CN104931408A - Method for diagnosing substation grounding-grid corrosion and endpoints - Google Patents
Method for diagnosing substation grounding-grid corrosion and endpoints Download PDFInfo
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- CN104931408A CN104931408A CN201510371259.1A CN201510371259A CN104931408A CN 104931408 A CN104931408 A CN 104931408A CN 201510371259 A CN201510371259 A CN 201510371259A CN 104931408 A CN104931408 A CN 104931408A
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Abstract
The invention relates to a method for diagnosing substation grounding-grid corrosion and endpoints. The method includes: acquiring physical and chemical soil indicators and judging type of grounding-grid corrosion; analyzing structural models of substation grounding grids, and applying a topology decomposition method for decomposition of the substation grounding grids; injecting sine alternating-current electrical signals to the substation grounding grids, an alternating-current acquisition sensor collecting electrical potential signals and transmitting the electrical potential signals to a direct-current signal acquisition system, and performing processing and displaying through a terminal processing unit; structuring structural models of small-sized grounding subgrids, and injecting direct-current large current signals to the small-sized grounding subgrids; transmitting acquired data to a terminal processing unit for analysis through node voltage and current values to acquire specific locations of grounding-grid corrosion failure points. With the method, the actual running situation of the grounding grids can be timely known and the locations of the failure points can be judged, technical support is provided for safe running of substations, and waste of manpower and material resources caused by extensively digging up the ground for checking step by step is avoided.
Description
Technical field
The present invention relates to a kind of electrical appliance kit, be specifically related to the method for the corrosion of a kind of substation ground network and end points diagnosis.
Background technology
The earthed system of transformer station safeguards power system security reliability service, the basic assurance ensureing operations staff and electrical equipment safety and important measures, and corrosion or the fracture of grounding grids will cause major accident and bring huge economic loss.The Grounding Grid situation that achieves a butt joint when not having a power failure and do not excavate earth mat is diagnosed, relevant staff is instructed to take certain remedial measures to corrosion earth mat with a definite target in view, significant to the safe operation reliability service of electric system.The state-detection of grounded screen is a very hard work, existing method is finding that ground network ground resistance is defective or after there is the accident that causes of earth mat, the method of being searched grounding grids breakpoint and corrosion section by dig on a wide area is very big with blindness, workload, need there is very large change to the environment of electric substation when carrying out actual detection, uncertainly can accurately detect quality, affect the safe operation of electric system.
Summary of the invention
The object of the present invention is to provide a kind of method that substation ground network corrodes and end points is diagnosed, detect data in order to gather ground net corrosion, fast, accurately and easily ground net corrosion situation is detected.
For achieving the above object, present invention employs following technical scheme:
A method for substation ground network corrosion and end points diagnosis, comprises the following steps:
(1) obtain different geographical grounding net of transformer substation corrosion rate and neighbouring soil physico-chemical index thereof, judge the type of ground net corrosion, determine each soil physico-chemical index, and index is sent into terminal handler analyzing and processing;
(2) analyze the structural model of grounding net of transformer substation by terminal handler, simultaneously in conjunction with the corrosion index of soil and approach degree between grounding net of transformer substation soil and grounding net of transformer substation soil to be predicted, application is flutterred and is opened up decomposition method and decompose grounding net of transformer substation;
(3) simple alternating current electric signal is injected to described grounding net of transformer substation, gather electric potential signal by ac signal acquisition sensor and transfer to alternating current-direct current signal acquiring system, by a microcontroller, described electric potential signal being transferred to terminal handler and carry out analyzing and processing and show;
(4) terminal handler draws the approximate region at corrosion failure point place according to electric potential signal distribution, and builds the structural model of a small-sized ground connection subnet with regard to this region, then injects D.C. high-current signal to this small-sized ground connection subnet;
(5) gathered node voltage and the current value of this small-sized ground connection subnet by described microprocessor controls, the data collected are transferred to terminal handler and is analyzed with founding mathematical models, draw the particular location of small-sized ground connection subnet corrosion failure point.
Further, described ac signal acquisition sensor comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal acquiring system.
Further, described alternating current-direct current signal acquiring system comprises data acquisition module, USB communication module, microcontroller, liquid crystal display and power supply module, wherein said data acquisition module input end connects the output terminal of detecting coil with Received signal strength, and output terminal is connected to microcontroller; Described USB communication module, power supply module and liquid crystal display are connected to microcontroller; Connected by USB communication module.
As shown from the above technical solution, the present invention can understand the practical operation situation of grounded screen and the position at failure judgement point place timely, for the safe operation of transformer station provides technical support, also can solve simultaneously and check whether grounded screen connects good difficult point, avoid the large-area ground that excavates to check waste on caused man power and material one by one.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
A kind of substation ground network corrosion as shown in Figure 1 and the method for end points diagnosis, comprise the following steps:
S1: obtain different geographical grounding net of transformer substation corrosion rate and neighbouring soil physico-chemical index thereof, judge the type of ground net corrosion, determine each soil physico-chemical index, and index is sent into terminal handler analyzing and processing;
S2: analyze the structural model of grounding net of transformer substation by terminal handler, simultaneously in conjunction with the corrosion index of soil and approach degree between grounding net of transformer substation soil and grounding net of transformer substation soil to be predicted, application is flutterred and is opened up decomposition method and decompose grounding net of transformer substation;
S3: inject simple alternating current electric signal to described grounding net of transformer substation, gather electric potential signal by ac signal acquisition sensor and transfer to alternating current-direct current signal acquiring system, by a microcontroller, described electric potential signal being transferred to terminal handler and carry out analyzing and processing and show;
S4: terminal handler draws the approximate region at corrosion failure point place according to electric potential signal distribution, and builds the structural model of a small-sized ground connection subnet with regard to this region, then inject D.C. high-current signal to this small-sized ground connection subnet;
S5: the data collected are transferred to terminal handler and analyzed with founding mathematical models by the node voltage and the current value that are gathered this small-sized ground connection subnet by described microprocessor controls, draws the particular location of small-sized ground connection subnet corrosion failure point.
