CN113295979A - Arrester monitoring intelligent sensor based on Internet of things - Google Patents
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
An intelligent arrester monitoring sensor based on the Internet of things comprises a large-current protection circuit, a charging current transformer, a counter circuit, a sampling current transformer, a charging circuit, a power supply switching circuit, a lithium battery, an RTC real-time clock, an amplifying circuit, a processor circuit, an LCD display module, a human body induction module, a wireless communication module and an antenna; the intelligent sensor device for monitoring the lightning arrester adopts the leakage current of the lightning arrester to carry out energy storage and power supply and data wireless transmission, so that the collection, storage and analysis of the discharge times and the leakage current of the lightning arrester and the periodic transmission of the leakage current, the resistive current and the discharge time data are realized.
Description
Technical Field
The invention belongs to the technical field of sensors of the Internet of things, relates to an intelligent sensor for monitoring an arrester based on the Internet of things, and particularly relates to an intelligent sensor device for monitoring the leakage current, the resistive current and the discharge frequency of the arrester, which is used for energy storage and power supply and data wireless transmission by adopting the leakage current of the arrester.
Background
The intelligent monitoring of a metal oxide arrester (hereinafter referred to as an arrester) is an important component of an intelligent substation. The obvious sign of the deterioration of the arrester is the obvious increase of leakage current and resistive current, so that the change conditions of the leakage current and the resistive current of the arrester are monitored in real time, and the real-time monitoring of the running state of the arrester and the early effective early warning of faults are realized. The conventional lightning arrester monitor is connected to a substation power supply system and transmits operation data of the lightning arrester through a signal line, so that a power supply cable and a signal cable are laid in the site construction of the substation, the construction difficulty is high, the construction cost is high, and the operation reliability is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an intelligent sensor device for monitoring an arrester based on the internet of things, wherein the leakage current of the arrester is used for energy storage and power supply and data wireless transmission, so that the acquisition, storage and analysis of the leakage current and the discharge frequency of the arrester and the periodic transmission of the leakage current, the resistive current and the discharge frequency data are realized.
In order to achieve the purpose, the invention adopts the technical scheme that:
an intelligent arrester monitoring sensor based on the Internet of things comprises a large-current protection circuit, a charging current transformer, a counter circuit, a sampling current transformer, a charging circuit, a power supply switching circuit, a lithium battery, an RTC real-time clock, an amplifying circuit, a processor circuit, an LCD display module, a human body induction module, a wireless communication module and an antenna; the method is characterized in that:
the input end of the high-current protection circuit is communicated with the HV port, and the output end of the high-current protection circuit is grounded;
one end of the charging current transformer input interface is communicated with the HV port, the other end of the charging current transformer input interface is communicated with the counter input end, and the output interface is communicated with the charging circuit input end;
the output end of the charging circuit is communicated with the power supply switching circuit;
the lithium battery is communicated with the power supply switching circuit;
the power supply switching circuit is composed of an amplifying circuit, a processor circuit, an RTC real-time clock, a wireless communication module, an LCD display module and a human body induction module, and the output end of the amplifying circuit is communicated with the processor circuit; the processor circuit is in bidirectional communication with the RTC real-time clock; the processor circuit is in bidirectional communication with the wireless communication module; the LCD display module is communicated with the processor circuit; the human body induction module is communicated with the processor circuit;
the output end of the counter circuit is communicated with the processor circuit;
the input interface of the sampling current transformer is communicated with the counter circuit, the other end of the sampling current transformer is grounded, and the output end of the sampling current transformer is communicated with the input end of the amplifying circuit;
the wireless communication module is communicated with the antenna.
Furthermore, the large-current protection circuit is composed of a transient voltage suppression diode D4, a transient voltage suppression diode D9, a high-power resistor R11 and a voltage dependent resistor RV 1.
Further, the charging current transformer is composed of a current transformer T1.
