What are the main technical advantages of smart substations compared to conventional substations?

When there is a problem with the equipment, an early warning will be issued and the status parameters will be provided, which will reduce the operation and management cost to a certain extent, reduce the hidden dangers, and improve the reliability of the transformer operation. Intelligent high-voltage switchgear is a high-performance switchgear and control device equipped with electronics, sensors and actuators with monitoring and diagnostic functions. Electronic transformers refer to pure optical fiber transformers, magneto-optical glass transformers, etc., which can effectively overcome the shortcomings of traditional electromagnetic transformers.

There are two functions of the unified information platform of the substation, one is the horizontal information sharing of the system, which is mainly manifested in the unification of information acquisition by various upper-level applications in the management system; The second is the standardization of the longitudinal information of the system, which is mainly manifested in the transparency of the application support of each layer to its upper layer. Intelligence is humanization, that is, the substation is like a person adjusting, when the low-voltage load increases, the substation sends out the electricity to meet the increased load, and when the low-voltage load decreases, the substation sends less power to ensure energy saving. <>

The intelligent substation can complete the information collection and information processing with a wider range, deeper level and more complex structure than the conventional substation, and the interaction ability within the substation, between stations and dispatching, between stations, between stations and large users and distributed energy resources is stronger, the exchange and integration of information is more convenient and fast, and the control means are more flexible and reliable.

The intelligent substation equipment has the main technical characteristics such as information digitization, function integration, compact structure, and state visualization, and meets the requirements of industrial applications that are easy to expand, upgrade, transform, and maintain. The intelligent substation equipment has the main technical characteristics such as information digitization, function integration, compact structure, and state visualization, and meets the requirements of industrial applications that are easy to expand, upgrade, transform, and maintain. Advantages of smart substations.

The intelligent substation mainly includes two parts: intelligent high-voltage equipment and substation unified information platform. Intelligent high-voltage equipment mainly includes intelligent transformers, intelligent high-voltage switchgear, electronic transformers, etc. The intelligent transformer is connected to the control system by means of communication fibers, which can grasp the status parameters and operation data of the transformer in time.

Intelligent substationThe intelligent substation system is divided into 3 layers, as follows:

1. The process layer includes intelligent equipment, merging units and intelligent terminals composed of primary equipment and intelligent components, which completes the power distribution, conversion, transmission and measurement, control, protection and metering of substation

2. Spacer equipment generally refers to secondary equipment such as relay protection device, measurement and control device, fault recording, etc., to realize the function of using an interval of data and acting on the interval primary equipment, that is, communicating with various remote input and output, intelligent sensors and controllers.

3. The control layer includes automation system, station domain control system, communication system, timing system and other subsystems, which realize the measurement and control functions for the whole station equipment, and complete the data acquisition and monitoring control (SCA-DA), operation locking, synchrophasor acquisition, electrical energy collection, protection information management and other related functions.

It is generally divided into the following four specific situations:

1) The intelligent terminal has the function of switching and analog acquisition, and the input points can be flexibly configured according to the needs of the project; The switching input should be collected by strong current; The analogue input should be able to receive 4 20mA current and o 5V.

2) The intelligent terminal has the function of switching output, the number of output points can be flexibly configured according to the needs of the project, and the output contact capacity of the relay should meet the actual needs of the site.

3) The intelligent terminal has the function of circuit breaker control, and different modes such as split-phase control or three-phase control can be selected according to the needs of the project. In addition, Xiangtai Electric prompts at least two components of phase trip contacts and a combination of gate contacts, and the jump and close commands need to be reliably verified.

4) The intelligent terminal should have the ability to receive protection tripping commands, hand-closed circuit breaker commands for measurement and control, and goose commands such as isolation switches and grounding switches, input circuit breaker positions, isolation switches and grounding switch positions, circuit breaker body signals (including low pressure locking reclosing, etc.), with tripping and closing self-holding functions, and control loop disconnection monitoring, tripping pressure monitoring 30 vision and locking functions.

