CN202453451U - Earth grid corrosion and broken point diagnosing system for large and medium-sized substations - Google Patents
Earth grid corrosion and broken point diagnosing system for large and medium-sized substations Download PDFInfo
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- CN202453451U CN202453451U CN2012200347193U CN201220034719U CN202453451U CN 202453451 U CN202453451 U CN 202453451U CN 2012200347193 U CN2012200347193 U CN 2012200347193U CN 201220034719 U CN201220034719 U CN 201220034719U CN 202453451 U CN202453451 U CN 202453451U
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Abstract
An earth grid corrosion and broken point diagnosing system for large and medium-sized substations comprises a mobile measurement port box, a port measurement device, a mobile mainframe computer and test clamps. The utility model provides a novel diagnosing system, by performing a first wring for partial points to be measured of a substation, all the combinations of any two of the wringed points to be measured can be measured at the mobile measurement port box, process of repeated wringing can be omitted, and measurement data measured by port measurement device is transmitted to the mobile mainframe computer through a high-speed serial port. The specific circumstance of defects of each earth grid branch can be acquired by analyzing the data by the aid of diagnosing software. The earth grid corrosion and broken point diagnosing system for the large and medium-sized substations can be widely used for detecting earth grid corrosion faults of the substations which are put into operation, and especially is applicable to large substations which occupy large area and have high requirements on safety. Besides, the earth grid corrosion and broken point diagnosing system further can be applied to other systems with grounding grids such as steel, chemical industry, power plants and the like.
Description
Technical field
The utility model relates to a kind of systems for diagnosing large and medium-sized substation ground network corrosion and breakpoint, and in particular to and it is a kind of that quickly and easily large and medium-sized grounding net of transformer substation is measured, and position the diagnostic system of corrosion and breakpoint fault.Belong to detection technique field.
Background technique
Ground connection refers to the electrical connection between certain nodes of electrical system or the certain current-carrying parts and the earth of electric utility, and Power Plant Substation ground connection is the unification of lightning protection, working earthing and protective grounding three.The material that the earth conductor of China's substation ground network uses is mainly ordinary carbon steel, generally uses band steel or round steel horizontal laying, is arranged in long pass or square groove embedment underground, area are slightly larger than the area of substation.After grounded screen puts into operation, place into the soil as time goes by grounded screen will receive different degrees of corrosion, in the weaker soil of corrosivity, the year degree of corrosion of earth mat metallic conductor has 1mm, in the strong soil of corrosivity reach 3mm.Because different degrees of corrosion can directly reduce the service life of grounded screen and influence the safe operation of power grid after grounded screen operation many years.The corrosion of carbon steel is usually local corrosion, and become fragile after corrosion, aliquation, corrosion location be tapered it is thinning, be even broken, cause ground connection performance not to be able to satisfy the requirement of thermal stability.Thus cause when ground fault occurs, earth short circuit current may cause local potential beyond specification.Even because counterattack or cable skin circulation destroy the insulation of secondary device, expansion accident simultaneously jeopardizes equipment and personal safety, to bring huge economic loss and bad social influence.
Since earth mat is embedded in underground throughout the year, previous grounded screen monitoring is all unqualified or after breaking down in discovery ground resistance, electrical connection fault point or the corrosion section of grounded screen are searched by excavating, and then determine whether to carry out whole station transformation, such mode extremely falls behind, it is not scientific, it is seen that corrosion or breakpoint conventional means for earth mat conductor are difficult to that manager is made easily and accurately to understand its status.Also occur some new diagnostic systems at present, the response detected is analyzed using mathematical tool to obtain earth mat fault condition by the certain excitation of injection earth mat node according to earth mat topological structure.Such as application No. is 200710185685.1 " substation grounding net defect diagnostic method and device " patents, it measures magnetic induction intensity in the distribution of earth's surface by injection pumping signal, is then compared to judge that ground net corrosion attenuates or be broken the specific location and degree of defect for the normal condition data that measurement result and simulation calculation go out.The main deficiency of the patent is: since the electromagnetic environment in transformer substation switch field is extremely complex, the magnetic induction intensity interference of detection is larger, and filter design is extremely complex, and accuracy is difficult to improve.For another example application No. is 201010586932.0 " a kind of measuring device for diagnosing connecting state of grounding network " patents, including measuring circuit, central processing control circuit and PC machine etc..The device is using grounding rod as carrier, to its input signal, by the local link information for obtaining grounded screen to the subsequent processing for obtaining output response signal.The main deficiency of the patent is: often large-scale substation earth mat occupied area is larger, the measurement lead that field diagnostic needs extremely to grow when measuring continually pulls and replaces back and forth measurement point, primary wiring can only measure one group of port, not only larger workload, but also carry out measuring to operate for a long time can have serious security risk in the charging zone switch yard of substation.
