Product introduction
The 3 Phase DC Wingding Resistance Tester is an intelligent device designed specifically for measuring the DC resistance of three-phase windings in large capacity transformers. For on load tap changers, there is no need for discharge, and the tap changer can be directly adjusted. The measurement time is one-third of traditional single-phase measurement, which can greatly shorten the working time and labor intensity. The test data is stable, fast, and has good repeatability, making it the best choice for on-site measurement of transformer DC resistance.
Technical parameter
| Testing current | Single phase：1A 5A 10A 20A | |
| Three phase：1A 5A 10A | ||
| Measurement scope | Single phase | |
| 1A 10mΩ ～ 20Ω | ||
| 5A 1mΩ ～ 4Ω | ||
| 10A 1mΩ ～ 2Ω | ||
| 20A 1mΩ ～ 1Ω | ||
| Three phase | ||
| 1A 10mΩ ～ 6Ω (each phase) | ||
| 5A 1mΩ ～ 1Ω (each phase) | ||
| 10A 1mΩ ～ 0.6Ω (each phase) | ||
| Measurement accuracy | ± (0.2%Full span ± 2 words ) | |
| Maximum resolution | 0.1μΩ | |
| Data storage capacity | 150 groups | |
| Power supply | AC 220V±22V,50Hz±2Hz | |
| Working environment | Ambient temperature: 0°～40° Relative humidity :≤80% | |
purpose
1. Check the welding quality of the winding: defects such as virtual welding, false welding, and desoldering were found.
2. Check the contact condition of the tap changer: Check whether the contact at each tap position is good and whether the resistance value is stable.
3. Check if there is a short circuit between the turns of the winding: Although this method is not easy to detect minor short circuits, severe short circuits can cause abnormal resistance.
4. Check the connection between the lead, sleeve, and lead: ensure reliable connection.
5. Calculate winding temperature rise: based on cold and hot resistance calculations.
6. Judging the balance of three-phase resistance: Calculating the imbalance rate of phase to phase or line to line resistance is a key indicator for determining whether the winding is normal (usually requiring ≤ 2%, with stricter requirements for phase resistance).
7. Discovering manufacturing defects or transportation damage, such as wire breakage, insufficient wire cross-section, etc.
Precautions for use
① When measuring a no-load tap changer, the discharge must be exited before switching the tap changer, and the tap changer can only be switched after the discharge indication is complete.
② It is not allowed to dismantle the wiring during the measurement process.
③ If the charging progress bar and current display value remain stagnant for a long time, the measured winding resistance may exceed the current measurement range, and the current may not reach the preset value. At this point, you can press the 'Exit' button to return, select the current again, and try again.
④ When replacing the fuse and accessories, parts of the same model of instrument should be used.
summarize
The 3 Phase DC Wingding Resistance Tester is an efficient tool in the field of modern transformer testing. It revolutionizes the efficiency of testing by simultaneously conducting DC resistance tests on three-phase windings, significantly improving the accuracy and comparability of data (especially three-phase unbalance rate), and effectively solving the problem of residual magnetism, greatly enhancing the safety of testing. For power companies, maintenance companies, testing and research institutions, and transformer manufacturing plants that require extensive transformer testing, it is an ideal choice to improve work efficiency, ensure equipment safety, and ensure data accuracy. When selecting, attention should be paid to its current output capability, measurement accuracy, demagnetization effect, ease of operation, and whether it meets the specific needs of the tested transformer.
Hot Tags: 3 phase dc wingding resistance tester, China 3 phase dc wingding resistance tester manufacturers, suppliers, factory
