Earth fault relay - JRC 951/962

Features

  • Software based design
  • DIP switch settings
  • Wide setting range
  • Choice four curves
  • Instantaneous high set
  • Very low burden

Application:

Time graded protection of generators, Transformers, capacitors etc;



 






ACCURACY:

Operating value         : 105 to 120% of set current
Resetting value : 80 to 97% of the pickup value
High set operating value : ±5%
Inverse operating time : ±5% or ± 30ms (which ever is higher)
High set operating time  : < 40ms @ 2 times the set current
Over shoot time : 200 to 250ms
Over shoot time : Less than 100ms

RATINGS:

Current rating : 1A / 5A
Auxiliary Supply : 20 to 60V DC
  : 80 to 260V AC/DC

CONTACT RATINGS:

For JRC 951P, JRC 952,  : Trip – 10A at 24V DC/ 230V AC
JRC 962P, JRC 964 relays  : Alarm – 5A at 24V DC/ 230V AC

OUTPUT CONTACTS:

For JRC 951, JRC 952 : Trip – 1N/O
JRC 962P, JRC 964 relays, : Alarm – 2N/O 

MECHANICAL DESIGN :

Weight : 550gms approx.
Case Size : 96sqmm, Depth 105mm
Installation : Flush mounting
Panel cutout : 92mm x 92mm

CURRENT SETTING (INVERSE TIME):

Earth fault : 5 to 42.5% in steps of 2.5%
    or 5 to 80% in steps of 5% (to be specified)
Instantsneous high set :  2 to 16 times 1> set value

OPERATING CHARACTERISTICS :

Inverse time Characteristics :  3s Normal inverse
  : 1.3s Normal inverse
  : 1.5s Very inverse
  : 0.8/0.6s Extremely inverse

OPERATING CHARACTERISTICS :

Time multiplier setting (TMS) :  0.01 to 1.6 in two ranges
  : 1st range : 0.01to 0.32 in steps of 0.01
  : 2nd range : 0.05 to 1.6 in steps of 0.05

OVER LOAD RATING:

   
Current input    : 2 times the rated continuously
  : 20 times the rated for 3s

BURDEN :

Auxiliary circuit   : 3W (Non-operated)
  : 6W ( Operated)
Current input circuit      : 1A – 0.05 VA (max) at rated current
  : 5A – 0.2 VA (max) at rated current

ORDERING INFORMATION :

Current rating    : 1A or 5A
Curve selection    : 0.8 or 0.6s Extremely inverse
Relay type      : JRC 962 ( With High set)
  : JRC 951 ( Without High set)
Auxiliary Supply  : 20 to 60V DC or 80 to 260V AC/DC