Furthermore, the charging circuit is composed of a bridge stack D3, a resistor R10, a voltage stabilizing diode D5 and an energy storage capacitor C5.
Further, the power switching circuit is composed of a chip U1, a chip U2, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2.
Further, the lithium battery is composed of BT 1.
Further, the counter circuit is composed of a resistor R2, a bridge stack D6, a voltage dependent resistor RV2, a voltage dependent resistor RV3, a capacitor C6, a diode D8 and a relay RL 1.
Further, the sampling current transformer consists of a current transformer T2, a resistor R13, a resistor R14 and a diode D7.
Furthermore, the amplifying circuit is composed of a chip U6, a chip U7, a resistor R6, a resistor R7, a resistor R8 and a resistor R9.
Further, the processor circuit is composed of a chip U3, a chip U4, a resistor R3, a resistor R4, a resistor R5, a capacitor C3, a light emitting diode D1, a light emitting diode D2 and a terminal BR 1.
The RTC real-time clock consists of a chip U8, a crystal Y1, a resistor R15 and a resistor R16.
Furthermore, the LoRaWAN wireless communication circuit in the wireless communication module is composed of an SMA radio frequency antenna socket P1, a LoRaWAN module U5 and a capacitor C4.
Further, the LCD display module is composed of a display module U9, a triode Q1, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and a potentiometer R21.
Further, the human body induction module is composed of a human body infrared induction module S1.
The invention has the beneficial effects that:
under the arrester running state, gather, save and analysis arrester leakage current and discharge number of times through the on-line mode, obtain resistive current through the harmonic analysis to leakage current, realize arrester running state real-time supervision and the early effective early warning of trouble, satisfy the demand that the arrester is quick, safe, convenient, effective detection, solved not enough that current arrester monitoring devices exists, provide the guarantee for the safe and stable operation of arrester. The intelligent sensor device for monitoring the lightning arrester adopts a passive and wireless intelligent design, so that the site construction work of the transformer substation is greatly simplified, and an effective solution is provided for intelligent monitoring of the lightning arrester of a newly-built transformer substation and intelligent reconstruction of the lightning arrester of an already-put-into-operation transformer substation.
Drawings
FIG. 1 is a schematic diagram of the overall composition of the present invention;
FIG. 2 is a schematic diagram of the circuit of the present invention;
FIG. 3 is a circuit diagram of a signal acquisition portion of the present invention;
FIG. 4 is a circuit diagram of a portion of the amplifier of the present invention;
FIG. 5 is a circuit diagram of a portion of the power switching circuit of the present invention;
FIG. 6 is a circuit diagram of a portion of the processor circuit of the present invention;
FIG. 7 is a circuit diagram of a wireless transmission module of the present invention;
FIG. 8 is a circuit diagram of an RTC real time clock of the present invention;
FIG. 9 is a circuit diagram of an LCD display module according to the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and examples.
As shown in fig. 1, an intelligent arrester monitoring sensor based on the internet of things comprises a large-current protection circuit, a charging current transformer, a counter circuit, a sampling current transformer, a charging circuit, a power switching circuit, a lithium battery, an RTC real-time clock, an amplification circuit, a processor circuit, an LCD display module, a human body induction module, a wireless communication module and an antenna; the method is characterized in that:
the input end of the high-current protection circuit is communicated with the HV port, and the output end of the high-current protection circuit is grounded;
one end of the charging current transformer input interface is communicated with the HV port, the other end of the charging current transformer input interface is communicated with the counter input end, and the output interface is communicated with the charging circuit input end;
the output end of the charging circuit is communicated with the power supply switching circuit;
the lithium battery is communicated with the power supply switching circuit;
the power supply switching circuit is composed of an amplifying circuit, a processor circuit, an RTC real-time clock, a wireless communication module, an LCD display module and a human body induction module, and the output end of the amplifying circuit is communicated with the processor circuit; the processor circuit is in bidirectional communication with the RTC real-time clock; the processor circuit is in bidirectional communication with the wireless communication module; the LCD display module is communicated with the processor circuit; the human body induction module is communicated with the processor circuit;
the output end of the counter circuit is communicated with the processor circuit;
the input interface of the sampling current transformer is communicated with the counter circuit, the other end of the sampling current transformer is grounded, and the output end of the sampling current transformer is communicated with the input end of the amplifying circuit;
the wireless communication module is communicated with the antenna.
