CN210572508U - Universal meter for detecting phase sequence of three-phase power supply - Google Patents
Universal meter for detecting phase sequence of three-phase power supply Download PDFInfo
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- CN210572508U CN210572508U CN201820996883.XU CN201820996883U CN210572508U CN 210572508 U CN210572508 U CN 210572508U CN 201820996883 U CN201820996883 U CN 201820996883U CN 210572508 U CN210572508 U CN 210572508U
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Abstract
The utility model relates to a detect universal meter of three phase current phase sequence, include: the voltage division circuit, the shaping square wave circuit, the acquisition circuit and the processing circuit; the shaping square wave circuit and the acquisition circuit respectively acquire partial voltage signals sent by the voltage division circuit, the shaping square wave circuit and the acquisition circuit are connected with the processing circuit, the acquisition circuit is used for acquiring voltage values and/or frequency values of the partial voltage signals, and the processing circuit acquires the square wave signals of the shaping square wave circuit and the voltage values and frequency values sent by the acquisition circuit and is used for sending locking signals. The utility model discloses in the universal meter pioneering nature of detection three phase current phase sequence adopt two pen-shape metre to detect three phase current phase sequence, test method is simple and wireless artifical judgement and intervention, has practiced thrift individual phase sequence detection device's cost, and the user need not additionally to carry the phase sequence detector again when using, convenience of customers' use.
Description
Technical Field
The utility model belongs to the detection field, concretely relates to detect universal meter of three phase current phase sequence.
Background
In the power system, the stability and the reliability of the network are required to be maintained, and the parallel operation between the networks is required to be avoided. For this reason, the power department specifies four elements that satisfy the parallel operation of the network, namely: equal voltage, equal frequency, identical phase sequence and same phase. Especially, for a motor or the like, since the rotational direction is greatly affected by the phase sequence, if the phase sequence is wrong, the motor is reversed, and therefore, the detection of the phase sequence is necessary. In order to ensure the phase sequence to be consistent, the worker often needs to adopt a three-wire or four-wire ground phase sequence tester to measure the phase sequence of the three-phase power supply, and the carrying is very inconvenient. However, the conventional multimeter and the pincerlike meter are provided with two red and black meter pens, which cannot directly detect the phase sequence of the three-phase power supply, and a scheme for detecting the phase sequence of the three-phase power supply by two lines is needed to meet the requirement of detecting the phase sequence of a three-phase motor or a motor.
SUMMERY OF THE UTILITY MODEL
To the problem, the utility model aims at providing a detect universal meter of three phase current phase sequence for solve among the prior art unable universal meter or the problem that the pincerlike meter measured three phase current phase sequence through two pen-shape meters.
In order to achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a detect universal meter of three phase current phase sequence, include: the device comprises a shaping square wave circuit, an acquisition circuit and a processing circuit; the shaping square wave circuit and the collecting circuit are connected with the processing circuit, the collecting circuit is used for collecting a voltage value and/or a frequency value of a voltage signal, and the processing circuit is used for obtaining the square wave signal of the shaping square wave circuit and the voltage value and the frequency value sent by the collecting circuit and sending a locking signal.
Above-mentioned universal meter of detecting three-phase power phase sequence, it is preferred, still include: and the voltage signal of the voltage division circuit is respectively sent to the shaping square wave circuit and the acquisition circuit after passing through the voltage division circuit.
Above-mentioned universal meter of detecting three-phase power phase sequence, it is preferred, still include: and the timer is connected with the processing circuit and used for timing the output of the shaping square wave circuit according to the voltage signal, and the processing circuit is also used for sending a starting signal and/or an interrupt signal to the timer.
Above-mentioned universal meter of detecting three-phase power phase sequence, it is preferred, still include: and the display unit is connected with the processing circuit and used for displaying the locking signal and the locking result.
Above-mentioned universal meter of detecting three-phase power phase sequence, it is preferred, still include: and the serial port communication module is used for receiving and transmitting data between the display unit and the processing circuit.
