CN211606073U - Residual current protector - Google Patents
Residual current protector Download PDFInfo
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- CN211606073U CN211606073U CN202020276445.3U CN202020276445U CN211606073U CN 211606073 U CN211606073 U CN 211606073U CN 202020276445 U CN202020276445 U CN 202020276445U CN 211606073 U CN211606073 U CN 211606073U
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Abstract
The utility model relates to a residual current protector. The system comprises a zero sequence transformer, a signal amplifying circuit, a current transformer, a voltage acquisition loop, an electric energy metering circuit, a central processing unit, a display circuit, a communication circuit and a trip execution circuit, wherein the zero sequence transformer acquires the residual current of a circuit, the output of the zero sequence transformer is sent to the signal amplifying circuit, and the output of the signal amplifying circuit is connected with the central processing unit; the current transformer collects current signals, the voltage collecting circuit collects three-phase voltages, the outputs of the current transformer and the voltage collecting circuit are connected with the electric energy metering circuit, and the electric energy metering circuit is also connected with the central processing unit for data exchange; the central processing unit controls the display circuit connected with the central processing unit to display data, the central processing unit is in serial port communication with the outside through the communication circuit connected with the central processing unit, and the central processing unit controls the residual current protector to trip through the trip execution circuit connected with the central processing unit. The utility model discloses can provide reliable basic data for smart power grids.
Description
Technical Field
The utility model relates to a low voltage apparatus field, in particular to residual current protector.
Background
The residual current operated protector is an important protective electric appliance in power distribution in rural power networks, and plays an important role in preventing personal electric shock and fire accidents. Along with the construction of strong smart power grids, the residual current operated protectors are no longer just single-function protectors. The intelligent power consumption monitoring system has the advantages that the microcontroller technology is applied, the functions of remote control, remote regulation, remote measurement and the like are achieved, and various power consumption information of users is adopted to analyze big data and prejudge faults by applying the universal power internet of things technology. The residual current operated protectors on the market at present only have basic residual current protection functions and cannot meet the requirements of the current situation.
SUMMERY OF THE UTILITY MODEL
The utility model aims at not enough to the present technology, provide and have a residual current protector, three-phase voltage, electric current, active and reactive power measurement function with the high accuracy to possess the measurement function basically, provide user's power consumption data source for general electric power thing networking construction.
In order to realize the purpose, the technical scheme of the utility model is as follows:
a residual current protector is characterized by comprising a zero sequence transformer, a signal amplifying circuit, a current transformer, a voltage acquisition loop, an electric energy metering circuit, a central processing unit, a display circuit, a communication circuit and a trip execution circuit, wherein the zero sequence transformer acquires residual current of a circuit, the output of the zero sequence transformer is sent to the signal amplifying circuit, and the output of the signal amplifying circuit is connected with the central processing unit; the current transformer collects current signals, the voltage collecting circuit collects three-phase voltages, the outputs of the current transformer and the voltage collecting circuit are connected with the electric energy metering circuit, and the electric energy metering circuit is also connected with the central processing unit for data exchange; the central processing unit controls the display circuit connected with the central processing unit to display data, the central processing unit is in serial port communication with the outside through the communication circuit connected with the central processing unit, and the central processing unit controls the residual current protector to trip through the trip execution circuit connected with the central processing unit.
The electric energy metering circuit is a special three-phase electric energy metering chip and is connected with the central processing unit through an SPI bus.
The communication circuit is an RS485 interface chip.
The utility model has the advantages that: the metering chip special for the three-phase electric energy is adopted to collect various data of the power line, such as three-phase voltage, current, active power, reactive power and the like, the precision is high, reliable basic data can be provided for a smart grid, the construction of the smart power internet of things is powerfully supported, and the market prospect is good.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is an electrical schematic diagram of an embodiment of the present invention.
Detailed Description
The principles and embodiments of the present invention will be further described with reference to the drawings.
With reference to the attached drawing 1
A residual current protector comprises a zero sequence transformer 1, a signal amplifying circuit 2, a current transformer 4, a voltage acquisition loop 6, an electric energy metering circuit 5, a central processing unit 3, a display circuit 7, a communication circuit 8 and a tripping execution circuit 9. The zero sequence transformer 1 collects the residual current of the circuit, the output of the zero sequence transformer 1 is sent to the signal amplifying circuit 2, and the output of the signal amplifying circuit 2 is connected with the central processing unit 3; the current transformer 4 collects current signals, the voltage collecting circuit 6 collects three-phase voltages, and the outputs of the current transformer and the voltage collecting circuit are connected with the electric energy metering circuit 5. The electric energy metering circuit 5 obtains various data through calculation, and the electric energy metering circuit 5 is connected with the central processing unit 3 through an SPI bus.
