HUAC-22/22-10kV
10 kV Variable Frequency Series Resonant Test System
AC withstand testing of 10 kV cables, switchgear and transformers, tuning to resonance anywhere from 30 to 300 Hz.
IEC 60060-1DL/T 849.6
MODEL HUAC-22/22-110kV/220kV
110 kV / 220 kV Variable Frequency Series Resonant Test System
AC withstand testing of 110 kV and 220 kV cables, transformers, GIS and transmission equipment, with modular reactors tuning to resonance from 30 to 300 Hz.
- Real-time display of the frequency sweep curve
- Overcurrent and flashover protection
- Colour touch-screen LCD control
- Multiple operating modes
- Automatic frequency sweep and resonance calculation
- Modular reactors for flexible voltage matching
IEC 60060-1DL/T 849.6
Overview
The HUAC-22/22-110kV/220kV is a variable frequency series resonant test system for AC withstand voltage and insulation tests on 110 kV and 220 kV power cables, transformers, GIS and transmission equipment in power plants, substations and high-voltage laboratories. It is built for the demands of extra-high-voltage testing under site conditions.
A variable frequency power source drives an excitation transformer and a stack of high-voltage reactors in series with the test object. The control unit sweeps the frequency between 30 and 300 Hz and calculates the resonant point automatically. At resonance the source only has to supply the circuit losses, so long, highly capacitive cable circuits at 110 kV and 220 kV can be tested without a large power-frequency test transformer.
The reactors are modular and can be connected in series for higher voltage or in parallel for higher current, matching the system to the voltage level and capacitance of each test object. The capacitive voltage divider measures the test voltage and also acts as compensation capacitance for low-capacitance objects.
Typical system components
- Variable frequency power source in a mobile control cabinet
- Excitation transformer
- Modular high-voltage reactors
- Capacitive voltage divider (measurement and compensation)
For lower voltage classes, see the 10 kV, 35 kV and 75 kVA / 75 kV series resonant test systems.
Technical specifications
| General | |
|---|---|
| Model | HUAC-22/22-110kV/220kV |
| Rated voltage class | 110 / 220 kV |
| Output | |
| Frequency range | 30 – 300 Hz |
| Configuration | |
| Reactors | Modular, multi-stage, series or parallel connection |
| Voltage divider | Dual function: measurement and compensation |
| Protection | |
| Protection functions | Overcurrent, flashover discharge |
| Control | |
| Display | Colour touch-screen LCD |
| Operating modes | Multiple selectable modes |
| Frequency tuning | Automatic sweep and resonance calculation |
Specifications may change without notice. Contact us for the latest datasheet.
Applications
110 kV and 220 kV power cablesPower transformersGISTransmission equipmentPower plants and substationsHigh-voltage laboratories
Downloads
The datasheet and user manual for this instrument are sent on request, usually within one business day.
Frequently asked questions
Why use series resonance for 110 kV and 220 kV cable testing?
A high-voltage cable circuit has a large capacitance and draws a high charging current at test voltage. In a resonant circuit the reactors supply that reactive power, so the power source only covers the losses. This makes on-site AC testing of long EHV cables practical with transportable equipment.
Is a test frequency between 30 and 300 Hz accepted?
Yes. IEC 60840 (up to 150 kV) and IEC 62067 (above 150 kV) allow after-installation AC voltage tests on cable systems at frequencies from 20 to 300 Hz. The system finds the resonant frequency for each test object within its 30–300 Hz range.
How is the system matched to different test objects?
The reactors are modular. Connect them in series to reach a higher test voltage, or in parallel to deliver more current for high-capacitance objects such as long cables. Send us the cable length, cross-section, test voltage and duration, and we will confirm the configuration.
Can it test GIS and transformers as well as cable?
Yes. Low-capacitance objects such as GIS or transformer windings may need extra capacitance to resonate within the frequency range; the voltage divider provides this compensation.
What protection does the system have?
The control unit trips on overcurrent and on flashover of the test object, so a breakdown is detected and the output is switched off immediately.
Have another question? Ask our application engineers.
Request a quote
Get pricing for the 110 kV / 220 kV Variable Frequency Series Resonant Test System
Tell us the asset ratings and site conditions. A sales engineer will reply with a recommendation and quotation.
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IEC 60270IEC TS 62478
HUAC-22/22-35kV
35 kV Variable Frequency Series Resonant Test System
AC withstand testing of 35 kV cables, transformers and switchgear, tuning to resonance anywhere from 30 to 300 Hz.
IEC 60060-1DL/T 849.6