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GB/T 9652 consists of the following two parts:
— GB/T 9652.1 Specification of Hydraulic Turbine Governing Systems;
— GB/T 9652.2 Testing Specification of Hydraulic Turbine Governing Systems.
This part is Part 1 of GB/T 9652.
This part is drafted in accordance with the rules given in the GB/T 1.1-2009
This part replaces GB/T 9652.1-2007 Specifications of Control Systems for Hydraulic Turbines. The following technical deviations have been made with respect to the GB/T 1634.1-2004 (the previous edition):
— modification and supplement of the Scope (see Clause 1);
— modification and supplement of the operating conditions (see 3.3 and 3.4;3.3 of Edition 2007);
— deletion of the relevant provisions of mechanical hydraulic governor and analog circuit electro-hydraulic governor by considering that both mechanical hydraulic governor and analog circuit governor have been discontinued in China for more than ten years, and the current turbine governor products are microcomputer governor (see Table 2; 4.4.3.3, 4.6.1 and Table 2 of Edition 2007);
— modification of the assessment requirements for speed dead zone (see 4.1.3);
— addition of the technical requirements for hydraulic turbine governing systems for pump (see 4.3.12);
— adjustment and supplement of the assessment indexes of manual and automatic no-load frequency swing (see 4.2.1, 4.2.2 and 4.2.3);
— adjustment of the assessment indexes of servomotor stationary time, in view of the actual status of servomotor stationary time in the hydraulic turbine governing systems of large turbine units (see 4.2.4);
— adjustment and supplement of the assessment requirements for 100% load rejection (see 4.2.5);
— addition of the technical requirements for primary frequency control and power regulation (see 4.2.6 and 4.2.7);
— addition of the technical requirements for isolated network regulation (see 4.2.8);
— modification of the volumetric requirements for oil to be used in pressure tanks/accumulators (see 4.4.2);
— modification of the starting conditions of the standby pump (see 4.4.5 and 4.4.10);
— addition of the requirements for classification of pressure levels (see 4.4.12);
— addition of the index requirements for the start interval of oil pump motor (see 4.4.14);
— deletion of the provisions of governor without pressure tank (see 4.6.7 of Edition 2007);
— addition of the technical requirements for impulse hydraulic turbine governing system and hydraulic turbine governing system controlled by pressure regulating valve (see 4.3.10 and 4.3.11);
— addition of the technical requirements for the governing system of bidirectional tidal tubular turbine units (see 4.3.13);
— addition of the index requirements for servomotor position drift value under manual operating conditions (see 4.3.19);
— addition of the index requirements for oil pressure drift of the governing system (see 4.3.20);
— adjustment and supplement of the technical requirements for each device/component module of the governor and oil pressure device (see 4.5).
This part has been redrafted and with reference to International Standard IEC 61362:2012 Guide to Specification of Hydraulic Turbine Governing Systems, and it is not equivalent to IEC 61362:2012.
This part was proposed by China Electrical Equipment Industrial Association.
This part is under the jurisdiction of the SAC/TC 175 (National Technical Committee 175 on Water Turbine of Standardization Administration of China).
The previous editions of this part are as follows:
— GB 9652-1988;
— GB/T 9652.1-1997, GB/T 9652.1-2007.
Specification of Hydraulic Turbine Governing Systems
1 Scope
This part of GB/T 9652 specifies the operating conditions, specifications, scope of supply and spare parts, drawings and materials, marking, packaging, transportation and storage, and warranty period of hydraulic turbine governing systems.
This part is applicable to the design, manufacture and acceptance of hydraulic turbine governing systems (including hydraulic turbine governing systems for pumps).
