NB/T 10072-2018Code for design of pumped storage power stations (English PDF)

Foreword

This document was issued on 29 October 2018 by the National Energy Administration of the PRC and takes effect on 1 March 2019.

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It replaces DL/T 5208-2005, which is superseded.

This code has been revised by the drafting group on the basis of extensive investigation and research, a careful summing-up of practical experience and a wide solicitation of opinions, in accordance with the requirements of the Notice of the National Energy Administration on Issuing the Plan for the Formulation and Revision of the First Batch of Energy Sector Industry Standards in 2012 (Guo Neng Ke Ji [2012] No. 83).

The main technical contents of this code are: hydrology; design of hydropower planning; engineering geological investigation; project general layout and hydraulic structure design; design of hydromechanical systems; design of electrical systems; control, protection and communication; design of hydraulic steel structure; construction planning; and economic evaluation.

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

Added requirements for the work contents and the depth of work of each design stage.

Added requirements for the statistical analysis of meteorological elements.

Added requirements for the demonstration of the development purpose of the project.

Added requirements for the comparison of the pipe diameters of the water conveyance system.

Added requirements for the analysis of operation in coordination with wind power and other new energy bases.

Added the requirement that a functional and safety review be carried out when an existing reservoir is used.

Added requirements limiting the non-uniformity of the velocity distribution at the trash racks of the intake/outlet works, and principles for the arrangement of inspection and maintenance passages of the water conveyance system.

Added the requirement that the inlet valve shall not take part in the discharge regulation during the transient process of the design operating conditions of the water conveyance and power generation system.

Added requirements for the design of the power supply where the station undertakes a black start duty.

Added requirements for the design of the alternating current excitation system of variable speed units.

Added requirements for the design of the interlock between the inlet valve and the tailrace emergency gate.

Added requirements for the design of emergency shutdown of the units and emergency closing of the station emergency gates from within the central control room.

Added requirements for the design of high pressure valve type tailrace emergency gates.

Added the design standard for flood protection of the powerhouse during the construction period.

Added design requirements for the selection and exploitation of material sources.

Added requirements for the selection of spoil areas within the reservoir basin.

Revised the contents of the ice regime investigation and the requirements for ice regime analysis during the operation period.

Revised the requirements for the selection of the rated head.

Revised the requirements for the analysis of initial impoundment and for the design of the operation scheme of reservoir sediment flushing and dispatching.

Revised the requirements for the engineering geological investigation of natural construction materials within the reservoir.

Revised the principles for selecting the design flood standards of the structures.

Revised the requirements for the frost and ice resistance measures of the structures.

Revised the requirements for the hydraulic design of shaft-type intake/outlet works.

Revised the requirements for the layout of the underground powerhouse.

Revised the requirements for the layout of the switchyard, the outgoing line tunnel, the access tunnel to the powerhouse, the oil storage room and the oil treatment room.

Revised the requirements for the design value of the maximum pressure at the spiral case inlet.

Revised the requirements for the design of the station service power supply.

Revised the requirements for the flow velocity through the trash racks.

Revised the design standards for the diversion and flood protection of the upper and lower reservoirs.

This code is administered by the National Energy Administration; it is proposed by and placed under the routine administration of the General Institute of Hydropower and Water Resources Planning and Design, and the Standardization Technical Committee for Hydropower Investigation and Design of the Energy Industry is responsible for the interpretation of its specific technical contents.

Comments and suggestions arising during the implementation of this code should be sent to the General Institute of Hydropower and Water Resources Planning and Design (address: No. 2 Liupukang Beixiaojie, Xicheng District, Beijing; postcode 100120).

Chief development organization of this code: PowerChina Beijing Engineering Corporation Limited.

Participating development organizations of this code: State Grid Xinyuan Company Limited; China Southern Power Grid Peak Regulation and Frequency Modulation Power Generation Company Limited.

Chief drafters of this code: 22 specialists, whose names are printed in Chinese in the original edition.

Chief reviewers of this code: 33 specialists, whose names are printed in Chinese in the original edition.

Publication Information

Energy industry standard of the People's Republic of China, designation NB/T 10072-2018.

ICS classification 27.140; Chinese standard classification code P 59; filing number J418-2018.

The title printed on the cover in Chinese corresponds to the official English title printed below it, Code for Design of Pumped Storage Power Stations.

This code replaces DL/T 5208-2005.

Issued on 29 October 2018 and implemented on 1 March 2019.

Issuing authority: National Energy Administration.

Department in charge of compilation: General Institute of Hydropower and Water Resources Planning and Design.

Approving department: National Energy Administration; effective date 1 March 2019; published in Beijing in 2019.

Announcement of the National Energy Administration

Announcement No. 12 of 2018 of the National Energy Administration.

In accordance with the relevant provisions of the Notice of the National Energy Administration on Issuing the Administrative Measures for Standardization in the Energy Sector (Trial) and the Rules for Their Implementation (Guo Neng Ju Ke Ji [2009] No. 52), and following examination, the National Energy Administration has approved 204 industry standards, headed by Mine Air-Cooled Adjustable Speed Magnetic Coupling, which are hereby issued; among them there are 54 energy standards (NB), 8 petrochemical standards (NB/SH) and 142 petroleum standards (SY).

Attachment: catalogue of industry standards.

Issued by the National Energy Administration on 29 October 2018.

