CN115663655A - Uninterrupted meter replacing device - Google Patents

Abstract

The invention discloses a meter replacing device without power outage, which belongs to the technical field of electric power and comprises a core control panel A1, wherein the core control panel A1 comprises an MCU (microprogrammed control Unit), an AC-DC (alternating current-direct current) circuit, a phase sampling circuit, a temperature sampling circuit, an electric parameter acquisition circuit, an input-output circuit, a COM (component object model) port circuit and a USB (universal serial bus) interface circuit, so that the technical problem of replacing a meter without power outage by detecting the phase of three-phase power is solved. The short-circuit device of the uninterrupted meter changing device can provide a safe and reliable short-circuit scheme for uninterrupted meter changing, so that a user side does not have power failure during meter changing. The accurate metering module of the whole process of the meter changing without power outage can complete the electric quantity compensation work, and the user power consumption data acquired by the metering module of the device can be accurately stored during the meter changing period.

Description

A meter changing device without power failure

technical field

The invention belongs to the technical field of electric power, and in particular relates to a meter changing device without power failure.

Background technique

Replacing the energy meter is one of the methods for the power supply company to ensure the normal operation of the energy metering device and the accurate transmission of information collection. When the single-phase electric energy meter is aging or fails, the operator needs to replace it. In the past, it took at least 15 minutes for operators to replace a single electric energy meter, and the operation required a power outage in the residents' homes. This is time-consuming and labor-intensive and affects the normal electricity consumption of customers.

Contents of the invention

The object of the present invention is to provide a meter replacement device without power failure, which solves the technical problem of realizing meter replacement without power failure by detecting the phases of three-phase electricity.

In order to achieve the above object, the present invention adopts the following technical scheme: a device for changing meters without power failure, including a core control board A1, and the core control board A1 includes an MCU, an AC-DC circuit, a phase sampling circuit, a temperature sampling circuit, and an electrical parameter acquisition circuit , input and output circuit, COM port circuit and USB interface circuit, phase sampling circuit, temperature sampling circuit, electrical parameter acquisition circuit, input and output circuit, COM port circuit and USB interface circuit are all electrically connected to MCU, and AC-DC circuit is MCU, Power supply for phase sampling circuit, temperature sampling circuit, electrical parameter acquisition circuit, input and output circuit, COM port circuit and USB interface circuit;

The input end of the AC-DC circuit is connected to the three-phase power connected to the input end of the incoming switch K1 in the user meter box. The three-phase power includes A-phase power, B-phase power, C-phase power and N-phase power. The phase sampling circuit passes through The input terminal of the AC-DC circuit collects the phase signal of the three-phase electricity, and the temperature sampling circuit is connected to an external temperature sensor;

The input and output circuit includes a contactor control unit, a button unit and a buzzer unit. The contactor control unit, the button unit and the buzzer unit are all electrically connected to the MCU. The contactor control unit is used to control the external contactor, and the button unit is used for Provide the MCU with the start switch signal and the close switch signal. The buzzer unit includes a switch signal isolation drive circuit composed of an optocoupler U64 and a transistor D63, which is used to drive an external buzzer to sound an alarm;

The USB interface circuit includes a FLASH module U21, a USB module U20 and their peripheral circuits. Both the FLASH module U21 and the USB module U20 are electrically connected to the MCU, and the USB module U20 provides a USB interface for connecting an external U disk;

The COM port circuit includes a communication module U10 and its peripheral circuits, and the communication module U10 is used to provide a serial communication interface;

The electric parameter collection circuit is used to collect the electric signal output by the input end of the outlet switch K2 in the meter box.

Preferably, the electric parameter collection circuit collects the electric signal output from the input terminal of the outlet switch K2 in the meter box through a current transformer CT.

Preferably, the AC-DC unit, the first voltage regulator unit and the second voltage regulator unit, the AC-DC unit is composed of an inductor T1, an interface P1, an AC-DC module U1 and its peripheral circuits, and 5 of the interface P1 Pin, pin 4, and pin 3 are connected to phase C, phase B, and phase A respectively. Set the electrical signal of phase C as phase C C PHASE, and the electrical signal of phase B as phase B B phase and phase A The electrical signal is A phase A PHASE, the 2 pins of the interface P1 are connected to the neutral line output by the output end of the outlet switch K2 in the user meter box, and the neutral line is set as the neutral line EX_N, and the 1 pin is connected to the zero line in the user meter box. The live wire output by the output terminal of the outlet switch K2 is set as the live wire COM_PHASE; the 3rd pin of the inductor T1 is connected to the 5th pin of the interface P1 through the series connected fuse F1 and the interface P2, and the 1st pin of the inductor T1 is connected to the neutral line EX_N, Pin 4 and pin 2 of inductor T1 are connected to the input terminal of AC-DC module U1, and the output terminal of AC-DC module U1 outputs 12V power supply;

Interface P2 is connected to an external switch;

Both the input terminal of the first voltage regulator unit and the input terminal of the second voltage regulator unit are connected to a 12V power supply, the first voltage regulator unit outputs a VCC power supply, and the second voltage regulator unit outputs a 3.3V power supply;

The VCC power supply provides driving voltage for the COM port circuit and the USB interface circuit.

