CN107290592A - Grounded screen electric resistance on-line monitoring system - Google Patents
Grounded screen electric resistance on-line monitoring system Download PDFInfo
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- CN107290592A CN107290592A CN201710535812.XA CN201710535812A CN107290592A CN 107290592 A CN107290592 A CN 107290592A CN 201710535812 A CN201710535812 A CN 201710535812A CN 107290592 A CN107290592 A CN 107290592A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 238000004458 analytical method Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000004891 communication Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 12
- 238000013480 data collection Methods 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- 230000006872 improvement Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 208000033999 Device damage Diseases 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a kind of grounded screen electric resistance on-line monitoring system, it is related to technical field of power systems.It includes alien frequencies power cell, data acquisition unit, Filtering Analysis unit, data processing unit, system control unit, communication unit and external system, alien frequencies power cell is connected with tested power equipment, tested power equipment is connected with data acquisition unit, data acquisition unit is connected with Filtering Analysis unit, Filtering Analysis unit is connected with data processing unit, system control unit is connected with alien frequencies power cell, data acquisition unit, Filtering Analysis unit and data processing unit respectively, and system control unit is connected by communication unit with external system.The present invention being capable of timely monitor earthing or grounding means characterisitic parameter, by the grounding resistance index variation tendency for monitoring earthing or grounding means in real time, relevant departments is grasped earth mat security performance in time and formulate corresponding counter-measure, effectively the prevention person and equipment safety accident occur.
Description
Technical field
The present invention relates to the e measurement technology of technical field of power systems, especially grounded screen electric resistance, and in particular to Yi Zhongjie
Earth mat resistance on-line monitoring system.
Background technology
In the last few years, domestic many places transformer station formed expansion accident because of thunderbolt, it is most with ground network ground resistance is unqualified has
Close, grounded screen plays a part of working earthing and protective grounding, when grounding resistance is excessive then：During generation earth fault, make neutrality
Point variation increase, may make sound phase and neutral point voltage too high, device damage is caused more than the level of insulating requirements.
When thunderbolt or lightning wave are attacked, because electric current is very big, very high residual voltage can be produced, make neighbouring equipment by
The threat of counterattack, and reduce grounded screen itself protection equipment (overhead transmission line and Substation Electric Equipment）Energized conductor it is resistance to
Thunder level, does not reach the requirement of design and damages equipment.Meanwhile, whether the grounding resistance of earthed system is qualified to be directly connected to change
Power station operations staff, substation equipment maintenance and repair personnel's personal safety；But because soil has corrosiveness to earthing or grounding means, during with operation
Between lengthening, earthing or grounding means corroded, and influences the safe operation of transformer station.
Therefore, it is necessary to strengthen the periodic monitoring to ground network ground resistance energetically；Substation ground network grounding resistance in operation
Measurement, due to the interference between the interference by system inflow earth mat electric current and test lead line, produces test result larger
Error.Particularly large-scale grounding network grounding resistance very little（Typically in 0.5 below Ω）, test can also be tied even if trickle interference
Fruit has a huge impact；If inaccurate to earth mat earth resistance, equipment is not only damaged, and such as earth mat can be caused
Change by mistake and the unnecessary loss such as make, so having not for whole transformer station to Grounding testing impedance and its test data
Negligible meaning.
The content of the invention
It is an object of the invention to provide one kind can timely monitor earthing or grounding means characterisitic parameter, by monitor in real time ground connection dress
The grounding resistance index variation tendency put, enables relevant departments to grasp earth mat security performance in time and formulate corresponding reply and arranges
Apply, the grounded screen electric resistance on-line monitoring system that effectively the prevention person and equipment safety accident occur.
In order to solve the problems existing in background technology, the present invention is to use following technical scheme：A kind of grounded screen electric resistance
On-line monitoring system, it includes alien frequencies power cell, data acquisition unit, Filtering Analysis unit, data processing unit, system control
Unit processed, communication unit and external system, alien frequencies power cell are connected with tested power equipment, and tested power equipment is adopted with data
Collect unit connection, data acquisition unit is connected with Filtering Analysis unit, and Filtering Analysis unit is connected with data processing unit, system
Control unit is connected with alien frequencies power cell, data acquisition unit, Filtering Analysis unit and data processing unit respectively, system control
Unit processed is connected by communication unit with external system.
