CT PT Analyzer
The ZWH101 is a highly automated, professional-grade diagnostic instrument for comprehensively testing Current Transformers (CT) and Potential Transformers (PT/VT).
Utilizing an advanced low-frequency testing principle, it can accurately measure knee point voltages up to 30KV while weighing less than 9kg, making it the ultimate tool for field testing.
Product Overview
Powered by a high-performance DSP and ARM processor architecture, the ZWH101 CT PT Analyzer is designed to meet the rigorous demands of power grid verification.
It supports a wide array of international standards including IEC60044, IEC61869, and IEEE C57.13. With its one-click operation, it automatically performs excitation, ratio, polarity, and secondary burden tests without requiring complicated manual setups.
Functions and Value:
1. Advanced Low-Frequency Technology: Employs a low-frequency measurement principle that allows the instrument to safely and accurately calculate high knee point voltages (up to 30KV) while outputting a maximum of only 180V.
2. Comprehensive CT/PT Coverage: Capable of testing Protection, Measurement, and TP class CTs, as well as electromagnetic PTs. It easily measures secondary winding resistance, volt-ampere characteristics, ratio error, and phase displacement.
3. Automatic Parameter Calculation: Instantly calculates critical transformer parameters including the 10% error curve, Accuracy Limit Factor (ALF), Instrument Security Factor (FS), second time constant (Ts), and remanence coefficient (Kr).
4. Extreme Portability: Weighing less than 9kg, this powerful analyzer is exceptionally easy to carry and operate by a single engineer in harsh substation environments.
5. Smart PC Software: Stores up to 2000 groups of test data internally. Users can export data via a USB disk to the included PC software, which allows for multiple curve comparisons and automatic generation of professional MS Word test reports.
6. User-Friendly Interface: Operates via a fully English graphic interface with a convenient “rotary mouse” (knob) input. A built-in thermal printer allows for immediate on-site record keeping.
Technical Details
| Parameter | Specification |
|---|---|
| Model | ZWH101 |
| Usage | Class P / TP CT and VT |
| Max Output | 0 ~ 180Vrms, 12Arms, 36A (peak value) |
| Voltage Measurement Accuracy | ± 0.1% |
| CT & PT Ratio Range | 1 ~ 40000 |
| CT Ratio Accuracy | ± 0.1% |
| PT Ratio Accuracy | ± 0.2% |
| Phase Measurement Range | ± 5 min |
| Phase Accuracy | 0.5 min |
| DC Resistance Range | 0 ~ 300 ohms (Accuracy: 2% ± 2m ohm) |
| Burden Range | 0 ~ 300 VA (Accuracy: 2% ± 0.2 VA) |
| Power Supply | AC 220V ± 10%, 50Hz/60Hz |
| Dimension | 340mm x 220mm x 330mm |
| Weight | Less than 9 kg |
Model Selection Guide
| Feature | ZW5320 | ZW8320 |
|---|---|---|
| Max Output Current | 20A | 20A |
| Max Resistance Range | Up to 200Ω | Up to 25kΩ (Includes 10mA, <1mA steps) |
| 3-Phase Auto Test | Supported | Supported |
| Auto Degaussing | Supported | Supported |
| Magnetic Assist | Not available | Supported |
| Best Application | Standard distribution & medium power transformers. | Large power transformers requiring rapid LV winding tests. |
Recent Work
Parts List
| Item NO. | Max Current | Measuring Range | Main Features | Recommended Application |
|---|---|---|---|---|
| GDZR-10A | 10A | 100μΩ - 20KΩ | Portable, built-in discharge alarm | Small to medium distribution transformers |
| GDZR-20A | 20A | 10μΩ - 10KΩ | High-speed testing, heat dissipation | Medium-sized power transformers |
| GDZR-40A | 40A | 1μΩ - 2KΩ | Dual-channel measurement, high current | Large-scale power transformers |
| GDZR-40A | Three-Phase 10A | 100μΩ - 10KΩ | Three-phase simultaneous measurement | Yn-type transformers, time-saving |
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Frequently Asked Questions
Contact our engineers for technical support and application guidance.
The device uses a proven low-frequency testing principle. By reducing the test frequency, the instrument ensures that the transformer core reaches the same magnetic flux density as it would at 50Hz/60Hz, allowing it to safely calculate knee points up to 30KV without generating dangerous high voltages.
The ZWH101 is highly versatile and supports testing for Measurement classes, Protection classes (P, PR, PX), and Transient protection classes (TPY, TPS, TPX, TPZ).
Yes. You can export all saved historical data to a USB flash drive. Using our complimentary PC operating software, you can view the data, compare up to 6 excitation curves simultaneously, and automatically generate a complete test report in Microsoft Word format.
No. The analyzer functions as a complete standalone unit. The LCD screen and rotary mouse allow you to set up tests, view data/curves, and print results directly from the machine’s built-in printer. The PC is only needed for post-test data management and report generation in the office.
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