Arc Flash Protection System

THT-APS  Arc Flash Protection System

1. 1.      General

Necessity of installations of the APS arc light integrated protection system

In the electrical power system, the following reason may cause short-circuit fault with arc light within the switchgear

• Fault operation of the disconnecting switch

• Switch on with ground connection

• Forget to measure the voltage of the working area

• Device fault or faulty operation of electrified device

• Tools omitted in the switch cabinet after normal device maintenance

• False wiring or bus connecting

• Insulation aging, mechanical deterioration and over voltage

• Environmental factors including dust, temperature, humidity and small animals.

• Product introduction

The THT-APS series arc light integrated protection system is composed by the THT-APS-MU bus protection primary unit, the THT-APS-FU feeder protection unit and so on.

This product is mainly applied to:

Bus protection in the medium and low voltage switchgear of various power stations, transformer substations, distribution substations and box-type substations systems.

Connector in the cable chamber of the feeder cabinet, and breaker cabinet protection;

Rectification cabinet protection;

Other equipment with easy occurrence of arc light, such as high voltage electrical machine junction box protection

1. 3.      Production Composition
   Three parts in a complete of are flash protection

2. 1)      THT-APS-MU primary unit

The primary unit is the core of the arc light protection system, which is used to collect, measure and calculate input in different kinds to realize setting-up of various protection logics.

THT-APS-AC arc collection unit

The arc collection units is added when the collection points are beyond 16, and each unit can provide 16-way arc collection input at most.

3) THT-APS-FU Feeder protection unit

  The feeder protection unit is independently used as feeder type arc protection unit,and each unit can provide 3-way arc collection input at most.