Mutual Inductor Core Quality Testing: Test Methods and Technical Guidelines-ZR-POWER

Jiangsu Zhengri Electric Power Equipment Co., Ltd.

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Mutual Inductor Core Quality Testing: Test Methods and Technical Guidelines

Release Time:

2025-08-19

Current and voltage transformers are critical equipment in power systems, and the quality of their iron cores directly affects the performance of the transformers. To ensure the high-quality iron cores, rigorous testing is essential. This article will introduce the test methods and technical guidelines for assessing the quality of transformer iron cores.

Mutual Inductor Core Quality Testing: Test Methods and Technical Guidelines

I. Overview

II. Detection Methods

1. Visual Inspection: First, visually inspect the current transformer core for any defects on its surface, such as cracks, rust, or dents.
2. Permeability Testing: Use a permeability meter to measure the magnetic permeability of the iron core, thereby evaluating its magnetic performance.
3. Eddy Current Testing: Use eddy current testing equipment to detect eddy current losses in the iron core and assess its quality.
4. Iron Loss Test: Under specified conditions, measure the iron loss of the core to evaluate its energy efficiency.
5. Magnetic Saturation Characteristic Testing: By applying a gradually increasing magnetic field to the iron core, we observe its magnetic saturation behavior to ensure it maintains excellent performance under various operating conditions.

III. Experimental Procedures

1. Preparation phase: Gather the relevant equipment, tools, and test samples.
2. Sample Preparation: Perform pre-treatment steps on the samples, such as cleaning and drying.
3. Set the test parameters: Based on the detection item, configure the appropriate test parameters.
4. Conduct the tests: Follow the inspection procedures and perform the visual inspection, permeability test, eddy current test, iron loss measurement, and magnetic saturation characteristic test in sequence.
5. Data Recording and Analysis: Record experimental data, perform analysis, and assess core quality.
6. Result Determination: Based on the test results, determine whether the core quality meets the standards.

IV. Technical Guidelines

1. Operators must possess professional knowledge and operational experience to ensure the accuracy and safety of the experiment.
2. Use standardized testing equipment and tools to ensure the reliability of test results.
3. During the experiment, relevant safety regulations should be followed to ensure the personal safety of operators.
4. For substandard iron cores, an analysis should be conducted to identify the root causes and implement improvements.
5. Regularly calibrate and maintain testing equipment and tools to ensure their accuracy and reliability.

V. Summary

This article introduces the test methods and technical guidelines for quality inspection of current transformer cores, covering detection techniques, experimental procedures, and practical guidance. Rigorous testing ensures the high-quality of transformer cores, thereby enhancing the overall performance of the transformers. We hope this article will provide valuable assistance to those involved in core quality inspections for current transformers.

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