Resonant Test Set
Our company has been specializing in the production and manufacturing of frequency series resonance devices for 21 years, with a modern intelligent factory covering over 4000 square meters and more than 100 automated production, manufacturing, assembly, and testing equipment. We have obtained CE certification and currently serve over 20,000 customers worldwide.
Our Resonant Test Set is a series resonance testing device that uses tuned inductors and load capacitors to generate power-frequency series resonance and obtain a power-frequency test voltage. It is widely used for AC withstand voltage testing of various high-voltage cross-linked cables, transformers, generators, GIS switches, motors, and SF6 switches. It serves as a complete set of instruments and equipment for frequency conversion, frequency modulation, and series resonance AC withstand voltage testing.
our service
Provide professional consulting,Integrity and fairness No matter great or small amount of contract, new or old customers, domestic or foreign customers, UHV treats with integrity and fairness. UHV provides professional installation, commissioning and training for users' workers, ensures that users can get familiar with operation methods and put machines into use as soon as possible.
our advantages
Quotation within 1 hour
Solution within 24 hours
Provide product demo
Perform contract strictly
Update production progress
Delivery on time
4000 square meters production plant
12 months warranty
Overseas training support
Regular return visit
Extended warranty (Optional)
Factory acceptable test
- Professional RD&QC
- Customize available
- Professional after-sales service team
- Authorized calibration (optional)
- Quality guaranteed
- A comprehensive after-sales service system
- High cost-effective products
- CE Certificate
- An enterprise that integrates scientific research, development, production, sales, and service
- 21 years experience in High Votlage Test equipment area
Serial product configuration
(Application range (10kV ~ 500kV voltage grade substation electrical equipment ac withstand voltage equipment, frequency 30 ~ 300Hz))
| Product model name | Variable frequency source | Resonant reactor | Exciter transformer | Voltage divider | Scope of application |
| UHV-50/50 | 4kW | 25kV/1A two(dry) | 4kVA(dry) | 50kV | 1000kVA and below 10kV power transformer. 10kV switch , bus, PT, CT, etc. 10 kv (300mm2) cable 1.0 km or less |
| UHV-108/108 | 6kW | 27kV/1A four(dry) | 6kVA(dry) | 110kV | 31500kVA and below 35kV power transformer. 35kV switch , bus, PT, CT, etc. 10 kv (300 mm2)cable≤2km.35kV (300mm2)cable≤0.5km |
| UHV-200/200 | 10kW | 50kV/1A four(dry) | 10kVA(dry) | 200kV | 50000kVA and below 110kV power transformer.110kVGIS、PT、CT etc.(Preventive test).35kV(300mm2)cable≤1.0km.10kV (300mm2)cable≤2.0km |
| UHV-270/270 | 15kW | 45kV/1A Six sets of(dry) | 15kVA(dry) | 300kV | 50000kVA and below 110kV power transformer.110kVGIS、PT、CT etc..35kV(300mm2)cable≤1.2km.10kV (300mm2)cable≤3.0km |
| UHV-800/400 | 30kW | 50kV/2A eight(dry); 100kV/2A four(oil-immersed) |
30kVA(dry); 30kVA(oil-immersed) |
400kV | 80000kVA and below 220kV power transformer.50000kVA and below 110kV power transformer.110kV/220kVGIS、PT、CT etc..35kV(300mm2)cable≤2.0km.110kV (300mm2)cable≤0.7km |
| UHV-1600/800 | 60kW | 200kV/2A four(oil-immersed) | 60kVA(dry) | 800kV | 220kV power transformer of 80000kVA and below.50000kVA and below 110kV power transformer.500kVGIS、PT、CT etc..220kV switch 、GIS、PT、CT etc..110kV(400mm2)cable≤1.5km.220kV (400mm2)cable≤1.0km |
Product Features
1. Our device includes protection functions such as overvoltage, overcurrent, zero start, and system detuning (flashover). Overvoltage and overcurrent protection values can be set according to user requirements. In case of a test sample flashover, the flashover protection is activated to protect the equipment.
2 .The entire device is lightweight and easy to use on-site.
3. The device offers three working modes, allowing users to flexibly choose based on on-site conditions to improve testing efficiency. The working modes include:
Fully automatic mode
Manual mode
Automatic tuning with manual boost mode
4.Data can be stored and printed at different locations, with numerical labels for easy identification and retrieval.
5. During automatic frequency scanning, the starting frequency can be set within a specified range. The scanning curve is displayed on the LCD screen, allowing users to intuitively determine whether the resonance point has been found.
6. Our device adopts DSP platform technology, making it easy to add or remove functions and upgrade according to user needs, ensuring a more user-friendly human-machine interface.
7. The operating interface supports multiple languages and allows easy switching. The default languages are Chinese and English, with options for customization.
