A step voltage test method for UHV DC vertical ground electrode
An ultra-high voltage DC, vertical ground electrode technology, applied in the direction of measuring current/voltage, only measuring voltage, measuring device, etc., can solve the problems of limited accuracy, small test current, inaccurate step voltage, etc., to achieve good electrical performance, Avoid errors, good practical effect
Active Publication Date: 2019-01-04
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology
The test current of this method is small, generally not more than 200A. Although the step voltage value of the ground electrode can be tested, the step voltage generated on the ground electrode is relatively small due to the small current injected into the ground electrode. Small, usually at the mV level, the voltmeter or multimeter used in the test step voltage test has limited precision, and cannot accurately read the step voltage value of the ground electrode, and the current conversion will introduce new errors, so this The step voltage obtained by the test method is not accurate enough
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Embodiment 1
[0023] The vertical grounding electrode type of the grounding electrode of the ±800kV Pu'er converter station was adopted for the first time in China. The ground electrode site is located in Qianying Village, Yongping Town, Jinggu Dai and Yi Autonomous County, Pu'er City, Southern Province. The maximum design voltage is 35kV, the transmission capacity of the DC system is 5000MW, the maximum continuous rated current is 3125A, the maximum The state current (3s) is 4539A, and the maximum allowable step voltage is 9.72V.
[0024] The design value of the grounding resistance is 0.162Ω (calculated value), which is designed according to the system conditions, the topographic characteristics of the pole site and the soil parameters of the pole site. There are 40 vertical electrode wells on the outer ring and 23 vertical electrode wells on the inner ring. The electrode rod is 30m long, the top of the electrode is about 5m from the ground, and the diameter of the electrode well is 1.2m....
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The invention discloses a step voltage testing method for an ultra-high voltage direct-current vertical grounding electrode. The step voltage testing method comprises the following steps: testing when debugging a grounding electrode, dividing an inner ring and an outer ring of the grounding electrode into four quadrants, respectively selecting 4-6 electrode wells as reference testing points from four quadrant areas of the outer ring, testing, respectively selecting 3-4 electrode wells as reference testing points from four quadrant areas of the inner ring, measuring, respectively selecting multiple testing points from the ground around each reference testing point in a unit of 1m, testing so as to obtain multiple step voltage values by using a multimeter, and selecting the maximum step voltage value as a step voltage value of the reference testing point. By adopting the step voltage testing method disclosed by the invention, relatively large voltage can be injected into a grounding electrode site, rated grounding current of the grounding electrode can be met, and the electric property of the grounding electrode can be well reflected by testing the step voltage under the rated grounding current.
Description
technical field [0001] The invention relates to the technical field of step voltage testing of vertical grounding electrodes, in particular to a step voltage testing method of UHV DC vertical grounding electrodes. Background technique [0002] The UHVDC grounding pole can transmit power to the system for a long time, improve the reliability of the system operation and clamp the neutral point potential of the converter station (rectifier valve), so as to avoid damage to the equipment caused by the voltage imbalance between the two poles and the ground. The injection of strong direct current into the ground through the ground electrode will cause the earth potential of the pole site to rise, and new problems such as step voltage, soil heating, and electrode corrosion will appear. [0003] At present, the main arrangement of grounding electrodes in China is horizontal grounding electrodes, but the horizontal grounding electrodes occupy a large area. Applied to DC engineering. ...
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IPC IPC(8): G01R19/00
CPCG01R19/0084
Inventor 李红元彭翔陈禾许毅潘凯龙方宇周禹
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID