Leading AC Resonant Test System Manufacturer
AC Resonant Test System is a popular method used to test high voltage cables, GIS, Swiches, generators, and transformers etc. The principle behind this method is adopts the way of adjusting the electric power frequency, which makes the reactor and the tested capacitor realize resonance, so as to obtain high voltage and high current on the tested object. Because of the small power required, the relatively light weight and small volume of the equipment, it has been widely praised and applied at home and abroad, which is a popular method and trend of high voltage test.Our company is a certified manufacturer of AC resonant test systems, and each set of AC resonant test devices we produce meets international standards.
Features of AC Resonant Withstand Voltage Test System
1. Excellent Electrical Performance
The circuit achieves excellent reactive power compensation under resonance, requiring only a small capacity of test power supply with high power utilization efficiency.
It outputs standard sinusoidal voltage waveform, fully complying with national standards for AC withstand voltage tests of high-voltage equipment.
Once breakdown or flashover occurs on the test object, the resonant circuit will detune automatically and the output voltage drops rapidly. No overvoltage will be generated, which effectively protects the test object and test systems
The AC resonant test system supports long-term continuous operation, meeting the requirements of long-duration withstand voltage tests for power cables, large transformers and other equipment.
2. Convenient On-site Application
Compact size and light weight make the equipment easy to transport and deploy, suitable for complex working sites such as outdoor areas, substations and construction sites
The AC resonant test system has a wide frequency modulation range and can realize accurate resonance matching for test objects with different capacitance values.
Simple wiring and easy commissioning; routine tests can be completed by a single operator.
3. High Safety & Environmental Friendliness
Low circuit current leads to less heat generation and low operating noise, creating a favorable working environment.
Equipped with multiple protection functions including overvoltage, overcurrent, flashover and earthing protection to ensure test safety.
It is a non-destructive testing method and will not damage the insulation of the tested equipment during operation.
4. Wide Application Scope
The AC resonant test system is widely used for AC withstand voltage tests of high-voltage electrical equipment, including power cables, power transformers, high-voltage motors, GIS equipment, high-voltage capacitors and switchgears.
Main Application Scenarios of AC Resonant Test System
Long distance power cables: The cable has a large capacitance and cannot be driven by traditional power frequency transformers. Series resonance is a necessary item for factory and handover testing.
GIS (gas insulated switchgear) and switchgear: detecting partial discharge and insulation defects.
Large generators/motors: Conduct voltage withstand tests to assess stator winding insulation.
High voltage transformers and bushings: verify insulation level.
Parameters of AC Resonant Withstand Voltage Test System
|
Rated Capacity |
2500kVA |
|
The input power |
Three phase 380V , frequency: 50Hz |
|
Rated Voltage |
600kV |
|
Rated current |
4.16A |
|
Working frequency |
30-300Hz |
|
Device output waveform |
Sine wave |
|
Waveform distortion rate |
Output voltage waveform distortion rate ≤1% |
|
Working time |
Continuous 60min is allowed under rated load; Overvoltage 1.1 times 1 min |
|
Temperature rise |
Temperature rise ≤65K after continuous operation under rated load for 60min |
|
The quality factor |
Device Q≥30(f=45Hz) |
|
Protection function |
Over current, over voltage and flashover protection (see frequency conversion power supply for details) |
|
Accuracy of measurement |
Effective value of the system is 1.5 |
|
Environment temperature |
－20oC-55oC |
|
Relative humidity |
≤90%RH |
|
The altitude |
≤3000m |
Components and parameters of AC Resonant Withstand Voltage Test System
HTXZ-150kW AC Power Source* 1 pc
|
Rated output capacity |
150kW |
|
Working power supply |
380±10%V (three-phase), power frequency |
|
The output voltage |
0-400V |
|
Rated input current |
375A |
|
Rated output current |
375A |
|
Voltage resolution |
0.01kV |
|
Accuracy of voltage measurement |
1.5% |
|
Frequency range |
20-300Hz |
|
Frequency regulation resolution |
≤0.1Hz |
|
Frequency stability |
0.1% |
|
Rising Temperature |
Continuous 60min at rated capacity, ≤65k |
|
Running time |
Continuous 60min at rated capacity |
|
Noise level |
≤50dB |
|
Dimension |
880×640×680mm |
|
Gross Weight |
125kg |
HTJL-150kVA/6/12/24kV/0.4kV Excitation Transformer*1pc
|
Rated Capacity |
150kVA |
|
The input voltage |
0-400V |
|
The output voltage |
6/12/24kV/0.4kV |
|
structure |
Oil type |
|
Dimension |
930×730×800mm |
|
Gross Weight |
585kg |
HTDK-832kVA/200kV High Voltage Reactor*3pc
|
Rated Capacity |
832kVA |
|
Rated Voltage |
200kV |
|
Rated Voltage |
4.16A |
|
inductance |
130H/single section |
|
The quality factor |
Q≥30(f=45Hz) |
|
structure |
Oil type |
|
Dimension (Inner Height) |
Diameter 900mm, High 1300mm |
|
Weight |
800kg |
HTFY-1000pF/600kV Capacity Divider*1 PC
|
Rated voltage |
600kV |
|
High piezoelectric capacity |
1000pF |
|
Dielectric loss |
tgσ≤0.5% |
|
Voltage division ratio |
7000：1 |
|
measurement accuracy |
Valid value of 1.5 |
|
Dimension (Inner Height) |
Single stage ∅200×1750, 2 stages in total |
|
Weight |
/ |
Advantages of Wuhan UHV Power Technology's AC Series Resonant test System
1. Self-developed Core Technology with Industry-leading Precision & Stability
The AC resonant test system equipped with DSP+FPGA dual-chip architecture and self-developed dynamic frequency tracking algorithm, achieving resonant frequency error ≤ ±0.05 Hz and response time ＜ 10 ms.