As a further improvement on the present invention；Described data acquisition unit is multi-channel data collection unit.
As a further improvement on the present invention；Described system control unit is to use embeded processor control system.
As a further improvement on the present invention；Described alien frequencies power cell is designed using high power IGBT modules.
As a further improvement on the present invention；Described alien frequencies power cell, data acquisition unit, Filtering Analysis unit,
Data processing unit, system control unit, communication unit and external system are integrated in a 19-inch standard cabinet, cabinet
In transformer station's central station of floating dock, its electric current pole be arranged in around transformer station or stand with voltage pole in compared spacious region.
As a further improvement on the present invention；The distance between described electric current pole and tested earth mat for 10m to 20m it
Between.
As a further improvement on the present invention；The framework of described system control unit is comprising user mutual layer, outside business
Layer, Business Logic, data access layer and database are seen, user mutual layer is connected with each other with Business Facade, Business Facade
It is connected with each other respectively with data access layer and Business Logic, Business Logic is connected with each other with data access layer, data access
Layer and database are connected with each other.
After adopting the above technical scheme, the invention has the advantages that：
The analysis of grounding resistance on-line monitoring and fault diagnosis suitable for all kinds of power facility grounding nets, are widely used in all kinds of changes
Power station, thermal power plant, power station, current conversion station and all kinds of big-and-middle-sized industrial and mining enterprises etc..Being capable of timely monitor earthing or grounding means characteristic ginseng
Number, the system enables relevant departments to grasp earth mat in time by monitoring the grounding resistance index variation tendency of earthing or grounding means in real time
Security performance simultaneously formulates corresponding counter-measure, effectively the generation of the prevention person and equipment safety accident.System passes through mould on the spot
Block continuous acquisition earth mat Real-time Monitoring Data, carries out intelligent decision after background process, realize software safety over the ground can it is real-time
Control, is all used between Digitalization Mode, each subsystem with IEC61850 in data acquisition, transmission, processing and output procedure
Communication specification basis is built, and is met the networking secondary device hierarchy of digital transformer substation, is facilitated later stage implantation number
The extension work of Zi Hua transformer stations.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of embodiment provided by the present invention；
Fig. 2 is the schematic diagram of embodiment provided by the present invention；
Fig. 3 is the system architecture diagram of embodiment provided by the present invention；
Reference：
1-alien frequencies power cell；2-it is tested power equipment；3-data acquisition unit；4-Filtering Analysis unit；At 5-data
Manage unit；6-system control unit；7-communication unit；8-external system；9-user mutual layer；10-Business Facade；
11-Business Logic；12-data access layer；13-database.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing and specific implementation
Mode, the present invention will be described in further detail.It should be appreciated that embodiment described herein is only to explain this
Invention, is not intended to limit the present invention.
Referring to Fig. 1, present embodiment uses following technical scheme：A kind of grounded screen electric resistance on-line monitoring system,
It comprising alien frequencies power cell 1, tested power equipment 2, data acquisition unit 3, Filtering Analysis unit 4, data processing unit 5,
System control unit 6, communication unit 7 and external system 8, alien frequencies power cell 1 are connected with tested power equipment 2, are tested electric power
Equipment 2 is connected with data acquisition unit 3, and data acquisition unit 3 is connected with Filtering Analysis unit 4, Filtering Analysis unit 4 and data
Processing unit 5 is connected, system control unit 6 respectively with alien frequencies power cell 1, data acquisition unit 3, Filtering Analysis unit 4 and
Data processing unit 5 is connected, and system control unit 6 is connected by communication unit 7 with external system 8.Described alien frequencies power list
Member 1, data acquisition unit 3, Filtering Analysis unit 4, data processing unit 5, system control unit 6, communication unit 7 and outside system
System 8 is integrated in 2200*800*600mm 19-inch standard cabinet, and cabinet is arranged in transformer station's central station of floating dock, its electricity
Spacious region is compared in stream pole in being arranged in around transformer station or stand with voltage pole, between described electric current pole and tested earth mat
Distance is 10m between 20m.
Described data acquisition unit 3 is multi-channel data collection unit.
Described system control unit 6 is to use embeded processor control system.
Described alien frequencies power cell 1 is using the design of high power IGBT modules.
