CN213122123U - Three-phase electric detection phase sequence intermediate relay circuit - Google Patents
Three-phase electric detection phase sequence intermediate relay circuit Download PDFInfo
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- CN213122123U CN213122123U CN202020915629.XU CN202020915629U CN213122123U CN 213122123 U CN213122123 U CN 213122123U CN 202020915629 U CN202020915629 U CN 202020915629U CN 213122123 U CN213122123 U CN 213122123U
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Abstract
The utility model discloses a three-phase electricity detects phase sequence auxiliary relay circuit belongs to phase sequence and detects identification circuit technical field. The three-phase mains supply of the three-phase mains supply is connected to the anti-surge protection resistor, the output end of the anti-surge protection resistor is connected with the voltage comparator, the output end of the voltage comparator is connected with the phase sequence judgment module, the output end of the phase sequence judgment module is connected with the relay control signal conduction module, and the relay control signal conduction module is connected to the intermediate relay. The intermediate relay circuit is composed of the surge-proof protection resistor, the voltage comparator, the phase sequence judging module, the relay control signal conducting module, the voltage reducing module, the voltage stabilizing circuit and the intermediate relay to judge whether the phase sequence is normal or not, and the phenomenon that the circuit cannot work normally or even is damaged due to phase loss of a power supply or phase sequence inversion is avoided.
Description
Technical Field
The utility model relates to a three-phase electricity detects phase sequence auxiliary relay circuit belongs to phase sequence and detects identification circuit technical field.
Background
The phase sequence protector is called a phase sequence relay as a control relay, can automatically identify the phase sequence, and avoids accidents or equipment damages caused by motor reversal after the phase sequence of a power supply of some special electromechanical equipment is reversed (three live wires are reversed in sequence).
The existing phase sequence relay has high cost and weak anti-interference capability.
Disclosure of Invention
The utility model discloses the technical problem that will solve lies in: the utility model provides a three-phase electricity detects phase sequence relay circuit, it has solved phase sequence relay cost height among the prior art, and the interference killing feature is relatively weak moreover.
The utility model discloses the technical problem that will solve takes following technical scheme to realize:
a three-phase electric detection phase sequence intermediate relay circuit comprises an anti-surge protection resistor, a voltage comparator, a phase sequence judgment module, a relay control signal conduction module, a voltage reduction module, a voltage stabilizing circuit and an intermediate relay, wherein three mains supplies of a three-phase mains supply are connected to the anti-surge protection resistor, the output end of the anti-surge protection resistor is connected with the voltage comparator, the output end of the voltage comparator is connected with the phase sequence judgment module, the output end of the phase sequence judgment module is connected with the relay control signal conduction module, and the relay control signal conduction module is connected to the intermediate relay; two of the three-phase mains supply are connected to a voltage reduction module, the output end of the voltage reduction module is connected to a voltage stabilizing circuit, and the voltage stabilizing circuit is connected to an intermediate relay;
as a preferred example, the anti-surge protection resistor is a voltage dependent resistor, the voltage comparator is an LM324 voltage comparator, the phase sequence determination module is four sets of xor gate logic chips HEF4070, the voltage reduction module is a safety capacitor, the voltage regulator circuit is a half-wave voltage-stabilizing rectifier bridge circuit, and the relay control signal conduction module is a conduction triode.
As a preferred example, the conducting transistor is a PNP transistor, in which one P terminal is connected to ground and the other P terminal is connected to the coil of the intermediate relay.
The utility model has the advantages that: the intermediate relay circuit is composed of the surge-proof protection resistor, the voltage comparator, the phase sequence judging module, the relay control signal conducting module, the voltage reducing module, the voltage stabilizing circuit and the intermediate relay to judge whether the phase sequence is normal or not, and the phenomenon that the circuit cannot work normally or even is damaged due to phase loss of a power supply or phase sequence inversion is avoided.
Drawings
FIG. 1 is a block diagram of the connection of the modules of the present invention;
FIG. 2 is a schematic circuit diagram of the connection relationship between two P terminals of the PNP type triode;
fig. 3 is a connection block diagram of various elements of the first embodiment of the present invention.
In the figure: the anti-surge protection circuit comprises an anti-surge protection resistor 1, a voltage comparator 2, a phase sequence judging module 3, a relay control signal conducting module 4, a voltage reducing module 5, a voltage stabilizing circuit 6, an intermediate relay 7, a conducting triode VT, a ground wire E and a coil KA.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, the present invention is further explained by combining the following specific drawings.