Above-mentioned universal meter of detecting three-phase power phase sequence, it is preferred, still include: the three-phase power supply comprises a black meter pen and a red meter pen, wherein the black meter pen is fixedly connected with one phase of the three-phase power supply, and the red meter pen is sequentially connected with the other two phases of the three-phase power supply.
Above-mentioned universal meter of detecting three-phase power phase sequence, it is preferred, still include: and a memory cell for storing a threshold voltage.
Above-mentioned universal meter of detecting three-phase power phase sequence, it is preferred, still include: and the comparison circuit is used for comparing the threshold voltage with the voltage value sent by the acquisition circuit.
The utility model provides a detect universal meter pioneering nature of three phase current phase sequence adopt two pen-shape metre to detect three phase current phase sequence, and test method is simple and wireless artifical judgement and intervention, has practiced thrift independent phase sequence detection device's cost, and the user need not additionally to carry the phase sequence detector again when using, convenience of customers' use.
Drawings
FIG. 1 is a schematic circuit diagram of a multimeter for detecting phase sequence of a three-phase power supply according to an embodiment of the present invention;
FIG. 2A is a schematic diagram of a multimeter for detecting a phase sequence of a three-phase power supply according to an embodiment of the present invention;
fig. 2B is a schematic diagram of a clamp meter for detecting a phase sequence of a three-phase power supply according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting a phase sequence of a three-phase power supply according to an embodiment of the invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
The embodiment of the utility model provides an in detect universal meter of three phase current phase sequence, include: the device comprises a shaping square wave circuit, an acquisition circuit and a processing circuit; the shaping square wave circuit and the collecting circuit are connected with the processing circuit, the collecting circuit is used for collecting a voltage value and/or a frequency value of a voltage signal, and the processing circuit is used for obtaining the square wave signal of the shaping square wave circuit and the voltage value and the frequency value sent by the collecting circuit and sending a locking signal.
Preferably, the embodiment of the utility model provides a detect universal meter of three phase current phase sequence still include: and the voltage signal of the voltage division circuit is respectively sent to the shaping square wave circuit and the acquisition circuit after passing through the voltage division circuit. As shown in fig. 1, the method includes: a voltage division circuit 101, a shaping square wave circuit 102, an acquisition circuit 103 and a processing circuit 104; the shaping square wave circuit 102 and the collecting circuit 103 respectively obtain partial voltage signals sent by the voltage dividing circuit 101, the shaping square wave circuit 102 and the collecting circuit 103 are connected to the processing circuit 104, the collecting circuit 103 is used for collecting voltage values and/or frequency values of the partial voltage signals, and the processing circuit 104 obtains the square wave signals of the shaping square wave circuit and the voltage values and frequency values sent by the collecting circuit and is used for sending locking signals. Specifically, when the device starts phase sequence discrimination detection, the obtained voltage between two phases L1 and L3 in three-phase power supplies L1, L2 and L3 is divided by a voltage dividing circuit 101, one of the two phases is input to a shaping square wave circuit 102 and then outputs a zero-crossing shaped square wave, the other phase is input to an acquisition circuit 103, and the acquisition circuit 103 acquires a voltage value and a frequency value and sends the voltage value and the frequency value to a processing circuit 104. The processing circuit 104 reads the voltage value and confirms whether to send a lock signal according to the voltage value. In a specific embodiment, when the processing circuit 104 reads that the voltage value is greater than 80V, it may be determined that the connection between two phases is valid, and at this time, a lock signal may be sent, which means that the voltage between L2 and L3 may be measured, at this time, the voltage dividing circuit 101 divides the voltage between L2 and L3, one of the voltages is input to the square wave shaping circuit 102 and then outputs a zero-cross shaped square wave, the other is input to the acquisition circuit 103, and the acquisition circuit 103 acquires the voltage value and the frequency value and sends the voltage value and the frequency value to the processing circuit 104. The processing circuit 104 reads the voltage value and determines whether to obtain the level output by the square wave shaping circuit 102 according to the voltage value, and finally, the phase sequence of the three-phase power supply can be determined according to the level output by the square wave shaping circuit 102. When the voltage value read by the processing circuit twice is less than 80V, the processing circuit 104 waits until the suitable voltage value is obtained, and is not triggered. The utility model discloses in the embodiment of preferred, the universal meter can be replaced by pincerlike table or other similar pen-shape meters, its implementation mode with the utility model discloses similar, the event the embodiment of the utility model discloses no longer describe.
