Basic Principle Of Withstand Voltage Tester

Withstand voltage test refers to the test of the withstand voltage capability of various electrical devices, insulating materials and insulating structures. The process of applying a high voltage to an insulating material or insulating structure without destroying the performance of the insulating material is called a withstand voltage test. Generally speaking, the main purpose of the withstand voltage test is to check the ability of the insulation to withstand working voltage or overvoltage, and then to check whether the insulation performance of the product equipment meets the safety standards.
The basic principle of the withstand voltage test: a voltage higher than the normal working voltage is applied to the insulator of the device under test, and lasts for a specified period of time. If the insulation between them is good enough, the voltage applied to it will only produce a small leakage current. If the leakage current of the insulator of a device under test remains within the specified range within a specified time, it can be determined that the device under test can operate safely under normal operating conditions. When carrying out the withstand voltage test, the technical specifications of the tested products are different, and the measurement standards are also different. For general tested equipment, the withstand voltage test is to measure the leakage current value between the live wire and the casing. The basic rule is: twice the working voltage of the tested object plus 1000V is used as the standard voltage of the test. The test voltage of some products may be higher than this specified value. According to the regulations of IEC61010, the test voltage must gradually rise to the required test voltage value (such as 5kV, etc.) within 5s, and ensure that the test voltage value is stably applied to the insulator under test for no less than 5s. Comparing the current value with the leakage current threshold specified in the standard, it can be judged whether the insulation performance of the tested product meets the standard. After the test, the test voltage must be gradually reduced to zero within the specified time.