CN201811998U - Three-phase alternating current (AC) phase sequence detecting device - Google Patents
Three-phase alternating current (AC) phase sequence detecting device Download PDFInfo
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- CN201811998U CN201811998U CN2010205358513U CN201020535851U CN201811998U CN 201811998 U CN201811998 U CN 201811998U CN 2010205358513 U CN2010205358513 U CN 2010205358513U CN 201020535851 U CN201020535851 U CN 201020535851U CN 201811998 U CN201811998 U CN 201811998U
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Abstract
The utility model belongs to the technical field of electricity, and relates to a three-phase alternating current (AC) phase sequence detecting device, aiming at solving the technical problems of complicated judgment process of phase sequence, a complicated judgment circuit, higher cost and the like in the prior art. The detecting device comprises an A-phase sampling unit, a B-phase sampling unit and a C-phase sampling unit which are connected onto three-phase electric equipment or a three-phase AC power supply and are used for acquiring electrical signals of all phases, a processor, a sequencing unit, a judging unit, an A storage unit, a B storage unit, a C storage unit, an analogue-to-digital converter and other parts. The three-phase AC phase sequence detecting device has the advantages that 1) the phase sequence state can be embodied in real time at any time of the power grid period, the phase sequence judgment is timely and effective, and the phase sequence can be accurately detected under the condition of serious distortion of a three-phase power grid, so that the safety of electricity utilization is improved; 2) when being applied to the digital control field, the three-phase AC phase sequence detecting device effectively simplifies the peripheral hardware judgment circuit; and 3) the device is simple and practical as well as strong in anti-interference capability, thus providing rapid and accurate three-phase AC phase sequence information.
Description
Technical field
The utility model belongs to the electroporation field, relates to three-phase alternating current, especially relates to a kind of three-phase alternating current phase sequence detection apparatus.
Background technology
In three-phase consumer application, the normal operation important influence of the phase ordered pair consumer of three-phase alternating current does not allow to occur opposite power supply phase sequence under a lot of situations.The power drive equipment that drags with three-phase alternating current is example, and as hoisting devices such as driving, crane, elevators etc., the equipment that alternating current generator drags is controlled the rotation direction of drive apparatus by the phase sequence that changes the motor supply voltage.Normally in service, in case phase sequence is anti-phase, rotation direction also will change, the therefore essential detection of introducing phase sequence in the control of drive apparatus, otherwise can cause equipment failure, even personal injury.Therefore, the correct detection of three-phase electricity phase sequence is the basic demand of a lot of three-phase consumers.
In the prior art, comparatively complicated for the circuit structure of phase sequence detection and protection, cost cost height, and security is relatively poor when practical application.Mainly contain two kinds of methods in the existing phase sequence measuring technique: method one: by the unbalance load of phase sequence measurement mechanism structure, cause each phase voltage imbalance of circuit of testing the phase sequence threephase load, magnitude relationship with unbalance voltage embodies by display device simultaneously, because phase sequence is not simultaneously, phase voltage magnitude relationship on same two phase loads is opposite, can judge phase sequence in view of the above.This method may cause erroneous judgement when severe three-phase is uneven.Method two: utilize the feature of three-phase alternating current instantaneous voltage waveform, at preset time every each phase place of alternate sweep; Calculate measured value by a kind of suitable predetermined method of determining and calculating, only calculate the symbol of the measured value in two moment and determine phase sequence, measure the three phase network signal with about 3 times of survey frequencies to mains frequency, measured value symbolic information according to two sampling instants, can judge the positive and negative of phase sequence, this method is based on waveform character in essence, and the quality of waveform is influential to the accuracy of measurement result.