When a large current flows through the sensor device, the large current protection circuit performs overvoltage protection on the input ports of the charging current transformer and the sampling current transformer and introduces the large current into the grounding end.
The charging current transformer induces a leakage current signal of the lightning arrester and outputs the leakage current signal to the charging circuit;
the charging circuit carries out bridge rectification, diode voltage stabilization and capacitor energy storage on the input leakage current signal, converts the leakage current signal into direct current voltage, outputs the direct current voltage to the power supply switching circuit and then supplies power to each functional module of the sensor device;
the power supply switching circuit compares the direct-current voltage input by the charging circuit with the lithium battery voltage, realizes automatic seamless switching of the working power supply of the sensor device, and supplies power to the amplifying circuit, the processor circuit, the RTC real-time clock, the wireless communication module, the LCD display module and the human body induction module;
the counter circuit performs bridge rectification and filtering on an input leakage current signal, outputs direct current voltage to drive a relay to act, and outputs a dry contact on-off signal to an IO port of the processor circuit;
the sampling current transformer senses a leakage current signal of the lightning arrester and outputs the leakage current signal to the amplifying circuit;
the amplifying circuit amplifies an input leakage current signal according to a set gain and outputs the amplified leakage current signal to an AD (analog-to-digital) sampling port of the processor circuit;
the processor circuit performs periodic acquisition on input leakage current signals and main contact signals, performs discharge frequency statistics through the action state of the main contact, deducts fundamental wave data of the leakage current through Fourier transform to obtain harmonic current data serving as resistive current, and outputs the leakage current, the resistive current and the discharge frequency data to the wireless communication module through the serial port;
the wireless communication module encrypts received data and sends the encrypted data to the monitoring IED in real time through the antenna;
the RTC real-time clock provides a real-time clock for the intelligent lightning arrester monitoring sensor device and is used as time data for sending monitoring data; receiving timing of the monitoring IED through the wireless communication module;
when the human body induction module monitors the intelligent sensor device for the human body approaching the lightning arrester, a fixed level signal is output to an IO port of the processor circuit;
when the LCD display module detects that a human body approaches through the processor circuit, the processor circuit outputs leakage current, resistive current and discharge frequency data to the LCD display module for data display;
the communication mode of the intelligent lightning arrester monitoring sensor device can be LoRaWAN, NBiot and other wireless interfaces;
when the lightning arrester monitoring intelligent sensor device detects that the discharge frequency is changed, leakage current, resistive current and discharge frequency data are immediately sent to the monitoring IED; otherwise, detecting and sending leakage current, resistive current and discharge frequency data to the monitoring IED according to a set period, and enabling the idle time sensor device to be in a low power consumption state.
The large-current protection circuit consists of a transient voltage suppression diode D4, a transient voltage suppression diode D9, a high-power resistor R11 and a voltage dependent resistor RV 1; the transient voltage suppression diode D4 is SMBJ28CA, the transient voltage suppression diode D9 is SMBJ7.5CA, the high-power resistor R11 is 2.4K omega/50W, and the piezoresistor RV1 is 20D 180K.
The charging current transformer consists of a current transformer T1, and the current transformer T1 is PT 101C.
The charging circuit consists of a bridge stack D3, a resistor R10, a voltage stabilizing diode D5 and an energy storage capacitor C5; the bridge stack D3 is KBL10, the resistor R10 is 5 Ω, the zener diode D5 is 1N4733, and the energy storage capacitor C5 is 0.33 uF.