Preferably, the contactor control unit includes a phase A contactor control unit, a B phase contactor control unit and a C phase contactor control unit, and the A phase contactor control unit includes a terminal P60, a resistor R62, an optocoupler U60, a relay K60, transistor D61, resistor R64 and resistor R65, pin 1 of optocoupler U60 is connected to 3.3V power supply, pin 2 is connected to an IO port of MCU through resistor R62, pin 3 is connected to the base of triode D61 through resistor R64, pin 4 is connected to 12V Power supply, one end of the coil of the relay K60 is connected to the 12V power supply, the other end is connected to the collector of the triode D61, the emitter of the triode D61 is connected to the ground wire, one end of the resistor R65 is connected to the base of the triode D61, and the other end is connected to the emitter of the triode D61 , the common end of the relay D60 is connected to the neutral line EX_N, pin 2 of the normally open terminal P60, and pin 1 of the terminal P60 is connected to pin 3 of the inductance T1;

Terminal P60 is connected to the external multi-circuit line control relay K4, which is used to control the multi-circuit line control relay K4 to switch the A-phase power;

The circuit principle structure of the B-phase contactor control unit and the C-phase contactor control unit is the same as that of the A-phase contactor control unit;

The B-phase contactor control unit is connected to the external multi-circuit line control relay K4 through the terminal P63, and is used to control the multi-circuit line control relay K4 to switch the B-phase power;

The C-phase contactor control unit is connected to the external multi-circuit line control relay K4 through the terminal P65, and is used to control the multi-circuit line control relay K4 to switch the C-phase power;

Described button unit comprises interface P61, interface P62, resistance R63, resistance R66, optocoupler U61, optocoupler U62, resistance R60 and resistance R61, 1 foot of interface P61 and 1 foot of interface P62 are all connected to ground wire, the 1 foot of interface P61 Pin 2 is connected to pin 2 of optocoupler U61 through resistor R62, pin 2 of interface P62 is connected to pin 2 of optocoupler U62 through resistor R66, pin 1 of optocoupler U61 and pin 1 of optocoupler U62 are connected to 12V power supply, and pin 1 of optocoupler U61 Pin 3 and pin 3 of optocoupler U62 are connected to the ground wire, pin 4 of optocoupler U61 and pin 4 of optocoupler U62 are respectively connected to different IO ports of the MCU, resistor R60 and resistor R61 are pin 4 of optocoupler U61 and pin 4 of optocoupler U62 The pull-up resistor on the pin 4, the interface P61 and the interface P62 are respectively connected with two external buttons for providing the start switch signal and the close switch signal.

Preferably, the phase sampling circuit includes a resistor R40, a resistor R43, a resistor R44, a resistor R47, a resistor R48, a resistor R51, a resistor R52, a resistor R55, a rectifier D40, a rectifier D41, a rectifier D42, a rectifier D43, a resistor R42, a resistor R46, a resistor R50, resistor R54, optocoupler U40, optocoupler U42, optocoupler U43, optocoupler U44, resistor R41, resistor R45, resistor R49, resistor R53 and AND gate U41, and gate U41 includes AND gate U41C, AND gate U41B, and Gate U41A and AND gate U41D, pin 4 of the rectifier D40 connects pin 3 and pin 2 of interface P1 through resistor R43, pin 2 and pin 3 of the interface P1 connect to pin 2 and pin 1 of the optocoupler U40 through resistor R42 Pin 1 of optocoupler U40, pin 4 of optocoupler U40 is connected to pin 9 of AND gate 41, pin 3 is connected to ground wire, resistor R41 is the pull-up resistor of pin 4 of optocoupler U40, pin 8 of AND gate U41 is connected to AND gate Pin 11 of U41;

Pin 4 of rectifier D41 is connected to pin 4 of interface P1 through resistor R44, pin 2 is connected to pin 2 of interface P1 through resistor R47, pin 3 is connected to pin 2 of optocoupler U42, pin 1 is connected to pin 1 of optocoupler U42 through resistor R46, Pin 4 of the optocoupler U42 is connected to pin 4 of the AND gate 41, and pin 3 is connected to the ground wire, resistor R45 is a pull-up resistor for pin 4 of the optocoupler U42, pin 5 of the AND gate U41 is connected to pin 11 of the AND gate U41;

Pin 4 of rectifier D42 is connected to pin 5 of interface P1 through resistor R48, pin 2 is connected to pin 2 of interface P1 through resistor R51, pin 3 is connected to pin 2 of optocoupler U43, pin 1 is connected to pin 1 of optocoupler U43 through resistor R50, Pin 4 of the optocoupler U43 is connected to pin 1 and pin 3 of the gate 41 to ground, resistor R49 is a pull-up resistor for pin 4 of the optocoupler U43, pin 2 of the AND gate U41 is connected to pin 11 of the gate U41;

