A test method suitable for studying the grounding form of 10kv line arrester
A technology of line arrester and test method, applied in the direction of overhead line/cable equipment, cable installation, installation of lighting conductors, etc., can solve problems such as damage, 10kV line arrester not mentioned, increase line lightning protection cost, etc.
Active Publication Date: 2017-08-25
ELECTRIC POWER RES INST STATE GRID JIANGXI ELECTRIC POWER CO +2
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Problems solved by technology
However, this utility model has the following problems: when the lightning current amplitude is large, a large voltage will be generated when it passes through the grounding resistance and enters the ground, causing the grounding terminal of the arrester to increase the ground potential, and this potential difference is added to the steel bars and crossarms inside the tower. At both ends of the insulation, the weak insulation of the cement tower will still be damaged, and the separate laying of the grounding down conductor will also increase the cost of lightning protection of the line
[0008] In addition, most of the patents on lightning protection for 10kV distribution overhead lines do not mention how to systematically study the test method of the grounding down-conducting form of 10kV line arresters installed on concrete towers
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[0025] Specific embodiments of the present invention are as follows figure 1 shown.
[0026] The specific implementation steps are briefly described as follows:
[0027] (1) Build a 10kV distribution line test model, and the selected equipment model should be consistent with the actual line, such as figure 1 The layout shown includes 10kV cement pole tower 1, iron cross arm and hoop 2, 10kV line insulator 3, 10kV line outer string gap arrester 4, analog wire 5, grounding down-conductor 6, impulse voltage generator 7, tower grounding Resistor 8.
[0028] The 10kV cement pole tower 1 is erected by the aerial crane, and the iron cross arm 2 is fixed on the 10kV cement pole tower 1 through the hoop;
[0029] Fix the base of the 10kV line insulator 3 on the iron cross arm 2, the analog wire 5 is bound to the upper end of the 10kV line insulator 3, and the outer string gap arrester 4 for the 10kV line is installed in parallel on both sides of the 10kV line insulator 3 according t...
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A test method suitable for studying the grounding form of a 10kV line arrester, the method includes: building a test model of a 10kV power distribution line, the type of equipment selected should be consistent with the actual line, and the model layout includes 10kV concrete tower (1), iron cross-arm And hoop (2), 10kV line insulator (3), 10kV line outer series gap surge arrester (4), analog wire (5), grounding down conductor (6), impulse voltage generator (7), tower grounding resistance (8); The internal reinforcement of the concrete tower is always effectively grounded; the lightning impact comparison test is carried out under the conditions of laying the grounding downconductor separately and grounding through the grounding device, and not laying the grounding downconductor separately through the natural grounding of the tower. The invention studies how to adopt a reasonable grounding form for a line lightning arrester, so as to have a positive effect on the lightning protection of a power distribution line and provide guidance for actual engineering design.
Description
technical field [0001] The invention relates to a test method suitable for studying the grounding form of a 10kV line lightning arrester, and belongs to the field of lightning protection of distribution lines. Background technique [0002] The distribution line is the first level in the power system that is closer to the users. It is responsible for supplying power to industrial and agricultural production and the daily life of residents. It has the characteristics of complex line structure, large number of lines, and wide coverage. In the past, the idea of focusing on the main network light distribution network existed for a long time, resulting in a large gap between the current distribution network equipment status and technical level compared with the main network. The insulation level of distribution lines is relatively low, and there is generally no special lightning protection measures, which are not only affected by direct lightning strikes, but also insulator flas...
Claims
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IPC IPC(8): H02G1/02H02G13/00
Inventor 王华云郑蜀江陈子涵安义蔡木良王羽李博江刘蓓潘建兵
Owner ELECTRIC POWER RES INST STATE GRID JIANGXI ELECTRIC POWER CO