For this reason, people have carried out long-term exploration, have proposed various solutions.For example; Chinese patent literature discloses a kind of three-phase power supply phase sequence and has detected and open-phase protection circuit [application number: 200620045859.5]; comprise the three-phase circuit processing signals; amplifying signal and trigger pip; wherein the three-phase circuit signal processing circuit is three-phase supply B; A; the C three-phase is respectively through diode D1; D2; the D3 half-wave rectification; again through resistance R 1; R2; the R3 decay; by by stabilivolt D4; D5; D6 and resistance R 4; R5; output is near the pulse signal of rectangle behind the mu balanced circuit slicing that R6 forms; deliver to digital integrated IC; export the rectangle negative pulse of an about 3MS of width (50 all alternating currents); the forward position of rectangle negative pulse is just in time synchronous with the mutually sinusoidal wave zero crossing of B, and negative pulse triggers trigger circuit control threephase load through amplifying circuit.If the wrong phase sequence or the phase failure, bidirectional triode thyristor SCR all can not open, and load end will not have electricity, avoid fault.The somebody has invented a kind of phase order of 3-phase AC determination methods and device [application number: 02118647.2], this scheme is determined the phase sequence of three-phase alternating current according to the sense of rotation at rotating vector angle, the sense of rotation at rotating vector angle is by gathering three-phase real-time voltage/current signal, ask for the phase angle difference of voltage/current rotating vector, calculate the rotating vector phase angle difference between the certain hour interval, determine the sense of rotation at rotating vector angle according to the symbol of the rotating vector phase angle difference of being calculated, the sense of rotation at rotating vector angle can be determined by calculating in the rotating vector phase angle difference of a civil power between the cycle, the rotating vector angle can be calculated according to inverse trigonometric function, the polarity discriminating of the two-phase value of its quadrature of living in after by coordinate transform, phase angle difference can obtain accurate stable data through Filtering Processing or after averaging.
Though such scheme has been realized the phase sequence detection, still exist the deterministic process complexity, decision circuitry complexity, the more high technical matters of cost.
Summary of the invention
The purpose of this utility model is at the problems referred to above, provide a kind of size based on the pairing moment of typical data to judge the phase sequence of three-phase alternating current, practicality is reliable, antijamming capability is strong, simple in structure, three-phase alternating current phase sequence detection apparatus easy to implement, that equipment cost is lower.
For achieving the above object, the utility model has adopted following technical proposal: three-phase alternating current phase sequence detection apparatus, it is characterized in that, this device comprises and is connected the A phase sampler unit that is used to gather each phase electric signal on three-phase consumer or the three-phase alternating-current supply, B phase sampler unit and C phase sampler unit, described A phase sampler unit, B phase sampler unit is connected with A/D converter respectively with C phase sampler unit and thereby A/D converter can carry out analog to digital conversion acquisition and the corresponding digital signal of described electric signal by certain sequential with described electric signal, it is A phase digital signal, B phase digital signal and C be digital signal mutually, described A/D converter be used to store the A A storage unit of digital signal mutually, the B storage unit that is used to store B phase digital signal is connected with the C storage unit that is used to store C phase digital signal, processor and A storage unit, the B storage unit is connected with the C storage unit, and processor can read the A storage unit respectively, typical data in the above-mentioned digital signal of B storage unit and C storage unit also calculates the pairing moment of described typical data by processor, be Ta, Tb and Tc, described processor comprises can be according to Ta, the sequencing unit that the size of Tb and Tc sorts and be connected the judging unit that to judge positive phase sequence or negative-phase sequence on the sequencing unit according to ranking results, and if Ta＜Tb＜Tc, or Tb＜Tc＜Ta, or Tc＜Ta＜Tb, then judgment unit judges is a positive phase sequence, if Ta＜Tc＜Tb, or Tc＜Tb＜Ta, or Tb＜Ta＜Tc, then judgment unit judges is a negative-phase sequence.
In above-mentioned three-phase alternating current phase sequence detection apparatus, described A phase sampler unit, B phase sampler unit and C phase sampler unit are any one in voltage transformer (VT), current transformer and the divider resistance.
Compared with prior art, the advantage of this three-phase alternating current phase sequence detection apparatus is: 1, can real-time embodying phase sequence state in any time in electrical network cycle, it is timely and effective that phase sequence is judged, and realized under the seriously distortion condition of three phase network the accurate detection of phase sequence is improved electrical safety.2, when being applied to digital control field, with effective simplification peripheral hardware decision circuitry.3, the phase sequence detection apparatus is simple and practical, and antijamming capability is strong, for three-phase consumer or three-phase alternating-current supply provide phase order of 3-phase AC information fast and accurately.
Description of drawings
Fig. 1 is the structured flowchart that the utility model provides.
Among the figure, three-phase consumer 1, three-phase alternating-current supply 2, A storage unit 31, B storage unit 32, C storage unit 33, processor 4, sequencing unit 41, judging unit 42, A phase sampler unit 51, B phase sampler unit 52, C phase sampler unit 53, A/D converter 6.
