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  • PCS-9578 Controllable Shunt Reactor

  • Controllable shunt reactors are used to solve the contradiction between reactive power compensation and over-voltage restraining especially in an extra-high voltage and long distance power transmission system. The stability and economy of power grid operations can be affected by active and reactive power disturbances caused by switching of large loads or other common system faults. The resulted overvoltage may damage the related electrical apparatuses. NR Electric provides PCS-9578 Controllable Shunt Reactor (CSR) system to adjust the reactive power so as to stabilize the line voltage and achieve a reasonable power flow distribution. Furthermore, when applied to transmission line, PCS-9578 CSR can restrain the secondary arc current to improve reclosing success rate.

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  • Professional system design
    • NR Electric takes into account RTDS, analog simulation environment and PSCAD in the design processes to study system stability, active and reactive power distribution and power quality in order to optimize CSR system design.
    • The customized CSR system can analyze system power quality to check injected harmonic current and filter resonance.
    • The optimal regulation modes will be selected based on the installation place to gain the most effective voltage/ reactive power regulation.
  • Thyristor valve
    NR Electric’s CSR valve has many advantages such like compact structure, light weight, less land space and easy installation and maintenance. The valve assembly is completed in factory before shipping to ease on-site installation. Only the electrical connection to reactor and the optic connection to control devices are conducted on site.
  • Electric-optical triggering system
    The electrical triggering system is comprised of two parts: the Valve Control Unit(VCU) in the control room and the Thyristor Control Unit(TCU) in the valve.
    The Control Pulse (CP) is converted to an optic Firing Pulse (FP) by VCU. This optic FP is then converted to an electric FP to trigger the thyristor. The conversion between optic to electric FP is conducted by TCU. If the thyristor is not forward biased or damaged, the control system will issue an alarm or stop operating according to the signal sent from TCU.
    The optic triggering system uses light to trigger thyristor. It integrates forward overvoltage protection components, and thyristor management units are used instead of thyristor control units.
  • Thyristor breaker-over voltage protection
    A thyristor can be damaged by a large forward voltage if there is no current flowing through the thyristor. Thus it is essential to force the thyristor to turn on before the voltage across the thyristor reaches the break-over threshold voltage. The break over diode (BOD) is usually used to protect thyristors from being damaged by forward overvoltage. However, a series connected BOD can cause a large deviation in the break-over voltage threshold. To solve this problem, NR Electric invented the unique circuit integrating thyristor protection valves. It reduces the breakover voltage deviation to a minimum value, so that the breakover voltage can be fixed manually in order to accommodate different types of thyristor.
  • Well-proven protection and control system
    The protection and control of the controllable shunt reactor system uses the same reliable software and hardware platform as the HVDC control and protection system. The highly integrated software platform uses graphic programming and test tools to realize diverse control functions. The universal hardware platform is equipped with multifunctional modular PCB to achieve data acquisition, control and monitoring functions.