Very sensitive and wide setting range
  • Insensitive to currents at harmonic frequencies
  • Trip test facility

Application:

Restricted earth fault protection of transformers, generators and motors differential protection of bus bars, motors and generators.

RESTRICTED EARTH FAULT RELAY JRD 013

Principle of Operation:

The Relays JRD 011 & JRD 013 are current operated Microprocessor based, differential relays which work on the high impedance principle. An external series stabilizing resistor is used with this relay to make it a voltage operated relay. The voltage setting of the relay is adjusted to be higher than that developed by the current transformers used for maximum external fault conditions. JRD 011 is a single pole relay where as JRD 013 is a triple pole relay.

The sensing current is converted to voltage by an internal resistor and this voltage is fed to a harmonic network which is tuned to fundamental frequency. The output of filter is fed to voltage comparator. When the sensing current signal at the fundamental frequency exceeds the set value,the comparator gates a train of pulses to the processor. The program residing in the CPU performs the function of control and also gives output signals for relay and LED driver circuits. The operation of the relay is indicated by the glowing of a 'Red' LED,which has to be reset manually by means of a 'RESET' push button provided on the front of the relay. A 'Trip Test' push button is also provided in the relay to enable testing of the trip and alarm circuits. When this push button is pressed, the output element of the relay is energized and its contacts close to energize the trip and alarm circuits.

The relay will not operated at third harmonic currents upto 25 times the setting.

 

SPECIFICATIONS

Ratings:

Current rating ( In )

:

1A / 5A

Aux. Supply

 

:

20 to 60V DC
75 to 150V DC / AC
175 to 300V DC / 185 to 250V AC

     

Settings:

Operating value

:

2.5 to 80% of in steps of 2.5%

     

Impedance:

1A rated

:

200milli Ohms

5A rated

:

20milli Ohms

     

External Stabilizing Resistor:

1A rated

:

0 – 600Ώ 100W adjustable

5A rated

:

0 – 100Ώ 100W adjustable

     

Over Load Ratings:

Current input

:

2 times Rated continuous
20 times Rated for 3s.

     

Burden:

Current input

:

Less than 0.2VA at rated 1A
Less than 0.5VA at rated 5A

Auxiliary Supply

:

Less than 3W (Non operated)
Less than 6W (Operated)

     

Accuracy:

Operating value

:

± 5%

Operating time

:

± 5% or ± 30ms

     

Contact Rating:

Contact 1 & 2

:

10A at 24V DC / 230V AC

 

 

 

Contact Durability:

Unloaded contact

:

1,000,000 Operations

Loaded contact

:

100,000 Operations

 

 

 

 
 
 
 
 

Mechanical Design:

Weight

:

App. 1.5kg

Case Size

:

144 sq. mm

Installation

:

Flush mounting

Panel cutout

:

138mm x138 mm

 

Standard Compliance:

Accuracy Test

:

IEC 60255-3

Insulation Test

:

IEC 60255-5

     

Terminal Diagram:

JRD 011

 

JRD 013

 

RESTRICTED EARTH FAULT RELAY JRD 013

DOWNLOADS

RESTRICTED EARTH FAULT RELAY JRD013

Catalogues:

DOWNLOAD

Operating Manual:

DOWNLOAD

 

RESTRICTED EARTH FAULT RELAY JRD 013

 

ORDERING INFO.

Ordering Information:

Current rating

:

1A / 5A

Relay type

:

JRD 011 (One pole)
JRD 013 (Three pole)

Auxiliary Supply

:
:
:

20 to 60V DC
75 to 150V DC/AC
175 to 300V DC / 185 to 250V AC

 

RESTRICTED EARTH FAULT RELAY JRD 013

 

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