CN102707191A - Diagnosis device and diagnosis method for corrosion of earth screen of large-size transformer substation - Google Patents
Diagnosis device and diagnosis method for corrosion of earth screen of large-size transformer substation Download PDFInfo
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- CN102707191A CN102707191A CN2012101215849A CN201210121584A CN102707191A CN 102707191 A CN102707191 A CN 102707191A CN 2012101215849 A CN2012101215849 A CN 2012101215849A CN 201210121584 A CN201210121584 A CN 201210121584A CN 102707191 A CN102707191 A CN 102707191A
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Abstract
The invention provides a diagnosis device for corrosion of an earth screen of a large-size transformer substation. The diagnosis device comprises a distribution type collection box, a signal collection device, a movable calculation PC (personal computer) and a 3G (3rd Generation) wireless communication terminal, wherein the distribution type collection box is formed by a box body, a protection cover, binding posts and a measuring lead wire, wherein the protection cover detachably covers the box body; a plurality of binding posts are vertical in a mutually-insulating manner and pass through a bottom plate of the box body; the measuring lead wire is a two-core flexible lead core; one end of the measuring lead wire is electrically with the lower ends of the binding posts; and the other end of the measuring lead wire is welded with a lead-up wire of a grid node of the earth screen. The diagnosis device and the diagnosis method for the corrosion of the earth screen of the large-size transformer substation can be widely applied to corrosion fault detection of the earth screen of the transformer substation which is put into operation and are particularly suitable for the large-size transformer substation which has a larger occupied area and higher safety requirements. Furthermore, the diagnosis device and the diagnosis method for the corrosion of the earth screen of the large-size transformer substation can also be widely applied to other systems with the earth screens, such as steel, chemical engineering, a power plant and the like and have extremely great required amount and an extremely wide application prospect.
Description
Technical field
The present invention relates to earth mat corrosion diagnostic device, especially relate to a kind of portable earth mat corrosion diagnostic device that can detect the bigger substation ground network of floor area.The invention still further relates to the diagnostic method that uses said diagnostic device.
Background technology
In transformer station, concentrate a large amount of important electrical equipments, needed good earthing device, satisfied the requirement of working earthing, protective ground and lightning protection.The practical earthing device of engineering is a grounded screen, and it is mainly the grid that is welded to form by band steel, round steel or angle steel etc.Personnel and device security in the performance quality direct relation of grounding net of transformer substation arrives at a station.Along with China's power system development, earth short circuit current also increases gradually, and is also increasingly high to the grounded screen performance demands.External grounded screen conductor adopts copper product mostly; The problem that the corrosion fault occurs is less, and China starts from resource, economic consideration, and the grounded screen conductor is processed by plain carbon steel mostly; The corrosion fault can appear after being embedded in underground operation for many years; Particularly be acid area at some coastal soil, etching problem is even more serious, is prone to cause grounded screen the open circuit on electric to occur.Simultaneously, in conjunction with the ground net corrosion property excavation inspection situation of stipulating among the electric power rower DL596-1996, in the grounded screen work progress, construction problems such as conductor, rosin joint leakage weldering often appear also using inferior materials and turning out substandard goods, lacking.Earth mat conductor corrosion, and the careless omission that occurs of construction link are prone to all cause that the ground connection parameter changes transformer station in, step voltage, contact electricity defective in the station for example, interior personal security of threat site and equipment stable operation.
