HUAC-518A
Touch Screen CT/VT Analyzer
Automatic CT and VT analyzer: excitation, ratio, polarity, winding resistance and burden; knee points up to 60 kV by low-frequency method, under 9 kg.
IEC 61869IEC 60044-1IEC 60044-6
MODEL HUAC-4500
Portable CT/VT Ratio and Polarity Tester
Voltage-method CT and VT ratio and polarity tester: CTs up to 25000/5 A, VTs 2.2–220 kV, ±0.2 % of reading, no heavy-current source needed.
- Voltage method: no heavy-current generator needed, even for high-ratio CTs
- CTs from 5/5 A to 25000/5 A and 5/1 A to 5000/1 A
- VTs from 2.2 kV/√3 to 220 kV/√3 (100 V/√3 secondary)
- Accuracy ±0.2 % of reading with internal constant voltage source
- Clean internally generated test waveform, unaffected by grid interference
- Ratio shown directly, e.g. 20 for 100/5 A, no manual calculation
- Polarity shown as subtractive (correct) or additive (wrong)
- Large backlit LCD and reset button for quick re-measurement
- Lightweight and portable for field work
- English user interface; English operating system available
JJG 313-2010
Overview
The HUAC-4500 measures the turns ratio and polarity of current transformers (CTs) and voltage transformers (VTs) on site. It solves a common field problem: checking the ratio of a large CT by the current method needs a primary current of thousands or tens of thousands of amperes, which means a heavy current generator that is often impractical to bring to a substation.
Instead, the HUAC-4500 uses the voltage method. A single-chip processor generates a clean, pure test voltage internally, so readings are stable and unaffected by grid interference, and an internal constant voltage source keeps the accuracy at ±0.2 % of reading. It covers CTs from 5/5 A to 25000/5 A and from 5/1 A to 5000/1 A, and VTs from 2.2 kV/√3 to 220 kV/√3 with 100 V/√3 secondaries.
The backlit LCD shows the ratio directly, for example 20 for a 100/5 A CT, together with the polarity: subtractive (correct) or additive (wrong). A reset button starts the next measurement at once. The lightweight instrument is charged from AC 220 V and is easy to carry around substations, power plants and industrial sites for routine maintenance, commissioning and checks after winding replacement. The instrument meets the requirements of the Chinese verification regulation JJG 313-2010 for measuring current transformers.
See all CT and PT test equipment, or send us your instrument transformer data and we will recommend the right setup.
Technical specifications
| Measurement | |
|---|---|
| Principle | Voltage method, internally generated test waveform |
| CT range, 5 A secondary | 5/5 A to 25000/5 A |
| CT range, 1 A secondary | 5/1 A to 5000/1 A |
| VT range | 2.2 kV/√3 to 220 kV/√3 (100 V/√3 secondary) |
| Accuracy | ±0.2 % of reading |
| Polarity indication | Subtractive (correct) / additive (wrong) |
| General | |
| Display | Large backlit LCD |
| Power supply | AC 220 V ±10 %, 50 Hz (charging input) |
| Interface language | English |
| Compliance | JJG 313-2010 |
Specifications may change without notice. Contact us for the latest datasheet.
Applications
High-ratio CTs in substations and power plantsVoltage transformers up to 220 kVChecks after CT winding replacementIndustrial power systems
Downloads
The datasheet and user manual for this instrument are sent on request, usually within one business day.
Frequently asked questions
Why use the voltage method instead of the current method?
Testing a large CT by the current method needs thousands or tens of thousands of amperes on the primary side. The voltage method measures the same ratio with a small test voltage, so no heavy current generator is needed on site.
Which CTs and VTs can it test?
CTs from 5/5 A to 25000/5 A and from 5/1 A to 5000/1 A, and VTs from 2.2 kV/√3 to 220 kV/√3 with 100 V/√3 secondaries.
How is polarity shown?
The display shows whether the polarity is subtractive, which is correct, or additive, which indicates a wrong connection or marking.
Have another question? Ask our application engineers.
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Often ordered together
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CT/PT Analyzer with Variable Frequency and 50 A Current Source
Variable frequency CT/PT analyzer: excitation, error curves, ratio, polarity, burden and transient parameters, 50 A source, printer, 10,000 results.