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

As new energy electric vehicles become increasingly popular, the number of supporting public charging piles is growing year by year. Whether the measurement value of AC charging piles for electric vehicles is accurate is directly related to the vital interests of the vast number of electric vehicle owners. So, conducting regular mandatory inspections of charging piles is particularly important. Below, combined with relevant regulations and practical work, I’ll share some experience and

As an important part of the new power system, the stable operation of commercial and industrial energy storage systems is directly related to energy utilization efficiency and enterprise economic benefits. With the rapid growth of the installed capacity of commercial and industrial energy storage, equipment failure rate has become a key factor affecting investment returns. According to data from the China Electricity Council, in 2023, the proportion of unplanned outages of energy storage power s

I. IntroductionWhen replacing ABB RS series single - phase voltage regulators with single - phase power voltage regulators in industrial sites, there are many core difficulties, such as mismatched technical parameters, incompatible control interfaces, complex system integration, and compliance with safety standards. If these problems are not properly addressed, the system may fail to function properly, operate unstably, or even pose safety hazards. Having worked at ABB for 10 years, I am very fa

Single - phase distribution transformers, as crucial voltage transformation and power distribution equipment in the power system, are widely used in rural power grids, low - voltage residential areas, and areas with concentrated single - phase loads.With the continuous increase in the proportion of single - phase loads in the distribution network, the failure rate of single - phase transformers has also increased. Timely identification and handling of these faults are of great significance for e

IntroductionAs the scale of photovoltaic power stations continues to expand, pad - mounted transformers, as one of the key equipment, have a profound impact on the operation of the system when they fail. This paper focuses on using advanced artificial intelligence algorithms and integrating data analysis technology to improve the accuracy and efficiency of fault diagnosis for pad - mounted transformers in photovoltaic power stations, and to build a solid technical foundation for the safe and sta

I. Core Cause of Damage: Electrodynamic Impact (Complying with GB/T 1094.5 / IEC 60076-5)The direct cause of high-voltage winding end collapse is the instantaneous electrodynamic impact induced by short-circuit current. When a single-phase grounding fault occurs in the system (such as lightning overvoltage, insulation breakdown, etc.), the grounding transformer, as the fault current path, withstands high-amplitude and steep-rise-rate short-circuit currents. According to Ampère's force

1 Theoretical AnalysisIn distribution networks, grounding transformers serve two key roles: powering low - voltage loads and connecting arc - suppression coils at neutrals for grounding protection. Grounding faults, the most common distribution network fault, heavily impact transformers’ operating characteristics, causing sharp changes in electromagnetic parameters and status.To study transformers’ dynamic behaviors under single - phase grounding faults, build this model: Ass

The neutral grounding mode refers to the connection between the power system neutral point and ground. In China's 35 kV and below systems, common methods include ungrounded neutral, arc-suppression coil grounding, and small-resistance grounding. The ungrounded mode is widely used as it allows short-term operation during single-phase grounding faults, while small-resistance grounding has become mainstream for its fast fault removal and overvoltage limitation. Many substations install grounding tr

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

Inability to Push In or Withdraw the Draw-out CarriageThe main manifestation is difficulty in inserting the carriage, which may cause equipment damage and threaten production when severe. The causes and countermeasures are shown in Table 1.The circuit - breaker fails to close. It manifests as the closing core actuating but the circuit - breaker not closing successfully; or the closing core not actuating, which shows that the control circuit of the circuit - breaker is open - circuited or the mec