Portable Dry Type Variable Frequency Resonance Hipot Test Equipment For Substation On Site High Voltage Withstand Test

The SXBP portable variable frequency series resonance test system is a high-voltage AC withstand testing solution designed for electrical equipment up to 110kV. Based on advanced series resonance technology, it provides stable and efficient high-voltage output while significantly reducing the required power supply capacity for field testing.

The system adopts dry-type epoxy casting insulation technology for reactors and excitation transformers, ensuring a compact design, lightweight structure and excellent environmental adaptability. With modular reactor configuration and flexible series/parallel connection modes, a single system can meet various AC withstand voltage testing requirements for transformers, GIS, circuit breakers, high-voltage bushings, XLPE cables, generators and motors.

Designed for mobile field applications, the SXBP series is widely used in substation maintenance, power project commissioning, preventive insulation testing and electrical equipment factory acceptance tests, offering a practical solution for high-voltage test engineers.

High-Voltage Cable Testing:
Designed for AC withstand voltage testing of 10kV, 35kV and 110kV XLPE insulated power cables, verifying cable insulation performance before commissioning and during maintenance.

Primary Power Equipment Testing:
Suitable for insulation withstand tests of 110kV and below high-voltage equipment, including GIS, circuit breakers, CT/PT, power transformers and other substation primary equipment.

Rotating Equipment Testing:
Applied for AC insulation withstand voltage tests of medium and small-sized generators, high-voltage motors and other rotating electrical equipment to ensure reliable operation.

Designed with lightweight modular components, each unit is controlled below 50kg, allowing convenient handling by one or two operators. The compact design is suitable for on-site testing in remote areas, cable trenches, and confined substation environments, reducing installation time and labor requirements.

The reactor system adopts a modular configuration that supports flexible series and parallel connection. According to different voltage levels and capacitive loads of test objects, the system can be quickly configured for various applications, including power cables and high-voltage electrical equipment.

With an adjustable frequency range of 30Hz–300Hz, the system applies variable frequency resonance technology to achieve high-voltage output with lower power input requirements. It can perform large-capacity AC withstand tests using standard field power supplies.

The system provides a pure sinusoidal high-voltage output with waveform distortion controlled within 1%. Stable waveform quality ensures reliable test results and compliance with relevant AC withstand voltage testing standards.

The equipment features clear wiring identification and optimized circuit design. Technicians can complete connection and operation efficiently based on standard wiring diagrams, improving field testing efficiency.

Integrated intelligent control technology enables automatic voltage regulation, frequency adjustment and test process management. Comprehensive protection functions such as overvoltage, overcurrent, overheating, flashover and resonance deviation protection enhance operational safety.

The built-in data storage system records key test parameters, voltage curves and fault information. Historical data can be reviewed and exported for test reports, acceptance records and maintenance analysis.

A Variable Frequency Series Resonance Test System is an advanced high-voltage AC testing solution designed to perform insulation withstand tests on large-capacity electrical equipment.

The system applies resonance compensation technology by tuning the test frequency to match the inductive reactance of the reactor with the capacitive characteristics of the test object. This enables the generation of high-voltage AC output with reduced power requirements while maintaining stable testing performance.

It is commonly applied in the field testing and commissioning of high-voltage cables, GIS, transformers, switchgear and other power equipment.

The portable variable frequency series resonance system is suitable for AC withstand voltage testing of various high-voltage electrical equipment, including:

• Medium and high-voltage power cables (10kV, 35kV, 110kV and above)
• GIS (Gas Insulated Switchgear)
• High-voltage circuit breakers
• Current transformers (CT) and voltage transformers (PT/VT)
• Power transformers
• High-voltage busbar systems
• Motors and generators

It can be used for factory acceptance tests, installation commissioning, preventive maintenance inspections and field diagnostic testing.

A complete system generally includes:

• Variable frequency control power source
• Excitation transformer
• Resonance reactors
• Capacitive voltage divider
• Measurement and protection system
• High-voltage connection accessories

The modular reactor design enables different series or parallel combinations, allowing the system to adapt to various voltage ratings and load capacities.

Key advantages include:

Reduced power supply capacity
Resonance compensation technology minimizes the input power requirement during high-voltage AC testing.

Easy transportation and field deployment
The lightweight modular structure allows convenient transportation and installation at substations, cable tunnels and construction sites.

Reliable voltage output quality
The system provides a stable output waveform with distortion ≤1%, ensuring compliance with AC withstand voltage testing requirements.

Flexible test configuration
Reactor modules can be assembled according to different test voltage levels and test object capacitance.

Strong environmental adaptability
The system maintains stable operation under complex electromagnetic conditions.

User-friendly operation
The intelligent control interface simplifies parameter setting and improves testing efficiency.

The variable frequency series resonance system supports a test frequency range of:

30Hz～300Hz

The adjustable frequency range allows accurate resonance matching for different capacitive loads, ensuring efficient and stable AC withstand voltage testing.