Self Powered Current Relay

Features

  • No Auxiliary supply
  • Programmable operating characteristics
  • Low burden
  • Wide setting range
  • LED fault flag indication

Application:

• JRC 966Sp provides three pole phase over current protection for distribution feeder and transformer. The relay measures the line current. If it exceeds a threshold value, then the relay extends a trip signal according to the selected characteristics.

• JRC 962Sp Provides earth fault protection for distribution feeder and transformer. The relay measures earth fault current. If it exceeds a threshold value, then the relay extends a trip signal according to the selected characteristics.

• JRD 911SP provides earth fault protection for a star connected transformer. The relay measures fundamental frequency component of current and if it exceeds the set threshold then the relay extends a trip signal instantaneously. The relay is insensitive to switching harmonics.

All the above mentioned relays derives power supply from the line CT’s through IO module and hence does not require any auxiliary supply for it’s operation. Therefore , these relays are ideally suited for all applications where auxiliary supply is not available such as RMU’s and unattended substations.




  Features JRC 966SP (50 & 51) JRC 962SP (5IN) JRD 911SP (64)
Rating Relay current 5A 5A 1A
IO Module Suitable for 5A CT secondary only
Settings Inverse time characteristics

1)3.0s Normal inverse

1)3.0s Normal inverse

 NA

2)1.3s Normal inverse

2)1.3s Normal inverse

3)1.5s Very inverse

3)1.5s Very inverse
4) 0.8s Extremely inverse 4) 0.8s Extremely inverse
TMS 0.01 to 0 1.6  
  (0.01 to 0.32 @ 0.01 and 0.05 to 1.6 @ 0.05) NA
Over current setting 50 to 200% @ 10%

5 to 80% @ 5%

(When minimum load current is 20%)
High set 2 to 6 times the over current settings in steps of 1 NA
Accuracy Operating value 105% to 120% (IDMT)

100% to 105%

(Def.time)
Operating time

Normally±5% or±40ms

(±7% or± 40ms for 0.8s EI & 1.5s VI)

Instantaneous

(Less than 40ms)
High set operating value ± 5% of settings NA
High set operating time Less than 40ms NA
Output contact details Contact rating

30A at 230V AC/ 24V DC maximum voltage 440V AC/DC
  Contact durability

Mechanical:10,000,000 operations minimum

Electrical:100,000 operations minimum
Indications

Trip indications are provided by an LED. LED flag can be hand reset.

Backup power for LEDs can last for 24 Hrs when the battery is fully charged.
Burden Relay input 0.2VA at rated 5A 0.2VA at rated 5A 0.05VA at rated 1A
IO Module Less than 10VA at rated 5A
Over load Current input 2 times rated continuously, 20 times rated for 3s, 40 times rated for 1s.
Instruction Mounting The relays and IO module has to be mounted on the panel with 1mt distance.
Mechanical design Weight App. 550gms.
Case size, type 96mm x 96mm, depth 105mm, Flush mounting
Panel cutout 92mm x 92mm
Standard compliance Accuracy test IEC 60255-3 Performance test
Insulation test IEC 60255-5 Insulation requirement test
1MHz HFD Test IEC 60255-22-1 High frequency disturbance test
Ordering information Relay current rating 5A 5A 1A