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

1. Variable Frequency Power Supply
   Provides adjustable-frequency excitation power and allows precise control of the test frequency.
2. Excitation Transformer
   Matches the voltage and power requirements between the variable-frequency power supply and the resonant circuit.
3. Resonant Reactor
   Works together with the capacitive load to establish the series resonance condition and generate the required high AC test voltage.
4. Capacitive Voltage Divider
   Used for high-voltage measurement and monitoring during the test.
5. Control & Measurement System
   Provides system control, frequency adjustment, voltage monitoring and test operation management.

FAQ