CN216056479U - A topology identification nuclear core plate for platform district branch monitoring facilities - Google Patents

Abstract

The utility model discloses a topology identification core board for a branch monitoring device of a transformer area, which relates to the field of topology identification of the transformer area and comprises an MCU unit, an AD sampling receiving unit, an interface unit and a reset unit. The MCU unit is communicated with the identification equipment main MCU through a UART and is communicated with the AD sampling chip; a weak current communication interface connected with an intelligent circuit breaker or a transformer area identification terminal main MCU is arranged on an interface of the external equipment; and carrying out reset operation when communication abnormity occurs. The utility model can realize production automation, has lower requirements on device layout and routing, shortens the development period and reduces the working difficulty of technicians; the volume is small, and the space is effectively saved; the production cost is reduced; the stamp hole scheme is used for the external interface, so that the compatibility is strong, and the stamp hole scheme can be adapted to various platform area terminals; the accuracy of topology identification can be greatly improved. The visual topological relation of the transformer area, the branch, the meter box, the meter, the phase and the user can be realized, and the planning of a power distribution scheme and the calculation of the line loss of the transformer area are realized.

Description

A topology identification nuclear core plate for platform district branch monitoring facilities

Technical Field

The utility model relates to the field of district topology identification, in particular to a topology identification core board applied to district branch monitoring equipment.

Background

The strategic targets of 'three-type two-network and world first-class' are provided by national grid companies, lean management and different loss positioning are realized by analyzing big data by using basic data of a smart grid, and new requirements are provided for the topological relations of marketing and distribution penetrations and power grid 'station-line-variable-household'.

The household change relationship is the power supply attribution relationship between each power utilization client in the transformer area and the power supply transformer of the transformer area. The accuracy of the household variable relationship is very important in the operation of the power marketing business, is the basis of distribution service of the distribution area, is the basis of the planning of the distribution scheme and the line loss calculation of the distribution area, and is the reference for optimizing the power utilization quality of the distribution area. The platform area is used as a terminal level of development and construction of the smart power grid, relates to multiple specialties such as marketing, operation and inspection and the like, is a key point and a difficult point of power grid management work, and is a key point for implementing the 'last kilometer' landing service.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides the topology identification core board for the platform area branch monitoring equipment, which can realize production automation, has lower requirements on device layout and routing, shortens the development period and reduces the working difficulty of technicians; the volume is small, and the space is effectively saved; the production cost is reduced; the stamp hole scheme is used for the external interface, the compatibility is strong, and the stamp hole scheme can be adapted to various station area identification terminals; the accuracy of topology identification can be greatly improved.

The purpose of the utility model can be realized by the following technical scheme:

a topology identification core board for a platform area branch monitoring device comprises an MCU unit, an AD sampling receiving unit, an interface unit and a reset unit. The MCU unit is communicated with the intelligent circuit breaker or the platform area identification terminal main MCU through a UART and is communicated with the AD sampling chip through an SPI; the communication interface mainly has the functions of power supply, reset control, a UART interface and a current analog quantity acquisition interface; the reset unit performs a reset operation when a communication abnormality occurs.

Further, the power supply of the whole core board supplies power for 3.3V direct current and is provided by a circuit breaker or a station area identification terminal.

Further, the topology identification core board and the main MCU adopt serial communication, the topology identification core board is specified to receive host data as downlink communication, and the topology identification core board replies the host data as uplink communication.

Further, the core board uses ATSAMG55 as MCU, main performance: a 32-bit ARM Cortex-M4 kernel with an built-in FPU and a maximum working dominant frequency of 120 MHz; 176KB SRAM, 512KB FLASH; the maximum number of the IO is 48, 8 12-bit ADC input pins are provided, the conversion rate is 500ksps, and the maximum number of the UART/SPI/IIC is supported; 1 USB 2.0.

Further, the AD sampling chip MCP3914, a 24-bit resolution delta-sigma analog-to-digital converter with eight synchronous samples, communicates with the host MCU through the UART port.

Furthermore, the external interface adopts a stamp hole scheme, and 24 pins are distributed on two sides of the topology recognition core board.

Furthermore, the core board has a reset function, after the core board is powered on, the TP _ RST pin defaults to a high level, and the core board works normally. If UART communication abnormity is encountered, reset operation is carried out on the topology identification core board once by pulling down the TP _ RST pin, then the TP _ RST pin is pulled up, and communication is carried out again to confirm whether the core board works normally or not.

Furthermore, the topology identification core board is provided with a serial port for data transmission, parameter setting and program upgrading.

Further, the topology identification core board is provided with three current sampling pins for measuring voltages at two ends of a resistor in the A, B, C three-phase current sampling circuit.

The utility model has the beneficial technical effects that: the utility model has high reliability and stability by adopting the design standard of modularization, expandability, low power consumption and maintenance-free, and can accurately and reliably identify users under the line; the topology identification core board has the functions of current sampling and characteristic current signal identification, and simultaneously supports the functions of loop impedance expansion and topology analysis; the topology recognition core board has excellent electromagnetic compatibility, the working temperature meets the industrial application range, local/remote modification of equipment parameters and software upgrading are supported, the size is light, the application of various intelligent equipment can be met, and the application value is high.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a pin assignment diagram of the present invention.