Measurement accuracy up to 0.05% and waveform distortion ≤ 1%, far exceeding national standards and avoiding misjudgment.
Built-in temperature-humidity adaptive algorithm, ensuring stable operation from -20℃ to 50℃ with error 30% lower than industry average.
2. High Energy Efficiency with Minimal Power Supply Demand
Under resonance, only active power loss is supplied; required power capacity is only 1/Q (Q≥30) of test capacity, reducing energy consumption by over 90% compared with traditional systems.
Operable on standard 220V/380V mains without dedicated high-power supply, offering excellent on-site adaptability.
3. Compact, Lightweight & Modular Design for Rapid Deployment
The total weight of AC resonant test system is 1/10～1/30 of conventional equipment; single module power 50 kVA with efficiency ＞ 95%.
Modular and vehicle-portable, suitable for field, substation and cable trench environments; one-person deployment possible.
4. Multi-level Safety Protection with Zero Damage to Test Objects
Four-fold protection: overvoltage, overcurrent, flashover and earth fault. Automatically detunes and drops voltage instantly upon breakdown, no recovery overvoltage generated.
Breakdown current is only 1/100 of conventional tests, avoiding fault-point burn and enabling accurate insulation defect localization.
5. Intelligent Automatic Operation with Fault Location & Cloud Reporting
Automatic resonance tracking, one-key boost and auto-stabilization without manual tuning.
Integrated cable fault location algorithm with ±0.2 m accuracy; cloud-based real-time report generation available via mobile phone.
6. Full Voltage Coverage & Wide Application Range
Customizable voltage from 25 kV to 10000 kV; one system for cables, transformers, GIS, motors and capacitors.
Complies with acceptance & preventive testing requirements for State Grid, renewable energy, rail transit, chemical and metallurgical industries.
7. Complete Qualifications, Reliable Quality & Comprehensive Service
National High-tech Enterprise, certified ISO, CE, CNAS with 20+ patents.
Fully self-developed and self-manufactured; 100% aging tested before delivery, supporting 60-minute continuous operation at rated load.
24 technical support, on-site commissioning and lifelong maintenance; successful projects both domestically and globally.
Application Scenarios and Image Examples
AC Resonant withstand voltage test for HV cable
AC Resonant withstand voltage test for main transformer
AC Resonant withstand voltage test for switchgear
FAQS
Q1: What is an AC resonant test system mainly used for?
A: It is professional high-voltage test equipment for AC withstand voltage testing. It is widely used to inspect the insulation performance of power cables, transformers, GIS, high-voltage motors, capacitors, switchgears and other high-voltage electrical equipment, to find insulation defects such as voids, cracks and delamination.
Q2: How to choose the proper voltage and power rating for my project?
A: Please confirm three key parameters: the maximum test voltage of the test object, the total capacitance of the tested equipment, and the required test frequency. Our technical team will recommend the matched model according to your working conditions.
Q3: What safety protection functions does the system have?
A: It is equipped with complete protection functions including overvoltage protection, overcurrent protection, flashover protection, earthing protection and emergency stop. All safety interlocks comply with high-voltage operation safety regulations.
Q4: Do you have relevant international certifications for export business?
A: Our products have passed ISO quality system certification, CE certification and other international certifications, and comply with relevant standards for export to global markets. Complete certification documents can be provided.
Q5: What is your warranty period?
A: We provide 1 year free warranty for the whole set of equipment, and lifelong technical support and maintenance service. Spare parts are supplied at cost price after the warranty period.
Q6: What is the packaging method and delivery cycle?
A: Standard export wooden box packaging, moisture-proof and shockproof. Normal delivery cycle is 25~35 working days after receiving deposit(pls have a check withour salers). We support sea freight, air freight and land transportation.
Q7: Can you provide on-site commissioning and training service?
A: Yes. We can arrange professional engineers for on-site equipment commissioning, operation training and technical guidance according to customer requirements.
As a qualified supplier of AC resonance test devices, we have competitive prices for AC resonance test devices and provide fast technical support, online guidance from engineers, and on-site calibration services. Our global logistics network ensures the safe delivery of resonance devices to your site. Contact us to provide you with customized solutions.
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