Technical
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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 -
What about flashover protection?
Flashover protection is a high-voltage protection mechanism, which can be used for voltage flashover protection, circuit breaker flashover protection, insulating oil flashover protection, etc. in the power system. In short, flashover protection is a manifestation of voltage breakdown. What is fl...Read more -
The Importance of Partial Discharge Testing
What is partial discharge? Why do electrical equipment need partial discharge test? Partial breakdown of electrical discharges in the insulation of electrical equipment, which can occur near conductors or elsewhere, is called partial discharge. Due to the small energy in the initial stage of part...Read more -
What should I do if the insulating oil level is too high?
Insulating oil (also known as transformer oil) is a special kind of insulating oil that can ensure the normal operation of the transformer. When the transformer is running, under normal circumstances, the oil level of the transformer changes with the change of the transformer oil temperature. Whe...Read more -
Why does the ground resistance tester need to disconnect the electrode from the interior
Some grounding resistance measuring instruments require disconnection for measurement, while others do not, mainly due to the following considerations. If they are not disconnected, the following situations will occur: HV Hipot GDCR3200C double clamp multi-function grounding...Read more -
What is the significance of measuring DC resistance for transformers?
Transformer measurement of DC resistance is an important part of transformer test. Through DC resistance measurement, it s possible to check whether the conductive circuit of the transformer is in poor contact, poor welding, coil failure and wiring errors and a series of defects. ...Read more