Metering performance calibrator for large grounding system ground resistance tester
A technology of grounding resistance and calibration device, applied in the direction of measurement device, measurement of electrical variables, instruments, etc., can solve the problems of inconsistent test conditions, large difference in test values, exceeding index requirements, etc., and achieve the effect of perfect performance evaluation.
Inactive Publication Date: 2015-02-18
STATE GRID CORP OF CHINA +3
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Therefore, the value of the auxiliary grounding resistance does not meet the actual working requirements of the large grounding grid grounding resistance tester
[0011] 3) The detection conditions for the influence of ground voltage do not match the actual test conditions of the large-scale ground grid ground resistance tester
The same interference has little effect on the measurement of 20Ω resistance, but has a great influence on the measurement of 0.5Ω resistance, which will exceed the specification requirements
[0012] 4) The influence of factors such as self-inductance of the ground grid and crosstalk between test leads on the grounding resistance test of the large-scale ground grid cannot be ignored, but these influencing factors have not been detected in the existing technology
[0013] Many of the above factors lead to many large-scale grounding grid grounding resistance testers that are qualified in accordance with the existing technical regulations. The test values vary greatly when used in the field, and some instruments cannot even work normally, which brings great confusion to the safety assessment of the grounding system.
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[0029] The metering performance verification device of the large-scale ground grid grounding resistance tester proposed by the present invention, its wiring schematic diagram is as follows figure 2 shown. The measurement performance verification device includes a single-phase auto-coupling voltage regulator T 1 , the first isolation transformer T 2 , the second isolation transformer T 3 , AC ammeter A1, AC voltmeter V1, variable standard resistor R E , inductance L E , variable voltage pole auxiliary grounding resistance R P1 , variable current pole auxiliary grounding resistance R C1 , coupling capacitance C CP , line resistance R C线 , the first voltage test hole P 1 , the first current test hole C 1 , the second voltage test hole P 2 , the second current test hole C 2 ; The second current test hole C 2 Connected to the left side of the AC ammeter A1; the AC ammeter A1 with the variable standard resistor R E and inductance L E in series; the single-phase autovo...
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The invention relates to a metering performance calibrator for a large grounding system ground resistance tester and belongs to the technical field of large grounding system ground resistance testing. The metering performance calibrator is applied to calibrating metering performances: error of indication, influence of auxiliary ground resistors upon the error of indication, influence of ground voltage upon the error of indication, influence of grounding system self-inductance upon the error of indication and influence of inter-test-line crosstalk upon the error of indication. The metering performance calibrator has the advantages that anti-jamming capability of the large grounding system ground resistance tester can be quantitatively estimated, the influence of the grounding system self-inductance and that of the inter-test-line crosstalk are considered, the large grounding system ground resistance tester is allowed to operate in reality simulation environments, and effectiveness in assessing the performances of the large grounding system ground resistance tester is guaranteed.
Description
technical field [0001] The invention relates to a measurement performance verification device of a large-scale grounding resistance tester, and belongs to the technical field of large-scale grounding resistance testing. Background technique [0002] The grounding resistance of the ground grid is an important basis for ground grid design, construction acceptance, operation and maintenance, and an important indicator to ensure the safe operation of power generation, transformation, distribution, and power consumption systems. According to DL / T 475-2006 Electric Power Industry Standard of the People's Republic of China: Guidelines for Measurement of Grounding Device Characteristic Parameters, grounding devices can be divided into two categories: general grounding devices and large-scale grounding devices. Among them, large-scale grounding devices refer to "substations with a voltage level of 110kV and above, thermal power plants and hydropower plants with an installed capacity ...
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IPC IPC(8): G01R35/00
Inventor 端木林楠胡晓晖李雨彭珑马继先马鑫晟赵媛胡学军
Owner STATE GRID CORP OF CHINA
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