GB/T 7894-2023 (GB/T 7894-2009) PDF English
US$205.00 · In stock · Download in 9 secondsGB/T 7894-2009: Fundamental technical specifications for hydro generators [including 2015 MODIFICATION 1] Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Obsolete GB/T 7894: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 7894-2023 | English | 879 |
Add to Cart
|
7 days
|
Fundamental technical requirements for hydrogenerators
| Valid |
| GB/T 7894-2009 | English | 205 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Fundamental technical specifications for hydro generators [including 2015 MODIFICATION 1]
| Obsolete |
| GB/T 7894-2001 | English | 639 |
Add to Cart
|
5 days
|
Fundamental technical specifications for hydro generators
| Obsolete |
| GB/T 7894-1987 | English | RFQ |
ASK
|
3 days
|
Fundamental technical requirements for hydraulic turbine generators
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 7894-2009
GB/T 7894-2009: Fundamental technical specifications for hydro generators [including 2015 MODIFICATION 1]
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT7894-2009
K21
National Standard of the People's Republic of China
Replace GB/T 7894- 2001
Fundamental Technical Specifications for
Hydro Generators
ISSUE ON. NOVEMBER 30, 2009
Implemented on: APRILL, 2010
Issued by General Administration of Quality Supervision, Inspection and Quarantine
of the People's Republic of China
Standardization Administration of the People's Republic of China
Foreword
This standard is formulated in reference to IEC 60034-1 .2004 "Rotating Electrical Machines-
Rating and Performance" (11th edition). The technical indexes of some provisions in this standard are
higher than the requirements of IEC 60034-1; the ones of some provisions in this standard are
consistent with the levels of IEC 60034-l.This standard is also in reference to the relevant contents in
Std IEEE C50.12™-2005 "Technical Requirements for the 50Hz and 60Hz Salient Pole Synchronous
Generator and Generator/Motor with the Rated Capacity 5MVAAnd Above".
This standard replaces GB/T 7894-2001 "Fundamental Technical Specifications for Hydro
Generators" (hereinafter referred to as former standard).
Compared with GB/T 7894-2001, this standard has the following main changes.
-Changes and adjustments are carried out, based on the overall frame of the former standard,
due to the imbalanced chapter and article contents and inconvenient consultation and quotation of the
former standard. This standard consists of 19 chapters, 13 tables and 3 Appendixes;
--The capacity scope applicable in this standard are specified for the first time;
--Voltage and frequency variation scope during operation, stator and rotor winding temperature
rise, adjustments to limits of temperature rise at non-reference operating conditions and ratings, and
total harmonic distortion factor of stator line voltage waveform are identical to the corresponding
provisions of IEC 60034-1 .2004 (11th edition);
--The following contents are supplemented and consummated. scope, normative references,
operating environment conditions, efficiency and loss, electrical parameters and time constants, withstand
voltage test standard, allowable vibration limit of each position, allowable deflection limit of bearing
frame, overall structure, main structural components, ventilation and cooling system, braking system,
fire extinguishing system, detecting system, devices and elements, supply scope, factory and field test,
trial operation and guarantee period. ;
--The following contents are revised. rated power factor, rated voltage, capacity, insulation
performance and withstand voltage test, special operating requirement, synchronous merging system,
corona starting voltage of the complete machine, electrical conductivity of water, marking, packing,
transportation and storage;
--Some of the following indexes are adjusted and improved. temperature rise limit of air-
cooling stator winding, normal dielectric loss tangent limit of stator winding, withstand voltage test
standard of winding and allowable maximum temperature of thrust bearing Babbitt bearing shoe;
--Such contents as ventilation cooling system classification and water direct cooled rotor
winding are deleted .
Appendix A, Appendix Band Appendix C of this standard are informative.
This standard was proposed by China Electrical Equipment Industry Association.
This standard is under the jurisdiction of the Subcommittee on Generator of National Technical
Committee on Electric Rotating Machinery of Standardization Administration of China (SAC/TC
26/SC 2).
Fundamental Technical Specifications for Hydro Generators
1 Scope
This standard specifies the general technical requirements, supply scope, standby redundancy,
special tools, factory and field test, and trial operation requirements for the hydro generators and their
auxiliary equipments.
