CN113970357B - Power switch cabinet detection circuit based on Internet of things - Google Patents
Power switch cabinet detection circuit based on Internet of things Download PDFInfo
- Publication number
- CN113970357B CN113970357B CN202111441836.1A CN202111441836A CN113970357B CN 113970357 B CN113970357 B CN 113970357B CN 202111441836 A CN202111441836 A CN 202111441836A CN 113970357 B CN113970357 B CN 113970357B
- Authority
- CN
- China
- Prior art keywords
- resistor
- triode
- sound
- signal
- respectively connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- 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
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a detection circuit of a power switch cabinet based on the Internet of things, which effectively solves the problem that the function of an alternating current contactor is affected due to the arrangement of a sensor of the alternating current contactor in the prior art.
Description
Technical Field
The invention relates to the field of detection of the Internet of things, in particular to a detection circuit of a power switch cabinet based on the Internet of things.
Background
The AC contactor is used as an important component of the power switch cabinet, and the safety of the AC contactor is closely related to the normal use of the power switch cabinet, so that when the power company detects the power switch cabinet by using the Internet of things, the AC contactor is also detected by the sensor, and detected signals are transmitted to the control center for analysis, thereby realizing better effect of closely monitoring the states of the power switch cabinet and the AC contactor.
The utility company has set up multiple sensor to power switch cabinet, like temperature sensor, smell sensor, humidity transducer etc. but when setting up the sensor to ac contactor, because the trouble that ac contactor that temperature cause and voltage cause took place is more, set up temperature sensor and voltage sensor to ac contactor, and the noise that the electro-magnet of ac contactor sent is loud but do not make power switch cabinet appear serious trouble and do not set up the noise sensor, but the electro-magnet of ac contactor always sends the noise and also can cause the influence to ac contactor's function, long-time also can influence power switch cabinet's safe handling.
The present invention thus 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, which effectively solves the problem that the function of an alternating current contactor is affected due to the arrangement of a sensor of the alternating current contactor in the prior art.
The technical scheme that the detection circuit of the power switch cabinet based on the Internet of things comprises a sound calculation circuit and a voltage processing circuit, wherein the sound calculation circuit is used for processing a sound signal of an electromagnet of an alternating current contactor collected by a microphone M1 to obtain a noise signal, the noise signal is used for transmitting a voltage signal provided by a power supply of the alternating current contactor to the voltage processing circuit and transmitting the noise signal to the voltage processing circuit, the voltage processing circuit is used for calculating the voltage signal to obtain a difference signal and judging the difference signal, then the voltage signal is calculated again, the noise signal is judged in a delayed mode, and finally an alarm signal is output to a control center.
Further, the sound calculating circuit uses the sound signal of the electromagnet of the ac contactor collected by the microphone M1, 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.
Further, the sound computing circuit comprises a microphone M1, one end of the microphone M1 is respectively connected with one end of a resistor R1, one end of a resistor R11 and a 1 pin of a multiplier V2, a 2 pin of the 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 a resistor R10, one end of a resistor R13, a collector of the triode Q3 and a positive polarity power supply VCC, an output end of the 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 an in-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, the other end of the resistor R4 is respectively connected with the other end of the resistor R10 and the base electrode of the triode Q2, the emitter of the triode Q2 is respectively connected with one end of the resistor R9 and the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with one end of the relay K2, one end of the switch S2 is connected with a voltage signal, the other end of the switch S2 is connected with the right end of the rectifier D1, the upper end of the rectifier D1 is respectively connected with one end of the capacitor C6 and one end of the resistor R14 and is connected with the ground, the lower end of the rectifier D1 is respectively connected with one end of the resistor R12 and the other end of the capacitor C6, the other end of the resistor R12 is respectively connected with the other end of the resistor R13, the base electrode of the triode Q3 is connected with the other end of the resistor R14, the left end of the rectifier D1 is respectively 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 and the other end of the resistor R11, the other end of the microphone M1 is connected to the ground.
