Technical
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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 -
10kV parallel capacitor bank commissioning test items and standards
I. Test Items and Requirements 1. Insulation Resistance Test Core Instrument Equipment: 2500V Megohmmeter, 1000V Megohmmeter Standard and Procedure Requirements: For the capacitor pair and shell: Use 2500V Megohmmeter to test, with the insulation resistance value not less than 500MΩ. For the smal...Read more -
Classification, Application and Selection of Current Transformer Testing Equipment
I. Classification of Current Transformer Testing Equipment (1) Classification by Functional Integration Single-function tester With a single function, it usually only tests one parameter, such as ratio, polarity or volt-ampere characteristics. The equipment structure is relatively simple, but the...Read more -
Test regulations and methods for power frequency discharge voltage of surge arresters
General Requirements Measuring the power frequency discharge voltage is a mandatory item for both distribution-type (FS) lightning arresters and those with series gap metal oxide lightning arresters. For each lightning arrester, three power frequency discharge tests should be conducted, with an i...Read more -
Classification, Application and Selection Method of High Current Generators
High current generators are mainly classified based on the type of output current and structural form, with different types corresponding to different application scenarios. I. Classification by Current Type AC High Current Generator Core Features: Outputs a pure 50Hz sinusoidal current with a sm...Read more -
Test Method for Harmonic Braking Coefficient of Relay Protection Calibration Instrument
Harmonic braking coefficient verification (for transformer differential protection) test wiring Connection method 1 (Applying current to both high and low voltage sides simultaneously): The microcomputer relay protection calibration instrument IA is connected to the A phase on the high-voltage ...Read more -
Safety Technical Measures and Precautions for Transformer Tests
Safety Technical Measures and Precautions for Transformer Tests The personnel participating in the commissioning must be familiar with the performance, technical data and technical standards of the transformer. The commissioning personnel must be certified to work. Personnel participating in the...Read more -
Safety Precautions for On-Site Measurement of Transformer Insulation Resistance in Summer
The insulation resistance value of the transformer is evaluated based on the resistance value at 1 minute. The insulation resistance of the coil at 20℃ should not be less than 2000 MΩ. The insulation resistance of the core should not be less than 200 MΩ. If it is lower than the above requirements...Read more -
Test Procedures for Insulation Resistance, Absorption Ratio and Polarization Index
Insulation resistance, absorption ratio and polarization index test: Generally, manual voltmeters, electric voltmeters, and digital voltmeters are selected. The basic principle of the megohmmeter, whether it is an analog type or a digital type, is based on the same principle, that is, the curren...Read more -
Standardized Test Solution for Cable Cross-Interconnection System
Cross-linked system Measurement purpose Check the ability of the cable outer sheath, the outer sheath of the insulation joint and the insulation clamp to withstand the specified voltage: Check the performance of the nonlinear resistance type sheath overvoltage protector to ensure that the metal ...Read more -
Precautions in DC withstand voltage test and DC leakage test
DC withstand voltage test and DC leakage test (1) Methods of DC withstand voltage test and DC leakage test DC withstand voltage test: The test voltage is generally divided into 2 to 5 sections, with each section’s amplitude being as equal as possible. During the voltage increase process, ...Read more