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Single pole definite time earth fault relay - JRC 012
Features
- Software based design
- Wide setting range
- Wide auxiliary supply
- Low burden
Application:
The relay provides earth fault protection of Generators, Motors, Transformers, Feeder etc., and where definite time protection is required.
Principle of Operation:
The relay provides earth fault protection for power systems. Relay operating time is determined by set definite time. The relay measures the current from input CT and if it exceeds the set threshold, it extends a trip signal after the operating time, which is determined by set definite time. The relay output contacts are self reset type. TEST button facilitates testing of relay contacts for trip and alarm circuits.
ACCURACY:
| Operating value |
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± 5% |
| Operating Time |
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± 5% or ±20ms |
| Instantaneous time |
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Less than 40ms |
RATINGS:
| Current rating |
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1A / 5A |
| Auxiliary Supply |
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20 to 60V DC |
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75 to 175V AC / DC |
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175 to 300V DC |
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185 to 250V AC |
CONTACT RATINGS:
| Relay rating |
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10A at 24V DC/230V AC |
CONTACT DURABILITY :
| Loaded contact |
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1,000,000 Operations |
| Unloaded contact |
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100,000 Operations |
INSULATION:
| 1. 2KV RMS, 50 Hz for 1 minute / 2.5 KV for 1 sec . Between all terminals and cases . |
| 2. 1 KV RMS, 50 Hz for 1 minute across open contact |
MECHANICAL DESIGN :
| Weight |
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2000 gms. (approx) |
| Case Size |
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144sq mm, depth 232mm |
| Installation |
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Flush mounting |
| Panel cutout |
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138mm x 138mm |
STANDARD COMPLIANCE:
| Accuracy test |
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IEC 60255-3 |
| Insulation test |
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IEC 60255-5 |
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SETTINGS:
| Earth fault setting |
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5 to 80% in steps of 5 % |
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| Definite time setting |
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0 to 25s in steps of 0.1s |
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OVER LOAD RATING: |
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| Current input |
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2 times Rated continuous |
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20 times Rated for 3s |
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40 times Rated for 1s |
BURDEN :
| Current input |
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0.2VA at Rated 5A |
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0.05VA at Rated 1A |
| Aux. Supply |
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Less than 3W (Non Operated) |
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Less than 5W (Operated) |
ORDERING INFORMATION :
| Relay |
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JNF 020 |
| Voltage rating |
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110V AC |
| Aux. Supply |
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1) 20 to 60V DC |
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2) 75 to 150V AC / DC |
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3) 175 to 300V DC/185 to 250V AC |
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