Deep well non-coal mine underground traction network protection method and system

A protection system and traction net technology, which is applied in the field of traction net protection in deep mines and non-coal mines, can solve problems affecting work progress and underground safety and environment, and achieve the effects of fast action speed, high reliability, and simple protection criteria

Pending Publication Date: 2022-07-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the fault location cannot be identified in time, it will not only affect the normal work progress, but also have a great impact on the underground safety environment

Method used

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  • Deep well non-coal mine underground traction network protection method and system
  • Deep well non-coal mine underground traction network protection method and system
  • Deep well non-coal mine underground traction network protection method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0077] Embodiment 2: The purpose of the present invention is to provide a protection method and system with high reliability that can accurately identify the failure of the traction network in deep mines and non-coal mines. The invention firstly builds a deep mine non-coal mine underground traction network model in PSCAD / EMTDC, the pole line length is 40km, the voltage level is ±600V, the sampling frequency is 100Hz, and the sampling interval time is 0.01ms. Set the fault location of the traction grid pole line as f 1 , f 2 , f 3 , are respectively 15km away from the rectifier side, 20km away from the rectifier side, 25km away from the rectifier side, and the fault types are single-pole grounding fault through 50Ω transition resistance and single-pole grounding fault through 100Ω transition resistance.

[0078] The specific steps of the protection method are:

[0079] Step1: Collect the electric quantity of the traction network pole line, and obtain the current amplitude of...

Embodiment 3

[0110] Example 3: The present invention first builds a deep mine non-coal mine underground traction network model in PSCAD / EMTDC, the pole line length is 40km, the voltage level is ±600V, the sampling frequency is 100Hz, and the sampling interval time is 0.01ms. Set out-of-area fault location f M , f N , respectively at the outlet of the rectifier side and the system at the inverter side. The fault types are ground fault through 0.1Ω transition resistance, ground fault through 100Ω transition resistance, phase A ground fault through 0.1Ω transition resistance, and three-phase short-circuit fault through 0.1Ω transition resistance.

[0111] like figure 1 As shown, a deep well non-coal mine underground traction net protection method, the specific steps are:

[0112] Step1: Collect the electric quantity of the traction network pole line, and obtain the current amplitude of multiple consecutive collection points.

[0113] Step2: Perform the difference operation on the current ...

Embodiment 4

[0128] Example 4: as Figure 5 As shown, a deep mine non-coal mine underground traction net protection system includes:

[0129] The data acquisition module 301 mainly collects the electrical signals of the protected pole lines;

[0130] The data processing module 302 processes the collected electrical signals to obtain the current amplitude, and calculates the current gradient and S;

[0131] The protection criterion module 303, according to the current gradient sum S and the setting value S set the relationship between them constitutes a protective criterion;

[0132] The protection execution module 304 acts on the protection trip; or the blocking does not operate, and records the operation situation;

[0133] Wherein, the data collection module 301 specifically includes:

[0134] The analog quantity acquisition unit 3011 is used to collect the current analog quantity signal of the traction grid pole line;

[0135] The data storage unit 3012 is used to store the current...

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Abstract

The invention relates to a deep well non-coal mine underground traction network protection method and system, and belongs to the technical field of power system protection. The method comprises the following steps: firstly, acquiring traction network polar line electrical quantity to obtain current amplitudes of adjacent acquisition points within a certain acquisition time; calculating a current amplitude difference delta I according to the current amplitudes of the adjacent acquisition points; calculating an amplitude change gradient dI according to the current amplitude difference; solving a current gradient S according to the amplitude change gradient; comparing the current gradient sum with a setting value so as to judge internal and external faults; on the premise that the positive direction is stipulated, if the obtained current gradient S is larger than a preset setting value Sset, the action is judged as an internal fault protection action; and if the obtained current gradient S is smaller than a preset setting value Sset, judging that the current gradient S is an internal fault protection action. The method is applied to deep well non-coal mine underground traction network polar line protection, the protection method is suitable for various fault types and can be suitable for power transmission line protection under various complex working conditions, the protection criterion is simple, reliability is high, and the action speed is high.

Description

technical field [0001] The invention relates to a deep mine non-coal mine underground traction network protection method and system, and belongs to the technical field of power system protection. Background technique [0002] With the modernization of the mining industry, more and more electrical equipment is applied to mining, which greatly improves the convenience and efficiency of mining, and makes the underground power supply system increasingly complex. Due to the heavy electrical equipment used in mining, the power is generally large, and the voltage of the underground transmission line is high voltage, which greatly increases the danger of electrical failure. Compared with the general power supply places, the space under the mine is relatively narrow, and the air is humid, and there are dangers such as siding and roof falling, which have a great impact on the safety and maintenance of the equipment. Therefore, the power supply circuit and electrical equipment in the m...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01R31/08G01R19/10H02H3/44
CPCG01R31/086G01R31/088G01R19/10H02H3/44Y02E40/40
Inventor束洪春胡毅男雷顺广
OwnerKUNMING UNIV OF SCI & TECH