How to quickly demagnetize a power transformer after direct resistance test?

After conducting DC resistance measurement operations on power transformers, residual magnetism will remain in their iron cores. If residual magnetism is not handled, it may have many adverse effects on the relay protection devices and primary equipment of power transformers. Excessive excitation inrush current can cause the transformer to fail to close, as well as mechanical vibration of the transformer itself, causing displacement of the winding structure, affecting the lifespan of the power transformer and even causing permanent damage. So we must do demagnetization work before the transformer is put into operation to ensure the safe and normal operation of the transformer.

Product characteristics:

1. Short testing time

Connect once and complete the measurement of three-phase winding resistance to automatically calculate three-phase imbalance

2. High output current

High testing current, capable of quickly measuring the winding resistance of large capacity transformers

3. Magnetization and demagnetization functions

In the face of large capacity transformers, accelerate the charging (demagnetization) speed of the iron core to achieve faster measurement of winding resistance value

4. Perfect protection function

The instrument has various protection functions such as 380V misconnection protection, back electromotive force protection, wire break protection, power outage protection, and grounding wire failure alarm

5. Conversion of resistance value change rate

It can automatically calculate the change rate of resistance values within 5S, 15S, and 30S, which can assist testers in judging the stability of test data and prevent misreading of data

The ZC-205CZX three-phase DC resistance tester is a new generation of fast tester that integrates auxiliary magnetic testing, three-phase testing (Yn, Y, △), and demagnetization functions. It is an ideal equipment for measuring the DC resistance of large power transformers. The screen adopts True color large screen high resolution LCD display, touch control plus shuttle knob operation, which is convenient for on-site use. With Chinese menu prompt function, easy and intuitive operation, all direct resistance test items can be completed in one connection, with fast testing speed, high accuracy, and wide range.

Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com