Embodiment
As shown in Figure 1, this three-phase alternating current phase sequence detection apparatus comprises and is connected A phase sampler unit 51, B phase sampler unit 52 and the C phase sampler unit 53 that is used to gather each phase electric signal on three-phase consumer 1 or the three-phase alternating-current supply 2.A phase sampler unit 51, B phase sampler unit 52 and C phase sampler unit 53 are connected with A/D converter 6 respectively and thereby A/D converter 6 can carry out analog to digital conversion by certain sequential with described electric signal and obtains and the corresponding digital signal of described electric signal, i.e. A phase digital signal, B phase digital signal and C digital signal mutually.A phase sampler unit 51, B phase sampler unit 52 and C phase sampler unit 53 are any one in voltage transformer (VT), current transformer and the divider resistance.The A storage unit 31, the B storage unit 32 that is used to store B phase digital signal of digital signal are connected with the C storage unit 33 that is used to store C phase digital signal A/D converter 6 mutually with being used to store A.
Processor 4 and A storage unit 31, B storage unit 32 is connected with C storage unit 33, and processor 4 can read A storage unit 31 respectively, typical data in the above-mentioned digital signal of B storage unit 32 and C storage unit 33 also calculates the pairing moment of described typical data by processor 4, be Ta, Tb and Tc, described processor 4 comprises can be according to Ta, sequencing unit that the size of Tb and Tc sorts 41 and be connected the judging unit 42 that to judge positive phase sequence or negative-phase sequence on the sequencing unit 41 according to ranking results, and if Ta＜Tb＜Tc, or Tb＜Tc＜Ta, or Tc＜Ta＜Tb, then judging unit 42 is judged as positive phase sequence, if Ta＜Tc＜Tb, or Tc＜Tb＜Ta, or Tb＜Ta＜Tc, then judging unit 42 is judged as negative-phase sequence.
This Device Testing process is as follows:
A, signals collecting: gather three-phase consumer 1 each phase electric signal respectively or gather three-phase alternating-current supply 2 each the phase electric signal that are connected on the three-phase consumer 1 respectively, the electric signal that is collected is A phase signals, B phase signals and C phase signals.
The A phase signals here, B phase signals and C phase signals are by voltage signal or current signal.A phase signals, B phase signals and C phase signals are gathered by A phase sampler unit 51, B phase sampler unit 52 and C phase sampler unit 53 respectively.A phase sampler unit 51, B phase sampler unit 52 and C phase sampler unit 53 are any one in voltage transformer (VT), current transformer and the divider resistance.
B, signal Processing: obtain and the corresponding digital signal of described electric signal thereby A phase signals, B phase signals and C phase signals are carried out analog to digital conversion by certain sequential, be A phase digital signal, B phase digital signal and C digital signal mutually, with A phase digital signal, B phase digital signal and C mutually digital signal be stored in A storage unit 31, B storage unit 32 and C storage unit 33 respectively.
Thereby the A phase signals here, B phase signals and C phase signals are carried out analog to digital conversion by A/D converter 6 by certain sequential respectively and are obtained corresponding A digital signal, B phase digital signal and C digital signal mutually mutually.
C, phase sequence judge: read the typical data in the above-mentioned digital signal of A storage unit 31, B storage unit 32 and C storage unit 33 respectively by processor 4, and by the 4 calculating pairing moment of described typical data of processor, be Ta, Tb and Tc, processor 4 sorts according to the size of Ta, Tb and Tc then, if Ta＜Tb＜Tc or Tb＜Tc＜Ta or Tc＜Ta＜Tb, then be judged as positive phase sequence, if Ta＜Tc＜Tb or Tc＜Tb＜Ta or Tb＜Ta＜Tc then are judged as negative-phase sequence.
The typical data here is any in zero crossing, maximal value or the minimum value.Certainly, can choose other numerical value according to actual conditions.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although this paper has used terms such as three-phase consumer 1, three-phase alternating-current supply 2, A storage unit 31, B storage unit 32, C storage unit 33, processor 4, sequencing unit 41, judging unit 42, A phase sampler unit 51, B phase sampler unit 52, C phase sampler unit 53, A/D converter 6 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present utility model more easily; They are construed to any additional restriction all is contrary with the utility model spirit.
