GB/T 25095-2020Monitoring system of operating status for overhead transmission lines (English PDF)

3.1 Operating status of transmission lines

The condition of the equipment during the operation of the transmission line, the condition of the channel environment, and the influence of the surrounding environment.

3.2 Monitoring system of operating status for transmission lines

A general term for a software and hardware system used to perform on-site measurement, information transmission, storage, processing and analysis of various types of information such as the status of the transmission line itself and the channel environment.

NOTE: It consists of a master station system of status monitoring, a status monitoring device and a communication network of status monitoring.

3.3 Master station system of status monitoring

A computer system that can access various monitoring information such as the status of the transmission line itself and the channel environment, and perform centralized storage, unified processing, analysis, display and application of data.

3.4 Status monitoring device

A measuring device that collects real-time field status information such as the status of the transmission line itself and the channel environment, and transmits the field information to the main station system through the communication network.

NOTE: It consists of a data acquisition unit, a data monitoring terminal and a power unit.

3.4.1 Data acquisition unit

A measuring device that collects real-time field status information such as the status of the transmission line itself and the channel environment, and transmits the field information to the main station system through the communication network.

NOTE: It consists of a data acquisition unit, a data monitoring terminal and a power unit.

3.4.2 Data monitoring terminal

A device that collects information from various data acquisition units, stores and processes it on-site, and can also exchange information with the main station system.

3.4.3 Power unit

A device that provides power to the transmission line status monitoring device and has management functions such as power status monitoring, load classification management, and safety protection.

4.2 System classification

4.2.1 According to the monitoring object, the monitoring system of operating status for transmission lines is divided into two types. line body status monitoring system and channel environment status monitoring system.

4.2.2 The line status monitoring system is used to monitor the operating status of the foundation, tower, ground wire, insulator, hardware, grounding device and auxiliary facilities of the transmission line. According to the functional use, it is divided into. ground wire icing monitoring, ground wire breeze vibration monitoring, conductor dancing monitoring, conductor temperature monitoring, conductor sag monitoring, wind deviation monitoring, on-site pollution monitoring, fault location monitoring, tower tilt monitoring, etc.

4.2.3 The channel environment status monitoring system is used to monitor the meteorological environment and channel conditions of the power transmission channel.

According to the functional use, it is divided into. meteorological monitoring, image/video monitoring, wildfire monitoring, external force damage monitoring, geological disaster monitoring, etc.

5.1 Master station system

5.1.1 Functional requirements

5.1.1.1 Data reception

The data receiving function of the master station system shall include.

a) It shall be able to reliably receive and store the line body and channel environment status monitoring data (including images/videos) sent by the monitoring device;

b) It shall be able to reliably receive and store the operating status information of the monitoring device sent by the monitoring device (including the operating status of each component unit such as the data acquisition unit, data monitoring terminal, power unit and host). If wireless communication is used, it shall also be able to collect the communication signal strength of the location of the monitoring device;

c) It shall be able to adjust the operating parameters of the master station system (such as the data collection cycle, sleep cycle, status warning value, etc. of the monitoring device) according to the changing characteristics of the collected parameters;

d) When problems such as main station system failure, monitoring device offline failure, communication network failure, etc. occur, after the failure is eliminated, the data during the interruption period shall be able to be re-recorded by calling for retransmission and other methods.

5.1.1.2 Status analysis

The status analysis function of the master station system shall include.

a) Be able to update and maintain the basic parameter information of the line where the monitoring device is installed, as well as match the calculation model parameters such as line icing, sag, wind deviation, and galloping;

b) Based on the on-site monitoring data and line parameter information, it has the function of analyzing the line operation status, and visually displays the line operation status through wiring diagrams, maps, charts, etc. It has the function of analyzing the historical changes of line status, and displays the changes of line status through trend curves, charts, etc.;

c) It has the function of visually displaying various monitoring data and data processing results. It can display monitoring data through charts, data details and other methods.