Fig. 3 is a diagram illustrating a basic scheme of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.

As shown in fig. 1, a topology identification core board for a platform area branch monitoring device includes an MCU unit, an AD sampling receiving unit, an interface unit, and a reset unit, where the MCU unit communicates with an intelligent circuit breaker or a platform area identification terminal main MCU through a UART, and communicates with an AD sampling chip; the communication interface mainly has the functions of power supply, reset control, a UART interface and a current analog quantity acquisition interface; the reset unit performs a reset operation when a communication abnormality occurs.

As shown in fig. 2, the core board has 24 pins, which are distributed on two sides of the core board, and mainly has the functions of power supply, reset control, a UART interface, and a current analog acquisition interface.

As shown in fig. 3, taking an intelligent circuit breaker as an example of an application device, after three current transformers of the circuit breaker pass through sampling resistors, output differential signals are respectively introduced into a topology identification core board, and an ADC chip is used in the core board to perform current data sampling. The MCU of intelligence circuit breaker or platform district low pressure thing allies oneself with perception terminal communicates through the UART mouth with the topology discernment core plate, and core plate has the control signal input that resets simultaneously, can reset core plate when communication is unusual. The utility model can realize stable and reliable long-distance wireless communication in a low-voltage data centralized meter reading system and has stronger practicability.

The PCB adopts a single-side surface mounting process without a hand-inserting device, all test points are placed on a BOT surface, an external interface adopts a stamp hole scheme, a support manufacturer uses a reflow process for welding, the whole volume of the small plate is 20mm x 30mm x 4mm, the size is small, and the small plate can be installed in station area identification terminals such as an intelligent circuit breaker and a concentrator.

The MCU unit is based on an ATSAMG55 series microprocessor of an ARM platform and a 32-bit ARM Cortex-M4 kernel, is internally provided with an FPU (field programmable logic unit), has the maximum working dominant frequency of 120MHz, has larger storage capacity and has enough operation processing capacity.

The power supply of the core board is 3.3V direct current power supply and is supplied by the main equipment through a power supply pin.

The AD sampling receiving unit adopts MCP3914 of Microchip company, and comprises 8 Delta-Sigma analog-to-digital (A/D) converters for synchronously sampling 24 bits of resolution, 8 PGA, a high-speed serial port compatible with 20MHz SPI and a maximum sampling frequency of 4 MHz.

The core board adopts the mounting mode that the requirement is lower, the cost is lower to PCB face area, integrates the circuit into an independent platelet unit, and is lower to PCB board device overall arrangement, the requirement of walking the line, has shortened development cycle, has reduced technical staff's the work degree of difficulty, need not simultaneously when with the product adaptation with mainboard and shell matching, the sexual valence relative altitude, the compatibility is strong, is fit for batch production, has higher using value.

The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.

Claims (6)

1. A topology identification core board for a platform area branch monitoring device is characterized by comprising an MCU unit, an AD sampling receiving unit, an interface unit and a reset unit, wherein the MCU unit is communicated with an intelligent circuit breaker or a platform area identification terminal main MCU through a UART (universal asynchronous receiver/transmitter) and is communicated with an AD sampling chip through an SPI (serial peripheral interface); the communication interface mainly has the functions of power supply, reset control, a UART interface and a current analog quantity acquisition interface; the reset unit performs a reset operation when a communication abnormality occurs.

2. The topology identification core board for a platform branch monitoring device according to claim 1, wherein the power supply of the whole core board is a dc 3.3V power supply provided by a circuit breaker or a platform identification terminal.

3. The topology recognition core board for a platform zone branch monitoring device according to claim 1, wherein the topology recognition core board and the main MCU adopt serial communication, and the topology recognition core board is specified to receive the host data as downlink communication, and the topology recognition core board replies to the host data as uplink communication.

4. The topology identification core board for a district branch monitoring device according to claim 1, characterized in that using ATSAMG55 as MCU, the main capabilities: a 32-bit ARM Cortex-M4 kernel with an built-in FPU and a maximum working dominant frequency of 120 MHz; 176KB SRAM, 512KB FLASH; the maximum number of the IO is 48, 8 12-bit ADC input pins are provided, the conversion rate is 500ksps, and the maximum number of the UART/SPI/IIC is supported; 1 USB 2.0.

5. The topology identification core board for the platform region branch monitoring devices of claim 1, wherein the AD sampling chip MCP3914, having eight synchronously sampled 24-bit resolution delta-sigma analog-to-digital converters, communicates with the main MCU through a UART port.

6. The topology recognition core board for platform branch monitoring devices of claim 1, wherein the external interface uses a stamp hole scheme, and has 24 pins distributed on both sides of the topology recognition core board.

Images