Why does the insulation resistance tester experience overheating?

The insulation resistance tester is a new generation of transformer DC resistance testing instrument, which is small in size, light in weight, and easy to carry. It has the characteristics of rapid measurement, convenient use, and high measurement accuracy. The self check and automatic calibration functions reduce the difficulty of instrument use and maintenance, and are also ideal equipment for measuring the DC resistance of transformer windings and high-power inductance equipment.

In practical use, if the insulation resistance tester overheats, it is mostly caused by the following factors. Let’s take a look together.

① Improper selection of wires and equipment during overload design, or current carrying exceeding the rated value, can cause equipment overload and heating.

② Poor heat dissipation: Various electrical equipment generally have certain measures for heat dissipation or ventilation. If these measures are damaged, it may cause the equipment to overheat.

③ Poor contact, loose connection of wire joints, poor contact of movable contacts, and electrolytic corrosion of copper aluminum joints can all cause overheating.

④ The insulation damage or prolonged overvoltage of equipment such as iron core heating transformers and motors, as well as increased eddy current and hysteresis losses, can cause the iron core of transformers and motors to heat up, leading to overheating.

⑤ Electric appliances such as lamps and furnaces that directly utilize the heat generated by current may also overheat if installed or used improperly. If electrical equipment overheats due to the above or other reasons, causing the conductor temperature to rise and heating combustible materials or objects around it, it may cause a fire.

⑥ During a short circuit, the current in the circuit generally increases by several to several tens of times, rapidly generating a large amount of heat energy, which can immediately burn through the insulation of the conductor; If heat energy is transmitted to combustible materials around it, it can cause combustion. The reason for the occurrence of a short circuit is due to the aging of the insulation of the equipment or the loss of insulation capacity due to high temperature, humidity, or corrosion, or mechanical damage to the insulation during the installation of electrical equipment. In addition, lightning overvoltage, insulation breakdown, wiring errors, and shell collisions may all cause short circuit faults.

ZC-430C Digital insulation resistance meter also known as megohmmeter, high voltage insulation resistance tester, etc., for the insulation resistance test. The instrument has a large LCD screen gray backlit display, data storage, data access, alarm, automatic shutdown and other

functions. At the same time, it also has the function of measuring DC voltage, AC voltage, absorption ratio and polarization index of DC voltage. It is suitable for measuring the resistance value of various insulating materials and the insulation resistance of transformers, motors, cables and electrical equipment.At the same time, it can output a variety of different voltage levels with the step-adjusting voltage function.

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