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Method for preventing power grid equipment from transmitting power with earth point and scheduling system

A technology of power grid equipment and dispatching system, applied in the direction of measuring electricity, circuit devices, electrical components, etc., to avoid secondary shocks

Active Publication Date: 2019-10-01
STATE GRID HEBEI ELECTRIC POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a simple and effective method for judging the grounding point of power grid equipment for the maintenance and dispatching system. The technical method of grounding judgment of the line section outside the station to make up for the lack of on-site information in the existing technology

Method used

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  • Method for preventing power grid equipment from transmitting power with earth point and scheduling system
  • Method for preventing power grid equipment from transmitting power with earth point and scheduling system
  • Method for preventing power grid equipment from transmitting power with earth point and scheduling system

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Embodiment 1

[0033] This embodiment is a method for preventing power grid equipment from transmitting power with a grounding point, which is applied to such as figure 1 The dispatching system shown, the dispatching system includes: (1) measurement module, that is, the voltage signal detection terminals 41 and 42 fixedly connected to the grid equipment 10 in the figure; and the switch state connected to the switch units 21 and 22 of the grid equipment 10 Detection terminals 31, 32; (2) processing module, that is, the processor in the remote server 50 that outputs the power transmission enable signal 60 in the figure to perform the running task; (3) storage module, that is, the remote server 50 in the figure memory, disk or network storage drive for storing data in the end server 50. The remote server 50 is communicatively connected with the voltage signal detection terminals 41 , 42 and the switch signal detection terminals 31 , 32 . The grid device 10 is electrically connected to other gr...

Embodiment 2

[0043] This embodiment is a method for preventing grid equipment from transmitting power with a grounding point, and it is applied to a dispatching system. 32 and the voltage signal detection terminals 41, 42, the temperature, humidity and other environmental sensors arranged around the grid equipment 10, as well as the working state sensors of other grid equipment around the grid equipment 10, can also be used to obtain the factors that affect the electromagnetic field factors in the space around the grid equipment 10. Parameters, using these parameters to classify each first electrical connection state mark of the grid equipment 10, such as extracting the ambient temperature, ambient humidity, and ambient The voltage value and current value of the grid equipment with large radiated power divide the first electrical connection state with one electrical connection structure into multiple categories, so as to facilitate the detailed comparison between the first electrical connec...

specific Embodiment 1

[0053] Such as image 3 As shown, the power grid equipment in this specific embodiment is a loop line in a section of the same-tower double-circuit line of the 500kV distribution network, that is, the outage line is the line AB between the substation A and the substation B, and there is a same-tower line around it. Loop line CD, whether there is a grounding point on the outage line has a great influence on the induced voltage at both ends of the line. When the outage line has no grounding point, the induced voltage is mainly the capacitive voltage division of the live line on it, with a large amplitude and close phase angle; when there is a grounding point, the induced voltage is mainly the mutual inductance voltage of the live line on it, Amplitude is small.

[0054] Under normal circumstances, after the A side of the line AB substation is disconnected from the busbar, and the busbar of the B side of the substation is also disconnected, that is, after the line AB is out of s...

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Abstract

The invention discloses a method for preventing power grid equipment from transmitting power with an earth point and a scheduling system, and belongs to the technical field of maintenance of power systems. The method comprises the steps of setting a measurement point with a fixed position at the power grid equipment; acquiring first sensing voltage data of the measurement point when the power gridequipment is in a first electrical connection state without the earth point; when the power grid equipment is in a second electrical connection state before the execution of a first power transmission step, detecting second sensing voltage data of the measurement point; if the second sensing voltage data is the same as the first sensing voltage data, executing the power transmission step, whereinthe second electrical connection state is corresponding to the first electrical connection state. The invention provides the simple and efficient equipment earthing judgement technical means for thescheduling personnel not at the maintenance site, on the one hand, the problem that the scheduling staff grasps the earth wire information by only depending on the report of the maintenance site is solved, and on the other hand, the technical blank of earthing judgment in closed equipment and at line section outside the station is filled.

Description

technical field [0001] The invention belongs to the technical field of electric power system maintenance, and in particular relates to a method and a dispatching system for detecting whether there is a grounding point in power grid equipment before power transmission. Background technique [0002] Power grid equipment includes lines, busbars, main transformers, etc. in the transmission and distribution network. According to the electrical connection state of the power grid equipment, the power grid equipment can be divided into a power failure state and a live state, wherein the power failure state includes a hot standby state and a cold standby state, and the live state includes a running state. It becomes live, that is, the power transmission of the grid equipment. Power transmission includes at least two modes: a. switch the electrical connection status of grid equipment sequentially in the order of cold standby, hot standby, and operation; b. switch the electrical conne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02J3/00
CPCG01R31/086G01R31/088H02J3/00H02J2203/20
Inventor 赵春雷赵自刚孙广辉王鑫明李世辉贾晓卜张飞飞李少博郜建祥尹楠
Owner STATE GRID HEBEI ELECTRIC POWER CO LTD
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