CN106707043B - Three-phase alternating current phase discrimination method and phase discrimination system thereof - Google Patents
Three-phase alternating current phase discrimination method and phase discrimination system thereof Download PDFInfo
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- CN106707043B CN106707043B CN201710069689.7A CN201710069689A CN106707043B CN 106707043 B CN106707043 B CN 106707043B CN 201710069689 A CN201710069689 A CN 201710069689A CN 106707043 B CN106707043 B CN 106707043B
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- G01R29/18—Indicating phase sequence; Indicating synchronism
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Abstract
The application belongs to a phase discrimination method and a phase discrimination system for three-phase alternating current. It has solved the technical problem such as prior art design is unreasonable. The device comprises a first sampling unit, a second sampling unit and a third sampling unit, wherein the first sampling unit is connected with a first zero-crossing detection circuit through a first electric signal processing circuit, the second sampling unit is connected with a second zero-crossing detection circuit through a second electric signal processing circuit, the third sampling unit is connected with a third zero-crossing detection circuit through a third electric signal processing circuit, the first zero-crossing detection circuit, the second zero-crossing detection circuit and the third zero-crossing detection circuit are all connected with a central processor, and the central processor is connected with a memory. The advantages are that: 1. the phase sequence state can be reflected in real time at any time of the power grid period, the phase sequence judgment is timely and effective, and the electricity safety is improved. 2. The phase sequence detection method is simple and practical, and provides rapid and accurate three-phase alternating current phase sequence information for three-phase electric equipment or a three-phase alternating current power supply.
Description
Technical Field
The application belongs to the technical field of electricity, relates to three-phase alternating current, and particularly relates to a three-phase alternating current phase discrimination method and a phase discrimination system thereof.
Background
The phase sequence of the three-phase alternating current has an important influence on the normal operation of electric equipment, and the opposite power supply phase sequence is not allowed to occur in many cases. The three-phase AC power driving device is used as, for example, crane, elevator and other hoisting devices, and the AC motor driven device controls the running direction of the driving device by changing the phase sequence of the power supply voltage of the motor. In normal operation, once the phase sequence is reversed, the running direction will also change, so that phase sequence detection must be introduced in the control of the transmission device, otherwise equipment failure and even personal injury can be caused. Therefore, the correct detection of the three-phase electrical phase sequence is a fundamental requirement of many three-phase electrical equipment.
In the prior art, the circuit structure for phase sequence detection and protection is complex, the manufacturing cost is high, and the safety is poor in practical application. There are two main methods in the existing phase sequence measurement technology: the method comprises the following steps: the unbalanced load is constructed through the phase sequence measuring device, so that the voltages of all phases of the three-phase load of the phase sequence detecting circuit are unbalanced, meanwhile, the magnitude relation of the unbalanced voltages is reflected through the display device, and the magnitude relation of the phase voltages on the two phases of the load is opposite when the phase sequences are different, so that the phase sequence can be judged. This method may cause erroneous judgment when three phases are severely unbalanced. The second method is as follows: alternating scanning each phase at preset time intervals by utilizing the characteristics of the three-phase alternating current instantaneous voltage waveform; the method is based on waveform characteristics, and the quality of the waveform has an influence on the accuracy of a measurement result.
For this reason, long-term searches have been conducted, and various solutions have been proposed. For example, chinese patent literature discloses a three-phase power phase sequence detection and phase failure protection circuit [ application number: 200620045859.5 it includes three-phase circuit processing signal, amplifying signal and triggering signal, in which the three-phase circuit signal processing circuit is a three-phase power supply B, A, C three-phase, respectively passed through diodes D1, D2 and D3 half-wave rectification, then passed through resistors R1, R2 and R3 attenuation, passed through the voltage stabilizing circuit formed from voltage stabilizing tubes D4, D5 and D6 and resistors R4, R5 and R6 to make clipping, and then outputted the pulse signal close to rectangle, and fed into digital integrated IC, and outputted a rectangle negative pulse whose width is about 3MS (50-cycle alternating current), the front edge of rectangle negative pulse is exactly synchronous with zero crossing point of B-phase sine wave, and the negative pulse passed through amplifying circuit triggering circuit to control three-phase load. If the phase sequence is misplaced or the phase is lost, the bidirectional thyristor SCR can not be turned on, the load end is not electrified, and the fault is avoided. The application also discloses a method and a device for judging the phase sequence of the three-phase alternating current [ application number: 02118647.2 according to the rotation direction of the rotation vector angle, the rotation direction of the rotation vector angle is determined by collecting three-phase real-time voltage/current signals, the phase angle difference of the voltage/current rotation vector is calculated, the rotation direction of the rotation vector angle is determined according to the sign of the calculated rotation vector phase angle difference, the rotation direction of the rotation vector angle can be determined by calculating the rotation vector phase angle difference between one mains supply period, the rotation vector angle can be calculated according to an inverse trigonometric function, the image limit value is determined by the polarity of two phase values after coordinate transformation, and accurate and stable data can be obtained after the phase angle difference is subjected to filtering treatment or averaging.
