CN101714779B - Directional current based shutting method of high-speed switching device of industrial enterprise power supply - Google Patents
Directional current based shutting method of high-speed switching device of industrial enterprise power supply Download PDFInfo
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- CN101714779B CN101714779B CN2009102643175A CN200910264317A CN101714779B CN 101714779 B CN101714779 B CN 101714779B CN 2009102643175 A CN2009102643175 A CN 2009102643175A CN 200910264317 A CN200910264317 A CN 200910264317A CN 101714779 B CN101714779 B CN 101714779B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The present invention relates to a directional current based shutting method of a high-speed switching device of an industrial enterprise power supply, which is characterized in that a current amplitude is increased when a working bus and equipment of the working bus generate unsymmetrical faults or symmetrical fault symmetrical faults so as to obtain a fault current identification criterion, a criterion of directional current of a busbar incoming switch, which flows to the working bus, and a criterion of the working bus generating high negative sequence voltage or low working bus voltage; and a shutting logic is formed by identifying whether the faults are generated on the working bus and the load of the working bus. The present invention forms the effective and reliable shutting method by optimally combining relative independent data and puts an emphasis on identifying the faults generated on the working bus positioned at the lower switching side of the industrial enterprise power supply and the loading equipment; in addition, under the fault condition, if the switching of the industrial enterprise power supply is falsely operated, a standby power supply can be arranged in the faults to aggravate accidents, thus the shutting method can effectively shut the switching under the condition of the faults through reasonably arrangement and ensure the safety.
Description
Technical field
The present invention relates to a kind of new blocking method of high-speed switching device of industrial enterprise power supply, mainly be applicable to the power transfer device of the mesohigh electric substation of industrial enterprises such as petrochemical industry, iron and steel, metallurgy, coal, can be under working bus bar and institute's on-load thereof break down situation effective locking power transfer device, avoid stand-by power supply is incorporated on the fault.
Background technology
Transformer station of industrial enterprise generally adopts the dual power supply pattern to improve power supply reliability.According to the difference of operational mode, stand-by power supply is divided into stand-by heat and cold standby.When working power take place various have influence on the unusual or fault of producing the normal operation of load after, must be apace with the stand-by power supply input, with normally carrying out of guaranteeing to produce.Common at present use backup auto-activating device is realized the switching between working power and the stand-by power supply, but because the characteristics of backup auto-activating device self caused stand-by power supply input needs some seconds, this moment, working bus bar voltage was reduced to below 20%, even stand-by power supply input, producing load also can be because of the too low jumping machine of operating voltage, and a large amount of restarting substantially of motor can't be realized.More there are some industrial enterprises without hesitation that prepared auto restart is out of service.
At above-mentioned situation, mature experience based on power plant service power apparatus for fast switching, characteristics in conjunction with transformer station of industrial enterprise, develop the high-speed switching device of industrial enterprise power supply that is specifically designed to this field, utilizing quick and catch principle the same period can be in 500ms, just with the stand-by power supply input, working bus bar voltage is remained on more than 70% about the fastest 100ms, guarantee to produce the continuous operation of load.Along with smooth implementation and the successful Application in enterprises such as petrochemical industry, iron and steel, to have reduced that greatly enterprise hinders for some reason etc. outside the plan cuts off the loss that causes, and has obtained good social benefit and economic benefit, obtains user's abundant affirmation.
That produces is no doubt important continuously, and safety can not be ignored especially.After breaking down, working power to simultaneously, when loads such as working bus bar and institute's translator thereof break down, must prevent that accident enlarges in time with the stand-by power supply input with the stand-by power supply input.If do not take the locking measure in this case, inlet wire side switch protection action tripping causes the working bus bar decompression, causes switching device shifter to start, and with the stand-by power supply input, produces serious consequence.All are necessary to adopt a sensitive locking criterion reliably to identify working bus bar and following breaking down very much.In power plant's auxiliary power high-speed transfer device; utilize the protection contact at cut-in operation bus service entrance switch place to realize locking; because working bus bar and following equipment thereof are protected in the protection at service entrance switch place; so after this switch place protection action; give fast cutting apparatus with actuating signal, locking is switched.But because unprotect herein may appear in the particularity of worker enterprise, the situation of perhaps protecting action connection point to draw, and industrial enterprise's serious interference rely on the external connector locking to have certain hidden danger merely.So must exploitation can be applicable to the latching logic of high-speed switching device of industrial enterprise power supply, rely on self Information Monitoring to come failure judgement point position, in time reliable locking device switching behavior is guaranteed safety.
