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Distribution line fault processing method based on 5G communication modules

A fault handling method and power distribution line technology, which is applied to circuit devices, AC network circuits, electrical components, etc., can solve problems such as difficulty in coordinating fixed values ​​between switches, incoordination of time level differences, abnormal line fault handling, etc., to achieve It is convenient for equipment commissioning, installation and maintenance, reduces workload, and has the effect of fast fault isolation time

Pending Publication Date: 2021-06-22
西安兴汇电力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Centralized feeder automation has high flexibility and strong adaptability, but if the distribution lines adopt the centralized feeder automation mode, not only laying optical cables will consume a lot of resources, but the main power distribution station will also be under tremendous pressure
Recloser-type in-situ feeder automation requires the substation outlet switch to be overlapped multiple times to cooperate, resulting in multiple impacts on the primary grid and multiple short-term incoming calls at the user end, which is likely to cause damage to the primary grid and to users. Bring bad electricity experience
[0004] Distributed on-site feeder automation can quickly handle faults, but it has high requirements for network communication and requires the laying of optical cables, which is expensive and difficult to operate and maintain
[0005] Traditional on-site feeder automation needs to cooperate with the trip delay and reclosing time limit of the outlet switch of the substation, and can automatically complete the fault removal. However, in the multi-section switch line, it is difficult to coordinate the setting value between the switches, and the time difference coordination Can’t get up; traditional on-site feeder automation is based on the multiple tripping and reclosing of outlet switches and line section switches when dealing with faults. Generally, two reclosures are required to complete fault isolation and restore power supply in non-faulty areas; traditional feeder After the automation function is started, if the switch refuses to open or trips by mistake, the logic of the feeder automation function will stop and cannot be executed, resulting in abnormal line fault handling; The functions that require information can only be uploaded to the power distribution master station for analysis

Method used

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  • Distribution line fault processing method based on 5G communication modules
  • Distribution line fault processing method based on 5G communication modules
  • Distribution line fault processing method based on 5G communication modules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] How to deal with short circuit faults:

[0080]Its fault judgment principle: When a short circuit fault occurs on the line, the upstream current of the short circuit fault point will increase, and the current downstream of the fault point will not change much, so the terminal equipment located upstream of the fault point will detect a large fault current, and the current downstream of the fault point will What the terminal equipment detects is the load current when the line is running normally. If the protection action is activated after the terminal equipment detects a large fault current, the switch is opened, and the terminal equipment downstream of the fault point can detect that the line is in a voltage-loss state. When the voltage is high, the point of failure is between these two end devices.

[0081] Processing examples such as Figure 3 to Figure 8 Shown: If there is no delay in substation protection, the setting value cannot be set, and the protection range ...

Embodiment 2

[0083] The method of grounding fault treatment, the technical principle of fault judgment is as follows: overhead lines can be divided into high-current grounding system and small-current grounding system according to the way of substation neutral point grounding. The high-current grounding system refers to the neutral point direct grounding system and The neutral point is grounded through a small resistance system, and the small current grounding system refers to a neutral point ungrounded system and a neutral point grounded system through an arc suppression coil. The most used in distribution lines is the small current grounding system, but in recent years, with the increase and growth of urban cable lines, there are more and more cases of applying small resistance grounding methods.

[0084] In the distribution line, for the neutral point ungrounded system, when a single-phase ground fault occurs on the line, the zero-sequence voltage on the line changes suddenly, the direct...

Embodiment 3

[0089] Disconnection fault handling method, the principle of fault judgment technology is as follows: with the application of more and more insulated wires, the proportion of ground faults and short-circuit faults in distribution line faults is getting smaller and smaller, and the proportion of disconnection faults is But more and more. In distribution lines, single-phase disconnection can be divided into three types: the first type is that the breakpoint is not grounded; the second is that the breakpoint power supply side is grounded; the third is that the breakpoint load side is grounded. When a breakpoint is not grounded and a disconnection fault occurs, the three-phase voltage upstream of the breakpoint is still in a balanced state, and the three line voltages remain unchanged, but the current of the faulty phase of the fault circuit will decrease. The location of the disconnection fault is related. The closer the fault location is to the substation, the greater the reduct...

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Abstract

The invention discloses a power distribution line fault processing method based on 5G communication modules. A power distribution master station, terminal equipment, 5G network communication modules and a line tower are included, the power distribution master station, a regional terminal and a unit terminal are all provided with the 5G network communication modules, the power distribution master station is wirelessly connected with the regional terminal through the 5G network communication modules, and the regional terminal and the unit terminal are wirelessly connected through the 5G network communication module. The beneficial effects of the method are that the unit type terminal and the regional type terminal cooperate with each other through the 5G network communication module, so the accuracy of fault judgment can be improved, the time for fault isolation and non-fault area power supply recovery is shortened, and the workload of operation and maintenance personnel is reduced; the operation states of the line and the intelligent transformer area can be monitored in real time, so operation and maintenance personnel are reminded of problems and risk points existing in line operation, and the frequency of line faults is reduced; and the frequency of short-time power failure of lines is reduced, the service time of equipment is prolonged, and the power utilization experience of users is improved.

Description

technical field [0001] The invention relates to the technical field of fault handling of power distribution lines, in particular to a fault handling method for power distribution lines based on a 5G communication module. Background technique [0002] In the existing technology, 10kV distribution lines are widely distributed, the operating environment is complex, and faults occur frequently. For the problem of how to quickly locate and isolate the fault after a short-circuit fault occurs on the distribution line, and restore the power supply in the non-faulty area, the current solution is to use a centralized feeder Automatic and on-site feeder automation are solved, such as Chinese patents: 1. Distribution network fault handling method using area blocking (public number: CN105552858B;); 2. Adaptive on-site feeder automatic fault handling based on area serial number Method (publication number: CN109245072B); 3. The technical solutions of a deep learning-based distribution net...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J13/00
CPCH02J3/00125H02J3/0012H02J13/00022Y04S40/126Y02E60/00
Inventor 郭琳云甘兴林潘琦张建涛班诗淇
Owner 西安兴汇电力科技有限公司
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