Pin 4 of rectifier D43 is connected to pin 1 of interface P1 through resistor R52, pin 2 is connected to pin 2 and pin 3 of interface P1 through resistor R55 to pin 2 of optocoupler U44, pin 1 is connected to pin 1 of optocoupler U44 through resistor R54, Pin 4 of optocoupler U44 is connected to pin 12 and pin 13 of gate 41, pin 3 is connected to the ground wire, resistor R53 is the pull-up resistor of pin 4 of optocoupler U44, pin 11, pin 3, pin 6 of gate U41 and The 8 pins are respectively connected to different IO ports of the MUC. Preferably, the electrical parameter acquisition circuit includes an interface P31, an interface P32, an optocoupler U33, and an electric energy metering module U32, pins 7 and 6 of the electric energy metering module U32 are respectively connected to pins 2 and 1 of the interface P31, and the electric energy metering module U32 The 4 pins of the optocoupler U33 are connected to the 3.3V power supply, the 3 pins and 2 pins are respectively connected to different IO ports of the MCU, the 1 pin is connected to the 1 pin of the optocoupler U33, the 5 pins are connected to the ground wire, the 2 pins of the optocoupler U33 are connected to the ground wire, and the 3 pins Pin 1 and pin 4 are respectively connected to pin 1 and pin 2 of the interface P32, and the interface P31 is connected to the current transformer CT.

Preferably, the temperature sampling circuit includes a first temperature sensor interface unit, a second temperature sensor interface unit, a third temperature sensor interface unit and a fourth temperature sensor interface unit, and the first temperature sensor interface unit includes an interface J30, a resistor R30 and Capacitor C30, pin 2 of the interface J30 is connected to an IO port of the MCU, pin 1 is connected to the ground wire, resistor R30 is a pull-up resistor on pin 2 of the interface J30, and capacitor C30 is a filter capacitor for pin 2 of the interface J30;

The circuit principle structures of the second temperature sensor interface unit, the third temperature sensor interface unit and the fourth temperature sensor interface unit are all the same as those of the first temperature sensor interface unit.

Preferably, for the STM32F103C8T6, the model of the FLASH module U21 is W25Q128JVSIQ, the model of the USB module U20 is CH376T, and the model of the communication module U10 is MAX3232ESE.

Preferably, the incoming line end of the multi-circuit line control relay K4 is connected to the three-phase power connected to the input end of the incoming line switch K1; The output terminal of the outlet switch K2.

The non-stop meter changing device of the present invention solves the technical problem of realizing the non-stop meter changing by detecting the phase of three-phase electricity. Replace the single-phase smart meter on the low-voltage side. The short-circuit device of the non-power-off meter replacement device can provide a safe and reliable short-circuit solution for non-power-off meter replacement, so that the user side does not have power supply during the meter replacement. The precise metering module in the whole process of meter replacement without power outage can complete the electricity replenishment work, ensuring that the user's electricity consumption data collected by the device's own metering module during meter replacement can be accurately stored, and the power company can perform power replenishment based on this data, so that the power company Losses during meter changes are minimized. The non-power-off meter replacement device integrates the above research contents, provides available equipment for the meter replacement operation, and ensures the operability, safety, efficiency and accuracy of the non-power-off meter replacement.

Description of drawings

Fig. 1 is a schematic block diagram of the present invention;

Fig. 2 is the circuit diagram of AC-DC circuit of the present invention;

Fig. 3 is the circuit diagram of phase sampling circuit of the present invention;

Fig. 4 is the circuit diagram of temperature sampling circuit of the present invention;

Fig. 5 is the circuit diagram of electric parameter acquisition circuit of the present invention;

Fig. 6 is the circuit diagram of the contactor control unit of the present invention;

Fig. 7 is the circuit diagram of the button unit of the present invention;

Fig. 8 is the circuit diagram of the buzzer unit of the present invention;

Fig. 9 is a circuit diagram of the COM port circuit of the present invention;

Fig. 10 is the USB interface circuit of the present invention;

Fig. 11 is the MCU circuit diagram of the present invention;

Fig. 12 is a wiring diagram between the present invention and the user meter box and the external circuit line control relay in practical application.

Detailed ways

A non-power-off meter replacement device shown in Figure 1-Figure 12 includes a core control board A1, and the core control board A1 includes an MCU, an AC-DC circuit, a phase sampling circuit, a temperature sampling circuit, an electrical parameter acquisition circuit, input and output Circuit, COM port circuit and USB interface circuit, phase sampling circuit, temperature sampling circuit, electrical parameter acquisition circuit, input and output circuit, COM port circuit and USB interface circuit are all electrically connected to MCU, and AC-DC circuit is MCU, phase sampling circuit , temperature sampling circuit, electrical parameter acquisition circuit, input and output circuit, COM port circuit and USB interface circuit power supply;

The input end of the AC-DC circuit is connected to the three-phase power connected to the input end of the incoming switch K1 in the user meter box. The three-phase power includes A-phase power, B-phase power, C-phase power and N-phase power. The phase sampling circuit passes through The input terminal of the AC-DC circuit collects the phase signal of the three-phase electricity, and the temperature sampling circuit is connected to an external temperature sensor;

In this embodiment, the temperature sensor adopts an NTC temperature sensor, the MCU is provided with an internal AD conversion, and the temperature sensor is connected to the AD interface of the MCU.

