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-22/22-75kVA/75kV
75 kVA / 75 kV Variable Frequency Series Resonant Test System
75 kVA resonant test system for AC withstand and partial discharge tests on cables, transformers, GIS and generators, with 25 kV / 3 A or 75 kV / 1 A output.
- Real-time display of the frequency sweep curve
- Overcurrent, overvoltage and flashover protection
- Colour touch-screen LCD control
- Multiple operating modes
- Automatic frequency sweep to find resonance
- Lightweight, stackable reactor sections for site work
IEC 60060-1DL/T 849.6
Overview
The HUAC-22/22-75kVA/75kV is a variable frequency series resonant test system for AC withstand voltage and partial discharge tests on power cables, transformers, GIS and generators in power plants, substations and electrical laboratories.
The variable frequency power source drives an excitation transformer and a reactor stack in series with the test object, and the control unit sweeps between 30 and 300 Hz to find resonance. At resonance the source only supplies the circuit losses; with a quality factor of Q ≥ 30, a 75 kVA test is run from a single-phase 220 V or three-phase 380 V supply.
The reactor sections are connected in series for 75 kV at 1 A, or in parallel for 25 kV at 3 A, so the same system covers both high-voltage, low-capacitance objects and lower-voltage, high-capacitance objects such as long cables. The output is a sine wave with distortion of 1 % or less, which also makes the system suitable as the voltage source for partial discharge measurements.
Typical system components
- Variable frequency power source with touch-screen control unit
- Excitation transformer
- Stackable high-voltage reactor sections
- Capacitive voltage divider (measurement and compensation)
For smaller test objects, see the 10 kV and 35 kV series resonant test systems. For 110 kV and 220 kV equipment, see the 110 kV / 220 kV system.
Technical specifications
| General | |
|---|---|
| Model | HUAC-22/22-75kVA/75kV |
| Rated capacity | 75 kVA |
| Input | |
| Power supply | Single-phase 220 V or three-phase 380 V, 50 Hz |
| Output | |
| Rated voltage | 25 / 75 kV |
| Rated current | 3 / 1 A |
| Frequency range | 30 – 300 Hz |
| Output waveform | Sine wave |
| Waveform distortion | ≤ 1 % |
| Duty | |
| Working time | 5 min continuous at rated load; 1.1 × rated voltage for 1 min |
| Temperature rise | ≤ 65 K after 5 min at rated load |
| Performance | |
| Quality factor | Q ≥ 30 (at f = 45 Hz) |
| Measurement accuracy | Class 1.5 (r.m.s.) |
| Protection | |
| Protection functions | Overcurrent, overvoltage and flashover protection of the test object |
Specifications may change without notice. Contact us for the latest datasheet.
Applications
Power cablesPower transformersGISGeneratorsPartial discharge testsElectrical test laboratories
Downloads
The datasheet and user manual for this instrument are sent on request, usually within one business day.
Frequently asked questions
What is the difference between the 25 kV / 3 A and 75 kV / 1 A outputs?
Both use the same 75 kVA rating. Connect the reactor sections in series for 75 kV at 1 A when the test object needs a high voltage and has low capacitance, or in parallel for 25 kV at 3 A when it needs more current, for example a long cable.
Can it be used for partial discharge testing?
Yes. The output is a sine wave with distortion of 1 % or less, so the system can serve as the AC voltage source for partial discharge measurements, used together with a PD measuring system and coupling capacitor.
What power supply does it need on site?
Single-phase 220 V or three-phase 380 V at 50 Hz. Because the resonant circuit has a quality factor of Q ≥ 30, the supply only has to cover the circuit losses, not the full 75 kVA.
How long can the system run at full load?
It is rated for 5 minutes continuous operation at rated load, and for 1.1 times rated voltage for 1 minute, with a temperature rise of 65 K or less.
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.
Have another question? Ask our application engineers.
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IEC 60270IEC TS 62478
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.
IEC 60060-1DL/T 849.6