As shown in fig. 1, a three-phase electric detection phase sequence intermediate relay circuit comprises an anti-surge protection resistor 1, a voltage comparator 2, a phase sequence judgment module 3, a relay control signal conduction module 4, a voltage reduction module 5, a voltage stabilizing circuit 6 and an intermediate relay 7, wherein three mains supplies of a three-phase mains supply are connected to the anti-surge protection resistor 1, the output end of the anti-surge protection resistor 1 is connected with the voltage comparator 2, the output end of the voltage comparator 2 is connected with the phase sequence judgment module 3, the output end of the phase sequence judgment module 3 is connected with the relay control signal conduction module 4, and the relay control signal conduction module 4 is connected to the intermediate relay 7; two of three-phase mains supply are connected to the voltage reduction module 5, the output end of the voltage reduction module 5 is connected to the voltage stabilizing circuit 6, and the voltage stabilizing circuit 6 is connected to the intermediate relay 7;
as shown in fig. 3, the utility model discloses a first embodiment, surge protection resistance 1 adopts piezo-resistor, and voltage comparator 2 adopts LM324 voltage comparator, and phase sequence judgement module 3 adopts four group's exclusive OR gate logic chip HEF4070, and voltage reduction module 5 adopts ann rule electric capacity, and voltage stabilizing circuit 6 adopts half-wave steady voltage rectifier bridge circuit, and relay control signal switches on module 4 and adopts and switch on triode VT.
The conducting transistor VT is a PNP transistor, one of the P terminals is connected to ground, and the other P terminal is connected to the coil KA of the intermediate relay 7.
The working principle is as follows:
on the one hand, two paths of commercial power of the three-phase circuit are firstly reduced in voltage through the voltage reduction module 5 safety capacitor, then are output to the voltage stabilizing circuit 6 half-wave voltage stabilizing rectifier bridge circuit to enable the voltage to be stable, and the stabilized voltage supplies power to the coil KA of the intermediate relay 7.
On the other hand, because the three-phase mains supply uses alternating current, so that impact can be generated to a certain degree, when the three-phase mains supply is used, firstly, the piezoresistor of the anti-surge protection resistor 1 is utilized to absorb surge, namely instantaneous overvoltage exceeding normal working voltage, then, the three-phase voltage output from the piezoresistor is compared through the voltage comparator 2 and the LM324 voltage comparator, and when the voltage of a non-inverting input end (positive end) is higher than the voltage of an inverting input end (negative end), the LM324 voltage comparator outputs high level; otherwise, a low level is output. Then, four groups of exclusive-or gate logic chips HEF4070 of the phase sequence judging module 3 analyze the high level or the low level output by the LM324 voltage comparator, judge whether the phase sequence is normal, input the same signal (all 1 or all 0), output 0, at this time, the phase sequence is normal; when different signals are input, 1 is output, the phase sequence is abnormal, the electric signals output by the four groups of exclusive-or gate logic chips HEF4070 are amplified by conducting the triode VT through the relay control signal conducting module 4, and the triode VT is conducted to output the signals to the coil KA of the intermediate relay 7.
The two conditions control the coil KA output signal of the intermediate relay 7, the phase sequence can be detected, the accuracy of the phase sequence in the circuit is maintained, and therefore the safety of the circuit is protected.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. Without departing from the spirit and scope of the present invention, there are also provided various changes and modifications that fall within the scope of the claimed invention. The scope of the invention is defined by the claims and their equivalents.
Claims (3)
1. A three-phase electric detection phase sequence intermediate relay circuit is characterized by comprising an anti-surge protection resistor, a voltage comparator, a phase sequence judging module, a relay control signal conduction module, a voltage reduction module, a voltage stabilizing circuit and an intermediate relay, wherein three mains supplies of a three-phase mains supply are connected to the anti-surge protection resistor, the output end of the anti-surge protection resistor is connected with the voltage comparator, the output end of the voltage comparator is connected with the phase sequence judging module, the output end of the phase sequence judging module is connected with the relay control signal conduction module, and the relay control signal conduction module is connected to the intermediate relay; two of the three-phase mains supply are connected to the voltage reduction module, the output end of the voltage reduction module is connected to the voltage stabilizing circuit, and the voltage stabilizing circuit is connected to the intermediate relay.
2. The three-phase electric detection phase sequence intermediate relay circuit as claimed in claim 1, wherein the anti-surge protection resistor is a voltage dependent resistor, the voltage comparator is an LM324 voltage comparator, the phase sequence judging module is four sets of XOR gate logic chips HEF4070, the voltage reducing module is an ampere-standard capacitor, the voltage stabilizing circuit is a half-wave voltage stabilizing rectifier bridge circuit, and the relay control signal conducting module is a conducting triode.
3. A three phase current sensing phase sequence intermediate relay circuit as claimed in claim 2 wherein said conducting transistor is a PNP transistor with one P terminal connected to ground and the other P terminal connected to the coil of the intermediate relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020915629.XU CN213122123U (en) | 2020-05-27 | 2020-05-27 | Three-phase electric detection phase sequence intermediate relay circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020915629.XU CN213122123U (en) | 2020-05-27 | 2020-05-27 | Three-phase electric detection phase sequence intermediate relay circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213122123U true CN213122123U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020915629.XU Active CN213122123U (en) | 2020-05-27 | 2020-05-27 | Three-phase electric detection phase sequence intermediate relay circuit |
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| Country | Link |
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| CN (1) | CN213122123U (en) |
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2020
- 2020-05-27 CN CN202020915629.XU patent/CN213122123U/en active Active
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