Intelligent substation auxiliary system comprehensive monitoring platform

Intelligent substation auxiliary system comprehensive monitoring platformOverview

The construction of smart grid is an important strategic deployment in the field of energy in China, which will gradually promote the change of China's basic power production mode. It is positioned to use advanced communication, information and control technologies to build an independent innovation and Chinese characteristic smart grid characterized by informatization, automation and interactivity. It is the development direction of the power industry. The implementation of smart grid first relies on online monitoring and real-time information control of important operating parameters in various links of the grid. Internet of Things technology has become an important technical means to promote the development of smart grid.

Construct an electric power Internet of Things system, deploy devices with certain sensing, computing, execution, and communication functions, establish an interconnected system through the electric power information communication network, with ubiquitous device sensing, miniaturized sensing units, centralized Internet of Things network, wireless data transmission, and intelligent application analysis. A network system that realizes the recognition, perception, interconnection, and control of power grid equipment and facilities, personnel, and the surrounding environment. The collaboration and interaction between entities in the network enable related objects to perceive and feedback control each other, forming a more intelligent power production system and better meeting the monitoring of power equipment.

The intelligent environment comprehensive monitoring system for distribution transformers will establish a data monitoring, dynamic display, and fault warning system based on Internet of Things technology, according to the standard architecture of perception layer, network layer, and application layer, to detect various environments and equipment such as switch stations, distribution stations, and ring cages. It will provide monitoring services for distribution network equipment, greatly reduce the maintenance workload of operation and inspection personnel, strengthen the security, protection, and fire alarm monitoring of distribution networks, and improve the safe operation of distribution networks.

Design Basis

The following documents are essential for the application of this document. For all referenced documents with dates, only the version with dates is applicable to this document. For any reference document without a date, its latest version (including all modified versions) applies to this document.

GB/T 2423.1 Environmental Testing for Electrical and Electronic Products Part 2: Test Methods Test A: Low Temperature GB/T 2423.2 Environmental Testing for Electrical and Electronic Products Part 2: Test Methods Test B: High Temperature

GB/T 2423.3 Environmental Testing for Electrical and Electronic Products Part 2: Test Methods Test C: Constant Temperature Damp Heat Method GB/T13729 Remote Terminal Equipment

DL/T 634.5 101 Remote Control Equipment and Systems Part 5-101: Transmission Protocol Basic Remote Control Task Supporting Standards

DL/T 634.5 104 Remote control equipment and systems - Part 5-104: Transmission protocol using IEC standard transmission protocol set

60870-5-101 Network Access

DL/T 721 Remote Terminal of Distribution Network Automation System

IEC61850-6 (DL/T860.6) Power Automation Communication Networks and Systems Part 6: Substation Communication Configuration Description Language Related to Intelligent Electronic Devices

IEC61850-7 (DL/T860.7) Power Automation Communication Networks and Systems Part 7: Basic Information Communication Structure IEC61850-8 (DL/T860.8) Power Automation Communication Networks and Systems Part 8: Specific Communication Service Mapping IEC61850-10 (DL/T860.10) Substation Communication Networks and Systems Part 10: Consistency Testing

Q/GDW 1517 Grid Video Surveillance System and Interface SIP-B

YD/T 2576.2 TD-LTE Digital Cellular Mobile Communication Network Terminal Equipment Testing Method (Phase I) Part 2 Wireless RF Performance Testing

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ISO/IEC PRF 20922 MQTT (Message Queuing Telemetry Transmission Protocol) MODBUS JSLKU Communication Protocol

Q/GDW Transmission and Transformation Equipment IoT Node Equipment Wireless Networking Protocol Q/GDW Transmission and Transformation Equipment IoT Micropower Wireless Network Communication Protocol Q/GDW Transmission and Transformation Equipment IoT Sensor Data Specification

Intelligent substation auxiliary system comprehensive monitoring platformMain architecture of the system

system topology

System Instructions

The intelligent environment comprehensive monitoring system for distribution transformers is mainly divided into three parts: perception layer, network layer, and application layer.