Grounded screen is in non-maintaining state basically as disguised engineering after putting into operation.Electric power rower DL596-1996 marks Q/CSG 1 0007-2004 " power equipment preventive trial rules " with south net enterprise and has stressed the earth mat corrosion judges with the excavation of (more than 10 years) reconnaissance regularly to check to be main; Have stronger subjectivity and blindness; Take a part for the whole easily, be difficult to grasp the whole corrosion condition of earth mat.At present some new diagnostic method systems also occurred,,, the mathematical tool analysis has been carried out in detected response (voltage or magnetic field etc.) obtained the earth mat failure condition through injecting earth mat node certain range of excitation according to the earth mat topological structure.It like application number " substation grounding net defect diagnostic method and device " patent of 200710185685.1; It measures the distribution of magnetic induction density on the face of land through injecting pumping signal, and the normal condition data that then measurement result and simulation calculation gone out compare judges that ground net corrosion attenuates or the particular location and the degree of the defective that ruptures.The main deficiency of this patent is: because the electromagnetic environment in the transformer substation switch field is very complicated, the magnetic induction density of detection disturbs bigger, and filter design is very complicated, and accuracy is difficult to improve.Application number is " a kind of measurement mechanism of diagnosing the grounded screen connection status " patent of 201010586932.0 for another example, comprises metering circuit, central control and treatment circuit and PC etc.This device is carrier with the ground rod, to its input signal, through to the subsequent treatment of obtaining output response signal to obtain the local link information of grounded screen.The main deficiency of this patent is: large-scale substation earth mat floor area is often bigger; When measuring, field diagnostic need extremely long measuring lead wire to spur and change measurement point continually back and forth; Once wiring can only be measured one group of port; Not only workload is bigger, and carries out long-time measuring operation at the charging zone switch yard of transformer station and can have serious potential safety hazard.
Summary of the invention
First technical matters to be solved by this invention; Just provide a kind of substation ground network corrosion diagnostic device to large-scale even ultra-large type grounded screen; It is removable to carry real-time networking, and simple and safe operation, does not need the extensive excavation can accurate detection failure defective.
Second technical matters to be solved by this invention is to corrode method of diagnosing with said apparatus to large-scale even substation ground network ultra-large type grounded screen with regard to providing a kind of.
The present invention solves the technical scheme that first technical matters adopts:
A kind of large-scale substation earth mat corrosion diagnostic device is characterized in that: comprise distributed capture box, signal pickup assembly, mobile computing PC and 3G wireless communication terminal;
Described distributed capture box is made up of box body, protective cover, binding post and measuring lead wire; Protective cover detachably covers on box body; The base plate of box body is erect and is passed on a plurality of binding post mutually insulateds ground; Measuring lead wire is two core flexible circuit conductors, the one of which end is electrically connected with the binding post lower end, the grid node of the other end and described earth mat draw the welding of reaching the standard grade.
Described distributed cable concentrator box body is the disk shell, the thick 8mm ~ 18mm of shell, and height is 80mm ~ 180mm, and diameter is 250mm ~ 600mm, and box stature material adopts the ABS resin material to process; Described protective cover is a hemispherical Shell, and diameter is consistent with described box body, and shell is thick to be 8mm ~ 18mm.When described distributed cable concentrator does not use, cover on the described box body and shield, when using described distributed cable concentrator it is taken off.Described binding post is commercial original paper, and panel waist hole is φ 7.0mm ~ 11mm, and withstand current is 10 ~ 30A, and testing withstand voltage is 3KV, inlays on the panel that is installed in described box body.
Described binding post top is positioned at outside the described box body; In the afterbody built-in box panel and connect a core in the measuring lead wire upper end; Represent to link to each other with label C with described electric current line; Represent to link to each other with label P with described pressure-wire; Every pair of described binding post (P, C post) connects a described measuring lead wire upper end, the lower end of corresponding described measuring lead wire be connected in a earth mat in the earth mat piecemeal that this described distributed cable concentrator distributes can reach node draw reach the standard grade on, according to connect and can reach node serial number this described binding post is marked.