The input and output circuit includes a contactor control unit, a button unit and a buzzer unit. The contactor control unit, the button unit and the buzzer unit are all electrically connected to the MCU. The contactor control unit is used to control the external contactor, and the button unit is used for Provide the MCU with the start switch signal and the close switch signal. The buzzer unit includes a switch signal isolation drive circuit composed of an optocoupler U64 and a transistor D63, which is used to drive an external buzzer to sound an alarm;

The USB interface circuit includes a FLASH module U21, a USB module U20 and their peripheral circuits. Both the FLASH module U21 and the USB module U20 are electrically connected to the MCU, and the USB module U20 provides a USB interface for connecting an external U disk;

The COM port circuit includes a communication module U10 and its peripheral circuits, and the communication module U10 is used to provide a serial communication interface;

The electric parameter collection circuit is used to collect the electric signal output by the input end of the outlet switch K2 in the meter box.

The electric parameter collection circuit collects the electric signal output by the input end of the outlet switch K2 in the meter box through a current transformer CT.

In this embodiment, in the actual use process, the user's electric meter box includes an incoming line switch K1, an outgoing line switch K2, and an ammeter WH. The input terminal is connected to the outlet terminal of the ammeter, and the output terminal outputs the neutral line EX_N and the live line COM_PHASE.

The wiring in the user's meter box is prior art, so it will not be described in detail.

The current transformer CT is set on the live line COM_PHASE.

The AC-DC unit, the first voltage regulator unit and the second voltage regulator unit, the AC-DC unit is composed of an inductor T1, an interface P1, an AC-DC module U1 and its peripheral circuits, and the 5 pins and 4 pins of the interface P1 Pin and pin 3 are respectively connected to C phase C PHASE, B phase BPHASE and A phase A phase, pin 2 of interface P1 is connected to the neutral line EX_N output by the output terminal of outlet switch K2 in the user meter box, and pin 1 is connected to the user meter box The live wire COM_PHASE output by the output terminal of the outlet switch K2 inside; the 3rd pin of the inductor T1 is connected to the 5th pin of the interface P1 through the fuse F1 connected in series and the interface P2, the 1st pin of the inductor T1 is connected to the neutral line EX_N, and the 4th pin of the inductor T1 Pin and pin 2 are connected to the input terminal of AC-DC module U1, and the output terminal of AC-DC module U1 outputs 12V power supply;

The interface P2 is connected to an external switch, which is the power switch of the core control board A1.

Both the input terminal of the first voltage regulator unit and the input terminal of the second voltage regulator unit are connected to a 12V power supply, the first voltage regulator unit outputs a VCC power supply, and the second voltage regulator unit outputs a 3.3V power supply;

The VCC power supply provides driving voltage for the COM port circuit and the USB interface circuit.

The contactor control unit includes a phase A contactor control unit, a B phase contactor control unit and a C phase contactor control unit, and the A phase contactor control unit includes a terminal P60, a resistor R62, an optocoupler U60, a relay K60, and a triode D61, resistor R64 and resistor R65, pin 1 of optocoupler U60 is connected to 3.3V power supply, pin 2 is connected to an IO port of MCU through resistor R62, pin 3 is connected to the base of triode D61 through resistor R64, pin 4 is connected to 12V power supply, relay One end of the coil of K60 is connected to the 12V power supply, the other end is connected to the collector of the triode D61, the emitter of the triode D61 is connected to the ground wire, one end of the resistor R65 is connected to the base of the triode D61, the other end is connected to the emitter of the triode D61, and the relay D60 The common end of the terminal is connected to the neutral line EX_N, pin 2 of the normally open terminal P60, and pin 1 of the terminal P60 is connected to pin 3 of the inductor T1;

Terminal P60 is connected to the external multi-circuit line control relay K4, which is used to control the multi-circuit line control relay K4 to switch the A-phase power;

The circuit principle structure of the B-phase contactor control unit and the C-phase contactor control unit is the same as that of the A-phase contactor control unit;

The B-phase contactor control unit is connected to the external multi-circuit line control relay K4 through the terminal P63, and is used to control the multi-circuit line control relay K4 to switch the B-phase power;

The C-phase contactor control unit is connected to the external multi-circuit line control relay K4 through the terminal P65, and is used to control the multi-circuit line control relay K4 to switch the C-phase power.

In this embodiment, a bypass power supply box can be set next to the user's meter box during the process of changing the meter, and the multi-circuit line control relay K4 and the core control board A1 can be set in the bypass power supply box for convenience. Make the wiring.

The incoming line end of the multi-circuit line control relay K4 is connected to the three-phase electricity connected to the input end of the incoming line switch K1 , C-phase electricity, B-phase electricity, A-phase electricity and N-phase electricity.

The outlet end of the multi-circuit line control relay K4 is connected to the output end of the outlet switch K2 in the user meter box, that is, the neutral wire EX_N and the fire wire COM_PHASE.

