Automatic transfer switch PCS-9655

manualbusbarremotely operated

Product overview
The PCS-9655 high-speed transfer device is designed for power plants to maintain continuous and reliable busbar power supply. It manages automatic and manual transfer between the main and standby power branches, optimizing the switching instant to match busbar residual voltage and standby supply voltage and avoid unsuccessful transfers.

Operation modes
In normal operation the main branch supplies the busbar while the standby branch remains ready. When circuit breaker CB3 is closed the standby supply is in hot standby; when CB3 is open it is in cold standby. If the main supply fails and CB1 trips, the PCS-9655 monitors the busbar voltage decay (influenced by motor inertia) and initiates transfer at the optimal moment to prevent voltage mismatch and loss of the busbar.

Protection and control functions

• Normal manual switching
• Accident/emergency switching
• Loss-of-busbar-voltage switching
• Unexpected circuit-breaker tripping switching
• Undervoltage load-shedding switching
• Switch-on-to-fault protection
• Automatic voltage and current drift compensation
• Self-supervision and diagnostics
• Voltage transformer supervision

Monitoring, records and control

• Circuit-breaker status monitoring and remote control
• 64 fault records and 64 disturbance records
• 1024 SOE records; recent records include element state changes for operational alarms, self-check alarms, protection elements and binary inputs

Catalog
Catalog (PDF) available for the PCS-9655 High-speed Transfer Device.

Technical specifications

• Application: high-speed transfer for busbar power continuity in power plants
• Standby modes: hot standby (CB3 closed) and cold standby (CB3 open)
• Automatic selection of optimal switching instant to match busbar residual voltage and standby supply voltage
• Protection: switch-on-to-fault, undervoltage load shedding, accident switching, loss-of-busbar-voltage switching, unexpected circuit-breaker tripping switching
• Control and supervision: circuit-breaker control and status monitoring, VT supervision, self-supervision
• Compensation: automatic voltage and current drift adjustment
• Event recording: 64 fault records, 64 disturbance records, 1024 SOE records (including operational alarms, self-check alarms, protection and binary input state changes)