In the attached catalogue of industry standards this code appears under serial number 27: standard number NB/T 10072-2018, title Code for Design of Pumped Storage Power Stations, superseded standard DL/T 5208-2005, approval date 29 October 2018, implementation date 1 March 2019.

Structure of the Code

Chapter 1 General Provisions (page 1) states the purpose of the code, its field of application and the basic principles governing the design of pumped storage power stations.

Chapter 2 Terms (pages 2 to 4) gives the terminology used throughout the code.

Chapter 3 Hydrology (pages 5 to 13) covers general requirements, meteorology, runoff, flood, sediment, the stage-discharge relationship curve, water surface evaporation, ice regime, and the hydrologic telemetry and forecasting system.

Chapter 4 Design of Hydropower Planning (pages 14 to 21) covers general requirements, project purpose and necessity of construction, selection of installed capacities, selection of characteristic water levels, selection of rated heads, comparison of water conveyance system pipe diameters, analysis of sediment, water source analysis and initial impoundment plan, and operation modes and energy indicators.

Chapter 5 Engineering Geological Investigation (pages 22 to 32) covers general requirements, regional geology and seism, and the engineering geological investigation for the upper and lower reservoirs, for the water conveyance system, for the underground powerhouse system, for the shaft-type powerhouse and for natural construction materials in the reservoir.

Chapter 6 Project General Layout and Hydraulic Structure Design (pages 33 to 54) covers general requirements, general layout, upper reservoir and lower reservoir, water conveyance system, and powerhouse system.

Chapter 7 Design of Hydromechanical Systems (pages 55 to 62) covers the pump turbine, the inlet valve, the governor system, transient calculation, the service water supply system, drainage system and fire fighting system, the compressed air system, and the hydraulic monitoring system and unit monitoring.

Chapter 8 Design of Electrical Systems (pages 63 to 68) covers the design of the connection with the power system and the single line diagram, the startup of the reversible unit under pumping mode, the selection of electrical equipment, the station service power supply, and the selection of switchyard types and locations.

Chapter 9 Control, Relay Protection and Communication Systems (pages 69 to 74) covers general requirements, unit automatic control, the computer supervision and control system of the power station, relay protection, and the relevant control circuits and equipment.

Chapter 10 Design of Hydraulic Steel Structure (pages 75 to 78) covers general requirements, the trash racks of the upper and lower reservoirs, the headrace system gates and the tailrace system gates.

Chapter 11 Construction Planning (pages 79 to 92) covers general requirements, construction diversion, material source selection and exploitation, construction planning for the main works, construction accesses and transportation, construction plants and facilities, the construction general layout, and the master construction schedule.

Chapter 12 Economic Evaluation (pages 93 to 95) covers general requirements, national economic evaluation, financial evaluation and comprehensive assessment.

The Explanation of Wording in This Code begins on page 96.

The List of Quoted Standards begins on page 97.

The Addition: Explanation of Provisions begins on page 99.

1 Scope

NB/T 10072-2018 is the Chinese design code for pumped storage power stations, replacing DL/T 5208-2005. A pumped storage plant is the largest form of electricity storage in use: water is pumped to an upper reservoir when power is cheap and released through the same machines to generate when it is dear, and the design has to serve both directions of operation and the frequent, rapid changes between them. The code covers the whole plant. It begins with general provisions, the classification of the station and the design criteria that follow, then the selection of the site and the layout of upper and lower reservoirs, including the impermeable lining that an excavated upper reservoir usually needs and the seepage control around it. The waterway system follows - intakes, headrace tunnel, surge chamber, high pressure shaft and steel-lined penstock, tailrace and its surge chamber - with the hydraulic transient analysis that governs their sizing and the check on the governing stability of the units. The underground powerhouse, transformer cavern and access tunnels are treated with their rock support and ventilation. The reversible pump-turbines, motor-generators, main transformers, switchgear and the control and protection systems have their own chapters, as do the auxiliary systems and the plant's connection to the grid. Construction planning, monitoring instrumentation, fire protection and environmental requirements close the document. It applies to pumped storage projects in China.

1.0.1 This code is formulated in order to standardize the design principles and the technical requirements for pumped storage power stations and to ensure the quality of the engineering design.

1.0.2 This code is applicable to the design of pumped storage power stations.

1.0.3 The design of a pumped storage power station shall meet the requirements of the power system in which it is located as regards peak regulation, valley filling, frequency regulation, phase regulation and emergency standby, so that the power system achieves efficient, safe and stable operation.

1.0.4 According to the needs of the power system and the construction conditions of the project, a pumped storage power station may be designed for a daily, weekly or annual regulation mode of operation.

1.0.5 This code covers the main contents and the overall requirements of the investigation and design work for pumped storage power stations. The specific contents and the depth requirements of the investigation and design work at each stage shall comply with the relevant requirements of the current industry standards NB/T 35009 Code for Compiling Site Selection Planning of Pumped Storage Power Stations, DL/T 5206 Code for Compiling Pre-feasibility Study Report of Hydropower Projects, DL/T 5020 Code for Compiling Feasibility Study Report of Hydropower Projects and DL/T 5212 Code for Compiling Tender Design Report of Hydropower Projects.

1.0.6 In addition to complying with this code, the design of pumped storage power stations shall also comply with the provisions of the current relevant national standards.