The PCS-9655 high speed transfer device is used in power plants to ensure the continuous and reliable power supply for busbars.
In normal operation, the power supply of busbar is provided by the main power supply branch, and the standby power supply is ready for switching. If the circuit breaker CB3 is closed, the standby power supply is in hot standby state; if the circuit breaker CB3 is opened, the standby power supply is in cold standby state.
If the main power supply has fault, the PCS-9655 will trip circuit breaker “CB1”, and the voltage of busbar is lost. Due to the mechanical inertia of motor load of busbar, the composite feedback voltage of busbar is decaying gradually. In this procedure, if the standby power supply is put into service at an improper moment, the voltage difference between busbar residual voltage and standby power supply voltage will have a greater impact on other equipment in the power plant. Then the switching operation is failed, and the busbar voltage is absolutely lost.
The PCS-9655 high speed transfer device can select the optimal moment for switching the standby power supply into service to ensure the safety and reliability of switching operation.
Normal manual switching function
Accident switching function
Loss-of-busbar-voltage switching function
Circuit breaker unexpected tripping switching function
Undervoltage load shedding switching function
Switch-onto fault protection
Voltage and current drift auto adjustment
Voltage transformer supervision
Circuit breaker status monitoring
Circuit breaker control
64 Fault records and 64 Disturbance records
1024 SOE records, latest records of following elements state changing: operating abnormality alarm elements, selfcheck alarm elements, protection elements and binary input elements.