Xi'an Xu&Hui Electromechanical Technology Co., Ltd.
| Transition Resistance Range | 0.3 to 100 ohm |
| Sampling Rate | 20kHz |
| Interfaces | RS232 USB and Printer |
| Payment Terms | T/T |
| Supply Ability | 3000unit/year |
| Delivery Time | 5-8 work days |
| Packaging Details | wooden packaging |
| Ambient Humidity | Up to 85 Percent RH |
| Resistance Accuracy | Plus Minus 5 Percent Reading |
| Operating Mode | Timed or continuous operation |
| Power Frequency | 50Hz Plus Minus 1Hz |
| Supported Transformers | YN Y and Delta Types |
| Open Circuit Voltage | 24V |
| Working Power | AC220V Plus Minus 10 Percent |
| Output Current | 1.0A 0.5A 0.2A |
| Display | 7-inch High Brightness LCD |
| Transition Time Range | 0 to 320 ms |
| Time Accuracy | Plus Minus 0.1 Percent Reading |
| Ambient Temperature | Minus 10C to 50C |
| Storage | 500 Data Groups |
| Test Functions | Transition Waveform Time Resistance Synchronism |
| Brand Name | XZH TEST |
| Model Number | XHYZ1668 |
| Certification | ISO CE |
| Place of Origin | Xi'an Shaanxi China |
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Product Specification
| Transition Resistance Range | 0.3 to 100 ohm | Sampling Rate | 20kHz |
| Interfaces | RS232 USB and Printer | Payment Terms | T/T |
| Supply Ability | 3000unit/year | Delivery Time | 5-8 work days |
| Packaging Details | wooden packaging | Ambient Humidity | Up to 85 Percent RH |
| Resistance Accuracy | Plus Minus 5 Percent Reading | Operating Mode | Timed or continuous operation |
| Power Frequency | 50Hz Plus Minus 1Hz | Supported Transformers | YN Y and Delta Types |
| Open Circuit Voltage | 24V | Working Power | AC220V Plus Minus 10 Percent |
| Output Current | 1.0A 0.5A 0.2A | Display | 7-inch High Brightness LCD |
| Transition Time Range | 0 to 320 ms | Time Accuracy | Plus Minus 0.1 Percent Reading |
| Ambient Temperature | Minus 10C to 50C | Storage | 500 Data Groups |
| Test Functions | Transition Waveform Time Resistance Synchronism | Brand Name | XZH TEST |
| Model Number | XHYZ1668 | Certification | ISO CE |
| Place of Origin | Xi'an Shaanxi China | ||
| High Light | Transition Waveform Time and Resistance ，Works With or Without Windings ，Stores 500 Groups of Data | ||
XHYZ1668 On-Load Tap Changer Waveform & Transition Resistance Tester — a portable instrument that measures the transition waveform, transition time, instantaneous transition resistance and three-phase synchronism of transformer on-load tap changers.
The on-load tap changer is the only moving part connected to the transformer circuit, so its testing has drawn increasing attention. The applicable handover and preventive test regulations require checking the operating sequence of on-load tap changers and measuring the switching time. The XHYZ1668 is designed for exactly this work: measuring the transition waveform, transition time, instantaneous transition resistance and three-phase synchronism of transformer on-load tap changers.
With a high degree of intelligence, full Chinese menu prompts and simple operation, the instrument is small and light with strong anti-interference capability. It greatly reduces the labour intensity of on-site staff and is an ideal instrument for power generation and supply units and the transformer manufacturing industry to safeguard production and improve product quality.
Key FeaturesThe tap changer operates in the sequence a–g, and a healthy operation produces a standard waveform. The instrument identifies the key points on that waveform so the operator can judge the changer’s condition:
| Symbol | Meaning |
|---|---|
| R0 | Winding resistance and test-lead resistance |
| R1 | Transition resistance 1 |
| R2 | Transition resistance 2 |
| T0 | Three-phase synchronism, based on the phase first detected switching |
| T1 | Operating time of transition resistance 1 |
| T2 | Bridging time |
| T3 | Operating time of transition resistance 2 |
| T4 | Transition time |
Typical waveform problems and what they point to, as analysed in the manual: an over-long pre-bridging time (for example about 50 ms, roughly three times normal) on all three phases usually indicates an ageing energy-storage spring in the fast mechanism; a symmetrical zero-crossing segment with a transition resistance far above 50 Ω points to a defective transition resistance; and a corrupted phase waveform reading only 0.3–0.5 Ω can indicate a broken strand in the phase’s flexible connection shorting the transition resistance.
Two Test Modes| Mode | Connection | Notes |
|---|---|---|
| With winding | Test clamps on the regulating side bushes (A, B, C and neutral); the non-test end (usually MV and LV sides) is three-phase shorted to ground. | Winding and switch are charged first, so the curve rises gradually; the action time is longer. |
| Without winding | Clamps to X1(A1), Y1(B1), Z1(C1), shorted across to X2(A2), Y2(B2), Z2(C2); black clamp to neutral. | Compared with a with-winding test, the operation time is shorter — about 3–7 ms longer for the with-winding case. |
For a Y-connected regulating winding whose neutral is not brought out, test two phases at a time (for example A and B, treating C as the neutral); the resistance must be converted: R = 1/3 R′ for a two-phase measurement, or R = 1/2 R′ for a single-phase measurement. For a Δ-connected regulating winding, R = R′ for a two-phase measurement and R = 2/3 R′ for a single-phase measurement.
Technical Specifications| Output current | 1.0A, 0.5A, 0.2A |
| Transition resistance range | 0.3–20Ω (1.0A); 5–40Ω (0.5A); 20–100Ω (0.2A) |
| Transition time range | 0–320ms |
| Open-circuit voltage | 24V |
| Transition resistance accuracy | ±(5% of reading ±0.1Ω) |
| Transition time accuracy | ±(0.1% of reading ±0.2ms) |
| Sampling rate | 20kHz |
| Storage | Internal storage (500 groups) |
| Display | 7-inch high-brightness LCD |
| Interfaces | RS232, USB, built-in high-speed printer |
| Working power | AC220V ±10%, 50Hz ±1Hz |
| Ambient temperature | -10°C – 50°C |
| Ambient humidity | ≤85%RH |
The XHYZ1668 is aimed at the teams that keep on-load tap changers reliable across their service life:
Main unit, test leads, power cord, fuses, printer paper, ground wire and line bag. Please contact us for configuration details and on-site support.
Company Details
Business Type:
Manufacturer
Year Established:
2013
Total Annual:
1000000-5000000
Employee Number:
50~100
Ecer Certification：
Verified Supplier
Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. Has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical... Xi'an Xu&Hui Electromechanical Technology Co., Ltd. /Xian XZH Electric Power Technology Co., Ltd. Has found in 2013, located in Xi'an, China. which is a highly experienced team dedicated to developing electrical...
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