The present invention principle be：
All parts of grounding resistance monitoring system are integrated in 2200*800*600mm 19-inch standard cabinet, cabinet
In transformer station's central station of floating dock, its electric current pole be arranged in around transformer station or stand with voltage pole in compared spacious region, be
System is using current state-of-the-art digital frequency-selecting measurement（Electronic countermeasure）Technology, with superpower antijamming capability, is completely eliminated
The error brought by the interference of line-frequency induction, zero-sequence current, harmonic wave and spurious signal to measurement；System uses the big work(of pure sine wave
Rate signal source overcomes the limitation of two point alien frequencies interpolation method as test power supply, multifrequency point gathered data；The systemic-function is strong
Greatly, superior performance, easy to use.
Referring to Fig. 2, during the work of grounding resistance monitoring system, using high-power alien frequencies equipment in tested earth mat and electric current pole
Between evoke loop current, use plurality of voltages collector（Data acquisition unit 3）Synchronous acquisition each tested power equipment 2 and voltage
Voltage waveform between pole, calculates the alien frequencies voltage difference between each equipment and zero potential, so as to calculate by Filtering Analysis unit 4
The grounding resistance of each equipment.
The system output frequency is 45Hz~55Hz, and digital assay filtering technique is resisted using military electronic, anti-interference
Very competent, selecting frequency characteristic is sharp, full-automatic according to the change of grounding resistance by high-precision frequency-selecting+self shifter technology
Switching range, it is ensured that in the measurement accuracy of high-low-range scope.As shown in Figure 2：Variable frequency signal source output frequency is f stabilization
Power signal, f and power network power frequency f0 offsets are △ f.High-power signal enters transformer, coupling by equipment and equipment every
From matching circuit impedance exports larger signal.The electric current I of earth mat is flowed through in principle by measurement, and is produced on the net on ground
Pressure drop U, then impedance ground is Z=U/I.I.e. measurement frequency conversion voltage signal, current signal obtain corresponding parameter.
The system uses short distance measurement technology, and electric current pole and the distance between tested earth mat are shorter（10m is between 20m）,
Voltage pole position needs to determine by calibration mode, i.e., after the actual resistance that earth mat must be measured by conventional method, passed through
Heuristic find the zero-potential point between electric current pole and tested earth mat and by voltage pole lay in this place, for by tested earth mat,
For electric current pole, the linear circuit of the earth composition, in the case of being fixed in electric current pole position, the zero potential position can't be with survey
Try the change of electric current and change, therefore can guarantee that surveyed resistance is the impedance ground value of tested earth mat, so as to realize online prison
Brake.
Referring to Fig. 3, the framework of system control unit 6 in the present invention comprising user mutual layer 9, Business Facade 10,
Business Logic 11, data access layer 12 and database 13, user mutual layer 9 are connected with each other with Business Facade 10, outside business
See layer 10 to be connected with each other with data access layer 12 and Business Logic 11 respectively, Business Logic 11 and data access layer 12 are mutual
Connection, data access layer 12 and database 13 are connected with each other.
User mutual layer 9 calls the interface of Business Facade 10 to provide good interactive interface for final operation user, is used as
A part for realization；Business Facade 10 well gets up object collocation, passes through Business Logic 11 and data access layer 12
The service of offer, is that user mutual layer 9 provides consistent funcall interface；Database 13 is from the excellent SQL of cost performance
SERVER 2005, has the following characteristics that：Real client/server architecture, graphic user interface makes system pipes
Reason and data base administration DLL instrument more directly perceived, simple, abundant, are provided bigger for user's progress programming
Choice, SQL Server and Windows server 2003 are fully-integrated, make use of Windows many functions, such as send out
Send and received message, administrative login security etc..The need for meeting grounding resistance on-line condition monitoring well, number is realized
According to analysis, in real time data display, the function such as monitoring, form, parameter setting.
The invention has the characteristics that：
The grounding resistance variation tendency of multithreading, each equipment under test of on-line monitoring；Exclusive short distance measurement technology, substantially reduces ground connection
Resistance test difficulty；Power cell is designed using high power IGBT modules, reduces circuit complexity, lifts product stability,
Reduce power consumption；Using different-frequency measure technology, strong anti-interference performance improves the measuring precision；The communication party of mature and reliable
Formula, using computer network with standard network protocol, supports remote data transmission；Data acquisition reliability is high, gain range self-calibration function；Environment
It is adaptable, it is successfully applied to high and cold, high temperature, high humility, area；Interference free performance is high, and Electro Magnetic Compatibility meets GB/
T17626 and IEC61000 standards；Open database, can access power system LAN.
