Ground resistance online measuring instrument

A grounding resistance, measuring instrument technology, applied in the field of measurement, can solve problems such as poor accuracy and stability, limited use and development, and low measurement accuracy

Inactive Publication Date: 2015-03-25
牛誉博
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Problems solved by technology

[0003] At present, the ground resistance measuring instruments in the domestic market can be selected from the traditional rocker type or imitation rocker type digital resistance meter, single jaw resistance meter, Double-jaw digital resistance meter; but most of the measuring instruments have not very high measurement accuracy, which is 1 to 10 milliohms, and the accuracy and stability are not very good. When used in large substations and power plants (the grounding resistance value is less than 0.25 ohms), often not suitable, so large power plants and power stations mostly use foreign imported instruments, but their high price limits the use and development

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Embodiment Construction

[0012] As shown in the figure, the present invention includes a single-chip microcomputer, a display, a keyboard, a hardware control and protection part, a current collection part, a voltage collection part, a voltage analog signal processing part, and a current analog signal processing part. The protection part, the current collection part and the voltage collection part are connected, the current collection part is connected with the current analog signal processing part, and the voltage collection part is connected with the voltage analog signal processing part.

[0013] The single-chip microcomputer adopts MSP430F149 chip.

[0014] Described display adopts LCD display.

[0015] MSP430 MCU has abundant ports, P0, P1, P2 ports also have interrupt function. Peripheral modules are divided into man-machine interface modules, hardware protection modules, signal conditioning and data acquisition modules, etc.; man-machine interface modules include various functions and a...

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Abstract

The invention belongs to the technical field of measuring, especially relates to a ground resistance online measuring instrument, and discloses a ground resistance online measuring instrument advantaged in high measuring precision. The ground resistance online measuring instrument comprises a single-chip microcomputer, a display, a keyboard, a hardware control and protection part, a current acquisition part, a voltage acquisition part, a voltage analog signal processing part and a current analog signal processing part, and is mainly structurally characterized in that the single-chip microcomputer is respectively connected with the display, the keyboard, the hardware control and protection part, the current acquisition part and the voltage acquisition part, the current acquisition part is connected with the current analog signal processing part, and the voltage acquisition part is connected with the voltage analog signal processing part.

Description

technical field [0001] The invention belongs to the technical field of measurement, in particular to an online grounding resistance measuring instrument. Background technique [0002] The grounding system of power plants, substations, etc. is an important measure to maintain the safe and reliable operation of the power system and ensure the safety of electrical equipment and operators; the grounding grid and electrodes will have different changes every year due to corrosion, so the grounding resistance value of the grounding grid must be Regularly test to see if it exceeds the normal range; due to the large range of ground resistance values ​​and different sites, reasonable selection of measuring instruments is the guarantee of accurate measurement. [0003] At present, the grounding resistance measuring instruments in the domestic market can be selected from the traditional shaker or imitation shaker digital resistance meters, single-jaw resistance meters, and double-jaw di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/20
Inventor 牛誉博臧涵畅田佳
Owner 牛誉博
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