NB/T 35042-2024Code for communication design of hydropower plants (English PDF)

Foreword

This document was issued on 24 May 2024 by the National Energy Administration of the PRC and takes effect on 24 November 2024.

It is a NB/T standard: recommended rather than compulsory, but it is the text a Chinese reviewer applies when assessing a submission.

It is classified under ICS 27.140, Chinese classification P 59.

It replaces NB/T 35042-2014, which is superseded.

In accordance with the requirements of the 'Notice of the General Department of the National Energy Administration on Issuing the 2021 Energy Sector Industry Standard Formulation and Revision Plan and Foreign-Language Version Translation Plan' (Guo Neng Zong Tong Ke Ji [2021] No. 92), the drafting group revised this code through extensive investigation and research, careful summarization of practical experience, reference to relevant advanced domestic and foreign standards, and on the basis of wide solicitation of opinions.

The main technical contents of this code are: general provisions; composition of the communication system and selection of communication modes; in-plant communication and emergency communication of hydropower plants; communication for access to the power system; communication between the hydropower plant and the centralized control center; construction communication; communication for the automatic hydrologic forecast system; power line carrier communication; optical fiber communication; digital microwave communication; very small aperture terminal (VSAT) system for domestic satellite communication; communication power supply; communication lines; lightning protection and earthing of communication equipment; seismic design for installation of communication equipment; and requirements for communication equipment layout and for buildings of special communication rooms.

The main technical contents revised in this code are as follows:

— The scope of application has been revised to 'This code is applicable to the communication design of newly built, reconstructed and extended hydropower plants'.

— Requirements for soft switching have been added.

— Transmission quality indexes for power line carrier communication when transmitting relay protection and security and stability control device signals have been added.

— Provisions on the SDH-based multi-service transport node (MSTP) have been added.

— Provisions on spread-spectrum digital microwave communication and packet digital microwave communication have been added.

— Provisions on the route selection and laying of communication optical cable lines have been added.

— The requirements for communication between the hydropower plant and the centralized control center have been revised.

— The requirements for the selection of communication modes of the automatic hydrologic forecast system have been revised.

— The requirements for communication rooms of hydropower plants have been revised.

— The chapter 'Satellite Communication Earth Station' of the previous code has been deleted.

— The section 'Frequency Separation Filter' of the previous code has been deleted.

— The two sections 'Special Optical Cables for Power Systems' and 'Optical Repeater Station' of the previous code have been deleted.

— The section 'Digital Interface for Microwave Transmission of Relay Protection Information' of the previous code has been deleted.

— The section 'Centralized Monitoring System for Communication Power Supply' of the previous code has been deleted.

— The section 'Integrated Cabling System' of the previous code has been deleted.

— The two sections 'Lightning Protection and Earthing of Optical Repeater Stations' and 'Lightning Protection and Earthing of Satellite Earth Stations' of the previous code have been deleted.

This code is under the administration of the National Energy Administration, is proposed and routinely managed by China Renewable Energy Engineering Institute, and the energy industry standardization technical committee for hydropower electrical design (NEA/TC17) is responsible for the explanation of specific technical contents. Any comments or suggestions arising during implementation should be sent to China Renewable Energy Engineering Institute (address: No. 57 Jia and No. 57 Yi, Andingmenwai Street, Dongcheng District, Beijing; postcode: 100011).

Chief development organization: PowerChina Northwest Engineering Corporation Limited.

Participating development organization: PowerChina Huadong Engineering Corporation Limited.

Chief drafting staff: Wang Jun, Yang Zhenhuan, Tong Tianqi, Wang Debing, Cao Yizhou, Xu Han, Zhang Guoqiang, Lai Yanfei, Zhao Tianyue, Wang Jia, Feng Rui, Wang Zhaoxi, Xue Jinxuan, Yang Zhangwu, Yuan Yichen, Wang Han.

Chief reviewing staff: Liu Guoyang, Wang Jinfu, Feng Hanfu, Li Li, Zeng Gengyun, Zeng Guangyi, Wu Zhengyi, Dong Qiang, Zeng Hongbing, Zheng Lin, Qiu Yajing, Chen Jun, Huang Huimin, Dong Jie, Wang Luyong, Li Shisheng.