In addition, system employs modularized design, the application of high-performance embedded processor makes grounding resistance line monitoring system
System is more reliable and more stable, and with following features：Faster analytical cycle, completing an automatic measurement only needs 10 seconds, monitoring week
Phase can require any setting according to user, be recommended as 12 hours；Multi-channel sampling is designed, and standard configuration is 16 passages（It can be extended to 64
Passage）, multiple spot monitoring is realized, poll monitoring or Simultaneous Monitoring pattern may be selected；Designed using constant current output, system automatically according to
Soil resistivity change regulation output voltage, security of system is taken into account while ensureing test electric current enough；High-performance, high accuracy
Data collection and analysis, 24 bit resolutions, the design of high-efficiency frequency spectrum analysis software, measuring accuracy≤1m Ω；Using embeded processor
Control system, by power output, data acquisition, spectrum analysis, frequency-selective filtering, resistance calculations, data alarm, device status monitoring
It is integrated in one etc. multi-functional, situations such as be not in loss of data, substantially increases the reliability and stability of system；Each point is
Built between system with IEC61850 communication specifications basis, meet the networking secondary device hierarchy of digital transformer substation,
The later stage is facilitated to be implanted into the extension work of digital transformer substation；Support that there is provided similar monitoring device network work(for TCP/IP procotols
Can, some region of concentration remote diagnosis can be achieved；Scalability is high, can be easily integrated with other monitoring devices；System knot
Structure is compact, installs easy maintenance, user-friendly for operation.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It may be appreciated other embodiment.
Claims (10)
1. grounded screen electric resistance on-line monitoring system, it is characterised in that it includes alien frequencies power cell, data acquisition unit, filtering
Analytic unit, data processing unit, system control unit, communication unit and external system, alien frequencies power cell and tested electric power
Equipment is connected, and tested power equipment is connected with data acquisition unit, and data acquisition unit is connected with Filtering Analysis unit, filtering point
Analysis unit be connected with data processing unit, system control unit respectively with alien frequencies power cell, data acquisition unit, Filtering Analysis
Unit and data processing unit connection, system control unit are connected by communication unit with external system.
2. grounded screen electric resistance on-line monitoring system according to claim 1, it is characterised in that described data acquisition unit
For multi-channel data collection unit.
3. grounded screen electric resistance on-line monitoring system according to claim 1, it is characterised in that described system control unit
To use embeded processor control system.
4. grounded screen electric resistance on-line monitoring system according to claim 1, it is characterised in that described alien frequencies power cell
Designed using high power IGBT modules.
5. grounded screen electric resistance on-line monitoring system according to claim 1, it is characterised in that described alien frequencies power list
Member, data acquisition unit, Filtering Analysis unit, data processing unit, system control unit, communication unit and external system collect
In Cheng Yi 19-inch standard cabinet, cabinet is arranged in transformer station's central station of floating dock, and its electric current pole is arranged in power transformation with voltage pole
Spacious region around standing or in station.
6. grounded screen electric resistance on-line monitoring system according to claim 5, it is characterised in that described electric current pole is with being tested
The distance between earth mat is 10m between 20m.
7. grounded screen electric resistance on-line monitoring system according to claim 1, it is characterised in that described system control unit
Framework include user mutual layer, Business Facade, Business Logic, data access layer and database, user mutual layer and industry
Outward appearance of being engaged in layer is connected with each other, and Business Facade is connected with each other with data access layer and Business Logic respectively, Business Logic with
Data access layer is connected with each other, and data access layer and database are connected with each other；User mutual layer calls the Business Facade interface to be
Final operation user provides good interactive interface, the part as realization；Business Facade well arranges in pairs or groups object
Come, the service provided by Business Logic and data access layer provides consistent funcall interface for user mutual layer；Number
According to storehouse from the excellent SQL SERVER 2005 of cost performance.
