The Purpose and Method of Current Transformer Demagnetization

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According to the national metrology standards, metrological grade transformers must be demagnetized before measuring errors. The error is not accurate if it is not demagnetized. The main reason is that the iron core has residual magnetism.When the current suddenly decreases, the transformer core is

Ground resistance measurement principle and measurement method

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1. What is ground resistance?Ground resistance is the resistance encountered when current flows from a grounding device to the earth and then flows through the earth to another grounding body or disperses to a distance. It includes the resistance of the grounding wire and the grounding body itself,

What is ferromagnetic resonance overvoltage?

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There are a large number of "energy storage components" in the power system, which are capacitors that store electrostatic energy and inductors that store magnetic energy. These components form various oscillation loops. During normal operation, these oscillation loops are damped or shunte

The Difference and Principle of Wiring Between Transformer Dyn11 and Yyn0

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Transformer Dyn11 connection method: high-voltage side triangle, low-voltage side star-shaped with neutral line, high voltage and low voltage have a 30-degree phase differenceTransformer Yyn0 connection method: high-voltage side star, low-voltage side star with neutral line, there is no phase differ

The Difference Between Neutral Point Grounded and Neutral Point Ungrounded

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There are many ways to operate the neutral point of the power system: ungrounded, grounded through a resistor, grounded through an arc suppression coil, or directly grounded. There are three main neutral point grounding methods currently used in my country's power system: ungrounded, arc suppres