CN113970357A - Power switch cabinet detection circuit based on Internet of things - Google Patents
Power switch cabinet detection circuit based on Internet of things Download PDFInfo
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- CN113970357A CN113970357A CN202111441836.1A CN202111441836A CN113970357A CN 113970357 A CN113970357 A CN 113970357A CN 202111441836 A CN202111441836 A CN 202111441836A CN 113970357 A CN113970357 A CN 113970357A
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a power switch cabinet detection circuit based on the Internet of things, which effectively solves the problem that the function of an alternating current contactor is influenced by the arrangement of a sensor of the alternating current contactor in the prior art, the sound calculation circuit utilizes a sound signal of an electromagnet of the alternating current contactor, which is acquired by a microphone M1, and the sound signal is processed to obtain a noise signal, the voltage signal provided by the power supply of the AC contactor is transmitted to the voltage processing circuit by the noise signal, and simultaneously transmitting the noise signal to a voltage processing circuit, wherein the voltage processing circuit calculates the voltage signal to obtain a difference signal and judges the difference signal, and then, the voltage signal is calculated again, the noise signal is judged in a delayed manner, and finally, an alarm signal is output to a control center, so that the normal work and the safe use of the power switch cabinet are ensured.
Description
Technical Field
The invention relates to the field of detection of the Internet of things, in particular to a power switch cabinet detection circuit based on the Internet of things.
Background
The alternating current contactor serves as an important component of the power switch cabinet, the safety of the alternating current contactor is closely related to the normal use of the power switch cabinet, so that when an electric power company uses the Internet of things to detect the power switch cabinet, a sensor is arranged to detect the alternating current contactor, detected signals are transmitted to a control center to be analyzed, and therefore the states of the power switch cabinet and the alternating current contactor are closely monitored, and a good effect is achieved.
The power company sets up multiple sensors to the power switch cabinet, such as temperature sensor, smell sensor, humidity transducer etc., but when setting up the sensor to ac contactor, because the ac contactor that temperature reason and voltage reason caused takes place trouble more, set up temperature sensor and voltage sensor to ac contactor, and the noise that ac contactor's electro-magnet sent is big does not make power switch cabinet appear serious trouble and does not set up the noise sensor yet, but ac contactor's electro-magnet sends the noise always and also can cause the influence to ac contactor's function, in the long run past, also can influence the safe handling of power switch cabinet.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a power switch cabinet detection circuit based on the Internet of things, and effectively solves the problem that the function of an alternating current contactor is influenced by the arrangement of a sensor of the alternating current contactor in the prior art.
The technical scheme of its solution is, a power switch cabinet detection circuitry based on thing networking, detection circuitry includes sound calculation circuit and voltage processing circuit, sound calculation circuit utilizes the sound signal of the alternating current contactor's that microphone M1 gathered electro-magnet to obtain noise signal after handling sound signal, utilize the voltage signal transmission that noise signal provided alternating current contactor's power to voltage processing circuit, and transmit noise signal to voltage processing circuit simultaneously, voltage processing circuit obtains the difference signal after operating voltage signal, and judges the difference signal, then operates voltage signal once more, and the time delay is judged noise signal, finally outputs alarm signal to control center.
Furthermore, the sound calculation circuit uses the sound signal of the electromagnet of the ac contactor collected by the microphone M1, and multiplies and filters the sound signal to obtain a noise signal, and uses the noise signal to transmit the voltage signal provided by the power supply of the ac contactor to the voltage processing circuit, and simultaneously transmits the noise signal to the voltage processing circuit.
