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

A safety protection method and device for live working in distribution network

A safety protection device and live working technology, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of personal safety injury, elevation, etc., to ensure personal safety, ensure personal safety, Extend the effect of arc extinguishing ability

Active Publication Date: 2020-12-22
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is often encountered in the actual field that due to the operation overvoltage and other reasons, the distribution network generates overcurrent and flows through the grounding wire, causing the grounding wire to fuse. At this time, the working phase voltage will no longer be zero, but rise to the distribution network. Phase voltage, under the action of high voltage, constitutes a hazard to the personal safety of live workers who are working

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 safety protection method and device for live working in distribution network
  • A safety protection method and device for live working in distribution network
  • A safety protection method and device for live working in distribution network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]This embodiment provides a safety protection method for live work on a distribution network, which includes the following steps:

[0053]1) Install a current sensing unit on the ground wire and connect it to a voltage and current detection device to detect the current value i(t) flowing on the ground wire, t is the detection time; and connect an insulation from the top of the ground wire Lead wire to the voltage and current detection device to measure the voltage U(t) from the top of the grounding wire to the ground; at the same time install three single-phase circuit breakers with arc extinguishing capability at the outlet of the distribution network substation.

[0054]2) The current i(t) measured from the ground wire and the theoretical current i flowing through the ground wireN(t) (Theoretical current iN(t) is the current value flowing through the ground wire normally, which can be considered as the current flowing through the fault point after a single-phase metallic ground fau...

Embodiment 2

[0057]This embodiment provides a safety protection device for live working on a distribution network, and its structure and primary wiring diagram are as follows:figure 1 Shown.

[0058]Taking phase C as the working phase as an example, install a current sensing unit on the ground wire and connect it to a voltage and current detection device to detect the current value i(t) flowing on the ground wire, and t is the detection time; Connect an insulated wire to the top of the ground wire to the voltage and current detection device to measure the voltage U(t) from the top of the ground wire to the ground. After satisfying the judgment formulas in steps 2) and 3) of Example 1 in turn, it is considered that there is a fault or hidden danger in the system. At this time, the control device in the safety protection device controls the phase switch between the non-operating phases (between phase A and phase B). The two single-phase circuit breakers between) are closed to artificially form a shor...

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 safety protection method and device for live working of a power distribution network. The method comprises the following steps: the step 1, detecting a current value i(t) flowing through a ground wire and a voltage value U(t) to ground at the top end of the ground wire; and the step 2, carrying out the following judgment and operation based on the detected data: before the ground wire is fused, enabling a three-phase circuit breaker installed at the head end of the power distribution network line to trip naturally by controlling an inter-phase switch of a non-operation phase to be closed. According to the invention, the safety of live working can be improved, and the situation that after the ground wire is fused due to overcurrent, the work phase voltage is no longer zero, and harm is brought to operators is avoided.

Description

Technical field[0001]The invention relates to a safety protection method and device for live working of a distribution network.Background technique[0002]The distribution network is a power infrastructure that directly faces users. The feeder of the distribution network goes deep into the power users, and the operating environment is complex and changeable. Due to the low insulation level of the distribution network, faults are prone to occur under the action of line pollution or other external factors, and due to the outdated and aging power supply facilities in some areas, the equipment integrity rate is low, which increases the hidden danger of accidents. The workload is large. In addition, due to the rapid development of the social economy, various distribution network access projects have also increased sharply, the grid structure has continued to expand, and the society’s requirements for power companies have become higher and higher, and the traditional blackout construction m...

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): H02H7/26H02H3/16
CPCH02H3/165H02H7/26
Inventor 喻锟陈小平曾祥君王沾卓超
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY