Anti-thunder device for residual-current protection device

Abstract

The invention relates to an anti-thunder device for a residual-current protection device. The anti-thunder device comprises a module base and three module boxes inserted on the base. An indicating window and a color changing block are arranged on the top surface of each module box. Voltage dependent resistors, color changing sheets, small tension springs, tripping pieces, phase line plug pins and null line plug pins are mounted in the module boxes. Micro switches are mounted in the middles of the inner bottom layers of the module bases. Remote signaling connectors are arranged on the lower left sides of the rear outer sides of the module bases. The anti-thunder device for the residual-current protection device has the advantages that non-linear anti-thunder elements are combined into three pluggable anti-thunder modules, the anti-thunder modules can be connected to the residual-current protection device in parallel after being assembled to the integrated module base, and accordingly, the anti-thunder and anti-surge effect is achieved; anti-thunder failure state indication and the remote signaling connectors are provided, the temperature rise of the anti-thunder device can be warned early according to color change of temperature-sensing color blocks on the front sides of the module boxes, failure of the anti-thunder modules can be discovered timely, and accordingly, safety use of the anti-thunder device for the residual-current protection device is guaranteed.

Description

technical field [0001] The invention relates to the field of residual current protection, in particular to a lightning protector for a residual current protection device. Background technique [0002] The residual current refers to the current in which the vector sum of the currents of each phase in the low-voltage distribution line is not zero. That is, when an accident occurs on the power consumption side, the current flows from the electrified body through the human body or the equipment casing to the earth, causing the current in the incoming and outgoing lines of the main circuit to be unequal. At this time, the instantaneous vector composite effective value of the current is called residual current. Even a small leakage current can cause great harm, causing serious consequences such as electric shock to the human body and equipment damage. The way to deal with the residual current is to install a residual current action protector in the low-voltage power grid. When th...

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Problems solved by technology

However, the residual current protector itself will also be disturbed by line surges and external induced lightning, resulting in failure of the protection function or even damage to the device. Therefore, the residual current protection device should also be equipped with a lightning protector. In the company's industry standard "Q / GDW 11289-2014", there are already clear specifications

At present, the lightning protection products of residual current protectors on the market all have the function of lightning protection, but their basic functions are relatively single. Some have failure indications but do not have remote alarms, and some do not have the function of indicating internal temperature rise, so lightning protection cannot be detected in time. Heating failure of components, most products are not perfect in terms of safety protection function

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