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Direct operating current system is a set of electrical devices and appliances, including power sources required for the functioning of the main technological complexes of enterprises. The features of direct current systems are a significant spatial distribution, susceptibility to strong electromagnetic interference and noise. A frequent fault in DC operating current systems isolated from the ground is the damage of the insulation of one pole to ground. This fault is not accompanied by large currents, but can cause false operation of the electrical system. In this paper we consider the method of searching for the faulty section, and analyze the occurrence of interference in the search system. The improved search system based on the external reference voltage superimposition method has confirmed its performance in real objects.

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