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Method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors

A resistance measurement and sampling circuit technology, applied in software algorithms, eliminates the error field of high-voltage insulation resistance measurement sampling circuits above 2kV, can solve complex problems, and achieves the effect of reducing requirements, simplifying algorithms, and improving measurement accuracy

Inactive Publication Date: 2019-03-15
中国船舶重工集团公司第七〇三研究所无锡分部
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Problems solved by technology

In order to avoid being too complicated, the current software algorithm ignores the influence of the sampling resistor Rt on the measurement accuracy

Method used

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  • Method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors
  • Method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors
  • Method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors

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Embodiment Construction

[0042] Please refer to figure 2 , in an embodiment of the present application, the method for calculating and eliminating the error of the high-voltage insulation resistance measurement sampling circuit includes:

[0043] S2: Set two voltage divider resistors RT with the same resistance value to ground inside the insulation monitor host;

[0044] S4: Measure the voltages VH and VL of the bus bar to ground through the voltage dividing resistors to ground, wherein the two contrasting voltage dividing resistors are represented by RH and RL respectively;

[0045] S6: When RH=RL=∞, the system has no grounding. At this time, VH=VL=2000V;

[0046]

[0047] S8: When the system is single-ended grounded or the insulation resistance is reduced, the following equation is obtained:

[0048]

[0049] The single-ended grounding resistance RH1 or RL1 can be obtained through this equation.

[0050] Please refer to Figure 4 , in an embodiment of the present application, the formula...

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Abstract

The invention discloses a method for calculating and eliminating high-voltage insulation resistance measurement sampling circuit errors. The method comprises the steps that S2, two grounded divider resistors RT with the same resistance are set inside an insulation monitor mainframe; S4, bus grounded voltage VH and VL is obtained through the ground divider resistors, and the two ground divider resistors are represented through RH and RL; S6, when RH=RL=infinity, VH=VL=2,000 V; S8, when the system single-end ground or insulation resistance is lowered, an equation specified in the description isobtained. Due to the equation, the single-end ground resistance RH1 or RL1 can be obtained. For solving the problem that an existing detection technology error is large, a software algorithm based onthe electric conduction method is put forwards, the algorithm is simplified, the influence of the sampling resistor Rt for the measuring precision is considered, and the measuring precision is improved. The system insulation drop caused by positive and negative electrode ground voltage is prevented from being directly measured, and the requirement for the voltage sensor voltage level is lowered.

Description

technical field [0001] The invention relates to a method for calculating and eliminating the error of a sampling circuit for measuring high-voltage insulation resistance, in particular to a software algorithm for eliminating the error of a sampling circuit for measuring high-voltage insulation resistance above 2kV. Background technique [0002] Because to ensure the accuracy of high-voltage insulation resistance measurement above 2kV, the software algorithm needs to have sufficient accuracy. In order to avoid being too complicated, the current software algorithm ignores the impact of the sampling resistor Rt on the measurement accuracy. Contents of the invention [0003] It is an object of the present application to overcome the above-mentioned problems or to at least partially solve or alleviate the above-mentioned problems. [0004] According to one aspect of the present application, a method for calculating and eliminating the error of the high-voltage insulation resis...

Claims

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Application Information

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IPC IPC(8): G01R27/02
CPCG01R27/025
Inventor 胡聪胡晓东陈凯捷陈晓波乐红兵
Owner 中国船舶重工集团公司第七〇三研究所无锡分部
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