Described signal pickup assembly is commercial microhmmeter, and it is made up of range network, Kelvin bridge, A/D modular converter (AD574D), open-circuit-protection module, serial communication interface, print module; Described serial communication interface is based on the data-interface of international EIA-RS-232C standard; Its message transmission rate adopts the baud rate of 4800KB; For data (information code): the level of logical one (mark) is lower than-3V, and the level of logical zero (spacing) is higher than+3V; For control signal; On-state (ON) is that the effective level of signal is higher than+3V; Off-state (OFF) is that the level of invalidating signal is lower than-3V; Just when the absolute value of transmission level during greater than 3V; Circuit can check out effectively, between-3～+ voltage between the 3V is meaningless, be lower than-15V or be higher than+voltage of 15V also thinks meaningless.Corresponding PC control routine S ﹙ s ﹚ is that single transmission order is that RS-232 interface only sends one group of data, and control routine C ﹙ c ﹚ sends data command continuously.Described Kelvin bridge is to be formed by the manganese-copper filament wire-wound of resistance original paper by technical maturity.
Described mobile computing PC is commercial notebook computer; Described 3G wireless communication terminal is commercial card of surfing Internet;
Described notebook computer internal memory is more than or equal to 2GB, and processor is greater than or equal to 1.5GHz, adopts Windows7 64 bit manipulation systems, and hard disk is greater than 500GB, and video card adopts integrated graphics card 64MB video memory or more.
Described mobile computing PC is commercial notebook computer, and calculator memory adopts 2GB or more, and processor is 1.5GHz or higher, adopts Windows7 64 bit manipulation systems, and hard disk is greater than 500GB, and video card adopts integrated graphics card 64MB video memory or more.Jumbo hard disk and high-end internal memory are enough to guarantee the storage and the analytical work of the competent data of computing machine.All controling can realize through Trackpad and keyboard, can do to keep watch in real time to equipment operation through LCD, and obtain required various information.
Described 3G wireless communication terminal is a card of surfing Internet, based on the 3G card of surfing Internet of the CDMA2000 1X of China Telecom network, the TD-SCDMA/HSUPA of China Mobile network or the HSDPA/UMTS/HSUPA of UNICOM network.Described 3G wireless communication terminal transfer rate is descending greater than 3.1Mbps, and is up greater than 1.8Mbps.Interface type is USB 2.0.
A kind of large-scale substation earth mat corrosion diagnostic method that adopts above-mentioned diagnostic device may further comprise the steps:
S1 carries out piecemeal to large-scale grounding network, promptly is divided into different measured zone, and each measured zone comprises some nodes;
Each node of S2 is established one and is drawn and reach the standard grade, and one is drawn welding one measuring lead wire of reaching the standard grade, and weld is smeared corrosion resistant coating and carried out anti-corrosion protection, and measuring lead wire is commercial two core flexible circuit conductors, every core flexible circuit conductor nominal section 1.2 mm
2~ 2.8mm
2, two core flexible circuit conductors are respectively as electric current line and pressure-wire; (all nodes all have to draw and reach the standard grade, all draw to reach the standard grade all be welded with measuring lead wire)
The S3 measuring lead wire is drawn the horizontal arrangement that 200mm ~ 300mm buried depth is adopted in the back; The last binding post that all converges at a distributed cable concentrator is measured for concentrating; Described binding post connects a core in the two core flexible circuit conductor measuring lead wire, representes to link to each other with described electric current line with label C, representes to link to each other with described pressure-wire with label P; Every pair of described binding post (P, C post) connects a described measuring lead wire, and distributed cable concentrator is placed in the ground network edge;
S4 carries out DATA REASONING with signal pickup assembly to any two pairs of posts on the described cable concentrator; Equivalent measurement the port of the corresponding earth mat node that connects of described measuring lead wire, promptly replaced on-the-spot backguy measuring mode in the switch yard zone of large-scale substation.
Described S4 is: measured resistance (earth mat port) inserts with four terminal methods in the both arms Kelvin bridge of microhmmeter of described signal pickup assembly; Encourage through described electric current line injection current, and record voltage so that calculate corresponding ports resistance by described pressure-wire.
This kind wiring metering system of the present invention can be transferred to conductor resistance and contact resistance in the electric power loop and go; Because the arm resistance of Kelvin bridge is more much bigger than corresponding additional resistance; Thereby can additional resistance be ignored, eliminate the influence of conductor resistance and contact resistance testing resistance.