The central processing unit 3 controls a display circuit 7 connected with the central processing unit to display various data, the central processing unit 3 is in serial port communication with the outside through a communication circuit 8 connected with the central processing unit, and the central processing unit 3 controls the residual current protector to trip through a trip execution circuit 9 connected with the central processing unit.
With reference to the attached FIG. 2
The zero sequence transformer J1 collects the residual current of the circuit, and the secondary side output of the zero sequence transformer J1 is converted into a voltage signal by a resistor R22.
The signal amplification circuit is composed of diodes D1 and D2, resistors R20, R21, R22, R23, R24, R25, a capacitor C16 and an operational amplifier U3A. The signal amplification circuit filters and amplifies an output signal of the zero sequence transformer J1 and then is connected with the single chip microcomputer U2, and the single chip microcomputer U4 converts the signal into a digital signal to perform the next step of processing.
The central processing unit adopts a singlechip U4, and the singlechip U4 adopts STM8S105S4 of ST company.
The resistors R1, R2, R3, R4, R5, R6 and the capacitors C3, C4 and C5 form three voltage division circuits to form a voltage acquisition circuit, and the alternating current three-phase voltage is subjected to voltage division and filtering and then is sent to the integrated circuit U1.
The current transformers CT1, CT2 and CT3 collect three-phase load current of lines, and the resistors R10, R11, R12, R13, R14 and R15, the capacitors C8, C9 and C10 form a signal conditioning circuit to filter signals and send the signals to the integrated circuit U1.
The electric energy metering circuit 5 is composed of an integrated circuit U1 and a peripheral circuit, wherein the integrated circuit U1 is a high-precision three-phase electric energy special metering chip ATT7022, and capacitors C1, C2, C11 and C12 filter power for the integrated circuit U1. Capacitors C6, C7 and crystal oscillator CR1 form a clock loop to provide clock signals to integrated circuit U1.
The integrated circuit U1 is a high-precision three-phase electric energy special metering chip ATT7022, and integrates a six-path second-order sigma-delta ADC, a reference voltage circuit, and circuits for digital signal processing and the like for measuring all power, energy, effective value, power factor and frequency. The device can measure active power, reactive power, apparent power, functional quantity and reactive energy of each phase and combined phases, and can also measure parameters such as each phase current, voltage effective value, power factor, phase angle, frequency and the like.
The integrated circuit U1 is connected with the single chip microcomputer U4 through an SPI bus, and the single chip microcomputer U4 reads the measurement data of the integrated circuit U1 through the SPI bus.
The display circuit is composed of a liquid crystal display IC1, a capacitor C19 and a capacitor C20, the liquid crystal display IC1 is connected with an IO port of the single chip microcomputer U4, and the single chip microcomputer 42 controls the liquid crystal display IC1 to display various parameters.
The communication circuit adopts an RS485 chip U2, and the U1 is connected with serial port transceiving ends RX and TX of the singlechip U4. And the output ends 485A and 485B of the U1 are connected with a 485 bus of an external power automation network.
The utility model has the advantages that: the metering chip special for the three-phase electric energy is adopted to collect various data of the power line, such as three-phase voltage, current, active power, reactive power and the like, the precision is high, reliable basic data can be provided for a smart grid, the construction of the smart power internet of things is powerfully supported, and the market prospect is good.
Claims (3)
1. A residual current protector is characterized by comprising a zero sequence transformer, a signal amplifying circuit, a current transformer, a voltage acquisition loop, an electric energy metering circuit, a central processing unit, a display circuit, a communication circuit and a trip execution circuit, wherein the zero sequence transformer acquires residual current of a circuit, the output of the zero sequence transformer is sent to the signal amplifying circuit, and the output of the signal amplifying circuit is connected with the central processing unit; the current transformer collects current signals, the voltage collecting circuit collects three-phase voltages, the outputs of the current transformer and the voltage collecting circuit are connected with the electric energy metering circuit, and the electric energy metering circuit is also connected with the central processing unit for data exchange; the central processing unit controls the display circuit connected with the central processing unit to display data, the central processing unit is in serial port communication with the outside through the communication circuit connected with the central processing unit, and the central processing unit controls the residual current protector to trip through the trip execution circuit connected with the central processing unit.
2. The residual current protector according to claim 1, wherein the electric energy metering circuit is a three-phase electric energy dedicated metering chip, and the electric energy metering circuit is connected with the central processing unit by an SPI bus.
3. The residual current protector according to claim 1, wherein the communication circuit is an RS485 interface chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020276445.3U CN211606073U (en) | 2020-03-09 | 2020-03-09 | Residual current protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020276445.3U CN211606073U (en) | 2020-03-09 | 2020-03-09 | Residual current protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211606073U true CN211606073U (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020276445.3U Active CN211606073U (en) | 2020-03-09 | 2020-03-09 | Residual current protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211606073U (en) |
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2020
- 2020-03-09 CN CN202020276445.3U patent/CN211606073U/en active Active
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