Further, the voltage processing circuit comprises a calculator and a judging device, the calculator performs subtraction operation on the voltage signal output by the sound calculating circuit so as to obtain a difference signal, the difference signal is judged, so that the judging device is started, the judging device performs addition operation on the voltage signal, then delay starts to judge the noise signal, and finally an alarm signal is output to the control center.
Further, the calculator includes a resistor R15, one end of the resistor R15 is connected to an emitter of a triode Q3 in the sound calculation circuit, another end of the resistor R15 is connected to one end of a resistor R16 and an in-phase end of an operational amplifier U3B, an inverting end of the operational amplifier U3B is connected to one end of a resistor R18 and one end of a resistor R17, an output end of the operational amplifier U3B is connected to another end of the resistor R17 and one end of a resistor R19, another end of the resistor R19 is connected to an inverting end of the operational amplifier U5B, an output end of the operational amplifier U5B is connected to an anode of a diode D5, a base of a triode Q4, one end of a resistor R26, an emitter of the triode Q4 is connected to another end of the resistor R26, another end of the resistor R18, a collector of the triode Q3 in the sound calculation circuit, one end of the resistor R13 is connected to a positive polarity power supply, another end of the triode Q4 is connected to one end of the resistor R25, another end of the resistor R25 is connected to another end of the operational amplifier U5B, another end of the resistor R26, a thyristor C7 is connected to a cathode of the sound control transistor C6 in the sound calculation circuit, and another end of the thyristor is connected to a cathode of the sound control transistor Q6 is connected to the cathode of the sound calculation circuit.
Further, the judging device comprises a diode D3, the positive electrode of the diode D3 is connected with the collector electrode of a triode Q4 in the calculator, the negative electrode 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 an 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 electrode of the triode Q3 in the sound calculating circuit, the opposite-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 supply receiving end and one end of a resistor R20, the other end of the resistor R20 is respectively connected with one end of a capacitor C1 and one end of a relay K1, one end of the switch S1 is connected with an emitter of a triode Q2 in the sound computing circuit, the other end of the switch S1 is respectively connected with an anode of a diode D4, one end of a resistor R27, a base electrode of the triode Q1 and an anode of a thyristor Q6 in the calculator, a cathode of the diode D4 is respectively connected with one end of a capacitor C2 and a control electrode of the thyristor Q6 in the calculator, the emitter of the triode Q1 is respectively connected with the other end of the resistor R27, the other end of a resistor R26 in the calculator, a collector of a triode Q3 in the sound computing circuit and connected with a positive polarity 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 the capacitor C2, the other end of a 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, one end of the resistor R14 in the sound calculation circuit is connected to the ground.
The invention has the following beneficial effects:
the sound computing circuit is used for collecting sound signals sent by the AC contactor during working, the sound signals are used for obtaining noise signals, the noise signals are used for starting to receive voltage signals provided by the power supply for the AC contactor, the voltage processing circuit is used for computing and judging the voltage signals, whether the noise sent by the electromagnet of the AC contactor is caused by insufficient voltage provided by the power supply or not is finally obtained, when the voltage provided by the power supply is insufficient by the AC contactor, the voltage signals of the AC contactor are compensated, noise is avoided, the function of the AC contactor is also prevented from being greatly influenced for a long time, and the normal working and safe use of the power switch cabinet are prevented from being influenced.
Drawings
Fig. 1 is a schematic diagram of a sound computing circuit of the present invention.
Fig. 2 is a schematic diagram of a voltage processing circuit according to the present invention.
Detailed Description
The foregoing and other features, aspects and advantages of the present invention will become more apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying figures 1-2. The following embodiments are described in detail with reference to the drawings.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides a power switch cabinet detection circuitry based on thing networking, is applied on the alternating current contactor of power switch cabinet, detection circuitry includes sound calculation circuit and voltage processing circuit, sound calculation circuit utilizes the sound signal of the electro-magnet of alternating current contactor that microphone M1 gathered to obtain noise signal after handling the sound signal, utilizes noise signal to transmit voltage signal that alternating current contactor's power provided to voltage processing circuit, and simultaneously with noise signal transmission to voltage processing circuit, voltage processing circuit obtains the difference signal after carrying out the operation with voltage signal, and judges the difference signal, then carries out the operation again with voltage signal, and delay judges noise signal, output alarm signal to control center at last.
