Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

The cabling and undergrounding of urban power grid lines have become an irreversible trend in distribution network construction. High-voltage switchgear, as the core equipment of the distribution system, has become the main object of daily operation and maintenance for maintenance personnel. During the equipment iteration process, the comprehensive replacement and commissioning of new equipment have a long cycle, and a type of old hand-cranked high-voltage switchgear is still in service.Due to l

I. Market and Technical ResearchSince 2003, I have been engaged in the key project of localizing WVT-12 vacuum circuit breaker technology for Anhui Longbo Company. At that time, in the 12kV voltage class, vacuum circuit breakers had occupied more than 98% of the total circuit breakers. With the advancement of power grid construction and the growth of industrial and residential electricity demand, the domestic and international markets have shown a continuous upward trend in the demand for advanc

I. Equipment Dilemmas in Freezing WintersThe 35kV switch room of the 110kV substation in Luliang Oilfield, commissioned in 2002, has always been a key area for my maintenance team. The original ZN23-40.5/1600 vacuum circuit breakers, equipped with spring operating mechanisms, posed recurring challenges during subzero winters. With over 200 components and a 12-stage mechanical linkage, the spring mechanisms suffered severe wear on sliding friction surfaces. In temperatures as low as -40°C

VS1 - Type Indoor High - Voltage Vacuum Circuit BreakerThe VS1 - type indoor high - voltage vacuum circuit breaker is an indoor device for three - phase AC 50Hz with a rated voltage of 12kV. It is used for the control and protection of electrical facilities in industrial and mining enterprises, power plants, and substations. The circuit breaker arranges the main circuit and the operating mechanism on a special - shaped frame in a front - rear manner, that is, an integral layout. This structural

ZN63A Indoor AC High-Voltage Vacuum Circuit BreakerThe ZN63A indoor AC high-voltage vacuum circuit breaker is a three-phase AC 50 Hz, 12 kV indoor device, used for starting, stopping, controlling, and protecting high-voltage motors of 10,000-ton free forging presses. AC high-voltage vacuum circuit breakers play a critical role in enterprise production. Timely and accurate resolution of their faults to quickly restore production is essential for enterprise development. During the start/stop of hi

A vacuum circuit breaker is a type of circuit breaker in which both the arc - extinguishing medium and the insulating medium in the gap between the contacts after arc - extinction are vacuum. As a protection and control unit for power equipment and power - driven equipment in industrial and mining enterprises, indoor AC high - voltage vacuum circuit breakers have diverse applications and can be installed in fixed cabinets, middle - mounted cabinets, and double - layer cabinets. As a crucial elec

VS1 Indoor High - Voltage Vacuum Circuit Breaker Fault Analysis and Improvement MeasuresThe VS1 indoor high - voltage vacuum circuit breaker is an indoor switching device used in 12 kV power systems. Due to its excellent performance, it is especially suitable for places that require frequent operation at rated working current or multiple interruptions of short - circuit current. The operating mechanism of the VS1 indoor high - voltage vacuum circuit breaker is integrated with the circuit breaker

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

At present, most low - voltage switchgear assemblies in China mainly use SF₆ gas at a pressure of 0.5 - 0.6 MPa as the insulating medium. However, when the ambient temperature drops to around - 32.5°C, the SF₆ gas will quickly liquefy, resulting in serious problems with the insulation and interrupting capabilities of the product. To avoid affecting the operation of low - voltage switchgear assemblies in alpine regions, tracing heaters are often used to prevent the liquefaction of SF₆ gas

The floor - mounted tank - type circuit breaker is a crucial control and protection device in substations and power systems. It is mainly used to interrupt, close, and carry normal load currents in lines, and to cut off short - circuit currents during system failures. Composed of components such as interrupting elements, insulating bushings, bushing - type current transformers, arc - extinguishing chambers, operating mechanisms, and grounding casings, the arc - extinguishing chamber of the floor