CN203299274U - High tension switchgear phase measurement circuit - Google Patents
High tension switchgear phase measurement circuit Download PDFInfo
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- CN203299274U CN203299274U CN2013203916542U CN201320391654U CN203299274U CN 203299274 U CN203299274 U CN 203299274U CN 2013203916542 U CN2013203916542 U CN 2013203916542U CN 201320391654 U CN201320391654 U CN 201320391654U CN 203299274 U CN203299274 U CN 203299274U
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Abstract
The utility model discloses a high tension switchgear phase measurement circuit. Inputted two circuits of voltage signals with same frequency and different phases enter a waveshaping circuit through two sets of voltage transformers to convert the voltage signals into rectangular wave signals; and a width of two circuits of wave-shaped positive pulse, i.e., a time difference corresponded with a phase difference of two circuits of voltage signals to be measured is obtained through a phase demodulation circuit; later the signals are conveyed to an external interruption control pin of a singlechip controller; the singlechip controller processes data to finally obtain required phase values which are displayed through a nixie tube or a liquid crystal display tube. The high tension switchgear phase measurement circuit can accurately measure parameters such as phase position of a low frequency scope signal, measuring phase absolute error being no greater than one DEG.
Description
Technical field
The utility model relates to a kind of high-tension switch cabinet phase measuring circuit.
Background technology
In recent years, development along with science and technology, phase measurement is widely used in the fields such as national defence, research and production, many measuring instruments develop to " intelligent instrument " and " Auto-Test System " gradually, also progressively to high precision, high-intelligentization future development, phase measurement has great significance in fields such as electric power, machineries to the requirement of phase measurement.
The utility model content
The purpose of this utility model is to propose a kind of high-tension switch cabinet phase measuring circuit, can carry out accurate phase measurement to the signal of low frequency ranges inside.
To achieve these goals, the utility model adopts following technical scheme:
A kind of high-tension switch cabinet phase measuring circuit, include voltage transformer (VT), shaping circuit, phase discriminator, singlechip controller and display module; At the input end of voltage transformer (VT), be provided with the input of two-way voltage signal, at the output terminal of voltage transformer (VT), be provided with the output of two-way voltage signal; Shaping circuit, comprise for the output terminal of receiver voltage mutual inductor wherein a road voltage signal output the first shaping circuit and for the second shaping circuit of another road voltage signal output of output terminal of receiver voltage mutual inductor, the first shaping circuit is identical with the second shaping circuit structure; Output terminal at the first shaping circuit and the second shaping circuit respectively is provided with a road signal output; Phase discriminator, comprise that the signal output part of phase discriminator is connected on one of them external interrupt control pin of singlechip controller be used to the first signal input end of the output end signal output that receives the first shaping circuit, be used to secondary signal output terminal and a road signal output part that the output end signal that receives the second shaping circuit is exported; Display module is electrically connected on singlechip controller.
Further, described voltage transformer (VT) is provided with two groups, comprise prime voltage transformer (VT) and rear class voltage transformer (VT), the input end of prime voltage transformer (VT) is provided with the input of two-way voltage signal, the output terminal of prime voltage transformer (VT) is connected with the input end of rear class voltage transformer (VT), and the output terminal of rear class voltage transformer (VT) is provided with the output of two-way voltage signal.
Further, described the first shaping circuit, comprise first operational amplifier and first JK flip-flop, a road voltage signal of exporting through the output terminal of voltage transformer (VT) is input on an input end of the first operational amplifier, the output terminal of the first operational amplifier is connected on the clock control end of the first JK flip-flop, and the forward output terminal of the first JK flip-flop is connected on the first signal input end of phase discriminator; Described the second shaping circuit, comprise second operational amplifier and second JK flip-flop, another road voltage signal of exporting through the output terminal of voltage transformer (VT) is input on an input end of the second operational amplifier, the output terminal of the second operational amplifier is connected on the clock control end of the second JK flip-flop, and the forward output terminal of the second JK flip-flop is connected on the secondary signal input end of phase discriminator.
Further, described phase discriminator adopts the version of XOR gate.
Further, described display module adopts charactron to show or liquid crystal display.
The utility model has the advantages that:
The utility model enters shaping circuit by the two-way same frequency to input, the voltage signal of out of phase by two groups of voltage transformer (VT), make voltage signal be converted into square-wave signal, pass through again phase discriminator, obtain the positive pulse width of two-way waveform, the corresponding mistiming of phase differential that namely needs the two-way voltage signal of measuring, signal is transported on an external interrupt control pin of singlechip controller subsequently, through the singlechip controller deal with data, finally obtain the phase value that needs and show by charactron or liquid crystal display pipe.The utility model carries out the isoparametric accurate measurement of phase place to the signal of low frequency ranges, surveys the phase absolute error and is not more than 1 °.Hardware configuration of the present utility model is simple, and software adopts assembly language to realize, program is simple, readability is high, efficiency is high, with traditional Circuits System, compares, and its processing speed is fast, stability is high, cost performance is high.