The power supply switching circuit consists of a chip U1, a chip U2, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2; the chip U1 and the chip U2 are LM66100DCK, the resistor R1 and the resistor R2 are 1.2M omega, the capacitor C1 is 0.1uF, and the capacitor C2 is 10 uF.
The lithium battery is composed of a lithium battery BT1, and the lithium battery BT1 is TL-5930.
The counter circuit consists of a resistor R2, a bridge stack D6, a voltage dependent resistor RV2, a voltage dependent resistor RV3, a capacitor C6, a diode D8 and a relay RL 1; the resistor R2 is 8 omega/50W, the bridge stack D6 is KBL10, the piezoresistor RV2 is 10D101K, the piezoresistor RV3 is 20D121K, the capacitor C6 is 6.8uF, the diode D8 is 1N4007, and the relay RL1 is HF115/024-1ZS 1.
The sampling current transformer consists of a current transformer T2, a resistor R13, a resistor R14 and a diode D7; the current transformer T2 is HWGS-21, the resistor R13 and the resistor R14 are 100 omega, and the diode D7 is BAT 54S.
The amplifying circuit consists of a chip U6, a chip U7, a resistor R6, a resistor R7, a resistor R8 and a resistor R9; the chip U6 is LM358ID, the chip U7 is 74LVC1G3157DBVR, the resistor R6 is 0 Ω, the resistor R7 is 150 Ω, the resistor R8 is 10K Ω, and the resistor R9 is 30K Ω.
The processor circuit is composed of a chip U3, a chip U4, a resistor R3, a resistor R4, a resistor R5, a capacitor C3, a light-emitting diode D1, a light-emitting diode D2 and a terminal BR 1; the chip U3 is STC8H8K64U, the chip U4 is REF2033, the resistor R3 and the resistor R4 are 1K Ω, the resistor R5 is 10K Ω, the capacitor C3 is 0.1uF, the light emitting diode D1 and the light emitting diode D2 are QEC113, and the terminal BR1 is EC381 VM-03P.
The RTC real-time clock consists of a chip U8, a crystal Y1, a resistor R15 and a resistor R16; the chip U8 is PCF8563T, the crystal Y1 is 32.768KHz, and the resistor R15 and the resistor R16 are 10K omega.
The LoRaWAN wireless communication circuit in the wireless communication module consists of an SMA radio frequency antenna socket P1, a LoRaWAN module U5 and a capacitor C4; the SMA radio frequency antenna socket P1 is SMA-KEW, the LoRaWAN module U5 is E78-400M22S, and the capacitor C4 is 0.1 uF.
The LCD display module consists of a display module U9, a triode Q1, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and a potentiometer R21; the display module U9 is WYM12232B, the triode Q1 is 1GW, the resistor R17 is 10K Ω, the resistor R18 is 4.7K Ω, the resistor R19 is 1.1K Ω, the resistor R20 is 8.2 Ω, and the potentiometer R21 is 1K Ω.
The human body induction module consists of a human body infrared induction module S1, and the human body infrared induction module S1 is ZDR-09.
