NEUTRAL UNBALANCE CURRENT RELAY JRC 122

OVERVIEW

    Features

  • Software based design
  • Instantaneous/Definite time
  • Insensitive to harmonics
  • Wide setting ranges
  • Trip test facility

Application:

Neutral unbalance current protection of double star capacitor banks with floating neutral.

NEUTRAL UNBALANCE CURRENT RELAY JRC 122

Principle of Operation:

The sensing current is converted to voltage by an internal resistor and this voltage is fed to a harmonic network which is tuned to the fundamental frequency. The output of filter is fed to a 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.

 

SPECIFICATIONS

Ratings:

Current rating ( In )

:

1A / 5A

Aux. Supply

 

:

1) 20 to 60V DC
2) 75V to 150V AC/DC
3) 175 to 300V DC
185 to 250V AC

     

Settings:

Setting range

 

:

 

2.5% to 80% of rated current
in steps of 2.5%.

Instantaneous

:

Less than 40 milli

Definite time

:

0 to 25 seconds adjustable in steps of
0.1 second.

Rejection ratio of 3rd
harmonic to fundamental
frequency

:

25 : 1.The relay will not operate at third
harmonic currents up to 25 times the settings

     

Burden:

Current input

:

0.2VA at Rated 5A
0.05VA at Rated 1A

Aux. Supply

:

Less than 3W (Non Operated)
Less than 5W (Operated)

     

Accuracy:

Operating value

:

±5%

Operating Time

:

± 5% or ±20ms

Instantaneous time

:

Less than 40ms

 

Contact Ratings:

Relay rating

:

10A at 24V DC/230V AC

     

Contact Durability:

Unloaded contact

:

1,000,000 Operations

Loaded contact

:

100,000 Operations

     

Insulation:

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

Mechanical Design:

Weight

:

2000 gms. (approx)

Case Size

:

144sq mm, depth 232mm

Installation

:

Flush mounting

Panel cutout

:

138mm x 138mm

 

Standard Compliance:

Accuracy test

:

IEC 60255-3

Insulation test

:

IEC 60255-5

     
 

NEUTRAL UNBALANCE CURRENT RELAY JRC 122

 

DOWNLOADS

NEUTRAL UNBALANCE CURRENT RELAY JRC 122

Catalogues:

DOWNLOAD

Operating Manual:

DOWNLOAD

 

NEUTRAL UNBALANCE CURRENT RELAY JRC 122

 

ORDERING INFO.

Ordering Information:

Relay type

:

JRC 122

Current rating

:

1A / 5A

Auxiliary Supply

:

20 to 60V DC

 

:

75 to 175V AC / DC

 

:

175 to 300V DC
185 to 250V AC

 

 

 

 

NEUTRAL UNBALANCE CURRENT RELAY JRC 122

 

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