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

Transformer grounding protection measures are divided into two types: The first is transformer neutral point grounding. This protection measure prevents neutral point voltage drift caused by three-phase load imbalance during transformer operation, enabling protection devices to trip quickly and reducing short-circuit currents. This is considered functional grounding for the transformer. The second measure is grounding of the transformer core and clamps.This protection prevents induced voltages f

Eco-friendly gas-insulated ring main units (RMUs) are important power distribution equipment in electrical systems, featuring green, environmentally friendly, and high-reliability characteristics. During operation, arc formation and interruption characteristics significantly affect the safety of eco-friendly gas-insulated RMUs. Therefore, in-depth research on these aspects is of great significance for ensuring the safe and stable operation of power systems. This article aims to investigate the a

Common inverter faults mainly include overcurrent, short circuit, ground fault, overvoltage, undervoltage, phase loss, overheating, overload, CPU malfunction, and communication errors. Modern inverters are equipped with comprehensive self-diagnostic, protection, and alarm functions. When any of these faults occurs, the inverter will immediately trigger an alarm or shut down automatically for protection, displaying a fault code or fault type. In most cases, the fault cause can be quickly identifi

Discharge Load for Energy Absorption: A Key Technology for Power System ControlDischarge load for energy absorption is a power system operation and control technology primarily used to address surplus electrical energy caused by load fluctuations, power source faults, or other disturbances in the grid. Its implementation involves the following key steps:1. Detection and ForecastingFirst, real-time monitoring of the power system is conducted to collect operational data, including load levels and

I. Fuse Structure and Root Cause AnalysisSlow Fuse Blowing:From the design principle of fuses, when a large fault current passes through the fuse element, due to the metal effect (certain refractory metals become fusible under specific alloy conditions), the fuse first melts at the soldered tin ball. The arc then rapidly vaporizes the entire fuse element. The resulting arc is quickly extinguished by quartz sand.However, due to harsh operating environments, the fuse element may age under the comb

With the continuous advancement of smart grid technology, intelligent monitoring systems are playing an increasingly important role in preventing and addressing faults in voltage transformers. These modern intelligent monitoring systems can collect key parameters from voltage transformers in real time—such as partial discharge levels, temperature, and oil quality—and use data analysis algorithms to assess the health status of the equipment, enabling early fault warnings and p

I. Key Elements of Mechanical Structure DesignThe mechanical structure design of AIS voltage transformers ensures long - term stable operation. For 66 kV outdoor AIS voltage transformers (pillar - type structure): Pillar Material: Use epoxy resin casting + metal frame for mechanical strength, pollution/weather resistance. Special design needed for 66 kV (vs 35 kV & below). Dry - type insulation (porcelain/epoxy shell) requires sufficient bending/impact resistance for harsh outdoors. Heat Dis

Impact on Insulation Performance Changes in Insulating Material Properties: AIS voltage transformers rely on air as the insulating medium, and they also contain some solid insulating materials, such as insulating paper and insulating bushings. When the temperature rises, the migration and evaporation of moisture in solid insulating materials like insulating paper will accelerate, resulting in a decrease in the electrical strength of the insulating materials and an increased risk of insulation br

In 10 kV and 35 kV ungrounded systems, single - phase grounding faults cause minimal current, so protection rarely trips. Per regulations, operation is limited to 2 hours; prolonged undetected faults may worsen, even damaging switches. While the State Grid promotes small - current grounding line selection devices in 110 kV and 220 kV substations, their accuracy remains low, requiring monitoring/operation staff to analyze remote measurements. For ungrounded systems with three - phase 4PT voltage

Hey everyone! I'm James, a professional with over 10 years of experience installing voltage transformers. Today, I want to talk about the selection and installation of Air Insulated Switchgear (AIS) voltage transformers in 66kV outdoor substations.These devices are critical for measurement and protection in power systems. Their proper selection and installation directly affect the safety and stability of the entire electrical grid. With the advancement of smart grid technology, electronic AIS vo