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-22/22-35kV
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.
- Real-time display of the frequency sweep curve
- Overcurrent and flashover protection
- Colour touch-screen LCD control
- Multiple operating modes
- Automatic frequency sweep to find resonance
- Lightweight, portable reactors for site work
IEC 60060-1DL/T 849.6
Overview
The HUAC-22/22-35kV is a variable frequency series resonant test system for AC withstand testing of 35 kV power cables, transformers, switchgear and other high-voltage equipment in substations, power plants and electrical laboratories.
A variable frequency power source drives an excitation transformer and a set of reactors connected in series with the test object. The control unit sweeps the frequency between 30 and 300 Hz until the reactor inductance resonates with the capacitance of the test object. At resonance the source only has to supply the circuit losses, so a compact power source can test highly capacitive loads such as long cable sections.
The multi-section reactors can be connected in series for higher test voltage or in parallel for higher test current, matching the system to each test object. The capacitive voltage divider measures the test voltage and also acts as compensation capacitance for objects with very low capacitance.
Typical system components
- Variable frequency power source with touch-screen control unit
- Excitation transformer
- Multi-section high-voltage reactors
- Capacitive voltage divider (measurement and compensation)
Testing 10 kV equipment? See the 10 kV series resonant test system.
Technical specifications
| General | |
|---|---|
| Model | HUAC-22/22-35kV |
| Rated voltage class | 35 kV |
| Output | |
| Frequency range | 30 – 300 Hz |
| Input | |
| Power supply | 220 – 380 V AC |
| Configuration | |
| Reactors | Multi-section, 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 |
| Physical | |
| Weight | Optimised for field portability |
Specifications may change without notice. Contact us for the latest datasheet.
Applications
35 kV power cablesPower transformersSwitchgearSubstations and power plantsElectrical test 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 35 kV equipment?
35 kV cables and large transformers draw 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. A test that would need a very large power-frequency test transformer can be done with a system that is transported to site.
Is a test frequency between 30 and 300 Hz accepted for cable testing?
Yes. International cable standards such as IEC 60502-2 and IEC 60840 allow after-installation AC voltage tests at frequencies from 20 to 300 Hz. The system automatically finds the resonant frequency for each test object within its 30–300 Hz range.
How are the reactors configured?
Connect the reactor sections in series to reach a higher test voltage, or in parallel to deliver more test current to a high-capacitance object such as a long cable. We calculate the configuration for your test objects before delivery.
How long a cable can the system test?
It depends on the cable capacitance per kilometre, the test voltage and the reactor configuration. Send us the cable length, cross-section and the required test voltage and duration, and we will confirm the configuration.
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.
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Get pricing for the 35 kV Variable Frequency Series Resonant Test System
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IEC 60060-1DL/T 849.6