Described button unit comprises interface P61, interface P62, resistance R63, resistance R66, optocoupler U61, optocoupler U62, resistance R60 and resistance R61, 1 foot of interface P61 and 1 foot of interface P62 are all connected to ground wire, the 1 foot of interface P61 Pin 2 is connected to pin 2 of optocoupler U61 through resistor R62, pin 2 of interface P62 is connected to pin 2 of optocoupler U62 through resistor R66, pin 1 of optocoupler U61 and pin 1 of optocoupler U62 are connected to 12V power supply, and pin 1 of optocoupler U61 Pin 3 and pin 3 of optocoupler U62 are connected to the ground wire, pin 4 of optocoupler U61 and pin 4 of optocoupler U62 are respectively connected to different IO ports of the MCU, resistor R60 and resistor R61 are pin 4 of optocoupler U61 and pin 4 of optocoupler U62 The pull-up resistor on the 4 pin, the interface P61 and the interface P62 are respectively connected to two external buttons, which can be used to provide the connection START signal and the disengagement STOP signal, and the connection START signal and the disengagement STOP signal are all switching signals.

Phase sampling circuit includes resistor R40, resistor R43, resistor R44, resistor R47, resistor R48, resistor R51, resistor R52, resistor R55, rectifier D40, rectifier D41, rectifier D42, rectifier D43, resistor R42, resistor R46, resistor R50, resistor R54, optocoupler U40, optocoupler U42, optocoupler U43, optocoupler U44, resistor R41, resistor R45, resistor R49, resistor R53 and AND gate U41, AND gate U41 includes AND gate U41C, AND gate U41B, AND gate U41A and AND gate U41D, pin 4 of rectifier D40 is connected to pin 3 and pin 2 of interface P1 through resistor R43, pin 2 and pin 3 of interface P1 are connected to pin 2 and pin 1 of optocoupler U40 are connected to pin 2 and pin 1 of optocoupler U40 through resistor R42 Pin 1 of optocoupler U40, pin 4 of optocoupler U40 is connected to pin 9 of gate 41, pin 3 is connected to the ground wire, resistor R41 is the pull-up resistor of pin 4 of optocoupler U40, pin 8 of gate U41 is connected to pin 11 of gate U41 foot;

Pin 4 of rectifier D41 is connected to pin 4 of interface P1 through resistor R44, pin 2 is connected to pin 2 of interface P1 through resistor R47, pin 3 is connected to pin 2 of optocoupler U42, pin 1 is connected to pin 1 of optocoupler U42 through resistor R46, Pin 4 of the optocoupler U42 is connected to pin 4 of the AND gate 41, and pin 3 is connected to the ground wire, resistor R45 is a pull-up resistor for pin 4 of the optocoupler U42, pin 5 of the AND gate U41 is connected to pin 11 of the AND gate U41;

Pin 4 of rectifier D42 is connected to pin 5 of interface P1 through resistor R48, pin 2 is connected to pin 2 of interface P1 through resistor R51, pin 3 is connected to pin 2 of optocoupler U43, pin 1 is connected to pin 1 of optocoupler U43 through resistor R50, Pin 4 of the optocoupler U43 is connected to pin 1 and pin 3 of the gate 41 to ground, resistor R49 is a pull-up resistor for pin 4 of the optocoupler U43, pin 2 of the AND gate U41 is connected to pin 11 of the gate U41;

Pin 4 of rectifier D43 is connected to pin 1 of interface P1 through resistor R52, pin 2 is connected to pin 2 and pin 3 of interface P1 through resistor R55 to pin 2 of optocoupler U44, pin 1 is connected to pin 1 of optocoupler U44 through resistor R54, Pin 4 of optocoupler U44 is connected to pin 12 and pin 13 of gate 41, pin 3 is connected to the ground wire, resistor R53 is the pull-up resistor of pin 4 of optocoupler U44, pin 11, pin 3, pin 6 of gate U41 and The 8 pins are respectively connected to different IO ports of the MUC.

During use, pin 4 of rectifier D40, pin 4 of rectifier D41 and pin 4 of rectifier D42 are used to collect phase data of phase A, phase B and phase C respectively, while pin 4 of rectifier D43 is used to collect The phase of the live wire COM_PHASE is compared with the logic AND circuit formed by the AND gate U41C, the AND gate U41B, the AND gate U41A and the AND gate U41D. When the enable signal is generated according to the same phase, the MCU can use the A phase corresponding to the enable signal The contactor control unit, the C-phase contactor control unit and the B-phase contactor control unit carry out corresponding control, so as to realize the control of the circuit line control relay, for example, when the phase A of the A-phase electricity collected by the 4 pin of the rectifier D40 When the PHASE signal is the same as the phase signal of the live wire COM_PHASE collected by the 4 pin of the rectifier D43, in the logic and circuit, U41C outputs a high level signal, that is, INTA. At this time, after the MCU monitors the INTA signal, it controls the phase A contactor control unit Perform an action to close the relay K60, so that the pin 2 of the interface P60 is connected to the neutral line EX_N. Since the pin 1 of the interface P60 is connected to the pin 3 of the inductor T1, the power supply voltage can be obtained through the interface P2 and the fuse F1 (in this implementation In the example, the C-phase C PUASE is used to provide the working voltage), at this time, the multi-circuit line control relay K4 can obtain the control voltage through the interface P60, and switch the A-phase line.

