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Resonant test system UHV-300kVA/100kV for cablesmodularon site
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Characteristics
- Test type
- resonant
- Applications
- for cables
- Configuration
- modular, on site
- Other characteristics
- automatic, precision, high-power
Description
Product Overview
Series Resonant System composition
Main features of Variable Frequency Series Resonant Test System
General Precautions of Variable Frequency Series Resonant Test System
Technical specifications
Application of Variable Frequency Series Resonance
- The UHV(L) AC series resonant withstand-voltage test system is engineered for AC withstand testing of hydro-generators up to 11 kV/30 MW and similar electrical equipment. It enables variable-frequency series resonance tests with adjustable inductance for precise, high-speed measurements using DSP-based control and integrated protection features.
Series Resonant System composition
- AC power source
- Excitation transformer
- High-voltage reactors (adjustable inductance)
- High-voltage divider
Main features of Variable Frequency Series Resonant Test System
- Reduced Power Capacity Requirement: Through resonance between the reactor and the test object, the power supply only needs to provide the active power loss, requiring only 1/Q of the test capacity, significantly lowering the required input power.
- Compact Size and Light Weight: Eliminates bulky voltage regulators and heavy power frequency test transformers. The resonant excitation power supply requires only 1/Q of the test capacity, reducing system weight and volume to 1/10–1/30 of conventional test equipment.
- Improved Output Waveform: Functions as a resonant filter, delivering a clean sine wave output and preventing insulation damage caused by harmonic peaks.
- Short-Circuit Current Limitation: In the event of insulation breakdown, the circuit immediately detunes, and the short-circuit current drops to 1/Q of the normal test current. This avoids large currents that could burn the fault point—a significant advantage over parallel resonance or conventional test transformers.
- No Recovery Overvoltage: After breakdown, resonance conditions are lost, causing the high voltage to disappear instantly. The voltage recovery process is slow, allowing ample time to disconnect power safely without generating dangerous recovery overvoltages.
General Precautions of Variable Frequency Series Resonant Test System
- Operate only by trained high-voltage test personnel after reading the manual and completing practical training
- At least two operators recommended; follow high-voltage safety procedures
- Comply strictly with applicable national standards and test procedures
- Do not connect cables incorrectly to avoid equipment damage
- Ensure reliable grounding and safe operation when outputs are at high voltage
Technical specifications
- Series/model: UHV(L)
- Typical application: AC withstand testing for hydro-generators ≤ 11 kV / ≤ 30 MW and similar equipment
- Main components: AC source, excitation transformer, HV reactors, HV divider
- Control: DSP platform
- Protections: overvoltage, overcurrent, zero-start, detuning/flashover
- Operation: multiple modes, variable frequency, adjustable inductance
Application of Variable Frequency Series Resonance
- The variable frequency series resonance test device is widely used in industries such as power, metallurgy, petroleum, and chemical engineering, and is suitable for high-capacity, high-voltage capacitive test samples such as generators, transformers, etc GIS、 Handover and preventive tests for high-voltage cross-linked cables, transformers, bushings, etc.
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Resonant Test System
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