CN202948075U - Simple three-phase AC (Alternating Current) phase sequence tester - Google Patents
Simple three-phase AC (Alternating Current) phase sequence tester Download PDFInfo
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- CN202948075U CN202948075U CN 201220531438 CN201220531438U CN202948075U CN 202948075 U CN202948075 U CN 202948075U CN 201220531438 CN201220531438 CN 201220531438 CN 201220531438 U CN201220531438 U CN 201220531438U CN 202948075 U CN202948075 U CN 202948075U
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Abstract
The utility model relates to the three-phase AC phase sequence testing technical field and discloses a simple three-phase power-frequency AC phase sequence tester. In the phase sequence tester, a three-phase synchronous transformer pressure-reducing circuit connecting a phase-A AC, a phase-B AC and a phase-C AC is connected with an analog-phase-sequence-to-digital-timing-sequence conversion circuit through a three-phase half-wave rectification circuit. The analog-phase-sequence-to-digital-timing-sequence conversion circuit is further connected with a detecting light emitting diode LED through an identification circuit timing sequence trigger. The phase sequence tester enables phase sequence indication, disorder protection and off-sequence protection. Meanwhile, the tester can be used for testing of three-phase ACs with different frequencies.
Description
Technical field
The utility model relates to the phase order of 3-phase AC technical field of measurement and test, relates in particular to a kind of simple and easy phase order of 3-phase AC tester that can test the different frequency three-phase potential.
Background technology
What at present, China produced, provides and delivers is all three-phase alternating current.The phase sequence of three-phase alternating current is relativeness, and can determine at first that any one is A mutually, and what fall behind 120 ° of A phases is the B phase mutually, and what fall behind 120 ° of 240 ° of A phases and leading A phases is the C phase mutually.Three-phase alternating current is by three electric system that frequency is identical, the electromotive force amplitude equates, the alternating circuit of phase differential mutual deviation hexagonal angle forms.
Often need to measure the phase sequence of three-phase main-frequency alternating current when the electric installations such as transformer installation, motor wiring, maintenance, guarantee positive sort run or same-phase parallel running, avoid occurring the substantial equipment interruption of service.Prior art commonly used converts by the comparison between rotating coordinate system and rest frame and phase place by three-phase alternating current is sampled simultaneously, determines the order of phase place.The sampling section of this method and phase calculation formula are comparatively complicated, and the cost higher volumes is larger, can only be used for special-purpose phase order of 3-phase AC measuring instrument, for electric installation, maintainer increase load.
Summary of the invention
In order to simplify the phase sequence measuring process of three-phase main-frequency alternating current, measuring method is simplified, alleviate working load electric, the maintainer, the utility model proposes a kind of simple and easy phase sequence of three-phase industrial-frequency alternating current measuring instrument, can be converted to the phase propetry of alternating current the temporal characteristics of digital circuit and then detect, have the sampling of power supply single-point, System Construction be simple, final finished-product volume is small and exquisite, and test accurately.
In order to realize the foregoing invention purpose, the utility model adopts technical scheme as follows:
A kind of simple and easy phase order of 3-phase AC tester by the three-phase synchronous transformer pressure-reducing circuit that connects three-phase A, B, C alternating current, is connected with simulation phase sequence revolution word sequential circuit by three-plase half wave rectifier circuit; Simulation phase sequence revolution word sequential circuit is connected with the detection LED by identification circuit sequential trigger.
A kind of simple and easy phase order of 3-phase AC tester, described three-phase synchronous transformer pressure-reducing circuit replaces with the resistance capacitance reduction voltage circuit.
A kind of simple and easy phase order of 3-phase AC tester, described simulation phase sequence revolution word sequential circuit is photoelectric coupling circuit.
A kind of simple and easy phase order of 3-phase AC tester, described identification circuit sequential trigger is synchronous rs flip-flop.
Owing to adopting technical scheme as above, the utlity model has following superiority:
A kind of simple and easy phase order of 3-phase AC tester, by to the three-phase electricity step-down, then the three-phase electricity half-wave is shaped as the criteria triggers level, namely the phase propetry of alternating current is converted to the temporal characteristics of digital circuit, by totally digital circuit or with the intelligent digital circuit of single-chip microcomputer, level analysis is obtained phase sequence.Can accomplish phase sequence indication, order protection (with the digital circuit of single-chip microcomputer time) is fallen in out of order protection.Method of the present invention can be tested for the different frequency three-phase electricity simultaneously.
Description of drawings
Fig. 1 is simple and easy phase order of 3-phase AC measuring instrument schematic diagram.
Fig. 2 is the synchronous rs flip-flop schematic diagram.
Embodiment
As shown in Figure 1, 2, a kind of simple and easy phase order of 3-phase AC tester by the three-phase synchronous transformer pressure-reducing circuit that connects three-phase A, B, C alternating current, is connected with simulation phase sequence revolution word sequential circuit by three-plase half wave rectifier circuit; Simulation phase sequence revolution word sequential circuit is connected with the detection LED by identification circuit sequential trigger.