8. grounded screen electric resistance on-line monitoring system, it is characterised in that during work, using high-power alien frequencies equipment tested earth mat with
Electric current interpolar evokes loop current, using between the synchronous acquisition of multi-channel data acquisition unit 3 each tested power equipment 2 and voltage pole
Voltage waveform, the alien frequencies voltage difference between each equipment and zero potential is calculated by Filtering Analysis unit 4, so as to calculate each equipment
Grounding resistance；Variable frequency signal source output frequency is the power signal of f stabilization, and f is △ f with power network power frequency f0 offsets.
9. high-power signal enters transformer, equipment and equipment blocking, matching circuit impedance are exported larger signal by coupling,
The electric current I of earth mat is flowed through in principle by measurement, and pressure drop U is produced on the net on ground, then impedance ground is Z=U/I.
10. i.e. measurement frequency conversion voltage signal, current signal obtain corresponding parameter.
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| CN201710535812.XA CN107290592A (en) | 2017-07-04 | 2017-07-04 | Grounded screen electric resistance on-line monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710535812.XA CN107290592A (en) | 2017-07-04 | 2017-07-04 | Grounded screen electric resistance on-line monitoring system |
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| CN201710535812.XA Pending CN107290592A (en) | 2017-07-04 | 2017-07-04 | Grounded screen electric resistance on-line monitoring system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037368A (en) * | 2017-12-28 | 2018-05-15 | 广东电网有限责任公司韶关供电局 | A kind of insulating resistance measuring device |
| CN108711938A (en) * | 2018-06-06 | 2018-10-26 | 珠海金华辰机电科技有限公司 | A kind of intelligent monitor system of traction institute earth mat |
| CN108931691A (en) * | 2018-09-05 | 2018-12-04 | 贵州南源电力科技股份有限公司 | A kind of grounded screen impedance short distance on-line monitoring system |
| CN109270356A (en) * | 2018-11-22 | 2019-01-25 | 国网宁夏电力有限公司宁东供电公司 | Substation grounding point impedance ground intelligent monitoring and controlling device and instrument controlling method |
| CN113534706A (en) * | 2021-07-12 | 2021-10-22 | 河南九域博慧方舟咨询发展有限公司 | Intelligent detection and analysis system for grounding resistance of transformer substation |
| CN114814431A (en) * | 2022-05-07 | 2022-07-29 | 中铁第一勘察设计院集团有限公司 | Electrified railway traction station grounding grid on-line monitoring system |
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| CN1243254A (en) * | 1999-08-16 | 2000-02-02 | 国家电力公司武汉高压研究所 | Isofrequency measuring method for earth resistance and apparatus thereof |
| CN102707167A (en) * | 2012-05-18 | 2012-10-03 | 华中科技大学 | State monitoring system for grounding grid based on industrial personal computer |
| CN206920522U (en) * | 2017-07-04 | 2018-01-23 | 河南天通电力有限公司 | Grounded screen electric resistance on-line monitoring system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243254A (en) * | 1999-08-16 | 2000-02-02 | 国家电力公司武汉高压研究所 | Isofrequency measuring method for earth resistance and apparatus thereof |
| CN102707167A (en) * | 2012-05-18 | 2012-10-03 | 华中科技大学 | State monitoring system for grounding grid based on industrial personal computer |
| CN206920522U (en) * | 2017-07-04 | 2018-01-23 | 河南天通电力有限公司 | Grounded screen electric resistance on-line monitoring system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037368A (en) * | 2017-12-28 | 2018-05-15 | 广东电网有限责任公司韶关供电局 | A kind of insulating resistance measuring device |
| CN108711938A (en) * | 2018-06-06 | 2018-10-26 | 珠海金华辰机电科技有限公司 | A kind of intelligent monitor system of traction institute earth mat |
| CN108931691A (en) * | 2018-09-05 | 2018-12-04 | 贵州南源电力科技股份有限公司 | A kind of grounded screen impedance short distance on-line monitoring system |
| CN109270356A (en) * | 2018-11-22 | 2019-01-25 | 国网宁夏电力有限公司宁东供电公司 | Substation grounding point impedance ground intelligent monitoring and controlling device and instrument controlling method |
| CN113534706A (en) * | 2021-07-12 | 2021-10-22 | 河南九域博慧方舟咨询发展有限公司 | Intelligent detection and analysis system for grounding resistance of transformer substation |
| CN114814431A (en) * | 2022-05-07 | 2022-07-29 | 中铁第一勘察设计院集团有限公司 | Electrified railway traction station grounding grid on-line monitoring system |
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