In this embodiment, the multi-circuit line control relay K4 can also be replaced by three circuit line control relays, and these three circuit line control relays are used to control the A-phase line switching, the B-phase line switching and the C-phase line respectively. Switching, these three circuit line control relays are respectively controlled by the phase A contactor control unit, the phase B contactor control unit and the phase C contactor control unit.

The electrical parameter acquisition circuit includes an interface P31, an interface P32, an optocoupler U33 and an electric energy metering module U32, and pins 7 and 6 of the electric energy metering module U32 are respectively connected to pins 2 and 1 of the interface P31, and pin 4 of the electric energy metering module U32 Connect to 3.3V power supply, connect pin 3 and pin 2 to different IO ports of MCU, pin 1 connect to pin 1 of optocoupler U33, pin 5 connect to ground wire, pin 2 of optocoupler U33 connect to ground wire, pin 3 and pin 4 Connect pin 1 and pin 2 of interface P32 respectively, and interface P31 connects current transformer CT.

In this embodiment, the model of the electric energy metering module U32 is IM1281B.

The electric energy metering module U32 can directly measure the electric energy data at the outgoing line of the electric meter WH through the current transformer CT, and display it on the display screen.

The temperature sampling circuit includes a first temperature sensor interface unit, a second temperature sensor interface unit, a third temperature sensor interface unit and a fourth temperature sensor interface unit, the first temperature sensor interface unit includes an interface J30, a resistor R30 and a capacitor C30, Pin 2 of the interface J30 is connected to an IO port of the MCU, pin 1 is connected to the ground wire, the resistor R30 is the pull-up resistor on the pin 2 of the interface J30, and the capacitor C30 is the filter capacitor of the pin 2 of the interface J30;

The circuit principle structures of the second temperature sensor interface unit, the third temperature sensor interface unit and the fourth temperature sensor interface unit are all the same as those of the first temperature sensor interface unit.

The model of the STM32F103C8T6, the FLASH module U21 is W25Q128JVSIQ, the model of the USB module U20 is CH376T, and the model of the communication module U10 is MAX3232ESE.

In this embodiment, as shown in FIG. 9 , the serial communication interface of the communication module U10 includes two, one is the interface P10 connected to the code scanner; the other is the interface P11 connected to the touch screen or display screen.

In this embodiment, during the normal process of changing the meter, after confirming that the wiring of the multi-circuit line control relay K4 is correct, press the button connected to the interface P2 to send a start signal, and the core control board A1 will automatically judge the input and output The phase sequence of the terminal, and then by controlling the multi-circuit line control relay K4 to perform corresponding switching, so as to enter the correct working state, the screen displays "connection is correct", at this time, the staff can perform related maintenance and replace the meter.

During normal operation, in this embodiment, a display screen can be installed on the bypass meter box, which is used to display the voltage value, current value, and temperature value of the connection pile of the line connector, and record the current connection work. The display screen can communicate with the core control board A1 through the 232 serial port bus, read and display the display data, and the staff can effectively judge whether the access circuit is normal based on these data. If the access circuit is suddenly abnormal during the construction process, the main control module will issue an instruction to reset the line relay and disconnect the access circuit to ensure the safety of construction personnel.

After the construction is completed, start the disengagement button, that is, the STOP switch signal obtained from the optocoupler U62, the host will immediately reset the wire control relay, and disconnect from the power supply circuit of the device, and the staff will remove the line connector.

The non-stop meter changing device of the present invention solves the technical problem of realizing the non-stop meter changing by detecting the phase of three-phase electricity. Replace the single-phase smart meter on the low-voltage side. The short-circuit device of the non-power-off meter replacement device can provide a safe and reliable short-circuit solution for non-power-off meter replacement, so that the user side does not have power supply during the meter replacement. The precise metering module in the whole process of meter replacement without power outage can complete the electricity replenishment work, ensuring that the user's electricity consumption data collected by the device's own metering module during meter replacement can be accurately stored, and the power company can perform power replenishment based on this data, so that the power company Losses during meter changes are minimized. The non-power-off meter replacement device integrates the above research contents, provides available equipment for the meter replacement operation, and ensures the operability, safety, efficiency and accuracy of the non-power-off meter replacement.

Claims (9)

