¿Cómo se comprueba la resistencia del devanado de un transformador?
25 de marzo de 2022
Ⅰ: How do you test the winding resistance of a transformer?
Transformer winding resistance measurements are obtained by passing a known DC current through the winding under test and measuring the voltage drop across each terminal (Ohm’s Law).
Winding resistance in transformers will change due to shorted turns, loose connections, or deteriorating contacts in tap changers. Regardless of the configuration, the resistance measurements are normally made phase-to-phase and the readings are compared with each other to determine if they are acceptable.
Ⅱ: Which method is used to measure resistance of winding?
The windings resistance can be directly measured with an ohmmeter. Another method is to calculate the resistance by measuring the current trough every winding, using an ammeter A, when a voltage is applied and measured with a voltmeter V.
Ⅳ: Parameters of the DCR tester/winding resistance tester：
| Artículo | Parámetro | inaccuracy |
| Corriente de prueba | AUTO、<20mA、40mA、 | |
| 200mA、1A、5A、10A | ||
| Gama | 0.5mΩ~0.8Ω (10A) | ±(0,2%+2dígito) |
| 1mΩ-4Ω (5 A) | ||
| 5mΩ-20Ω ( 1 A) | ||
| 100mΩ-100Ω (200mA) | ||
| 1Ω-500Ω (40mA) | ||
| 100Ω-100KΩ (<20mA) | ±(0,5%+2dígito) | |
| Mejor resolución | 0,1μΩ | |
| Mostrar | Pantalla táctil LCD en color de 7 pulgadas | 4 dígitos efectivos Indicación de resistencia |
| Almacenamiento de datos | 1000 juegos | |
| Temperatura de funcionamiento | 0℃~40℃ | |
| Humedad relativa | <90%RH,non-condensing | |
| Alimentación | AC 220V±10V,50Hz±1 Hz | Fuse 2A |
| Potencia máxima | 200W | |
| Dimensión | 360*290*170(mm) | |
| Peso | Instrument box:6 KG | wire box:5 KG |
Here are some pictures when using:
