400KV Gas-Insulated Switchgear (GIS) test equipment plays a crucial role in ensuring the efficiency and reliability of high-voltage electrical grids. GIS technology has revolutionized how power is transmitted and distributed, offering numerous benefits compared to traditional air-insulated switchgear.To ensure the proper functioning of GIS equipment, thorough testing is essential. There are different test equipment for GIS. Let's study below main equipment.
1. Partial discharge detector
Function: Monitor partial discharge (PD) in GIS and identify insulation defects (e.g., particle contamination, suspension potential).
Type: High frequency current Transformer (HFCT), ultra High frequency (UHF) sensor, Acoustic detection (AE).
Supplement: The UHF method is suitable for positioning power supply, AE method is more sensitive to mechanical loosening.
2. High-voltage withstand test equipment
Power frequency/frequency conversion voltage tester: Verify the main insulation strength (such as 20- 300Hz variable frequency series resonant test system.
Lightning impulse/Operational impulse generator: Simulate overvoltage conditions and test insulation resistance.
3. SF6 Gas Analyzer
Detection parameters: gas purity, humidity (dew point below -60℃), decomposition products (SO2, H2S, etc.).
Equipment examples: laser spectrum analyzer, electrochemical sensor.
Gas leak detector
Infrared imager or ultrasonic leak detector: Locate small leaks to ensure tightness.
4. Circuit breaker analyzer
Circuit breaker mechanical characteristics test, Opening and closing time, speed, travel curve.
5. Contact resistance tester
Usage: Measure the contact resistance of the main circuit (microohm level), check the overheating caused by poor contact.