CN104459356A - Phase sequence included angle detection circuit - Google Patents
Phase sequence included angle detection circuit Download PDFInfo
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- CN104459356A CN104459356A CN201410786829.9A CN201410786829A CN104459356A CN 104459356 A CN104459356 A CN 104459356A CN 201410786829 A CN201410786829 A CN 201410786829A CN 104459356 A CN104459356 A CN 104459356A
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- diode
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- photoelectrical coupler
- phase sequence
- power supply
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Abstract
A phase sequence included angle detection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, a diode D3, a photocoupler U1 and a photocoupler U2. The phase sequence included angle detection circuit has the advantages that fewer devices are used, the high anti-interference capacity is achieved, and reliability of a whole system is improved; a periphery device is composed of the resistors and the diodes, the complexity is low, and the machinability of the production is improved; the 5000 Vrms isolation characteristic is achieved, and the strong and weak electricity isolation can be achieved; the pure hardware sampling system is obtained, no software algorithm supports are needed, and the use difficulty is lowered; the phase sequence included angle detection circuit can serve as a power grid open phase judgment device; the phase sequence included angle detection circuit can directly tolerate the megohm meter insulation measurement in the insulation and voltage resistance testing experiment process.
Description
Technical field
The invention belongs to electric signal field of measuring technique, particularly relate to a kind of phase sequence angle testing circuit.
Background technology
In a power distribution system, there is a large amount of three phase electric machine loads, it is inner relies on the cyclical variation of three-phase alternating-current supply to produce a constant magnetic field, and being used for the electric energy Conversion of Energy of motor stator side is the mechanical energy of rotor-side.
But if the phase sequence of three-phase supply is abnormal, it is unbalanced gently then to produce motor power transmission, easily occurs that efficiency utilizes low, heavy then there will be motor reversal, cause great industrial accident.
In sum, need to detect power phase parameter.At present, most power phase pick-up units, is merely able to detect the positive and negative of power phase, but can not detects the change of phase sequence angle, therefore can not ideally solve the problem.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of phase sequence angle testing circuit.
In order to achieve the above object, phase sequence angle testing circuit provided by the invention comprises: four resistor R1-R4, three diode D1-D3 and two photoelectrical coupler U1, U2; Power supply V1, V2, V3 are wherein the power supply of A, B, C phase of primary power; Described primary power A phase power supply V1 is connected with first pin of the first photoelectrical coupler U1 by the first diode D1, the first resistor R1 successively; Primary power B phase power supply V2 is connected with first pin of the second photoelectrical coupler U2 by the second diode D2, the second resistor R2 successively; Primary power C phase power supply V3 is connected with first pin of the first photoelectrical coupler U1, the second photoelectrical coupler U2 by the 3rd diode D3, the 3rd resistor R3 successively; The forward voltage of power supply is connected with the 4th pin of the first photoelectrical coupler U1 by the 4th resistance R4, the three-prong of the first photoelectrical coupler U1 is connected with the 4th pin of the second photoelectrical coupler U2, and the three-prong of the second photoelectrical coupler U2 is connected with reference to ground wire; The 4th pin A point of the first photoelectrical coupler U1 is the output point of this testing circuit, is connected with the signal input tube pin of harvester control module.
The first described resistor R1, the second resistor R2 are 30k ohmic resistor, and the 3rd resistor R3 is 10k ohmic resistor.
The first described diode D1, the second diode D2, the 3rd diode D3 are D1N4007 diode, wherein the anode of the first diode D1, the second diode D2 is connected with the power supply in loop, place respectively, and the negative electrode of the 3rd diode D3 is connected with the power supply in loop, place.
The sine wave of common alternating current can be transformed to square-wave signal by phase sequence angle testing circuit provided by the invention, and the control module being convenient to harvester carries out gathering and calculating; Compared with other modes, this circuit need not take a large amount of mcu resources, can ensure the fast-response of system.