5.1.1.3 Alarm analysis

The alarm analysis function of the master station system shall include.

a) It has the functions of collecting, processing and publishing alarm information of the operating status of transmission lines. It can warn of abnormal status and hidden danger risks of the line body and channel environment;

b) It has the function of reporting alarm information and its processing status;

c) It has the function of querying alarm parameter settings.

5.1.1.4 Fault diagnosis

The fault diagnosis function of the master station system shall include. […]

5.1.2.2 Reliability

The main station system can operate normally for no less than 72 h continuously, provided that the server, operating system, database and other hardware and software configurations meet the requirements.

5.1.2.3 Security

The security of the master station system shall include.

a) The master station system shall comply with the requirements of information system security GB/T 22239 and GB/T 22240;

b) The master station system shall not affect the security of the power system during operation. It shall not cause power grid safety accidents due to system failures or errors;

c) The authorized users operate the data within their authority, and the system data design is safe and reliable.

5.2 Monitoring device

5.2.1 The appearance and structure, protection level, accuracy, function test, power supply performance, environmental adaptability, electromagnetic compatibility, electrical performance, mechanical performance and reliability of the monitoring device shall comply with the requirements of GB/T 35697.

5.2.2 For the selection of the installation site for the monitoring device, please refer to Annex A. For installation and maintenance instructions, please refer to Annex B.

5.3 Communication network

5.3.1 Network structure

The network structure of the condition monitoring system shall adopt multi-layer distributed structure. It can support Browser/Server structure (referred to as "B/S") and Client/Server structure (referred to as "C/S"). It can run normally in operating systems with higher security such as LINUX.

5.3.2 Communication method

5.3.2.1 The condition monitoring system may adopt wired and wireless communication methods.

5.3.2.2 The main wireless communication methods that can be used are. Access Point Name (APN)-based dedicated network, power wireless dedicated network, satellite communication, etc.

5.3.2.3 The main wired communication methods that can be used are. power fiber optic private network, operator fiber optic private network, etc.

5.3.3 Secure access

When the monitoring device is connected to the main station system by wireless or wired communication, information security measures shall be taken. Data interaction and normal data communication with the main station system can be carried out. The security access meets the requirements of GB/T 22239 and GB/T 22240.

5.3.4 Communication protocol

The application layer data transmission protocol between the master station system and the monitoring device shall meet the requirements of GB/T 35697.

6.1 Master station system test method

6.1.1 Functional test

6.1.1.1 Data reception test

Turn on the master station system. Connect the monitoring device and run it normally. Perform the test as follows.

a) Check whether the received device monitoring data and device operation status information are normal through the master station system;

b) Manually modify the system operating parameters in the master station system, such as the data collection cycle and sleep cycle of the monitoring device, and check whether the collected data interval and sleep cycle are the new setting values;

c) After shutting down the main station system for a period of time, resume the system and check whether the data missed during the interruption period has been recorded.

6.1.1.2 Status analysis test

Turn on the master station system. Connect the monitoring device and run it normally. Perform the test as follows.

a) Manually modify the basic parameter information of the monitoring device […]

6.1.2 Performance test

6.1.2.1 Storage performance test

This test is carried out simultaneously with the test in 6.1.1.1. After the monitoring device is connected to the main station system and operates normally, check whether it can receive data and complete data storage through the main station system.

Confirm the number of monitoring devices to be connected to the master station system.

Estimate the maximum monitoring data capacity of each monitoring device received by the master station system each year. Based on this, determine the storage capacity required for the master station system to operate for 5 years. Check that the actual storage capacity of the main and auxiliary storage of the master station system shall be more than twice the storage capacity required in the past 5 years.

6.1.2.2 Reliability test

Turn on the master station system and run it continuously for 72 h. Check whether all functions of the master station system are normal.

6.1.2.3 Safety test

Check whether the main station system has a security level protection assessment and security protection evaluation report issued by a third-party assessment agency with information system level protection assessment qualifications.

6.2 Test method for monitoring device

The test shall be carried out in accordance with GB/T 35697.

