Surge Protector Testing

Mday has introduced the principle and selection of surge protectors many times. Due to its key role in the protection of power systems and electronic equipment, the performance testing of surge protectors is crucial to ensure that they can effectively protect equipment when needed. Our customers came to our factory yesterday to test our products.

This inspection mainly includes the following tests:

Varistor selection test:

Varistor voltage (V1.0mA (V)): Under the specified DC current (1mA), the voltage value at both ends of the MOV is measured to reflect its sensitivity to overvoltage.

Maximum continuous working AC voltage (Uc) or DC voltage (Ucpv): The maximum AC voltage or DC voltage that can operate safely for a long time.

The Uc value of the product determines the selected varistor voltage. (For example, for a Uc275V product, we choose a 431K varistor, and for a 2P DC product with a Ucpv1000V, we choose a 142K varistor.)

‌Function and structural characteristics test‌:

‌Protection mode‌: Verify whether the surge protector has the required protection mode combination such as L-N, L-PE, N-PE, etc.

‌Separation device (tripping device) performance‌: When the surge protector deteriorates, it can reliably operate to disconnect the protector from the power system.

‌Status indication function‌: Check whether there are clear status indications such as normal and fault.

Action load test of Class I and Class II: For this test, the SPD should apply voltage UC, and then apply 15 8/20 positive polarity impulse currents, divided into 3 groups, 5 impulses each. The test piece is connected to the power supply of 8.3.4.2. Each impulse should be synchronized with the power supply frequency. Starting from an angle of 0°, the synchronization angle should increase step by step at intervals of 30°±5°.

Environmental adaptability and durability test‌:

‌Thermal stability: After the action load test that causes the SPD temperature to rise, the SPD is subjected to the specified maximum continuous working voltage under the specified ambient temperature conditions. If the temperature of the SPD can decrease over time, the SPD is considered to be thermally stable.

In addition, the detection of lightning surge arrester also includes leakage current testing, durability and aging testing, temperature rise testing, short-circuit tolerance testing, and labeling and instructions testing to ensure its safety and effectiveness in actual use‌.