Protection Relay with Hardwired Interlocking for Full Automatic Change-over and Momentary Paralleling of Multi-incomer

3 stages earth fault 50N/51N Protection relay
Overcurrent inverse time-limit protection
Undervoltage protection Relay
SAC PSL691U relay
High power contact load
Overcurrent inverse time-limit protection
Undervoltage protection
motor protection relay
high power protection relay
miniature size relay
100a rated current relay
dc power source relay

Measurement and Control device PS690U series of protection by the line protection, transformer protection, capacitor

protection, reactor protection, standby power from the cast, composed of motor protection, can be used for 110kV and below voltage levels of various industrial and mining enterprises and power industry. By using a high-performance CPU to integrate protection, measurement and control, and communication functions, it is suitable for substation integrated automatic systems or new energy power plant electrical automation systems.

Main protection function:

* 3-stage composite voltage overcurrent protection

* 3-stage directional zero-sequence overcurrent protection

* Overload protection

* 3-phase Autoreclosing

* Manual closing synchro-check

* Closing Post-acceleration protection

* Low frequency load shedding

* Undervoltage load shedding

* Lower current ground wire selection

* I，U，P，Q，Cosφ，kWh，kVarh，15-channel DI

* B code time-check and NTP time-check