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System Configuration
High leakage impedance transformer
The main part of CSR system is a step-down transformer with high leakage impedance rate over 90%. The primary winding is connected to grid in parallel. The transformer changes high voltage to low voltage in order to protect the devices in controllable part.
Supplementary reactor
The supplementary reactor usually adopts air-core reactors which are stable and have good linear performance. The air-core reactor is used to absorb the reactive power. Usually several air-core reactors are linked in series and connected with secondary winding of high leakage impedance transformer.
Bypass breaker
Bypass breakers are a controllable part in CSR system. It operates when CSR starts to change level. All breakers act in sequence according to a certain control and protection strategy.
Thyristor valve
Thyristor valves are the other controllable part in the CSR system. The valve is connected in parallel with bypass breaker and cooperates with bypass breaker. It turns on once
Energy-gaining reactor
In order to energize the Thyristor Control Unit (TCU) installed in thyristor valves, each bypass breaker is connected with an energy-gaining reactor in series. Thus the voltage on thyristor valves will be sufficient even when the bypass breaker in parallel is closed.
Grounding reactor
When the CSR is applied to transmission line, a grounding reactor is installed at the neutral point of the primary side of high leakage impedance transformer. The reactor with appropriate reactance value, cooperating with correct action of controllable shunt reactor, can offset capacitive secondary arc current generated in line faults. This helps increase the success rate of reclosing.
Control and protection system
The CSR control system is composed of operator workstation, LAN and printers. It realizes CSR remote control, monitoring and event alarm functions from the control room.
