ZC-401A generator rotor AC impedance tester is the latest enhanced generator rotor AC impedance tester launched by our company. The instrument adopts the most advanced high-speed microprocessor technology, with more powerful functions, superior performance and more convenient use. The utility model has the characteristics of high reliability, simple operation, high…

Power workers often need to use dry-type test transformer in their actual work, so what is the correct use method of dry-type test transformer? Taking zc-501c series dry-type test transformer newly developed by Zhizhuo measurement and control as an example, this paper introduces the correct use method of dry-type test…

DC resistance measurement is an important item in transformer maintenance. The quality of the coil, whether the contact position of the tap switch is good, whether the coil or wire is broken, the correctness of the parallel branch and whether there is a short circuit can be checked by measuring…

Different structure forms of transformer winding are selected according to the capacity and voltage. Common are as follows:1. CylindricalIt is a simple form of concentric winding. Good processability, easy winding, high heat dissipation efficiency of interlayer oil passage, but poor stability of end support. It is generally used for low-voltage…

Circuit breaker refers to the switching device that can close, carry and break current under normal circuit conditions and close, carry and break current under abnormal circuit conditions within a specified time. Generally, those above 3KV are called high-voltage switches (or circuit breakers).Contact resistance refers to the resistance formed on…

Many power technicians don't know much about the cable fault tester, so this article will introduce the cable fault tester.Cable fault tester (also known as intelligent cable fault tester) is a comprehensive cable fault detection instrument. It can test the high resistance flashover fault, high and low resistance grounding, short…

Series resonance is a typical AC withstand voltage test device in power test. So what are the differences between series resonance and parallel resonance, and what are their characteristics?The difference between series resonance and parallel resonance: it has different functions in the resonant state of the circuit. Resonance means that…

The ultra-low frequency withstand voltage test is characterized by no damage to the tested cable, and it can also test the cable that is aging but can still be used. Therefore, it is a non-destructive withstand voltage test method.This test is more accurate than the DC high voltage test in…

Transformer winding deformation refers to the irreversible change of the size and shape of the winding due to mechanical force and electromotive force. It includes changes in axial and radial dimensions, valve body displacement, winding distortion, bulging and inter turn short circuit. The reason is that the transformer will inevitably…

1. Insulation resistance testInsulation resistance is the most basic insulation index of electrical equipment and circuits. When a DC voltage is applied to the dielectric, after a certain period of time, the resistance corresponding to the leakage current flowing through the dielectric is called insulation resistance.When the DC high voltage…