As shown in fig. 2, the human body sensing module comprises a module1, a module2, a module3, a module4, a module5, a module6, a module7, a lithium battery BT1 and a human body sensing module S1; the module1 is a circuit diagram of a signal acquisition part of the sensor device, including FIG. 3; module2 is a partial circuit diagram of the amplifier portion of the sensor device, including fig. 4; the module3 is a partial circuit diagram of a power switching circuit of the sensor device, including FIG. 5; module4 is a partial circuit diagram of a sensor device processor circuit, including fig. 6; module5 is a sensor device wireless transmission module circuit diagram, including FIG. 7; module6 is a sensor device RTC real time clock circuit diagram, including FIG. 8; module7 is a sensor device LCD display module circuit diagram, including FIG. 9; the lithium battery BT1 is a lithium battery TL-5930, and the human body induction module S1 is a human body infrared induction module ZDR-09. Module1 is connected with module2 by adopting an analog current port, module1 is connected with module4 by adopting an IO port, module1 is connected with module3 by adopting an analog voltage port, module2 is connected with module4 by adopting an analog voltage port and an IO port, module3 is connected with module4 by adopting an IO port, module4 is connected with module5 by adopting a serial interface, module4 is connected with module6 by adopting an IIC interface, module4 is connected with module7 by adopting an IO port, the positive electrode of lithium battery BT1 is connected with module3 voltage port B _3V, the negative electrode of lithium battery 1 is connected with a ground signal, a pin S1 BT 2 is connected with module4 IO port SENS, a human body induction module S1 is connected with VCC _5V pin 1, and a human body induction module 463 signal is connected with a human body induction pin 1S 3; the lightning arrester monitoring intelligent sensor device circuit general schematic diagram is formed.
As shown in fig. 3, the signal acquisition part circuit is composed of a current transformer T1, a current transformer T2, a bridge stack D3, a bridge stack D6, a transient voltage suppression diode D4, a transient voltage suppression diode D9, a zener diode D5, a diode D7, a diode D8, a varistor RV1, a varistor RV2, a varistor RV3, a resistor R10, a high-power resistor R11, a high-power resistor R12, a resistor R13, a resistor R14, an energy storage capacitor C5, a capacitor C6 and a relay RL 1. Pin 1 of a current transformer T1 is connected with an input port HV _ IN, one end of a transient voltage suppression diode D4 and one end of a piezoresistor RV1, pin 2 of the current transformer T1 is connected with the other end of a transient voltage suppression diode D4, the other end of the piezoresistor RV1, one end of a high-power resistor R11 and one end of a high-power resistor R12, pin 3 of the current transformer T1 is connected with pin 3 of a bridge stack D3, pin 4 of the current transformer T1 is connected with pin 2 of the bridge stack D3, pin 1 of the bridge stack D3 is connected with one end of a resistor R10, pin 4 of the bridge stack D3 is connected with one end of a voltage stabilizing diode D5, one end of an energy storage capacitor C5 and A5 5, the other end of the resistor R5 is connected with the other end of a voltage stabilizing diode D5, the other end of an energy storage capacitor C5 and A5 5, pin 1 of the current transformer T5 is connected with pin 1 of a resistor R5, pin 2 of the current transformer T5 is connected with one end of a resistor R5, pin 3 of the current transformer T5 is connected with pin 1, pin 2 and W _ C _ 72, pin 2 of the current transformer D5, and the pin 3 of the diode D5 are connected with the current transformer D _ C _ X _ Y _ X _ Y, pin 4 of a current transformer T2 is connected with pin 3 and W _ C + of a diode D7, one end of a high-power resistor R11 is connected with one end of a resistor R13 and one end of a transient voltage suppression diode D9, one end of a transient voltage suppression diode D9 is connected with a ground signal, one end of a resistor R14 is connected with a ground signal, one end of a high-power resistor R12 is connected with pin 2 of a bridge stack D6, pin 1 of a bridge stack D6 is connected with one end of a capacitor C6, one end of a piezoresistor RV2, one end of a diode D8 and pin 1 of a relay RL1, pin 3 of the bridge stack D6 is connected with a piezoresistor RV3 ground signal in series, pin 4 of the bridge stack D6 is connected with one end of a capacitor C6, one end of a piezoresistor RV2, one end of a diode D8 and pin 2 of the relay RL1, pin 3 of the relay RL1 is connected with RL, and pin 4 of the relay 1 is connected with Counter +.
