Inverse Time Current Relay JRC 068

Additional Details

The relay measures the line current from each of the phases and if it exceeds the set threshold, then the relay extends a trip signal after an operating time. The relay's operating time is determined by selecting one of the four inverse time characteristics. The relay has facility to active / inhibit the high set protection feature. The relay output contacts are self reset / Hand reset type. Relay operation without any fault current can be test facility.

Features:

Software based design

Programmable time current characteristics

Choice of four curves

Wide setting ranges

Draw - out case

Application:

The relay provides time graded phase and earth fault protection of Generators, Transformers, Feeder, capacitors etc.,

Settings:

Operating characteristics:

1) 3.0s Normal Inverse

2) 1.3s Normal Inverse

3) 1.5s Very Inverse

4) 0.8s Extremely Inverse

5) 0.6s Extremely Inverse

Phase O/c (IDMT): 50 to 200% in steps of 10% or 20 to 140% in steps of 10%

Earth fault (IDMT): 5 to 80% in steps of 5%

TMS: 0.1 to 1.0 in steps of 0.01 (separate for O/c & E/F)

Phase Hi-set : 200 to 3200% in steps of 200%

Earth fault Hi-set: 50 to 800% in steps of 50%

Burden:

Current input :

0.2VA per phase (rated 5A)

0.05VA per phase (rated 1A)

Aux. Supply:

Less than 8W (Non operated)

Less than 10W (Operated)

Ratings:

Aux. Supply :

1) 20 to 60V DC

2) 75 to 175V AC / DC

3) 175 to 300V DC

    185 to 250V AC