Product Overview & Applications
PD Free AC Resonant Test System Display Video
Products Description
Product Name: Variable Frequency Series Resonance Test System
Model Designation: HMCXZ-75kVA/75kV
Manufacturer: Wuhan Goldhome Hipot Electrical Co., Ltd.
Main Application: Primarily used for AC withstand voltage testing of 10kV cables; it can also be used for AC withstand voltage testing of 10kV/35kV power transformers, high-voltage switches, current transformers, insulators, and other equipment.
System Components: Variable-frequency control power supply, excitation transformer, reactors (3 units), capacitive voltage divider, test leads, and accessories.
Technical Specifications
- Rated Voltage: 75 kV
- Output Voltage Distortion: <1.0%
- Allowed Continuous Operating Time: 30 minutes under rated conditions; 60 minutes during cable withstand voltage testing
- Internal Quality Factor: Q > 50; Q > 30 during full-load cable testing
- Input Power: Single-phase 380 V/220 V
- Frequency adjustment range: 30 Hz to 300 Hz
- System measurement accuracy: 1.5%
- Protection functions: Overvoltage, overcurrent, zero-position start, etc.
- Power control cabinet: Rated power 4 kW, adjustable output 0–400 V, frequency 30–300 Hz (0.1 Hz steps)
- Reactors: 3 units, each 25 kV/1 A/90 H, continuous operation for 60 minutes
- Excitation transformer: 4 kVA, input 400 V/200 V, output 1.2 kV/2.4 kV
- Capacitive voltage divider: 1500 pF/75 kV
FAQs
Q: Can the reactor be placed on a metal floor?
A: No. During testing, the reactor must not be placed on a metal surface or a precast floor containing a metal mesh. Otherwise, the variable-frequency power supply may fail to find the resonance point, and eddy currents generated in the reactor may cause a decrease in Q-factor. In severe cases, intense eddy currents can cause a sharp rise in temperature, burning out the internal windings.
Q: How do I reset the equipment after a protection trip or fault?
A:Press the "Reset" button on the panel. If the device still cannot be reset or the fan does not start, disconnect the power supply, wait for a while, and then try again
Q: : Automatic tuning fails to complete, the resonance point cannot be found, and the tuning curve is a straight line. What should be done?
A:
Possible causes include poor circuit grounding, incorrect test circuit wiring, or an open circuit in one of the device's instruments.
Check whether the grounding device and grounding connection wires are disconnected;
Check the continuity of the excitation transformer's high- and low-voltage windings;
Check the continuity of each reactor;
Check the continuity of the voltage divider signal lines;
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