The above scheme realizes phase sequence detection, but still has the technical problems of complex judging process, complex judging circuit, higher cost and the like.
Disclosure of Invention
The application aims to solve the problems and provides a three-phase alternating current phase discrimination system which is easy to realize phase sequence judgment and reasonable in structural design.
The application also aims to provide a three-phase alternating current phase discrimination method with high judgment accuracy and small data calculation amount.
In order to achieve the above purpose, the present application adopts the following technical scheme: the three-phase alternating current phase discrimination system comprises a first sampling unit, a second sampling unit and a third sampling unit, and is characterized in that the first sampling unit is connected with a first zero-crossing detection circuit through a first electric signal processing circuit, the second sampling unit is connected with a second zero-crossing detection circuit through a second electric signal processing circuit, the third sampling unit is connected with a third zero-crossing detection circuit through a third electric signal processing circuit, and the first zero-crossing detection circuit, the second zero-crossing detection circuit and the third zero-crossing detection circuit are all connected with a central processing unit, and the central processing unit is connected with a memory which is pre-stored with fundamental wave data.
In the three-phase alternating current phase discrimination system, the first electric signal processing circuit comprises a first preprocessing circuit and a first wave taking circuit which are sequentially connected, wherein the first preprocessing circuit is connected with the first sampling unit, and the first wave taking circuit is connected with the first zero crossing detection circuit; the second electric signal processing circuit comprises a second preprocessing circuit and a second wave taking circuit which are sequentially connected, the second preprocessing circuit is connected with the second sampling unit, and the second wave taking circuit is connected with the second zero crossing detection circuit; the third electric signal processing circuit comprises a third preprocessing circuit and a third wave-taking circuit which are sequentially connected, the third preprocessing circuit is connected with the third sampling unit, and the third wave-taking circuit is connected with the third zero-crossing detection circuit.
In the three-phase alternating current phase discrimination system, the first sampling unit is a micro-power consumption high-voltage power taking circuit, and the output end of the micro-power consumption high-voltage power taking circuit is connected with the first electric signal processing circuit; the second sampling unit is a micro-power consumption high-voltage power-taking circuit, and the output end of the micro-power consumption high-voltage power-taking circuit is connected with the second electric signal processing circuit; the third sampling unit is a micro-power consumption high-voltage power-taking circuit, and the output end of the micro-power consumption high-voltage power-taking circuit is connected with the third electric signal processing circuit.