Described range network is used to change the different measurement range of described Kelvin bridge, and measurement range satisfies 1m Ω ~ 2000m Ω, and resolution satisfies 1 μ Ω.Described signal pickup assembly draws line cap to after measuring to any a pair of earth mat, carries out the resistive voltage conversion, converts digital signal to through A/D again and can directly communicate by letter with mobile computer through the RS232 communication interface.
The described measuring lead wire that converges in the earth mat piecemeal that is all distributed that act as of described distributed cable concentrator is measured for concentrating.
Described distributed cable concentrator and described measuring lead wire are are all once installing and fixing, for repeatedly measure in the future.
Diagnosis principle
The grounded screen more complicated of actual transformer station is the input that makes things convenient for data and the foundation of math equation, and grounded screen is done following processing and hypothesis:
1. do not consider the natural grounding substance of grounded screen, like running water pipe, power distribution equipment framework basis is incorporated into the metal sheath of overhead ground wire, cable bearer and cable on the power distribution equipment framework etc.
2. the ground lead of hypothesis measurement and the tie point of grounded screen all are on the node of grounded screen horizontal branches;
According to circuit theory:
（2.4）
By incidence matrix
AThe KCL and the KVL equation of expression do
Thereby obtain port resistance
R Ij :
Can know by circuit theory, to any N end network, if the structure of ability known network and the resistance of branch road, and the excitation situation, so,, just can obtain port resistance according to nodal analysis.But for fault diagnosis, be by
R Ij Ask the resistance of the branch road of grounded screen
R k , can find out that it is the inverse problem that circuit calculates.
2. the foundation of diagnosis equation
Grounded screen illustraton of model before will corroding above is regarded as one to have
bArticle+1, branch road,
nThe network N of+1 node.Wherein,
bArticle+1, branch road is connected grounded screen
i,
jEnd.On this grounded screen
i,
jPort adds a current source, and its current value does
I 0, can obtain according to circuit theory
R Ij
Illustraton of model after grounded screen is corroded be regarded as network N ', still at it
i,
jEnd adds current source, and current value does
I 0Obtain
R'
Ij Can know that network N is identical with network N ' topological structure.
Work as arm of a network
kWhen corrosion or fracture take place, its branch road resistance
R k Become
R'
k , that is:
This moment network port resistance
R Ij Become
R'
Ij , that is:
（2）
According to Tellegen:
（3）
Because two networks
i,
jThe of end
bArticle+1, the electric current of branch road all does
I 0, that is:
（6）
（7）
Substitution formula (3) and formula (4):
Formula (8) deducts formula (9):
（10）
Formula (1) and formula (2) substitution formula (10):
So just obtained the relation of port increased resistance value and branch road increased resistance value, but can't directly obtain the branch road increased resistance value, because the variable number of branch road resistance has by the port increased resistance value
bIndividual, so thereby needing to measure a series of port resistance draws a set of equations:
（13）
Wherein,
mBe the port number of measuring,
I k Can by
R k Obtain.
And
I'
k By
R'
k Decision, but
R'
k The unknown is so this moment, equation still can not solve.
From formula (13), can find out that system of equations belongs to nonlinear equation, can't directly find the solution.
For dealing with problems, introduce alternative manner.At first, order
I'
k (0)=
I k , system of equations becomes system of linear equations, but
m＜
bIt is fixed that system of equations is owed, and needs to find the solution with optimization method, and what use among this paper is quasi-Newton method.So just obtain △
R k (0) and
R'
k (0), then uses
R'
k (0) calculates
I'
k (1); Use then
I'
k (1) calculates
R'
k (1).Calculating above repeating meets the demands up to the resistance increment of obtaining, and gets result of calculation to the end.Obtaining corresponding diagnostic routine through software programming according to above theory.
But for big-and-middle-sized earth mat; The substation ground network floor area is bigger; The downlead that connects earth mat is also more, can't all measure, and can take earth mat piecemeal measurement scheme; Carry out computational analysis through test simulation through the suitable measurement point measurement data of choosing in the little piecemeal, the result who obtains has higher accuracy.