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 150.1 Pressure Vessels — Part 1: General Requirements
GB/T 150.2 Pressure Vessels — Part 2: Materials
GB/T 150.3 Pressure Vessels — Part 3: Design
GB/T 150.4 Pressure Vessels — Part 4: Fabrication, Inspection and Testing, and Acceptance
GB/T 191 Packaging — Pictorial Marking for Handling of Goods
GB/T 3047.1 Series of Basic Dimensions of Panels, Rack and Cabinets for Vertical Increment of 20 mm
GB/T 3797 Electrical Control Assemblies
GB/T 4588.1 Sectional Specification: Single and Double Sided Printed Boards with Plain Holes
GB/T 4588.2 Sectional Specification: Single and Double Sided Printed Boards with Plated-through Holes
GB/T 8564 Specification Installation of Hydraulic Turbine Generator Units
GB/T 10886 Three Screw Pumps
GB 11120-2011 Lubricating Oils for Turbines
GB/T 11805 Basic Specifications of Automatic Control Components (Devices) and Their Related System for Hydroturbine-generating Sets
GB/T 14039-2002 Hydraulic Fluid Power — Fluids — Method for Coding the Level of Contamination by Solid Particles
GB/T 17626.4 Electromagnetic compatibility — Testing and measurement techniques — Electrical fast transient/burst immunity test
GB/T 20663 Accumulators
GB/T 25133 Hydraulic Fluid Power Systems — Methods of Cleaning Lines by Flushing
DL/T 1245 Technical Guide for Hydraulic Turbine Regulating System in Grid
JB/T 4711 Coating and Packing for Pressure Vessels Transport
JB/T 7036 Hydraulic Pressure-insulation Type Accumulators — Technical Requirements
JB/T 7041 Hydraulic Gear Pumps
JB/T 8091 Testing Methods for Screw Pumps
3 Operating Conditions
3.1 The maximum stroke of servomotor is compatible with the full opening of the guide blade. For medium, small and extra-small governors, the actual maximum opening of the guide blade shall correspond to at least 80% of the maximum stroke of the servomotor. The governor is consistent with the selected operating capacity of the oil pressure device.
3.2 Installation, welding, cleaning and inspection of pipeline shall comply with the requirements of GB/T 8564 and GB/T 25133.
3.3 The normal operation of hydraulic turbine generator units shall meet the following requirements:
a) the turbine shall operate under the conditions specified by the manufacturer;
b) the signal source of frequency or speed measurement, turbine water guide mechanism, blade operating mechanism, injection needle and reversing mechanism, pressure regulating valve operating mechanism, governing shaft and feedback drive mechanism shall be free from any manufacturing or installation defects, and shall meet the technical requirements of each component;
c) the corresponding automation components shall meet the requirements of GB/T 11805.
3.4 The water inertia time constant (Tw) of the turbine diversion system without pressure regulating valve is no more than 4s. For turbine diversion system with pressure regulating chamber, the stable section area of pressure regulating chamber shall be larger than the critical stable section area. The unit's inertia time constant (Ta) shall not less than 3 s for pressure turbine units, and not less than 2 s for impulse turbine units. Meanwhile, the ratio (unit inertia ratio R1) of water inertia time constant (Tw) to unit's inertia time constant (Ta) shall not be greater than 1.2.
3.5 The altitude of use site shall not exceed 2 500 m.
3.6 The highest air temperature around the governor at different altitudes is shown in Table 1, and the lowest air temperature is 5℃.
Table 1 Highest air temperature at different altitudes
Altitude (m) ≤1 000 1 000 to 1 500 1 500 to 2 000 2 000 to 2 500
Highest temperature (℃) 40 37.5 35 32.5
3.7 Air relative humidity: the maximum monthly average relative humidity of the wettest month shall not exceed 90%, and no condensation. Meanwhile, the minimum monthly average temperature of the wettest month shall not exceed 25℃.
3.8 The quality of oils used in governing systems shall comply with the requirements of GB 11120-2011, 32# to 68# turbine oil, anti-wear hydraulic oil or the same type of oil with similar viscosity. The cleanliness level of the oils shall not be lower than GB/T 14039-2002, Grade 21/18/15. The temperature range of oils in operating is 10 ℃ to 50 ℃.
3.9 Before the regulation test, the possible defects of the governing system, such as dead zone, block resistance of the mechanical drive system, and possible air in the hydraulic pipe, elements and components, shall be eliminated.
Note: all static and dynamic performance indicators specified in this part shall be formulated under the conditions of this clause. If the requirements are not met, the relevant indicators may be negotiated negotiated between the supplier and the purchaser.
4 Specifications
4.1 General
4.1.1 Products shall be manufactured in accordance with the drawings and documents approved by the specified procedures.
4.1.2 The operating capacity of the servomotor of governing system shall be guaranteed to reach the specified design value.
4.1.3 The static characteristics of governing system shall meet the following requirements:
a) the static characteristic curve shall be approximate to a straight line.
b) when permanent speed droop bp=4%, the swing value (Δy) of servomotor, measured at the speed dead zone (ix) of the main servomotor under the turbine static and constant input speed signal, shall not exceed the specified value of Table 2.
Foreword II
1 Scope
2 Normative References
3 Operating Conditions
4 Specifications
5 Scope of Supply and Spare Parts
6 Drawings and Documents
7 Marking, Packaging, Transportation and Storage
8 Warranty Period
