Three-phase four-wire cost control intelligent electric energy meter based on IR46 standard

Abstract

The invention discloses a three-phase four-wire cost control intelligent electric energy meter based on an IR46 standard, which comprises a shell, a light guide type liquid crystal display screen, a USB (Universal Serial Bus) interface, an auxiliary wiring terminal strip and a main wiring terminal strip are arranged on the surface of the shell, and a metering core module, a management core module, a power supply module, a relay and a mutual inductor are arranged in the shell. A terminal temperature measuring element is arranged on the main wiring terminal strip in the shell; the power supply module is electrically connected with the metering core module and the management core module; and power supply isolation modules are arranged between the metering core module and the power supply module and between the management core module and the power supply module. The system has the advantages that the whole machine is composed of a metering core, a management core, a communication module and other modules, and the design thought that the metering core module and the management core module are mutually independent is adopted; the on-site inspection frequency can be effectively reduced, and high economic benefits and social benefits are achieved; the intelligent power grid construction demand is responded, and the reliability and stability of electric power utilization are ensured.

Description

Technical Field:

[0001] The present invention relates to a three-phase four-wire fee-controlled intelligent electricity meter based on the IR46 standard in the field of electric power metering. Background Art:

[0002] Intelligent electricity meters are mainly used as metering devices. After ten years of promotion, they have successfully realized the transformation of power supply enterprises from manual meter reading to automated and intelligent meter reading, obtaining more detailed and accurate electricity consumption data. However, they do not yet have the characteristics of separating metering performance and management functions, high-resolution storage of big data, load identification, high-speed information processing, and communication. Therefore, carrying out modular design based on the IR46 standard, separating the software and hardware of the metering part and other parts, and enabling new functions to be flexibly configured for later-developed modules is the need for the development of the power market.

[0003] IR46: International Recommendation 46, the international recommendation for active energy meters. Summary of the Invention:

[0004] The purpose of the present invention is to provide a three-phase four-wire fee-controlled intelligent electricity meter based on the IR46 standard with the separation of software and hardware between the metering part and other parts.

[0005] The present invention is implemented by the following technical solutions: A three-phase four-wire fee-controlled intelligent electricity meter based on the IR46 standard, which includes a housing. On the surface of the housing, there are a light-guided liquid crystal display, a USB interface, an auxiliary wiring terminal block, a main wiring terminal block, and a communication module from top to bottom. Inside the housing, there are a metering core module, a management core module, a power supply module, a relay, and a current transformer. On the main wiring terminal block inside the housing, there is a terminal temperature measuring element; the power supply module is electrically connected to the metering core module and the management core module; power isolation modules are provided between the metering core module and the management core module and the power supply module; the metering unit of the metering core module is electrically connected to the current transformer, and the current transformer is electrically connected to the main wiring terminal block; the terminal temperature measuring element and the relay are both electrically connected to the metering core MCU of the metering core module. The terminal temperature measuring element transmits temperature information to the metering core MCU, and the metering core MCU controls the relay; the metering core MCU and the management core MCU of the management core module are connected by SPI communication, with the management core module as the master and the metering core module as the slave; the management core MCU is connected to the USB interface, and an expansion module is detachably plugged on the USB interface; the management core MCU is optically isolated and electrically connected to the auxiliary wiring terminal block; the uplink communication module is connected to the management core MCU by UART communication.

[0006] Preferably, the metering core module includes the metering core MCU and the metering unit.

[0007] Preferably, the management core module includes the management core MCU and the Bluetooth communication module; the management core MCU is electrically connected to the light guide type liquid crystal display screen.

[0008] Preferably, a backup power supply electrically connected to the metering core MCU is provided inside the housing, and the backup power supply is a peripheral power supply or a super capacitor.

[0009] Preferably, the terminals on the auxiliary wiring terminal block are connected by reed pieces.

