Why does the high-voltage distribution cabinet fail?

Why is the high voltage distribution cabinet abnormal?

Reasons and regulations for common faults of power supply system in high-voltage distribution cabinet:

In the process of selecting the high-voltage distribution cabinet, it is necessary to follow the basic principles of reliability, ease of use and simplicity, so as to ensure that the selection of the high-voltage distribution cabinet is economically developed, scientific, reasonable and effective. In the case of selecting the low-voltage distribution box, it is necessary to establish the specific performance parameters of the low-voltage distribution box and the standards of the low-voltage distribution box for key components, The common faults of the power supply system leading to the distribution box are divided into the following conditions:

The common fault caused by unreasonable selection of electrical equipment in the distribution box is that the volume of the DC contactor is not properly selected during the production, the DC contactor with the same volume is assembled for the outgoing control circuit of different groups, and the imbalance of the three-phase load is not fully considered, so the current level of some incoming AC contactors cannot be selected by one current level based on the normal selection model and specification, Therefore, the DC contactor is burnt out during operation in high-temperature weather. The low-voltage electrical in the distribution box is composed of circuit breaker, DC contactor, leakage protection posture protection device, power capacitor and metering meter. This low-voltage electrical is designed and manufactured in accordance with gb1497 basic standard for low voltage electrical appliances, Corresponding requirements are made for their normal operation standards: the ambient gas temperature shall not exceed 40 ℃; The average value of ambient temperature of surrounding gas in 24h shall not exceed 35 ℃; The lowest value of ambient gas temperature shall not be lower than - 5 ℃ or - 25 ℃.

What are the detailed provisions of the distribution box on the power supply and distribution system? Class I power transformation equipment is commonly known as the core of driving power distribution equipment. They are centrally assembled in the company's power distribution station and distribute electromagnetic energy to subordinate substation equipment in different places. This level of machinery and equipment is close to the step-down transformer, so the main parameters of the electrical equipment are relatively high, and the volume of the output power circuit is relatively large. Secondary substation equipment is a general term for power distribution box and motor control core. The driving force distribution box is used in places where the load is decentralized and the control circuit is less; The motor control core is used for places with concentrated loads and many control circuits. They distribute the electromagnetic energy of a certain line of the upper level substation equipment to the nearby load. This level of facilities solves the maintenance, monitoring and operation of the load. The last level substation equipment is generally called the driving power distribution box of lighting fixtures. They avoid the core of the power supply system and are decentralized small volume substation equipment.