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Products Description
The HMGTU-1200KVA/600KV GIS test system primarily consists of a control system, a high-voltage power supply system, a test specimen interface system, and a low-voltage power supply system. When testing is conducted in an unshielded environment, the harmonic content of the test power supply is <5%. At rated voltage, the partial discharge level of the entire system is less than 2 pC, and at 80% of rated voltage, it is less than 1 pC. The unit connects to the test specimen via a dedicated interface in a single step, enabling the completion of withstand voltage and partial discharge tests on the specimen. The annual leakage rate of each sealed gas chamber is less than 0.5%.
Products parameters
1. GTU High-Voltage Test Transformer
The transformer consists of an excitation coil, a high-voltage coil, and a measurement winding (this winding is used only for equipment commissioning).
- Model: GTU-1200kVA/600kV
- Number of Phases: Single-phase
- Frequency: 50Hz
- Number of Stages: Single-stage
- Rated Input Excitation Voltage: 1000V
- Input Current: 1200 A
- Rated Output Voltage: 0–600 kV
- High-Voltage Output Current: 2 A
- Impedance Voltage: ≤15% (50 Hz)
- Partial Discharge Level: Less than 2 pC at 100% rated voltage;
- Less than 1 pC at 80% rated voltage;
- Waveform Distortion Rate: ≤3%
- Operating Time: 30 minutes at rated current; continuous operation at 2/3 rated current with coil temperature rise ≤55K
- Insulation medium: SF6
- Construction: The high-voltage, partial discharge-free test transformer is housed in a separate metal enclosure equipped with a gas filling port, pressure gauge, pressure relief valve, and terminal blocks. The high voltage is connected to the system's high-voltage GIS via bowl-type insulators and a current-limiting protective reactor.
- Insulation level: Withstands 1.1 times the rated voltage for one minute without any abnormalities.
Products FAQs
Q: What is the scope of application for this 600 kV test system?
A: It is suitable for factory testing of GIS systems rated at 252 kV and below.
Q: What are the partial discharge (PD) requirements for the entire system?
A: The partial discharge level of the entire system at rated voltage must be less than 2 pC; at 80% of rated voltage, it must be less than 1 pC.
Q: What are the sealing standards for the equipment gas compartments?
A: The annual leakage rate of each sealed gas compartment must be less than 0.5%.
Q: What items are included in the factory acceptance inspection of the equipment?
A: 1. Visual inspection; 2. SF6 seal leak test; 3. Turns ratio test; 4. DC resistance measurement of each winding; 5. External withstand voltage test; 6. Induced withstand voltage test; 7. Short-circuit impedance measurement; 8. System partial discharge measurement (≤2 pC for 10 minutes at 600 kV); 9. Waveform distortion measurement (<5%); 10. Measurement accuracy calibration (±1%).
Q: What is the production lead time for the equipment?
A: 45 working days after the technical agreement and commercial contract take effect.
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