In the three-phase alternating current phase discrimination system, the micro-power consumption high-voltage power taking circuit comprises an induction power taking circuit, an operational amplifier circuit and an output circuit; the induction power taking circuit comprises a current transformer CT, a bridge rectifier O1, a capacitor C2, a diode D1 and a resistor R1; the operational amplification circuit comprises a transformer T1, an operational amplifier U1, an inverter U2, a reference voltage chip U3, an N-channel MOS tube Q2, an N-channel MOS tube Q3, a resistor R4, a resistor R5 and a resistor R6, wherein one end of the transformer T1 and one end of the resistor R4 are connected with the cathode of a diode D1, the other end of the transformer T1 and one end of the reference voltage chip U3 are connected with the negative input end of the operational amplifier U1, the other end of the resistor R4 and one end of the resistor R5 are connected with the positive input end of the operational amplifier U1, the other end of the resistor R5 and one end of the resistor R6 are connected with the drain electrode of the N-channel MOS tube Q2, the output end of the operational amplifier U1 is connected with the input end of the inverter U2, the gate electrode of the N-channel MOS tube Q3 is connected with one end of the resistor R3, the source electrode of the N-channel MOS tube Q2 and the other end of the resistor R6 are connected with the other end of the reference voltage chip U3; the output circuit include N channel MOS pipe Q1, resistance R2, resistance R3 and electric capacity C3, operational amplifier circuit have input, ground connection end and output, current transformer CT include mutual inductance coil and two alternating current output that link to each other with mutual inductance coil, bridge rectifier O1 has two alternating current input, a direct current output and ground connection end, two alternating current output of current transformer CT connect bridge rectifier O1's two alternating current input respectively, electric capacity C1's one end, diode D1's positive pole, N channel MOS pipe Q1's drain electrode, electric capacity R2's one end connects bridge rectifier O1's direct current output respectively, diode D1's negative pole, electric capacity C2's one end, electric capacity R1's one end all connects operational amplifier circuit's input, operational amplifier circuit's the other end, electric capacity R3's one end, N channel MOS pipe Q1's grid is connected to the other end of resistance R3, bridge rectifier C3's the other end, electric capacity C3's the other end, bridge rectifier circuit's the other end, the ground connection of C1, electric capacity C1's the other end, the other end of electric capacity of the bridge rectifier circuit, the ground connection of the other end of the electric capacity O1.
In the three-phase alternating current phase discrimination system, the central processing unit is connected with the protector of the electric equipment which can enable the central processing unit to be in a disconnection state when the central processing unit detects phase sequence errors.
In the three-phase alternating current phase discrimination system, the electric equipment protector comprises a microprocessor and a switching circuit connected to the microprocessor, the central processing unit is connected with the microprocessor, and the microprocessor is connected with an overvoltage and undervoltage detection module capable of carrying out overvoltage and undervoltage detection on a three-phase power supply, a three-phase unbalanced detection module capable of carrying out three-phase unbalanced detection on the three-phase power supply and an overcurrent detection module capable of carrying out overcurrent detection on the three-phase power supply, wherein the overvoltage and undervoltage detection module, the three-phase unbalanced detection module and the overcurrent detection module are all connected with the three-phase power supply sampling unit.
In the three-phase alternating current phase discrimination system, the overvoltage and undervoltage detection module is connected with an overvoltage and undervoltage setting unit, the three-phase unbalance detection module is connected with a three-phase unbalance setting unit, and the overcurrent detection module is connected with an overcurrent setting unit.
The three-phase alternating current phase discrimination method based on the three-phase alternating current phase discrimination system is characterized in that if the electric signal acquired by the first sampling unit is in a positive half cycle, the central processing unit judges that the output value of the first zero-crossing detection circuit is 1, and if the electric signal acquired by the first sampling unit is in a negative half cycle, the central processing unit judges that the output value of the first zero-crossing detection circuit is 0; if the electric signal collected by the second sampling unit is in a positive half cycle, the central processing unit judges that the output value of the second zero-crossing detection circuit is 1, and if the electric signal collected by the second sampling unit is in a negative half cycle, the central processing unit judges that the output value of the second zero-crossing detection circuit is 0; if the electric signal collected by the third sampling unit is in a positive half cycle, the central processing unit judges that the output value of the third zero-crossing detection circuit is 1, and if the electric signal collected by the third sampling unit is in a negative half cycle, the central processing unit judges that the output value of the third zero-crossing detection circuit is 0; the central processing unit synchronously takes the output values of the first zero-crossing detection circuit, the second zero-crossing detection circuit and the third zero-crossing detection circuit according to time sequence respectively to obtain a code XYZ consisting of three codes, wherein the three codes in the code XYZ respectively represent the output value X of the first zero-crossing detection circuit, the output value Y of the second zero-crossing detection circuit and the output value Z of the third zero-crossing detection circuit at the same moment, the central processing unit takes three continuous codes according to time sequence, then respectively arranges X in each code according to time sequence and compares the X with fundamental wave data in a memory, arranges Y in each code according to time sequence and compares the Y with the fundamental wave data in the memory, arranges Z in each code according to time sequence and compares the Z with the fundamental wave data in the memory, and judges that the phase sequence is correct if the three codes are identical with the fundamental wave data, otherwise, the phase sequence is wrong.