Through the embodiment of the utility model provides a detect universal meter of three phase current phase sequence, can only just can measure three phase current's phase sequence through two pens, the measuring method is simple and convenient effective, satisfies the demand that three phase motor or motor detected.
The utility model discloses detect universal meter of three phase current phase sequence in the embodiment, the preferred still includes: and the timer is connected with the processing circuit and used for timing the output of the shaping square wave circuit according to the voltage signal, and the processing circuit is also used for sending a starting signal and/or an interrupt signal to the timer. Specifically, when measuring the voltage between the three-phase power sources L1 and L3, the processing circuit 104 captures the zero-shaped square wave output by the shaped square wave circuit 102, and when the rising edge of the square wave arrives, the processing circuit 104 sends a start signal to a timer to start the timer, wherein the timing period of the timer is the reciprocal of the frequency value acquired by the acquisition circuit 103. When measuring the voltage between L2 and L3, the voltage value of the signal output by the voltage divider circuit 101 is again detected, and when this voltage value >80V, the processing circuit 104 sends an interrupt signal to the timer, at which time the processing circuit 104 reads the output level of the shaped square wave circuit 102. When the output level is low level, the test result is indicated to be positive sequence; if the output level is high, it indicates that the test results are in reverse order, and when the test succeeds to confirm the phase sequence, the processing circuit 104 locks the test results, and if the test is performed again, the above circuits need to be restarted.
The utility model discloses detect universal meter of three phase current phase sequence in the embodiment, the preferred still includes: and the display unit is connected with the processing circuit and used for displaying the locking signal and the locking result. Preferably, the display unit can be replaced by a display screen of the multimeter without additionally adding a display device. Preferably, the multimeter further comprises: and the serial port communication module is used for receiving and transmitting data between the display unit and the processing circuit.
The utility model discloses detect universal meter of three phase current phase sequence in the embodiment, the preferred, as shown in FIG. 2A, still include: the three-phase power supply comprises a black meter pen and a red meter pen, wherein the black meter pen is fixedly connected with one phase of the three-phase power supply, and the red meter pen is sequentially connected with the other two phases of the three-phase power supply. Specifically, a black meter pen is fixed at L3 of a three-phase power supply, and a red meter pen is connected with L1 for the first time; when the L1 is judged to be valid for the connection of L3, the red pen is connected with L2. When replacing the multimeter with a pincer meter, see FIG. 2B.
The utility model discloses detect universal meter of three phase current phase sequence in the embodiment, the preferred still includes: and a memory cell for storing a threshold voltage.
The utility model discloses detect universal meter of three phase current phase sequence in the embodiment, the preferred still includes: and the comparison circuit is used for comparing the threshold voltage with the voltage value sent by the acquisition circuit.
The embodiment of the utility model provides a still provide a method for detecting three-phase power phase sequence, as shown in FIG. 3, the method includes:
301, acquiring a first voltage between a first phase and a third phase in a three-phase power supply; preferably, a first voltage between the first phase and the third phase is acquired by two styluses of the multimeter.
The utility model discloses in the embodiment of preferred, be greater than 80V when judging first partial voltage, acquire before the second voltage between second phase and the third phase among the three phase current, still need send locking signal, it is effective to show the connection, and it is right according to locking signal second voltage between second phase and the third phase among the three phase current measures.
