Connect the metal wire of the tracer line to the transmitter input end of the pipe locator, and the transmitter ground end should be as far away from the transmitter as possible. Use the grounding pile or the grounding of the electric pole to reduce the grounding resistance. Use the receiver to detect and receive the transmitted signal. The displacement and buried depth of the pipeline can be found.

示蹤線的測試原理：

Test principle of tracer line:

銅包鋼是由鋼芯線和緊密包覆其外的銅層構(gòu)成金屬芯，外側(cè)為PE防腐層，銅起到傳導(dǎo)弱電信號(hào)的作用，鋼絲則起到支撐作用。銅芯電線一般由內(nèi)層的銅芯線、中間層的絕緣包皮和外層的保護(hù)外皮組成。

Copper clad steel is a metal core composed of steel core wire and copper layer tightly wrapped around it. The outer side is PE anti-corrosion layer. Copper plays a role in transmitting weak current signals, while steel wire plays a supporting role. The copper core wire is generally composed of the inner copper core wire, the insulating sheath of the middle layer and the protective sheath of the outer layer.

銅包鋁由鋁芯線和緊密包覆其外的銅層構(gòu)成金屬芯，外層為PE防腐層。由于鋼質(zhì)燃?xì)夤艿劳鈱拥姆栏瘜訛榫哂薪^緣、防腐性能的塑料層或涂層，與銅包鋼、銅芯電線、銅包鋁等外層也為具有絕緣、防腐性能的塑料層結(jié)構(gòu)相似。

Copper clad aluminum consists of an aluminum core wire and a copper layer tightly wrapped around it to form a metal core, and the outer layer is a PE anticorrosive layer. As the anti-corrosion coating on the outer layer of steel gas pipeline is a plastic layer or coating with insulation and anti-corrosion performance, its structure is similar to that of copper-clad steel, copper core wire, copper-clad aluminum and other outer layers with insulation and anti-corrosion performance.

因此，我們將兩者等效，通過采用PCM管道電流衰減率法，對(duì)示蹤線防腐層平均絕緣質(zhì)量進(jìn)行檢測。檢測原理是向管道示蹤線施加某一頻率的電流信號(hào)，電流由示蹤線向遠(yuǎn)方傳遞時(shí)會(huì)逐漸衰減。其衰減大小與示蹤線的塑料層的絕緣電阻率有關(guān)，示蹤線塑料層的平均絕緣電阻率越高，電流衰減就越慢，反之則衰減越快。

Therefore, we equivalent the two methods and detect the average insulation quality of the anti-corrosion coating of the tracer line by using the PCM pipeline current decay rate method. The detection principle is to apply a certain frequency current signal to the pipeline tracing line, and the current will gradually decay when it is transmitted from the tracing line to the distance. The attenuation is related to the insulation resistivity of the plastic layer of the tracer line. The higher the average insulation resistivity of the plastic layer of the tracer line is, the slower the current attenuation is, and vice versa.

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