PFMAX-MV
DYNAMIC POWER FACTOR WITH VACUUM CIRCUIT BREAKER


PFMax-MV Series voltage reactive power compensation device, is suitable for substation, distribution station of 220kV and below or three phase AC electric system without main transformer of 35kV and below, through the automatic regulation of transformer on-load voltage regulating tap and switch of capacitor bank on bus to realize the control to substation voltage and reactive power.

This device includes:earthing isolator, high voltage vacuum contractor (breaker), high voltage parallel capacitor, fuse protecting parallel capacitor, series reactor, earth switch, discharge coil, arrestor, voltage reactive power integrated controller, capacitor bank microcomputer protection unit (protector), cabinet and auxiliary parts such as primary and secondary wire.
 
Functions and Features
  1. Fixed compensation
  2. Manual compensation
    • Has HTC series capacitor bank microcomputer protection unit, can realize the protection to secondary over-current of each capacitor and zero sequence voltage. When one of them has default, can automatically cut off this capacitor and lockout, will not affect the normal switch of the whole set device.
  3. Automatic compensation
    • Has VQC series controller, based on system voltage, reactive power and power factor, automatically switch capacitor banks and control on-load voltage regulation of main transformer, use twelve region graph to control voltage reactive power, achieve the best voltage reactive power control effect.
    • Can divide the capacitors of rated capacity into groups, achieve the best reactive power control effect.
    • HTC series capacitor bank microcomputer protection unit, can realize the protection to secondary over-current of each capacitor and zero sequence voltage. When one of them has default, can automatically cut off this capacitor and lockout, will not affect the normal switch of the whole set device.
    • Has reactors that with different ratio, to limit rush current when switch and suppress high harmonic.
    • Can do closed-loop automatic control to on-load voltage regulation transformer and capacitor banks both integrated and separately, can also manually open-loop control.
    • Through test auxiliary contact signal of superior every breaker switch and bus couple switch, automatically distinguish and adapt to all working mode of substation.
    • Can realize communication through 485 or 232 data communication port based on standard 101 communication protocol, realized remote measuring, remote signaling, remote control, remote regulating “four remote” functions.
    • Can display serious kinds of data, state information, to convenient operating worker to control real-time.
    • Has automatic lockout ability under the abnormal condition, high anti-interference ability, prevent miss operation.
    • When system alarm, will prior to cycle display alarm information, to convenient user to learn the operation condition.
Working principle and typical wiring mode
Reactive power compensation and on-load voltage regulation are up to actual operation condition of each substation. At present, most loads are inductive load, so use the way of compensating capacitor to compensate the phase difference between voltage and current produced by inductive load, to reduce power loss and improve power quality.

PFMax-MV device takes substation voltage signal and current signal as the simulate input signal of reactive power compensation and transformer on-load voltage regulation, and calculate reactive power requirement, power factor, active power, through auxiliary contact signals of each main transformer switch, bus couple switch, to identify serious kinds of operation mode. Use voltage, reactive power twelve region graph control method, according to the basic principle of “guarantee voltage qualified, reactive power basic balance, try to reduce the times of regulation”, calculate the relationship between reactive power and voltage, solved the problem that the regulation of transformer on-load voltage regulation tap is too often. The following drawing is typical wiring mode:
Typical Wiring Mode