Described three-phase synchronous transformer pressure-reducing circuit replaces with the resistance capacitance reduction voltage circuit.
Described simulation phase sequence revolution word sequential circuit is photoelectric coupling circuit.
Described identification circuit sequential trigger is synchronous rs flip-flop.
Be the change-over circuit pattern for several once:
One, alternating current → synchronous transformation → half-wave rectification → simulation phase sequence revolution word sequential circuit;
Two, alternating current → resistance capacitance step-down → half-wave rectification → simulation phase sequence revolution word sequential circuit;
Three, alternating current → synchronous transformation → photoelectric coupling revolution word sequential circuit;
Four, alternating current → resistance capacitance step-down → photoelectric coupling revolution word sequential circuit.
Take industrial-frequency alternating current as example: three-phase alternating current is by three electric system that frequency is identical, the electromotive force amplitude equates, the alternating circuit of phase differential mutual deviation hexagonal angle forms.At present China produces, the phase sequence of the three-phase alternating current of dispensing is relativeness, can determine at first that any one be A mutually, fall behind A mutually 120 ° be the B phase mutually, 120 ° of 240 ° of backward A phases and leading A phases be the C phase mutually.
The utility model has proposed following measurement for these characteristics of three-phase alternating current: institute's test cross stream voltage is carried out half-wave rectification, alternating current after half-wave rectification is carried out the sequential processing, the front and back characteristic of three sequential of A B C when judging each cycle by digital circuit judges the phase sequence of three-phase electricity.
Such as: detect and a certainly constantly be in rising edge at t0 and suppose that this is mutually for the A phase, next only need the next sequential that rising edge occurs of judgement can be judged as the B phase, next only need the sequential of the next rising edge of judgement to be the C phase, thereby three-phase phase sequence sequentially can be determined.
During work, three-phase electricity cable access three-phase electricity sequenator accesses photoisolator after reaching the photoisolator rated voltage by resistance-capacitance depressurization, and photoisolator is again half-wave rectifier simultaneously, and internal body diodes is only passed through forward voltage; Be converted into the clock signal of digital circuit by the alternating current of photoisolator; These three clock signal access triggers; When access three-phase electricity sequenator was positive sequence, trigger U4 output terminal diode dodged one with the frequency one of 50HZ and goes out (being equal to Chang Liang).After when access three-phase electricity sequenator is inverted sequence, diode length is gone out, and needs to adjust access electric wire wire order this moment, corrects phase sequence purpose, following trigger truth table thereby reach;
| S | CP | R | Q |
| 1 | 1 | 0 | 1 |
| 1 | 0 | 0 | 0 |
| 0 | 1 | 0 | 0 |
| Arbitrary value | Arbitrary value | 1 | 0 |
When the synchronous rs flip-flop input end
S, CP, RValue is 1,1,0 o'clock, the synchronous rs flip-flop output terminal
QValue is 1 o'clock, and during for positive sequence, diode dodges the formula Chang Liang that goes out with the frequency one of 50HZ.
Claims (4)
1. simple and easy phase sequence of three-phase industrial-frequency alternating current measuring instrument is characterized in that: the phase sequence measuring instrument is connected with simulation phase sequence revolution word sequential circuit by three-plase half wave rectifier circuit by the three-phase synchronous transformer pressure-reducing circuit that connects three-phase A, B, C alternating current; Simulation phase sequence revolution word sequential circuit is connected with the detection LED by identification circuit sequential trigger.
2. a kind of easy phase sequence of three-phase industrial-frequency alternating current metering circuit as claimed in claim 1, it is characterized in that: described three-phase synchronous transformer pressure-reducing circuit replaces with the resistance capacitance reduction voltage circuit.
3. a kind of easy phase sequence of three-phase industrial-frequency alternating current metering circuit as claimed in claim 1, it is characterized in that: described simulation phase sequence revolution word sequential circuit is photoelectric coupling circuit.
4. a kind of easy phase sequence of three-phase industrial-frequency alternating current metering circuit as claimed in claim 1, it is characterized in that: described identification circuit sequential trigger is synchronous rs flip-flop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220531438 CN202948075U (en) | 2012-10-17 | 2012-10-17 | Simple three-phase AC (Alternating Current) phase sequence tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220531438 CN202948075U (en) | 2012-10-17 | 2012-10-17 | Simple three-phase AC (Alternating Current) phase sequence tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202948075U true CN202948075U (en) | 2013-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220531438 Expired - Fee Related CN202948075U (en) | 2012-10-17 | 2012-10-17 | Simple three-phase AC (Alternating Current) phase sequence tester |
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| CN (1) | CN202948075U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466555A (en) * | 2021-06-29 | 2021-10-01 | 汉中一零一航空电子设备有限公司 | Periodic alternating signal phase difference detection circuit and method |
-
2012
- 2012-10-17 CN CN 201220531438 patent/CN202948075U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466555A (en) * | 2021-06-29 | 2021-10-01 | 汉中一零一航空电子设备有限公司 | Periodic alternating signal phase difference detection circuit and method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20161017 |
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| CF01 | Termination of patent right due to non-payment of annual fee |