1. A meter changing device without power failure, characterized in that: it includes a core control board A1, and the core control board A1 includes an MCU, an AC-DC circuit, a phase sampling circuit, a temperature sampling circuit, an electrical parameter acquisition circuit, an input and output circuit, a COM port circuit and USB interface circuit, phase sampling circuit, temperature sampling circuit, electrical parameter acquisition circuit, input and output circuit, COM port circuit and USB interface circuit are all electrically connected to MCU, and the AC-DC circuit is MCU, phase sampling circuit, temperature sampling circuit power supply circuit, electric parameter acquisition circuit, input and output circuit, COM port circuit and USB interface circuit; The input end of the AC-DC circuit is connected to the three-phase power connected to the input end of the incoming switch K1 in the user meter box. The three-phase power includes A-phase power, B-phase power, C-phase power and N-phase power. The phase sampling circuit passes through The input terminal of the AC-DC circuit collects the phase signal of the three-phase electricity, and the temperature sampling circuit is connected to an external temperature sensor; The input and output circuit includes a contactor control unit, a button unit and a buzzer unit. The contactor control unit, the button unit and the buzzer unit are all electrically connected to the MCU. The contactor control unit is used to control the external contactor, and the button unit is used for Provide the MCU with the start switch signal and the close switch signal. The buzzer unit includes a switch signal isolation drive circuit composed of an optocoupler U64 and a transistor D63, which is used to drive an external buzzer to sound an alarm; The USB interface circuit includes a FLASH module U21, a USB module U20 and their peripheral circuits. Both the FLASH module U21 and the USB module U20 are electrically connected to the MCU, and the USB module U20 provides a USB interface for connecting an external U disk; The COM port circuit includes a communication module U10 and its peripheral circuits, and the communication module U10 is used to provide a serial communication interface; The electric parameter collection circuit is used to collect the electric signal output by the input end of the outlet switch K2 in the meter box. 2. A non-stop meter changing device as claimed in claim 1, characterized in that: the electrical parameter acquisition circuit collects the electrical signal output by the input terminal of the outlet switch K2 in the meter box through a current transformer CT. 3. A non-stop meter changing device as claimed in claim 2, characterized in that: the AC-DC unit, the first voltage regulator unit and the second voltage regulator unit, the AC-DC unit is composed of an inductor T1, The interface P1, AC-DC module U1 and its peripheral circuits are composed. The 5 pins, 4 pins and 3 pins of the interface P1 are respectively connected to the C-phase power, B-phase power and A-phase power, and the electrical signal of the C-phase power is set to C Phase C PHASE, the electrical signal of B-phase electricity is B-phase B PHASE and the electrical signal of A-phase electricity is A-phase A PHASE, and the 2 pins of interface P1 are connected to the neutral line output by the output end of the outlet switch K2 in the user's meter box , set the neutral line as the neutral line EX_N, connect pin 1 to the live wire output by the output terminal of the outlet switch K2 in the user’s meter box, set the live wire to be the live wire COM_PHASE; pin 3 of the inductance T1 is connected in series through the fuse F1 and the interface P2 is connected to pin 5 of interface P1, pin 1 of inductor T1 is connected to neutral line EX_N, pin 4 and pin 2 of inductor T1 are connected to the input terminal of AC-DC module U1, and the output terminal of AC-DC module U1 outputs 12V power supply; Interface P2 is connected to an external switch; Both the input end of the first voltage regulator unit and the input end of the second voltage regulator unit are connected to a 12V power supply, the first voltage regulator unit outputs a VCC power supply, and the second voltage regulator unit outputs a 3.3V power supply; The VCC power supply provides driving voltage for the COM port circuit and the USB interface circuit. 4. A non-stop meter changing device as claimed in claim 3, characterized in that: the contactor control unit includes a phase A contactor control unit, a B phase contactor control unit and a C phase contactor control unit, A The phase contactor control unit includes terminal P60, resistor R62, optocoupler U60, relay K60, transistor D61, resistor R64 and resistor R65, pin 1 of optocoupler U60 is connected to 3.3V power supply, pin 2 is connected to an IO of MCU through resistor R62 Pin 3 is connected to the base of triode D61 through resistor R64, pin 4 is connected to 12V power supply, one end of the coil of relay K60 is connected to 12V power supply, the other end is connected to the collector of triode D61, the emitter of triode D61 is connected to the ground wire, resistor R65 One end is connected to the base of the three-pole D61, the other end is connected to the emitter of the three-pole D61, the common end of the relay D60 is connected to the neutral line EX_N, pin 2 of the normally open terminal P60, pin 1 of the terminal P60 is connected to pin 3 of the inductor T1 ; Terminal P60 is connected to the external multi-circuit line control relay K4, which is used to control the multi-circuit line control relay K4 to switch the A-phase power; The circuit principle structure of the B-phase contactor control unit and the C-phase contactor control unit is the same as that of the A-phase contactor control unit; The B-phase contactor control unit is connected to the external multi-circuit line control relay K4 through the terminal P63, and is used to control the multi-circuit line control relay K4 to switch the B-phase power; The C-phase contactor control unit is connected to the external multi-circuit line control relay K4 through the terminal P65, and is used to control the multi-circuit line control relay K4 to switch the C-phase