Summary of the invention
The purpose of this utility model be to existing corrosion diagnosis there are the problem of, provide it is a kind of it is fast and convenient for large and medium-sized substation grounding net operation, be not required to have a power failure and extensive excavate the diagnostic system that can accurately detect corrosion or breakpoint.
The utility model solves technical solution used by above-mentioned technical problem: a kind of system diagnosing large and medium-sized substation ground network corrosion and breakpoint, including traverse measurement port box, port measuring device, mobile computing machine host and testing clamp.
Wherein, one end is connect by measure traverse line with the measurement binding post on the box of traverse measurement port by the testing clamp drawn on online that jaw is clipped in earth mat node, and several tested points are come together in traverse measurement port box.
The port measuring device includes measurement module, data conversion module and communication module；The measurement module is connected on any pair of measurement binding post on the box of the traverse measurement port by measurement current line and measurement pressure-wire, pass through measurement current line Injection Current excitation, voltage value between two measurement binding posts is measured by measurement pressure-wire, then by the double bridge of measurement module obtain with this between the resistance value the corresponding any two tested point of measurement binding post；Mobile computing machine host is inputted by data conversion module and communication module, mobile computing machine host carries out analytical calculation to the data, and the variable quantity according to the resistance value relative to theoretical value diagnoses Grounding Grid and breakpoint.
The actual value of grounded screen branch resistance test data and the initial resistance value of grounded screen branch are analyzed using the diagnostic software worked out in computer in the mobile computing machine host.Analysis principle is as follows:
Assuming that grounded screen has n+1 node, b branch, m ground lead (i.e. earth mat node draw online) ignores the influence of edphic factor, grounded screen can be regarded as to a resistor network.Former network port resistance acquires: assuming that adding an I in the port i-th, j of the network0Current source.Definition: A is the incidence matrix of network after a selected reference mode；YbFor branch admittance matrix；YnFor node admittance matrix；IbFor branch current matrix；UnFor node voltage column vector；InFor the current source column vector of node (current value of non-actuated contact is 0).
According to circuit theory:
(1)
It is available:
To obtain port resistiveR ij :
By circuit theory it is found that any one N-terminal network, if the energy structure of known network and the resistance of branch, and excitation situation, then, according to modal analysis, so that it may find out port resistive.But for fault diagnosis, be byR ij Seek the resistance of the branch of grounded screenR k , it can be seen that it is the inverse problem of circuit counting.
Grounded screen illustraton of model before corrosion, which is considered as one, has b+1 branch, the network N of n+1 node.Wherein, the b+1 articles branch is connected to the i of grounded screen, the end j.The port i-th, j in the grounded screen adds a current source, current value I0, can be found out according to circuit theoryR ij ；Illustraton of model after grounded screen is corroded is considered as network
, still in its i, the end j adds current source, current value I0.It finds outR ij ′；Know network N and network N’Topological structure is identical, when corrosion or fracture occur for branch of a network K, the port resistive of network at this timeR ij BecomeR ij ', it may be assumed that
It is obtained according to Tellegen
(5)
It is obtained by (5)-(6):
To:
The relationship of port resistive changing value and branch resistance changing value is thus obtained, but branch resistance changing value directly can't be obtained by port resistive changing value, because the variable number of branch resistance there are b, a series of port resistive need to be measured to obtain one group of equation:
Wherein, m is the port number of measurement, IkIt can be by RkIt obtains.Ik' and by Rk' determine, but Rk' unknown, as can be seen from the above formula that equation group belongs to nonlinear equation, it can not direct solution.To solve the problems, such as, alternative manner is introduced.Firstly, enabling
, equation group becomes system of linear equations, but equation group m < b owes fixed, need to use Optimization Method, is that quasi-Newton method solves.Thus find out △ RkWith △ Rk', then use △ Rk' (0) calculates
；Then
It calculates
.Calculating above is repeated, until the resistance delta found out is met the requirements, calculated result to the end is obtained, to obtain the concrete condition of each branch defect of grounded screen.