1) The perception layer includes various perception sensors (environment perception, device perception, image perception), and aggregation units (distribution and transformation intelligent environment comprehensive monitoring device). The perception layer is installed in various switch stations, distribution rooms, and ring network boxes to monitor the actual environmental status and various parameters on site in real time, such as open flames, smoke, illegal personnel intrusion, animal intrusion, cable trench water ingress, environmental temperature and humidity, access control management, air conditioning control, SF6 concentration, O2 content, dehumidifier control, cable contact temperature inside the switch cabinet, and partial discharge monitoring inside the switch cabinet.

2) The network layer is mainly composed of access gateways, and the data perceived by the power Internet of Things can be uploaded through APN/4G private network/fiber optic network, or through the power automation network with the help of DTU/FTU/TTU communication interfaces.

The network layer is responsible for implementing data transmission between terminal devices and IoT platforms, including data collection, response signals, network heartbeats, and other information sent upstream by terminals, as well as control commands, broadcast information, and response information issued by IoT platforms.

3) The application layer is mainly composed of various system master stations and various data and application services. It is mainly used to receive monitoring data collected and uploaded by sensors from the access gateway, perform extraction, analysis, display and other processing work, and jointly form a complete integrated information platform system for intelligent power Internet of Things application system.

Technical Solution

General environmental conditions

The equipment must meet the following requirements:

·Operating environment temperature and humidity

a) The climatic and environmental conditions for the normal operation of the equipment are shown in Table 1

Table 1 Classification of Operating Environment Temperature and Humidity in Workplaces

·Altitude

a) Can work normally within an altitude range of 0-4000 meters;

b) For devices installed at altitudes exceeding 1000 meters, the voltage withstand test requirements specified in Article 2.3.2 of GB/T 11022-2011 should be followed.

Station building intelligent assistance and artificial intelligence visualization gateway (ARM type)

Introduction to Hardware Features

a) The core CPU adopts domestic industrial grade chips, using ARM architecture RK3399K, with a minimum of 4 cores and a main frequency of 1.5GHz;

b) Configure a video processing module for video stream processing and artificial intelligence analysis, with a computing power of no less than 3Tops, using domestically produced chips and independently configured;

c) The gateway has 2GB of memory and 64GB of storage capacity.

d) The gateway has 2 wireless public network/wireless private network remote communication interfaces (public network 4G/3G/2G five mode adaptive, private network 4G), and should support 5G;

e) The gateway has 4 Ethernet interfaces;

f) The gateway has 4 RS-485 and 2 RS-232/RS-485 switchable serial ports, with serial port speeds available at 9600 bps, 19200 bps, and 115200 bps;

g) The gateway has LoRa wireless communication hardware interface, with 470MHz using the wireless networking protocol for power transmission and transformation equipment IoT node devices, and 2.4GHz using the communication protocol for power transmission and transformation equipment IoT low-power wireless network.

h) The gateway has power, operation, fault, and communication indicator lights;

i) The gateway has a local display screen, which enables the operation viewing and parameter configuration of sensing and control devices.

j) The gateway supports security intelligent TF authentication, encryption chip data encryption, MQTT soft encryption, and meets the unified security requirements of the Internet Department.

k) Remote communication: Supports protocols such as DL/T 634.5 104, MQTT, Q/GDW 1517.1-2014 Power Grid Video Surveillance System and Interface (SIP-B), etc. The network layer IP protocol should support IPv4 and IPv6 protocols.

l) Local communication: Supports protocols such as DL/T 634.5 104, IEC61850 (DL/T 860), MQTT, Q/GDW 1517.1-2014 Power Grid Video Surveillance System and Interface (SIP-B), GB28181, Wireless Networking Protocol for IoT Node Equipment of Power Transmission and Transformation Equipment, and Micro Power Wireless Network Communication Protocol for Power Transmission and Transformation Equipment IoT.