The invention has the beneficial effects as follows:
1. measure through directly measure large-scale substation earth mat node port electric parameters at described slotted line terminal; Substitute the charged transformer substation switch field of entering and carry out big span backguy measurement; Remove out numerous and diverse operating performances such as work ticket from; And duplicate measurements regularly is easy, workload is low, not only reduces the security risk of surveying work.
2. the large-scale substation occupation of land is bigger, and equipment layout is complicated, and the difficulty of accurately fixing a point is higher.Can carry out piecemeal to large-scale earth mat easily through described distributed cable concentrator, directly measure the accuracy that can improve measurement data, improve efficiency of measurement greatly at described distributed cable concentrator.
3. the present invention can find the corrosion fault of grounded screen and the development of fault in advance; The ground net corrosion fault is made location and safety assessment; Realized transformer station Non-Destructive Testing diagnosis, searched the method for grounded screen breakpoint and corrosion section with respect to traditional large-area power-cuts excavation, the pointed height of the method that this system provides, speed is fast and equipment is simply portable; The measurement data directly described data processing main frame of input is analyzed; Advantages such as the result who obtains can share immediately, output and storage, and do not influence the normal operation of electric system, thus guaranteed the safe operation and the power supply reliability of electric system; Naoki founds the good image of electric system in every profession and trade, and indirect economic effect that brings thus and social benefit are also very huge.
The earth mat that the present invention can be widely used in the transformer station of having put into operation corrodes fault detect, and it is bigger to be specially adapted to floor area, the large-scale substation that safety requirements is higher.In addition, this achievement in research also can be applicable to iron and steel, chemical industry and power plant etc., and other has the system of earth mat, and demand is very big, and application prospect is very wide.
Description of drawings
Fig. 1 is that diagnostic device of the present invention is formed the structural principle synoptic diagram;
Fig. 2 is the structural representation that removes the distributed cable concentrator of protective cover;
Fig. 3 is the outboard profile of the distributed cable concentrator of band protective cover;
Fig. 4 is the arrangenent diagram of distributed cable concentrator and earth mat to be measured.
Among the figure: 1 binding post, 2 box bodys, 3 measuring lead wire, the 4 electric current lines that link to each other with signal pickup assembly, 5 pressure-wires that link to each other with signal pickup assembly, 6 protective covers, 7 distributed cable concentrators, 8 large-scale earth mats to be measured.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Like Fig. 1 ~ shown in Figure 4 is large-scale substation earth mat corrosion diagnostic device embodiment of the present invention, and it mainly is made up of distributed capture box, signal pickup assembly, mobile computing PC and 3G wireless communication terminal.
See Fig. 2 and Fig. 3; Distributed cable concentrator is made up of box body, protective cover, binding post and measuring lead wire; Protective cover detachably covers on box body; The base plate of box body is erect and is passed on a plurality of binding post mutually insulateds ground, and measuring lead wire is two core flexible circuit conductors, the one of which end is electrically connected with the binding post lower end, the grid node of the other end and earth mat draw the welding of reaching the standard grade.
Distributed cable concentrator box body is the disk shell, the thick 8mm ~ 18mm of shell, and height is 80mm ~ 180mm, and diameter is 250mm ~ 600mm, and box stature material adopts the ABS resin material to process, and protective cover is a hemispherical Shell, and diameter is consistent with box body, and shell is thick to be 8mm ~ 18mm.When distributed cable concentrator does not use, cover on the box body and shield, during use it is taken off, binding post is commercial original paper, and panel waist hole is φ 7.0mm ~ 11mm, and withstand current is 10 ~ 30A, and testing withstand voltage is 3KV, inlays on the panel that is installed in described box body.