The sound computing circuit comprises a microphone M1, one end of the microphone M1 is respectively connected with one end of a resistor R1, one end of a resistor R11 and a 1 pin of a multiplier V2, a 2 pin of the 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, the collector of a triode Q2, one end of a resistor R10, one end of a resistor R13, the collector of the triode Q3 and a positive polarity power VCC, the output end of the 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, the reverse phase end of the operational amplifier U2B is respectively connected with 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 respectively connected with the other end of the resistor R10 and the base electrode of the triode Q2, the emitter of the triode Q2 is respectively connected with one end of the resistor R9 and the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with one end of the relay K2, one end of the switch S2 is connected with a voltage signal, the other end of the switch S2 is connected with the right end of the rectifier D1, the upper end of the rectifier D1 is respectively connected with one end of the capacitor C6 and one end of the resistor R14 and is connected with the ground, the lower end of the rectifier D1 is respectively connected with one end of the resistor R12 and the other end of the capacitor C6, the other end of the resistor R12 is respectively connected with the other end of the resistor R13, the base electrode of the triode Q3 is connected with the other end of the resistor R14, the left end of the rectifier D1 is respectively 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 and the other end of the resistor R11, the other end of the microphone M1 is connected with the ground;
the sound computing circuit utilizes the sound signal of the electromagnet of the alternating current contactor collected by the microphone M1, the sound signal output by the microphone M1 is output to the multiplier V2, the multiplication operation is carried out on the sound signal and the normal sound signal provided by the resistor R3 when the electromagnet of the alternating current contactor is normal, the frequency difference signal, the frequency and the signal of the sound signal are obtained, the low-pass filter composed of the resistor R6, the capacitor C3, the resistor R7 and the capacitor C5 is utilized for carrying out low-pass filtering, thus obtaining the frequency difference signal, the frequency difference signal is the noise signal, namely the electromagnet of the alternating current contactor emits noise when working, the Q value of the low-pass filter composed of the resistor R6, the capacitor C3, the resistor R7 and the capacitor C5 is improved by the operational amplifier U2B, the loss caused by the low-pass filtering of the noise signal is reduced, the conduction loss of the noise signal is reduced by utilizing the triode Q2, the loss of the noise signal is further reduced, the noise signal is conducted by the relay K2 through the diode D2 and is transmitted to the voltage processing circuit, the switch S2 is closed after the relay K2 is conducted, the voltage signal provided by the power supply of the alternating current contactor and detected by any voltage sensor outputting the analog voltage signal in the prior art is transmitted to the rectifier D1 for conversion, the voltage signal obtained by detection of the voltage sensor is the prior art, the technology is not repeated, the rectifier D1 converts the voltage signal from the alternating current conversion state to the direct current state, the resistor R12 transmits the voltage signal to the triode Q3 for improving the response capability of the voltage signal, and the triode Q3 transmits the voltage signal 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 opposite-phase 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 the resistor R17 and one end of a resistor R19, the other end of the resistor R19 is connected with the opposite-phase end of the operational amplifier U5B, the 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, the emitter of the triode Q4 is respectively connected with the other end of the resistor R26, the other end of the resistor R18, a collector of the triode Q3 in the sound calculation circuit and one end of the resistor R13 and connected with a positive-polarity power VCC, the collector of the triode Q4 is connected with one end of the resistor R25, the other end of the resistor R25 is respectively connected with the opposite-phase end of the operational amplifier U5B, the other end of the resistor R26, one end of the resistor C7, the thyristor C7 in the sound calculation circuit is connected with the cathode of the triode Q6, and the sound control circuit is connected with the cathode of the loudspeaker Q6 in the sound calculation circuit, and the loudspeaker Q6 is connected with the cathode of the loudspeaker Q6;