Phase sequence angle testing circuit provided by the invention has following technique effect:
1, the present invention's device used is less, and has higher antijamming capability, improves the reliability of whole system.
2, peripheral components of the present invention is made up of resistance and diode, and complexity is lower, improves the processibility of product.
3, testing circuit of the present invention has the isolation characteristic of 5000Vrms, can realize the isolation of strong and weak electricity.
4, this testing circuit is pure hardware sampling system, does not need software algorithm support, reduces use difficulty.
5, this testing circuit can also to break phase judgment means as electrical network.
6, this pick-up unit can directly tolerate megger insulation measurement when dielectric voltage withstand test experiments.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of phase sequence angle testing circuit provided by the invention;
Fig. 2 is the digital output figure under this circuit general case;
Embodiment
Below in conjunction with the drawings and specific embodiments, phase sequence angle testing circuit provided by the invention is described in detail.
As shown in Figure 1, phase sequence angle testing circuit provided by the invention comprises: four resistor R1-R4, three diode D1-D3 and two photoelectrical coupler U1, U2; Power supply V1, V2, V3 are wherein the power supply of A, B, C phase of primary power;
Described primary power A phase power supply V1 is connected with first pin of the first photoelectrical coupler U1 by the first diode D1, the first resistor R1 successively; Primary power B phase power supply V2 is connected with first pin of the second photoelectrical coupler U2 by the second diode D2, the second resistor R2 successively; Primary power C phase power supply V3 is connected with first pin of the first photoelectrical coupler U1, the second photoelectrical coupler U2 by the 3rd diode D3, the 3rd resistor R3 successively; The forward voltage of power supply is connected with the 4th pin of the first photoelectrical coupler U1 by the 4th resistance R4, the three-prong of the first photoelectrical coupler U1 is connected with the 4th pin of the second photoelectrical coupler U2, and the three-prong of the second photoelectrical coupler U2 is connected with reference to ground wire; The 4th pin A point of the first photoelectrical coupler U1 is the output point of this testing circuit, is connected with the signal input tube pin of harvester control module.
The first described resistor R1, the second resistor R2 are 30k ohmic resistor, and the 3rd resistor R3 is 10k ohmic resistor.
The first described diode D1, the second diode D2, the 3rd diode D3 are D1N4007 diode, wherein the anode of the first diode D1, the second diode D2 is connected with the power supply in loop, place respectively, and the negative electrode of the 3rd diode D3 is connected with the power supply in loop, place.
The moment withstand voltage of described 30k Ohmage needs to reach 1000V, and its power needs to reach 3W; It is by utilizing the characteristic of the high value on whole piece loop, can by current limit in a very little scope, thus the heating of resistance is limited in a lower scope, simultaneously 30k Ohmage is owing to having the moment voltage endurance of 1000V, so can the excess current of restriction system under lightening pulse environment well; System can be made when the dielectric voltage withstand test experiments of the acceptance of work, need not picked-off from whole distribution system.
As shown in Figure 2, in figure, waveform is the waveform after system simulation Partial Transformation completes, and it is the square-wave signal of a standard.
This side is the time cycle 20ms of 50HZ distribution system wave period, when the voltage along with power supply V1, power supply V2 is greater than benchmark respectively time, the output terminal conducting respectively of the first photoelectrical coupler U1, the second photoelectrical coupler U2, when two photoelectrical couplers are all in conduction status time, A point directly with reference to ground wire is connected, in fig. 2, low level is shown as.When in the first photoelectrical coupler U1, the second photoelectrical coupler U2, any one does not have a conducting time, A point shows as high level at Fig. 2.
When electrical network Zhong You mono-road power supply breaks phase time, A point exports a high level always, can judge that electrical network occurs that power supply breaks the problem of phase thus.
The scheme of computation system directly measured by this circuit software different from the past, and this hardware solution, can take less MCU memory source, realizes the optimization of design.
