CN201378176Y - High-precision anti-interference excitation power supply for ground screen flaw comprehensively-diagnosing system in transformer substation - Google Patents
High-precision anti-interference excitation power supply for ground screen flaw comprehensively-diagnosing system in transformer substation Download PDFInfo
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- CN201378176Y CN201378176Y CN200920031932U CN200920031932U CN201378176Y CN 201378176 Y CN201378176 Y CN 201378176Y CN 200920031932 U CN200920031932 U CN 200920031932U CN 200920031932 U CN200920031932 U CN 200920031932U CN 201378176 Y CN201378176 Y CN 201378176Y
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- inverter
- filter circuit
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Abstract
The utility model discloses a high-precision anti-interference excitation power supply for a ground screen flaw comprehensively-diagnosing system in a transformer substation. The excitation power supply consists of an input filter circuit, a rectifying filter circuit, an inverter, an output rectifying filter circuit, an auxiliary power circuit, a control circuit, a protection action circuit and a detection circuit. When in work, after passing through the input filter circuit and the rectifying filter circuit, 380 V AC achieves the transformation from DC to AC, the rectified DC is changed to be DC, and finally a stable and reliable DC can be provided after output rectification and filtration according to the needs of load. The excitation power supply is used for the ground screen flaw comprehensively-diagnosing systems in transformer substations, and has the advantage of reasonable structure design, small volume, convenient use, high output of current and power, wide voltage variation range, good interference resisting capability, easy achievement of automatic transmission and the like.
Description
Technical field
The utility model content belongs to the utility model and belongs to electric power electrical apparatus attending device technical field, relates to a kind of anti-interference high precision excitation power supply that can be used for the substation ground network defect synthesis diagnosis system.
Background technology
The grounded screen of power system transformer substation is as the alternating current-direct current equipment ground and the thunder proof protection ground of transformer station; important role in safe operation to system; be to safeguard the power system security reliability service, ensure the important measures of electrical equipment and operations staff's safety.Exist in grounded screen under the situation of defective, as taking place former in electric system thereby the ground short circuit fault that causes or when being struck by lightning because of corrosion and damage etc., the local potential difference on the current potential of equipment ground point and the face of land all can raise unusually, and these will directly jeopardize equipment and operations staff's life security; More serious situation is to form big circulation or its insulation is breakdown at the measurement and control cable epidermis, make high pressure seal in the pulpit, further damage and be used to the secondary device of monitoring, controlling or make its malfunction, cause chain accident reaction thus, finally may cause the major accident of large-scale system and equipment even cause whole electrical network paralysis.It all is after finding that stake resistance is defective or breaking down that in the past grounded screen detects, and is electrically connected trouble spot or corrosion section by what excavation was searched grounded screen, and then determines whether the transformation of standing entirely.Though this method directly, reliably, but blindness is big, lack specific aim, can not stop the generation of accident in advance, length consuming time, quantities are big, the investment waste is many, to the extent of corrosion of excavation band iron and can continue problem such as uses and lack the quantification basis for estimation, both there be not detection means, there is not the respective detection standard yet.In addition, existing so far a large amount of old grounding net of transformer substation corrosion and damage are serious, need badly and transform, and rely on existing excavation detection method also to be difficult to effectively determine the scope and the precedence of Retrofit of substation grounding network.In a word, grounded screen fault has become a serious hidden danger of current safe operation of power system, and the breakpoint of diagnosis earth mat and the corrosion situation of earth mat have also become a great anti-accident measures of power department.
For solving the problem that prior art exists, the utility model deviser has proposed a kind of substation ground network defect synthesis diagnosis method, this diagnostic method has been set up the topological model of substation ground network and has been the software algorithm of the earth mat diagnostic system of core with the node voltage Optimization Model, in grounding net of transformer substation, find out corresponding current excitation node and potential reference node and the voltage measurement sensor is set at each node place, after applying pumping signal for the current excitation node, transport in the substation ground network defect synthesis diagnosis system that connects with sensor by detection signal that sensor obtains and with it, calculate the correlation parameter of earth mat branch road resistance with the software algorithm of substation ground network defect synthesis diagnosis system, and then determine the position of substation ground network accident defect.