Publication information

NB/T 35042-2024 is an energy industry standard of the People's Republic of China, Code for Communication Design of Hydropower Plants, replacing NB/T 35042-2014. ICS 27.140; CCS P 59.

Issued by the National Energy Administration on 2024-05-24; implemented on 2024-11-24.

Chief editing department: China Renewable Energy Engineering Institute. Approval department: National Energy Administration. Implementation date: 24 November 2024. Published by China Water and Power Press, Beijing, 2024.

National Energy Administration Announcement No. 2 of 2024: in accordance with the Standardization Law of the People's Republic of China and the Measures for the Administration of Energy Standardization, the National Energy Administration approved 335 energy industry standards (Attachment 1), 20 foreign-language versions of energy industry standards including 'Specification for Reservoir Area Engineering Geological Investigation of Hydropower Projects' (Attachment 2) and 4 amendment notices of energy industry standards (Attachment 3), which are hereby issued. National Energy Administration, 24 May 2024.

Attachments to the announcement: 1. List of industry standards; 2. List of foreign-language versions of industry standards; 3. Amendment notices of industry standards.

Attachment 1, List of industry standards, entry No. 197: standard number NB/T 35042-2024; title Code for Communication Design of Hydropower Plants; replaced standard NB/T 35042-2014; no adopted standard indicated; approval date 2024-05-24; implementation date 2024-11-24.

Structure of the code

Chapter 1, General Provisions (page 1).

Chapter 2, Composition of Communication System and Selection of Communication Modes (pages 2-3): 2.1 Composition of Communication System; 2.2 Selection of Communication Modes.

Chapter 3, In-Plant Communication and Emergency Communication of Hydropower Plant (pages 4-7): 3.1 General Requirements; 3.2 In-Plant Dispatching Communication; 3.3 In-Plant Administrative Communication; 3.4 Emergency Communication of Hydroelectric Power Plants.

Chapter 4, Access to Electric Power System Communication (page 8).

Chapter 5, Communication between Hydropower Plant and the Centralized Control Center (page 9).

Chapter 6, Construction Communication (page 10).

Chapter 7, Communication for Automatic Hydrologic Forecast System (pages 11-13): 7.1 General Requirements; 7.2 Selection of Communication Modes; 7.3 Central Station Information Exchange Network.

Chapter 8, Power Line Carrier Communication (pages 14-19): 8.1 General Requirements; 8.2 Transmission Quality Indexes; 8.3 Carrier Channel Organization; 8.4 Selection of Carrier; 8.5 Selection of Line Trap; 8.6 Selection of Coupling Filter and Earthing Switch; 8.7 Selection of Coupling Capacitor; 8.8 High-Frequency Cable; 8.9 Equipment Installation.

Chapter 9, Optical Fiber Communication (pages 20-26): 9.1 General Requirements; 9.2 Transmission System Model and Functional Requirement; 9.3 Network Organization; 9.4 Design of Interface and Repeater Section; 9.5 Auxiliary System; 9.6 Fiber Type and Working Wavelength.

Chapter 10, Digital Microwave Communication (pages 27-37): 10.1 General Requirements; 10.2 Basic Technical Requirements; 10.3 Basic Requirements for Routing of Digital Microwave Relay Communication System; 10.4 Design Requirements for Microwave Station.

Chapter 11, Very Small Aperture Terminal (VSAT) System for Domestic Satellite Communication (pages 38-47): 11.1 General Requirements; 11.2 Design of VSAT Network; 11.3 Design of VSAT Communication System; 11.4 Site Selection of VSAT Communication System; 11.5 Configuration of VSAT Communication System Equipment; 11.6 Installation and Power Supply System of VSAT Communication System Equipment.

Chapter 12, Communication Power Supply (pages 48-53): 12.1 General Requirements; 12.2 High-Frequency Switch-Mode Power Supply for Communication; 12.3 Battery for Communication; 12.4 AC Uninterruptible Power System for Communication; 12.5 Combined Solar Power System for Communication.

Chapter 13, Communication Lines (pages 54-57): 13.1 General Requirements; 13.2 Laying of Communication Lines.

