Real-time online measurement system and method for resistance of ground wire

A measurement system and resistance measurement technology, applied in the field of electronic communication, can solve problems such as the inability to measure single-point grounding points

Active Publication Date: 2013-06-19
CHINA RAILWAY SIGNAL & COMM SHANGHAI ENG BUREAU GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this kind of instrument is that it does not need auxiliary measurement ground, and the measurement process is simpl

Method used

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  • Real-time online measurement system and method for resistance of ground wire
  • Real-time online measurement system and method for resistance of ground wire
  • Real-time online measurement system and method for resistance of ground wire

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Experimental program
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Effect test

Embodiment 1

[0118] see figure 1 , the present invention discloses an on-line measurement system for ground wire resistance. A constant current I is injected through the auxiliary current pole, a sampling voltage V is taken out at the auxiliary voltage pole, and the insertion point of the auxiliary voltage pole on the ground is appropriately adjusted, so that the equipment ground Wire resistance R=V / I. At the same time, the ground wire resistance online measurement system also provides a communication interface to connect with the remote monitoring terminal, through which the remote monitoring terminal can intelligently manage the grounding status of equipment and buildings.

[0119] see figure 2 , the ground wire resistance online measurement system of the present invention includes a ground wire resistance online measurement device and a remote monitoring terminal 9; the ground wire resistance online measurement device includes an interference source processing module 1, a communicatio...

Embodiment 2

[0202] The difference between this embodiment and Embodiment 1 is that in this embodiment, in the real-time on-line measurement system for ground wire resistance, the software function modules of the microcontroller are composed as follows Figure 6 shown; below Figure 6 Each module in is described.

[0203] 1) Constant current source switch control

[0204] This module is mainly responsible for controlling whether to input a constant current source, and the constant current source of this device is 20mA.

[0205] 2) Measure the constant current source

[0206] This module is responsible for the Figure 4-7 The V1 point reads the constant current source, and also provides self-calibration of the constant current source before the device leaves the factory.

[0207] 3) Measuring sources of interference

[0208] This module judges whether the interference source is too large under the condition of injecting constant current source and not injecting constant current source....

Embodiment 3

[0224] The difference between this embodiment and Embodiment 1 is that in this embodiment, an alarm threshold for ground wire resistance can be set, and the measuring device will alarm if the ground wire resistance exceeds the threshold.

[0225] see Figure 8 , C (H) is the current electrode interface, P(S) is the auxiliary voltage electrode interface, and E is the ground wire interface; when actually measuring the ground wire resistance, C (H) It is connected to the ground rod of the injection electrode, P(S) is connected to the ground rod of the sampling voltage, and E is directly connected to the ground wire of the equipment or building. The measuring device provides an RS485 connection with the ground wire resistance monitoring terminal. Running the monitoring software on the ground wire resistance monitoring terminal can realize online real-time online monitoring and historical query functions, such as dynamic display, alarm indication, historical data reading, viewing...

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Abstract

The invention discloses a real-time online measurement system and a real-time online measurement method for the resistance of a ground wire. The measurement system comprises a microprocessor module, an interference source processing module, a communication module, a ground wire resistance measurement software module, a power management module, a constant current source injection module, a sampling voltage reading module and an interference source acquisition module, wherein the sampling voltage reading module measures sampling voltage under the control of the microprocessor module; and the ground wire resistance measurement software module calculates the resistance of the ground wire according to the sampling voltage measured by the sampling voltage reading module under the control of the microprocessor module. The resistance of the ground wire at a single point or a plurality of points can be measured on line in real time, the system is arranged at one time, and is time-saving and labor-saving, and high accuracy is maintained; the resistance of an auxiliary current electrode and the voltage of an interference source can be measured, the system and the method also have a real-time online function, data can be transmitted to a monitoring center for monitoring, and an alarm can be given according to settings; and in addition, the system and the method have a function of diagnosing the disconnection of an external connecting wire.

Description

technical field [0001] The invention belongs to the technical field of electronic communication, and relates to a ground wire resistance measurement system, in particular to a real-time on-line measurement system of the ground wire resistance; meanwhile, the invention also relates to a real-time on-line measurement method of the ground wire resistance. Background technique [0002] Grounding buildings and electronic equipment is very important. The building is well grounded, which can protect the people and objects in the building to a large extent; if the electronic equipment in the building is also well grounded, the potential difference between the electronic equipment casing and the ground can be reduced. When the potential difference is small, There may be no induced voltage, thus no displacement current, and the electronic devices inside the electronic equipment will not be broken down due to lightning discharge, thus protecting the electronic equipment. [0003] Whet...

Claims

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Application Information

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IPC IPC(8): G01R27/18
Inventor 王予平张长生徐连海潘云洪陆挺吴旺生陈志雄
Owner CHINA RAILWAY SIGNAL & COMM SHANGHAI ENG BUREAU GRP
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