Product Description
The SXBP Variable Frequency Series Resonance Test System is a high-voltage AC withstand testing system designed for power equipment rated at 110 kV and below. Using advanced variable-frequency series resonance technology, the system provides stable and adjustable high-voltage AC output for dielectric withstand testing. It is suitable for field and laboratory testing of power cables, transformers, GIS, circuit breakers, CTs, PTs and other high-voltage electrical equipment.
Key Features
- Up to 800 kV AC output voltage depending on configuration
- Variable-frequency output from 20 to 300 Hz
- Sine-wave output with waveform distortion ≤1%
- Fine frequency adjustment down to 0.01 Hz
- Frequency stability ≤0.01%
- Suitable for continuous high-voltage AC withstand testing
- Modular system configuration for different test requirements
- Suitable for both field and laboratory applications
- Supports single-phase 220 V or three-phase 380 V power supply
- High system quality factor for efficient resonance operation
- Compact and flexible system design for practical field testing
Typical Test Applications
- Power Cables
- 10 kV cables
- 35 kV cables
- 110 kV cables
- Other medium- and high-voltage cables
- Power Transformers
- Transformer AC withstand testing
- Insulation withstand testing
- High-voltage dielectric testing
- GIS & Switchgear
- GIS withstand testing
- Circuit breaker testing
- Switchgear insulation testing
- Instrument Transformers
- Current transformers (CT)
- Voltage transformers (VT/PT)
- Other High-Voltage Equipment
- Insulators
- Busbars
- Electrical components and assemblies requiring AC withstand testing
Main Components
- Variable Frequency Power Supply
Provides adjustable-frequency excitation power and allows precise control of the test frequency.
- Excitation Transformer
Matches the voltage and power requirements between the variable-frequency power supply and the resonant circuit.
- Resonant Reactor
Works together with the capacitive load to establish the series resonance condition and generate the required high AC test voltage.
- Capacitive Voltage Divider
Used for high-voltage measurement and monitoring during the test.
- Control & Measurement System
Provides system control, frequency adjustment, voltage monitoring and test operation management.
FAQ
1. What is a Variable Frequency Series Resonance Test System?
A Variable Frequency Series Resonance Test System is high-voltage AC test equipment that uses series resonance technology to generate stable high AC voltage for dielectric withstand testing. It is widely used for testing power cables, transformers, GIS, switchgear, CTs, PTs and other high-voltage electrical equipment.
2. What equipment can be tested with this system?
The system can be used for AC withstand testing of various electrical equipment, including:
• Power cables
• Power transformers
• GIS
• Circuit breakers
• Switchgear
• Current transformers (CT)
• Voltage transformers (VT/PT)
• Insulators
• Other high-voltage electrical equipment
The actual system configuration depends on the voltage and capacitance of the test object.
3. What is the maximum output voltage?
The system can be configured with an output voltage of up to 800 kV RMS, depending on the specific system configuration and testing requirements.
The required test voltage should be confirmed according to the test object and applicable testing standard.
4. What is the output frequency range?
The standard frequency range shown for the system is 20–300 Hz.
Variable-frequency operation allows the system to adjust the resonance point according to the characteristics of different test objects.
5. Why does the system use variable-frequency technology?
Different test objects have different capacitance values. Variable-frequency technology allows the operator to adjust the operating frequency to establish the appropriate resonance condition.
This makes the system more flexible for testing cables, transformers, GIS and other capacitive loads.