Furthermore, the voice calculation circuit includes a microphone M1, one end of the microphone M1 is connected to one end of a resistor R1, one end of a resistor R11, and a pin 1 of a multiplier V2, a pin 2 of the multiplier V2 is connected to one end of a resistor R3, the other end of the resistor R1 is connected to the other end of a resistor R3, the collector of the transistor Q2, one end of a resistor R10, one end of a resistor R13, and the collector of the transistor Q3 and is connected to a positive power source VCC, an output end of a multiplier V1 is connected to one end of a resistor R6, the other end of the resistor R6 is connected to one end of a capacitor C6 and one end of a resistor R6, the other end of the resistor R6 is connected to one end of a capacitor C6 and the same phase end of an operational amplifier U2 6, inverting ends of the operational amplifier U2 6 are connected to one end of a resistor R6 and one end of a resistor R6, and the other end of the amplifier R6 are connected to one end of the resistor R6, A base electrode of a triode Q2, an emitter electrode of a triode Q2 are respectively connected with one end of a resistor R9 and an anode of a diode D2, a cathode of the diode D2 is connected with one end of a relay K2, one end of a switch S2 is connected with a voltage signal, the other end of a switch S2 is connected with the right end of a rectifier D1, the upper end of a rectifier D1 is respectively connected with one end of a capacitor C6 and one end of a resistor R14 and is connected with the ground in parallel, the lower end of the rectifier D1 is respectively connected with one end of a resistor R12 and the other end of a capacitor C6, the other end of the resistor R12 is respectively connected with the other end of a resistor R13, a base electrode of the triode Q3, and an emitter electrode of the triode Q3 is connected with the other end of a resistor R14, the left end of the rectifier D1 is connected to the other end of the relay K2, the other end of the resistor R9, the other end of the resistor R8, the other end of the capacitor C3, the other end of the capacitor C5, the other end of the resistor R11 and the other end of the microphone M1, and is connected to ground in parallel.
Further, the voltage processing circuit comprises a calculator and a judger, wherein the calculator subtracts the voltage signal output by the sound calculation circuit to obtain a difference signal, judges the difference signal to start the judger, the judger adds the voltage signal, then delays to start the judgment of the noise signal, and finally outputs an alarm signal to the control center.
Further, the calculator comprises a resistor R15, one end of the resistor R15 is connected with an emitter of a triode Q3 in the sound calculation circuit, the other end of the resistor R15 is respectively connected with one end of a resistor R16 and a non-inverting end of an operational amplifier U3B, an inverting end of the operational amplifier U3B is respectively connected with one end of a resistor R18 and one end of a resistor R17, an output end of the operational amplifier U3B is respectively connected with the other end of a resistor R17 and one end of a resistor R19, the other end of the resistor R19 is connected with an inverting end of an operational amplifier U5B, an output end of the operational amplifier U5B is respectively connected with an anode of a diode D5, a base of a triode Q4 and one end of a resistor R26, an emitter of a triode Q4 is respectively connected with the other end of a resistor R26, the other end of a resistor R18, a collector of a triode Q3 in the sound calculation circuit, one end of a resistor R13 is connected with a positive power supply, and a collector of a triode Q4 is connected with a collector of a resistor R25, the other end of the resistor R25 is connected with the inverting terminal of the operational amplifier U5B, the other end of the resistor R26, one end of the capacitor C7 and one end of the resistor R14 in the sound calculating circuit respectively and connected in parallel with the ground, the cathode of the diode D5 is connected with the control electrode of the thyristor Q6 and the other end of the capacitor C7 respectively, the anode of the thyristor Q6 is connected with the cathode of the diode D2 in the sound calculating circuit, and the cathode of the thyristor Q6 is connected with the control center.
