Technical Guide
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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 -
Test method of Earth resistance tester
Preparing for the test 1. Before use, you should read the instruction manual of the product to understand the structure, performance and usage of the instrument; 2. Inventory the spare parts and accessories needed in the test and whether the battery power of the tester is sufficient; 3. Disconnec...Read more -
Introduction for Measuring Method of Transformer Partial Discharge
HV Hipot GD-610C remote ultrasonic partial discharge detector 1.Electric meter or radio interference meter to find the waveform of the disc...Read more -
How to discharge after DC withstand voltage test
Discharge method after DC withstand voltage test, and how to choose discharge resistor and discharge rod: (1) First cut off the high voltage power supply. (2) When the voltage of the sample to be tested drops below 1/2 of the test voltage, discharge the sample to ground through the resistance. (3...Read more -
What problems should be paid attention to when using insulation resistance?
Which of the following problems should be paid attention to when using insulation resistance? HV Hipot GD3000B Insulation Resistance Tester First of all, when testing the insulation resistance of the test object, we need to know the capacity and voltage level of the test object, and com...Read more