6.3 Test methods for communication networks

6.3.1 Network structure test

Choose to test the main site system and database under B/S or C/S structure to verify the network structure.

6.3.2 Data communication test

Turn on the master station system. After the monitoring device is connected and running normally, carry out data communication test between the master station system and the monitoring device in wireless communication mode or wired communication mode.

Check whether the data communication network is unobstructed and the data communication method used.

6.3.3 Security access test

Turn on the master station system. Connect the monitoring device to the master station system by wireless communication or wired communication. After the monitoring device is turned on and operates normally, check the information security measures taken. Check whether the monitoring device and the master station system can exchange data normally, whether the data communication is normal, and whether the information security meets the requirements.

6.3.4 Communication protocol test

The test shall be carried out in accordance with GB/T 35697.

7.1 Type test

Type test is to test the whole set of transmission line condition monitoring system products item by item, including the main station system, monitoring device and communication network. Type test shall be carried out in any of the following situations.

a) Before a new product is finalized;

b) During normal production, once every 4 years;

c) Before the product is transferred to another factory for finalization and appraisal;

d) After the formal production, when there are major changes in structure, materials, processes, etc. that may affect product performance;

e) When production is resumed after being suspended for one year or more;

f) When the national technical supervision agency or the technical inspection department entrusted by it puts forward a type inspection requirement;

g) When there is a significant difference between the factory inspection results and the inspection results of the previous batch of products;

h) When stipulated in the contract.

The type test is to be carried out according to the test items specified in Table 1.

7.2 Exit-factory Test

The exit-factory test items are shown in Table 1. The manufacturer can add test items according to user requirements and after negotiation between the two parties.

7.3 Sampling test

The sampling test is carried out according to the following sampling plan and judgment […]

8.1.2 Packaging marks

A prominent and firm packaging mark shall be placed at an appropriate location on the packaging box. The contents include.

a) Name and address of manufacturer;

b) Name and model of product;

c) Number of equipment;

d) Dimensions of packaging box (mm);

e) Net weight or gross weight (kg);

f) Transportation operation safety sign;

g) Destination station (port) and consignee;

h) Departure station (port) and consignee.

8.1.3 Storage and transportation diagrams and delivery and receipt marks

Packaging, storage and transportation diagrams and shipping and receiving marks shall be selected based on the characteristics of the packaged products and in accordance with the relevant provisions of GB/T 191 and GB/T 6388.

8.2 Packaging

The power transmission line status monitoring system products shall be well packaged, reasonably structured, compact, and reliably protected during transportation. The packaging environment and packaging box shall be clean, dry, free of harmful gases and foreign matter.

8.3 Technical documents provided with the product

The documents provided with the product shall contain the following contents and comply with the requirements of GB/T 9969.

a) Packing list;

b) Installation and operation manual (one copy for each set of products); […]

A.1 Typical monitoring devices of line condition monitoring system

A.1.1 Ground wire ice monitoring device

The ground wire ice monitoring device shall be installed in the following locations.

a) Windward slopes, passes, wind tunnels, large water surfaces and other areas prone to ice;

b) The angle between the transmission line and the dominant wind direction in winter is greater than 45°;

c) Areas with heavy snow all year round;

d) Areas with heavy wind outlets for high-voltage transmission lines;

e) Ice zone demarcation points, sections with historical ice damage, and sections that are difficult for personnel to reach in medium and heavy ice areas.

A.1.2 Breeze vibration monitoring device for ground conductor

The breeze vibration monitoring device shall be installed in the following locations.

a) Important crossing sections (large crossing sections such as rivers, lakes, and straits);

b) Important transmission lines prone to vibration;

c) Sections where large vibrations can be observed or where strands have been broken due to vibration.

A.1.3 Conductor dancing monitoring device

The galloping monitoring device shall be installed in the following locations.

a) Important crossing sections in galloping-prone areas (such as the Yangtze River and the Yellow River);

b) Transmission lines in micro-topography and micro-meteorological areas where galloping is likely to occur; […]