Further, the determiner includes a diode D3, the anode of the diode D3 is connected to the collector of a transistor Q4 in the calculator, the cathode of the diode D3 is connected to one end of a capacitor C8 and the control electrode of a thyristor Q5, the anode of the thyristor Q5 is connected to the output terminal of an operational amplifier U3B in the calculator, the cathode of the thyristor Q5 is connected to one end of a resistor R23, the other end of the resistor R23 is connected to one end of a resistor R24 and the non-inverting end of the operational amplifier U4B, the other end of the resistor R24 is connected to one end of a resistor R15 in the calculator and the emitter of a transistor Q3 in the voice calculating circuit, the inverting end of the operational amplifier U4B is connected to one end of a resistor R22 and one end of a resistor R21, the output terminal of the operational amplifier U4B is connected to the power receiving terminal and one end of a resistor R20, the other end of the resistor R20 is connected to one end of a capacitor C1 and one end of a relay K1, and the emitter of a switch S1 is connected to the emitter 2 in the voice calculating circuit, the other end of the switch S1 is connected to the anode of the diode D4, one end of the resistor R27, the base of the transistor Q1, the anode of the thyristor Q6 in the calculator, the cathode of the diode D4 is connected to one end of the capacitor C2 and the control electrode of the thyristor Q6 in the calculator, the emitter of the transistor Q1 is connected to the other end of the resistor R27, the other end of the resistor R26 in the calculator, the collector of the transistor Q3 in the voice calculation circuit is connected to the positive power VCC, the collector of the transistor Q1 is connected to one end of the resistor R28, the other end of the resistor R28 is connected to the other end of the capacitor C2, the other end of the relay K1, the other end of the capacitor C1, the other end of the resistor R22, the other end of the capacitor C8, the other end of the resistor R25 in the calculator, and one end of the resistor R14 in the voice calculation circuit.
The invention realizes the following beneficial effects:
utilize sound calculating circuit to gather the sound signal that ac contactor sent at the during operation, and utilize sound signal to obtain the noise signal, and utilize the noise signal to begin to receive the voltage signal that the power provided for ac contactor, and utilize voltage processing circuit to calculate and judge voltage signal, whether the final electro-magnet that obtains ac contactor sends the noise because the voltage that the power provided is not enough causes, and when the voltage that ac contactor received the power and provided was not enough, compensate for ac contactor's voltage signal, avoid the production of noise, also avoid long this past to produce great influence to ac contactor's function, avoid influencing the normal work and the safe handling of power switch cabinet.
Drawings
Fig. 1 is a schematic diagram of a voice calculation circuit of the present invention.
Fig. 2 is a schematic diagram of a voltage processing circuit of the present invention.
Detailed Description
The foregoing and other technical and functional aspects of the present invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying figures 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides an electric power switch cabinet detection circuitry based on thing networking is used on electric power switch cabinet's ac contactor, detection circuitry includes sound calculation circuit and voltage processing circuit, sound calculation circuit utilizes the sound signal of microphone M1 collection's ac contactor's electromagnet to obtain the noise signal after handling the sound signal, utilize the voltage signal transmission that the noise signal provided ac contactor's power to voltage processing circuit, and transmit the noise signal to voltage processing circuit simultaneously, voltage processing circuit obtains the difference signal after operating voltage signal, and judges the difference signal, then operates voltage signal once more, and the time delay is judged the noise signal, at last output alarm signal to control center.
The voice calculation circuit comprises a microphone M1, wherein one end of a microphone M1 is respectively connected with one end of a resistor R1, one end of a resistor R11 and a pin 1 of a multiplier V2, a pin 2 of a multiplier V2 is connected with one end of a resistor R3, the other end of the resistor R1 is respectively connected with the other end of the resistor R3, a collector of a triode Q2, one end of the resistor R10, one end of a resistor R13 and a collector of the triode Q3 are connected with a positive power supply VCC, an output end of a multiplier V1 is connected with one end of a resistor R6, the other end of the resistor R6 is respectively connected with one end of a capacitor C3 and one end of a resistor R7, the other end of the resistor R7 is respectively connected with one end of a capacitor C5 and the same-phase end of an operational amplifier U2B, an inverting end of the operational amplifier U2B is respectively connected with one end of a resistor R8 and one end of a resistor