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PCS-9400 Generator Excitation System
  • The PCS-9400 generator excitation system can improve generator performance and reduce maintenance costs. It provides complete control functions, including power system stabilizer, optimum control, adaptive control and other functions. The PCS-9400 can be customized with a wide range of options to accommodate various specifications from customers.

    The range of rated currents is 100A to 7000A and the range o voltages is 100V to 700V. The PCS-9400 system is available fo various excitation types, including:

    • Stationary excitation system

    • One-generator and one-excitation system

    • One-generator and two-excitation system

    • Brush-less excitation system

    • DC exciter excitation system

  • Funcitons Features System Configuration
    • Maintain the terminal voltage at a given value by adjusting the strength of the magnetic field when the generator loads changes.

    • Reasonably distributing the reactive power between the generator units in parallel.

    • Improve the stability of power system, including static stability, transient stability and dynamic stability.

    • Do de-excitation to reduce the extent of the damage in case of internal fault of generator.

    • Perform the maximum excitation limit and the minimum excitation limit for the generator according to operational requirements.


    • The Automatic Voltage Regulator (AVR) uses high-performance CPU as the core hardware, and adopts high precise multi-point AC sampling technology, and all the control, regulation, protection function are realized by the module designed software.

    • Rectifier cabinet can withstand high capacity, with air wind cooling system.

    • A lot of elements and protections are supplied for complete control function of excitation system.

    • Parallel-connected dual-cabinet operational mode without switchover process has more reliability.

    • Trending and recording data are provided. The user can record the data one second before fault. The system measures AC current and voltage of generator, active power, reactive power and power factor, etc.

    • The user can configure and troubleshoot the PCS-9400 via the communication network. 

    NR’s excitation system consists of numerical excitation regulator, thyristor rectifier, diode valve rectifier, de-excitation equipment and auxiliary cabinets. According to the different requirements of each excitation mode, the above equipments can be flexibly tailored to combine the compatible solution.

    • PCS-941X Digital Excitation Regulator

    It consists of dual-channel configuration or three-channel configuration. Each channel is an independent regulation unit based on advanced hardware platform, which is based on multi-processor system including PowerPC, DSP and FPGA. The system provides all essential functions, such as PID regulation+ PSS strategy, many closed-loop and open-loop control laws, difference regulation, many limiters and protections, i.e. under-excitation limiter, over-excitation limiter, false strong excitation limiter, peak current limiter, V/F limiter, overvoltage protection on no-load, TV signal failure protection etc. And self-diagnose function, fault-tolerance control element, oscilloscope and event recording function are all equipped with. The HMI with a LCD and a 9-button keypad is friendly to users. And it is also easy to communicate with PC at higher level. Ethernet interface, optical fiber interface and RS-232/RS-485 serial ports are supplied for communication.

    • PCS-9420 Thyristor Rectifier

    A lot of levels of current output are supplied to match the requirements of users, i.e. 250A, 800A, 1200A, 1800A, 2400A and 3000A. Parallel-connected multi-cabinet operational mode is adopted. The coefficient of equalizing current is larger than 0.9. Aluminum Radiator or Heat Pipe Radiator can be selected alternatively.

    • PCS-9421 Diode Rectifier

    A lot of levels of current output are supplied to match the requirements of users, i.e. 1800A, 2400A and 3000A. Parallel-connected multi-cabinet operational mode is adopted. The coefficient of equalizing current is larger than 0.9. Aluminum Radiator or Heat Pipe Radiator can be selected alternatively.

    • PCS-943X De-excitation Equipment

    Linear or nonlinear resistor and magnetic blow-out switch are supplied in de-excitation equipment. And overvoltage protection is also equipped with.

    • PCS-944X Auxiliary Equipment

    Special devices for complicated requirements and logic circuits are equipped with the cabinet.

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