A thermocouple is created when two dissimilar materials touch and the contact point produces a small open-circuit voltage as a function of temperature.
热电偶时创建两个不同材料接触和联络点，产生一个小开路电压随温度的变化。
2
The faults include opencircuit, short circuit and poor contact. It also can be used to telemetry the position of the fault, including the leak grounding, wire breaking and poor contacting.
同时也可以对电力电缆的高阻闪络、高低阻性的泄漏性接地和电力电缆的断线、接触不良等故障位置进行遥测。
3
Through the contact test of underground reference electrode, we have tested the natural potential, casing protecting potential, the anode working potential, and the anode opencircuit potential.