Portable Modular Variable Frequency Series Resonance Test System with Automatic

The SXBP portable variable frequency series resonance test set is a high-voltage test equipment developed by our company to meet the demands of on-site AC withstand voltage tests in the power industry. Adopting the variable frequency resonance principle, it adjusts the output frequency to make the reactor resonate with the capacitance of the test object, so as to obtain stable high voltage on the test sample. It is suitable for AC withstand voltage tests of power cables, GIS, circuit breakers, instrument transformers, power transformers and other high-voltage equipment up to 110kV.

1. Portable Modular Design, Optimized for On-site Tests Adopting split modular structure, each component is packed and transported separately with light weight per module, convenient for transfer between substations, cable sites and laboratories. Compared with large fixed withstand voltage equipment, SXBP is ideal for engineering tests requiring frequent relocation.
2. Flexible Reactor Combination, One Set for Multiple Test Objects The resonant reactors are building-block type, which can be connected in series or parallel as required to adjust the output voltage and capacity of the system. One unit can cover tests for cables, GIS, circuit breakers, instrument transformers and transformers, maximizing equipment utilization rate.
3. High-quality Output Waveform for Reliable Test Results It outputs standard sine wave with low distortion, complying with waveform requirements for AC withstand voltage tests of high-voltage electrical equipment, minimizing test errors caused by waveform distortion and delivering stable and credible test results.
4. Automatic Test Function to Reduce On-site Operation Burden The SXBP series supports automatic frequency searching, automatic voltage regulation, automatic resonance point identification and automatic result saving. Operators only need to set relevant parameters, and the equipment will complete boosting, voltage holding and voltage reduction automatically, perfectly matching high-intensity on-site test work.
5. Multi-layer Safety Protection to Lower Test Risks Built-in overvoltage protection, overcurrent protection, flashover breakdown protection and zero-position start protection. Once the test sample breaks down or the system runs abnormally, the unit responds rapidly to cut off output and safeguard the equipment and test sample.

• AC withstand voltage test for 10kV, 35kV, 110kV power cables
• Withstand voltage test for GIS, circuit breakers, disconnectors and other high-voltage equipment up to 110kV
• AC withstand voltage test for current transformers and voltage transformers
• Induced withstand voltage or applied withstand voltage test for medium & small transformers and reactors
• Insulation withstand voltage test for generators, motors and other high-voltage equipment
• Substation handover test, preventive test, maintenance test and laboratory testing

Q1: What tests can the SXBP portable variable frequency series resonance set perform?
A: It is mainly used for AC withstand voltage tests of power cables, GIS, circuit breakers, instrument transformers, transformers, generators and motors up to 110kV, which is critical equipment to inspect insulation performance of high-voltage apparatus.
Q2: What is the difference between variable frequency series resonance test and traditional power frequency withstand voltage test?
A: Traditional power frequency withstand voltage equipment is bulky and heavy, inconvenient for field deployment. Variable frequency series resonance generates high voltage via resonance principle, with the strengths of small footprint, light weight, good waveform and high efficiency, more suitable for on-site tests.
Q3: What length of cable can this equipment test?
A: The maximum testable cable length depends on system capacity, voltage level, cable capacitance and test frequency range. We can configure suitable resonance schemes according to your cable voltage grade, cross-section and length.
Q4: Can the reactors be freely combined?
A: Yes. The reactors adopt building-block structure. They can be connected in series or parallel to adjust output voltage and load capacity to match different test samples.
Q5: What power supply is required on site?
A: It supports single-phase 220V or three-phase 380V. The actual power supply depends on equipment capacity and site conditions. 3-phase 380V is recommended for large-capacity units to guarantee stable power supply.