The binding post top is positioned at outside the box body; In the afterbody built-in box panel and connect a core in the measuring lead wire upper end; Represent to link to each other with the electric current line with label C, represent to link to each other with pressure-wire with label P, every pairs of posts (P, C post) connects a measuring lead wire; Corresponding measuring lead wire lower end be connected in a earth mat in the earth mat piecemeal that this distributed cable concentrator distributes can reach node draw reach the standard grade on, according to connect and can reach node serial number this described binding post is marked.
Large-scale grounding network is carried out piecemeal, promptly be divided into different measured zone, described distributed cable concentrator of each region allocation, distributed cable concentrator are placed in the ground network edge.
Measuring lead wire is commercial two core flexible circuit conductors, and every core flexible circuit conductor nominal section 1.2mm2, every core flexible circuit conductor are welded on drawing of linking to each other with horizontal earth mat node reach the standard grade as electric current line and pressure-wire respectively, and weld is smeared corrosion resistant coating and carried out anti-corrosion protection.Measuring lead wire only connects one and draws and reach the standard grade, and draws the horizontal arrangement that the 200mm buried depth is adopted in the back from pad, all converges at box body at last.
The measuring lead wire that converges in the earth mat piecemeal that is all distributed that act as of distributed cable concentrator is measured for concentrating.Through DATA REASONING to any two pairs of posts on the cable concentrator, equivalent measurement the port of the corresponding earth mat node that connects of measuring lead wire, promptly replaced on-the-spot backguy measuring mode in the switch yard zone of large-scale substation.
Distributed cable concentrator and described measuring lead wire are are all once installing and fixing, for repeatedly measure in the future.
Signal pickup assembly is the CT3010 tester of the high electric company of commercial dc resistance meter such as Hangzhou, and it is made up of Kelvin bridge, A/D modular converter (AD574D), open-circuit-protection module, serial communication interface, range network, print module.Serial communication interface is based on the data-interface of international EIA-RS-232C standard; Its message transmission rate adopts the baud rate of 4800KB; For data (information code): the level of logical one (mark) is lower than-3V, and the level of logical zero (spacing) is higher than+3V; For control signal; On-state (ON) is that the effective level of signal is higher than+3V; Off-state (OFF) is that the level of invalidating signal is lower than-3V; Just when the absolute value of transmission level during greater than 3V; Circuit can check out effectively, between-3～+ voltage between the 3V is meaningless, be lower than-15V or be higher than+voltage of 15V also thinks meaningless.Corresponding PC control routine S ﹙ s ﹚ is that single transmission order is that RS-232 interface only sends one group of data, and control routine C ﹙ c ﹚ sends data command continuously.
Kelvin bridge is to be formed by the manganese-copper filament wire-wound of resistance original paper by technical maturity.Measured resistance (earth mat port) inserts in the double bridge with four terminal methods, encourages through electric current line injection current, and records voltage so that calculate corresponding ports resistance by pressure-wire.This kind wiring metering system can be transferred to conductor resistance and contact resistance in the electric power loop and go, because arm resistance is more much bigger than corresponding additional resistance, thereby additional resistance is ignored, and has eliminated the influence to testing resistance of conductor resistance and contact resistance.
The range network is used to change the different measurement range of Kelvin bridge, and measurement range satisfies 1m Ω ~ 2000m Ω, and resolution satisfies 1 μ Ω.
Signal pickup assembly draws line cap to after measuring to any a pair of earth mat, carries out the resistive voltage conversion, converts digital signal to through A/D again and can directly communicate by letter with mobile computer through the RS232 communication interface.
Mobile computing PC is commercial notebook computer, and calculator memory adopts 2GB, and processor is i3-2330M 2.2GHz, adopts Windows7 64 bit manipulation systems, hard disk 500GB, and display chip AMD Radeon HD 6630M, its video memory capacity is 1GB.Jumbo hard disk and high-end internal memory are enough to guarantee the storage and the analytical work of the competent data of computing machine.All controling can realize through Trackpad and keyboard, can do to keep watch in real time to equipment operation through LCD, and obtain required various information.
