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Extreme high voltage direct-current non-contact distance-measurement electricity-testing method

A UHV DC, non-contact technology, used in measuring devices, electrostatic field measurement, electromagnetic wave re-radiation, etc., can solve the problems of low accuracy and poor repeatability of electrical inspection results, and achieve high accuracy.

Inactive Publication Date: 2010-11-03
STATE GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
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Problems solved by technology

[0006] The beneficial effect of the present invention is: because the present invention is based on measuring the distance between the electroscope and the wire and according to the field strength curve and the change trend of the space electric field to determine the electroscope value to carry out the electroscope, compared with the previous method Compared with higher accuracy, it can effectively detect whether the object under test is charged or not, and solve the problem of poor repeatability and low accuracy of electric test results caused by the interference of charged objects adjacent to the device under test on the spatial field strength

Method used

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  • Extreme high voltage direct-current non-contact distance-measurement electricity-testing method

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Embodiment

[0024] There are different field strength values ​​at different distances X below the DC transmission wire, and the alarm threshold Y of the electroscope is different according to the field strength value. Therefore, according to a certain voltage level, the value collected by the electroscope at a distance of x meters below the wire is compared with the alarm threshold value y Judging whether the DC transmission wire is charged or not, where x is a range of distance from the wire, and its size changes according to the change of voltage level (for example, x for ±500kV DC is 20m~25m, and the alarm threshold y is 1.8 (1.8 is more The value of y is different in different occasions and should be determined according to the specific situation)).

[0025] Electricity test process

[0026] 1. Select a suitable working point, try to minimize the number of live equipment around, and reduce the interference of other live equipment on the electroscope.

[0027] 2. Carry out self-inspec...

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Abstract

The invention relates to an extreme high voltage direct-current non-contact distance-measurement electricity-testing method which is divided into self-checking, data processing, comparison and acousto-optic alarming, and the method further comprises a distance-measurement and detecting phase, after self-checking is passed, detection is carried out; the detection adopts the induction principle of alternating induction method to test electricity, data acquisition of electric-field strength of the working position of an electroscope is carried out with a certain frequency, and the value after multiple tests is used as an alarming threshold value; and then distance measurement is carried out, the corresponding field intensity value is obtained from the distance value according to the field intensity and variation trend of a space electric field and is used as the electricity-testing value; the alarming threshold value and the electricity-testing value are compared, whether the tested object is electrified is reflected by acousto-optic signal alarming; the method adopts the distance-measurement mode to obtain the electricity-testing value, and the method is more accurate, and has low error and high precision compared with the existing electricity-testing value obtaining method, so as to effectively detect whether the tested lead wire is electrified.

Description

technical field [0001] The invention belongs to the field of research methods of safety tools for ultra-high voltage direct current transmission and transformation equipment, and in particular relates to an ultra-high voltage direct current non-contact distance-measuring electric inspection method. Background technique [0002] Operation and maintenance work is an important means to grasp the operation status of power grid equipment, discover and deal with equipment defects in time. The "State Grid Corporation Electricity Safety Work Regulations (Power Line Part)" clearly stipulates that before working on some electrical equipment that is powered off or installing grounding wires in the working section of a power outage line, an electrical test must be performed to verify that the equipment or lines are indeed without voltage. The electroscope is one of the common tools used to detect whether there is voltage on the electric equipment. Through the electroscope, it can be cle...

Claims

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Application Information

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IPC IPC(8): G01R19/145G01R29/12G01S17/08
Inventor 邵瑰玮易辉张丽华胡霁陈怡文志科闵绚董万光焦坦
Owner STATE GRID ELECTRIC POWER RES INST
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