Unlock instant, AI-driven research and patent intelligence for your innovation.

A directional current protection method and device

A current protection and directional technology, which is applied to emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of low cost and achieve low cost, high reliability and wide application range Effect

Active Publication Date: 2017-08-11
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing directional current protection technology, and provide a directional current protection method and device, which can still achieve reliable directional protection when a near-field fault occurs, and does not require additional Hardware, low cost to implement

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A directional current protection method and device
  • A directional current protection method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0027] Aiming at the problem that it is difficult for the existing directional protection equipment to effectively determine the fault direction when a fault occurs in the near area, thereby affecting the directional protection, the idea of ​​the present invention is based on the effective value of the phase voltage of the current cycle and the effective value of the phase voltage of the previous cycle. Judging whether the current fault is a near-area fault based on the changes in time, if it is judged that it is not a near-area fault, then according to the existing method to judge the fault direction according to the current and voltage of the current cycle and take corresponding protection actions, if it is judged that it is a near-area fault If there is a fault, the voltage of the current cycle is not used, but the fault direction is judged according ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a directional current protection method and belongs to the technical field of smart grids. The present invention judges whether the current fault is a near-zone fault according to the effective value of the phase voltage of the current cycle and the change between the effective value of the phase voltage of the previous cycle. If it is judged to be a near-zone fault, the voltage of the current cycle will not be used, but the fault direction will be judged according to the voltage of the previous cycle and the current of the current cycle and corresponding protection actions will be taken. protective action. The invention also discloses a directional current protection device. Compared with the prior art, the present invention can still realize reliable directional protection when a fault occurs in the near field, and does not need additional hardware, and the realization cost is low.

Description

technical field [0001] The invention relates to a directional current protection method and device, belonging to the technical field of smart grids. Background technique [0002] In recent years, with the development of smart grids, low-voltage circuit breakers have been increasingly used in new energy and distributed power applications. Distributed power units can both feed current to the grid and consume electricity from the grid. This means that in this case, the direction of the fault can change with time, and when a current fault occurs, determining the direction of the fault current becomes a prerequisite for the corresponding protection of the circuit breaker. The traditional method of judging the fault direction is through the power direction relay, which is also the method used most of the time. The power directional relay usually includes a directional element and an action element: the directional element judges the fault direction by using phase comparison or a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/00H02H3/093
Inventor 殷建强奚慎云任灵
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)