In the three-phase alternating current phase discrimination system, if the three continuous codes are 110, 101 and 011 respectively, the X in each code is arranged as 110 in time sequence, the Y is arranged as 101 in time sequence, and the Z is arranged as 011 in time sequence, so that the three codes can be matched with fundamental wave data, and the phase sequence is judged to be correct.
In the three-phase alternating current phase discrimination system, if the phase sequence is wrong, the central processing unit sends out an alarm signal.
Compared with the prior art, the three-phase alternating current phase discrimination method and the phase discrimination system thereof have the advantages that: 1. the phase sequence state can be reflected in real time at any time of the power grid period, the phase sequence judgment is timely and effective, and the electricity safety is improved. 2. The phase sequence detection method is simple and practical, and provides rapid and accurate three-phase alternating current phase sequence information for three-phase electric equipment or a three-phase alternating current power supply. 3. The micro-power consumption high-voltage power taking circuit is stable and reliable, and can conveniently obtain the electric power suitable for normal production from the high-voltage equipment in a low-power consumption state.
Drawings
Fig. 1 is a block diagram of the structure provided by the present application.
Fig. 2 is a schematic diagram of a micro-power consumption high-voltage power taking circuit provided by the application.
Fig. 3 is a schematic structural diagram of a protector for electric equipment provided by the application.
In the figure, a first sampling unit 1, a second sampling unit 2, a third sampling unit 3, a first electric signal processing circuit 4, a first preprocessing circuit 41, a first wave taking circuit 42, a first zero-crossing detection circuit 5, a second electric signal processing circuit 6, a second preprocessing circuit 61, a second wave taking circuit 62, a second zero-crossing detection circuit 7, a third electric signal processing circuit 8, a third preprocessing circuit 81, a third wave taking circuit 82, a third zero-crossing detection circuit 9, a central processing unit 10, a memory 11, a consumer protector 12, a microprocessor 13, a switching circuit 14, an overvoltage/undervoltage detection module 15, an undervoltage setting unit 151, a three-phase imbalance detection module 16, a three-phase imbalance setting unit 161, an overcurrent detection module 17, and an overcurrent setting unit 171.
Detailed Description
As shown in fig. 1-3, the three-phase alternating current phase discrimination system comprises a first sampling unit 1, a second sampling unit 2 and a third sampling unit 3, wherein the first sampling unit 1 is connected with a first zero-crossing detection circuit 5 through a first electric signal processing circuit 4, the second sampling unit 2 is connected with a second zero-crossing detection circuit 7 through a second electric signal processing circuit 6, the third sampling unit 3 is connected with a third zero-crossing detection circuit 9 through a third electric signal processing circuit 8, and the first zero-crossing detection circuit 5, the second zero-crossing detection circuit 7 and the third zero-crossing detection circuit 9 are all connected with a central processing unit 10, and the central processing unit 10 is connected with a memory 11 which is pre-stored with fundamental wave data.
Specifically, the first electric signal processing circuit 4 includes a first preprocessing circuit 41 and a first wave-taking circuit 42 that are sequentially connected, the first preprocessing circuit 41 is connected with the first sampling unit 1, and the first wave-taking circuit 42 is connected with the first zero-crossing detection circuit 5; the second electric signal processing circuit 6 comprises a second preprocessing circuit 61 and a second wave-taking circuit 62 which are sequentially connected, the second preprocessing circuit 61 is connected with the second sampling unit 2, and the second wave-taking circuit 62 is connected with the second zero-crossing detection circuit 7; the third electric signal processing circuit 8 comprises a third preprocessing circuit 81 and a third wave taking circuit 82 which are sequentially connected, the third preprocessing circuit 81 is connected with the third sampling unit 3, and the third wave taking circuit 82 is connected with the third zero crossing detection circuit 9. The first preprocessing circuit 41, the second preprocessing circuit 61, and the third preprocessing circuit 81 may process the electric signal using the laplace transform method.
