With the increasing complexity of power system operation environment and the deepening of power system reform, traditional power grids are accelerating the transformation to smart grids. The goal of equipment condition-based maintenance is achieved through real-time perception of equipment status by new sensors, reliable communication via modern network technology, and effective monitoring by background expert systems.I. Analysis of Condition-based Maintenance StrategyCondition-based Maintenance

With the accelerated automation of power equipment, various medium-voltage switchgear have emerged in the market. Classified by insulation media, they are mainly divided into air-insulated, SF₆ gas-insulated and solid-insulated types, each with its own advantages and disadvantages: solid insulation offers good performance but poor environmental friendliness, SF₆ features excellent arc extinguishing capability but is a greenhouse gas, and air insulation has high cost-performance but larger volume

As an expert who has been deeply engaged in the field of power system design for many years, I have always paid attention to the technological evolution and application practice of medium-voltage ring main distribution equipment. As a core electrical device in the secondary distribution link of the power system, the design and performance of such equipment are directly related to the safe and stable operation of the power supply network. The following is a professional analysis of the key design

1. Statistics on Common Faults of Medium-Voltage Switchgear in the Early Operation StageAs project participants, we found during the early operation of a new metro line: 21 sets of power supply equipment were put into use, with a total of 266 accident phenomena in the first year. Among them, 77 faults occurred in medium-voltage switchgear, accounting for 28.9%—significantly higher than faults in other equipment. Statistical analysis shows that major fault types include: protection device s

Due to the long service life and severe aging of the equipment, the switches in the 6kV working section of Unit 6 of a certain power plant have potential safety hazards such as deformed locating pins, abnormal closing positions of the earthing switches, and malfunctions of the protection devices. These hazards have threatened the stable operation of the unit, making the transformation extremely urgent. Meanwhile, considering the recent cases of electric shock casualties involving medium-voltage

As a professional engaged in power system operations, I recognize that medium-voltage (MV) switchgear plays a pivotal role in power distribution, metering, and protection. Ensuring its operational safety and reliability is critical—any malfunction can severely disrupt the entire power system. To enhance reliability, we must prioritize design-level optimizations, enabling MV switchgear to fulfill its functions and safeguard grid stability.1. Definition of Medium-Voltage SwitchgearIn my prac

Insulation Performance：Air - insulated Circuit Breakers: They use air as the insulating medium. The insulation performance of air is relatively limited. In harsh environments such as high humidity and high pollution, the insulation performance is easily affected. They are suitable for medium - and low - voltage applications.Gas - insulated Circuit Breakers: Commonly, gases such as sulfur hexafluoride (SF6) are used. They have excellent insulation performance and can withstand higher voltages, ma

High-Voltage Conductor SpikesDuring the installation of high-voltage conductors, accidental bumps or scratches can cause metallic spikes on the conductor surface, as shown in Figure 1. Under power-frequency voltage, the ionization effect of high electric fields at the spike tips generates charged particles, which may suppress partial discharge (PD) or breakdown. However, under impulse voltage, the ionization process induced by the strong electric field does not have sufficient time to develop, m

Gas - insulated metal - enclosed switchgear (GIS) is a switching device composed of switching appliances such as circuit breakers (GCB), disconnectors (DS), earthing switches (ES), as well as units like voltage transformers, current transformers, surge arresters, and enclosed busbars. High - potential components are all placed inside a grounded enclosed metal shell, which is filled with SF₆ gas with excellent insulating and arc - extinguishing properties as the insulating medium. GIS features a

Analysis of GIS Equipment Installation ProcessPre - installation Preparations for GIS EquipmentFirst, use a crane to lift the equipment to the entrance. Then, insert a crowbar into the groove of the channel steel to move the equipment along the channel steel into the room. It can be received by a roller or a forklift for transfer. Before the equipment installation after the transfer is completed, sufficient preliminary preparations are required. Firstly, the equipment needs to be comprehensively