After conductor corrodes, most intuitive performance is the variation of conductor cross-sectional area and branch resistance value, therefore with branch resistance value ratio before branch resistance increase after conductor equivalent diameter (ratio of current conductor diameter and original conductor diameter, be expressed as a percentage) and corrosion and corrosion as the index for measuring grounding grids fault degree.Fault degree is specifically divided and is shown in Table 1.
The division of 1 grounding grids fault degree of table
| Failure-description | Minor failure | Moderate failure | Catastrophe failure (including fracture) |
| The multiple that conductor resistance increases | 0< | 1< |  |
| Conductor equivalent diameter | 90%< | 10%< |  |
The beneficial effects of the utility model are:
1) composition of Tthe utility model system is simple, and by applying current excitation, measurement voltage signal calculates port resistive, strong antijamming capability, obtained signal stabilization.After being once routed to multiple measurement points, different measurement points pair can be rapidly measured obtaining port measuring device, has saved to measure different measurement points to the time for needing rewiring, has reduced security risk by reducing measurement work.Different size of port measuring device can be selected for the grounded screen of different area, use scope is wide.
2) the utility model has specific aim height and the simple portable mobile of equipment strong, and cooperation station interior power disk can measure immediately in substation, and measurement data directly inputs the advantages that mobile computing machine host is analyzed and stored.
3) the utility model can find the corrosion failure of grounded screen and the development of failure in advance, positioning and security evaluation are made to ground net corrosion failure, realize substation's non-destructive testing diagnosis, the method searched grounded screen breakpoint and corrode section is excavated relative to traditional large-area power-cuts, the normal operation of electric system is not influenced, to ensure that the safe operation and power supply reliability of electric system, good image of the electric system in every profession and trade is established, thus bring indirect economic effect and social benefit are also very huge.
The earth mat that the utility model can be widely used for having been put into the substation of operation carries out corrosion failure detection, safety requirements higher large-scale substation larger especially suitable for occupied area.In addition, applying also for other systems for having earth mat such as steel, chemical industry and power plant.
Detailed description of the invention
Fig. 1 is the utility model structure principle chart；
Fig. 2 is traverse measurement port box structure figure；
Fig. 3 is port measuring device functional block diagram；
In figure: 1- is embedded in the horizontal grounding net of underground；Drawing for 2- earth mat node is online；3- measure traverse line；4- traverse measurement port box；The port 5- measuring device；6- mobile computing machine host；7- testing clamp；9- circular hole；10- measures current line；11- measures pressure-wire；12- measures binding post.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
Embodiment 1
A kind of system diagnosing large and medium-sized substation ground network corrosion and breakpoint, is shown in Fig. 1, Fig. 2, Fig. 3, it mainly includes traverse measurement port box 4, port measuring device 5, mobile computing machine host 6, testing clamp 7.
