Partial Discharge Free Series Resonance Test System High Voltage Withstand & PD Tester for GIS & Power Transformer Power Frequency AC Resonance Test Equipment
Product Introduction
The SXJF partial discharge free series resonance test device adopts the frequency & voltage regulation mode to conduct AC withstand voltage tests and partial discharge (PD) tests. Frequency adjustment can be realized online without power cut.
Equipped with a partial discharge free power frequency test transformer, this equipment is mainly used to verify the power frequency withstand voltage insulation performance of various insulating materials, insulation structures and electrical products. Meanwhile, it serves as a dedicated partial-discharge-free power frequency test power supply for transformers, instrument transformers, lightning arresters and other high-voltage test objects.
Widely applied in electrical manufacturing enterprises, power operation departments, scientific research institutions and universities for high voltage insulation inspection, factory type tests, handover tests and preventive tests.
Product Features
- Complete supporting configuration & full series capacity
The complete set boasts strong matching performance with full-range voltage & capacity specifications and comprehensive built-in functions. It meets test requirements from low-voltage samples up to 750kV & 1200kV high-voltage equipment with flexible model selection.
- Low system impedance, compliant with rigorous test standards
Low impedance voltage with total system impedance ≤5%. The pure waveform meets strict requirements of AC pollution tests and partial discharge tests, delivering low background PD value and accurate test data.
- Fast electronic protection for high operational reliability
Equipped with high-speed electronic protection modules against overvoltage, overcurrent, flashover and sample breakdown. It cuts off output immediately once faults occur to protect both test samples and the host device, ensuring long-term stable & safe operation.
- Integrated frequency & voltage regulation for easy field operation
Online parameter adjustment without power outage and wiring disassembly greatly shortens test working hours, suitable for field tests at substations, construction sites and factory routine inspection.
- Standard sine wave output with tiny test error
Pure standard sine wave output eliminates harmonic interference to PD data acquisition, ensuring authentic & effective partial discharge measurement results in line with domestic and international power grid test standards.
Product Structure
The whole system consists of a frequency conversion control cabinet, partial-discharge-free excitation transformer and high voltage resonant reactor. The control cabinet adopts sealed heat dissipation structure with good dust-proof and cooling performance. The partial-discharge-free main body is made with high-quality insulated casting process to strictly control partial discharge level. The solid structure supports long-term intensive test operation.
Technical Specifications
Three-phase Technical Parameters
| Item |
Technical Index |
| Rated Input Voltage |
3-phase AC 380V ±10%, 50Hz |
| 3-phase Rated Output Line Voltage |
0 ~ 320V continuously adjustable; phase angle difference: 120° ±1° |
| 3-phase Rated Output Current |
18 ~ 902A |
| 3-phase Rated Output Power |
10 ~ 500kW |
| Frequency Adjustment Range |
20 ~ 300Hz |
| Output Waveform |
Standard sine wave |
Single-phase Technical Parameters
| Item |
Technical Index |
| Rated Input Voltage |
3-phase AC 380V ±10%, 50Hz |
| Output Phase |
Phase A & Phase C |
| Single-phase Rated Output Voltage |
0 ~ 350V (output via Phase A and C) |
| Single-phase Rated Output Power |
5.7 ~ 288kW |
FAQ
Q1: What is a Partial Discharge Free Series Resonance Test System?
A:A Partial Discharge Free Series Resonance Test System is a high-voltage AC testing system that uses variable frequency resonance technology to generate stable high-voltage output for insulation withstand and partial discharge tests.
By adjusting the output frequency to achieve resonance between the reactor and capacitive load, the system can provide high test voltage with lower power consumption and reduced requirements on the input power supply.
Q2: What applications can this system be used for?
A:The SXJF series resonance test system is mainly applied for:
- AC withstand voltage testing of high-voltage transformers, reactors and GIS equipment.
- Partial discharge testing of high-voltage insulation systems.
- Insulation performance evaluation of transformers, bushings, CT/PT and other power equipment.
- Laboratory and field tests for power utilities, research institutes and universities.
Q3: What are the advantages of using series resonance technology?
A:Series resonance technology offers several advantages:
- Lower input power requirement: Resonance increases voltage output efficiency, reducing the capacity requirement of the test power supply.
- Stable high-voltage output: Provides a clean sine waveform suitable for insulation testing.
- Flexible frequency adjustment: Allows frequency tuning according to different test objects.
- Suitable for large-capacitance loads: Ideal for cables, GIS and other high-voltage equipment with large capacitive characteristics.
Q4: What voltage and frequency range does the system support?
A:According to different configurations, the SXJF system supports:
- Output frequency range: 20Hz–300Hz
- Three-phase output voltage: 0–320V continuously adjustable
- Single-phase output voltage: 0–350V continuously adjustable
- Rated output power range: 5.7kW–500kW
Customized configurations are available according to specific test requirements.
Q5: Can this system perform both withstand voltage and partial discharge tests?
A:Yes. The SXJF system is designed for both:
- AC withstand voltage testing to verify insulation strength.
- Partial discharge measurement to detect insulation defects such as voids, cracks and local insulation degradation.
It is widely used for quality inspection, preventive maintenance and commissioning tests of high-voltage equipment.
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