the said judgement device includes diode D3, the positive pole of diode D3 is connected with collector electrode of triode Q4 in the calculator, negative pole of diode D3 connects one end of capacitor C8, control electrode of thyristor Q5, positive pole of thyristor Q5 is connected with output end of operational amplifier U3B in the calculator, negative pole of thyristor Q5 is connected with one end of resistor R23, another end of resistor R23 connects one end of resistor R24, the same phase end of operational amplifier U4B, another end of resistor R24 connects one end of resistor R15 in the calculator, one end of resistor R22 connects one end of resistor R21, one end of resistor R4B connects one end of triode Q3, output end of operational amplifier U4B connects one end of power supply receiving end, one end of resistor R20 connects one end of capacitor C1 respectively, one end of relay K1, one end of switch S1 connects one end of triode Q2 in the sound calculating circuit, another end of switch S1 connects one end of resistor R24 with emitter electrode of triode Q2 in the sound calculating circuit, one end of switch S1 connects one end of resistor R4, one end of triode Q1 in the sound calculating circuit connects one end of triode Q1, one end of triode Q2 in the sound calculating circuit connects one end of resistor R1, one end of triode Q2 in the sound calculating circuit, one end of triode Q2 in the resistor R2, one end of triode Q2 in the resistor C2 is connected with resistor C2, one end of resistor C2R 21 connects one end of resistor C2, one end of R4B, one end of the resistor C2, one end of the output end of the resistor C4B is connected with the other end, one end of the resistor, one end of the other end, one end of the resistor, one end, one end of a resistor R14 in the sound calculation circuit is connected with the ground;
the voltage processing circuit comprises a calculator and a judging device, the calculator transmits the voltage signal output by the sound calculating circuit to the operational amplifier U3B by using the resistor R15, the operational amplifier U3 performs subtraction operation on the voltage signal and the standard voltage signal provided by the resistor R18, wherein the standard voltage signal is the voltage required by the normal operation of the AC contactor, the operational amplifier U3B outputs the difference signal of the two signals, the operational amplifier U5B is used for carrying out zero-crossing comparison on the difference signal to detect whether the difference signal is positive or negative, when the operational amplifier U5B conducts the diode D5, the voltage provided by the AC contactor is enough at the moment, namely the noise generated by the AC contactor is not caused by the insufficient voltage provided by the power supply, the diode D5 conducts the thyristor Q6 by the capacitor C7, the thyristor Q6 transmits the noise signal to the control center, the reminding control center needs to carry out other detection on the AC contactor, when the operational amplifier U5B conducts the triode Q4, the fact that the voltage provided by the power supply for the AC contactor is insufficient is indicated, namely, noise emitted by the AC contactor is possibly caused by the insufficient voltage provided by the power supply, the triode Q4 conducts the diode D3, the judging device is conducted, the diode D3 conducts the thyristor Q5 through the capacitor C8, the thyristor Q5 transmits a difference signal to the operational amplifier U4B to carry out addition operation with the voltage signal, the voltage signal is compensated, the compensated voltage signal is output to the power receiving end of the AC contactor, the relay K1 is conducted by utilizing the resistor R20 and the capacitor C1 in a delayed mode, whether the noise disappears after the voltage signal received by the AC contactor is compensated is observed, the switch S1 is closed after the relay K1 is conducted, the noise signal is detected through the diode D4 and the triode Q1, if the diode D1 is conducted, the fact that the electromagnet of the alternating current contactor emits noise when in operation is not only caused by insufficient voltage provided by a power supply, but also caused by other reasons, at the moment, the diode D4 and the capacitor C2 conduct the thyristor Q6, the thyristor Q6 outputs an alarm signal to a control center, a worker is reminded of comprehensively detecting the reason that the electromagnet of the alternating current contactor emits noise, and when the triode Q1 is conducted by the noise signal, the fact that the noise signal weakens a large part and even disappears is shown, namely, the electromagnet of the alternating current contactor emits noise when in operation and is caused by insufficient power supply, but the noise signal is disappeared at the moment, and the worker of the control center is not required to be informed to repair the alternating current contactor.