In the design proposal of substation ground network defect synthesis diagnosis system, excitation power supply is an important component part.Excitation power supply is mainly used between the earth mat down conductor and applies excitation, thereby judge the defect situation of down conductor and ground connection major network, because the numerical value of tested grounded screen port resistance may be very little, also may be bigger, this depends on the degree of earth mat corrosion and the position of selected point of excitation, result of study shows the order of magnitude of resistance between m Ω～Ω, and this just requires excitation power supply can accurately measure the resistance of such order of magnitude.But, to eliminate maybe that therefore interference is reduced to minimum degree because the order of magnitude and the test data of power frequency interference are suitable at the scene.For the accuracy that guarantees to measure, at first strengthen the electric current of importing in the grounded screen (about 50A), its less important power frequency of avoiding is disturbed, and adopts good measures such as shielding.So measure the requirement of required input power supply be: output current and power are bigger, and the change in voltage scope is bigger, and antijamming capability is good, are suitable for and realize the robotization transmission.But various types of supply units well known in the art all can't satisfy above-mentioned request for utilization on performance at present.
The utility model content
The purpose of this utility model is to solve prior art problems, provide that a kind of project organization is reasonable, volume is little, easy to use, output current and power is big, the change in voltage scope is big, and antijamming capability is good, be suitable for the anti-interference high precision excitation power supply of substation ground network defect synthesis diagnosis system that realizes the robotization transmission.
Be used to realize that the technical solution of foregoing invention purpose is such: the anti-interference high precision excitation power supply of the substation ground network defect synthesis diagnosis system that is provided is by input filter circuit; current rectifying and wave filtering circuit; inverter; output rectifier and filter; auxiliary power circuit; control circuit; protection actuating circuit and testing circuit are formed; the output terminal of input filter circuit is connected to respectively with the input end of current rectifying and wave filtering circuit and auxiliary power circuit and connects; the output terminal of current rectifying and wave filtering circuit is connected to the output rectifier and filter input end behind inverter; the feedback current end difference tieback of output rectifier and filter is to the input end of control circuit and testing circuit; one road output terminal of auxiliary power circuit passes to the control input end of inverter through control circuit, and another road output terminal of auxiliary power circuit and the output terminal of testing circuit all pass to the control input end of inverter successively behind protection actuating circuit and control circuit.During work, realizing the AC/DC conversion behind 380V alternating current process input filter circuit and the current rectifying and wave filtering circuit, is more level and smooth direct current with the direct rectification of grid alternating current, for the next stage conversion; Through realizing the DC/AC conversion behind the inverter, the direct current after the rectification is become alternating current again, again by output rectification and filtering,, provide reliable and stable direct supply at last according to the load needs.
The beneficial effect that the utlity model has is: 1, the volume of excitation power supply is little, in light weight, conversion efficiency is high; 2, excitation power supply power is big, reaches 3.6k, has the buck regulatory function simultaneously; 3, power supply adopts three phase rectifier, and the dc ripple coefficient is low, less than 0.5%; 4, precision height, current voltmeter adopts 0.1 grade; 5, incorporating filter, instrument container has adopted electromangnetic spectrum simultaneously, has certain anti-interference capability; 6, adopted dual overvoltage, overcurrent protection and filtering, power supply wave shape is purified more.
Description of drawings
Accompanying drawing is the principle of work structured flowchart of an embodiment of the utility model
Embodiment
Below with reference to accompanying drawing the utility model content is described further, but actual fabrication structure of the present utility model and only limit to following embodiment.
Referring to accompanying drawing, the anti-interference high precision excitation power supply of substation ground network defect synthesis diagnosis system described in the utility model mainly is made up of input filter circuit, current rectifying and wave filtering circuit, inverter, output rectifier and filter, auxiliary power circuit, control circuit, protection actuating circuit and testing circuit.On the circuit draw bail; the output terminal of input filter circuit is connected to respectively with the input end of current rectifying and wave filtering circuit and auxiliary power circuit and connects; the output terminal of current rectifying and wave filtering circuit is connected to the output rectifier and filter input end behind inverter; the feedback current end difference tieback of output rectifier and filter is to the input end of control circuit and testing circuit; one road output terminal of auxiliary power circuit passes to the control input end of inverter through control circuit, and another road output terminal of auxiliary power circuit and the output terminal of testing circuit all pass to the control input end of inverter successively behind protection actuating circuit and control circuit.This excitation power supply mainly plays the effect that the switching regulator DC source of energization is provided in the substation ground network defect synthesis diagnosis system, with constant current voltage limiting mode work, have complete input, output overvoltage, output overcurrent or short circuit, defencive function such as overheated; During work, the 380V alternating current is realized the AC/DC conversion after importing filtering and rectifying and wave-filtering, be more level and smooth direct current with the direct rectification of grid alternating current, for the next stage conversion; Through realizing the DC/AC conversion behind the inverter, the direct current after the rectification is become alternating current again, this is the core that PWM type Switching Power Supply realizes PWM control, and its frequency is high more, and volume, weight are more little with the ratio of output power.Again by output rectification and filtering,, provide reliable and stable direct supply at last according to the load needs.In the practical structures; the input filter circuit of this excitation power supply can be finished with MF10; current rectifying and wave filtering circuit can be realized with DF06; inverter can adopt LR220A010 to realize; output rectifier and filter can be finished with MF10, and auxiliary power circuit can select bright dimension T-60B and T-45C to realize that control circuit can cooperate realization with common AT89C52 single-chip microcomputer and TLP521-2; the protection actuating circuit can realize that the optional delivery of testing circuit is intended the gating of switch CD4067 and finished with ULN2804.
