AC Resonant Test System For Transformer Cable GIS

The HMCXZ-88kVA/44kV variable-frequency series resonance unit is primarily designed for AC withstand voltage testing of 10kV cross-linked cables, distribution transformers rated at 6,300kVA or less, current transformers, insulators, and high-voltage switches.

• Model/Capacity/Voltage HMCXZ-88kVA/44kV
• Rated Voltage 44kV (meets AC withstand voltage requirements for 63,000kVA power transformers, high-voltage switches, current transformers, and insulators)
• Output Voltage Waveform Distortion < 1.0%
• Permissible Continuous Operating Time 30 minutes of continuous operation under rated conditions; 60 minutes of continuous operation during cable withstand voltage testing
• Internal Power Factor Q > 50
• Cable Full-Load Power Factor Q > 30 (load-dependent)
• Input Power Single-phase 380V/220V
• Frequency Adjustment Range 30 Hz to 300 Hz
• System Measurement Accuracy 1.5%

• Variable-frequency power supply (4 kW)

Input: 220/380 V ±15%, 50 Hz; Output: 0–400 V, 30–300 Hz (0.1 Hz increments), Output current: 0–10 A.

• Reactors (2 units) (DK-44kVA/22kV)

Single unit: 22kV/2A, inductance 55H, dry-type construction, capable of sustained full load for 60 minutes, operating temperature rise <60°C.

• Excitation Transformer (4kVA)

Input: 220/380 V; Output: 1 kV/3 kV (two settings); Output current: 4 A (1 kV setting), 1.3 A (3 kV setting).

• Two capacitive voltage dividers

① 50 kV/1000 pF; ② 50 kV/15,000 pF, suitable for 30–300 Hz;