We have developed a dual clamp multifunctional grounding resistance tester for Wuhan UHV:

Technical field: This utility model relates to an electronic testing instrument, particularly a grounding resistance tester.  

Background technology: Good grounding of power transmission equipment, electromechanical equipment, and ground buildings is an important guarantee for the normal operation and safety of equipment. In addition to inspecting newly installed grounding devices to ensure compliance with design requirements, regular inspections of grounding devices are the only basis for ensuring reliable equipment grounding. At present, the commonly known hand cranked grounding resistance tester is used to test grounding resistance, and its basic principle is the three-point voltage drop method. Afterwards, the digital grounding resistance tester was partially replaced due to its stability, reliability, high measurement accuracy, and better operability. However, both manual and digital grounding resistance testers have the following shortcomings: 1. During on-site testing, potential and current auxiliary piles must be driven, which makes it impossible to carry out detection work in high-rise cities and other areas with strong foundations; 2. It is necessary to cut off the grounding circuit, which will affect the normal and safe operation of the equipment during operation; 3. It requires certain reading calculations to obtain measurement results, which is inconvenient to use.  

Invention content: In order to solve the technical problem of cumbersome operation of existing grounding resistance testers, this utility model provides a dual clamp multifunctional grounding resistance tester that can be used for both ground pile method and online detection without auxiliary piles. The technical solution of the present utility model is to provide a host, which is equipped with a display device and multiple operation buttons. The feature is that the host comprises two aviation plugs for receiving and transmitting, and the two aviation plugs for receiving and transmitting are respectively connected to external voltage clamps and current clamps. The dual clamp multifunctional grounding resistance tester of this utility model is a grounding resistance tester that can be used for dual measurement methods of ground pile method and dual clamp method. It not only has the traditional function of measuring grounding resistance with auxiliary electrodes, but also has the unique function of measuring without auxiliary electrodes. When using the non-contact measurement technology of dual clamp method to detect grounding resistance, there is no need to drive auxiliary piles or interrupt grounding. As long as the dual clamp clamp is wrapped around the grounding lead, the grounding resistance value can be measured. Therefore, it has the advantages of convenient operation, rapid measurement, high accuracy and strong anti-interference ability. At the same time, this utility model grounding resistance tester also has the advantages of small size, light weight and easy portability.