A Grounding Protection Method for Improving Transverse Selectivity of 6~10kv Power Grid in Coal Mine

A grounding protection and selective technology, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc., can solve the problems of inability to realize the underlying data sharing of the whole station, increase the calculation time of grounding protection software, and low lateral selectivity of grounding protection , to achieve the effects of improving reliability and safety, ensuring lateral selectivity, and improving lateral selectivity

CN103178506BInactive Publication Date: 2016-03-09CHINA UNIV OF MINING & TECH
2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-03-09
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

T he invention discloses a ground protection method for improving transverse selectivity of a coal mine 6-10kV power grid, and belongs to power grid ground protection methods. The method includes: (1) respectively building intelligent subsidiary substations in various converting substations on the ground and under wells, and building a station control layer of a regional centralized control center on the ground as a common station control layer of the intelligent subsidiary substations; (2) collecting bus zero-sequence voltage and zero-sequence current of each branch by the intelligent subsidiary substations, gathering multiple line information by a merging unit, and sorting and sending the information to a process layer network; acquiring zero-sequence fault information of each branch by protection measurement-control device of the intelligent subsidary substations, and determining a branch with faults by ground protection software; (3) determining the fault branch by centralized computing phase information of bus zero-sequence voltage and zero-sequence all-current of each branch; and (4) issuing a trip order to an intelligent terminal by the protection measurement-control device of the intelligent subsidiary substations, and turning off a corresponding switch by the intelligent terminal. Accordingly, ground protection action accuracy is guaranteed, and reliability and safety of power supply system operation are improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a grounding protection method for a power grid, in particular to a grounding protection method for improving the lateral selectivity of a coal mine 6-10kV power grid. Background technique

[0002] Most coal mine power grids are powered by cables, and the environment is harsh. Single-phase leakage or single-phase grounding faults often occur on cable lines. These failures may cause personal electric shock or cause gas and coal dust explosions, and even cause the electric detonator to detonate in advance. Therefore, practical grounding protection measures must be taken to improve the safety and reliability of coal mine power supply.

[0003] At present, the grounding protection suitable for coal mine power grid can be divided into additional DC power detection type, zero sequence voltage type, zero sequence current type and zero sequence current direction type according to its working principle. Each grounding protection princi...

Examples

Embodiment 1

[0016] Embodiment 1: the present invention comprises the following steps:

[0017] (1) Sub-smart substations are built on the ground and underground substations, and a station control layer with a regional centralized control center is built on the ground as the public station control layer of each sub-smart substation, responsible for coordinating and controlling each sub-smart substation; The protection, measurement and control device of the sub-smart substation completes the tripping of the ground fault. The electronic transformer collects the zero-sequence voltage of the busbar and the three-phase zero-sequence current of each line. The merging unit merges and synchronizes the information of multiple branches and uploads it to the process layer network. The measurement and control, metering, wave recording, and various protection devices located in the substation bay layer can obtain zero-sequence voltage and current information from the process layer network, and the grou...