Operation method without power failure at the operation point
An operation point and operation technology, applied in the direction of overhead lines/cable equipment, etc., can solve the problems of difficult implementation, poor safety of live work, complicated methods, etc., and achieve the effect of convenient implementation, high reliability and high accuracy
Active Publication Date: 2021-08-03
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
[0004] The reliability of the current live working method without power failure in the power system is relatively low, which makes the safety of live working relatively poor, and the personal safety of operators cannot be strongly guaranteed; moreover, the method is complicated and difficult to implement
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Embodiment Construction
[0032] Such as figure 1 Shown is the schematic flow chart of the method of the present invention: the non-stop operation method of this operation point provided by the present invention comprises the following steps:
[0033] S1. Obtain the line parameters of the non-stop operation line;
[0034] S2. Determine the operation phase and operation point of the non-stop operation line;
[0035] S3. Calculate the electrical distance between the operating point and the neutral point according to the line parameters obtained in step S1 and the operating phase and operating point determined in step S2; specifically, the following steps are used to calculate the electrical distance:
[0036] A. The substation and distribution network line branch nodes are regarded as nodes, and the line branch nodes are numbered with the substation as the center;
[0037] B. Obtain the distance between each node to form a distance matrix between nodes; specifically, if there is a direct connection wir...
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The invention discloses a method for non-stop operation at an operation point, which includes obtaining line parameters of the non-stop operation line; determining the operation phase and the operation point of the non-stop operation line; calculating the electrical distance between the operation point and the neutral point; The zero-sequence current value that needs to be injected at the neutral point during operation; the zero-sequence current value obtained by injecting the current injection device at the neutral point; remove the current injection device after the operation is completed, and the operation without power failure is completed. The present invention can conveniently and quickly obtain the shortest electrical distance from any line branch node to the substation after obtaining the construction data in the early stage and measuring and calibrating in the later stage to obtain the shortest electrical distance from the branch node of any line to the substation, thereby obtaining zero-sequence current value; the method of the present invention has high precision, and when the power grid is expanded, the expansion of the method of the present invention can be realized only by updating the distance matrix between nodes, with high reliability and convenient implementation.
Description
technical field [0001] The invention belongs to the field of electrical automation, and in particular relates to a method for operating a working point without power failure. Background technique [0002] With the development of economy and technology and the improvement of people's living standards, electric energy has become an indispensable secondary energy source in people's production and life, bringing endless convenience to people's production and life. Therefore, ensuring a stable and reliable supply of electricity has become one of the most important tasks of the power system. [0003] The non-stop operation of the power system is one of the important measures to ensure the continuous and reliable power supply of the power system. However, when working with live wires, the safety of workers will be threatened to a certain extent. Therefore, how to ensure the safety of workers during live-line work in the power system has become one of the important tasks of the po...
Claims
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IPC IPC(8): H02G1/02
CPCH02G1/02
Inventor 朱亮杨琪曾祥君邓志勇汪志刚毛盾喻坤徐溧郭昊胡斌
Owner STATE GRID HUNAN ELECTRIC POWER