The first sampling unit 1 is a micro-power consumption high-voltage power-taking circuit, and the output end of the micro-power consumption high-voltage power-taking circuit is connected with the first electric signal processing circuit 4; the second sampling unit 2 is a micro-power consumption high-voltage power-taking circuit, and the output end of the micro-power consumption high-voltage power-taking circuit is connected with the second electric signal processing circuit 6; the third sampling unit 3 is a micro-power consumption high-voltage power-taking circuit, and the output end of the micro-power consumption high-voltage power-taking circuit is connected with the third electric signal processing circuit 8. Specifically, the micro-power consumption high-voltage power taking circuit comprises an induction power taking circuit, an operational amplification circuit and an output circuit; the induction power taking circuit comprises a current transformer CT, a bridge rectifier O1, a capacitor C2, a diode D1 and a resistor R1; the operational amplification circuit comprises a transformer T1, an operational amplifier U1, an inverter U2, a reference voltage chip U3, an N-channel MOS tube Q2, an N-channel MOS tube Q3, a resistor R4, a resistor R5 and a resistor R6, wherein one end of the transformer T1 and one end of the resistor R4 are connected with the cathode of a diode D1, the other end of the transformer T1 and one end of the reference voltage chip U3 are connected with the negative input end of the operational amplifier U1, the other end of the resistor R4 and one end of the resistor R5 are connected with the positive input end of the operational amplifier U1, the other end of the resistor R5 and one end of the resistor R6 are connected with the drain electrode of the N-channel MOS tube Q2, the output end of the operational amplifier U1 is connected with the input end of the inverter U2, the gate electrode of the N-channel MOS tube Q3 is connected with one end of the resistor R3, the source electrode of the N-channel MOS tube Q2 and the other end of the resistor R6 are connected with the other end of the reference voltage chip U3; the output circuit include N channel MOS pipe Q1, resistance R2, resistance R3 and electric capacity C3, operational amplifier circuit have input, ground connection end and output, current transformer CT include mutual inductance coil and two alternating current output that link to each other with mutual inductance coil, bridge rectifier O1 has two alternating current input, a direct current output and ground connection end, two alternating current output of current transformer CT connect bridge rectifier O1's two alternating current input respectively, electric capacity C1's one end, diode D1's positive pole, N channel MOS pipe Q1's drain electrode, electric capacity R2's one end connects bridge rectifier O1's direct current output respectively, diode D1's negative pole, electric capacity C2's one end, electric capacity R1's one end all connects operational amplifier circuit's input, operational amplifier circuit's the other end, electric capacity R3's one end, N channel MOS pipe Q1's grid is connected to the other end of resistance R3, bridge rectifier C3's the other end, electric capacity C3's the other end, bridge rectifier circuit's the other end, the ground connection of C1, electric capacity C1's the other end, the other end of electric capacity of the bridge rectifier circuit, the ground connection of the other end of the electric capacity O1.
The central processing unit 10 is connected to a consumer protector 12 which is capable of being put in an off state when the central processing unit 10 detects a phase sequence error. Specifically, the protector 12 for electric equipment comprises a microprocessor 13 and a switch circuit 14 connected to the microprocessor 13, the central processor 10 is connected to the microprocessor 13, the microprocessor 13 is connected with an overvoltage and undervoltage detection module 15 capable of detecting overvoltage and undervoltage of a three-phase power supply, a three-phase unbalanced detection module 16 capable of detecting three-phase unbalance of the three-phase power supply, and an overcurrent detection module 17 capable of detecting overcurrent of the three-phase power supply, and the overvoltage and undervoltage detection module 15, the three-phase unbalanced detection module 16 and the overcurrent detection module 17 are all connected with a three-phase power supply sampling unit 18. It should be noted that the three-phase power supply sampling unit 18 detects a three-phase power supply directly connected to the electric equipment, and the first sampling unit 1, the second sampling unit 2, and the third sampling unit 3 may be a three-phase power supply directly connected to the electric equipment, or may be a three-phase power supply connected to a switch cabinet, where the switch cabinet may be a high, medium, or low voltage switch cabinet. The overvoltage and undervoltage detection module 15 is connected with an overvoltage and undervoltage setting unit 151, the three-phase imbalance detection module 16 is connected with a three-phase imbalance setting unit 161, and the overcurrent detection module 17 is connected with an overcurrent setting unit 171.