The traverse measurement port box 4 is made of measure traverse line 3 and measurement binding post 12.The measure traverse line 3 is two core flexible circuit conductors of commercially available S strand type winding, every core flexible circuit conductor nominal section 1.5mm2, two core wires are connected on the testing clamp 7 in the measure traverse line 3.Testing clamp 7 one earth mat nodes of connection described in one draw online 2, and the measure traverse line 3 converges at the traverse measurement port box 4.The traverse measurement port box 4 is cuboid box, and box body material is made of engineering plastics, and certain external force can be born by having, and have good electrical isolation and dimensional stability, its excellent performance is still able to maintain under high and low temperature.Box thickness 3mm, a height of 60mm, a length of 90mm, width 90mm, each side of box body has 1 diameter 5mm circular hole 9 to pass through for the measure traverse line 3.The measurement binding post 12 is commercially available element, panel waist hole is φ 6.0mm, tolerance electric current is 10A, test pressure resistance is 3KV, it is embedded on the panel of the traverse measurement port box 4, quantity is equal with the circular hole 9 and position is close, and the circular hole 9 and the measurement binding post 12 respectively have 4 respectively, and each measure traverse line 3 described in the connection of binding post 12 one that measures is drawn by the nearest circular hole 9.It is located at outside traverse measurement port box 4 at the top of the measurement binding post 12, tail portion is embedded in box panel and connects a core in the measure traverse line 3, is marked with label C, it is used to connect measurement current line 10 when measurement；It is marked with label P, it is used to connect measurement pressure-wire 11 when measurement.Measure traverse line 3 described in every is pierced by by circular hole 9 described in one nearby, and the effect of the traverse measurement port box 4 is that measure traverse line 3 described in more of convergence concentrates multiple measurement for being once routed.By the DATA REASONING to any two pairs of posts on the traverse measurement port box 4, the port for the corresponding earth mat node that the equivalent measurement measure traverse line 3 connects.
For the testing clamp 7 by commercially available power detecting pincers, tong holder is the ABS material high pressure resistant, intensity is high, and jaw is the stamped molding of high-quality copper material, special Nickel Plating Treatment.Jaw is divided into two layers up and down, and makes its insulation, and electric current, voltage are separated.Jaw can be movable, and with face contact.Opening and length distinguish 30mm and 180mm, and test pressure resistance is greater than 3KV, and contact resistance is less than 1M Ω.
The port measuring device 5 is made of commercially available instrument for measuring DC resistance power module, measurement module, D/A converter module (AD574D), open-circuit-protection module, communication module.The power module is by alternating current 220V, 50Hz mains-supplied.The measurement module is the double bridge based on Kai Erwen connection principle, and resistance original part is by the copper-manganese silk thread of technical maturity around forming.Measured resistance (earth mat port) is to inject 2A current excitation by the measurement current line 10, and measure voltage by measurement pressure-wire 11 to calculate corresponding port resistive in four terminal methods access double bridge.Such wiring measurement method can be transferred to conductor resistance and contact resistance in electric power loop, since arm resistance is more much bigger than corresponding additional resistance, so that additional resistance be ignored, eliminate the influence of conductor resistance and contact resistance to testing resistance.The communication module uses RS-232 communication interface, and frame mode is data bit 8, stop position 1, and transmitting each group of data has 11 bytes, wherein 5 bytes of measurement data, 1 byte of decimal point, space 1 or 2 bytes, unit symbol 4 or 3 bytes.Corresponding PC control routine S is that single transmission order is that RS-232 interface only sends one group of data, and control routine C is to continuously transmit data command.After the measurement module measures binding post described in any pair, resistive voltage transformation is carried out, being converted into digital signal using the D/A converter module can directly be communicated with computer by RS-232 communication interface；It can also be communicated in a manner of wireless transmission with computer realization.Port measuring device 5 can use commercially available product, such as Shanghai Zhenyang ZY9858.
The mobile computing machine host 6 is commercially available mobile computer, 4GB DDR3 is saved as in computer, processor is Intel's Duo Processor i5-2450M, using Windows7 operating system, hard disk is 500GB, and the hard disk of large capacity and high-end memory are enough to ensure that computer is competent at the storage and analysis work of data.
A kind of corrosion of diagnosis large and medium-sized substation ground network and breakpoint system diagnosis method are as follows:
1. the topology data of practical earth mat is input in the mobile computing machine host 6, measurement scheme is selected according to the size of earth mat to measure the earth mat port data of needs.