Claims (2)
1. three-phase alternating current phase sequence detection apparatus, it is characterized in that, this device comprises and is connected the A phase sampler unit (51) that is used to gather each phase electric signal on three-phase consumer (1) or the three-phase alternating-current supply (2), B phase sampler unit (52) and C phase sampler unit (53), described A phase sampler unit (51), B phase sampler unit (52) be connected with A/D converter (6) respectively with C phase sampler unit (53) and A/D converter (6) thus described electric signal can be carried out analog to digital conversion by certain sequential obtains and the corresponding digital signal of described electric signal, it is A phase digital signal, B phase digital signal and C be digital signal mutually, described A/D converter (6) be used to store the A A storage unit (31) of digital signal mutually, the B storage unit (32) that is used to store B phase digital signal is connected with the C storage unit (33) that is used to store C phase digital signal, processor (4) and A storage unit (31), B storage unit (32) is connected with C storage unit (33), and processor (4) can read A storage unit (31) respectively, typical data in the above-mentioned digital signal of B storage unit (32) and C storage unit (33) also calculates the pairing moment of described typical data by processor (4), be Ta, Tb and Tc, described processor (4) comprises can be according to Ta, the sequencing unit that the size of Tb and Tc sorts (41) and be connected the judging unit (42) that to judge positive phase sequence or negative-phase sequence on the sequencing unit (41) according to ranking results, and if Ta＜Tb＜Tc, or Tb＜Tc＜Ta, or Tc＜Ta＜Tb, then judging unit (42) is judged as positive phase sequence, if Ta＜Tc＜Tb, or Tc＜Tb＜Ta, or Tb＜Ta＜Tc, then judging unit (42) is judged as negative-phase sequence.
2. three-phase alternating current phase sequence detection apparatus according to claim 1, it is characterized in that described A phase sampler unit (51), B phase sampler unit (52) and C phase sampler unit (53) are any one in voltage transformer (VT), current transformer and the divider resistance.
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| CN2010205358513U CN201811998U (en) | 2010-09-14 | 2010-09-14 | Three-phase alternating current (AC) phase sequence detecting device |
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| CN2010205358513U CN201811998U (en) | 2010-09-14 | 2010-09-14 | Three-phase alternating current (AC) phase sequence detecting device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004193A (en) * | 2010-09-14 | 2011-04-06 | 徐国治 | Three-phase alternating-current phase sequence detecting method and device thereof |
| CN102353852A (en) * | 2011-08-26 | 2012-02-15 | 广州智光电气股份有限公司 | High-voltage solid soft starter and phase sequence recognizing method thereof |
| CN104062513A (en) * | 2014-05-20 | 2014-09-24 | 东南大学 | Secondary phase detecting instrument and method |
| CN104215839A (en) * | 2014-09-19 | 2014-12-17 | 中国一冶集团有限公司 | Method and device for detecting phase sequence of electric motor by utilizing extremely low frequency current |
| CN106546832A (en) * | 2016-12-08 | 2017-03-29 | 珠海格力电器股份有限公司 | A kind of detection means and its using method of three phase mains |
| CN106597134A (en) * | 2016-12-31 | 2017-04-26 | 国家电网公司 | Intelligent distribution network secondary system phase sequence automatic check apparatus |
| CN111366796A (en) * | 2020-03-23 | 2020-07-03 | 黑龙江特通电气股份有限公司 | Phase sequence detection method of three-phase alternating current power supply |
-
2010
- 2010-09-14 CN CN2010205358513U patent/CN201811998U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004193A (en) * | 2010-09-14 | 2011-04-06 | 徐国治 | Three-phase alternating-current phase sequence detecting method and device thereof |
| CN102353852A (en) * | 2011-08-26 | 2012-02-15 | 广州智光电气股份有限公司 | High-voltage solid soft starter and phase sequence recognizing method thereof |
| CN104062513A (en) * | 2014-05-20 | 2014-09-24 | 东南大学 | Secondary phase detecting instrument and method |
| CN104215839A (en) * | 2014-09-19 | 2014-12-17 | 中国一冶集团有限公司 | Method and device for detecting phase sequence of electric motor by utilizing extremely low frequency current |
| CN104215839B (en) * | 2014-09-19 | 2017-04-12 | 中国一冶集团有限公司 | Method and device for detecting phase sequence of electric motor by utilizing extremely low frequency current |
| CN106546832A (en) * | 2016-12-08 | 2017-03-29 | 珠海格力电器股份有限公司 | A kind of detection means and its using method of three phase mains |
| CN106597134A (en) * | 2016-12-31 | 2017-04-26 | 国家电网公司 | Intelligent distribution network secondary system phase sequence automatic check apparatus |
| CN111366796A (en) * | 2020-03-23 | 2020-07-03 | 黑龙江特通电气股份有限公司 | Phase sequence detection method of three-phase alternating current power supply |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110427 Termination date: 20130914 |