generator backup protection relay is applicable to the generator protection that the water turbine capacity whose power is not more than 10MW, the turbine generator capacity whose power dose not exceed 100MW ,The protection device has the specialized protective function of the generator sets of compound voltage lockout over current protection, negative sequence over current protection, field loss protection, reverse power protection, stator earthing protection and so on,formed a complete protection of the generator together with the 9698 (differential protection of the generator) and the 9689 (generator ground protection) .
The protective function of the generator backup protection relay
Combined voltage blocking over current protection,
Negative sequence over-current protection,
over load
Zero sequence over-current
Over-voltage
low voltage
Over frequency
Low frequency
reverse-power protection
loss of field protection
stator ground fault protection
PT line-break alarm
CT line-break alarm
Measurement and control function
busbar voltage ：Uab、Ubc、Uca；Ua、Ub、Uc；
Measuring current：Ia、 Ib、 Ic、
power：P、Q、cosФ；
frequency：f；
Auxiliary function
Control loop break;
Manual separating brake and switch in
Remote control separating brake and switch in
Fault recording
Communication mode
The 485 communication
Ethernet communication
Optical fiber communication
Protective principle
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