Claims (3)
1. a phase sequence angle testing circuit, is characterized in that: described phase sequence angle testing circuit comprises: four resistor R1-R4, three diode D1-D3 and two photoelectrical coupler U1, U2; Power supply V1, V2, V3 are wherein the power supply of A, B, C phase of primary power; Described primary power A phase power supply V1 is connected with first pin of the first photoelectrical coupler U1 by the first diode D1, the first resistor R1 successively; Primary power B phase power supply V2 is connected with first pin of the second photoelectrical coupler U2 by the second diode D2, the second resistor R2 successively; Primary power C phase power supply V3 is connected with first pin of the first photoelectrical coupler U1, the second photoelectrical coupler U2 by the 3rd diode D3, the 3rd resistor R3 successively; The forward voltage of power supply is connected with the 4th pin of the first photoelectrical coupler U1 by the 4th resistance R4, the three-prong of the first photoelectrical coupler U1 is connected with the 4th pin of the second photoelectrical coupler U2, and the three-prong of the second photoelectrical coupler U2 is connected with reference to ground wire; The 4th pin A point of the first photoelectrical coupler U1 is the output point of this testing circuit, is connected with the signal input tube pin of harvester control module.
2. phase sequence angle testing circuit according to claim 1, is characterized in that: the first described resistor R1, the second resistor R2 are 30k ohmic resistor, and the 3rd resistor R3 is 10k ohmic resistor.
3. phase sequence angle testing circuit according to claim 1, it is characterized in that: the first described diode D1, the second diode D2, the 3rd diode D3 are D1N4007 diode, wherein the anode of the first diode D1, the second diode D2 is connected with the power supply in loop, place respectively, and the negative electrode of the 3rd diode D3 is connected with the power supply in loop, place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410786829.9A CN104459356B (en) | 2014-12-17 | 2014-12-17 | A kind of phase sequence presss from both sides angle detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410786829.9A CN104459356B (en) | 2014-12-17 | 2014-12-17 | A kind of phase sequence presss from both sides angle detection circuit |
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| Publication Number | Publication Date |
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| CN104459356A true CN104459356A (en) | 2015-03-25 |
| CN104459356B CN104459356B (en) | 2017-06-20 |
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| CN201410786829.9A Active CN104459356B (en) | 2014-12-17 | 2014-12-17 | A kind of phase sequence presss from both sides angle detection circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202929127U (en) * | 2012-11-27 | 2013-05-08 | 漳州市麒麟电子有限公司 | Circuit for detecting three-phase electricity phase sequence and open phase |
| CN103308816A (en) * | 2013-05-24 | 2013-09-18 | 康力电梯股份有限公司 | Detection circuit for three-phase alternating current phase dislocation and phase loss and detection method of detection circuit |
| CN203745553U (en) * | 2013-12-12 | 2014-07-30 | 广东瑞德智能科技股份有限公司 | Phase sequence detection circuit of three-phase power supply |
| CN204330899U (en) * | 2014-12-17 | 2015-05-13 | 施耐德万高（天津）电气设备有限公司 | A kind of phase sequence angle testing circuit |
-
2014
- 2014-12-17 CN CN201410786829.9A patent/CN104459356B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202929127U (en) * | 2012-11-27 | 2013-05-08 | 漳州市麒麟电子有限公司 | Circuit for detecting three-phase electricity phase sequence and open phase |
| CN103308816A (en) * | 2013-05-24 | 2013-09-18 | 康力电梯股份有限公司 | Detection circuit for three-phase alternating current phase dislocation and phase loss and detection method of detection circuit |
| CN203745553U (en) * | 2013-12-12 | 2014-07-30 | 广东瑞德智能科技股份有限公司 | Phase sequence detection circuit of three-phase power supply |
| CN204330899U (en) * | 2014-12-17 | 2015-05-13 | 施耐德万高（天津）电气设备有限公司 | A kind of phase sequence angle testing circuit |
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| CN104459356B (en) | 2017-06-20 |
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