2. entering transformer substation switch field, 4 measurement points are selected, the earth mat that the testing clamp 7 on measure traverse line described in 4 in the traverse measurement port box 4 is clipped in measurement point everywhere are drawn online.
3. the four terminal access methods based on double bridge, the measurement current line 10 being connected with port measuring device 5 and measurement pressure-wire 11 are connect in the pairs of posts 12 on traverse measurement port box 4, apply the DC current excitation of 2A to measure the port resistive of corresponding earth mat node pair, the resistance parameter signal measured by the RS-232 communications interface transmission in the port measuring device 5 into the mobile computing machine host 6.
4. being calculated after being input in analysis software according to following principle:
Equation group belongs to nonlinear equation in formula (10), introduces alternative manner.Firstly, enabling
, equation group becomes system of linear equations, butEquation group owes fixed, need to use Optimization Method, in this project is nonnegative least.Thus find out
With, then use
It calculates
；Then it uses
It calculates
.Calculating above is repeated, until the resistance delta found out is met the requirements, obtains calculated result to the end.
Here is the detailed step of entire calculating process:
1) topological structure and branch resistance of grounded screen are obtained from design drawing
；It is calculated according to circuit theory
, choose some measuring node groups and find out resistance between theoretical node(s=1~m)；
2) measurement port resistance, calculate port resistive changing value
；
3) it enables
；
4) it is calculated with equation group (10) in conjunction with optimization method(t=0,1 ..., t are the number of iterations)；Then it calculates
；
If 5)
And, then stopping iterative calculation, it is believed that
For final result,
For the constant of setting；Otherwise continue to the next step；
6) it uses
It calculates 
；Repeat step 4.
Because the number of unknown quantity is b in equation group (10), the exact value of these variables is obtained, 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 is less than the number of branches of grounded screen, to complete these multiple measurements in engineering can not.Preferable exact value in order to obtain needs to use Techniques of Optimum:
s.t. 
(k=1,2 ..., b)
Analysis is calculated by Survey Software and obtains corrosion failure situation, positions corrosion failure branch, and exports and store analysis result with for further study and maintenance.
Embodiment 2
A kind of system diagnosing large and medium-sized substation ground network corrosion and breakpoint, with embodiment 1, wherein every 2.5 mm of core flexible circuit conductor nominal section2, cable concentrator 8 thickness 7mm, a height of 100mm, a length of 150mm, width 150mm, measurement 12 panel waist hole of binding post is φ 8.0mm.Circular hole 9 and measurement binding post 12 respectively have 12 respectively, and respectively there are 3 circular holes 9 in each side of cable concentrator 8.It measures current line 10 and injects 5A current excitation.
Claims (2)
1. a kind of system for diagnosing large and medium-sized substation ground network corrosion and breakpoint, it is characterised in that: the system includes traverse measurement port box (4), port measuring device (5), mobile computing machine host (6) and testing clamp (7)；
Wherein, the testing clamp (7) that one end is clipped on drawing for earth mat node online (2) by jaw is connect by measure traverse line (3) with the measurement binding post (12) on traverse measurement port box (4), and several tested points are come together in traverse measurement port box (4)；
The port measuring device (5) includes measurement module, data conversion module and communication module；The measurement module is connected on any pair of measurement binding post (12) on traverse measurement port box (4) by measurement current line (10) and measurement pressure-wire (11), pass through measurement current line (10) Injection Current excitation, voltage value between two measurement binding posts (12) is measured by measurement pressure-wire (11), then by the double bridge of measurement module obtain with this between the resistance value the corresponding any two tested point of measurement binding post (12)；By data conversion module and communication module input mobile computing machine host (6), mobile computing machine host (6) carries out analytical calculation to the data, and the variable quantity according to the resistance value relative to theoretical value diagnoses Grounding Grid and breakpoint.
2. a kind of system for diagnosing large and medium-sized substation ground network corrosion and breakpoint according to claim 1, it is characterized by: measurement binding post (12) is made of the two piece-root grafting terminals labeled as C and P, wherein C connection measurement current line (10), P connection measure pressure-wire (11).
