The main structure of oil immersed transformer is composed of body, oil tank, cooling device, protection device and outgoing device. The device body comprises an iron core, a winding (winding), an insulation, a lead wire and a tap changer; The oil tank includes the oil tank body and its accessories…

The transformer transformation ratio tester mainly tests the turns ratio or voltage ratio. It can overcome the shortcomings of the traditional transformation ratio bridge test. For this kind of instrument, its working principle and advantages are shown in the following.Working principle of transformer transformation ratio tester:The working principle of the…

When the wires and cables are energized, the metal core will heat up. With the increase of the energization time, the surface temperature of the wires and cables will get higher and higher. If it is not handled in time, the consequences can be imagined. The sheath of our commonly…

DC high-voltage generator is widely used in the power testing department to conduct DC high-voltage test on high-voltage electrical equipment such as zinc oxide arrester, power cable, transformer and generator. It is an important equipment in the high-voltage testing industry. However, some factors may affect the accuracy of the test…

The protection function of the series resonance test device can effectively protect the safety of the equipment during operation. However, in actual work, electric power workers still need to master the test method and conduct the test in strict accordance with the instrument. The following describes the protection function of…

The oil immersed transformer operates under high load. Once the critical temperature is exceeded, the transformer will start the "Self-protection" process and automatically trip. If the transformer is still in operation, it will cause damage and large-scale power failure. Once such an accident occurs, it is difficult to repair in…

Transformer is a very important part in power engineering construction. We often hear dry-type transformer (referred to as dry transformer) and oil immersed power transformer (referred to as oil transformer). What is the main difference between dry-type transformer and oil immersed power transformer in power engineering construction? What are their…

In actual use, if the live equipment is overheated, it may be caused by the following points.1. Core heating: insulation damage or long-term overvoltage, eddy current loss and hysteresis loss of transformer and motor and other equipment will lead to core heating of transformer and motor, which is easy to…

As we all know, in order to ensure the safety of the circuit during the operation of the power system, it is necessary to set the grounding. This ensures that after the circuit receives the internal overvoltage or lightning overvoltage, the current can find a safe distribution path to the…

The transformer DC resistance tester is subdivided into 1A , 3A, 5A, 10A, 20A, 40A, 50A, 100A and other specifications. The instrument power supply is divided into external power supply AC220V, internal power supply (battery power supply), AC and DC power supply. At present, the DC resistance testers above 10A on…