CN210690685U - Phase difference detection circuit for high-voltage switch equipment nuclear phase test - Google Patents
Phase difference detection circuit for high-voltage switch equipment nuclear phase test Download PDFInfo
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- CN210690685U CN210690685U CN201921072069.XU CN201921072069U CN210690685U CN 210690685 U CN210690685 U CN 210690685U CN 201921072069 U CN201921072069 U CN 201921072069U CN 210690685 U CN210690685 U CN 210690685U
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Abstract
The utility model discloses a phase difference detection circuitry for high tension switchgear nuclear phase is experimental of electric power detection technical field aims at solving among the prior art and carries out the high tension switchgear nuclear phase experiment with the differential method of voltage, and the technical problem that can't accurate judgement is cophase or out-of-phase. The circuit comprises a signal processing circuit, a microprocessor unit, an in-phase indicator lamp and an out-phase indicator lamp, wherein the signal processing circuit comprises a gate circuit phase detection unit and an integration and comparison circuit unit, the output ends of two capacitance sensors in the high-voltage switch device are connected with the input end of the gate circuit phase detection unit, the output end of the gate circuit phase detection unit is connected with the input end of the integration and comparison circuit unit, the output end of the integration and comparison circuit unit is connected with the A/D end of the microprocessor unit, and the output end I/O port of the microprocessor unit is connected with the input end of the in-phase indicator lamp and the input end of the out-phase indicator lamp.
Description
Technical Field
The utility model relates to a phase difference detection circuitry for high tension switchgear nuclear phase test belongs to electric power detection technical field.
Background
At present, the phase checking test for the high-voltage switch cabinet is basically limited to the traditional voltage difference method. The method can accurately check the phase under the condition that the voltages of the two lines are basically the same, namely: the voltage difference is minimal (close to zero) when the phases are the same, and the voltage difference is larger when the phases are the different; however, when the voltages of the two lines are different, the voltage difference is large even in the same phase, and thus it is impossible to accurately determine whether the voltages are in the same phase or out of phase. In practical application, voltage signals acquired by the phase detector come from two capacitance sensors on a high-voltage switch cabinet, capacitance of the capacitance sensors is changed, the coupled voltage values of the capacitance sensors are difficult to be completely the same, and the traditional voltage difference method is adopted to carry out phase detection on a high-voltage line, so that the serious problems of misjudgment and the like can be caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the prior art, provide a phase difference detection circuitry for high tension switchgear nuclear phase test, including signal processing circuit, microprocessor unit, cophase pilot lamp, heterogeneous pilot lamp, signal processing circuit includes gate circuit phase detection unit and total mark and comparison circuit unit, and two electric capacity sensor's in the high tension switchgear output is connected with gate circuit phase detection unit's input, and gate circuit phase detection unit's output is connected with total mark and comparison circuit unit's input, and total mark and comparison circuit unit's output is connected with microprocessor unit's AD end, and microprocessor unit's output IO mouth is connected with cophase pilot lamp's input and heterogeneous pilot lamp's input.
Furthermore, the intelligent control system also comprises two circuit live indicating lamps, and the input ends of the two circuit live indicating lamps are connected with the I/O port of the output end of the microprocessor unit.
The power supply further comprises a power supply and a switch circuit unit, wherein the output end of the power supply is connected with the input end of the switch circuit unit, and the output end of the switch circuit unit is connected with the corresponding power supply end of the microprocessor unit.
Furthermore, the power supply indicating lamp unit is further included, and the input end of the power supply indicating lamp unit is connected with the output end of the switch circuit unit.
Furthermore, the gate circuit phase detection unit comprises two dual-input nand-driver chips and a dual-input nand-gate chip, wherein one input end of the dual-input nand-gate chip is connected with the output end of one of the capacitance sensors, one input end of one of the dual-input nand-driver chips is connected with the output end of the other capacitance sensor, and the output end of the dual-input nand-gate chip is connected with the other input end of the dual-input nand-gate chip; and one input end of the other double-input NAND driving chip is connected with the output end of the double-input NAND driving chip, and the output end of the other double-input NAND driving chip is connected with the input end of the integrating and comparing circuit unit.
Furthermore, the integration and comparison circuit unit comprises a linear comparator, the input end of the linear comparator is connected with the output end of the gate circuit phase detection unit, and the output end of the linear comparator is connected with the A/D end of the microprocessor unit.