R5, an output end of the operational amplifier U2B is connected with one end of a resistor R4, and the other end of the resistor R4 is respectively connected with one end of the resistor R59 10, A base electrode of a triode Q2, an emitter electrode of a triode Q2 are respectively connected with one end of a resistor R9 and an anode of a diode D2, a cathode of the diode D2 is connected with one end of a relay K2, one end of a switch S2 is connected with a voltage signal, the other end of a switch S2 is connected with the right end of a rectifier D1, the upper end of a rectifier D1 is respectively connected with one end of a capacitor C6 and one end of a resistor R14 and is connected with the ground in parallel, the lower end of the rectifier D1 is respectively connected with one end of a resistor R12 and the other end of a capacitor C6, the other end of the resistor R12 is respectively connected with the other end of a resistor R13, a base electrode of the triode Q3, and an emitter electrode of the triode Q3 is connected with the other end of a resistor R14, the left end of the rectifier D1 is connected with the other end of the relay K2, the other end of the resistor R9, the other end of the resistor R8, the other end of the capacitor C3, the other end of the capacitor C5, the other end of the resistor R11 and the other end of the microphone M1 in parallel and connected with the ground;
the sound calculation circuit utilizes the sound signal of the electromagnet of the AC contactor collected by the microphone M1, the sound signal output by the microphone M1 is output to a multiplier V2, and is multiplied with the normal sound signal of the electromagnet of the AC contactor provided by a resistor R3 when the electromagnet is normal, so as to obtain the frequency difference signal and the frequency sum signal of the sound signal and the normal sound signal, low-pass filtering is carried out by a low-pass filter composed of a resistor R6, a capacitor C3, a resistor R7 and a capacitor C5, so as to obtain the frequency difference signal, the frequency difference signal is the noise signal, namely the noise signal is generated when the electromagnet of the AC contactor works, the Q value of the low-pass filter composed of the resistor R6, the capacitor C3, the resistor R7 and the capacitor C5 is increased by an operational amplifier U2B, the loss caused when the low-pass filtering is carried out is reduced, the conduction loss of the noise signal is reduced by a triode Q2, further, the loss of noise signals is reduced, the noise signals are conducted through a diode D2, the relay K2 is transmitted to a voltage processing circuit, a switch S2 is closed after a relay K2 is conducted, voltage signals provided by a power supply of an alternating current contactor and detected by any voltage sensor which outputs analog voltage signals in the prior art are transmitted to a rectifier D1 to be converted, the voltage signals detected by the voltage sensor are the prior art, and the description is omitted herein, the rectifier D1 converts the voltage signals from an alternating current state to a direct current state, a resistor R12 transmits the voltage signals to a triode Q3 to improve the response capability of the voltage signals, and the triode Q3 transmits the voltage signals to the voltage processing circuit.
The calculator comprises a resistor R15, one end of the resistor R15 is connected with an emitter of a triode Q3 in the sound calculation circuit, the other end of the resistor R15 is respectively connected with one end of a resistor R16 and the same-phase end of an operational amplifier U3B, the inverting end of the operational amplifier U3B is respectively connected with one end of a resistor R18 and one end of a resistor R17, the output end of the operational amplifier U3B is respectively connected with the other end of a resistor R17 and one end of a resistor R19, the other end of the resistor R19 is connected with the inverting end of an operational amplifier U5B, the output end of the operational amplifier U5B is respectively connected with the anode of a diode D5, the base of a triode Q4 and one end of a resistor R26, the emitter of the triode Q4 is respectively connected with the other end of the resistor R4 and the collector of the triode Q4 in the sound calculation circuit, one end of the resistor R4 is connected with a positive power supply, the VCC of the triode Q4 is connected with one end of the resistor R4, and the other end of the inverting end of the operational amplifier U4 is respectively connected with the inverting end of the amplifier U4, The other end of the resistor R26, one end of the capacitor C7 and one end of the resistor R14 in the sound calculation circuit are connected in parallel and grounded, the cathode of the diode D5 is respectively connected with the control electrode of the thyristor Q6 and the other end of the capacitor C7, the anode of the thyristor Q6 is connected with the cathode of the diode D2 in the sound calculation circuit, and the cathode of the thyristor Q6 is connected with the control center;
