Single-core high-voltage cable joint intelligent monitoring system and intelligent monitoring method

A high-voltage cable, intelligent monitoring technology, applied in measuring devices, measuring heat, measuring electrical variables, etc., can solve the problems of incomplete parameter analysis method, incomplete monitoring data, cable explosion, etc., to prevent untimely reporting of parameters or Inaccurate, accurate cable operating conditions, and the effect of saving misrepair costs

Active Publication Date: 2018-02-23
李成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. At present, most cable temperature monitoring equipment can monitor the surface temperature of the cable joint, but it is not accurate and timely enough to judge the working condition of the cable only by the surface temperature of the cable, and one party cannot accurately know the temperature of the cable core. The actual value, and the second is that it is impossible to know exactly the time label corresponding to the temperature value
[0009] 2. The cable will form a large circulating current in its shielding layer. In severe cases, it can reach 50% to 90% of the main current, that is, tens of amperes or even hundreds of amperes. The loss is very large, and the cable may even explode, affecting the power system. The safe operation of the cable head, and the current cable head detection device is relatively deficient in the technology of evaluating the cable shielding layer
[0010] 3. The value of the grounding cable and the grounding box is high, so it attracts some criminals to steal
[0011] Therefore, it is very important to ensure the safe operation of the power grid and improve the management efficiency of the power sector, but the existing cable monitoring technology is not mature enough, mainly reflected in: 1. The detection accuracy is not high, and it is impossible to reflect the cable at a certain time node in time. The most realistic temperature information of the core
2. The monitoring range is limited, and it is impossible to monitor many important data through one system, resulting in incomplete monitoring data, which cannot reflect the most realistic working conditions of the cable operation; 3. The parameter analysis method is incomplete, and also cannot reflect the most Real working conditions, and may generate false positives

Method used

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  • Single-core high-voltage cable joint intelligent monitoring system and intelligent monitoring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] For cable temperature monitoring:

[0101] Preset the temperature comparison value in the acquisition controller: the ambient temperature T1, the cable surface temperature T2, and the core temperature T3 are all <60°C, the first difference ΔT21<5°C, the second difference ΔT32<10°C; and : A change in the first difference ΔT21 greater than 5°C within 1 hour is considered abnormal; a rise of 5°C within 1 hour for T2 and T3 is considered abnormal.

[0102] The acquisition controller collects data every 5 minutes. The current collected data is that the ambient temperature T1 is 25°C, the cable surface temperature T2 is 27°C, and the core temperature T3 is 29°C; and calculate the first difference ΔT 21 =2°C, everything is within the normal data; then the data is transmitted to the central platform every 12 hours.

[0103] For ground wire current monitoring:

[0104] In the acquisition controller, the preset value of the grounding current of the three-phase wires connected t...

Embodiment 2

[0115] For cable temperature monitoring:

[0116] The acquisition controller collects data every 5 minutes. The current collected data is that the ambient temperature T1 is 25°C, the cable surface temperature T2 is 31°C, and the core temperature T3 is 32°C; and calculate the first difference ΔT 21 =4℃, the second difference ΔT 32 =3°C, where the first difference is ΔT 21 =6℃ is an abnormal value

[0117] The collection controller shortens the data collection time to once every 2 minutes.

[0118] The data collected three times in a row is in an abnormal state, and the collector immediately sends the abnormal state data to the central platform. And send data to the central platform every 4 minutes thereafter.

[0119] The central platform issues early warnings to clients and smart terminals.

[0120] For ground wire current monitoring:

[0121] The acquisition controller collects the A-phase ground current I1A=61; the B-phase ground current I1B=62, and the C-phase ground ...

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PUM

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Abstract

The invention relates to an intelligent monitoring system and an intelligent monitoring method for a single-core high-voltage cable joint, wherein the intelligent monitoring system is composed of a central platform, a client terminal, and an intelligent terminal, and a temperature monitoring module, a current monitoring module, an anti-theft sensor, and a cable local discharge sensor. The invention collects cable temperature, ground wire current, cable partial discharge, and equipment anti-theft, compares them with relevant parameters set in the system, and regularly uploads the monitored parameters to the central platform. parameter interval. The present invention realizes all-round online real-time monitoring of important parameters of cable operating conditions, including cable temperature index, anti-theft monitoring, and current pulse information monitoring of cable shielding layer grounding wire, avoids the possibility of conventional false alarms, and saves mistaken repairs cost.

Description

technical field [0001] The invention relates to the field of power transmission cable security facilities, which are used for monitoring the safety of underground ground cable power transmission. Background technique [0002] At present, the development and construction of cities are inseparable from electricity, and in the construction of power facilities, the construction scale of underground power grids continues to expand. As the core carrier of power transmission, cables have been widely used in underground power grids. However, the corresponding safety issues of cables It is not difficult to find after research that more than 90% of the cable accidents occur in the cable joints, so all-round monitoring of the operation status of the cable joints is of great significance to the safe operation of the underground power grid. [0003] In recent years, there have been many accidents at home and abroad that caused the thermal collapse of the cable due to the load exceeding i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K13/00G01R19/165G01R31/12G08B13/02
Inventor 李成
Owner 李成
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