[Arc Case] 6kv Busbar Working Power Switch Dynamic And Static Contact Contact Is Not In Place, Three-Phase Short Circuit Causes The Unit To Trip
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Author:hkwa49fa3
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Published time: 2019-07-01
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Arc protection is an ideal solution for medium and low voltage busbar protection of 35KV and below. It has the protection principle of reliable, practical, economical, safe, stable and fast. Arc protection can quickly remove faults, and is much higher than traditional relay protection.
At 17:20 on April 09, the No. 1 load was 100MW. During the 6kV plant power switching operation of the No. 1 unit, the 6kV1A bus working power switch was clamped from the “Test” position to the “Run” position. At 19:00, the 6kV 1A busbar of the No. 1 machine was powered by the standby power switch and replaced by the working power switch. The quick-cut device operated, closing the 6kV 1A busbar working power switch, and the standby power switch was opened, about 1 second the left and right working power switches tripped, and the 6kV 1A busbar losed power. At 19:01, Unit 1 tripped, the boiler MFT first "turbine trip", the engine ETS first "generator fault", on-site inspection No. 1 generator and transformer group protection C screen main transformer T60-I protection device "main variation" "Dynamic protection", "full stop" alarm; D screen main transformer T60-II protection device "main change differential protection", "full stop" alarm, C, D cabinet exit trip relays were all operating. 6kV1A bus low voltage I and II alarmed. On-duty operators pulled the 6kV1A busbar working power switch of No. 1 to the inspection position, and checked the switch's moving and static contacts for arc burn marks.
In order to prevent such accidents and prevent accidents from expanding, it is recommended that the 6kV 1A section busbar arc protection be used as a quick protection for the busbars, so that the fault can be quickly removed without expanding the power outage range.
Arc protection is an ideal solution for medium and low voltage busbar protection of 35KV and below. It has the protection principle of reliability, practicality, economy, safety, stability and speed. Arc protection can quickly remove faults, and is much higher than traditional relay protection.
Hangzhou Rizner Electric Co., Ltd. is a professional company specializing in the development, design, production, operation and sales of internationally leading arc protection and power system protection, automation and online monitoring equipment. Professional focus on arc protection for 15 years, is the earliest research and development of arc protection companies in China. It is also one of the three national standards for the protection of arc protection. Innovative solutions for arc protection are widely used in power systems in power plants, power bureaus and large factories and mines around the world. The arc light protection device produced by our company has complete models and is suitable for the wiring mode of various substations, providing rapid protection for medium and low voltage busbars in substations, power plants and industrial enterprises. The arc light protection system adopts the principle of double detection of arc detection and current detection, and has the characteristics of fast protection action and high reliability. When an arc short circuit occurs, it can be quickly positioned, and the arc light protection system can move quickly. The fastest 3 milliseconds in our company can detect the arc and make a judgment, cut off the fault current, and minimize the damage of the arc light to the equipment and personal injury.