the judger comprises a diode D3, the anode of the diode D3 is connected with the collector of a triode Q4 in the calculator, the cathode of the diode D3 is respectively connected with one end of a capacitor C8 and the control electrode of a thyristor Q5, the anode of the thyristor Q5 is connected with the output end of an operational amplifier U3B in the calculator, the cathode of the thyristor Q5 is connected with one end of a resistor R23, the other end of the resistor R23 is respectively connected with one end of a resistor R24 and the same-phase end of the operational amplifier U4B, the other end of the resistor R24 is respectively connected with one end of a resistor R15 in the calculator and the emitter of a triode Q3 in the sound calculating circuit, the reverse-phase end of the operational amplifier U4B is respectively connected with one end of a resistor R22 and one end of a resistor R21, the output end of the operational amplifier U4B is respectively connected with the power receiving end and one end of a resistor R20, the other end of a resistor R20 is respectively connected with one end of a capacitor C1 and one end of a relay K1, and one end of a switch S1 is connected with the emitter of the audio calculating circuit 2 in the triode Q2, the other end of the switch S1 is respectively connected with the anode of a diode D4, one end of a resistor R27, the base of a triode Q1 and the anode of a thyristor Q6 in the calculator, the cathode of a diode D4 is respectively connected with one end of a capacitor C2 and the control electrode of a thyristor Q6 in the calculator, the emitter of the triode Q1 is respectively connected with the other end of a resistor R27, the other end of a resistor R26 in the calculator and the collector of a triode Q3 in the voice calculation circuit and is connected with a positive power supply VCC, the collector of the triode Q1 is connected with one end of a resistor R28, the other end of the resistor R28 is respectively connected with the other end of a capacitor C2, the other end of a relay K1, the other end of a capacitor C1, the other end of a resistor R22, the other end of a capacitor C8, the other end of a resistor R25 in the calculator and one end of a resistor R14 in the voice calculation circuit and is connected in parallel with the ground;
the voltage processing circuit comprises a calculator and a judger, the calculator transmits a voltage signal output by the sound calculation circuit to an operational amplifier U3B by using a resistor R15, the operational amplifier U3 performs subtraction operation on the voltage signal and a standard voltage signal provided by the resistor R18, wherein the standard voltage signal is a voltage required by the normal operation of the alternating current contactor, the operational amplifier U3B outputs a difference signal of the voltage signal and the difference signal by using an operational amplifier U5B to perform zero-crossing comparison on the difference signal, whether the difference signal is a positive value or a negative value is detected, when the operational amplifier U5B conducts a diode D5, the voltage provided by the alternating current contactor by a power supply is enough, namely the alternating current contactor generates noise and is not caused by insufficient voltage provided by the power supply, at the moment, the diode D5 conducts a thyristor Q6 through a capacitor C7, the thyristor Q6 transmits the noise signal to a control center, and reminds the control center of performing other detection on the alternating current contactor, when the operational amplifier U5B turns on the transistor Q4, which indicates that the voltage supplied by the power supply to the ac contactor is insufficient, that is, the noise generated by the ac contactor may be caused by the insufficient voltage supplied by the power supply, the transistor Q4 turns on the diode D3, that is, the determiner turns on, the diode D3 turns on the thyristor Q5 through the capacitor C8, the thyristor Q5 transmits the difference signal to the operational amplifier U4B to be added with the voltage signal, so as to compensate the voltage signal, the compensated voltage signal is output to the power receiving terminal of the ac contactor, the compensated voltage signal is delayed by the resistor R20 and the capacitor C1 to turn on the relay K1, that is, whether the noise disappears after the voltage signal received by the ac contactor is compensated is observed, the relay K1 turns on the switch S1, and the noise signal is detected by the diode D4 and the transistor Q1, if diode D1 switches on, it is not only that the noise that the electro-magnet of ac contactor sent out when the during operation is not just that the voltage that the power provided is not enough causes, there are other reasons in addition, diode D4, electric capacity C2 switch on thyristor Q6 this moment, thyristor Q6 outputs alarm signal to control center, remind the staff to carry out comprehensive detection to the reason that the electro-magnet of ac contactor sent out the noise, and when the noise signal switched on triode Q1, it has shown that the noise signal has weakened the major part and has even disappeared, it is that the electro-magnet of ac contactor sent out the noise and is caused by the power is not enough when the during operation, but because the noise signal has disappeared this moment, need not to inform the staff of control center to maintain ac contactor.
