Low-voltage switch drawer cable clamp spring replacement device and method

Abstract

The invention belongs to the technical field of nuclear power station electrical maintenance and particularly relates to a low-voltage switch drawer cable clamp spring replacement device and method. The device comprises clamp bodies, handles and a spring, wherein the two clamp bodies are fixedly connected with the two handles respectively, and the spring is connected between the two handles. According to the low-voltage switch drawer cable clamp spring replacement device and method, the increase of the workload caused by the modification of a primary loop plug-in of a cable by a worker on thescene is avoided, the cost is saved, the material waste is reduced, the working efficiency is improved, the clamping force of the primary loop plug-in of a drawer after replacement is greatly improved, and the inspection standard is met; and the spring is arranged close to the handles, so that a certain resilience force is ensured, the use by the worker is facilitated, and the device is convenientto carry to a field for use.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant electrical maintenance, and in particular relates to a device and method for replacing a cable clip spring of a low-voltage switch drawer. Background technique [0002] Most of the bus bars of a nuclear power plant unit use low-voltage switchgear drawers with a height of 8E (1E=25mm) or more. During the process of testing the clamping force of the primary circuit connectors of the drawers, the following problems were found: (1) For the primary circuit plugging of 8E and above drawers Most of the connectors of the connectors are MNS2.0, and the qualified standard is 73N. However, it is found that some cable primary circuit connectors do not meet the inspection standards due to long-term online use; (2) if the primary circuit of the switch drawer When the cable with insufficient clamping force of the connector is replaced, the staff needs to modify the new cable to make it the same lengt...

AI Technical Summary

Problems solved by technology

[0002] Most of the bus bars of a nuclear power plant unit use low-voltage switchgear drawers with a height of 8E (1E=25mm) or more. During the process of testing the clamping force of the primary circuit connectors of the drawers, the following problems were found: (1) For the primary circuit plugging of 8E and above drawers Most of the connectors of the connectors are MNS2.0, and the qualified standard is 73N. However, it is found that some cable primary circuit connectors do not meet the inspection standards due to long-term online use; (2) if the primary circuit of the switch drawer When the cable with insufficient clamping force of the connector is replaced, the staff needs to modify the new cable to make it consistent with the length of the on-site cable, and the joint needs to be re-pressed. The process is complicated, time-consuming and labor-intensive.

Moreover, the internal space of the drawer is small, and the operation is inconvenient for replacement; (3) If the clamping spring is replaced for the cable with insufficient clamping force of the primary circuit connector of the switch drawer, because there is no special tool, usually only needle-nose pliers can be used to replace it. The new snap ring cannot be installed in place at one time, and the clamping force of the primary circuit connector after replacement cannot be guaranteed

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