Claims (1)
1; the anti-interference high precision excitation power supply of a kind of substation ground network defect synthesis diagnosis system; it is characterized in that by input filter circuit; current rectifying and wave filtering circuit; inverter; output rectifier and filter; auxiliary power circuit; control circuit; protection actuating circuit and testing circuit are formed; the output terminal of input filter circuit is connected to respectively with the input end of current rectifying and wave filtering circuit and auxiliary power circuit and connects; the output terminal of current rectifying and wave filtering circuit is connected to the output rectifier and filter input end behind inverter; the feedback current end difference tieback of output rectifier and filter is to the input end of control circuit and testing circuit; one road output terminal of auxiliary power circuit passes to the control input end of inverter through control circuit, and another road output terminal of auxiliary power circuit and the output terminal of testing circuit all pass to the control input end of inverter successively behind protection actuating circuit and control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920031932U CN201378176Y (en) | 2009-02-17 | 2009-02-17 | High-precision anti-interference excitation power supply for ground screen flaw comprehensively-diagnosing system in transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920031932U CN201378176Y (en) | 2009-02-17 | 2009-02-17 | High-precision anti-interference excitation power supply for ground screen flaw comprehensively-diagnosing system in transformer substation |
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| Publication Number | Publication Date |
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| CN201378176Y true CN201378176Y (en) | 2010-01-06 |
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| CN200920031932U Expired - Lifetime CN201378176Y (en) | 2009-02-17 | 2009-02-17 | High-precision anti-interference excitation power supply for ground screen flaw comprehensively-diagnosing system in transformer substation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006010A (en) * | 2010-12-23 | 2011-04-06 | 湖南科技大学 | Variable frequency driving control method and device for high-power mine hoist |
| CN102628964A (en) * | 2012-04-19 | 2012-08-08 | 河北省电力公司超高压输变电分公司 | Conductor position and grid structure detection system for transformer station grounding network |
| CN102998494A (en) * | 2012-12-14 | 2013-03-27 | 山东电力集团公司电力科学研究院 | Testing signal generating device for intelligent substation testing system |
| CN106018896A (en) * | 2016-06-18 | 2016-10-12 | 国网辽宁省电力有限公司抚顺供电公司 | Special programmable power source for pole grounding resistance measuring device |
-
2009
- 2009-02-17 CN CN200920031932U patent/CN201378176Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006010A (en) * | 2010-12-23 | 2011-04-06 | 湖南科技大学 | Variable frequency driving control method and device for high-power mine hoist |
| CN102628964A (en) * | 2012-04-19 | 2012-08-08 | 河北省电力公司超高压输变电分公司 | Conductor position and grid structure detection system for transformer station grounding network |
| CN102628964B (en) * | 2012-04-19 | 2014-07-16 | 国家电网公司 | Conductor position and grid structure detection system for transformer station grounding network |
| CN102998494A (en) * | 2012-12-14 | 2013-03-27 | 山东电力集团公司电力科学研究院 | Testing signal generating device for intelligent substation testing system |
| CN102998494B (en) * | 2012-12-14 | 2015-10-28 | 山东电力集团公司电力科学研究院 | A kind of test signal generation device for intelligent substation test system |
| CN106018896A (en) * | 2016-06-18 | 2016-10-12 | 国网辽宁省电力有限公司抚顺供电公司 | Special programmable power source for pole grounding resistance measuring device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHAANXI ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20140326 Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: SHAANXI ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20140326 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 710054 XI'AN, SHAANXI PROVINCE TO: 100761 XICHENG, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20140326 Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. Patentee after: State Grid Corporation of China Patentee after: Shaanxi Electric Power Research Institute Address before: 710054 No. 308 Youyi East Road, Shaanxi, Xi'an Patentee before: Shaanxi Electric Power Research Institute |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100106 |