The accompanying drawing explanation
Fig. 1 is the structured flowchart of the utility model middle-high voltage switch phase measuring circuit;
Fig. 2 is the particular circuit configurations figure of the utility model middle-high voltage switch phase measuring circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail:
In conjunction with Fig. 1, shown in Figure 2, a kind of high-tension switch cabinet phase measuring circuit, include voltage transformer (VT) 1, shaping circuit 2, phase discriminator 3, singlechip controller 4 and display module 5.
Voltage transformer (VT) 1 is provided with two groups, comprise prime voltage transformer (VT) 101 and rear class voltage transformer (VT) 102, the input end of prime voltage transformer (VT) is provided with the input of two-way voltage signal, the output terminal of prime voltage transformer (VT) is connected with the input end of rear class voltage transformer (VT), and the output terminal of rear class voltage transformer (VT) is provided with the output of two-way voltage signal Ua, Ub.Through two groups of voltage transformer (VT), can, by the kilovolt high pressure drop to volt level level, be convenient to voltage signal is transformed and measures.
Concrete, the first shaping circuit, comprise first operational amplifier 201 and first JK flip-flop 203, a road voltage signal Ua who exports through the output terminal of voltage transformer (VT) is input on an input end of the first operational amplifier 201, the output terminal of the first operational amplifier is connected on the clock control end of the first JK flip-flop, and the forward output terminal of the first JK flip-flop is connected on the first signal input end of phase discriminator 3; The second shaping circuit, comprise second operational amplifier 202 and second JK flip-flop 204, another road voltage signal Ub that exports through the output terminal of voltage transformer (VT) is input on an input end of the second operational amplifier, the output terminal of the second operational amplifier is connected on the clock control end of the second JK flip-flop, and the forward output terminal of the second JK flip-flop is connected on the secondary signal input end of phase discriminator.
Phase discriminator 3 adopts the version of XOR gate.Phase discriminator, comprise that the signal output part of phase discriminator is connected on one of them external interrupt control pin INT0 or INT1 of singlechip controller be used to the first signal input end of the output end signal Ue output that receives the first shaping circuit, be used to secondary signal output terminal and a road signal output part Ug that the output end signal Uf that receives the second shaping circuit exports.
As voltage signal Ua, Ub respectively after the first operational amplifier 201, the second operational amplifier 202 zero passage detection, its output signal U c, Ud are respectively by the input end of the first JK flip-flop 203, the second JK flip-flop 204, the output signal U e of two JK flip-flop, Uf are through XOR gate, and the output signal U g of XOR gate be a pulse width to Ua, Ub two signals between the pulse sequence signal that is directly proportional of phase differential, again this pulse sequence signal Ug is sent to single-chip microcomputer external interrupt mouth, carries out the data processing.
Display module 5 adopts charactron to show or liquid crystal display.Display module is comprised of 7 sections LED charactrons of 4 common anode utmost points and 4 shift register 74LS164 chips that seal in/walk abreast.This display mode not only can simply obtain comparatively simple hardware circuit, and can obtain stable data output display, not only takies one-chip machine port few, and can be abundant utilize the serial port resource of singlechip chip inside, simplify software programming.
When Multi-bit LED shows, often the section route selection of all is connected in parallel, by 8 I/O mouth, controlled, and common cathode limit or common anode limit is controlled by another 8 I/O mouths respectively; Also can adopt the parallel-expansion mouth to form display module.Usually, need the more of extended device pin, price is higher.Here we utilize the straightforward procedure that a Parallel I/existing a plurality of LED of O cause for gossip show of single-chip microcomputer.Shown in Fig. 4-11, be the display module circuit theory diagrams of this circuit.Wherein, 74LS164 is 8 bit parallel output gate serial-in shift registers, and LED adopts common anode utmost point charactron.
During demonstration, it shows that data are sent to A, the B end of shift register 74LS164 from P3.0 (RXD) mouthful of output of AT89C51 with serial mode, and the parallel data that then will become is from output terminal Q0～Q7 output.And then the LED section code selection of output is sent to charactron LED1～LED4 simultaneously.
Certainly; above explanation is only preferred embodiment of the present utility model; the utility model is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this instructions; alternative, obvious form of distortion that all that make are equal to, within all dropping on the essential scope of this instructions, ought to be subject to protection of the present utility model.
