Dongguan Shun Yu Paper Industry Co., Ltd.

Status Analysis:

1. The main electric equipment in the field is pulping and papermaking machine, sewage treatment system, alkali recovery equipment, Thermoelectric equipment and so on. The driving equipment is the frequency converter and the motor.

2. The harmonic current is mainly harmonic current with 5 and 7 times, and the total harmonic current distortion rate is about 25%.

3, the original capacitor compensation cabinet used the old static reactive power compensation mode, such as controller, AC contactor (capacitor switching device), capacitor and so on. When compensating reactive power, the phenomenon of over compensation and under repair often appears. Due to the capacitor compensation is used in static compensation, when the container is cast electric contactor switched capacitor (large inrush current), fuse and capacitor capacitor is often damaged, resulting in reactive power compensation under compensation problems, ultimately caused by low power factor and power supply department fined economic losses. At the same time, because of the reactive power compensation is not timely, it will cause the transformer voltage instability, reduce the use of transformer and increase the temperature rise and loss of electric energy.

Governance measures:

      According to our experience of 44 years of mature technology, 400kvar capacitor compensation cabinet all changes to the dynamic reactive power compensation, capacitor configuration of dynamic reactive power compensation controller, dynamic compensation regulator (switch), tunable filtering reactor, capacitors and other key parts.

The effect of Governance:

       After rectification, 44 dynamic reactive power compensation cabinets have been operated since 2013. The voltage of transformers and power grid is stable, the total distortion rate of harmonic current is reduced from 25% to 15%, and the power factor is kept at 0.98, meanwhile, the power supply department's economic reward is also obtained.