High-voltage disconnect switches are widely used in thermal power plants and are one of the important devices to ensure the stable operation of the power system in thermal power plants. They are mainly composed of moving and static contact components, switch bases, transmission mechanisms, operating mechanisms, porcelain insulators and porcelain insulator bases. During the maintenance of electrical equipment, high-voltage disconnect switches can disconnect the electrical equipment from the power

In modern power systems, high - voltage disconnect switches play a crucial role. They ensure the safe isolation of electrical equipment or lines during maintenance and the reliability during normal operation. Mechanical failures of high - voltage disconnect switches, such as poor contact, actuator failure, or structural component fatigue, can severely impact the stability and safety of the entire power system.Traditional fault - detection methods rely on regular maintenance and manual inspection

1. IntroductionIn Indonesia's power grid, 145kV high voltage disconnect switches (HVDs) are critical for maintaining transmission reliability across its archipelagic terrain. However, maloperation incidents pose significant risks to grid stability. This article investigates a 145kV HVD maloperation in an Indonesian substation, analyzing root causes and proposing countermeasures while referencing IP66 protection standards and IEC 60068-3-3 compliance to enhance operational safety.2. Incident Over

Maintenance Requirements for High-Voltage Disconnect Switches in Indonesia: Focus on 72kV Systems with IP66 Protection1. IntroductionHigh-voltage disconnect switches (HVDs) are critical components in Indonesia's power grid, ensuring safe isolation of electrical equipment during maintenance and system operations. In a country characterized by tropical climates, high humidity, and diverse environmental conditions, maintaining 72kV HVDs with strict standards is paramount. This article outlines the

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

CIS (Gas Insulated Switchgear) refers to a gas - insulated enclosed switchgear assembly. A busbar is a common pathway to which multiple devices are connected in parallel. In a CIS, the internal space of the busbar is relatively small, yet it operates under high voltage and current. Local discharge, if it occurs, can severely affect the inter - phase insulation and pose a significant threat to the safe and stable operation of the equipment. This article presents an analysis and solution of a loca

Overview of the SituationDuring the AC commissioning period of a certain substation, a flashover discharge fault of the post insulator occurred. The specific fault situation is as follows:When closing the 500 kV AC switchyard switch to charge the busbar, the dual - set busbar differential protection of the busbar operated, and the switch tripped. The fault phase was phase B, and the fault current was 5,760 A. The gas composition analysis of the SF₆ gas in the gas chamber was carried out, and the

As a key component of circuit breakers, the insulating pull - rod is an important insulating and transmission part of Gas - Insulated Switchgear (GIS) equipment. It is required to have high reliability in terms of mechanical and electrical properties. Generally, insulating pull - rods rarely malfunction, but once a failure occurs, it can have serious consequences for the circuit breaker.The 550kV circuit breaker in a certain power station has a single - break horizontal arrangement, with the mod

IntroductionThe LW12 - 500 tank - type SF₆ circuit breaker is a domestic high - voltage circuit breaker. As the operation time increases continuously, frequent failures of the main body and operating mechanism have had a significant impact on the safe and stable operation of the power grid, affecting the power supply reliability and causing the maintenance cost of the circuit breaker to rise year by year. Aiming at the common defects and faults of the LW12 - 500 tank - type SF₆ circuit breaker,

IntroductionIn the context of the African market, especially in Nigeria, the reliable operation of electrical equipment is of utmost importance for the stable development of the power industry. Tank - type SF₆ circuit breakers play a crucial role in power systems due to their excellent arc - extinguishing and insulating properties. However, like any electrical equipment, they are prone to failures. This paper presents a detailed case analysis of a tank - type SF₆ circuit breaker failure in Niger