power; The button unit includes an interface P61, an interface P62, a resistor R63, a resistor R66, an optocoupler U61, an optocoupler U62, a resistor R60, and a resistor R61. The pin 1 of the interface P61 and the pin 1 of the interface P62 are all connected to the ground wire, and the pin 1 of the interface P61 Pin 2 is connected to pin 2 of optocoupler U61 through resistor R62, pin 2 of interface P62 is connected to pin 2 of optocoupler U62 through resistor R66, pin 1 of optocoupler U61 and pin 1 of optocoupler U62 are connected to 12V power supply, and pin 1 of optocoupler U61 Pin 3 and pin 3 of optocoupler U62 are connected to the ground wire, pin 4 of optocoupler U61 and pin 4 of optocoupler U62 are respectively connected to different IO ports of the MCU, resistor R60 and resistor R61 are respectively pin 4 of optocoupler U61 and pin 4 of optocoupler U62 The pull-up resistor on the pin 4, the interface P61 and the interface P62 are respectively connected with two external buttons for providing the start switch signal and the close switch signal. 5. A non-stop meter changing device as claimed in claim 3, wherein the phase sampling circuit includes a resistor R40, a resistor R43, a resistor R44, a resistor R47, a resistor R48, a resistor R51, a resistor R52, a resistor R55, a rectifier D40, Rectifier D41, Rectifier D42, Rectifier D43, Resistor R42, Resistor R46, Resistor R50, Resistor R54, Optocoupler U40, Optocoupler U42, Optocoupler U43, Optocoupler U44, Resistor R41, Resistor R45, Resistor R49, Resistor R53 AND gate U41, AND gate U41 includes AND gate U41C, AND gate U41B, AND gate U41A and AND gate U41D, pin 4 of rectifier D40 is connected to pin 3 of interface P1 through resistor R40, pin 2 of pin 2 of interface P1 is connected to pin 2 of interface P1 through resistor R43 Pin 3 is connected to pin 2 and pin 1 of optocoupler U40 through resistor R42, pin 4 of optocoupler U40 is connected to pin 9 of AND gate 41, pin 3 is connected to the ground wire, resistor R41 is the optocoupler The pull-up resistor on pin 4 of U40 is connected to pin 11 of the AND gate U41 on pin 8 of the AND gate U41; Pin 4 of rectifier D41 is connected to pin 4 of interface P1 through resistor R44, pin 2 is connected to pin 2 of interface P1 through resistor R47, pin 3 is connected to pin 2 of optocoupler U42, pin 1 is connected to pin 1 of optocoupler U42 through resistor R46, Pin 4 of the optocoupler U42 is connected to pin 4 of the AND gate 41, and pin 3 is connected to the ground wire, resistor R45 is a pull-up resistor for pin 4 of the optocoupler U42, pin 5 of the AND gate U41 is connected to pin 11 of the AND gate U41; Pin 4 of rectifier D42 is connected to pin 5 of interface P1 through resistor R48, pin 2 is connected to pin 2 of interface P1 through resistor R51, pin 3 is connected to pin 2 of optocoupler U43, pin 1 is connected to pin 1 of optocoupler U43 through resistor R50, Pin 4 of the optocoupler U43 is connected to pin 1 and pin 3 of the gate 41 to ground, resistor R49 is a pull-up resistor for pin 4 of the optocoupler U43, pin 2 of the AND gate U41 is connected to pin 11 of the gate U41; Pin 4 of rectifier D43 is connected to pin 1 of interface P1 through resistor R52, pin 2 is connected to pin 2 and pin 3 of interface P1 through resistor R55 to pin 2 of optocoupler U44, pin 1 is connected to pin 1 of optocoupler U44 through resistor R54, Pin 4 of optocoupler U44 is connected to pin 12 and pin 13 of gate 41, and pin 3 is connected to the ground wire. Resistor R53 is a pull-up resistor for pin 4 of optocoupler U44, and pin 11, pin 3, and pin 6 of gate U41 are connected to the ground wire. The 8 pins are respectively connected to different IO ports of the MUC. 6. A non-stop meter changing device as claimed in claim 3, characterized in that: said electrical parameter acquisition circuit includes an interface P31, an interface P32, an optocoupler U33 and an electric energy metering module U32, and the 7 pins of the electric energy metering module U32 Pin 2 and pin 6 are respectively connected to pin 2 and pin 1 of the interface P31, pin 4 of the electric energy metering module U32 is connected to a 3.3V power supply, pin 3 and pin 2 are respectively connected to different IO ports of the MCU, pin 1 is connected to pin 1 of the optocoupler U33, Pin 5 is connected to the ground wire, pin 2 of the optocoupler U33 is connected to the ground wire, pin 3 and pin 4 are respectively connected to pin 1 and pin 2 of the interface P32, and the interface P31 is connected to the current transformer CT. 7. A meter exchange device without power failure according to claim 1, characterized in that: said temperature sampling circuit comprises a first temperature sensor interface unit, a second temperature sensor interface unit, a third temperature sensor interface unit and a fourth temperature sensor interface unit. Temperature sensor interface unit, the first temperature sensor interface unit includes an interface J30, a resistor R30 and a capacitor C30, the 2 pins of the interface J30 are connected to an IO port of the MCU, the 1 pin is connected to the ground wire, and the resistor R30 is the upper pin on the 2 pins of the interface J30 The pull resistor and capacitor C30 are the filter capacitor of pin 2 of the interface J30; The circuit principle structures of the second temperature sensor interface unit, the third temperature sensor interface unit and the fourth temperature sensor interface unit are all the same as those of the first temperature sensor interface unit. 8. A non-power-off meter changing device as claimed in claim 1, characterized in that: the STM32F103C8T6, the model of the FLASH module U21 is W25Q128JVSIQ, the model of the USB module U20 is CH376T, and the model of the communication module U10 is MAX3232ESE . 9. A non-stop meter changing device according to claim 4, characterized in that: the incoming line end of the multi-circuit line control relay K4 is connected to the three-phase power supply connected to the input end of the incoming line switch K1. ; The outlet end of the multi-circuit line control relay K4 is connected to the output end of the outlet switch K2 in the user meter box.

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