The so-called integrated automation of substation is to unify the functions of microcomputer monitoring, microcomputer protection and microcomputer telecontrol device of substation, give full play to the role of microcomputer, improve the automation level of substation, improve the reliability of substation automatic device, and reduce the integrated automation system of substation secondary system connection line. It can complete the functions of telecontrol, protection, operation (error prevention), measurement, fault recording, accident sequence recording and automatic recording of operating parameters, etc., and has high reliability, and can realize the unmanned operation of the substation. The advantages of integrated automation of substations are:

The hardware configuration of the secondary part of the substation is greatly simplified and duplication is avoided; It greatly simplifies the connection between the secondary equipment of the substation; It greatly reduces the workload of installation, construction and maintenance, and also reduces the total cost; It has laid the foundation for the improvement of the automation level of operation management.

Unattended substation refers to the substation without regular operation duty personnel, the operation status of the station (including the necessary various quantities, power flow direction, the position of the switching appliance, the position of the transformer voltage regulating tap, the number of compensation capacitor switching groups, etc.), after the microcomputer telecontrol terminal device RTU processing of the substation, and then transferred to the computer system of the power department at the upper level through the telecontrol channel, and displayed on the monitor CRT and the system screen, can also be printed and tabulated, For the dispatch duty personnel to monitor the query at any time, and then make corresponding processing. In the integrated automation system of power dispatching, the computer protection system can directly calculate and judge, and automatically process. On the contrary, the dispatcher can carry out remote control, remote adjustment, remote signaling, telemetry and other "four remote" operations on the controllable equipment in the unmanned substation through the telecontrol monitoring system, and the duties of the original substation operation duty personnel can be completed in the power dispatching integrated automation system, so there is no need for special operation duty personnel in the substation, so it is called an unmanned duty substation.

Unattended substation is inseparable from microcomputer protection, microcomputer protection unattended is a prerequisite, should be composed of three parts, the first part: front-end integrated monitoring equipment (audio monitoring, environmental variable monitoring, entrance and exit monitoring, etc.), integrated monitoring host, integrated monitoring software; Part 2: Network transmission part (broadband network, wireless network, ADSL or private network for industry users); Part III:

Management center software platform, unattended server, monitoring terminal, MIS network terminal, etc.

What do you think is the future development trend of UHV transmission intelligent substations and equipment?

Hello! We are glad to answer for you, what do you think is the future development trend of UHV transmission intelligent substation and equipment: The future development trend of substation automation in the intelligent substation industry is very considerable.

What is the current development status of the UHV equipment market? In view of the distribution of hydropower resources in China, the southwest region is usually rich in resources, and most of the electricity load centers are concentrated in the Yangtze River Delta, Pearl River Delta and Bohai Bay region along the eastern coast. Generally speaking, China's large energy bases are more than 1,000 kilometers away from the load centers in the eastern and central regions, and some even reach 3,000 kilometers, which is actually beyond the economic transmission distance of traditional ultra-high voltage transmission lines.

This problem exists to a greater or lesser extent in all countries around the world. The large power grid with UHV as the special lead can solve this problem. In the investment of UHV projects, equipment investment accounts for about 25 35%, towers and cable investment and UHV line length are related, accounting for about 30%, and infrastructure and other investments account for 35%.

In DC equipment, converter transformers, converter valves and GIS (gas-insulated metal-enclosed switch) have a large investment; In AC equipment, 1000kV GIS, transformers and reactors are invested in large quantities. Based on the estimation that UHV equipment accounts for 35% of the largest investment, the market size of UHV equipment in 2020 will be 32.2 billion yuan. According to preliminary statistics, the market size of UHV equipment in 2021 will be about 29.8 billion yuan.

According to the statistical analysis of the report "Analysis of the Development Status of UHV Equipment Market and the Supply and Demand Pattern of the 2022-2027 Year" report of the China Research Institute of Puhua Research Institute, it is shown that: 1. The development status of China's UHV construction In China, UHV refers to the voltage level of direct current of 800 kV and above and alternating current of 1000 kV and above. The research on ultra-high voltage transmission technology in foreign countries started early, but no breakthrough has been made in large-scale commercial application.

China has realized the large-scale commercial application of UHV transmission projects, and has basically achieved comprehensive localization in core technologies. 2. In 2020, the State Grid proposed in the "Huaihui Case of Carbon Peak and Carbon Neutrality Action" that during the "14th Five-Year Plan" period, the new cross-regional transmission channel of the State Grid will mainly transmit clean energy, and will be planned to be built into 7 UHV DC, with an additional transmission capacity of 56 million kilowatts. Thank you for your inquiry, and I hope my answer will be helpful to you.