DL/T 1766.3: Evolution and historical versions
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(Maintenance guide for water-hydrogen-hydrogen-cooled turbo-generators - Part 5: Maintenance of internal chilled water system)
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DL/T 1766.3-2021
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| DL/T 1766.3-2019 | English | 229 |
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Guideline for maintenance of water-hydrogen-hydrogen cooled turbo generator -- Part 3: Rotor
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DL/T 1766.3-2019
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Basic data | Standard ID | DL/T 1766.3-2021 (DL/T1766.3-2021) | | Description (Translated English) | (Maintenance guide for water-hydrogen-hydrogen-cooled turbo-generators - Part 5: Maintenance of internal chilled water system) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K21 | | Classification of International Standard | 29.160.20 | | Date of Issue | 2021-12-22 | | Date of Implementation | 2022-03-22 | | Issuing agency(ies) | National Energy Administration | DL/T 1766.3-2019: Guideline for maintenance of water-hydrogen-hydrogen cooled turbo generator -- Part 3: Rotor
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Guideline for maintenance of water-hydrogen-hydrogen cooled turbo generator - Part 3.Rotor
ICS 29.160.20
K 21
People's Republic of China Electric Power Industry Standard
Guidelines for overhaul of water-hydrogen-hydrogen cooled turbo generator
Part 3.Rotor overhaul
Refractory materials for boilers in thermal power plants
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terminology...1
4 General...2
5 Rotor body...2
6 Rotor winding...3
7 Slip ring and brush holder...3
8 Exciter...4
9 Test during maintenance...4
Appendix A (informative appendix) Generator rotor maintenance items...5
Appendix B (informative appendix) Structure drawing of generator rotor conductive screw...6
DL/T 1176.3-2019
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation".
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Electric Power Industry Standardization Technical Committee (DL/T C09).
Drafting organizations of this standard. Datang Thermal Power Technology Research Institute, Datang International Power Co., Ltd. Douhe Power Plant, Shanghai Electric Power
Station Equipment Co., Ltd., Harbin Electric Machinery Co., Ltd., Dongfang Electric Co., Ltd., North China Electric Power Research Institute Co., Ltd.,
Inner Mongolia Datang Tuoketuo Power Generation Co., Ltd., Datang East China Electric Power Test Research Institute.
The main drafters of this standard. Wang Jinsong, Yang Haichao, Guo Jinzhao, Wang Jiandong, Shu Wuqing, Cao Fengbo, Su Zhen, Wang Dayu, Xian Zhe
Long, Jiao Xiaoxia, Li Sheng, Cui Yanhong, Dai Chengwei, Li Haifeng, Sheng Mingjun, Sun Shitao, Zhang Jie, Wei Guanghong, Wang Qingxue, Wang Jianjun, Li
Peng and Luan Fuming.
This standard is issued for the first time.
The opinions or suggestions during the implementation of this standard will be fed back to the Standardization Management Center of the China Electricity Council (Baiguang Road 2nd, Beijing)
Article No. 1, 100761).
Guidelines for overhaul of water-hydrogen-hydrogen cooled turbo generator
Part 3 Rotor overhaul
1 Scope
This standard specifies the technical requirements for the overhaul of the rotor of a water-hydrogen-hydrogen cooled turbo-generator.
This standard is applicable to the overhaul of rotors of water-hydrogen-hydrogen-cooled turbo-generators of.200MW and above. Other capacity water-hydrogen hydrogen-cooled steam turbines for power generation
The machine can be implemented by reference.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
DL/T 970 Guidelines for abnormal and special operation and maintenance of large steam turbine generators
DL/T 1525 Fault Diagnosis Guide for Rotor Interturn Short Circuit of Hidden Generator Synchronous Generator
DL/T 1766.1-2017 Water-hydrogen-hydrogen-cooled turbo-generator overhaul guidelines Part 1.General
DL/T 1768 Preventive test procedures for rotating electrical machines
3 Term
The following terms and definitions apply to this document.