Compared with the prior art, the utility model discloses the beneficial effect who reaches: the zero-crossing detection circuit and the waveform conversion circuit are combined, the signal is converted into a rectangular wave, a phase difference pulse signal is obtained according to the two-way rectangular wave signal, and the phase difference can be obtained by measuring the duty ratio of the pulse signal. The detection of the duty ratio is similar to frequency detection, only the high level width of the rectangular wave needs to be detected, and not only is the hardware circuit easy to realize, but also the software algorithm is simple and easy to implement.
Drawings
Fig. 1 is a schematic structural diagram of a phase difference detection circuit for a high-voltage switchgear nuclear phase test according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a gate phase detection unit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of the integrating and comparing circuit unit according to the embodiment of the present invention;
fig. 4 is a schematic diagram of voltage phase difference acquisition in an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, be the embodiment of the utility model provides a phase difference detection circuitry principle structure schematic diagram for high tension switchgear nuclear phase test, including signal processing circuit, microprocessor unit, cophase pilot lamp, heterogeneous pilot lamp, signal processing circuit includes gate circuit phase detection unit and integral and comparison circuit unit, and two electric capacity sensor's in the high tension switchgear output is connected with gate circuit phase detection unit's input, and gate circuit phase detection unit's output is connected with integral and comparison circuit unit's input, and integral and comparison circuit unit's output is connected with microprocessor unit's AD end, and microprocessor unit's output IO mouth is connected with cophase pilot lamp's input and heterogeneous pilot lamp's input.
More specifically, as shown in fig. 2, it is the embodiment of the utility model discloses gate circuit phase detection unit circuit diagram comprises two dual input nand driver chips, a dual input nand driver chip, a diode and resistance and electric capacity, and in this embodiment, the model is CD40107 for the dual input nand driver chip chooses for use, and the model is CD4011 for the dual input nand driver chip chooses for use, and the model is 4018 for the diode chooses for use. One input end of the dual-input NAND gate chip is connected with the output end of one of the capacitance sensors, one input end of one of the dual-input NAND gate chips is connected with the output end of the other capacitance sensor, and the output end of the one of the dual-input NAND gate chips is connected with the other input end of the dual-input NAND gate chip; and one input end of the other double-input NAND driving chip is connected with the output end of the double-input NAND driving chip, and the output end of the other double-input NAND driving chip is connected with the input end of the integrating and comparing circuit unit.
As shown in fig. 3, it is the circuit diagram of the integration and comparison circuit unit according to the embodiment of the present invention, which is composed of a linear comparator, a diode D, a resistor and a capacitor, wherein the linear comparator is selected as MAX 933. The input end of the linear comparator is connected with the output end of the gate circuit phase detection unit through a diode D, and the output end of the linear comparator is connected with the A/D end of the microprocessor unit.
In this embodiment, the gate phase detection unit is essentially a waveform conversion circuit and a zero-crossing detection circuitThe combination of the paths and the signal processing process are as follows: firstly, a waveform conversion circuit converts and processes the waveform of a signal coupled by two capacitive sensors into a rectangular wave signal; then, two paths of rectangular wave signals are input into a zero-crossing detection circuit, and the zero-crossing time t of the two signals is judged1And t2Time difference Δ t to carry out the exclusive or to two way rectangular wave signals and handle, based on exclusive or processing result and time difference Δ t output phase difference pulse signal, pulse signal's pulse width is the phase difference that corresponds promptly, more specifically, as shown in fig. 4, is the utility model provides an embodiment's voltage phase difference obtains principle schematic diagram.
The integrating and comparing circuit unit measures the pulse width of the obtained phase difference pulse signal to obtain the phase difference, and the calculation formula of the phase difference is as follows:
P＝2ΠΔt/T＝2Πτn/T，
in the formula, P is phase difference, pi is circumferential rate, tau is signal sampling period, and n is zero-crossing time t of two signals1And t2The number of sampling points in between, T is the signal period. The method is not only easy to realize hardware circuit, but also simple and easy to operate software algorithm.
As the preferred scheme, still include two circuit live indicator lamps, be circuit 1 live indicator lamp and circuit 2 live indicator lamp respectively, the input of two circuit live indicator lamps all is connected with microprocessor unit's output IO mouth. When the 1# capacitive sensor is switched on, the line 1 electrified indicating lamp is turned on; when the 2# capacitance sensor is switched on, the live indicating lamp of the line 2 is turned on to play a role in monitoring the access state of the high-voltage switch equipment.
