CN107290592A - Grounded screen electric resistance on-line monitoring system - Google Patents

Grounded screen electric resistance on-line monitoring system Download PDF

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Publication number
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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CN
China
Prior art keywords
unit
power
data acquisition
equipment
line monitoring
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Pending
Application number
CN201710535812.XA
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Chinese (zh)
Inventor
屈博
张哲�
李传华
李长江
张辉
张轶敏
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Henan Tiantong Electric Power Co Ltd
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Henan Tiantong Electric Power Co Ltd
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Application filed by Henan Tiantong Electric Power Co Ltd filed Critical Henan Tiantong Electric Power Co Ltd
Priority to CN201710535812.XA priority Critical patent/CN107290592A/en
Publication of CN107290592A publication Critical patent/CN107290592A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates

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

Grounded screen electric resistance on-line monitoring system
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.
CN201710535812.XA 2017-07-04 2017-07-04 Grounded screen electric resistance on-line monitoring system Pending CN107290592A (en)

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Application Number Priority Date Filing Date Title
CN201710535812.XA CN107290592A (en) 2017-07-04 2017-07-04 Grounded screen electric resistance on-line monitoring system

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Cited By (2)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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

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