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Disconnecting method and disconnecting system of fuse

A fuse and switch disconnection technology, applied in the field of switch control, can solve the problems of insulator damage, plastic components, cable insulator fire, danger, etc.

Active Publication Date: 2021-12-14
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 disconnected, 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 instantaneous 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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  • Disconnecting method and disconnecting system of fuse
  • Disconnecting method and disconnecting system of fuse
  • Disconnecting method and disconnecting system of 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 application discloses a method for disconnecting a fuse, which includes the following steps: sending a derating command or a shutdown command to the working unit, and the working unit executes the derating command or the shutdown command to reduce the working current; obtaining the working value of the working current, The operating value is compared with the preset value, and when the operating value is less than the preset value, a switch disconnection command is generated; according to the switch disconnection command, the user is instructed to perform a disconnection operation. Before the fuse is disconnected, the working unit of the circuit where it is located is derated or shut down, thereby reducing the current passing through the fuse and avoiding the danger of arcing caused by excessive current when the fuse is disconnected. The present application also provides a fuse breaking system.

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 disconnected, 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 instantaneous sparks. The greater the current at the time of breaking, the greater the arc energy, and then Cause damage to the insulator ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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