In the present application, a first memory capable of storing data of the first zero-crossing detection circuit 5 may be connected between the first zero-crossing detection circuit 5 and the central processing unit 10, a second memory capable of storing data of the second zero-crossing detection circuit 5 may be connected between the second zero-crossing detection circuit 5 and the central processing unit 10, and a third memory capable of storing data of the third zero-crossing detection circuit 5 may be connected between the third zero-crossing detection circuit 5 and the central processing unit 10.
In the embodiment, the overvoltage and undervoltage protection range is 380V-20% or more, U is 380V+10% or less, and the overvoltage and undervoltage protection is triggered when the overvoltage and undervoltage protection range exceeds the range. The unbalance protection range is that when the unbalance degree is more than or equal to 50 percent plus or minus 10, the action time is 2s; three-phase current unbalance= [ (maximum current value-minimum current value)/maximum current value ] ×100%, and when exceeding the above range, unbalance protection is triggered. The phase sequence protection action time is 0.1s.
The three-phase alternating current phase discrimination method based on the three-phase alternating current phase discrimination system is characterized in that if the electric signal acquired by the first sampling unit 1 is in a positive half cycle, the central processing unit 10 judges that the output value of the first zero-crossing detection circuit 5 is 1, and if the electric signal acquired by the first sampling unit 1 is in a negative half cycle, the central processing unit 10 judges that the output value of the first zero-crossing detection circuit 5 is 0; if the electric signal collected by the second sampling unit 2 is in the positive half cycle, the central processing unit 10 judges that the output value of the second zero-crossing detection circuit 7 is 1, and if the electric signal collected by the second sampling unit 2 is in the negative half cycle, the central processing unit 10 judges that the output value of the second zero-crossing detection circuit 7 is 0; if the electric signal collected by the third sampling unit 3 is in the positive half cycle, the central processing unit 10 judges that the output value of the third zero-crossing detection circuit 9 is 1, and if the electric signal collected by the third sampling unit 3 is in the negative half cycle, the central processing unit 10 judges that the output value of the third zero-crossing detection circuit 9 is 0; the central processing unit 10 synchronously takes the output values of the first zero-crossing detection circuit 5, the second zero-crossing detection circuit 7 and the third zero-crossing detection circuit 9 according to time sequence respectively so as to obtain a code XYZ consisting of three codes, wherein the three codes in the code XYZ respectively represent the output value X of the first zero-crossing detection circuit 5, the output value Y of the second zero-crossing detection circuit 7 and the output value Z of the third zero-crossing detection circuit 9 at the same moment, the central processing unit 10 takes three continuous codes according to time sequence, then respectively arranges X in each code according to time sequence and compares the X with fundamental wave data in the memory 11, Y in each code according to time sequence and compares the Y with the fundamental wave data in the memory 11, and Z in each code according to time sequence and compares the Z with the fundamental wave data in the memory 11, if all codes can be matched with the fundamental wave data, the phase sequence is correct, otherwise, the phase sequence is incorrect. If the three consecutive codes are 110, 101 and 011 respectively, X in each code is 110 in time sequence, Y is 101 in time sequence, and Z is 011 in time sequence, they can be matched with the fundamental wave data, and the phase sequence is determined to be correct. If the phase sequence is wrong, the central processing unit 10 sends out an alarm signal. Obviously, based on the arrangement and combination manner, it is also possible to determine that the fundamental wave data is in other combination manners, and in the three consecutive codes, X, Y and Z in each code may be in other combination manners corresponding to the fundamental wave data. And will not be described in detail herein. The fundamental wave data in the present application means data corresponding to three-phase alternating current having a correct phase sequence.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the application. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the application or exceeding the scope of the application as defined in the accompanying claims.