3.1
Water-hydrogen-hydrogen cooled turbo generator
The stator winding adopts water internal cooling, the rotor winding adopts hydrogen internal cooling, and the stator core adopts a hydrogen-cooled turbo generator.
3.2
Troubleshooting run till failure; RTF
Unplanned maintenance when the generator fails or fails.
[DL/T 1766.1-2017, definition 3.6]
3.3
A class maintenance
Carry out a comprehensive inspection, diagnosis and repair of the generator stator, rotor and its auxiliary systems to maintain and restore the performance of the equipment and improve
The reliability of the equipment.
[DL/T 1766.1-2017, definition 3.8]
3.4
B class maintenance
Refer to the A-level overhaul scope to check, diagnose and repair the components for the problems of the generator and its auxiliary systems.
[DL/T 1766.1-2017, definition 3.9]
3.5
DL/T 1176.3-2019
C class maintenance
Generally, the generator and its auxiliary systems are inspected, diagnosed, and repaired with emphasis on the state of not pumping the rotor.
[DL/T 1766.1-2017, definition 3.10]
3.6
D class maintenance
Eliminate deficiencies in generators and their auxiliary systems.
[DL/T 1766.1-2017, definition 3.11]
4 General
Before maintenance, technical data such as drawings, operation records, previous maintenance records and spare parts list of the generator should be prepared.
The evaluation of the rotor condition before overhaul should include the following.
a) Generator vibration assessment;
b) Failure impact assessment;
c) Impact assessment of abnormal operation;
d) Impact assessment of peak shaving operation;
e) Evaluation of generator rotor temperature rise;
f) Evaluation of the operation of the slip ring and carbon brushes;
g) Evaluation of shaft voltage and shaft current;
h) Data and alarm records of online monitoring devices such as short circuit between turns and insulation overheating;
i) Conversion of operation time of gas-fired units (refer to Appendix B in DL/T 1766.1-2017).
For generators operating under abnormal conditions, the maintenance of key components should be strengthened according to the evaluation results and the requirements in DL/T 970.
a) For generators with frequent peak adjustments, the inspection of rotor end winding deformation and air duct blockage should be strengthened;
b) For out-of-step, asynchronous, non-full-phase, long-term unbalanced generators, the rotor surface and guard ring overheating conditions and grooves should be strengthened
Wedge inspection
c) For generators that have experienced short-circuit impact and are connected to the grid in different periods, the detection of short-circuit between rotor turns should be strengthened.
d) Check the magnetization of the rotor.
See Appendix A for the maintenance items corresponding to all levels of maintenance. In view of the evaluation results, dismantling, inspection, and test conditions, necessary maintenance items are added.
When troubleshooting, it is necessary to comprehensively analyze factors such as the scope of the fault, the maintenance time and the importance of the equipment in the system, and determine the maintenance items.
During the maintenance process, the records, identification and number of the disassembled parts should be kept, and the inspection and testing of the new replacement spare parts should be made.
5 Rotor body
The inspection of rotor slot wedges, balance screws and balance weights shall include.
a) The appearance of the slot wedge, check for cracks, abnormal marks, and foreign matter in the slot wedge ventilation hole;
b) Check the rounded corners of small teeth, large teeth and crescent sockets for overheating and other abnormal marks;
c) Whether the balance screws and balance weights are loose.
Rotor bearing block inspection should include.
a) Appearance;
b) Ultrasonic flaw detection;
c) Dimensions.
Check whether the slot wedge vents are displaced from the rotor vents, and focus on whether the rotor vents are blocked by foreign matter.
Coupling inspection should include.
a) Visual inspection;
b) Bolt flaw detection;
c) Coupling flaw detection (if necessary).
Retaining ring inspection should include.
a) The outer circle and end surface of the retaining ring;
b) Whether the retaining ring is displaced in the circumferential direction;
c) Ultrasonic flaw detection of retaining ring.
d) Ring bond situation
Check the center ring to check whether the balance weight is loose.
