Hierarchical protection setting calculation method for a power distribution network

A hierarchical protection and setting calculation technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as expansion of fault range, poor protection action selectivity, and unreasonable coordination of relay protection setting and setting, so as to achieve easy management and solution The effect of poor selectivity

Pending Publication Date: 2021-06-11
MAANSHAN POWER SUPPLY COMPANY STATE GRID ANHUI ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology helps improve the selection of protective actions for power systems by separating them between different stages based on their functions or settings. Each stage has its own specific timeslots that can be adjusted accordingly. When one zone fails it will trigger another zone's protection mechanisms automatically. By doing this coordination across multiple zones, better overall performance may ensured during fault conditions.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the selection between protectors based on their ability to quickly respond to changes caused by external events such as voltage fluctuations without causing damage. Additionally, traditional methods cannot handle multiple types of failures simultaneously due to limited space availability.

Method used

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  • Hierarchical protection setting calculation method for a power distribution network
  • Hierarchical protection setting calculation method for a power distribution network
  • Hierarchical protection setting calculation method for a power distribution network

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Embodiment 1

[0036] Such as figure 1 As shown, a distribution network hierarchical protection setting calculation method, the method includes:

[0037] (1) According to the function of the distribution network, the distribution network is divided into network source layer, backbone layer, branch layer and access layer from the main transformer end to the load end. The network source layer, backbone layer, branch layer and access layer correspond to Substation outlet switch, section switch, branch switch and boundary switch;

[0038] (2) The substation outlet switch protection is equipped with three-stage over-current protection, and the sub-section switch, branch switch, and boundary switch protection are respectively equipped with two-stage over-current protection;

[0039] (3) Substation outlet switch protection section I has a delay of 0s, and section II has a delay of 0.3s. Section switch, branch switch, and boundary switch protection section I and substation outlet switch protection sec

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PUM

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Abstract

The invention discloses a hierarchical protection setting calculation method for a power distribution network, and the method comprises the steps: dividing the power distribution network into a network source layer, a trunk layer, a branch layer and an access layer from a main transformer end to a load end according to the functions of the power distribution network, wherein the network source layer, the trunk layer, the branch layer and the access layer are respectively corresponding to an outgoing line switch, a section switch, a branch switch and a boundary switch of a transformer substation; configuring three-section type overcurrent protection for the transformer substation outgoing line switch protection, and configuring two-section type overcurrent protection for the section switch protection, the branch switch protection and the boundary switch protection; delaying the transformer substation outgoing line switch protection section II by 0.3 s, and enabling the section switch, the branch switch, the boundary switch protection section I and the transformer substation outgoing line switch protection section II to cooperate by adopting 100ms differential in sequence; when co-tripping occurs in protection on the same layer, reclosing and post-acceleration are adopted to remedy selectivity. According to the method, a hierarchical protection setting scheme is adopted, and the problems that power distribution network protection is difficult to set and the protection action selectivity is poor are solved.

Description

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Claims

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Application Information

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Owner MAANSHAN POWER SUPPLY COMPANY STATE GRID ANHUI ELECTRIC POWER
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