Technical Guide
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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 ...Read more -
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...Read more -
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 ...Read more -
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...Read more -
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 ...Read more -
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...Read more -
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...Read more -
The difference between electrical primary equipment and secondary equipment
The difference between electrical primary equipment and secondary equipment: Primary equipment refers to the high voltage electrical equipment directly used in the production, transmission and distribution of electric energy. It includes generators, transformers, circuit breakers, disconnectors, ...Read more -
What are the test items for the transformer in operation?
What are the test items for the transformer in operation? ? ? ? ? ? ? ? ? ? ? ? ? HV HIPOT GDBT-Transformer Characteristics Comprehensive Test Bench (1) Measure the insulation resistance, absorption ratio and DC resistance of the winding. (2) Measure the leakage current and dielectric depletion f...Read more -
Transformer winding deformation – local deformation
Local deformation means that the total height of the coil has not changed, or the equivalent diameter and thickness of the coil have not changed in a large area; only the size distribution uniformity of some coils has changed, or the equivalent diameter of some coil cakes has changed to a small e...Read more -
What are the causes of “partial discharge”
The so-called “partial discharge” refers to a discharge in which only a part of the insulation system discharges without forming a penetrating discharge channel under the action of an electric field. The main reason for partial discharge is that when the dielectric is not uniform, the...Read more -
What are the consequences of poor grounding?
The sum of the grounding resistance of the grounding body or the natural grounding body and the grounding wire resistance is called the grounding resistance of the grounding device. The grounding resistance value is equal to the ratio of the grounding device’s voltage to the ground to the c...Read more