Summary of the invention
The objective of the invention is, propose a kind of shutting method of high-speed switching device of industrial enterprise power supply, working bus bar and institute's on-load thereof break down and can switch by in time reliable locking power supply under the situation, avoid stand-by power supply is incorporated on the fault expansion that causes the accident.Can rely on external connector to carry out locking no longer merely.
Technical scheme of the present invention is: based on the shutting method of high-speed switching device of industrial enterprise power supply of directional current, when working bus bar and institute's carrying device generation unbalanced fault or symmetric fault, current amplitude increases, the directional current at bus service entrance switch place flows to the working bus bar criterion, big negative sequence voltage or bus low-voltage criterion appear in bus, identify fault and whether occur in working bus bar and institute's on-load thereof, constitute latching logic;
1) fault current identical criterion: I＞I
Set, wherein I is the monophase current of certain phase, I
SetBe setting value;
2) directional current identical criterion: certain two alternate voltage and corresponding electric current angle even satisfy arbitrary formula condition in following three formulas between-90～90 degree,
Formula 1
3) negative sequence voltage criterion: U
2＞U
2set, U wherein
2Be working bus bar negative sequence voltage, U
2setBe the negative sequence voltage threshold value;
4) low-voltage criterion: U
Max＜U
Set, U wherein
MaxBe the maximum of working bus bar three-phase voltage, U
SetBe the voltage setting value;
Satisfying criterion 1), 2) and 3) and or satisfy criterion 1), 2) and 4) condition under, then power supply rapid switching device locking.
Flow to the criterion of working bus bar with current amplitude increase and direction as the external power fault detect; With bus negative sequence voltage or low-voltage criterion as preventing the erroneous judgement means.
The present invention utilizes apparatus for fast switching to have collection capacity now, by logical operation and combination, realizes expectation target.
The invention has the beneficial effects as follows: the inventive method is applied to power supply switches fast, the mistake that can effectively avoid the user to worry is most switched the problem that causes the accident and enlarge, make the quick switching of power supply can more effectively be applied to transformer station of industrial enterprise, for the continuous safety in production of enterprise provides support.Rely on external connector to carry out locking, even also can make the power supply rapid switching device locking during locking cisco unity malfunction at service entrance switch place especially no longer merely.Can realize the Secure Application of the transformer station of industrial enterprise of power supply rapid switching device.
Description of drawings
Fig. 1: typical industrial enterprise's transformer station's wiring and operational mode;
Fig. 2: the latching logic figure that the present invention is complete.
Embodiment
The present invention is dissolved into power supply rapid switching device with directional current criterion, negative sequence voltage criterion and low-voltage criterion, constitutes latching logic; During normal the operation, service entrance switch place current amplitude is less than rated value, and direction flows to working bus bar, and the working bus bar voltage magnitude is between 95%～105%, and phase sequence is a positive sequence.When working bus bar and institute's carrying device generation unbalanced fault or symmetric fault, current amplitude increases, and direction flows to working bus bar, and bigger negative sequence voltage or low-voltage appear in bus.
Flow to the main criterion of working bus bar with current amplitude increase and direction as the external power fault detect.
With bus negative sequence voltage and low-voltage criterion as preventing the erroneous judgement means.
Under the normal condition, the sense of current at switch 1DL shown in Figure 1 place should flow to bus, and amplitude is lower than rated value operation, and working bus bar three-phase voltage amplitude should operation between specified 95%～105%, and phase sequence is a positive sequence, and promptly negative sequence voltage should approach zero.Fault is divided into two kinds of situations to be described respectively: one, when single-phase or phase to phase fault take place for working bus bar and institute carrying device thereof, the electric current of the corresponding phase in service entrance switch place increases and is fault current, and direction flows to working bus bar, and bus produces bigger negative sequence voltage; Two, when the three-phase symmetric fault took place, service entrance switch place three-phase current all showed as fault current, and direction flows to working bus bar, and the bus three-phase voltage reduces.1DL, 2DL are switch (circuit breaker).