[0010] Preferably, the expansion module includes a load identification module, an orderly charging module, and a downlink module, all of which interact with the management core MCU in a serial port manner; among them, in addition to the general interface, the load identification module also communicates with the metering core MCU to obtain the original voltage, current, and AD values of the metering core MCU, and the communication uses the SPI interface communication.

[0011] Preferably, the terminal temperature measuring element is a PN junction temperature sensor.

[0012] Advantages of the present invention: Compared with the prior art, the whole machine is composed of a metering core, a management core, a communication module, and other modules, adopting the design idea of mutual independence between the metering core module and the management core module; the metering core module realizes the legal metering function and conducts data interaction with the management core module; the management core module realizes functions such as display, external communication, event recording, data freezing, and load control, and is an intermediate component connecting the metering core module and the expansion module; the software of the management core can be remotely upgraded, can monitor the metering performance and terminal temperature, effectively solve problems such as metering inaccuracy monitoring and electricity use safety; can effectively reduce the on-site inspection frequency, and has high economic and social benefits; responds to the needs of smart grid construction and ensures the reliability and stability of power consumption. Brief description of the drawings:

[0013] Figure 1 It is a schematic diagram of the panel of the present invention.

[0014] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0015] Figure 3 It is a wiring schematic diagram of the main wiring terminal block.

[0016] Figure 4 It is a wiring schematic diagram of the auxiliary wiring terminal block.

[0017] Figure 5 It is a connection schematic diagram of the management core module of the present invention.

[0018] Figure 6 Schematic diagram of the connection between the metering core MCU and the present invention. Specific implementation manner:

[0019] Embodiment:

[0020] As Figures 1 to 6 shown, a three-phase four-wire fee-controlled intelligent electricity meter based on the IR46 standard includes a housing. On the surface of the housing 1, there are a light-guided liquid crystal display screen 25, an auxiliary wiring terminal row 3, and a main wiring terminal row 4 arranged from top to bottom.

[0021] The terminals on the auxiliary wiring terminal row 3 are connected by reed pieces; inside the housing 1, there are a metering core module 6, a management core module 7, a power supply module 8, a relay 9, and a current transformer 10.

[0022] The metering core module 6 includes a metering core MCU61 and a metering unit.

[0023] The management core module 7 includes a management core MCU71 and a Bluetooth communication module 72. The Bluetooth communication module 72 supports interconnection and interoperability, and its communication service follows the UUID standard protocol; the Bluetooth communication module supports a two-master and three-slave working mode and supports concurrent data communication with 2 hosts and 3 slaves at the same time; when the Bluetooth communication module communicates, the metering performance of the electricity meter, the stored metering data and parameters will not be affected or changed; the Bluetooth MAC address adopts a static address in the Bluetooth random address type and corresponds one-to-one with the communication address of the electricity meter, and the Bluetooth of the electricity meter has strong anti-interference ability and good compatibility; the management core MCU71 is electrically connected to the light-guided liquid crystal display screen 2.

