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

Discussion on Operation, Maintenance, and Fault Management of Power CapacitorsPower capacitors play a vital role in power systems by improving voltage quality and enhancing operational efficiency and economic performance. However, during long-term operation, they may experience various failures that affect their performance and reliability, potentially threatening the safety and stability of the entire system. Therefore, in-depth study of their operation, maintenance, and fault handling is essen

Power capacitors are a crucial component in power systems, primarily used to provide reactive power compensation to improve the system's power factor and stabilize voltage, protecting equipment from voltage fluctuations. However, during actual use, power capacitors often face oil leakage issues, which not only degrade their performance but can also pollute the environment and even cause fires or other safety accidents. This significantly affects the lifespan of the equipment and poses a serious

A substation without a grounding line selection device experienced a single-phase grounding fault. The fault location system (FA) pinpointed the fault section between switch A and switch B. On-site patrol and handling took 30 minutes to isolate the fault, with no need for trial tripping of non-faulty lines.The coordination between the main network and distribution network relies on a comprehensive analysis of "bus protection action, 3U0, three-phase voltage + line terminal alarm". Based on exist

As the frequency and severity of climate-related events such as storms, floods, and wildfires continue to rise, the development of climate-adaptive transformer designs has become an urgent need. Transformers, as a core component of power infrastructure, their ability to withstand extreme weather conditions is directly related to the stability of power supply. This article explores the technical specifications defining climate-adaptive transformer designs, focusing on four key dimensions: materia

1. Indicators Related to the Utilization Rate of Power Transmission TransformersThe utilization rate of power transmission transformers needs to consider both the cost of transmitting and distributing electrical energy and the utilization efficiency of the equipment itself. The core indicators mainly include three dimensions: load rate, load factor, and equipment life rate.1.1 Load RateIt refers to the ratio of the actual load at the moment of maximum load to the rated capacity of the transforme

1. Manifestations of Generator Set Transformer Failures1.1 Abnormal Temperature RiseAbnormal temperature rise directly reflects a transformer’s health and serves as a key fault - warning indicator. During operation, electromagnetic energy conversion causes iron and copper losses, which turn into heat. To ensure normal operation, transformers use heat - dissipation mechanisms like oil circulation and heat radiation to maintain internal temperature balance.Thermometers and online detecti

At 12:45 on August 4, 2022, a dispatching center received a report from a 100 MW photovoltaic power generation base. It was reported that the incoming line switchgear on the 35 kV low - voltage side of the main transformer at the collection station was on fire, and the protection action tripped. After receiving the notification, relevant personnel went to the site and carried out on - site accident investigation together with the operation technicians. Through on - site inspection, it was found

Generally speaking, the designed working magnetic flux density of the iron core in an oil-immersed power transformer can be around 1.75T (the specific value depends on factors such as no-load loss and noise requirements). However, there is a seemingly basic yet easily confusing question: is this 1.75T magnetic flux density value a peak value or an effective value?Even when asking an engineer with many years of experience in transformer design, they may not be able to give an accurate answer imme

The torque pulse rate characteristics of a stepper motor describe the variation of electromagnetic torque as a function of stepping rate in pulses per second (PPS). There are two characteristic curves, Curve 1 and Curve 2, shown in the figure below.Curve 1, represented by a blue line, is known as the pull-in torque curve. It indicates the maximum stepping rate at which the motor can start, synchronize, stop, or reverse under different load torque values. Similarly,Curve 2, shown as a red line, i

Hazards of Multi-point Core Ground FaultsA transformer core must not have multi-point grounding during normal operation. An alternating magnetic field around the winding induces parasitic capacitances between windings, core, and shell. Live windings couple through these capacitances, creating a core floating potential relative to ground. Uneven distances between components cause potential differences; when high enough, they spark. This intermittent discharge degrades transformer oil and solid in