Check the center hole and conduct an air tightness test.
Fan inspection should include.
a) The appearance of the fan base and blades;
b) Check for cracks and wear;
c) Flaw detection.
Check the journal for wear and overheating.
6 Rotor winding
Excitation end lead inspection, mainly to check whether there is deformation and overheating at the end of the lead.
The winding end inspection shall include.
a) Whether the end winding is deformed or displaced;
b) Use an endoscope to check whether the cushion block is displaced or loose (if necessary);
c) Overheating of interlayer insulation.
Conductive rod and conductive screw inspection. Refer to Appendix B for the structure of conductive rods and conductive screws during maintenance.
In conjunction with the rotor ventilation test, check the rotor ventilation duct.
7 Collector ring and brush holder
The slip ring inspection shall include.
a) Check the appearance and cleanliness of the collector ring to see if there is discoloration, overheating, or dents;
b) Check the outer diameter of the slip ring;
c) Check and clean the groove of the collector ring;
d) Measuring the insulation resistance of the slip ring;
e) Check the cleanliness of the outer cover of the slip ring and clean the filter;
f) Inspection of slip ring bearing seat;
g) Measurement of insulation resistance of bearing seat to ground;
h) Bearing shell flaw detection;
i) Check the fan surface condition;
j) Check the tightness of bolts at electrical connections;
k) Whether the fasteners and balance weights are loose.
Carbon brush and brush holder inspection should include.
a) Inspection of silver plating of brush holder;
b) Check the pressure of the carbon brush spring, whether the spring is broken;
c) Inspection of carbon brush wear;
d) Check the jam of the carbon brush in the brush grip;
e) Check the connection between the carbon brush body and the braid;
f) Toner blowing and brush holder cleaning;
g) Measurement of insulation resistance of brush holder to ground;
Brush holder fastener inspection, brush holder ventilation duct cleaning inspection.
8 Exciter
Before the disassembly and inspection of the exciter, the following tasks should be completed.
a) Measurement of air gap between stator and rotor of main and auxiliary exciter;
b) Measurement of exciter rotor sloshing (such as excessive vibration);
c) Measurement of the gap between the oil baffle and the rotor;
d) Inspection of temperature measuring components.
The inspection of the rotor of the main exciter should include.
a) Rotor appearance inspection;
b) Measure insulation resistance;
c) Fuse appearance inspection, cleaning, DC resistance measurement;
d) Measurement of insulation resistance and DC resistance of armature windings;
e) Measurement of insulation resistance of rectifier components to rectifier disk;
f) Reverse leakage test of rectifier components;
g) Measure the appearance of the slip ring and check the electrical connection;
h) Clean the rotor, and retest the insulation resistance after cleaning;
i) Permanent magnet machine rotor flux density inspection;
j) Check the appearance of the magnetic steel;
k) Check the appearance of the armature insulation for cracks, delamination and other abnormalities;
l) Check the appearance of the exciter shaft.
The main exciter, exciter, permanent magnet machine stator inspection should include.
a) Stator appearance inspection;
b) Measurement of insulation resistance of stator windings;
c) Measurement of DC resistance of stator winding.
Bearing inspection should include.
a) Visual inspection;
b) Color inspection of bearing bush;
c) Measurement of insulation resistance of bearing seat to ground.
Check and clean the ventilation hood.
9 Test during maintenance
The test during the maintenance process should be based on DL/T 1768 and the manufacturer's regulations.
When there is an abnormality in the slot wedge inspection, corresponding metallographic inspection items can be added.
The detection and positioning of the short circuit between the rotor winding turns can be based on DL/T 1525.
Appendix A
(Informative appendix)
Generator rotor maintenance project
The generator rotor maintenance items are shown in the attached table A.1.
Attached Table A.1 Generator rotor maintenance items
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