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

The ZW7 - 40.5 outdoor vacuum circuit breaker uses vacuum as the arc - extinguishing medium. The moving end of the arc - extinguishing chamber is connected to the output shaft of the operating mechanism through a crank arm and an insulating tie - rod. The overall structure of the circuit breaker is of the porcelain - bushing pillar type.The upper porcelain bushing serves as the arc - extinguishing chamber porcelain bushing, and the lower one acts as the supporting porcelain bushing. The three -

Types of Maintenance ProjectsThe maintenance projects for 12kV outdoor high - voltage vacuum circuit breakers can be classified into three categories: major maintenance projects, minor maintenance projects, and ad - hoc maintenance projects.Typically, major maintenance projects include the overhaul of the conductive circuit, insulation bushing, vacuum interrupter, and current transformer, replacement of seals, testing of contact pressure springs, and maintenance of the operating mechanism. Addit

Fault PhenomenonOn June 23, 2020, a fault occurred in the 35 kV feeder bay that was on hot standby at a 220 kV substation. This triggered the operation of the first - stage, first - time - limit voltage - restrained overcurrent protection of the low - voltage backup protection of the No. 2 main transformer and the second - stage overcurrent protection of the 350 bus tie protection. Consequently, the 352 circuit breaker on the low - voltage side corresponding to the No. 2 main transformer and the

Reasons for Over - load Operation of Distribution TransformersUnreasonable Monitoring MethodDuring the operation of a transformer, to ensure its safe operation, the load of the transformer is monitored. Currently, round - the - clock monitoring is mostly adopted to obtain the average load of the distribution transformer. However, due to the different demands for electrical appliances at different times, as well as the different power and quantity of equipment in operation in enterprises at diffe

IntroductionIn the complex landscape of power distribution, distribution transformers play a pivotal role. These transformers are tasked with stepping down voltage from the primary distribution levels to the appropriate utilization voltages for end-users. Their proper functioning is crucial for maintaining a stable and efficient power grid. This article delves into two essential aspects of distribution transformer assessment: thermal performance testing and mechanical performance testing, while

The Importance of LubricationIn high-voltage circuit breakers, lubrication plays a crucial role. Not only does lubrication affect the service life of the circuit breaker, but it also directly impacts its safety and reliability. Poor lubrication can lead to slow operation of the circuit breaker and even failure to function properly at critical moments, resulting in serious power system failures.Why is lubrication essential in the high-voltage circuit breaker operating mechanism?Lubrication in the

What is Induction Motor Maintenance ?Induction motor maintenance definitionInduction motor maintenance involves operations that increase the life of the equipment and help it operate more efficiently.Maintenance types of induction motorsSquirrel cage induction motors: Squirrel cage induction motors require much less maintenance because they do not contain brushes, commutators, or slip rings.Coil rotor induction motor: Because it contains slip rings, brushes, so it does need to be maintained from

What is the Maintenance of Transformers ?Maintenance of transformers is essential to ensure their safe, stable and efficient operation, and the following are some common maintenance measures:Periodic inspectionAppearance check: Check whether the transformer shell is damaged, deformed, and leaking oil.Oil temperature check: Use an oil temperature gauge to measure the oil temperature and ensure that it is within the normal range.Oil level check: Observe the oil level in the oil pillow. If the oil

Power electronic converters will serve as the fundamental components of modern power systems. However, they may suffer from poorer reliability if not properly designed, consequently affecting the overall performance of power systems. Accordingly, the converter reliability should be taken into account in design and planning of Power Electronic-based Power Systems (PEPSs). Optimal decision-making in planning of PEPSs requires precise reliability modeling in converters from component up to syste

This article aims to incorporate the reliability model of power electronic converters into power system reliability analysis. The converter reliability has widely been explored in device- and converter-levels according to physics of failure analysis. However, optimal decision-making for design, planning, operation, and maintenance of power electronic converters require system-level reliability modeling of power electronic-based power systems. Therefore, this article proposes a procedure to eva