Description
Technical Parameters
Products Description
product Overview
The HMCXZ-800kV/4000kVA variable-frequency series resonance test system is primarily used for AC withstand voltage testing of high-voltage electrical equipment, such as power transformers, GIS, power cables, circuit breakers, and insulators, at voltage levels of 800kV and below.
working principle
- Low power supply requirements: By utilizing the series resonance between the resonant reactor L and the test specimen's capacitance C, the power supply need only cover the system's active power losses (approximately 1/Q of the test capacitance). The higher the Q-factor, the lower the power supply requirements.
- Compact and lightweight: By eliminating the need for high-power voltage regulators and power-frequency test transformers, the weight and volume are approximately 1/10 to 1/30 that of conventional test equipment.
- High-quality output waveform: The resonant filter circuit produces a pure sine wave with a waveform distortion rate of ≤1%, preventing harmonic peaks from causing accidental breakdown of the test specimen.
- Fail-safe operation: When the test specimen breaks down, the circuit immediately detunes, and the short-circuit current rapidly drops to 1/Q of the normal test current, preventing damage to the breakdown point.
- No recovery overvoltage: After breakdown, the high voltage disappears immediately, the arc is extinguished, and there is no overvoltage surge.
Products Features
- High Voltage, High Capacity: Rated at 800 kV/4000 kVA, suitable for AC withstand voltage testing of 800 kV-class GIS, transformers, cables, and other equipment.
- Flexible Configuration: Four reactors can be connected in series (to increase voltage) or in parallel (to increase current). Combined with a multi-tap excitation transformer, this configuration meets various test voltage and current requirements.
- High Quality Factor: The measured Q-factor can reach 96 (in series configuration), far exceeding the standard requirement of ≥30, significantly reducing the capacity requirements for the input power supply.
- Low Noise: Operating noise ≤35 dB, suitable for indoor use or sites with noise restrictions.
- Comprehensive Protection: The frequency-converted power supply features protection functions against overvoltage, overcurrent, flashover, and power failure (overvoltage and overcurrent protection have been verified as functioning normally in test reports).
- High-Precision Measurement: The measurement error of the capacitive divider is ≤±0.5%, exceeding Class 1.5 requirements.
- Reliability Verification: All components undergo rigorous factory testing, including visual inspection, insulation resistance, DC resistance, inductance, withstand voltage, temperature rise (not explicitly stated but should be included), loss, and transformation ratio.
Technical Parameters
- Model HYXZ-800kV/4000kVA
- Rated Total Capacity 4000 kVA
- Rated Voltage 800 kV
- Rated Total Current 5 A
- Operating Frequency 30–300 Hz
- Reactor (Single Unit) 1000 kVA / 200 kV / 5 A, Inductance 50 H (±5%)
- Number of Reactors 4 units (can be configured in series or parallel)
- Excitation Transformer 180 kVA, Input 400 V, Output 5/10/35 kV
- Variable-frequency power supply 180 kW, input: 3-phase 380 V/50 Hz, output: 0–400 V, 30–300 Hz
- Capacitive voltage divider 800 kV / 1500 pF, accuracy class 1.5
- Quality factor (Q) ≥68 (measured at 261.6 Hz: Q=68)
- Noise Level ≤35 dB (measured)
- Insulation Resistance (Reactor) ≥2500 MΩ
- Factory Withstand Voltage Test Reactor: 200 kV/60 s passed; Excitation Transformer: Induced withstand voltage passed
- Voltage Divider Measurement Error ≤±0.5%
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