When the invention is used, the sound calculating circuit outputs the sound signal output by the microphone M1 to the multiplier V2, and multiplies the sound signal by the normal sound signal to obtain a frequency difference signal and a frequency sum signal of the sound signal and the normal sound signal, a low-pass filter consisting of a resistor R6, a capacitor C3, a resistor R7 and a capacitor C5 is used for low-pass filtering, so that the noise signal is conducted by a diode D2 through a relay K2 and is transmitted to a voltage processing circuit, after the relay K2 is conducted, a switch S2 is closed, the voltage signal is transmitted to the rectifier D1 for conversion, the rectifier D1 converts the voltage signal from an alternating current state to a direct current state, a triode Q3 transmits the voltage signal to the voltage processing circuit, the voltage processing circuit comprises a calculator and a judger, the calculator transmits the voltage signal output by the sound calculating circuit to an operational amplifier U3B by a resistor R15, the operational amplifier U3B performs subtraction operation on the voltage signal and the standard voltage signal, the operational amplifier U3B outputs a difference signal between the two signals, the operational amplifier U5B performs zero-crossing comparison on the difference signal, when the operational amplifier U5B turns on the diode D5, namely, when the alternating current contactor generates noise which is not caused by insufficient voltage provided by a power supply, the diode D5 turns on the thyristor Q6 through the capacitor C7, the thyristor Q6 transmits the noise signal to the control center to remind the control center of performing other detection on the alternating current contactor, when the operational amplifier U5B turns on the triode Q4, namely, when the alternating current contactor generates noise which is caused by insufficient voltage provided by the power supply, the triode Q4 turns on the diode D3, namely, the determiner turns on the diode D3 turns on the thyristor Q5 through the capacitor C8, the thyristor Q5 transmits the difference signal to the operational amplifier U4 to perform addition operation with the voltage signal 4B, the compensated voltage signal is output to the power receiving end of the AC contactor, the relay K1 is conducted by the compensated voltage signal through the resistor R20 and the capacitor C1 in a delayed mode, that is, it is observed whether the noise disappears after compensating the voltage signal received by the ac contactor, the relay K1 is turned on to close the switch S1, the noise signal is detected by the diode D4 and the transistor Q1, if the diode D1 is turned on, it indicates that the noise generated by the electromagnet of the AC contactor is not only caused by insufficient voltage provided by the power supply when the electromagnet of the AC contactor works, but also has other reasons, at the moment, the diode D4 and the capacitor C2 conduct the thyristor Q6, the thyristor Q6 outputs an alarm signal to the control center to remind the staff of comprehensively detecting the reason of the noise generated by the electromagnet of the AC contactor, when the transistor Q1 is turned on by a noise signal, the electromagnet of the ac contactor generates noise when operating, which is caused by insufficient power.
The invention achieves the following effects:
(1) the method comprises the steps that a sound signal sent by an alternating current contactor during working is collected by a sound calculation circuit, a noise signal is obtained by the sound signal, the noise signal is utilized to start to receive a voltage signal provided by a power supply for the alternating current contactor, a voltage processing circuit is utilized to calculate and judge the voltage signal, whether the noise sent by an electromagnet of the alternating current contactor is caused by insufficient voltage provided by the power supply is finally obtained, and when the voltage provided by the power supply is insufficient, the voltage signal of the alternating current contactor is compensated, so that the generation of noise is avoided, the phenomenon that the function of the alternating current contactor is greatly influenced in the past is also avoided, and the normal work and the safe use of a power switch cabinet are prevented from being influenced;
(2) in the sound calculation circuit, the sound signal is subjected to multiplication and filtering processing to obtain a noise signal, and the Q value of the low-pass filter is increased by using an operational amplifier U2B, so that large loss of the noise signal is avoided when the noise signal is obtained;
(3) the voltage processing circuit is used for carrying out subtraction operation on the voltage signal so as to obtain a difference signal, and the difference signal is judged, thereby judging whether the noise generated by the electromagnet of the AC contactor is caused by insufficient voltage provided by the power supply, when the judgment result is not caused by the insufficient voltage provided by the power supply, the noise signal is sent to the control center, reminding workers, compensating the voltage signal received by the alternating current contactor when judging that the voltage provided by the power supply is possibly insufficient, namely, the noise is processed, the detection of the noise signal is started in a delayed way, the state of the noise is further detected, the reason why the electromagnet of the alternating current contactor generates the noise when working is further reminded to the working personnel, and then reduce maintenance personal's maintenance work, also further guarantee power switch cabinet's safe handling.