The 3G wireless communication terminal is the EC122 3G of Huawei (HUAWEI) wireless Internet card, the descending 3.1Mbps of data transmission rate, and up 1.8Mbps, based on the CDMA2000 1X of China Telecom network, interface type is USB 2.0.
Adopt the diagnostic method embodiment step of above-mentioned large-scale substation earth mat corrosion diagnostic device following:
S1 is input to the topology data of actual earth mat among the mobile computing PC; Size and shape according to earth mat are selected the earth mat port data that measurement scheme is measured needs; Large-scale grounding network is carried out piecemeal, promptly be divided into different measured zone, each measured zone comprises some nodes;
Each node of S2 is established one and is drawn and reach the standard grade; One is drawn welding one measuring lead wire of reaching the standard grade, and weld is smeared corrosion resistant coating and carried out anti-corrosion protection, and measuring lead wire is commercial two core flexible circuit conductors; Every core flexible circuit conductor nominal section 1.2 mm2 ~ 2.8mm2, two core flexible circuit conductors are respectively as electric current line and pressure-wire; (all nodes all have to draw and reach the standard grade, all draw to reach the standard grade all be welded with measuring lead wire)
The S3 measuring lead wire is drawn the horizontal arrangement that 200mm ~ 300mm buried depth is adopted in the back; The last binding post that all converges at a distributed cable concentrator is measured for concentrating; Described binding post connects a core in the two core flexible circuit conductor measuring lead wire, representes to link to each other with described electric current line with label C, representes to link to each other with described pressure-wire with label P; Every pair of described binding post (P, C post) connects a described measuring lead wire, and distributed cable concentrator is placed in the ground network edge;
S4 carries out DATA REASONING with signal pickup assembly to any two pairs of posts on the described cable concentrator; Equivalent measurement the port of the corresponding earth mat node that connects of described measuring lead wire, promptly replaced on-the-spot backguy measuring mode in the switch yard zone of large-scale substation; Be specially:
In the both arms Kelvin bridge of measured resistance (earth mat port) with the microhmmeter of four terminal methods access signal pickup assembly; The electric current line 4 that described signal pickup assembly is linked to each other is connected on the pairs of posts 1 on the distributed cable concentrator 7 with pressure-wire 5; The DC current that applies 5A encourages measures the right port resistance of corresponding earth mat node, and the resistance parameter signal that records is transferred among the mobile computing PC through the RS-232 communication interface in signal measurement and harvester 5.And image data on different distributed cable concentrators 7 successively;
Draw the corrosion failure condition through computational analysis after the Survey Software combined data, location corrosion fault branch, and can carry out the information transmission through described 3G wireless communication terminal and higher level's department system, or the corresponding diagnostic result of printout.
Be that the The whole calculations process steps is following below
1) obtains the topological structure and the branch road resistance
of grounded screen from design drawing; Calculate
according to circuit theory, choose some measured node groups and obtain resistance between theoretical node
(s=1～m);
2) measurement port resistance
calculates port increased resistance value
;
3) make
;
4) combine optimization method to calculate
(t=0 with system of equations (10); 1; ..., t is an iterations); Calculate
then;
5) if
and
; Stop iterative computation so; Think
and be end product,
be the constant of setting; Otherwise continue next step;
6?) With
calculate
; Repeat Step 4.
Because the number of unknown quantity is b in the system of equations (10); Obtain the exact value of these variablees, the number of equation number should be b, but the numerical value of b is very big; Because the quantity of general substation grounding lead-in wire is less than the branch road quantity of grounded screen, it is impossible on engineering, will to accomplish these measurements repeatedly.In order to obtain exact value preferably, need use optimization technique:
(14)
s.t.?
?(k?=1，2，...，b)
Draw the corrosion failure condition through the Survey Software computational analysis, location corrosion fault branch, and output and inventory analysis result are for further research and maintenance.
