Transmission grid fault detection system and method based on internet of thing technology

An Internet of Things technology and fault detection technology, applied in the transmission network fault detection system and field based on Internet of Things technology, can solve the problems of no data transmission and analysis technology, and achieve convenient and efficient troubleshooting, reduce the scope of power outages, and improve versatility Effect

Inactive Publication Date: 2013-10-30
CHANGSHU DYNASTY INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing methods only use simple electronic circuit technology without data transmission and analysis technology. At the fault site, when the current or voltage fails, the magnetic field attracts the indicating mechanism to make the fault indicator turn to the red position. After the fault is eliminated , the indicator needs to be reset to white, and personnel are required to search on site

Method used

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  • Transmission grid fault detection system and method based on internet of thing technology
  • Transmission grid fault detection system and method based on internet of thing technology
  • Transmission grid fault detection system and method based on internet of thing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1, phase-to-phase short-circuit fault handling

[0042] The fault detection system runs on the overhead transmission line, such as Figure 6 As shown, the first slave machine 1, the second slave machine 3, and the first master machine 2 form the first detection terminal 1; the third slave machine 4, the fourth slave machine 6, and the second master machine 5 form the second detection terminal 2; The fifth slave machine 7, the sixth slave machine 9, and the third master machine 8 form the third detection terminal 3, and the first slave machine 1, the first master machine 2, and the second slave machine 3 respectively detect the three phases of line A, B, and C of line 2 Power transmission line, the third sub-unit 4 and the fifth sub-unit 7 detect the A-phase line of the a branch, the second main unit 5 and the third main unit 8 detect the a-branch B-phase line, the fourth sub-unit 6, and the sixth sub-unit 9 Check the C-phase line of the a branch. When a...

Embodiment 2

[0043] Embodiment 2, single-phase ground fault processing

[0044] The fault monitoring system is connected to the overhead transmission line for operation. When a single-phase ground fault occurs, such as Figure 7 As shown, the first slave machine 1, the second slave machine 3, and the first master machine 2 form the first detection terminal 1; the third slave machine 4, the fourth slave machine 6, and the second master machine 5 form the second detection terminal 2; The fifth slave machine 7, the sixth slave machine 9, and the third master machine 8 form the third detection terminal 3, and the first slave machine 1, the first master machine 2, and the second slave machine 3 respectively detect the three phases of line A, B, and C of line 2 Power transmission line, the third sub-unit 4 and the fifth sub-unit 7 detect the A-phase line of the a branch, the second main unit 5 and the third main unit 8 detect the a-branch B-phase line, the fourth sub-unit 6, and the sixth sub-un...

Embodiment 3

[0045] Embodiment 3, open circuit fault processing

[0046] According to the feature of sudden power failure of the line after the open circuit fault occurs on the overhead transmission line, the present invention designs a line on-off detection circuit to detect the on-off situation of the power system in each line in real time, and judge whether there is an open circuit fault. Open circuit fault judgment circuit such as Figure 4 Shown: The sensor input signal is rectified by diode D1, current limiting resistor R1, filter capacitor C1, and Zener diode D2 are stabilized and enters the LM334 constant current source, and the feedback resistor R2 is set to make the output current provide input for the subsequent photocoupler 6N139 , The output terminal of the photocoupler 6N139 is connected to the power supply through the pull-up resistor R3, and at the same time connected to the MCU detection port. In the case of normal operation of the line, the constant current source always...

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Abstract

The invention relates to a transmission grid fault detection system and method based on an internet of thing technology. The method is characterized by: monitoring online and in real time whether changes of the voltage and current of a high-voltage transmission line three-phase fixed point are balanced by utilizing a three-phase zero sequence voltage and a current balance measurement method; and judging whether the fixed point of a high-voltage overhead line is abnormal based on the change features of the voltage and the current under various conditions. The system comprises grounding, open circuit and short circuit fault diagnoses. The system and method of the invention enable fault monitoring level to be improved, wherein the short circuit fault alarm accuracy can reach more than 98.5%, and the grounding fault alarm accuracy can reach more than 97%. A detection device possesses a self-learning function, namely, a plurality of threshold values do not need to be set according to the transmission lines with different loads, so that the workload before putting the detection device into use is reduced, the universality is improved, the power cut range is reduced, the power cut time is shortened, and the power supply reliability is improved substantially.

Description

technical field [0001] The invention belongs to the fields of electric power system emergency communication, distribution network automation, smart grid and communication technology, and specifically relates to a transmission network fault detection system and method based on Internet of Things technology. Background technique [0002] At present, the method of collecting short-circuit fault signals of distribution lines mainly relies on the fact that when a short-circuit fault occurs, the power transmission and distribution line will have overcurrent phenomenon. A good threshold is compared to determine whether there is a fault. That is, when the acquired signal value is greater than the set threshold, it is considered that a short circuit fault has occurred. However, due to the different workloads of the overhead transmission and distribution lines, the strength of the electrical signals obtained from the transmission and distribution lines is also different. Different t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCY04S10/522Y04S10/52
Inventor 王铮王珮
Owner CHANGSHU DYNASTY INFORMATION TECH
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