The standard is prepared based on the GB/T 1.1-2009 Directives for Standardization - Part 1： Structure and Drafting of Standards.
This standard is a revision of DL/T 563-2004 Code of electro-hydraulic regulating system andunit for hydraulic lurbines. Majortechnical changes include：
-Applicable servomotor capacity is changed from 3000N-m or above to 350N-m or above；
-Terms and definitions have been revised and added；
-The application conditions have been revised；
-Clauses concerning hydraulic turbine governing system ofreversible pump-turbine have been added；
-Technical requirements concerning the hydraulic turbine governing system of impulse unit and turbine with the control ofpressure regulating value have been added；
-Speed dead band requirement has been revised；
-Position drift of servomotor at manual operation mode has been added；
-Permissible range ofno-load speed swing at manual/automatic operation mode has been revised；
-Technical requirements for dynamic response ofno-load disturbing have been added；
-Pump start-up interval time requirement has been added；
-The examination index of servomotor dead time has been classified and adjusted；
-Technical requirements in regard to primary frequency control and isolated network regulation have been added；
-Examination requirements of 1OO%load rejection have been revised；
-Requirements for oilleakage and static oil consumption have been added；
-Performance requirements of electrical part， mechanical-hydraulic part and oil pressure supply unit have been revised；
-Structure， component and technological process requirements have been revised；
-Subscript and Special Symbol ofthe version 2004 in Annex A.2has been deleted；
-Capacity of the pressure vessel of oil pressure supply unit has been revised.
This professional standard replaces DL/T 563-2004 Code of electro -hydraulic regulating system andunit for hydraulic turbines from the implementation date ofthis standard.

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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Applicationconditions
5 Technicalrequirements
5．1 Systemrequirements
5．2 Performancerequirements
5．3 Detection， signal and parameter display
5．4 Structure， component and technologicalprocess
6 Testing and acceptance
6．1 Testing
6．2 Acceptance
7 Packaging， transport and storage
Annex A （Normative） capacity ofthe pressure vessel ofoil pressure supply unit

The standard is prepared based on the GB/T 1.1-2009 Directives for Standardization - Part 1： Structure and Drafting of Standards.
This standard is a revision of DL/T 563-2004 Code of electro-hydraulic regulating system andunit for hydraulic lurbines. Majortechnical changes include：
-Applicable servomotor capacity is changed from 3000N-m or above to 350N-m or above；
-Terms and definitions have been revised and added；
-The application conditions have been revised；
-Clauses concerning hydraulic turbine governing system ofreversible pump-turbine have been added；
-Technical requirements concerning the hydraulic turbine governing system of impulse unit and turbine with the control ofpressure regulating value have been added；
-Speed dead band requirement has been revised；
-Position drift of servomotor at manual operation mode has been added；
-Permissible range ofno-load speed swing at manual/automatic operation mode has been revised；
-Technical requirements for dynamic response ofno-load disturbing have been added；
-Pump start-up interval time requirement has been added；
-The examination index of servomotor dead time has been classified and adjusted；
-Technical requirements in regard to primary frequency control and isolated network regulation have been added；
-Examination requirements of 100%load rejection have been revised；
-Requirements for oilleakage and static oil consumption have been added；
-Performance requirements of electrical part， mechanical-hydraulic part and oil pressure supply unit have been revised；
-Structure， component and technological process requirements have been revised；
-Subscript and Special Symbol ofthe version 2004 in Annex A.2has been deleted；
-Capacity of the pressure vessel of oil pressure supply unit has been revised.
This professional standard replaces DL/T 563-2004 Code of electro -hydraulic regulating system andunit for hydraulic turbines from the implementation date ofthis standard.
This standard is proposed by the China Electricity Council.
This standard is under the jurisdiction of the Standardization Technical Committee for Hydropower Station Automation of Power Industry （TC-HSA）.
Drafting organizations： China Institute of Water Resources and Hydropower Research， Changjiang Control Equipment Research Institute， Hunan Electric Power Corporation Research Institute， Science Research
Institute of Shanxi Electric Power Company， State Grid Electric Power Research Institute， Harbin Electric Machine Factory Co.， Ltd.
The main drafters： Zhang Jian-ming， Pan Xi-he， Meng Zuo-hong， Li Hua， Cai Wei-jiang， Piao Xiu-ri.
Translating organizations： China Institute of Water Resources and Hydropower Research， China Three
Gorges Corporation， China Yangtze Power Co.， Ltd.， Electric Power Research Institute of Guizhou Power Grid Co.， Ltd.， State Grid Electric Power Research Institute， Guangdong Hydropower Group Co.， Ltd.
Translated and reviewed by： Zhang Jianming， Zhao Shaoxing， Xie Qiuhua， Gao Xiaoguang， Zhang Runshi，
Li Na， Zhang Zhiyu， Zhang Jianguo， Wang Cong.
Any opinion or suggestion regarding this code during its implementation please feed back to the Standardization Management Center of the China Electricity Council （No.l， Lane 2， Baiguang Road， 100761，Beijing， China）.