Claims (6)
1. The utility model provides a power switch cabinet detection circuitry based on thing networking, a serial communication port, detection circuitry includes sound calculation circuit and voltage processing circuit, sound calculation circuit utilizes the sound signal of the alternating current contactor's that microphone M1 gathered electro-magnet to obtain noise signal after handling sound signal, utilize the voltage signal transmission that noise signal provided alternating current contactor's power to voltage processing circuit, and transmit noise signal to voltage processing circuit simultaneously, voltage processing circuit obtains the difference signal after operating voltage signal, and judges the difference signal, then operates voltage signal once more, and the time delay is judged the noise signal, finally outputs alarm signal to control center.
2. The power switch cabinet detection circuit based on the internet of things as claimed in claim 1, wherein the sound calculation circuit utilizes a sound signal of an electromagnet of the ac contactor collected by a microphone M1, and multiplies and filters the sound signal to obtain a noise signal, and utilizes the noise signal to transmit a voltage signal provided by a power supply of the ac contactor to the voltage processing circuit and simultaneously transmits the noise signal to the voltage processing circuit.
3. The power switch cabinet detection circuit based on the internet of things as claimed in claim 2, wherein the sound calculation circuit comprises a microphone M1, one end of the microphone M1 is respectively connected to one end of a resistor R1, one end of a resistor R11, and a pin 1 of a multiplier V2, a pin 2 of a multiplier V2 is connected to one end of a resistor R3, the other end of a resistor R1 is respectively connected to the other end of a resistor R3, a collector of a transistor Q2, one end of a resistor R10, one end of a resistor R13, a collector of a transistor Q3 is connected to a positive power VCC, an output end of a multiplier V1 is connected to one end of a resistor R6, the other end of a resistor R6 is respectively connected to one end of a capacitor C3 and one end of a resistor R7, the other end of a resistor R7 is respectively connected to one end of a capacitor C5 and a non-phase end of an operational amplifier U2B, an inverting end of an operational amplifier U2B is respectively connected to one end of a resistor R8 and one end of a resistor R5, the output end of the operational amplifier U2B is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the other end of a resistor R10 and the base of a triode Q2, the emitter of a triode Q2 is connected with one end of a resistor R9 and the anode of a diode D2, the cathode of a diode D2 is connected with one end of a relay K2, one end of a switch S2 is connected with a voltage signal, the other end of a switch S2 is connected with the right end of a rectifier D1, the upper end of the rectifier D1 is connected with one end of a capacitor C6 and one end of a resistor R14 in parallel connection with ground, the lower end of the rectifier D1 is connected with one end of a resistor R12 and the other end of a capacitor C6, the other end of the resistor R12 is connected with the other end of a resistor R13, the base of a triode Q3, the emitter of a transistor Q3 is connected with the other end of a resistor R14, the left end of the rectifier D1 is connected with the other end of a relay K2, the other end of the resistor R9 and the other end of the resistor R8, The other end of the capacitor C3, the other end of the capacitor C5, the other end of the resistor R11, and the other end of the microphone M1 are connected in parallel to ground.
