In terms of policy, China's power system implements a two-part electricity price: in addition to charging the fees measured by the metering device, it also charges basic electricity fees according to the transformer capacity, and larger users have to pay a one-time capacity increase fee when putting the transformer into…

1.Characteristics of series resonanceThe circuit is purely resistive, and the terminal voltage is in phase with the total current. At this time, the impedance is the smallest and the current is the largest. High voltage may be generated on the inductance and capacitance many times larger than the power supply…

CTP-1000c tester is a new generation of CT and Pt testing instruments developed by our company. It adopts high-performance DSP and FPGA and advanced manufacturing technology to ensure stable and reliable product performance, complete functions, high automation and high testing efficiency. It is a professional testing instrument for transformer in…

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…