Your Professional AC Resonant Test System Supplier
Founded in 1992 and formally incorporated as Wuhan Moen Intelligent Electrical Co., Ltd. on November 12, 2012, with a registered capital of RMB 36 million, we are a professional technology company specializing in the research, development, and production of high-voltage test equipment. Our 8,000 m² facility in Wuhan East Lake High-Tech Development Zone houses dedicated production lines, R&D centers, and administrative facilities. With an experienced technical and production team, Moen focuses on core products including test transformers, series resonance systems, and other high-voltage testing equipment. Backed by years of industry experience, the company is committed to reliable manufacturing, continuous technical improvement, and providing practical solutions for global power utility and industrial customers.
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Portable Variable Frequency Resonance Test EquipmentExcellent for small-capacity samples like 10kV GIS and circuit breakers with built-in compensation capacitors for easier resonance. Strong and stable current ensures 35kV cable tests pass smoothly, -
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108kVA-54kV Variable Frequency Series Resonant Test SystemPerfect for daily construction team use. Wiring is simple and error-resistant; fast and stable performance for 10kV/35kV cables and sensitive protection for switches. Even new operators can work -
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Resonant Test System For Cable TestingThe MOEORW-WXB46 (88kVA-44kV) series resonant system is a high-voltage withstand voltage testing device designed for power maintenance and engineering units.Features include lightweight and efficient -
![44kVA 44kV Resonant Test System]()
44kVA 44kV Resonant Test SystemPerfect for small distribution stations, property rooms and industrial 10kV systems. Ultra-compact, energy-saving and compatible with 220V power; full protection and simple operation allow non-senior -
![640kVA 640kV AC Resonance Test System]()
640kVA 640kV AC Resonance Test SystemQ≥30, full load operation with standard site power supply1/10 weight of traditional equipment, easy single-person transportDistortion ＜1%, no mis-breakdown, zero repeated testsShort-circuit current -
![Series Resonant Test Set]()
Series Resonant Test SetMOEORW-W5606 108kVA/108kV Portable series resonant test set, widely used in 10kV/35kV power cable, high voltage switch and ring main unit withstand voltage test. Light modular structure, easy -
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Hv Resonant Test SystemGreat for urban emergency repair and routine preventive tests. Strong anti-interference ensures stable readings even in strong electric fields; comprehensive and sensitive protection shuts down -
![Lightweight Variable Frequency Resonant Systems]()
Lightweight Variable Frequency Resonant SystemsIdeal for 10kV cable tests in community distribution rooms and 35kV switch tests in outdoor ring cabinets. It is compact, quiet and easy to access narrow spaces; when breakdown occurs, the current -
![Variable Frequency Series Resonance Test Systems]()
Variable Frequency Series Resonance Test SystemsBuilt for ultra-high voltage and large-capacity projects including 110kV long cables, generators and full-substation tests. High power supports continuous long-time operation without overheating; -
![540kVA-270kV Series Resonance Test Device]()
540kVA-270kV Series Resonance Test DeviceIt delivers strong performance for high-end projects such as 110kV GIS and main transformers. Stable high-voltage output accurately locates insulation defects; powerful load capacity completes long -
![270kVA-270kV Series Resonance Test Device]()
270kVA-270kV Series Resonance Test DeviceOne unit covers 10kV, 35kV and 110kV tests. It provides stable high voltage for 110kV GIS and strong load capacity for 35kV cables. You don’t need multiple devices, reducing investment, space and -
![54kVA-54kV Series Resonance Test Device]()
54kVA-54kV Series Resonance Test DeviceFocusing on core high-voltage testing requirements, the MEXB-W54kVA/54kV unit employs resonant technology to optimize waveforms, delivering high Q-factor performance with no recovery overvoltage.
Why choose us
Our Certificate
We are certified in ISO 9001 (Quality), ISO 45001 (Health & Safety), and ISO 14001 (Environment), ensuring high standards in all aspects of our operations.
Strong R&D Capability
Committed to technological breakthroughs, including investments to develop 750kV reactor solutions.
Experienced Technical Team
A growing team of 61 employees supporting product development, production, and customer service.
Complete Pre & After-Sales Service
From solution design and technical support to installation, maintenance, and fast response service.
An AC resonant test system is a specialized high-voltage testing apparatus used to evaluate the insulation integrity and dielectric strength of electrical equipment such as cables, transformers, switchgear, and other power system components. These systems utilize resonance principles to generate high AC voltages efficiently with minimal input power, making them ideal for field testing and laboratory applications.
Product Parameter (specification)
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Overall System Parameters |
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Rated output capacity |
640 kVA |
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Max test voltage |
640 kV |
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Operating frequency |
20～300 Hz |
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Output waveform |
Standard sine wave, distortion ＜1% |
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Operation mode |
Continuous adjustable frequency resonance |
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Applicable capacitance |
0.005～0.5 μF |
Advantages of 640kVA 640kV AC Resonance Test System
High Sensitivity to Insulation Defects
AC resonant testing is highly sensitive to insulation defects, partial discharges, and weaknesses in the insulation system. This makes it effective for identifying potential issues in power apparatus.
Efficient and Quick Testing
AC resonant testing often requires shorter test durations compared to some other high-voltage testing methods, leading to more efficient testing processes.