Although terms of the first sampling unit 1, the second sampling unit 2, the third sampling unit 3, the first electric signal processing circuit 4, the first preprocessing circuit 41, the first wave taking circuit 42, the first zero crossing detection circuit 5, the second electric signal processing circuit 6, the second preprocessing circuit 61, the second wave taking circuit 62, the second zero crossing detection circuit 7, the third electric signal processing circuit 8, the third preprocessing circuit 81, the third wave taking circuit 82, the third zero crossing detection circuit 9, the central processing unit 10, the memory 11, the consumer protector 12, the microprocessor 13, the switching circuit 14, the overvoltage/undervoltage detection module 15, the undervoltage setting unit 151, the three-phase imbalance detection module 16, the three-phase imbalance setting unit 161, the overcurrent detection module 17, the overcurrent setting unit 171, and the like are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the application; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present application.
Claims (9)
1. The three-phase alternating current phase discrimination system comprises a first sampling unit (1), a second sampling unit (2) and a third sampling unit (3), and is characterized in that the first sampling unit (1) is connected with a first zero-crossing detection circuit (5) through a first electric signal processing circuit (4), the second sampling unit (2) is connected with a second zero-crossing detection circuit (7) through a second electric signal processing circuit (6), the third sampling unit (3) is connected with a third zero-crossing detection circuit (9) through a third electric signal processing circuit (8), the first zero-crossing detection circuit (5), the second zero-crossing detection circuit (7) and the third zero-crossing detection circuit (9) are all connected with a central processing unit (10), and the central processing unit (10) is connected with a memory (11) which stores fundamental wave data in advance;
if the electric signals acquired by the first sampling unit (1), the second sampling unit (2) and the third sampling unit (3) are in the positive half cycle, the central processing unit (10) judges that the output value is 1 for the zero crossing detection circuit of the corresponding sampling unit; if the electric signals acquired by the first sampling unit (1), the second sampling unit (2) and the third sampling unit (3) are in the negative half cycle, the central processing unit (10) judges that the output value is 0 for the zero crossing detection circuit of the corresponding sampling unit;
the central processing unit (10) respectively and synchronously takes the output values of the first zero-crossing detection circuit (5), the second zero-crossing detection circuit (7) and the third zero-crossing detection circuit (9) according to time sequence to obtain a code XYZ consisting of three codes, wherein the three codes in the code XYZ respectively represent the output value X of the first zero-crossing detection circuit (5), the output value Y of the second zero-crossing detection circuit (7) and the output value Z of the third zero-crossing detection circuit (9) at the same moment;
the CPU (10) takes three continuous codes according to time sequence, then respectively arranges X in each code according to time sequence and compares with fundamental wave data in the memory (11), Y in each code according to time sequence and compares with fundamental wave data in the memory (11), Z in each code according to time sequence and compares with fundamental wave data in the memory (11), if the codes can be matched with the fundamental wave data, the phase sequence is judged to be correct, otherwise, the phase sequence is wrong.
2. The three-phase alternating current phase discrimination system according to claim 1, wherein said first electric signal processing circuit (4) includes a first preprocessing circuit (41) and a first wave-extracting circuit (42) which are sequentially connected, said first preprocessing circuit (41) is connected with a first sampling unit (1), and said first wave-extracting circuit (42) is connected with a first zero-crossing detection circuit (5); the second electric signal processing circuit (6) comprises a second preprocessing circuit (61) and a second wave-taking circuit (62) which are sequentially connected, the second preprocessing circuit (61) is connected with the second sampling unit (2), and the second wave-taking circuit (62) is connected with the second zero-crossing detection circuit (7); the third electric signal processing circuit (8) comprises a third preprocessing circuit (81) and a third wave-taking circuit (82) which are sequentially connected, the third preprocessing circuit (81) is connected with the third sampling unit (3), and the third wave-taking circuit (82) is connected with the third zero-crossing detection circuit (9).
3. The three-phase alternating current phase discrimination system according to claim 1 or 2, wherein said first sampling unit (1) is a micro-power consumption high-voltage power taking circuit, and an output end of the micro-power consumption high-voltage power taking circuit is connected with a first electric signal processing circuit (4); the second sampling unit (2) is a micro-power consumption high-voltage power-taking circuit, and the output end of the micro-power consumption high-voltage power-taking circuit is connected with the second electric signal processing circuit (6); the third sampling unit (3) is a micro-power consumption high-voltage power taking circuit, and the output end of the micro-power consumption high-voltage power taking circuit is connected with the third electric signal processing circuit (8).
