Pulse high voltage is a single-pole, short-term, high-frequency direct current high-voltage variant. These voltages are divided into two: lightning impulse and switching impulse high voltages.

In high-voltage technology, impact high voltages are required for the following purposes:

• To represent the stresses caused by internal (switching) and external (lightning) overvoltages in high voltage tests
• Investigation of high tensile strength systems of materials
• To test whether the electromechanical products produced comply with national and international standards

The pulse voltages may be short-term pulses or high amplitudes. Therefore, it must be measured accurately. The measurement systems to be used in the calibration and tests to be carried out in the authorized laboratories shall be in accordance with the following basic standards:

• TS EN 60060-1 High voltage test techniques - Part 1: General description and test rules
• TS EN 60060-2 High voltage test techniques - Part 2: Measuring systems

1 milliseconds are the time when the overvoltages, which are caused by lightning strikes, are called atmospheric or external overvoltages. The voltages produced in laboratory environments to simulate these impact voltages are called lightning impulse high voltages.

In laboratory applications, generators that artificially create high impact voltage are used. These generators create a similarity to the voltage generated naturally by lightning or the pulses that occur during switching in a power grid.

What is expected from the tests is that each core of the cable is resistant to the 10 positive and 10 negative voltage pulses. After the impact test, each core of the cable sample is subjected to the power frequency voltage test for 15 minutes at ambient temperature.

Among the many tests carried out by the authorized laboratories within the scope of electrical tests, lightning impact tests are performed.