[0024] The power supply module 8 is electrically connected to the metering core module 6 and the management core module 7; a power isolation module is provided between the metering core module 6 and the management core module 7 and the power supply module 8; the metering unit of the metering core module 6 is electrically connected to the current transformer 10, and the current transformer 10 is electrically connected to the main wiring terminal block 4; a terminal temperature measuring element 11 is provided on the main wiring terminal block 4 in the housing 1, and the terminal temperature measuring element 11 is a PN junction temperature sensor, with a temperature measurement range of +25°C to +150°C and a temperature measurement error not exceeding ±5°C; the time interval between two temperature measurements of any wiring terminal does not exceed 5 s; both the terminal temperature measuring element 11 and the relay 9 are electrically connected to the metering core MCU 61, and the terminal temperature measuring element 11 transmits temperature information to the metering core MCU; the metering core MCU 61 controls the relay; the metering core MCU 61 and the management core MCU 71 are connected by SPI communication, with the management core module 7 as the master and the metering core module 6 as the slave; the management core MCU 71 is connected to the USB interface, and an expansion module 12 is detachably plugged into the USB interface; the expansion module 12 includes a load identification module, an orderly charging module, and a downlink module, all of which interact with the management core MCU in a serial port manner; among them, in addition to the general interface, the load identification module also communicates with the metering core MCU to obtain the original voltage, current, and AD values of the metering core MCU, and the communication uses an SPI interface; the management core MCU is optically isolated and electrically connected to the auxiliary wiring terminal block; the communication module 5 is connected to the management core MCU 71 by UART communication, and the communication module 5 is mainly used for power meter data communication and supports communication methods such as carrier wave and micro-power wireless; the communication module 5 and the management core MCU 71 use a serial port full-duplex communication mode, with a default communication rate of 9600 bps and a maximum support of 115200 bps. The communication module is built-in with an energy storage device and can complete an active power outage report within 3 minutes; a backup power supply 13 electrically connected to the metering core MCU 61 is provided in the housing 1, and the backup power supply 13 is an external power supply or a super capacitor. The backup power supply 13 enables the power meter to continue working for several minutes after a power outage to report the power outage event and prepare for shutdown.

Claims

1. A three-phase four-wire fee-controlled intelligent electric energy meter based on the IR46 standard, characterized in that, it includes a housing, on the surface of the housing, there are a light-guided liquid crystal display screen, a USB interface, an auxiliary wiring terminal row, a main wiring terminal row, and a communication module from top to bottom. Inside the housing, there are a metering core module, a management core module, a power supply module, a relay, and a mutual inductor. On the main wiring terminal row inside the housing, there is a terminal temperature measuring element; the power supply module is electrically connected to the metering core module and the management core module; between the metering core module and the management core module and the power supply module, there are power isolation modules; the metering unit of the metering core module is electrically connected to the mutual inductor, and the mutual inductor is electrically connected to the main wiring terminal row; the terminal temperature measuring element and the relay are both electrically connected to the metering core MCU of the metering core module. The terminal temperature measuring element transmits temperature information to the metering core MCU, and the metering core MCU controls the relay; the metering core MCU and the management core MCU of the management core module are connected by SPI communication; the management core MCU is connected to the USB interface, and an expansion module is detachably plugged on the USB interface; the management core MCU is optically isolated and electrically connected to the auxiliary wiring terminal row; the communication module is connected to the management core MCU by UART communication.

2. A three-phase four-wire fee-controlled intelligent electric energy meter based on the IR46 standard according to claim 1, characterized in that, the metering core module includes the metering core MCU and the metering unit.

3. A three-phase four-wire fee-controlled intelligent electric energy meter based on the IR46 standard according to claim 1, characterized in that, the management core module includes the management core MCU and a Bluetooth communication module; the management core MCU is electrically connected to the light-guided liquid crystal display screen.

4. A three-phase four-wire fee-controlled intelligent electric energy meter based on the IR46 standard according to claim 1, characterized in that, inside the housing, there is a backup power supply electrically connected to the metering core MCU, and the backup power supply is an external power supply or a super capacitor.

5. A three-phase four-wire fee-controlled intelligent electric energy meter based on the IR46 standard according to claim 1, characterized in that, the terminals on the auxiliary wiring terminal row are connected by reed switches.

6. A three-phase four-wire fee-controlled intelligent electric energy meter based on the IR46 standard according to claim 1, characterized in that, the expansion module includes a load identification module, an orderly charging module, and a downlink module, all of which interact with the management core MCU in a serial port manner; among them, in addition to the general interface, the load identification module also communicates with the metering core MCU to obtain the original voltage, current, and AD values of the metering core MCU, and the communication uses an SPI interface.

7. A three-phase four-wire fee-controlled intelligent electric energy meter based on the IR46 standard according to claim 1, characterized in that, the terminal temperature measuring element is a PN junction temperature sensor.

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