1 Year Warranty
Description
概观
Essential details：REJ603 Self-Powered Feeder Protection
REJ603 relay is intended to be used for the selective short-circuit and earth-fault protection of feeders in secondary distribution networks and for protection of transformers in utilities and industies. The relay is a self-powered Numerical relay, which does not requires external auxiliary supply voltage, making it an ideal choice for installation even in remote locations where auxiliary supplies are not available. The relay derives power for its operation from the current transformers.
REJ603 is primarily used in Ring Main Units ( RMU ) within distribution network.
Relay provides earth current measurement through internal calculation or has the provision for measuring it from the external core balance current transformer (CBCT).
Self-powered three phase non-directional overcurrent and earth-fault protection with DMT and IDMT characteristics
Dual mode of earth fault measurement – internal vector summation or external
CBCT input
Integrated IDMT curves (IEC and Special) in a single product to cover time coordination needs of secondary distribution protection
Protection blocking by second harmonic measurement for stability during
magnetizing inrush of transformers
Capacitor discharge impulse output for low energy trip coil
Built-in hand-reset electromechanical Flag for trip indication
Easy setting by DIP switches, protected by a transparent cover
Compact design and mounting arrangement suitable for Ring Main Unit (RMU)
applications
Test facility for testing entire scheme including primary CT, relay, and trip coil
REJ603
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sunny He
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REJ603Â Self-Powered Feeder Protection
The combined overcurrent and earth-fault relay is a secondary relay to be connected to the current transformers of the protected object. Apart from the measurement (inputs), the relay derives energy required for its own operation and tripping of circuit breaker from the current transformers. There are two LED’s on the front panel. When minimum current required for operation is available the green ‘Ready’ LED glows indicating the relay is in operation. On detection of a fault the relay trips the circuit breaker in accordance with the settings. The relay also does internal health check at regular interval and intimates user in case of any internal relay failure. The internal relay failure is indicated by red ‘IRF’ LED. .
When the phase current exceeds the set operate time at definite time operation or the calculated operate time at inverse time operation elapses, the overcurrent unit operates. In the same way the high-set stage I>> of the overcurrent unit operates when the set operate time elapses.
When the earth-fault current exceeds the set operate time at definite time operation or the calculated operate time at inverse time operation elapses, the earth-fault unit operates. In the same way the high-set stage I0>> of the earth-fault unit operates when the set operate time elapses.
