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

Over - voltage and Over - current Aspects Ferroresonant over - voltage: In a non - effectively earthed neutral system, the magnetic circuits of equipment such as transformers, voltage transformers, and arc suppression coils may saturate, potentially triggering ferroresonance. The resulting over - voltage can increase the excitation current of the voltage transformer by dozens of times. Operating under high voltage and large current for an extended period causes the temperature of the transformer

Applications of Current Transformers in Industrial SettingsCurrent Transformers (CTs) play a crucial role in industrial applications, primarily used for measuring and protecting power systems that handle large currents. Below are the main uses of current transformers:1. MeasurementHigh-Precision Monitoring: CTs can proportionally convert large primary currents to smaller secondary currents, allowing standard measurement instruments (such as ammeters and wattmeters) to safely and accurately measu

Why Do Substations Use Voltage Transformers?Substations use voltage transformers (VTs), also known as potential transformers (PTs), primarily to safely and accurately monitor and measure the voltage in high-voltage systems. Here are the specific reasons for using voltage transformers:1. Safety Isolation High-Voltage Systems: Voltages in substations are typically very high, and direct measurement of these voltages poses significant risks to personnel and equipment. Isolation Function: Voltage tra

1. Current Transformer (CT)Working PrincipleThe basic principle of a current transformer (CT) is electromagnetic induction. It converts a large primary current to a smaller secondary current through a closed iron core, making it suitable for measurement and protection. Primary Winding: The primary winding usually has very few turns, sometimes just one turn, and is directly connected in series with the circuit being measured. Core: The core is closed to concentrate the magnetic field. Secondary W

Accuracy and calibrationFlux leakageIn open-close current transformer, the opening and closing of the iron core will lead to leakage of magnetic flux. Because the core is not a complete, continuous loop like a solid core transformer, part of the magnetic field line may escape through the gap. This can lead to inaccurate ratios. For example, if the transformer is designed with a ratio of 100:1 (the ratio of primary current to secondary current), magnetic flux leakage may bias the actual ratio, re

FuseFeatureThe fuse is a simple and effective circuit protection element. When the current flow in the circuit is large, the melt in the fuse (such as the fuse) will be blown due to overheating, thus cutting off the circuit and preventing the equipment in the circuit from being damaged due to overcurrent. In the use of AC power, it can protect various electrical equipment, lines, etc. connected to the AC power supply. For example, in the home circuit, if a short circuit fault occurs in an electr

High Voltage Current Transformer (HVCT) is a key device used to measure and monitor current changes in high voltage power systems. Its main role is to provide a safe and reliable way to detect and measure current without direct contact with high-voltage circuits. The following are the main roles of high voltage current transformers:Current measurementThe core function of the high voltage current transformer is to measure the current in the high voltage circuit. Because the current in high-voltag