Product Advantages
Precise OLTC Performance Testing
Measures transition resistance and transition time with high accuracy, providing reliable data for evaluating OLTC switching performance.
Flexible Test Current Selection
Four selectable test currents—2.0 A, 1.0 A, 0.5 A, and 0.2 A—cover different transition resistance measurement ranges.
Fast Dynamic Data Acquisition
The 20 kHz sampling rate enables the tester to capture rapid OLTC switching processes and analyze transient characteristics.
Reliable Fault Diagnosis
Test results can help identify abnormal transition resistance, excessive switching time, poor contact, and phase synchronization problems.
Portable & Field-Ready
The rugged case design and approximately 13 m standard test cable make the tester suitable for on-site testing in substations and transformer maintenance environments.
Efficient Data Management
Built-in data storage allows test results to be saved and reviewed, supporting equipment maintenance records and trend analysis.
Technical Specifications
| Model |
Specification |
| Product Type |
HYK-II / HYK-III |
| Applicable Equipment |
Transformer On-Load Tap Changer |
| Test Current |
2.0 A / 1.0 A / 0.5 A / 0.2 A |
| Transition Resistance Range |
0.3–5 Ω @ 2.0 A |
| |
1–20 Ω @ 1.0 A |
| |
5–40 Ω @ 0.5 A |
| |
20–100 Ω @ 0.2 A |
| Transition Time Range |
0–320 ms |
| Open-Circuit Voltage |
24 V |
| Transition Resistance Accuracy |
±(5% of reading + 0.1 Ω) |
| Transition Time Accuracy |
±(0.1% of reading + 0.2 ms) |
| Sampling Rate |
20 kHz |
| Data Storage |
Internal Storage |
| Main Unit Dimensions |
360 × 290 × 170 mm |
| Cable Case Dimensions |
360 × 290 × 170 mm |
| Main Unit Weight |
Approx. 6 kg |
| Cable Case Weight |
Approx. 4.5 kg |
| Standard Test Cable |
Approx. 13 m |
| Cable Length |
Customizable |
| Operating Temperature |
-10 to 50°C |
| Relative Humidity |
≤85% RH |
| Power Supply |
AC 220 V ±10% |
| Power Frequency |
50 ±1 Hz |