When the invention is used, the sound computing circuit outputs the sound signal output by the microphone M1 to the multiplier V2, performs multiplication operation with the normal sound signal to obtain the frequency difference signal and the frequency sum signal of the sound signal and the normal sound signal, and utilizes the low-pass filter formed by the resistor R6, the capacitor C3, the resistor R7 and the capacitor C5 to perform low-pass filtering, so that the noise signal is conducted by the diode D2, the relay K2 is conducted and transmitted to the voltage processing circuit, the switch S2 is closed after the relay K2 is conducted, 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, the triode Q3 transmits the voltage signal to the voltage processing circuit, the voltage processing circuit comprises a calculator and a judging device, the calculator transmits the voltage signal output by the sound calculation circuit to the operational amplifier U3B by using the 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 of the voltage signal and the standard voltage signal, the operational amplifier U5B is used for performing zero-crossing comparison on the difference signal, when the operational amplifier U5B conducts the diode D5, i.e. the AC contactor emits noise which is not caused by insufficient voltage provided by a power supply, the diode D5 conducts the thyristor Q6 through the capacitor C7, the thyristor Q6 transmits the noise signal to the control center to remind the control center of other detection on the AC contactor, when the operational amplifier U5B conducts the triode Q4, i.e. the AC contactor emits noise which is possibly caused by insufficient voltage provided by the power supply, the triode Q4 conducts the diode D3, i.e. the diode D3 conducts the thyristor Q5 through the capacitor C8, the thyristor Q5 transmits a difference signal to the operational amplifier U4B to carry out addition operation with a voltage signal, the compensated voltage signal is output to a power receiving end of an alternating current contactor, the relay K1 is conducted by utilizing the compensated voltage signal through the resistor R20 and the capacitor C1 in a delayed mode, namely whether noise disappears after the received voltage signal of the alternating current contactor is compensated, the relay K1 is conducted and then the switch S1 is closed, a noise signal is detected through the diode D4 and the triode Q1, if the diode D1 is conducted, the fact that the electromagnet of the alternating current contactor emits noise when working is not caused by insufficient voltage provided by the power supply is indicated, and other reasons exist, the diode D4 and the capacitor C2 conduct the thyristor Q6, the thyristor Q6 outputs an alarm signal to a control center, and workers are reminded of comprehensively detecting the reason that the electromagnet of the alternating current contactor emits noise when the triode Q1 is conducted, namely that the electromagnet of the alternating current contactor emits noise when working is caused by insufficient power supply.
The invention realizes the following effects:
(1) The method comprises the steps that a sound computing circuit is used for collecting sound signals sent out by an alternating-current contactor during working, the sound signals are used for obtaining noise signals, the noise signals are used for starting to receive voltage signals provided by a power supply for the alternating-current contactor, a voltage processing circuit is used for computing and judging the voltage signals, whether the noise sent out by an electromagnet of the alternating-current contactor is caused by insufficient voltage provided by the power supply or not is finally obtained, when the voltage provided by the power supply received by the alternating-current contactor is insufficient, the voltage signals of the alternating-current contactor are compensated, noise is avoided, the function of the alternating-current contactor is prevented from being greatly influenced for a long time, and the normal working and safe use of a power switch cabinet are prevented from being influenced;
(2) The sound signal is subjected to multiplication and filtering processing in the sound calculation circuit so as to obtain a noise signal, and the Q value of the low-pass filter is improved by utilizing the operational amplifier U2B, so that the noise signal is prevented from being greatly lost when the noise signal is obtained;
(3) The voltage processing circuit is used for carrying out subtraction operation on the voltage signals to obtain difference signals, and judging the difference signals, so that whether the noise emitted by the electromagnet of the alternating current contactor is caused by insufficient voltage provided by the power supply is judged, the noise signals are sent to the control center when the noise signals are judged not to be caused by insufficient voltage provided by the power supply, workers are reminded, the voltage signals received by the alternating current contactor are compensated when the noise signals are judged to be possibly caused by insufficient voltage provided by the power supply, namely, the noise signals are processed, the detection is delayed to be started, the noise state is further detected, the electromagnet of the alternating current contactor is further reminded of the reason that the electromagnet of the alternating current contactor emits noise during working, maintenance work of maintenance workers is further reduced, and safe use of the power switch cabinet is further guaranteed.
