1. Test item parameters and maximum test capacity
1. Power transformers (including grounding transformers)
Voltage level: 35 kV and below (rated 38.5 kV), including 35/20/10/6/0.8/0.69/0.4/0.23 kV
Capacity: 35 kV ≤ 5000 kVA, 20 kV ≤ 3000 kVA, 10 kV ≤ 2500 kVA; grounding transformers are available with or without low-voltage windings, with the maximum capacity of low-voltage windings being 800 kVA
Frequency: 50/60 Hz, induction testing at 100–200 Hz
Impedance voltage: 4%–12%
2. Arc-suppression coils
Voltage level: 10 kV (10.5/3 kV), 35 kV (38.5/3 kV)
Capacity: 10 kV ≤ 2000 kVA, 35 kV ≤ 2200 kVA
Taps / current regulation: tap-changing type with 9/14/19/25 taps (20%–110%), capacity-adjusting type with 16/32 taps (0%–110%), phase-controlled stepless regulation (0%–110%)
Frequency: 50/60 Hz, induction testing at 100–200 Hz
3. Dry-type iron-core series reactors
Voltage level: 10 kV and below (10.5 kV), including 10/6 kV
Capacity: 10 kV ≤ 1200 kvar; reactance rate: 5%–12%
Frequency: 50/60 Hz, induction testing at 100–200 Hz
2. Test items (power transformers / grounding transformers)
1. Winding DC resistance test
2. Turns ratio and connection group measurement (8 columns)
3. Insulation resistance test
4. Power-frequency withstand voltage test
5. No-load loss / current measurement, calculation of no-load current percentage, and no-load harmonic measurement
6. Load loss / short-circuit impedance measurement, standard temperature conversion (rated / maximum / minimum tap)
7. Zero-sequence impedance measurement (rated / maximum / minimum tap)
8. Induction withstand voltage test (noise-shielded room)
9. Partial discharge test (noise-shielded room, live background < 3 pC)
10. Noise test (noise-shielded room)
3. Project highlights
1. Comprehensive coverage of all product types: compatible with all categories of transformers, arc-suppression coils, and reactors up to 35 kV, precisely meeting customers’ core product testing needs
2. Compatibility with all test types: supports routine, type, and special tests, covering multiple specialized inspections to reduce costs and improve efficiency
3. Precise testing assurance: key tests are conducted in noise-shielded rooms, with partial discharge background < 3 pC, effectively isolating interference for accurate and reliable test data
4. Intelligent and efficient operation: automatic parameter collection and automatic temperature conversion, fully intelligent process that significantly shortens product testing cycles
5. Customized on-site fit: integrated layout of control room / equipment area / shielding room, perfectly matching customers’ existing production lines for convenient operation
6. Mature end-to-end service: well-established technical solutions and rapid implementation, providing integrated services of design, installation & commissioning, training, and operation & maintenance to ensure smooth and stable commissioning throughout the entire process