This standard is applicable to the 50Hz three-phase salient pole synchronous generators (hereinafter
referred to as hydro generators) directed connected with the hydraulic turbines and with rated capacity
25MVA and above. Outlet hydro generators with rated capacity less than 25MVA or frequency 60Hz
may be implemented in reference to this standard.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute
provisions of this standard. For dated reference, subsequent amendments to (excluding correction to),
or revisions of, any of these publications do not apply. However, the parties to agreements based on
this standard are encouraged to investigate the possibility of applying the most recent editions of the
standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 156 "Standard Voltage" (GB/T 156-2007, IEC 60038.2002, MOD)
GB 755-2008 "Rotating Electrical Machines-Rating and Performance" (IEC 60034-1.2004, IDT)
GB/T 1 029 "Test Procedures for Three-phase Synchronous Machines"
GB/T 2900.25 "Electrotechnical Terminology-Rotating Electrical Machines"
GB/T 5321 "Measurement of Loss and Efficiency for Electrical Machine by the Calorimetric
Method" (GB/T 5321-2005, IEC 60034-2A.1974, IDT)
GB IT 7 409.3 "Excitation System for Synchronous Electrical Machines-Technical Requirements
of Excitation System for Large and Medium Synchronous Generators"
GB/T 8564 "Specification Installation of Hydraulic Turbine Generator Units"
GB/T 10069. 1 "Measurement of Airborne Noise Emitted by Rotating Electrical Machines and the
Noise Limits-Part 1. Method for the Measurement of Airborne Noise Emitted by Rotating Electrical
Machines"
GB/T 13394 "Letter Symbols to be Used in Electrical Technology-Symbols for Quantities to be
Used for Rotating Electrical Machines"
GB/T 20835 "Guides for Magnetication Test of Generator Stator Core"
GB 50193 "Code of Design for Carbon Dioxide Fire Extinguishing Systems"
GB 50219 "Code of Design for Water Spray Extinguishing Systems"
JB/T 6204-2002 "Specifications for Withstanding Voltage Test Oil Stator Coil and Winding
Insulation of High Voltage AC Machines"
JB/T 8439 "Corona-proof Specification of High Voltage Rotating a.c Machines Used in High
Altitude"
JB/T 8660 "Specification of Package, Transportation and Storage for Electro-hydraulic Machine
Set"
JB/T 10098 "Impulse Voltage Withstand Levels of Form-wound Stator Coils for Rotating a. c.
Machines"
SL 321-2005 "Fundamental Technical Specifications for Large and Medium Hydro generators"
DLIT 507 "Start-up Test Code for Hydraulic-turbine and Generator Units"
DLIT 730-2000 "Specifications for Imported Equipments of Hydro-generators and Generator-
motors"
IEC 60243-1.1998-01 (2nd edition) "Electrical Strength of Insulating Materials-Test Methods-
Part 1. Tests at Power Frequencies"
3 Terms and Definitions
For the purpose of this standard, the terms and definitions in the relevant standards such as GB
755-2008 and GB/T 2900.25 apply. Common physical quantity symbols are detailed in GB/T 13394.
4 Operating Environment Conditions
Unless otherwise specified, the hydro generators shall be able to carry out continuous rated
operation under the following operating environment conditions.
a) Altitude does not exceed 1 OOOm (subject to the elevation of the Yellow Sea);
b) Cooling air temperature does not exceed 40'C ;
c) Inlet temperature in air cooler, oil cooler and heat exchanger of water direct cooled stator
winding does not be greater than 28 ·c and less than 5 ·c.;
d) Inlet temperature of water direct cooled stator winding is 30'C~40 'C ; at 25'C, electrical
conductivity of water is not greater than 0.4.uS/cm~2.0.uS/cm, pH value is 6.5~9.0, and hardness is
less than 2.umol/L;
e) Installed in the sheltered plant;
f) Relative humidity in the plant does not exceed 85%;
g) The earthquake intensity and corresponding design acceleration values at the application site
are detailed in Table 1.
Table 1 Design Acceleration Values of Different Earthquake Intensity
Earthquake intensity/degree
Design acceleration
Horizontal direction 0.2g 0.25g 0.4g
Vertical direction O.lg 0.125g 0.2g
Note. g is the gravity acceleration at the application site.
at rated voltage, rated speed, specified power factor and different capacity operating condition. Weighted
average efficiency guarantee value shall be specified in the special technical agreement. Weighted
average efficiency of hydro generators is calculated according to Formula (1), and the weighting
coefficient therein is provided by the user.
(1)
Where A, B, C, ...--Weighting coefficient corresponding to the specified power factor and
capacity operating condition, A+ B+C+...= 1;
'71, 172, 173 ...--Efficiency value colTesponding to the rated voltage, rated speed, specified
power factor and different capacity operating condition.
5.6.3 Loss
The loss and efficiency of hydro generators may be measured by the calorimetric method m
reference to GB/T 5321, and the loss includes.
a) Copper loss of stator winding;
b) Copper loss of rotor winding;
c) Iron core loss;
d) Wind loss and friction loss;
e) Guide bearing loss;
f) Thrust bearing loss (only taking into account the loss value allocated to the rotating parts of
hydro generators);
g) Stray loss;
h) Excitation system loss (including excitation converter, rectifier and voltage regulator loss);
i) Electric brush electricity and friction loss;
j) Other loss (including thrust bearing outer circulation oil pump and applied cooling fan power);
k) Water direct cooled system loss (if any).
Note. In order to determine the f R loss value of each winding, the DC resi stance of winding shall be converted to the value
corresponding to the reference operating temperature of insulation class indicated on the nameplate of hydro generators. If the
temperature rise or rated temperature is specified acc...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
|