The power supply also comprises a power supply and a switch circuit unit, wherein the output end of the power supply is connected with the input end of the switch circuit unit, and the output end of the switch circuit unit is connected with the corresponding power supply end of the microprocessor unit. The switching circuit unit can turn on or off the power input to function as a switching circuit.
Preferably, the power supply control circuit further comprises a power supply indicator light unit, and the input end of the power supply indicator light unit is connected with the output end of the switch circuit unit. When the power input is switched on, the power indicator lamp unit lights up to play a role in monitoring the state of the circuit switch.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (6)
1. The phase difference detection circuit for the high-voltage switch equipment nuclear phase test is characterized by comprising a signal processing circuit, a microprocessor unit, an in-phase indicator lamp and an out-phase indicator lamp, wherein the signal processing circuit comprises a gate circuit phase detection unit and an integration and comparison circuit unit, the output ends of two capacitance sensors in the high-voltage switch equipment are connected with the input end of the gate circuit phase detection unit, the output end of the gate circuit phase detection unit is connected with the input end of the integration and comparison circuit unit, the output end of the integration and comparison circuit unit is connected with the A/D end of the microprocessor unit, and the output end I/O port of the microprocessor unit is connected with the input end of the in-phase indicator lamp and the input end of the out-phase indicator.
2. The phase difference detection circuit for the nuclear phase test of the high-voltage switch equipment as claimed in claim 1, further comprising two line live indicator lamps, wherein the input ends of the two line live indicator lamps are connected with the output end I/O port of the microprocessor unit.
3. The phase difference detection circuit for the high-voltage switchgear nuclear phase test as claimed in claim 1, further comprising a power supply, a switching circuit unit, wherein an output terminal of the power supply is connected to an input terminal of the switching circuit unit, and an output terminal of the switching circuit unit is connected to a corresponding power supply terminal of the microprocessor unit.
4. The phase difference detection circuit for the nuclear phase test of the high-voltage switch equipment as claimed in claim 3, further comprising a power indicator light unit, wherein an input end of the power indicator light unit is connected with an output end of the switch circuit unit.
5. The phase difference detection circuit for the high-voltage switch equipment nuclear phase test is characterized in that the gate circuit phase detection unit comprises two dual-input NAND driver chips and a dual-input NAND gate chip, wherein one input end of the dual-input NAND gate chip is connected with the output end of one capacitor sensor, one input end of the dual-input NAND driver chip is connected with the output end of the other capacitor sensor, and the output end of the dual-input NAND gate chip is connected with the other input end of the dual-input NAND gate chip; and one input end of the other double-input NAND driving chip is connected with the output end of the double-input NAND driving chip, and the output end of the other double-input NAND driving chip is connected with the input end of the integrating and comparing circuit unit.
6. The phase difference detection circuit for the high-voltage switch equipment nuclear phase test according to any one of claims 1 to 4, characterized in that the integration and comparison circuit unit comprises a linear comparator, the input end of the linear comparator is connected with the output end of the gate circuit phase detection unit, and the output end of the linear comparator is connected with the A/D end of the microprocessor unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921072069.XU CN210690685U (en) | 2019-07-10 | 2019-07-10 | Phase difference detection circuit for high-voltage switch equipment nuclear phase test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921072069.XU CN210690685U (en) | 2019-07-10 | 2019-07-10 | Phase difference detection circuit for high-voltage switch equipment nuclear phase test |
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| CN210690685U true CN210690685U (en) | 2020-06-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825560A (en) * | 2023-02-17 | 2023-03-21 | 青岛鼎信通讯股份有限公司 | Intelligent low-voltage power grid phase checking device and method based on frequency tracking technology |
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2019
- 2019-07-10 CN CN201921072069.XU patent/CN210690685U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825560A (en) * | 2023-02-17 | 2023-03-21 | 青岛鼎信通讯股份有限公司 | Intelligent low-voltage power grid phase checking device and method based on frequency tracking technology |
| CN115825560B (en) * | 2023-02-17 | 2023-05-23 | 青岛鼎信通讯股份有限公司 | Intelligent phase checking method of electric power network based on frequency tracking technology |
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