Claims (4)
1. a large-scale substation earth mat corrosion diagnostic device is characterized in that: comprise distributed capture box, signal pickup assembly, mobile computing PC and 3G wireless communication terminal;
Described distributed capture box is made up of box body, protective cover, binding post and measuring lead wire; Protective cover detachably covers on box body; The base plate of box body is erect and is passed on a plurality of binding post mutually insulateds ground; Measuring lead wire is two core flexible circuit conductors, the one of which end is electrically connected with the binding post lower end, the grid node of the other end and described earth mat draw the welding of reaching the standard grade.
2. large-scale substation earth mat corrosion diagnostic device according to claim 1, it is characterized in that: described distributed cable concentrator box body is the disk shell, box stature material adopts the ABS resin material to process; Described protective cover is a hemispherical Shell, and diameter is consistent with described box body; Described binding post is commercial original paper, and panel waist hole is φ 7.0mm ~ 11mm, and withstand current is 10 ~ 30A; Testing withstand voltage is 3KV; Described binding post top is positioned at outside the described box body, and afterbody built-in box panel is interior and connect a core in the measuring lead wire upper end, representes to link to each other with described electric current line with label C; Represent to link to each other with label P with described pressure-wire; Every pair of described binding post connects a described measuring lead wire, corresponding described measuring lead wire lower end be connected in a earth mat in the earth mat piecemeal that this described distributed cable concentrator distributes can reach node draw reach the standard grade on, according to connect and can reach node serial number this described binding post is marked; Described signal pickup assembly is commercial microhmmeter, and it is made up of range network, Kelvin bridge, A/D modular converter (AD574D), open-circuit-protection module, serial communication interface, print module; Described serial communication interface is based on the data-interface of international EIA-RS-232C standard, and its message transmission rate adopts the baud rate of 4800KB, and described Kelvin bridge is to be formed by the manganese-copper filament wire-wound of resistance original paper by technical maturity; Described mobile computing PC is commercial notebook computer; Described 3G wireless communication terminal is commercial card of surfing Internet; Described notebook computer internal memory is more than or equal to 2GB, and processor is greater than or equal to 1.5GHz, adopts Windows7 64 bit manipulation systems, and hard disk is greater than 500GB, and video card adopts integrated graphics card 64MB video memory or more.
3. the large-scale substation earth mat of employing earth mat corrosion diagnostic device according to claim 1 or claim 2 corrodes diagnostic method, may further comprise the steps:
S1 carries out piecemeal to large-scale grounding network, is divided into different measured zone, and each measured zone comprises some nodes;
Each node of S2 is established one and is drawn and reach the standard grade, and one is drawn welding one measuring lead wire of reaching the standard grade, and weld is smeared corrosion resistant coating and carried out anti-corrosion protection, and measuring lead wire is commercial two core flexible circuit conductors, every core flexible circuit conductor nominal section 1.2 mm
2~ 2.8mm
2, two core flexible circuit conductors are respectively as electric current line and pressure-wire;
The S3 measuring lead wire is drawn the horizontal arrangement that 200mm ~ 300mm buried depth is adopted in the back; The last binding post that all converges at a distributed cable concentrator is measured for concentrating; Described binding post connects a core in the two core flexible circuit conductor measuring lead wire, representes to link to each other with described electric current line with label C, representes to link to each other with described pressure-wire with label P; Every pair of described binding post connects a described measuring lead wire, and distributed cable concentrator is placed in the ground network edge;
S4 carries out DATA REASONING with signal pickup assembly to any two pairs of posts on the described cable concentrator; Equivalent measurement the port of the corresponding earth mat node that connects of described measuring lead wire, promptly replaced on-the-spot backguy measuring mode in the switch yard zone of large-scale substation.
4. large-scale substation earth mat corrosion diagnostic method according to claim 3; It is characterized in that: described step S4 is: measured resistance inserts with four terminal methods in the both arms Kelvin bridge of microhmmeter of described signal pickup assembly; Encourage through described electric current line injection current, and record voltage so that calculate corresponding ports resistance by described pressure-wire.
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