As shown in fig. 4, the amplifier section circuit is composed of a chip U6, a chip U7, a resistor R6, a resistor R7, a resistor R8, and a resistor R9. Pin 1 of a chip U6 is connected with one end of a pin 5 and a resistor R7, pin 2 of a chip U6 is connected with the other end of a resistor R7 and W _ C-, pin 3 of the chip U6 is connected with W _ C + and Vref _1.65V, pin 4 of a chip U6 is connected with a ground signal, pin 6 of a chip U6 is connected with one end of a resistor R6, one end of a resistor R8 and one end of a resistor R9, pin 7 of the chip U6 is connected with pin 4 of a chip U7 and W _ Current, pin 8 of the chip U6 is connected with AVCC _5V, pin 1 of the chip U7 is connected with the other end of a resistor R9, pin 2 of the chip U7 is connected with a ground signal, pin 3 of the chip U7 is connected with the other end of the resistor R6, pin 5 of the chip U7 is connected with AVCC _5V, pin 6 of the chip U7 is connected with Switch _1, and the other end of the resistor R8 is connected with Vref _ 1.65V.
As shown in fig. 5, the power supply switching circuit portion circuit is composed of a chip U1, a chip U2, a resistor R1, a resistor R2, a capacitor C1, and a capacitor C2. Pin 1 of chip U1 is connected with C _5V, pin 2 of chip U1 is connected with a ground signal, pin 3 of chip U1 is connected with B _3V, pin 4 of chip U1 is not connected, pin 5 of chip U1 is connected with VCC _5V in series resistor R1, pin 6 of chip U1 is connected with VCC _5V, pin 1 of chip U2 is connected with B _3V, pin 2 of chip U2 is connected with a ground signal, pin 3 of chip U2 is connected with C _5V, pin 4 of chip U2 is not connected, pin 5 of chip U2 is connected with VCC _5V in series resistor R2, pin 6 of chip U2 is connected with VCC _5V, and capacitor C1 and capacitor C2 are connected in parallel between VCC _5V and a ground signal.
As shown in fig. 6, the processor circuit portion circuit is composed of a chip U3, a chip U4, a resistor R3, a resistor R4, a resistor R5, a capacitor C3, a light emitting diode D1, a light emitting diode D2, and a terminal BR 1. Pin 1, pin 7, pin 8, pin 12, pin 14, pin 18, pin 23, pin 24, pin 25, pin 29, pin 32, pin 41, pin 42, and pin 48 of the chip U3 are not connected, pin 2 of the chip U3 is connected to LCD _ DB5, pin 3 of the chip U3 is connected to LCD _ DB6, pin 4 of the chip U3 is connected to LCD _ DB7, pin 5 of the chip U3 is connected to MCU _ RXD _2, pin 6 of the chip U3 is connected to MCU _ TXD _2, pin 9 of the chip U3 is connected to pin 1 of the chip U4, pin 10 of the chip U3 is connected to W _ Current, pin 11 of the chip U3 is connected to Switch 9, pin 13 of the chip U3 is connected to ground signal of capacitor C3 in series, pin 15 of the chip U3 is connected to VCC _5V, pin 16 of the chip U3 is connected to pin 5 of the chip U4, pin 17 of the chip U3 is connected to ground signal in series, pin 19 of the chip U3 BR terminal 19, pin 19 of the chip U1 is connected to ground signal series, pin 20 of the pin BR 1V of, And is connected with Counter, chip U3 pin 22 is connected with INT1, chip U3 pin 26 is connected with ST1, chip U3 pin 27 is connected with ST2, chip U3 pin 28 is connected with SENS, chip U3 pin 30 is connected with one end of resistor R4, chip U3 pin 31 is connected with one end of resistor R3, chip U3 pin 33 is connected with LCD _ DISP, chip U3 pin 34 is connected with LCD _ A0, chip U3 pin 35 is connected with LCD _ RnW, chip U3 pin 36 is connected with LCD _ E2, chip U3 pin 37 is connected with I2C _ SDA, chip U3 pin 38 is connected with I2C _ SCL, chip U3 pin 39 is connected with LCD _ E1, chip U1 pin 40 is connected with LCD _ nDB, chip U1 pin 43 is connected with LCD _ DB1, chip U1 pin 44 is connected with LCD _ DB1, chip U1 pin RST 1 is connected with LCD _ DB pin RST 1, chip U1 pin is connected with chip U1, chip U1 pin 1 is connected with chip U1, chip U1 _ DB pin 19 _ DB signal connection with chip U1, chip U1 is connected with chip U1, chip U1 and chip U1 is connected with chip U1 Pin 4 is connected to VCC _5V, pin 3 is connected to BR1 for ground signal, one terminal of led D1 is connected to one terminal of resistor R3, the other terminal of led D1 is connected to ground signal, one terminal of led D2 is connected to one terminal of resistor R4, and the other terminal of led D2 is connected to ground signal.
