Grounding device resistance monitor for preventing electric shock to humans and animals

Abstract

The invention discloses a grounding device resistor monitor for preventing humans and animals from electric shock.The grounding device resistor monitor comprises an indicator lamp, a control transformer and an indicator lamp box.The low-voltage side of the control transformer is connected to a grounding insulating wire of a distribution transformer in series.The indicator lamp is connected to the low-voltage side of the control transformer in parallel.By means of the grounding device resistor monitor, the device monitor means is improved, the heavy testing work of a grounding device can be effectively relieved, test omission, no tests, false tests and device shell electrification are avoided, it is avoided that the device runs with failures, and humans and animals are prevented from dieing of electric shock.

Description

technical field [0001] The invention relates to the field of distribution network detection, in particular to a grounding device resistance monitor for preventing electric shocks to humans and animals. Background technique [0002] In the power system, in order to keep the neutral point of the three-phase coil of the power distribution transformer from being displaced and to maintain the three-phase voltage balance, the neutral point of the three-phase coil of the transformer is usually connected to the ground through wires, flat iron and angle iron, and the transformer is connected in parallel. Shell, metal frame, this practice is called the working grounding and safety grounding of the transformer. Each connection point is usually connected and fixed with screws, which is often not standardized during installation. If the screws are loose or corroded for a period of time, the grounding resistance will increase or the grounding function will be lost, resulting in the three-...

AI Technical Summary

Problems solved by technology

The connection points are usually connected and fixed by screws, and the installation is often not standardized enough. After a period of operation, the screws are loose or a little bit of corrosion occurs and the contact is poor, which will increase the grounding resistance or lose the grounding effect, causing the three-phase coil of the power distribution transformer to be damaged. The neutral point shifts, and the casing and frame of the power distribution transformer are electrified, directly threatening the lives of humans and animals

[0003] Therefore, in actual operation, it is necessary to send staff to carry out heavy testing work on the grounding device on a regular or irregular basis, which is prone to missed, untested or false tests, which brings potential safety hazards to equipment and people.

For example, taking Wensu Power Supply Company as an example, it has jurisdiction over 3 110kV substations with a total capacity of 221.5 MVA, 11 35kV substations, 18 35kV lines, a total length of 337.05km, and a total of 56 10KV lines. The length is 1680.49km. There are 942 public transformers and 1947 special transformers in the power distribution transformer. After years of operation, the nodes of the grounding device have been corroded to varying degrees. Regular and occasional testing is not enough

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