Claims (5)
1. a high-tension switch cabinet phase measuring circuit, is characterized in that, includes voltage transformer (VT), shaping circuit, phase discriminator, singlechip controller and display module; At the input end of voltage transformer (VT), be provided with the input of two-way voltage signal, at the output terminal of voltage transformer (VT), be provided with the output of two-way voltage signal; Shaping circuit, comprise for the output terminal of receiver voltage mutual inductor wherein a road voltage signal output the first shaping circuit and for the second shaping circuit of another road voltage signal output of output terminal of receiver voltage mutual inductor, the first shaping circuit is identical with the second shaping circuit structure; Output terminal at the first shaping circuit and the second shaping circuit respectively is provided with a road signal output; Phase discriminator, comprise that the signal output part of phase discriminator is connected on one of them external interrupt control pin of singlechip controller be used to the first signal input end of the output end signal output that receives the first shaping circuit, be used to secondary signal output terminal and a road signal output part that the output end signal that receives the second shaping circuit is exported; Display module is electrically connected on singlechip controller.
2. a kind of high-tension switch cabinet phase measuring circuit according to claim 1, it is characterized in that, described voltage transformer (VT) is provided with two groups, comprise prime voltage transformer (VT) and rear class voltage transformer (VT), the input end of prime voltage transformer (VT) is provided with the input of two-way voltage signal, the output terminal of prime voltage transformer (VT) is connected with the input end of rear class voltage transformer (VT), and the output terminal of rear class voltage transformer (VT) is provided with the output of two-way voltage signal.
3. a kind of high-tension switch cabinet phase measuring circuit according to claim 1, it is characterized in that, described the first shaping circuit, comprise first operational amplifier and first JK flip-flop, a road voltage signal of exporting through the output terminal of voltage transformer (VT) is input on an input end of the first operational amplifier, the output terminal of the first operational amplifier is connected on the clock control end of the first JK flip-flop, and the forward output terminal of the first JK flip-flop is connected on the first signal input end of phase discriminator; Described the second shaping circuit, comprise second operational amplifier and second JK flip-flop, another road voltage signal of exporting through the output terminal of voltage transformer (VT) is input on an input end of the second operational amplifier, the output terminal of the second operational amplifier is connected on the clock control end of the second JK flip-flop, and the forward output terminal of the second JK flip-flop is connected on the secondary signal input end of phase discriminator.
4. a kind of high-tension switch cabinet phase measuring circuit according to claim 3, is characterized in that, described phase discriminator adopts the version of XOR gate.
5. a kind of high-tension switch cabinet phase measuring circuit according to claim 1, is characterized in that, described display module adopts charactron to show or liquid crystal display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203916542U CN203299274U (en) | 2013-07-03 | 2013-07-03 | High tension switchgear phase measurement circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203916542U CN203299274U (en) | 2013-07-03 | 2013-07-03 | High tension switchgear phase measurement circuit |
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| CN203299274U true CN203299274U (en) | 2013-11-20 |
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| CN2013203916542U Expired - Fee Related CN203299274U (en) | 2013-07-03 | 2013-07-03 | High tension switchgear phase measurement circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592515A (en) * | 2013-11-21 | 2014-02-19 | 厦门安达兴电气集团有限公司 | Universal phase identifier |
| CN104749436A (en) * | 2015-04-13 | 2015-07-01 | 武汉大学 | Phase measuring instrument |
| CN108008189A (en) * | 2017-12-25 | 2018-05-08 | 黑龙江龙电电气有限公司 | A kind of phase detection device and method |
| CN111751618A (en) * | 2020-07-07 | 2020-10-09 | 广东省计量科学研究院（华南国家计量测试中心） | Voltage and current phase measurement calibration equipment |
-
2013
- 2013-07-03 CN CN2013203916542U patent/CN203299274U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592515A (en) * | 2013-11-21 | 2014-02-19 | 厦门安达兴电气集团有限公司 | Universal phase identifier |
| CN104749436A (en) * | 2015-04-13 | 2015-07-01 | 武汉大学 | Phase measuring instrument |
| CN108008189A (en) * | 2017-12-25 | 2018-05-08 | 黑龙江龙电电气有限公司 | A kind of phase detection device and method |
| CN111751618A (en) * | 2020-07-07 | 2020-10-09 | 广东省计量科学研究院（华南国家计量测试中心） | Voltage and current phase measurement calibration equipment |
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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: 20131120 Termination date: 20140703 |
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| EXPY | Termination of patent right or utility model |