As shown in fig. 7, the wireless transmission module circuit is composed of an SMA radio frequency antenna socket P1, a LoRaWAN module U5 and a capacitor C4. Pin 1, pin 10, pin 12, pin 13, pin 14, pin 15 and pin 24 of the LoRaWAN module U5 are connected with ground signals, pin 2 of the LoRaWAN module U5 is connected with VCC _5V, pin 11 of the LoRaWAN module U5 is connected with the central end of an SMA radio frequency antenna socket P1, pin 16 of the LoRaWAN module U5 is connected with a capacitor C4 ground signal in series, pin 20 of the LoRaWAN module U5 is connected with LORA _ RX, pin 21 of the LoRaWAN module U5 is connected with LORA _ TX, the peripheral port of the SMA radio frequency antenna socket P1 is connected with ground signals, and pin 3, pin 4, pin 5, pin 6, pin 7, pin 8, pin 9, pin 17, pin 18, pin 19, pin 22 and pin 23 of the LoRaWAN module U5 are not connected.
As shown in FIG. 8, the RTC real-time clock circuit is composed of a chip U8, a crystal Y1, a resistor R15 and a resistor R16. Pin 1 of a chip U8 is connected with one end of a crystal Y1, pin 2 of a chip U8 is connected with the other end of a crystal Y1, pin 3 of the chip U8 is connected with a resistor R15 in series to be connected with VCC _5V and RTC _ nINT, pin 4 of the chip U8 is connected with a ground signal, pin 5 of the chip U8 is connected with a resistor R16 in series to be connected with VCC _5V and RTC _ SDA, pin 6 of the chip U8 is connected with RTC _ SCL, pin 7 of the chip U8 is not connected, and pin 8 of the chip U8 is connected with VCC _ 5V.
As shown in fig. 9, the LCD display module circuit is composed of a display module U9, a transistor Q1, a resistor R17, a resistor R18, a resistor R19, a resistor R20, and a potentiometer R21. Chip U pin 1 is connected with VCC _5V, chip U pin 2 is connected with ground signal, chip U pin 3 is connected with one end of potentiometer R, chip U pin 4 is connected with resistor R in series to connect VCC _5V and LCD _ nRST, chip U pin 5 is connected with LCD _ E, chip U pin 6 is connected with LCD _ E, chip U pin 7 is connected with LCD _, chip U pin 8 is connected with LCD _ A, chip U pin 9 is connected with LCD _ DB, chip U pin 10 is connected with LCD _ DB, chip U pin 11 is connected with LCD _ DB, chip U pin 12 is connected with LCD _ DB, chip U pin 13 is connected with LCD _ DB, chip U pin 14 is connected with LCD _ DB, chip U pin 15 is connected with LCD _ DB, chip U pin 16 is connected with LCD _ DB, chip U pin 17 is connected with VCC _5V, chip U pin 18 is connected with collector of triode Q, base of triode Q is connected with one end of R and R, an emitter of the triode Q1 is connected with an R20 ground signal in series, one end of the resistor R18 is connected with the LCD _ DISP, one end of the resistor R19 is connected with a ground signal, one end of the potentiometer R21 is connected with VCC _5V, and the other end of the potentiometer R21 is connected with the ground signal.
