Technical Guide
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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 -
Why does the AC Resonant Test System generate overvoltage?
The larger the capacitance of the tested product and the leakage reactance of the test transformer, the more obvious the capacitance rise effect. Therefore, when we carry out the AC withstand voltage test of the series resonance large-capacity test object, it is required to directly measure the v...Read more -
Transformer Tap Changer Analyzer winding testing method
Transformer on-load tap-changer tester winding mode: Wiring method (this determines the resistance algorithm, it must be correct); YO type wiring is that the transformer has a neutral point; The Y-type wiring is drawn from the transformer without a neutral point; △ type wiring When testing, ...Read more -
Principle of Pulse Current Method of Digital Partial Discharge Detector
When the field strength of the applied voltage in the electrical equipment is enough to cause the discharge in the insulating part area, but the discharge phenomenon that no fixed discharge channel is formed in the discharge area is called partial discharge. ...Read more -
The method to find resonance point in cable series resonance test
The cable series resonance test refers to the AC withstand voltage test of the cable using the series resonance test device. In addition, the device can also perform insulation tests on transformers, GIS, and electrical equipment other than large capacity. GDTF series cable frequency conversion s...Read more -
What is the significance of partial discharge detection for insulation products?
Partial discharge detection is of great significance to high-voltage cables and to study the characteristics of partial discharges in insulation, especially power cables. ...Read more