In said method step, described ac signal acquisition sensor comprises detecting coil, and the signal output part of described detecting coil connects the input end of alternating current-direct current signal acquiring system.Described alternating current-direct current signal acquiring system comprises data acquisition module, USB communication module, microcontroller, liquid crystal display and power supply module, wherein said data acquisition module input end connects the output terminal of detecting coil with Received signal strength, and output terminal is connected to microcontroller; Described USB communication module, power supply module and liquid crystal display are connected to microcontroller; Connected by USB communication module.
The present invention can understand the practical operation situation of grounded screen and the position at failure judgement point place timely, for the safe operation of transformer station provides technical support, also can solve simultaneously and check whether grounded screen connects good difficult point, avoid the large-area ground that excavates to check waste on caused man power and material one by one.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (3)
1. a method for substation ground network corrosion and end points diagnosis, is characterized in that, comprise the following steps:
(1) obtain different geographical grounding net of transformer substation corrosion rate and neighbouring soil physico-chemical index thereof, judge the type of ground net corrosion, determine each soil physico-chemical index, and index is sent into terminal handler analyzing and processing;
(2) analyze the structural model of grounding net of transformer substation by terminal handler, simultaneously in conjunction with the corrosion index of soil and approach degree between grounding net of transformer substation soil and grounding net of transformer substation soil to be predicted, application is flutterred and is opened up decomposition method and decompose grounding net of transformer substation;
(3) simple alternating current electric signal is injected to described grounding net of transformer substation, gather electric potential signal by ac signal acquisition sensor and transfer to alternating current-direct current signal acquiring system, by a microcontroller, described electric potential signal being transferred to terminal handler and carry out analyzing and processing and show;
(4) terminal handler draws the approximate region at corrosion failure point place according to electric potential signal distribution, and builds the structural model of a small-sized ground connection subnet with regard to this region, then injects D.C. high-current signal to this small-sized ground connection subnet;
(5) gathered node voltage and the current value of this small-sized ground connection subnet by described microprocessor controls, the data collected are transferred to terminal handler and is analyzed with founding mathematical models, draw the particular location of small-sized ground connection subnet corrosion failure point.
2., according to the method that the substation ground network corrosion described in claim 1 and end points are diagnosed, it is characterized in that: described ac signal acquisition sensor comprises detecting coil, the signal output part of described detecting coil connects the input end of alternating current-direct current signal acquiring system.
3. the substation ground network corrosion according to claim 1 or 2 and the method for end points diagnosis, it is characterized in that: described alternating current-direct current signal acquiring system comprises data acquisition module, USB communication module, microcontroller, liquid crystal display and power supply module, wherein said data acquisition module input end connects the output terminal of detecting coil with Received signal strength, and output terminal is connected to microcontroller; Described USB communication module, power supply module and liquid crystal display are connected to microcontroller; Connected by USB communication module.
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Cited By (5)
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| CN105652155A (en) * | 2016-03-03 | 2016-06-08 | 国网山东省电力公司章丘市供电公司 | Transformer substation grounding grid fault corrosion monitoring method and system |
| CN105910977A (en) * | 2016-03-22 | 2016-08-31 | 全球能源互联网研究院 | Power transmission and transformation grounding material soil environment corrosivity comprehensive evaluation method |
| CN105675475B (en) * | 2015-12-25 | 2018-10-30 | 西安科技大学 | A kind of ground net corrosion speed grade prediction technique |
| CN109342821A (en) * | 2018-08-17 | 2019-02-15 | 武汉市康达电气有限公司 | Impedance ground and its resistive component measurement method, device and earth loop impedance test instrument |
| CN114136869A (en) * | 2021-10-26 | 2022-03-04 | 安徽大学 | Transformer substation grounding grid corrosion prediction system and use method thereof |
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| CN109342821A (en) * | 2018-08-17 | 2019-02-15 | 武汉市康达电气有限公司 | Impedance ground and its resistive component measurement method, device and earth loop impedance test instrument |
| CN109342821B (en) * | 2018-08-17 | 2021-06-08 | 武汉市康达电气有限公司 | Grounding impedance measuring method and device and grounding impedance tester |
| CN114136869A (en) * | 2021-10-26 | 2022-03-04 | 安徽大学 | Transformer substation grounding grid corrosion prediction system and use method thereof |
| CN114136869B (en) * | 2021-10-26 | 2024-01-19 | 安徽大学 | Substation grounding grid corrosion prediction system and application method thereof |
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Application publication date: 20150923 |