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Method and system for disconnecting fuse

A technology for fuses and disconnecting signals, which is applied in the field of switch control and can solve problems such as danger, damage to insulators, plastic components, and cable insulators on fire

Active Publication Date: 2020-09-22
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the fuse-type isolating switch is broken, the moment the fuse contact is disconnected from the socket, the voltage acts on the medium (air) to cause the air to ionize and generate instant sparks. The greater the current at the time of breaking, the greater the arc energy, and then Cause damage to the insulator near the arc, and in severe cases, it may also cause the adjacent plastic components, cables and other insulators to catch fire
At the same time, the arc generated by disconnection also has certain dangers for users who operate the fuse type isolating switch.

Method used

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  • Method and system for disconnecting fuse
  • Method and system for disconnecting fuse
  • Method and system for disconnecting fuse

Examples

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Embodiment Construction

[0036] The specific implementation manners of the present application will be clearly described below in conjunction with the accompanying drawings.

[0037] Please refer to figure 1 , in the design of the box-type substation 200a, a protection device will be configured on the low-voltage side of the transformer 150a, and the protection device is connected to the inverter 20a in the external power grid of the box-type substation 200a. Generally, the protection device is the fuse 10a. When the inverter When the operating current in the transformer 20a is abnormal, the fuse 10a acts as a short-circuit protection function of fusing the fuse core, and the fuse 10a also serves as a circuit switch to realize the control function of circuit opening and closing.

[0038] What this application is to solve is the arc problem caused when the fuse 10a is used as a circuit switch. Usually, in the process of using the fuse 10a to control the opening and closing of the circuit, because the f...

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PUM

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Abstract

The invention discloses a method for disconnecting a fuse, and the method comprises the following steps: sending a derating instruction or a shutdown instruction to a working unit, and executing the derating instruction or the shutdown instruction by the working unit to reduce working current; obtaining a working value of the working current, comparing the working value with a preset value, and generating a switch breakable instruction when the working value is less than the preset value; and indicating a user to perform disconnection operation according to the switch disconnectable instruction. Before the fuse is disconnected, derating or shutdown operation is carried out on the working unit of the circuit where the fuse is located, so the magnitude of current passing through the fuse isreduced, and the electric arc danger caused by overlarge current when the fuse is disconnected is avoided. The invention further provides a disconnection system of the fuse.

Description

technical field [0001] The application relates to the field of switch control, in particular to a disconnecting method and a disconnecting system of a fuse. Background technique [0002] Box-type substation, also known as prefabricated substation or prefabricated substation. It is a factory prefabricated indoor and outdoor compact power distribution equipment that integrates high-voltage switchgear, distribution transformers and low-voltage power distribution devices according to a certain wiring scheme. In a box-type substation, a fuse-type isolating switch is usually introduced into different internal circuits to protect the inverter from failure. When the fuse-type isolating switch is broken, the moment the fuse contact is disconnected from the socket, the voltage acts on the medium (air) to cause the air to ionize and generate instant sparks. The greater the current at the time of breaking, the greater the arc energy, and then Cause damage to the insulator near the arc...

Claims

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Application Information

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IPC IPC(8): H02H3/02H02H3/08H02H7/122G01R31/327
CPCH02H3/025H02H3/021H02H3/08H02H7/122G01R31/3275
Inventor 黄继常周鹏
Owner HUAWEI DIGITAL POWER TECH CO LTD
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