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| CN2012200347193U CN202453451U (en) | 2012-02-03 | 2012-02-03 | Earth grid corrosion and broken point diagnosing system for large and medium-sized substations |
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| CN103794025A (en) * | 2014-03-05 | 2014-05-14 | 张敬敏 | Intelligent buried mark pile early warning system and detecting method thereof |
| CN103792461A (en) * | 2013-11-21 | 2014-05-14 | 国家电网公司 | Grounding grid breakpoint diagnostic method for transient electromagnetic method |
| CN104678183A (en) * | 2015-03-23 | 2015-06-03 | 重庆大学 | Grounding grid branch circuit resistance detection method based on++-shaped detection unit |
| CN104698285A (en) * | 2015-03-23 | 2015-06-10 | 重庆大学 | Grounding grid branch resistance detecting method based on H-type detection unit |
| CN105445615A (en) * | 2015-11-12 | 2016-03-30 | 有能集团有限公司 | Corrosion diagnosis method for transformer station grounding network |
| CN105891604A (en) * | 2016-04-11 | 2016-08-24 | 国网安徽省电力公司电力科学研究院 | Loop impedance method of measuring power transmission support grounding impedance and testing system |
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| CN103792461A (en) * | 2013-11-21 | 2014-05-14 | 国家电网公司 | Grounding grid breakpoint diagnostic method for transient electromagnetic method |
| CN103792461B (en) * | 2013-11-21 | 2016-08-17 | 国家电网公司 | A kind of grounded screen breaking point diagnosis method of transient electromagnetic method |
| CN103794025A (en) * | 2014-03-05 | 2014-05-14 | 张敬敏 | Intelligent buried mark pile early warning system and detecting method thereof |
| CN103794025B (en) * | 2014-03-05 | 2016-11-30 | 张敬敏 | A kind of intelligent buried marker peg early warning system and detection method thereof |
| CN104698285B (en) * | 2015-03-23 | 2017-07-18 | 重庆大学 | A kind of grounded screen branch resistance detection method based on H type detection units |
| CN104678183A (en) * | 2015-03-23 | 2015-06-03 | 重庆大学 | Grounding grid branch circuit resistance detection method based on++-shaped detection unit |
| CN104698285A (en) * | 2015-03-23 | 2015-06-10 | 重庆大学 | Grounding grid branch resistance detecting method based on H-type detection unit |
| CN104678183B (en) * | 2015-03-23 | 2017-08-25 | 重庆大学 | A kind of grounded screen branch resistance detection method based on Lv type detection units |
| CN105445615A (en) * | 2015-11-12 | 2016-03-30 | 有能集团有限公司 | Corrosion diagnosis method for transformer station grounding network |
| CN105891604A (en) * | 2016-04-11 | 2016-08-24 | 国网安徽省电力公司电力科学研究院 | Loop impedance method of measuring power transmission support grounding impedance and testing system |
| CN105891604B (en) * | 2016-04-11 | 2019-05-31 | 国网安徽省电力公司电力科学研究院 | A kind of circuit impedance method and test macro measuring transmission tower impedance ground |
| CN109580463A (en) * | 2018-11-22 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | A method of measurement ground net corrosion degree |
| CN111830361A (en) * | 2019-04-18 | 2020-10-27 | 中国石油化工股份有限公司 | Oil field tank field grounding grid fault detection device |
| CN111830362A (en) * | 2019-04-18 | 2020-10-27 | 中国石油化工股份有限公司 | Non-excavation detection method suitable for grounding grid of oil field tank field |
| CN111830362B (en) * | 2019-04-18 | 2021-10-29 | 中国石油化工股份有限公司 | Non-excavation detection method suitable for grounding grid of oil field tank field |
| CN111830361B (en) * | 2019-04-18 | 2022-04-22 | 中国石油化工股份有限公司 | Method for detecting corrosion fault of grounding grid of oil field tank field |
| CN111855551A (en) * | 2020-08-04 | 2020-10-30 | 云南电力技术有限责任公司 | Evaluation method for corrosion state of grounding device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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