Diagnostic Capability
AC resonant testing provides valuable diagnostic information, including resonance curves, partial discharge measurements, and other parameters that aid in understanding the condition of the insulation.
Applicability to High-Voltage Apparatus
Well-suited for testing high-voltage apparatus such as transformers, cables, reactors, and other components in power systems.
Frequency Selectivity
The ability to operate at a specific resonant frequency allows for frequency-selective testing, focusing on specific insulation properties and defects.
Reduced Electromagnetic Interference
The use of sinusoidal AC voltage in a controlled resonant condition can help reduce electromagnetic interference during testing.
Types Of 640kVA 640kV AC Resonance Test System
Series Resonance Systems
These systems use a series LC circuit configuration where the inductor (L) and capacitance (C) are connected in series with the test object. At resonance, the impedance is minimized, allowing high current flow and enabling voltage magnification across the test item.
Parallel Resonance Systems
In this configuration, the inductor and test capacitance are connected in parallel, forming a resonant tank circuit. The system reduces the required driving frequency and allows efficient testing of high-capacitance components by minimizing reactive power demand.
Hemi-Spherical Resonance Systems
A specialized design that uses a single capacitor and controlled resistance to achieve resonance at low frequencies. This compact system is engineered for high-voltage generation in confined spaces, often using hemi-spherical electrodes to optimize field distribution.
Portable AC Resonant Test Systems
Lightweight, mobile units designed for on-site testing. These systems often include integrated battery packs or support external power sources, enabling operation in remote or field locations without access to stable grid power.
Applications of 640kVA 640kV AC Resonance Test System
Power Generation: Used in thermal, hydro, and nuclear plants to test generator windings, transformers, and switchgear.
Transmission & Distribution (T&D): Utilities employ these systems to evaluate the insulation integrity of high-voltage cables, bushings, and substations.
Railway Electrification: Ensures the reliability of overhead catenary systems and traction transformers.
Renewable Energy: Solar farms and wind turbines use resonant testing to verify the condition of step-up transformers and underground cabling.
Industrial Manufacturing: Large factories with high-power motors and drives conduct routine dielectric testing to prevent unplanned outages.
Maintenance & Commissioning: Field service teams use portable resonant systems during equipment installation, repair, and preventive maintenance.
Installation Guide of 640kVA 640kV AC Resonance Test System
Choose a dry, level area with adequate ventilation and clearance around all components. Ensure proximity to a stable AC power source (typically 208–480 V, 50/60 Hz). Remove flammable materials and establish a safety perimeter to prevent unauthorized access during testing.
Assemble the reactor columns, excitation transformer, and control cabinet according to the manufacturer’s manual. Secure all modules using provided brackets and fasteners to prevent vibration-induced loosening during operation.
Connect the low-voltage input of the excitation transformer to the mains supply using appropriately rated cables. Verify polarity and phase sequence. Keep the main power switch OFF until all connections are confirmed.
Establish a robust grounding system using low-impedance copper cables. Bond all metallic parts—including the reactor frame, control cabinet, and test object—to a common earth point. Grounding minimizes touch potential and protects against insulation failure.
After assembly, perform a no-load test at low voltage to verify control functionality, meter readings, and communication between components. Check for abnormal noises, overheating, or error messages before proceeding to full operation.
Operating Procedures 640kVA 640kV AC Resonance Test System
Power On
Turn on the main power switch and allow the control system to initialize. Confirm that all indicators show normal status and that protective interlocks are engaged.
Parameter Setting
Input the required test voltage, frequency, and duration via the control panel. Select automatic resonance tuning mode if available. Double-check settings against the applicable standard (e.g., IEC 60502 for cables).
Load Connection
Connect the high-voltage output terminal to the test object using properly rated HV cables. Ensure the far end of the cable is isolated and grounded when not under test. Use safety barriers and warning signs to secure the test zone.
Testing Process
Initiate the test sequence. The system will automatically scan for resonance, apply the voltage ramp, and hold at the set level. Monitor real-time readings for current, voltage, and any anomalies. In case of breakdown or excessive leakage current, the system should trip automatically.
Routine Inspections: Conduct daily visual checks for damaged insulation, loose terminals, oil leaks (in oil-filled reactors), and corrosion. Inspect HV bushings and connectors for tracking or carbonization. Address minor issues immediately to avoid escalation.
Cleaning: Clean external surfaces with a dry or slightly damp cloth. Use compressed air to remove dust from cooling vents and internal compartments (only when powered off and discharged). Avoid water or solvents near electrical components.
Calibration
Perform annual calibration of voltage dividers, current sensors, and measuring instruments using accredited standards. Recalibrate after any major repair or impact event. Maintain a calibration log for audit purposes.
Part Replacement
Replace consumable parts such as fuses, cooling fans, and contactors as needed. Use only OEM-specified components to maintain system compatibility and safety certifications. Keep spares for critical items like control relays and HV connectors.
Software Updating
For digital control systems, install firmware updates released by the manufacturer to benefit from improved algorithms, enhanced diagnostics, and cybersecurity patches. Always back up configuration settings before updating.
Certificates
FAQ
As one of the most professional ac resonant test system manufacturers in China, we're featured by quality products and good price. Please rest assured to buy high quality ac resonant test system in stock here and get quotation from our factory. Customized orders are welcome.
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