Claims (2)
1. An intelligent arrester monitoring sensor based on the Internet of things comprises a large-current protection circuit, a charging current transformer, a counter circuit, a sampling current transformer, a charging circuit, a power supply switching circuit, a lithium battery, an RTC real-time clock, an amplifying circuit, a processor circuit, an LCD display module, a human body induction module, a wireless communication module and an antenna; the method is characterized in that:
the input end of the high-current protection circuit is communicated with the HV port, and the output end of the high-current protection circuit is grounded;
one end of the charging current transformer input interface is communicated with the HV port, the other end of the charging current transformer input interface is communicated with the counter input end, and the output interface is communicated with the charging circuit input end;
the output end of the charging circuit is communicated with the power supply switching circuit;
the lithium battery is communicated with the power supply switching circuit;
the power supply switching circuit is composed of an amplifying circuit, a processor circuit, an RTC real-time clock, a wireless communication module, an LCD display module and a human body induction module, and the output end of the amplifying circuit is communicated with the processor circuit; the processor circuit is in bidirectional communication with the RTC real-time clock; the processor circuit is in bidirectional communication with the wireless communication module; the LCD display module is communicated with the processor circuit; the human body induction module is communicated with the processor circuit;
the output end of the counter circuit is communicated with the processor circuit;
the input interface of the sampling current transformer is communicated with the counter circuit, the other end of the sampling current transformer is grounded, and the output end of the sampling current transformer is communicated with the input end of the amplifying circuit;
the wireless communication module is communicated with the antenna.
2. The intelligent arrester monitoring sensor based on the Internet of things as claimed in claim 1, wherein:
the large-current protection circuit consists of a transient voltage suppression diode D4, a transient voltage suppression diode D9, a high-power resistor R11 and a voltage dependent resistor RV 1;
the charging current transformer consists of a current transformer T1;
the charging circuit consists of a bridge stack D3, a resistor R10, a voltage stabilizing diode D5 and an energy storage capacitor C5;
the power supply switching circuit consists of a chip U1, a chip U2, a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2;
the lithium battery consists of BT 1;
the counter circuit consists of a resistor R2, a bridge stack D6, a voltage dependent resistor RV2, a voltage dependent resistor RV3, a capacitor C6, a diode D8 and a relay RL 1;
the sampling current transformer consists of a current transformer T2, a resistor R13, a resistor R14 and a diode D7;
the amplifying circuit consists of a chip U6, a chip U7, a resistor R6, a resistor R7, a resistor R8 and a resistor R9;
the processor circuit is composed of a chip U3, a chip U4, a resistor R3, a resistor R4, a resistor R5, a capacitor C3, a light-emitting diode D1, a light-emitting diode D2 and a terminal BR 1;
the RTC real-time clock consists of a chip U8, a crystal Y1, a resistor R15 and a resistor R16;
the LoRaWAN wireless communication circuit in the wireless communication module consists of an SMA radio frequency antenna socket P1, a LoRaWAN module U5 and a capacitor C4;
the LCD display module consists of a display module U9, a triode Q1, a resistor R17, a resistor R18, a resistor R19, a resistor R20 and a potentiometer R21;
the human body induction module consists of a human body infrared induction module S1.
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| CN202110631875.1A CN113295979A (en) | 2021-06-07 | 2021-06-07 | Arrester monitoring intelligent sensor based on Internet of things |
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| CN202110631875.1A CN113295979A (en) | 2021-06-07 | 2021-06-07 | Arrester monitoring intelligent sensor based on Internet of things |
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Cited By (1)
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| CN115932648A (en) * | 2022-12-30 | 2023-04-07 | 西安远测电力科技有限公司 | Wireless intelligent sensor device for monitoring resistive current of lightning arrester |
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