Technology Class

According to the regulations, the number of full voltage air load impact tests, the investment of new products should be impacted 5 times continuously; after large repair, it should be impacted 3 times. Each impact interval is not less than 5min, and someone should be sent to the scene to monitor the transformer before the operation. Check the opposite whether there is any abnormality.

Although the DC withstand voltage test and leakage current measurement methods are the same, their functions are different. The former is to test the insulation's dielectric strength, and its test voltage is higher; the latter is used to check the insulation condition, and the test voltage is relatively low.

When an indoor switch using SF6 gas as insulation and arc extinguishing medium leaks during use, the leaked SF6 gas and its decomposition products will accumulate in the indoor low-level space, resulting in localized hypoxia and toxicity, posing a serious danger to the life safety of the staff entering the room.

When cable faults occur, obstacles must be eliminated quickly to restore communications as soon as possible, first of all, the nature of the obstacle should be judged and then select the appropriate instrument to determine the precise location of the obstacle in time to carry out cable line repair work, the determination of the precise location of the obstacle is generally used to determine the precise location of the obstacle to the instrument cable fault tester.

This article will focus on the common methods of detecting rough fault points: the bridge method and the wave reflection method, hoping to help you quickly locate cable faults.

Refers to the ability to react to fault conditions within the specified protection range. A protective device that meets the sensitivity requirements shall be able to react sensitively and correctly to a fault within the zone, regardless of the location of the short-circuit point and the type of short-circuit.

Batteries with low internal resistance can discharge high currents easily, while those with high internal resistance discharge weakly. Internal resistance changes with power state and age.

The impact tests in electrical engineering generally include operation impact test, lightning impact test and steep wave front impact test, the purpose of which is to test the insulation strength of electrical equipment.

Both DC internal resistance and AC internal resistance measurements have their own unique principles and operations.