4. The internet-of-things-based power switch cabinet detection circuit as claimed in claim 1, wherein the voltage processing circuit comprises a calculator and a determiner, the calculator subtracts the voltage signal output by the voice calculation circuit to obtain a difference signal, and determines the difference signal to activate the determiner, the determiner adds the voltage signal, then delays to start the determination of the noise signal, and finally outputs an alarm signal to the control center.
5. The Internet of things-based power switch cabinet detection circuit as claimed in claim 4, wherein the calculator comprises a resistor R15, one end of the resistor R15 is connected with an emitter of a triode Q3 in the sound calculation circuit, the other end of the resistor R15 is connected with one end of a resistor R16 and a non-inverting end of an operational amplifier U3B, inverting ends of the operational amplifier U3B are connected with one end of a resistor R18 and one end of a resistor R17, output ends of the operational amplifier U3B are connected with the other end of the resistor R17 and one end of a resistor R19, the other end of the resistor R19 is connected with an inverting end of an operational amplifier U5B, an output end of the operational amplifier U5B is connected with an anode of a diode D5, a base of a triode Q5 and one end of a resistor R26, emitters of the triode Q4 are connected with the other end of a resistor R26, the other end of the resistor R18, a collector of a triode Q3 in the sound calculation circuit, a positive collector of a resistor VCC 5739 and a power supply, the collector of the triode Q4 is connected with one end of a resistor R25, the other end of a resistor R25 is respectively connected with the inverting terminal of the operational amplifier U5B, the other end of the resistor R26, one end of a capacitor C7 and one end of a resistor R14 in the sound calculating circuit and is connected with the ground, the cathode of a diode D5 is respectively connected with the control electrode of the thyristor Q6 and the other end of the capacitor C7, the anode of the thyristor Q6 is connected with the cathode of a diode D2 in the sound calculating circuit, and the cathode of the thyristor Q6 is connected with the control center.
6. The Internet of things-based power switch cabinet detection circuit as claimed in claim 4, wherein the determiner comprises a diode D3, the anode of the diode D3 is connected with the collector of a triode Q4 in the calculator, the cathode of the diode D3 is connected with one end of a capacitor C8 and the control electrode of a thyristor Q5 respectively, the anode of the thyristor Q5 is connected with the output end of an operational amplifier U3B in the calculator, the cathode of the thyristor Q5 is connected with one end of a resistor R23, the other end of the resistor R23 is connected with one end of a resistor R24 and the same-phase end of the operational amplifier U4B respectively, the other end of the resistor R24 is connected with one end of a resistor R15 in the calculator and the emitter of the triode Q3 in the sound calculation circuit, the inverting end of the operational amplifier U4B is connected with one end of a resistor R22 and one end of a resistor R21 respectively, the output end of the operational amplifier U4B is connected with the power receiving end of a power supply and one end of a resistor R20 respectively, the other end of the resistor R20 is connected with one end of a capacitor C1 and one end of a relay K1 respectively, one end of a switch S1 is connected with an emitter of a triode Q2 in the sound calculation circuit, the other end of the switch S1 is connected with an anode of a diode D4, one end of a resistor R27, a base of a triode Q1 and an anode of a thyristor Q6 in the calculator respectively, a cathode of a diode D4 is connected with one end of a capacitor C2 and a control electrode of a thyristor Q6 in the calculator respectively, an emitter of a triode Q1 is connected with the other end of a resistor R27, the other end of a resistor R26 in the calculator and a collector of a triode Q3 in the sound calculation circuit and is connected with a positive power supply VCC, a collector of a triode Q1 is connected with one end of a resistor R28, the other end of a resistor R28 is connected with the other end of a capacitor C2, the other end of a relay K1, the other end of a capacitor C1, the other end of a resistor R22 and the other end of a capacitor C8 respectively, The other end of the resistor R25 in the calculator and one end of the resistor R14 in the sound calculation circuit are connected in parallel to ground.
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| CN115078985A (en) * | 2022-06-23 | 2022-09-20 | 华侨大学 | Fault detection device of relay |
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