CN201269903Y

CN201269903Y - Stray current detecting device

Info

Publication number: CN201269903Y
Application number: CNU2008201391799U
Authority: CN
Inventors: 高雄伟; 秦朝葵; 曾剑雷; 陈江
Original assignee: SHANGHAI PUDONG GAS CO Ltd
Current assignee: SHANGHAI PUDONG GAS CO Ltd
Priority date: 2008-10-15
Filing date: 2008-10-15
Publication date: 2009-07-08
Anticipated expiration: 2018-10-15

Abstract

The utility model discloses a stray current detection device which is mainly used for detecting the stray current of a buried steel pipeline. The working principle is as follows: the existing condition of stray current is detected through detecting the voltage to earth of the steel pipeline. The stray current detection device consists of a general-purpose PC, a data acquisition module, a data conversion module, a reference electrode, a power supply and a specialized application program. The detected voltage analog signal is collected by the data acquisition module so as to form a data signal; the data signal is inputted into the data conversion module so as to be converted into a RS232/485 signal which is inputted into the general-purpose PC and displayed and stored after being processed by the specialized application program arranged inside the general-purpose PC.

Description

The stray current pick-up unit

Technical field

The utility model is a kind of stray current pick-up unit, especially a kind of stray current pick-up unit of buried steel pipe.

Background technology

Stray current can produce grievous injury to the steel pipe that buries ground, and the stray electrical that surpasses certain intensity fails to be convened for lack of a quorum and causes frequent pitting corrosion.The generation and the variation of stray current are subjected to influence of various factors.The size of directly measuring stray current in the complex environment at the scene is very difficult, but always cause the variation of current potential when having electric current to flow through in soil and the pipeline, therefore often pass through to measure pipeline above earth potential forward migration value in the actual engineering, as the index of monitoring and evaluation stray current annoyance level.

Present stray current detects; all adopt the negative electrode connecting line mode of voltage table, contrast electrode, pipeline; the spontaneous potential of pipeline with respect to the earth---pipe-to-soil potential is determined by reading; when pipe-to-soil potential surpasses certain amplitude (100mV); the existence of stray current can be confirmed to have, and safeguard measure must be taked.

Present stray current pick-up unit because use mostly be voltage table, to some fast-changing undesired signals,, can not catch effectively as the stray current that track traffic produces.And the approved product that some producer provides, its sample frequency is high more, and cost is high more.The detection that these have all hindered stray current has to a certain extent influenced daily pipeline line walking work.

And like product in the market, price are very expensive, and sample frequency is 1Hz, and dirigibility can not be satisfied the needs of engineering.

The utility model content

In order to overcome above deficiency, the utility model purpose is, provides a kind of combination flexible, low price, and sample frequency is greater than the stray current pick-up unit more than the 6Hz.

Technical scheme

The purpose of this utility model can realize in the following manner

This stray current pick-up unit is made up of universal PC, data acquisition module, data conversion module, contrast electrode, power supply and specific program.Detected voltage analog signal forms digital signal by data collecting module collected, this digital signal is input to data conversion module and converts the RS232/485 signal to, be input to universal PC again, show, store after handling through the vertical application in the universal PC.

Characteristics such as portable copper sulphate contrast electrode has that voltage is stable, anti-polarization performance is good, long service life, internal resistance are little are suitable for on-the-spot the use.Can be used for measuring the spontaneous potential and the cathodic protection potential of underground metallic conduit, measure the stray current in the soil, also can be used for measuring the current potential of reinforcing bar in cable metal sheath and the concrete.

Test process: with metal bar soil is dialled a pitting, the contrast electrode bottom is imbedded in the hole, make it to contact well with soil, it is moistening that dry area can suitably add water.Contrast electrode copper core is as anode connection module passage positive pole, and tested buried pipeline is as negative electrode connection module passage negative pole, and wiring can pick out from buried pipeline, or adopts ground to reserve detective pole.

Beneficial effect

Compare with like product in the market, its advantage is:

1) combined and instant: the ADAMS type of modules is a lot, and the contrast electrode on every road only needs a pair of port; Can determine the ADAMS module number that needs according to the quantity of test point.

2) be convenient to visual background process: by various configuration softwares, can generate the various windows that need supervision easily, in time catch the situation of change of stray current.

3) cheap: in the whole technology, signal processing module is more expensive slightly than voltage table, but than the product of finalizing the design, cheap a lot.As: can detect the device of 4 contrast electrodes, need the ADAMS module of 1 eight passage, add a notebook computer, amount to 6000 yuan, sample frequency can reach 8Hz; And on the market, sample frequency is the approved product of 1Hz, and price is more than 10000 yuan.

Description of drawings

Fig. 1 is hardware system structure figure of the present utility model

Fig. 2 is a software flow pattern of the present utility model

Specific embodiments

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is hardware system structure figure of the present utility model, for conveniently moving, universal PC is selected common notebook computer for use, data acquisition module is selected ADAM4047 for use, data conversion module ADAM4520, contrast electrode is selected portable copper sulphate contrast electrode for use, and power supply is selected AC220V input/DC12V output Universal Switching Power Supply for use.

With metal bar soil is dialled a pitting, the contrast electrode bottom is imbedded in the hole, make it to contact well with soil, it is moistening that dry area can suitably add water, contrast electrode copper core connects data acquisition module passage positive pole as anode, tested buried pipeline connects data acquisition module passage negative pole as negative electrode, wiring can pick out from buried pipeline, or adopt ground to reserve detective pole, detected voltage analog signal forms digital signal by data collecting module collected, this digital signal is input to data conversion module and converts the RS232/485 signal to, is input to universal PC again, shows after handling through the vertical application in the universal PC, store.

Fig. 2 is a software flow pattern of the present utility model, this test macro uses LabVIEW software to programme, on notebook computer, install after the ADAM modules driver, can generate automatically in the software Function template and grind magnificent function and corresponding function node, these functional nodes can replace the node among the Data Acquisition that LabVIEW itself had fully, realize functions such as device control, data acquisition, can directly call, make things convenient for writing of program.

With the initialization system parameter, for example set test channel, selection communication serial ports, select module (can increase module), turn-on data to store control knob etc. when this stray current pick-up unit has just started for multiple channel test.Enter normal operating conditions subsequently, this stray current pick-up unit sample frequency can be regulated as required, the highlyest at present may reach 8Hz, data handling procedure is divided into 2 parts, that is: the data graphic shows, data storing in the data storing process mistake has taken place, program will reinitialize program, and then enter normal operating conditions.

Claims

1, a kind of stray current pick-up unit is characterized in that, this stray current pick-up unit is made up of universal PC, data acquisition module, data conversion module, contrast electrode, power supply and vertical application; Detected voltage analog signal forms digital signal by data collecting module collected, this digital signal is input to data conversion module and converts the RS232/485 signal to, be input to universal PC again, show, store after handling through the vertical application in the universal PC.

2, stray current pick-up unit according to claim 1 is characterized in that, described contrast electrode is portable copper sulphate contrast electrode.