The small current grounding line selection device is used to alarm and find the fault line device in case of the fault of the small current system. It is mainly used in the power system power supply system of substation, power plant, hydropower station and large-scale factories and mines such as petroleum, chemical industry, metallurgy, coal, railway, construction and other large-scale enterprises.

The small current grounding line selection device comprehensively uses the wavelet analysis method of transient process and harmonic analysis and energy method of steady-state process, further improves the accuracy of line selection, and designs, manufactures and detects the line selection in strict accordance with the requirements of relay protection device. The small current grounding line selection has LCD screen, which can display the good and clear grounding line and name, and it is convenient to use. However, the small current grounding line selection device is ordered and produced according to the site requirements. In this case, there are several points to be noticed. If there is a slight carelessness, it may lead to misleading, which leads to the ordering of the small current grounding line selection device and the site small current system, which can not be used.

Customers need to pay attention to these points when ordering products:

1. when ordering the small current grounding line selection device, please inform the manufacturer of the small current grounding line selection device of the type of power supply: AC, DC and voltage;

2. please inform whether communication function is needed and which communication interface and protocol to choose;

3. the number of bus sections, total outgoing lines, the number of each line and the CT ratio shall be informed to the manufacturer for programming. If it is a new station, some parameters cannot be determined, it can be programmed on site during the commissioning;

4. please inform the manufacturer whether the optional line coding alarm function is needed;

5. please pay attention to the size of the opening screen of the selected small current grounding line selection device model.