Claims (3)
1. The detection circuit is characterized by comprising a sound calculation circuit and a voltage processing circuit, wherein the sound calculation circuit utilizes a sound signal of an electromagnet of an alternating current contactor collected by a microphone M1, processes the sound signal to obtain a noise signal, transmits a voltage signal provided by a power supply of the alternating current contactor to the voltage processing circuit by utilizing the noise signal, and simultaneously transmits the noise signal to the voltage processing circuit, the voltage processing circuit calculates the voltage signal to obtain a difference signal, judges the difference signal, then calculates the voltage signal again, delays to judge the noise signal, and finally outputs an alarm signal to a control center;
the sound computing circuit comprises a microphone M1, one end of the microphone M1 is respectively connected with one end of a resistor R1, one end of a resistor R11 and a 1 pin of a multiplier V2, a 2 pin of the 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, the collector of a triode Q2, one end of a resistor R10, one end of a resistor R13, the collector of the triode Q3 and a positive polarity power VCC, the output end of the 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, the reverse phase end of the operational amplifier U2B is respectively connected with 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 respectively connected with the other end of the resistor R10 and the base electrode of the triode Q2, the emitter of the triode Q2 is respectively connected with one end of the resistor R9 and the positive electrode of the diode D2, the negative electrode of the diode D2 is connected with one end of the relay K2, one end of the switch S2 is connected with a voltage signal, the other end of the switch S2 is connected with the right end of the rectifier D1, the upper end of the rectifier D1 is respectively connected with one end of the capacitor C6 and one end of the resistor R14 and is connected with the ground, the lower end of the rectifier D1 is respectively connected with one end of the resistor R12 and the other end of the capacitor C6, the other end of the resistor R12 is respectively connected with the other end of the resistor R13, the base electrode of the triode Q3 is connected with the other end of the resistor R14, the left end of the rectifier D1 is respectively 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 and the other end of the resistor R11, the other end of the microphone M1 is connected with the ground;
the voltage processing circuit comprises a calculator and a judging device, 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 computing circuit, the other end of the resistor R15 is respectively connected with one end of a resistor R16 and an in-phase 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 the resistor R17 and one end of a resistor R19, the other end of the resistor R19 is connected with an inverting end of the operational amplifier U5B, the 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, the emitter of the triode Q4 is respectively connected with the other end of the resistor R26 and the other end of the resistor R18, one end of the triode Q3 in the sound computing circuit, one end of the resistor R13 is connected with a power supply, the other end of the triode Q25 is connected with one end of the resistor R25, the other end of the resistor R25 is respectively connected with the other end of the operational amplifier U5B, the other end of the resistor R26 is connected with the resistor Q6, the other end of the resistor C6 is connected with the positive end of the sound computing circuit, and the positive end of the diode Q6 is connected with the positive end of the sound computing circuit, and the negative end of the sound computing circuit is connected with the diode Q6 is connected with the positive end of the diode Q6;
the said judgement device includes diode D3, the positive pole of diode D3 is connected with collector electrode of triode Q4 in the calculator, negative pole of diode D3 connects one end of capacitor C8, control electrode of thyristor Q5, positive pole of thyristor Q5 is connected with output end of operational amplifier U3B in the calculator, negative pole of thyristor Q5 is connected with one end of resistor R23, another end of resistor R23 connects one end of resistor R24, the same phase end of operational amplifier U4B, another end of resistor R24 connects one end of resistor R15 in the calculator, one end of resistor R22 connects one end of resistor R21, one end of resistor R4B connects one end of triode Q3, output end of operational amplifier U4B connects one end of power supply receiving end, one end of resistor R20 connects one end of capacitor C1 respectively, one end of relay K1, one end of switch S1 connects one end of triode Q2 in the sound calculating circuit, another end of switch S1 connects one end of resistor R24 with emitter electrode of triode Q2 in the sound calculating circuit, one end of switch S1 connects one end of resistor R4, one end of triode Q1 in the sound calculating circuit connects one end of triode Q1, one end of triode Q2 in the sound calculating circuit connects one end of resistor R1, one end of triode Q2 in the sound calculating circuit, one end of triode Q2 in the resistor R2, one end of triode Q2 in the resistor C2 is connected with resistor C2, one end of resistor C2R 21 connects one end of resistor C2, one end of R4B, one end of the resistor C2, one end of the output end of the resistor C4B is connected with the other end, one end of the resistor, one end of the other end, one end of the resistor, one end, one end of the resistor R14 in the sound calculation circuit is connected to the ground.
