DIFFERENTIAL TRANSFORMER RELAY MODULE

DIFFERENTIAL TRANSFORMER RELAY MODULE
DIFFERENTIAL TRANSFORMER RELAY MODULE equipment:  three-phase percentage biased differential and Restricted Earth Fault protection relay for 2 winding transformers or 3 winding with only one source of supply. Two phase over current plus earth fault relay with programmable time current curves suitable for protection of HV & MV transmission and distribution systems.
The real time measurements of the primary values of the input quantities must be continuously available on the relay's display as well as via the serial communication bus from the MSCom interface program
Setting of the relay can be done either through Front face Keyboard or via serial communication bus from MSCom interface program. Control of the associated circuit breaker can be done either from the relay keyboard or via serial communication bus from MSCom interface program. Settings, events and oscillographic recordings are stored in a non-volatile 2 memory (E PROM). Any internal fault detected must be indicated by a fault message on the display and by de-energization of R5 relay.
Measurements
• dA,dB,dC : Differential current
• IA,IB,IC : Current
• 2H,5H : 2nd & 5th Harmonic detection current
• Io : Neutral current
• Event Recording (last 100 events)
• Trip Recording (last 10 trips with date & time)
Control
• 2 Setting programs
• 6 Output Relays
• 4 Digital Inputs
• Local push-buttons for C/B control
• 1 RS232 Serial communication port on front face, Electrical Power Engineering Laboratory