The embodiment of the utility model provides a detect method of three-phase power phase sequence, it is preferred, the method further includes: and when the third partial voltage is greater than the threshold voltage, starting an interrupt response to the output of the shaping square wave circuit, and reading the current output level of the shaping square wave circuit. Preferably, the output of the shaping square wave circuit is circularly timed according to the frequency value of the first divided voltage, and the timed period is the reciprocal of the frequency value, and at this time, the output of the shaping square wave circuit is always in the circular timing without generating interruption; and when the third partial voltage is judged to be greater than the threshold voltage, starting an interruption response and reading whether the current output level of the shaping square wave circuit is a high level or a low level when the interruption occurs, finally determining the phase sequence of the three-phase power supply and locking the test result.
The embodiment of the utility model provides a detect method of three-phase power phase sequence, the preferred, according to the frequency value is to shaping square wave circuit's output open cycle timing further includes:
when the output of the shaping square wave circuit is a rising edge, timing is started; wherein the timing period is the inverse of the frequency value.
To sum up, the embodiment of the utility model provides an in the universal meter pioneering nature of detection three phase current phase sequence adopt two pen-shape metre to detect three phase current phase sequence, test method is simple and wireless artifical judgement and intervention, has practiced thrift independent phase sequence detection device's cost, and the user need not additionally to carry the phase sequence detector again when using, convenience of customers's use.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.
Claims (5)
1. A multimeter for detecting phase sequence of a three-phase power supply, comprising: the device comprises a shaping square wave circuit, an acquisition circuit and a processing circuit; the shaping square wave circuit and the acquisition circuit are connected with the processing circuit, the acquisition circuit is used for acquiring a voltage value and/or a frequency value of a voltage signal, and the processing circuit acquires the square wave signal of the shaping square wave circuit and the voltage value and the frequency value sent by the acquisition circuit and is used for sending a locking signal; the multimeter further comprises: the three-phase power supply comprises a black meter pen and a red meter pen, wherein the black meter pen is fixedly connected with one phase of the three-phase power supply, and the red meter pen is sequentially connected with the other two phases of the three-phase power supply; the multimeter further comprises: the voltage division circuit is used for respectively sending voltage signals to the shaping square wave circuit and the acquisition circuit after the voltage signals pass through the voltage division circuit; and the timer is connected with the processing circuit and used for timing the output of the shaping square wave circuit according to the voltage signal, and the processing circuit is also used for sending a starting signal and/or an interrupt signal to the timer, so that the timing period of the timer is the reciprocal of the frequency value acquired by the acquisition circuit.
2. The multimeter of claim 1, further comprising: and the display unit is connected with the processing circuit and used for displaying the locking signal and the locking result.
3. The multimeter of claim 2, further comprising: and the serial port communication module is used for receiving and transmitting data between the display unit and the processing circuit.
4. The multimeter of claim 1, further comprising: and a memory cell for storing a threshold voltage.
5. The multimeter of claim 4, further comprising: and the comparison circuit is used for comparing the threshold voltage with the voltage value sent by the acquisition circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820996883.XU CN210572508U (en) | 2018-06-27 | 2018-06-27 | Universal meter for detecting phase sequence of three-phase power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820996883.XU CN210572508U (en) | 2018-06-27 | 2018-06-27 | Universal meter for detecting phase sequence of three-phase power supply |
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| Publication Number | Publication Date |
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| CN210572508U true CN210572508U (en) | 2020-05-19 |
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| CN201820996883.XU Active CN210572508U (en) | 2018-06-27 | 2018-06-27 | Universal meter for detecting phase sequence of three-phase power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562803A (en) * | 2018-06-27 | 2018-09-21 | 优利德科技(中国)股份有限公司 | A kind of multimeter and method of detection three-phase power supply phase sequence |
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2018
- 2018-06-27 CN CN201820996883.XU patent/CN210572508U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562803A (en) * | 2018-06-27 | 2018-09-21 | 优利德科技(中国)股份有限公司 | A kind of multimeter and method of detection three-phase power supply phase sequence |
| CN108562803B (en) * | 2018-06-27 | 2024-06-21 | 优利德科技(中国)股份有限公司 | Universal meter and method for detecting phase sequence of three-phase power supply |
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