4. The three-phase alternating current phase discrimination system according to claim 3, wherein said micro-power consumption high-voltage power taking circuit comprises an induction power taking circuit, an operational amplifier circuit and an output circuit; the induction power taking circuit comprises a current transformer CT, a bridge rectifier O1, a capacitor C2, a diode D1 and a resistor R1; the operational amplification circuit comprises a transformer T1, an operational amplifier U1, an inverter U2, a reference voltage chip U3, an N-channel MOS tube Q2, an N-channel MOS tube Q3, a resistor R4, a resistor R5 and a resistor R6, wherein one end of the transformer T1 and one end of the resistor R4 are connected with the cathode of a diode D1, the other end of the transformer T1 and one end of the reference voltage chip U3 are connected with the negative input end of the operational amplifier U1, the other end of the resistor R4 and one end of the resistor R5 are connected with the positive input end of the operational amplifier U1, the other end of the resistor R5 and one end of the resistor R6 are connected with the drain electrode of the N-channel MOS tube Q2, the output end of the operational amplifier U1 is connected with the input end of the inverter U2, the gate electrode of the N-channel MOS tube Q3 is connected with one end of the resistor R3, the source electrode of the N-channel MOS tube Q2 and the other end of the resistor R6 are connected with the other end of the reference voltage chip U3; the output circuit include N channel MOS pipe Q1, resistance R2, resistance R3 and electric capacity C3, operational amplifier circuit have input, ground connection end and output, current transformer CT include mutual inductance coil and two alternating current output that link to each other with mutual inductance coil, bridge rectifier O1 has two alternating current input, a direct current output and ground connection end, two alternating current output of current transformer CT connect bridge rectifier O1's two alternating current input respectively, electric capacity C1's one end, diode D1's positive pole, N channel MOS pipe Q1's drain electrode, electric capacity R2's one end connects bridge rectifier O1's direct current output respectively, diode D1's negative pole, electric capacity C2's one end, electric capacity R1's one end all connects operational amplifier circuit's input, operational amplifier circuit's the other end, electric capacity R3's one end, N channel MOS pipe Q1's grid is connected to the other end of resistance R3, bridge rectifier C3's the other end, electric capacity C3's the other end, bridge rectifier circuit's the other end, the ground connection of C1, electric capacity C1's the other end, the other end of electric capacity of the bridge rectifier circuit, the ground connection of the other end of the electric capacity O1.
5. The phase-discrimination system of claim 4, wherein said central processing unit (10) is connected to a consumer protector (12) that enables it to be in an off state when a phase sequence error is detected by the central processing unit (10).
6. The three-phase alternating current phase discrimination system according to claim 5, wherein said electric equipment protector (12) includes a microprocessor (13) and a switch circuit (14) connected to the microprocessor (13), said central processing unit (10) is connected to the microprocessor (13), said microprocessor (13) is connected with an overvoltage and undervoltage detection module (15) capable of detecting overvoltage and undervoltage of the three-phase power supply, a three-phase unbalanced detection module (16) capable of detecting three-phase unbalance of the three-phase power supply, an overcurrent detection module (17) capable of detecting overcurrent of the three-phase power supply, said overvoltage and undervoltage detection module (15), said three-phase unbalanced detection module (16) and said overcurrent detection module (17) are all connected to a three-phase power supply sampling unit (18).
7. The three-phase alternating current phase discrimination system according to claim 6, wherein said overvoltage and undervoltage detection module (15) is connected with an overvoltage and undervoltage setting unit (151), said three-phase unbalance detection module (16) is connected with a three-phase unbalance setting unit (161), and said overcurrent detection module (17) is connected with an overcurrent setting unit (171).
8. The three-phase alternating current phase discrimination system according to claim 1, wherein if the consecutive three codes are 110, 101 and 011 respectively, X in each code is arranged in time to 110, y is arranged in time to 101, and z is arranged in time to 011, then both can coincide with the fundamental wave data, and the phase sequence is judged to be correct.
9. The three-phase alternating current phase discrimination system according to claim 1, wherein the central processing unit (10) issues an alarm signal if the phase sequence is wrong.
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