Technical Guide

Technical Guide

  • What problems should be paid attention to in measuring absorption ratio polarization index

    What problems should be paid attention to in measuring absorption ratio polarization index

    Conditions for measuring the absorption ratio The absorption ratio and polarization index of the transformer with the voltage class of 10kv and the capacity of the distribution network transformer below 4000kvA can not be measured. When the transformer voltage level is 220kv or above and the capa...
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  • What tests should be done before and after the circuit breaker switch?

    What tests should be done before and after the circuit breaker switch?

    Circuit breakers are divided into oil circuit breakers, air circuit breakers, sulfur hexafluoride circuit breakers and vacuum circuit breakers according to the type of medium. Let’s take a look at the electrical test items to be done before and after the circuit breaker is overhauled. Test ...
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  • Precautions for insulating oil dielectric strength tester

    Precautions for insulating oil dielectric strength tester

    GD6100D precision oil dielectric loss automatic tester is an integrated insulating oil dielectric loss factor and DC resistivity tester developed according to the national standard GB/T5654-2007 “Measurement of Relative Permittivity, Dielectric Loss Factor and DC Resistivity of Liquid Insul...
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  • The important role of  phase detector in electric power system

    The important role of phase detector in electric power system

    The high-voltage wireless phase nuclear detector has strong anti-interference performance, meets the requirements of (EMC) standards, and is suitable for various electromagnetic field interference occasions. The measured high-voltage phase signal is taken out by the collector, processed and sent ...
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  • Common technical problems of Current transformer tester

    Common technical problems of Current transformer tester

    Current Transformer Characteristic Comprehensive Tester, also known as CT/PT Analyzer, is a multi-functional on-site testing instrument specially designed for relay protection professional testing of current transformer volt-ampere characteristics, transformation ratio testing and polarity discri...
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  • How to deal with the error of current transformer?

    How to deal with the error of current transformer?

    The secondary load of the current transformer directly affects its correct operation. Generally speaking, the greater the secondary load, the greater the error of the transformer. As long as the secondary load does not exceed the manufacturer’s setting value, the manufacturer should ensure ...
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  • Precautions for Sampling of Chromatographic Analyzer

    Precautions for Sampling of Chromatographic Analyzer

    The accuracy of test results and the correctness of judgment conclusions depend on the representativeness of the samples taken. Unrepresentative sampling not only causes waste of manpower, material resources and time, but also leads to wrong conclusions and greater losses. For oil samples with sp...
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  • Advantages of Zinc Oxide Arresters

    Advantages of Zinc Oxide Arresters

    The basic structure of the zinc oxide arrester is the valve plate. The zinc oxide valve is insulated under the operating voltage, and the passing current is very small, generally 10~15μA, and the nonlinear characteristics of the zinc oxide valve are mainly formed by the grain boundary layer. Its ...
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  • Test procedures to be followed when performing partial discharge tests

    Test procedures to be followed when performing partial discharge tests

    During the AC test voltage, the commonly used partial discharge measurement procedure is as follows: (1) Sample pretreatment Before the test, the sample should be pretreated according to the relevant regulations: 1. Keep the surface of the test product clean and dry to prevent local squares cause...
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  • Significance of preventive test of electrical equipment

    Significance of preventive test of electrical equipment

    When electrical equipment and appliances are working, they will be subjected to overvoltages from inside and outside that are much higher than the normal rated working voltage, resulting in defects in the insulation structure of electrical equipment and latent faults. In order to timely discover ...
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  • How much do you know about the meaning of wire colors

    How much do you know about the meaning of wire colors

    The red light stops, the green light goes, the yellow light is on, and so on. The signal lights of different colors represent different meanings. This is a common sense that children in kindergarten know. In the power industry, wires of different colors also represent different meanings. The foll...
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  • Types of partial discharge tests and suitable sites

    Types of partial discharge tests and suitable sites

    There may be partial discharge in the insulation medium of power equipment in newly-made cables or cables in long-term operation. In order to detect such insulation defects and deterioration as soon as possible, partial discharge tests on cables can prevent and find problems and stop losses in ti...
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