Technical Guide
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Technical Scheme for Determining the Capacity of Series Resonance Voltage Withstand Test Equipment
Test subject and test requirements 1. AC withstand test for a 35kV/400mm2 cable for 1.2km, with capacitance ≤ 0.258uF, test frequency 30-300Hz, test voltage 52kV, test duration 60 minutes. 2. The AC withstand test for the 35kV/60000kVA main transformer, with an capacitance of ≤ 0.02uF, is conduc...Read more -
The selection method of current size for DC resistance tester
The selection of the current for the DC resistance tester is essentially a trade-off between measurement speed, signal stability, and preventing overheating while ensuring measurement accuracy. In simple terms, for large transformers or low-resistance measurements, a high current is suitable; for...Read more -
Equipment and Test Methods for Partial Discharge Detection of Electric Motors
A complete partial discharge test system for motors typically includes the following core equipment, with specific configurations varying depending on the test object (such as the entire vehicle, stator, or individual coils) and the test standards. I. Core Components High Voltage Unit This includ...Read more -
The wiring method of the test transformer during DC withstand voltage or leakage tests
The wiring diagram for the test transformer when conducting the DC withstand voltage or leakage test on the tested item is shown in Figure 7. Note: This test should be carried out first by removing the short-circuit lever “D”, as shown in Figure 7. In the figure: VD – high-silic...Read more -
Application scenarios of vacuum switch vacuum degree tester
The vacuum degree of a vacuum switch is a core indicator for evaluating its arc-extinguishing capability and insulation performance. Regular testing with a vacuum degree tester is a key measure to ensure the safe operation of the power system. The following is a detailed summary of its applicatio...Read more -
Five types of AC withstand voltage tests and operational precautions
The AC withstand voltage test applies an AC test voltage to the insulation of electrical equipment. This test voltage is higher than the equipment’s rated value. The AC withstand voltage test is a type of test where the working voltage is relatively high and lasts for a certain period of ti...Read more -
Standard Specifications for AC Withstand Voltage Test of High-Voltage Reactors
The core standard for the AC withstand voltage test of high-voltage reactors is GB 50150-2016 “Code for Handover Test of Electrical Equipment in Electrical Installation Projects”, which is a key project to test the main insulation strength of reactors. The following is a detailed inte...Read more -
Requirements for measuring the DC resistance of windings during transformer tests
The insulation dielectric performance test of instrument transformers shall comply with the following provisions: 1. The performance of insulating oil shall meet the specified requirements; 2. For instrument transformers filled with SF₆ gas, sampling and testing shall be carried out after stand...Read more -
Selection of Dielectric Loss Factor tgδ Test Equipment and Test Methods
Dielectric loss factor tgδ test: The principle of this test has been explained earlier. tgδ is the ratio of IR to IC, and it can reflect the amount of energy loss per unit volume within the dielectric material. It is only related to the properties of the dielectric material and has nothing to do ...Read more -
Instruments and test methods for measuring the breakdown voltage of transformer oil
Transformer oil test (routine test) The routine tests for transformer oil include breakdown voltage measurement, dielectric loss factor measurement, water content determination, gas content determination and dissolved gas chromatographic analysis. Breakdown voltage measurement Test Objective T...Read more -
Advantages and Limitations of the Technical Principles of Ultra-High Frequency Partial Discharge Detection Instruments
The technical principle of the ultra-high frequency partial discharge detector is based on electromagnetic field theory and modern signal processing technology. It can be clearly dissected into three aspects: physical mechanism, signal processing flow, and positioning method. I. Physical Principl...Read more -
The Working Principle and Application Scope of DC High Voltage Generator
DC high-voltage generators are key instruments for conducting preventive insulation tests on high-voltage electrical equipment in power systems, industrial and mining enterprises, and research institutions. They are mainly used for DC withstand voltage tests and leakage current detection on power...Read more