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Single Pole Definite Time Earth Fault Relay
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
Technical Data
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Ratings
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Current rating
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1 A / 5A
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Auxiliary Supply
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20 to 60 V DC
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75 to 175 V AC/DC
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175 to 300 V DC
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185 to 250 V AC
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Settings
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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 ratings
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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
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Burden
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Current input
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0.2 VA at rated 5A
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0.05 VA at rated 1A
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Aux . Supply
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Less than 3 W (Non operated)
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Less than 5 W (Operated)
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Accuracy
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Operating value
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+ 5 %
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Operating Time
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+ 5 % or + 20 ms
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Instantaneous time
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Less than 40 ms
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Contact Ratings
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Relay rating
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10 A at 24 V DC/ 230 V AC
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Contacts Durability
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Unloaded contact
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1000000 Operations
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Loaded contact
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100000 Operations
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Insulation
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2 KV RMS, 50 Hz for 1 minute/ 2.5 KV for 1 sec. Between all terminal and cases
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1 KV RMS, 50 Hz for 1 minute across open contact
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Mechanical Design
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Weight
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2000 gms (approx)
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Case size
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144 sq mm, depth 232 mm
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Installation
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Flush mounting
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Panel cutout
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138 mm X 138 mm
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Standard Compliance
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Accuracy test
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IEC 60255-3
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Insulation test
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IEC 60255-5
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Ordering Information
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Current rating
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1 A /5A
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Relay
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JRC 012 (E/F)
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Auxiliary supply
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20 to 60 V DC
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75 to 175 V AC/DC
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175 to 300 V DC
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185 to 250 V AC
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