Method for overhauling ring main unit of 10kV cable circuit without switching power supply off

Abstract

The invention discloses a method for overhauling a ring main unit of a 10kV cable circuit without switching a power supply off. When a ring main unit between two ring main units needed to be repaired, a bypass system is built by using an original cable, and a power supply side circuit and a power transmission side circuit are communicated in sequence by using the built bypass system, thereby ensuring normal power supply and power transmission after the overhauled ring main unit exits from running and fulfilling the aim of overhauling without switching the power supply off. The bypass system is built by using the original cable, thereby reducing the pavement length of the bypass cable, reducing the investment of labor force and materials, and lowering the overhauling cost; non-power-off operation can be realized under the standby and non-standby interval situations of the ring main units on both sides of a bypass cable; under the non-standby interval situation of the ring main unit, the power-off overhauling times can be reduced effectively, and the power supply reliability is enhanced; the operation level is raised, the power supply reliability is improved, the loss of electric quality due to long-time power failure is reduced, and a remarkable economic benefit is achieved.

Description

Technical field [0001] The invention relates to a method for overhauling a ring network cabinet without power failure for a 10kV cable line. Background technique [0002] When a ring network cabinet in the ring network system fails or has serious defects, the cable bypass system is often used to connect the two incoming ring network cabinets without power failure or short-term power failure, and temporarily replace the fault ring network cabinet to supply power to the branch boxes and users. . Bypass operation The key step for overhauling the ring network cabinet (branch box) between the two ring network cabinets is to use the bypass cable operating equipment to perform the operation. For the case of no backup interval, short-term power outages are used. The principle of this mode of operation is shown as figure 2 Shown. [0003] The method of repairing the ring main unit during short-term power failure includes the following steps: [0004] Step 1. Confirm that the load current i...

AI Technical Summary

Problems solved by technology

[0015] (1) To establish a bypass system and connect the ring network cabinets on both sides, it is necessary to lay a long cable line. When laying the bypass cable, it needs to invest more manpower and material resources, which increases the maintenance cost and the protection and management workload of the cable line. Corresponding increase

[0016] (2) Due to the long cables used in the bypass system, when passing through highways or densely populated areas, more manpower is required for management

A little carelessness will cause serious accidents, and the safety level of maintenance operations is not high

[0017] (3) Lines without spare interval switches need to be powered off for maintenance, which reduces the reliability of power supply and causes unnecessary impact on users;

[0018] (4) The power outage brings about the loss of electricity, which reduces the user's satisfaction with the enterprise

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