2. The power switch cabinet detection circuit based on the internet of things according to claim 1, wherein the sound calculation circuit uses the sound signal of the electromagnet of the ac contactor collected by the microphone M1, multiplies and filters the sound signal to obtain a noise signal, and uses 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 according to claim 1, wherein the calculator performs subtraction on the voltage signal output by the sound calculation circuit to obtain a difference signal, and judges the difference signal to start the judging device, the judging device performs addition on the voltage signal, then delays start of judgment on the noise signal, and finally outputs an alarm signal to the control center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111441836.1A CN113970357B (en) | 2021-11-30 | 2021-11-30 | Power switch cabinet detection circuit based on Internet of things |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111441836.1A CN113970357B (en) | 2021-11-30 | 2021-11-30 | Power switch cabinet detection circuit based on Internet of things |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113970357A CN113970357A (en) | 2022-01-25 |
| CN113970357B true CN113970357B (en) | 2023-06-23 |
Family
ID=79590372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111441836.1A Active CN113970357B (en) | 2021-11-30 | 2021-11-30 | Power switch cabinet detection circuit based on Internet of things |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113970357B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115078985A (en) * | 2022-06-23 | 2022-09-20 | 华侨大学 | Fault detection device of relay |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0116105A1 (en) * | 1983-02-11 | 1984-08-22 | Claude Sa | Domestic power line breaker |
| CN207392300U (en) * | 2017-11-02 | 2018-05-22 | 沈阳农业大学 | Automatic resident living water supply installation under photovoltaic auxiliary powering mode |
| CN108761319A (en) * | 2018-04-08 | 2018-11-06 | 阳光电源股份有限公司 | Relay failure detection method, device and the system of photovoltaic combining inverter |
| CN109765463A (en) * | 2019-03-29 | 2019-05-17 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault disappearance method of discrimination of controllable voltage compensation way |
| CN212784437U (en) * | 2020-07-23 | 2021-03-23 | 国家电网有限公司 | Intelligent condensation preventing device for switch cabinet |
| CN113161164A (en) * | 2021-04-23 | 2021-07-23 | 扬州新概念电气有限公司 | Method for measuring contact abrasion of vacuum circuit breaker |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4039933A (en) * | 1976-03-25 | 1977-08-02 | Instrumentation Laboratory, Inc. | Continuous calibration system and method for analytical instruments |
| DE102012008601B4 (en) * | 2012-04-27 | 2015-12-24 | Audi Ag | Motor vehicle and method for detecting a blocked switching device of a vehicle battery |
| CN103018667B (en) * | 2012-12-11 | 2015-05-20 | 福州大学 | Characteristic test analysis system for alternating current contactor |
| CN104795801B (en) * | 2015-04-29 | 2018-02-16 | 南京南瑞继保电气有限公司 | A kind of breaker non-three phase method of discrimination and device based on voltage |
| CN105353300B (en) * | 2015-10-21 | 2018-04-20 | 珠海格力电器股份有限公司 | A.C. contactor detection method and system |
| CN205691742U (en) * | 2016-06-25 | 2016-11-16 | 河北工业大学 | A kind of omnipotent breaker mechanical fault diagnosis device based on sound detection of shaking |
| CN107643957A (en) * | 2017-09-28 | 2018-01-30 | 河南职业技术学院 | Computer security starting-up method and computer security opening device |
| CN108957309B (en) * | 2018-08-27 | 2023-12-29 | 深圳众城卓越科技有限公司 | Circuit and method for detecting contactor suction condition |
| CN209182412U (en) * | 2018-11-29 | 2019-07-30 | 国网冀北电力有限公司检修分公司 | A kind of triggering monitoring system of compensator with series capaci tance |