Fault current recognition component: I＞I
Set, wherein I is a monophase current, I
SetBe setting value, carry out verification according to on-the-spot rated current and the maximum load current that may exist and adjust;
Sense of current recognition component:
Wherein α is maximum sensitive angle, gets 45 degree.
Negative sequence voltage element: U
2＞U
2set, U wherein
2Be working bus bar negative sequence voltage, U
2setBe the negative sequence voltage threshold value;
Lower voltage components: U
Max＜U
Set, U wherein
MaxBe the maximum of working bus bar three-phase voltage, U
SetBe the voltage setting value.
By making up above-mentioned each element, can obtain not only a sensitivity but also reliable latching logic, as Fig. 2.The final Secure Application that realizes the transformer station of industrial enterprise of power supply rapid switching device.
This criterion needs device to insert the three-phase current and the bus three-phase voltage at service entrance switch place.The device program interrupts all judging in each sampling whether this latching logic satisfies, in case all conditions satisfies,, do not satisfy up to detecting this latching logic through the switching state of inner setting delay lock device, device just enters recharge logic automatically and judges each logic determines of switching.
In the logic, I
SetBe the overcurrent definite value, can adjust, should escape the maximum load current that may exist; U
2setBe the negative sequence voltage threshold value, internal fixation is 8V; U
SetFor judging the definite value of low pressure, internal fixation is 60% rated voltage; T is fixed as 25ms for time-delay.
The definition of logical symbol among Fig. 2:
“ ﹠amp; " presentation logic " with "; "+" presentation logic " or ".
Claims (3)
1. based on the shutting method of high-speed switching device of industrial enterprise power supply of directional current, it is characterized in that when working bus bar and institute's carrying device generation unbalanced fault or symmetric fault, according to judging that the fault current identical criterion that current amplitude increases, the directional current at judgement bus service entrance switch place flow to directional current identical criterion, bus negative sequence voltage criterion and the low-voltage criterion of working bus bar, identify fault and whether occur in working bus bar and institute's on-load thereof, constitute latching logic;
1) fault current identical criterion: I＞I
Set, wherein I is the monophase current of certain phase, I
SetBe setting value;
2) directional current identical criterion: certain two alternate voltage and corresponding electric current angle promptly satisfy arbitrary formula condition in following three formulas between-90～90 degree,
Formula 1
Wherein α is maximum sensitive angle, gets 45 degree;
3) negative sequence voltage criterion: U
2＞U
2set, U wherein
2Be working bus bar negative sequence voltage, U
2setBe the negative sequence voltage threshold value;
4) low-voltage criterion: U
Max＜U
Set, U wherein
MaxBe the maximum of working bus bar three-phase voltage, U
SetBe the voltage setting value;
Satisfying criterion 1), 2) and 3) or satisfy criterion 1), 2) and 4) condition under, then power supply rapid switching device locking.
2. the shutting method of high-speed switching device of industrial enterprise power supply based on directional current according to claim 1 is characterized in that I
SetBe the overcurrent definite value, the operating current when escaping on the working bus bar load synthesis starting is adjusted; U
2setBe the negative sequence voltage threshold value, internal fixation is 8V.
3. the shutting method of high-speed switching device of industrial enterprise power supply based on directional current according to claim 1 is characterized in that U
SetFor judging the definite value of low pressure, internal fixation is 60% rated voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102643175A CN101714779B (en) | 2009-12-18 | 2009-12-18 | Directional current based shutting method of high-speed switching device of industrial enterprise power supply |
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|---|---|---|---|
| CN2009102643175A CN101714779B (en) | 2009-12-18 | 2009-12-18 | Directional current based shutting method of high-speed switching device of industrial enterprise power supply |
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| CN101714779A CN101714779A (en) | 2010-05-26 |
| CN101714779B true CN101714779B (en) | 2011-09-28 |
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| CN102738891A (en) * | 2012-07-03 | 2012-10-17 | 国电南瑞科技股份有限公司 | Wide-area spare power automatic switching logic unified expression method and after-operation overload processing method |
| CN102904221B (en) * | 2012-09-19 | 2016-01-06 | 深圳供电局有限公司 | A kind of intelligent substation 10kV switchgear house prepared auto restart blocking method and device |
| CN111463756B (en) * | 2020-05-07 | 2022-04-22 | 华电电力科学研究院有限公司 | Protection locking joint optimization method based on high-service bus protection and fast switching device |
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