10 kV medium voltage cable hot-line work safety analysis method and system

A technology of safety analysis and live operation, applied in the field of power grid, can solve problems such as difficulty, complicated calculation, affecting the selection of arc suppression measures, etc., to achieve the effect of ensuring safe development and simple and efficient processing

Inactive Publication Date: 2017-12-05
ZHAOTONG POWER SUPPLYING BUREAU OF YUNNAN POWER GRID
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Problems solved by technology

The traditional method for calculating the capacitive current is mainly the formula method, but because the formula method involves multiple parameters of the cable, the calculation is very complicated; in addition, due to the complex changes in the actual working conditions of the cable, it will become very difficult to calculate the capacitive current using the traditional method. And there will be a certain error, which will greatly affect the selection of arc suppression measures

Method used

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  • 10 kV medium voltage cable hot-line work safety analysis method and system
  • 10 kV medium voltage cable hot-line work safety analysis method and system
  • 10 kV medium voltage cable hot-line work safety analysis method and system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1 does not consider operator experience and environmental factors.

[0064] Taking the parameters of a 10kV cable as an example, the length L is 1km, R is 9mm, C1 is 16mm, C2 is 22mm, D1 is 28mm, and D2 is 40mm. Input the values ​​of these 6 parameters into the obtained fitting model (you can set The function of model fitting is designed as a software for users to use, and the specific form in the software window is used to obtain 6 parameters), and the capacitive current is 1.6803A. According to this data, it is recommended to select an arc suppression switch with an arc suppression capability of 5A.

Embodiment 2

[0065] Embodiment 2 is to consider the operator's experience and environmental factors.

[0066] Still taking the above 10kV cable as an example, assuming a more serious situation, if the operator is inexperienced, the humidity in the air is 85%, the wind speed is 5m / s, and the temperature is 35 degrees, then the safety analysis software should be recommended according to the capacitance current. Select an arc suppression switch with an arc suppression capacity of 10A for live operation.

[0067] Correspondingly, the present invention also discloses a system based on the above method.

[0068] The 10kV medium voltage cable live working safety analysis system of the present invention is used to provide arc suppression measures for fracture arcs caused by excessive capacitive currents. The system includes:

[0069] The capacitive current simulation module is used to establish a disconnected no-load cable model based on the PSCAD simulation platform, determine the cable paramete...

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Abstract

The invention discloses a 10 kV medium voltage cable hot-line work safety analysis method and system. The method comprises the steps that 1, based on a PSCAD simulation platform, a disconnection no-load cable model is constructed, cable parameter data of cables of multiple specifications is determined and used as the input of the disconnection no-load cable model, and a set of no-load capacitance current data is obtained through stimulation; 2, based on a MATLAB, by using the cable parameter data of the cables of multiple specifications, the no-load capacitance current data obtained after simulation is subjected to linear fitting, and a fitted model is obtained; 3, the cable parameter data of a cable to be evaluated is acquired and input into the fitted model so that the simulated capacitance current of the cable to be evaluated can be obtained; 4, the simulated capacitance current is used as a reference quantity, and an arc suppression measure is prompted according to an arc suppression strategy. The 10 kV medium voltage cable hot-line work safety analysis method and system can provide corresponding theoretical guidance basis for hot-line work and guarantee safe implement of the cable hot-line work.

Description

technical field [0001] The invention relates to the field of power grids, in particular to a safety analysis method and system for 10kV medium-voltage cable live work. Background technique [0002] With the expansion of urban distribution network construction, a large number of overhead lines are replaced by power cables. Since the ground capacitance of cables is dozens of times that of overhead lines, the capacitive current of the grid increases significantly. Excessive capacitive current will cause excess capacitive reactive power in the system, resulting in an increase in the voltage at the end of the distribution network, causing overvoltage and arcing at the break when the live cable is disconnected, which will endanger the safety of the distribution network and affect the quality of the distribution network in severe cases. power supply reliability. The arc intensity will be directly related to the safety of the workers, so when the capacitive current is too large, th...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/367G06F2113/16
Inventor 王彧杨华文刘毅高代勇彭沧钿马永勇
Owner ZHAOTONG POWER SUPPLYING BUREAU OF YUNNAN POWER GRID
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