8. The system includes a built-in series resonance parameter calculator, enabling quick one-click calculations of inductance, capacitance, frequency, resonant high voltage current, and cable capacitance.
Components of the Resonant Test Set
Series resonant devices are divided into frequency modulation, induction modulation, CVT, and non partial discharge types
Variable frequency power supply: Converts a 220V/380V, 50Hz power supply into an adjustable frequency and continuously adjustable voltage while integrating operation, protection, control, and monitoring functions.
Excitation transformer: Boosts the voltage output by the variable frequency power supply while isolating high and low voltage.
High-voltage reactor: Forms a series resonance circuit with the capacitive test sample.
Voltage divider: Measures the high-voltage and low-voltage values of the regulator.
Alternative Names for Resonant Test Set
This device is also referred to as:
ac resonant test
ac resonant test system
high voltage ac resonant test system
high voltage resonant test system
AC Resonant Test Set
Cable resonant test
Resonant Test Set
Resonance Test System
AC Resonance Test
Resonant Test System
Variable Frequency Resonant
Variable Frequency Resonant Test
CVT Resonance Test
Power Frequency Resonance Test
AC Resonance Test for CVT
Variable frequency series resonance AC voltage withstand test device
Series resonance test equipment
Cable voltage withstand test device
Power frequency voltage withstand test device
GIS AC voltage withstand test equipment
Portable cable AC voltage withstand test device
The Principle of Series Resonance?
By using an excitation transformer to excite a series resonant circuit and adjusting the output frequency of the variable frequency controller,
Generate series resonance between the inductor L and capacitor C.
The variable frequency controller provides power to the entire equipment and fixes the amplitude and frequency at 380V or Convert 220V sine AC power into AC power with adjustable amplitude and frequency.
Raise the output voltage of the variable frequency power supply to an appropriate voltage through an excitation transformer. High voltage reactor L
Series resonance occurs with sample C, and the resonance voltage is the voltage applied to sample C, that is, the sample Voltage testing can be achieved by adjusting the output voltage of the variable frequency power supply to measure the capac
Advantages of Series Resonance in Power Systems
Significant reduction in required power capacity
The series resonant power supply generates high voltage and high current through resonance between the resonant reactor and the test capacitor. The power supply only needs to provide the active power consumption of the system. The required power supply for the test is only 1/Q of the total test capacity.
Lighter and more compact equipment
The series resonant power supply eliminates the need for bulky high-power voltage regulators and conventional high-power test transformers. Additionally, the resonant excitation power supply requires only 1/Q of the test capacity, reducing system weight and volume to about 1/10 to 1/30 of conventional test devices.
Improved output voltage waveform
As a resonant filtering circuit, the device reduces waveform distortion, ensuring a pure sine waveform and preventing test sample breakdown due to harmonic peaks.
Prevents excessive short-circuit currents
In the event of a breakdown, the circuit immediately loses resonance, and the loop current rapidly decreases to 1/Q of the normal test current. Compared to other methods, series resonance significantly reduces short-circuit and breakdown current, effectively identifying insulation weaknesses without damaging the fault point.
No risk of overvoltage recovery
If the test sample fails, the resonance conditions are lost, causing the high voltage to immediately disappear and the arc to extinguish. Since the recovery voltage builds up slowly, it is easy to disconnect the power supply before reaching the flashover voltage again.
Main Applications of the Resonant Test Set
Series resonance is used in industries such as power, metallurgy, petroleum, and chemical, and is suitable for the handover and preventive testing of high-capacity, high-voltage capacitive specimens.
AC voltage withstand testing of 6kV-500kV power transformer GIS、 Substation capacitive equipment such as switches, busbars, bushings, and transformers
AC voltage withstand testing of 6kV-220kV high-voltage cross-linked cable
AC withstand voltage testing for Electric motors/generators with export voltage levels of 20kV and below
35kV , 66kV, 110kV ,22kV ,330kV ,500kV voltage level CVT boost calibration test
Resonance Testing Process
Frequency Scanning: The device scans a range of frequencies, applying excitation at each step. The scan typically starts from a low frequency and increases, but more complex scans may be used.
Response Measurement: As the frequency changes, the system’s response (amplitude, impedance, etc.) is measured. The results are displayed in a chart showing amplitude at each frequency.
Identifying Resonance: The resonance point is identified when the system’s response reaches its maximum amplitude, indicating the strongest vibration.
Analysis: The resonance frequency and amplitude are recorded. Further analysis can be performed to study damping (vibration attenuation rate) and other behaviors.
As one of the leading resonant test set manufacturers and suppliers in China, we warmly welcome you to buy high-grade resonant test set made in China here from our factory. For price consultation, contact us.
Resonance Test System, ac resonant test system, high voltage pressure test