Chapter 14, Lightning Protection and Earthing of Communication Equipment (pages 58-59): 14.1 Lightning Protection and Earthing of In-Plant Communication System; 14.2 Lightning Protection and Earthing of Independent Communication Station Outside the Hydropower Plant.

Chapter 15, Seismic Design for Installation of Communication Equipment (pages 60-64): 15.1 General Requirements; 15.2 Seismic Design for Installation of Communication Equipment.

Chapter 16, Requirements for Communication Equipment Layout and Special Communication Rooms (pages 65-69): 16.1 Composition and Layout of Communication Rooms; 16.2 Layout of Communication Equipment; 16.3 Construction Requirements for Special Communication Rooms.

Back matter: Explanation of Wording in This Code (page 70); List of Quoted Standards (page 71); Additions: Explanation of Provisions (page 75).

1 Scope

NB/T 35042-2024 is the Chinese code for the communication design of hydropower plants, replacing the 2014 edition. A hydropower station depends on communication for its operation and its safety: the dispatch centre must be able to command the units, the operators must reach every part of a plant that may lie deep underground, the dam must be connected to flood warning downstream, and in an emergency these links must still work. The code sets the general provisions, then the composition of the communication system and the selection of communication modes - power line carrier, optical fibre, microwave radio and satellite VSAT - with the criteria for choosing among them. It covers in-plant communication and emergency communication, including the exchange, the dispatching and administrative telephone systems, radio coverage in caverns and tunnels, and the paging and broadcast systems. System communication follows, linking the plant to the grid and the control centre, together with construction-period communication on site and the hydrological telemetry network. The carrier equipment selection, the optical and radio links and their routes, the communication power supply with its batteries and backup, the cable lines, lightning protection and earthing, seismic protection of equipment, and the layout of the communication rooms complete the code. It applies to the design of communication systems for hydropower plants in China.

1.0.1 This code is formulated with a view to standardizing the communication design of hydropower plants.

1.0.2 This code is applicable to the communication design of newly built, reconstructed and extended hydropower plants.

1.0.3 The communication design of hydropower plants shall follow the basic principles of safety and reliability, advanced technology, economic rationality, convenience of use and assured quality.

1.0.4 The communication modes selected in the design shall comply with the requirements of the current national laws and regulations, and the equipment selected shall comply with national, industry and international standards and shall have obtained the network access licence issued by the relevant authorities.

1.0.5 The communication design of a hydropower plant shall rationally formulate the scheme and determine the communication modes, equipment selection and layout of the communication system according to specific conditions such as the operation mode of the hydropower plant, the layout conditions of the project complex, the requirements of the power system in which it is located and the characteristics of the natural environment. The communication design shall meet the needs of transmitting all kinds of information among the operation and management of the hydropower plant, power system dispatching, the centralized control center, related departments and the cascade hydropower plants of the river basin; it shall take both long-term and near-term needs into account and be compatible with the communication development plan of the power system concerned.

1.0.6 In addition to this code, the communication design of hydropower plants shall also comply with the current relevant national standards.

2 Composition of Communication System and Selection of Communication Modes

2.1 Composition of Communication System

2.1.1 The communication system of a hydropower plant may include in-plant communication and emergency communication of the hydropower plant, communication for access to the power system, communication with the centralized control center, communication for the automatic hydrologic forecast system, and construction communication.

2.1.2 Communication services may include the following:

(1) Voice services may include production dispatching telephones, production administrative telephones, etc.

(2) Data services may include the in-plant monitoring and control system, the management information system, etc.

(3) Video services may include the industrial television system, etc.

2.1.3 In-plant communication and emergency communication of a hydropower plant shall include the following parts:

(1) In-plant production dispatching communication.

(2) In-plant production administrative communication.

(3) In-plant communication lines.

(4) Emergency communication.

2.1.4 Communication for access to the power system shall include the following parts:

(1) Dispatching and administrative communication between the hydropower plant and the dispatching department of the power system.

(2) Communication for other service needs between the hydropower plant and the power system, which may include system relay protection, system dispatching automation, system security and stability control communication, etc.

