Ground resistance monitor with self-inspection and self-correction functions

Abstract

The invention discloses a ground resistance monitor with self-inspection and self-correction functions. The ground resistance monitor comprises a main circuit and a switching circuit connected with the main circuit, wherein the switching circuit is further connected with an external ground network and a standard resistor respectively. A high-precision standard resistor analog ground network is added into a circuit board, a circuit which originally tests the external ground network is switched to the standard resistor on a test board through a relay switching circuit, and if a deviation existsbetween a measured value and a preset standard resistance value, fine adjustment can be realized in a program and an offset is added to the measured value so as to reach a normal value; if a relatively large deviation exists between the measured value and the standard value, equipment has a relatively large problem and is required to be returned to a factory for repair. The switching circuit adopts the structure as follows: four double-pole double-throw relay switches are used. After adoption of the ground resistance monitor, a technician can remotely know the working state of the equipment and can perform remote correction when measurement data has a deviation.

Description

technical field [0001] The invention relates to the field of grounding resistance monitoring, in particular to a grounding resistance monitoring instrument with self-checking and correction. Background technique [0002] Grounding resistance is the resistance encountered when the current flows from the grounding device into the ground and then flows to another grounding body or spreads far away through the ground. The grounding resistance value reflects the good degree of contact between the electrical device and the "ground" and reflects the scale of the grounding grid. The function of grounding is mainly to prevent people from being hit, equipment and lines from being damaged, preventing fire and lightning strikes. When a current flows into the soil from the grounding body, there will be resistance in the soil, which is the grounding resistance. Grounding resistance is the main technical parameter of the grounding system and an important indicator to measure the engineer...

AI Technical Summary

Problems solved by technology

During the long-term working process of the equipment, there may be problems such as device aging and inaccurate parameters. There are basically no grounding resistance monitors with self-test function on the market, and it is completely impossible to know the quality of the equipment and the accuracy of the data remotely.

However, it is impossible for technicians to be there in real time. They can only realize the self-inspection and calibration of the equipment by issuing commands to the equipment. However, there is no related technology on the market for this technology, and it is basically on-site maintenance.

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