GGJ Type Low-voltage Reactive Power Dynamic Compensation control Equipments

Overview

Transmission and distribution system is the sine wave voltage and current waveform of the fixed frequency. When the nonlinear load is like the thyristor rectifier, the frequency converter will generate a large amount of harmonic current,causing the voltage and current distortion.

Capacitor and power grid can form a parallel resonant circuit, and the harmonic current amplification to 20 times as the normal. The resonant frequency of the parallel resonant circuit is close to the harmonic frequency in the power network.
The harmonic current will cause the further voltage distortion, which is why power grid affected by harmonics can not be used for power factor compensation by the conventional capacitor.

When the power grid is in the presence of harmonics, the tuning filter should be used to compensate the power factor, A tuned filter, which is composed of capacitors and reactors in series. can compensate for inactivity without amplification.

Product Standards &Technical Requirement

GB/T 15576-2008

Power factor compensation in the presence of harmonics

The tuned filter design used to the grid which generate harmonics for power factor compensation

Each section of the tuned filter is composed of a reactor and capacitor in series, and a series of resonant circuit is formed by the capacitor and reactor, and the resonance frequency is 5 times of the lowest harmonic in the power network.(250Hz)

The tuning frequency of the resonant circuit, such as the fundamental frequency, is capacitive, for the power grid, the reactive power is higher than the tuning frequency of the filter is an electric sensibility, This means that no other including 5 times, 7 times and 11 times of the ordinary harmonic will be amplified, and the filter can also absorb a part of Low order harmonic in the power grid.

Different from the conventional capacitor group, each tuned filter is controlled by an automatic power factor regulator according to the need of no power

Technical parameter

Rated current: In=569A~82A
System voltage: AC380/AC400V
Rated capacity: 87.5~450kvar/cabinet
Resonant frequency: 141Hz and 189Hz, other frequency which to
Provided based on the need s(such as 204Hz)
Installation site: In the house
Temperature range: the lowest -5℃ , the highest +40℃ ,
24 hours average maximum +35℃ , annual average +25℃
Degree of protection: IP30
1. Power-factor regulator
2. Fuse protector
3. Contactor
4. Reactor;
5. Capacitor
6. Air filter