2.1.5 Communication between the hydropower plant and the centralized control center shall include the following parts:

(1) Dispatching and administrative communication between the hydropower plant and the centralized control center.

(2) Communication for other service needs between the hydropower plant and the centralized control center, which may include centralized control, industrial television communication, etc.

2.1.6 Communication for the automatic hydrologic forecast system should include the following parts:

(1) Communication between telemetry stations and the sub-central station or central station.

(2) Communication between sub-central stations and the central station.

(3) Communication between the central station of this system and the central stations of other systems.

2.1.7 Construction communication may include the following parts:

(1) Communication within the construction site.

(2) Communication between the construction site and the outside.

2.2 Selection of Communication Modes

2.2.1 The selection of communication modes shall follow the national communication technology policies and shall be determined after technical and economic comparison according to the characteristics of the hydropower plant, in combination with the current communication status and development plans of the river basin and of the power system where the hydropower plant is located. The selected communication modes shall ensure the rapid, accurate, safe and reliable transmission of all kinds of information within the hydropower plant and for power system dispatching, cascade dispatching of the river basin or dispatching by the centralized control center.

2.2.2 Wired and wireless communication modes may be selected. Wired communication modes may be optical fiber communication, power line carrier communication, etc.; wireless communication modes may be microwave communication, satellite communication, mobile communication, and short-wave and ultra-short-wave communication.

2.2.3 When wireless communication modes are selected, the frequencies and operating frequency bands used shall comply with the relevant national provisions on radio frequency allocation and shall be submitted to the relevant radio administration authority for approval in accordance with the relevant provisions.

2.2.4 Communication for access to the power system shall be determined according to the requirements of the power grid for the access of this power station to power system communication, and should be based mainly on optical fiber communication.

2.2.5 The communication modes for centralized control communication of cascade hydropower stations shall comply with the relevant provisions of the current industry standard NB/T 10232 on centralized control communication design of cascade hydropower stations.

2.2.6 The communication modes for construction communication shall be rationally selected according to the general construction layout of the site. The selected modes shall meet the requirements of communication within the construction site, communication between the site and the outside, and flood-control communication during construction; the combination of construction communication with permanent communication should be considered.

3 In-Plant Communication and Emergency Communication of Hydropower Plant

3.1 General Requirements

3.1.1 In-plant communication of a hydropower plant shall provide reliable voice, data and video service channels for the hydropower plant.

3.1.2 In-plant communication of a hydropower plant shall ensure a high degree of reliability and availability of dispatching telephones. The production dispatching communication switching network may enter the production administrative communication switching network, but the production administrative communication switching network shall not enter the production dispatching communication switching network.

3.1.3 A plant-wide integrated communication monitoring and control system may be provided for the in-plant communication of a hydropower plant.

3.2 In-Plant Dispatching Communication

3.2.1 Large hydropower plants shall be equipped with a digital dispatching switch dedicated to in-plant dispatching telephone service and power system dispatching telephone service, with the in-plant production administrative private branch exchange or the public network as backup. Medium-sized hydropower plants shall be equipped with a digital dispatching switch for in-plant dispatching telephone service and power system dispatching telephone service, and the dispatching switch may also serve as the private branch exchange for in-plant production administrative communication.

3.2.2 The digital dispatching switch shall have the following main functions:

(1) It shall be able to connect effectively and work reliably with the various transmission equipment in the existing communication network.

(2) It shall have functions such as forced release, forced intrusion, hotline service, call pickup, group call and broadcast call, abbreviated dialing, call back, conference, transfer, hold and recording. It shall have hierarchical priority, consecutive trunk hunting, direct trunk selection, route reselection and alternative routing functions. Under abnormal conditions, it shall be able to automatically block and restore trunks or extension users.

(3) It shall be provided with a fully functional and easy-to-operate intelligent dispatching console. The console may be of the screen type or the key type and shall have 1 to 2 operator positions.

3.2.3 When the digital dispatching switch is interconnected with the in-plant production administrative private branch exchange, a suitable trunking mode may be selected according to the specific conditions and needs, and the trunking mode shall comply with the national (the remainder of this clause continues on page 5 of the full standard).