| CN111337773A (en) * | 2020-03-18 | 2020-06-26 | 江苏和光智能电气有限公司 | Transformer fault remote monitoring system and monitoring method |
| CN214067313U (en) * | 2021-01-21 | 2021-08-27 | 国网河南省电力公司信息通信公司 | Electric power cabinet trouble early warning device based on communication network |
| CN214669529U (en) * | 2021-05-15 | 2021-11-09 | 河南中州电气设备有限公司 | Power transformer detection device |
-
2021
- 2021-11-30 CN CN202111441836.1A patent/CN113970357B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0116105A1 (en) * | 1983-02-11 | 1984-08-22 | Claude Sa | Domestic power line breaker |
| CN207392300U (en) * | 2017-11-02 | 2018-05-22 | 沈阳农业大学 | Automatic resident living water supply installation under photovoltaic auxiliary powering mode |
| CN108761319A (en) * | 2018-04-08 | 2018-11-06 | 阳光电源股份有限公司 | Relay failure detection method, device and the system of photovoltaic combining inverter |
| CN109765463A (en) * | 2019-03-29 | 2019-05-17 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault disappearance method of discrimination of controllable voltage compensation way |
| CN212784437U (en) * | 2020-07-23 | 2021-03-23 | 国家电网有限公司 | Intelligent condensation preventing device for switch cabinet |
| CN113161164A (en) * | 2021-04-23 | 2021-07-23 | 扬州新概念电气有限公司 | Method for measuring contact abrasion of vacuum circuit breaker |
Non-Patent Citations (3)
| Title |
|---|
| 利用弧声信号的电弧预警保护系统设计;张亮等;华侨大学学报;第31卷(第5期);第496-498页 * |
| 基于UCPS评价标准的网源协同机组负荷频率控制策略;刘拥军等;电力系统自动化;第40卷(第22期);第147-152页 * |
| 密闭式开关柜局部放电的检测与分析;谢宇廷等;2017 年江西省电机工程学会年会论文集;第287-291页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113970357A (en) | 2022-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113970357B (en) | Power switch cabinet detection circuit based on Internet of things | |
| CN101323047B (en) | Resistance spot welding quality control device and method based on electrode displacement | |
| CN205052879U (en) | Electronic cigarette | |
| CN110085019B (en) | Wisdom chemical industry ground construction environment signal acquisition emitter | |
| CN110758173B (en) | Control method and device of charging and discharging detection system and storage medium | |
| CN104422825A (en) | Method and method for detecting insulation resistance against ground of DC power supply | |
| US4247848A (en) | Fire detector with a monitor circuit | |
| CN201126622Y (en) | Multifunctional alarm | |
| CN105423390A (en) | Energy-saving range hood control system based on hybrid circuit processing | |
| GB2407389A (en) | Power saving effect display device in an inverter device | |
| CN113179394A (en) | Remote video monitoring device | |
| CN114062920B (en) | Internet of things detection circuit for power switch cabinet | |
| CN110596519A (en) | Direct current system ground fault detection system based on Fourier transform and detection method thereof | |
| CN213872832U (en) | Range hood washs reminding device and range hood | |
| CN108874138A (en) | A kind of pressure feedback system, electronic equipment and pressure feedback method | |
| CN111203628A (en) | Welding detection method and welding equipment | |
| CN105402794A (en) | Range hood energy-saving control system based on bandpass filtering amplifying circuit | |
| CN210894600U (en) | Overvoltage protection and temperature real-time monitoring circuit of IGBT element | |
| CN214067330U (en) | Draught fan fault detection circuit based on network | |
| CN112985511A (en) | Isolation knife detection device of low-voltage switch cabinet | |
| CN202693703U (en) | Voltage signal conditioning circuit for online resistance spot welding quality monitoring device | |
| CN114243929B (en) | Electrical appliance management circuit for gas station safety | |
| CN110646721A (en) | Overvoltage protection and temperature real-time monitoring circuit of IGBT element | |
| CN104658169A (en) | Intelligent fire alarm system | |
| CN206387554U (en) | A kind of Lei Shi presss from both sides analyzer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |