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DL/T 1766.2-2019: (Guide for the inspection of hydro-hydrogen-hydrogenated steam turbine generators - Part 2:)
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(Guide for the inspection of hydro-hydrogen-hydrogenated steam turbine generators - Part 2:)
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DL/T 1766.2-2019
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Basic data | Standard ID | DL/T 1766.2-2019 (DL/T1766.2-2019) | | Description (Translated English) | (Guide for the inspection of hydro-hydrogen-hydrogenated steam turbine generators - Part 2:) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K21 | | Word Count Estimation | 28,248 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | DL/T 1766.2-2019: (Guide for the inspection of hydro-hydrogen-hydrogenated steam turbine generators - Part 2:)
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Guideline for maintenance of water-hydrogen-hydrogen cooled turbo generator-Part 2.Status
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 2.Stator 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 Disassembly of the generator...3
6 Maintenance of stator core...3
7 Maintenance of stator winding...4
8 Insulation water pipe and catchment ring inspection...5
9 Outlet sleeve and main lead...5
10 Inspection of end cover, bearing and sealing shoe system...5
11 Temperature measuring element...6
12 Test during maintenance...6
13 Reinstallation of generator...6
14 Overall air tightness check...6
Appendix A (informative appendix) Maintenance items corresponding to all levels of maintenance...7
Appendix B (informative appendix) The steps for extracting the rotor of a 600MW water-hydrogen-hydrogen-cooled generator using the "double crane-reverse chain slider method"...8
Appendix C (informative appendix) End structure and component diagram...15
Appendix D (informative appendix) "Single crane crane-double reverse chain slider method" for a 600MW water-hydrogen hydrogen-cooled generator through the rotor..18
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, Cui Yan
Ting, Xian Zhelong, Jiao Xiaoxia, Lei Yu, Li Sheng, Cui Yanhong, Sheng Mingjun, Dai Chengwei, Li Haifeng, Wei Guanghong, Wu Junliang, Wang Jianjun, Ren
Zhigang.
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 2 stator maintenance
1 Scope
This standard specifies the technical requirements for the overhaul of the stator part of the water-hydrogen-hydrogen cooled turbo generator.
This standard applies to the overhaul of the stator 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 298 Guidelines for Detection and Evaluation of Corona at the End of Generator Stator Winding
DL/T 607 Water and hydrogen leakage inspection of steam turbine generator
DL/T 970 Guidelines for abnormal and special operation and maintenance of large steam turbine generators
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
JB/T 6227 Hydrogen-cooled motor air tightness inspection method and evaluation
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
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 stator condition before maintenance should include the following.
a) Generator vibration assessment;
b) Failure impact assessment;
c) Impact assessment of abnormal operation;
d) Evaluation of the temperature rise of each part of the generator stator;
e) Hydrogen leakage from the generator (refer to DL/T 607 for calculation method);
f) Hydrogen purity, frequency of hydrogen discharge and supplementation, and pollution discharge;
g) Evaluation of accuracy of temperature measuring components;
h) Trend analysis of hydrogen content in the fixed cold water tank;
i) Data and alarm records of the online monitoring device;
j) Conversion of operating hours of gas-fired units (refer to Appendix B in DL/T 1766.1-2017).
For generator base and/or bearing housing vibration exceeding the alarm value, the following principles should be followed.
a) For generators with large vibrations in the frame and bearing housing, check the basic secondary grouting conditions based on the vibration data measured during operation.
Condition, seat plate vibration, end wear and core vibration isolation;
b) For generators with large bearing seat vibration, the bearing shell and related installation dimensions, bearing seat and end cover, bearing shell and bearing seat ball
Check the surface contact situation;
c) For generators with large stator frame vibration caused by rotor vibration, if the stator frame vibration is related to the load, it should be
Check the air gap between the rotor and the stator. If there is a correlation between rotor vibration and reactive load, the rotor should be strengthened
Check the wind circuit and short circuit between turns.
For generators that have experienced near-area short-circuits, lightning impulses, and single-phase grounding of the sending line, the following parts should be checked in the latest maintenance based on the evaluation results
Bit key check.
a) The tightening of the end windings;
b) The insulation integrity of the notch at the end;
c) Inspection of insulated water pipes and catchment rings.
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 that frequently run in phases, the inspection of side cores, pressure fingers and pressure rings should be strengthened;
b) For generators that have experienced severe out-of-step and de-excitation asynchronous operation, the inspection of the fastening of the stator winding ends should be strengthened. Focus
Check looseness, wear, and changes in the dynamic characteristics of the end;
c) For generators with frequent peak shaving operation, the tightening of the end windings, the tightening of the winding slots and the inspection of the iron core should be strengthened.
For units that have undergone capacity-increasing modification, the natural frequency at the end of the generator stator is within the range of the noticeable frequency value or the online monitoring of the vibration amplitude is large,
The inspection of end fastening and wear should be strengthened.
The maintenance items corresponding to all levels of maintenance are shown in Appendix A, and maintenance items can be added when necessary.
When troubleshooting, based on the evaluation results, a comprehensive analysis of factors such as the scope of the fault, the maintenance time, and the importance of the equipment in the system should be determined to determine the
Repair the project.
During the maintenance process, the records, identifications and numbers of the disassembled parts should be kept, and the newly replaced spare parts should be inspected and tested.
When entering the generator stator inspection and repair control area, the following requirements should be met.
a) The dress code should comply with the regulations and personnel registration should be carried out;
b) All tools and spare parts entering the control area have brought in and brought out records;
c) The generator stator body should have necessary dust-proof covering facilities;
d) Fences should be installed in the generator stator control area to prevent non-maintenance personnel from entering.
5 Disintegration of the generator
The disassembly process of the generator is as follows.
a) Hydrogen replacement;
b) The shaft system is separated. Contains the following.
1) Before loosening the counter-wheel bolts, check and record the jump of the slip ring, the jump of the coupling, and the torque of the connecting bolt;
2) After loosening the bolts on the wheel, check and record the runout of the outer circle and end face of the coupling;
3) Check and record the generator shaft center;
c) Measure and record the installation dimensions of the shafting. Contains the following.
1) Clearance of outer oil baffle plate;
2) Clearance between bearing bush and rotor;
3) Radial clearance of the sealing bush;
4) The gap between the oil baffle of the seal bearing and the rotor;
5) Clearance of bearing top block;
6) Assembling gap between upper and lower end covers;
d) Removal and plugging of the external pipeline of the end cover;
e) Remove the oil seal bearing end cover parts;
f) Removal and cleaning of electrical leads;
g) Remove the carbon brush holder or exciter;
h) Check and record the rotor position. Record the following.
1) The distance between the end of the protective ring at the excitation end and the first gear of the iron core;
2) The distance between the steam end face of the rotor coupling and the steam end frame end face;
3) The distance between steam end coupling and steam turbine coupling;
4) Installation clearance of guide vane seat, wind guide ring and inner end cover;
i) Pump the rotor. The typical method is shown in Appendix B;
j) Remove and inspect the cooler. Contains the following.
1) Cooling pipeline inspection;
2) Descale treatment of cooling pipeline;
3) Tightness inspection.
6 Maintenance of stator core
Visual inspection of the stator core (including the back of the core). Should check.
a) Check the inner bore of the stator core for foreign matter, metal or insulating powder, oil, rust, and wear;
b) Whether the surface of the inner bore of the stator core is discolored, bruised or warped;
c) Check the integrity of stepped tooth bonding, focusing on checking whether there is deformation, looseness, or broken teeth;
d) Whether there is any deformation, abrasion or sludge at the joint between the core and the slot wedge
e) Check for discoloration or rust on the back of the iron core, check the elastic positioning ribs and fasteners.
Check and record the tightness of the stator core. Use a dynamometer of ventilated channel steel or iron core tightness inspection device to check the tightness between the teeth pieces
check. The core inspection should cover the ends and middle of the core on both sides of the steam excitation. The test data and location shall be indicated in the record.
Finger pressing and pressing ring inspection. Should check.
a) Whether there is local overheating, cracks, deformation, and displacement;
b) Visually inspect the gap between the pressing finger, the pressing ring and the iron core.
Copper shield (magnetic shield) inspection. Should check.
a) Whether there is local overheating, cracks, deformation, and displacement;
b) Check the bolt tightening state.
Check the insulation and torque of the threaded screw. Should check.
a) Detect the insulation of the through-core screw to the ground;
b) Detect the remaining tight force of the threaded screw;
c) Check the tightness of the connection between the positioning rib and the base.
Clamping ring. Should check.
a) For the bolt fastening structure, check the state of the clamp ring fastening bolts;
b) For the welded fastening structure, check the welding seam of the clamping ring, including the welding with the positioning rib and the spring plate.
Air gap partition and wind zone partition inspection. Should check.
a) Check the tightness and clearance of the fastening bolts of the air gap partition;
b) Check whether the partition of the wind zone is damaged and fixed.
Check the ventilation duct and machine base. Should check.
a) Foreign matter, oil pollution and deformation in the ventilation duct;
b) Check the abnormal condition of the welding seam of the machine base;
c) Displacement inspection of machine base and foundation;
d) Inspection of ventilation channel steel.
7 Maintenance of stator winding
The maintenance principle is.
a) The maintenance of windings should be carried out according to the design features and structure of the generator stator windings;
b) The focus of the overhaul is the wear condition of the generator stator winding end and the integrity of each component. Typical structure and component names of the end
See Appendix C.
Inspection of end windings, fasteners and leads. Should check.
a) Whether there are cracks, discoloration, looseness or wear in the winding insulation at the outlet slot;
b) Whether the winding involute has cracks and traces of overheating;
c) Whether there are corona and discharge traces on the anti-corona layer at the involute of the winding exit slot;
d) Winding involute and tie wire or pressure plate, whether there is yellow powder or sludge;
e) Whether there is yellow powder or sludge at the interface between the winding and the conformal felt;
f) Whether the fasteners at the end of the steam and the excitation end are loose, the safety gasket is displaced, the insulating box is displaced and other abnormal conditions;
g) The tightening state of the pressure plate screw, whether the locking gasket is layered or cracked, and whether the locking screw is loose;
h) The tightening state of the screws on the end brackets and positioning parts. Measure the necessary clearance;
i) Check and record the tension wedge moment, check and record the gap of the tension wedge washer;
j) Insulation box inspection and reinforcement;
k) Inspection of end pads and straps;
l) Whether the end pads and the notch pads are loose or displaced, the straps on the pads are not damaged or broken, and whether the epoxy mud is cracked or removed
drop;
m) Whether the cable tie is loose, worn, broken, etc.;
n) Whether there is any damage to the insulation of the lead wires and connecting wires, yellow powder due to vibration, and signs of partial discharge and overheating;
o) Whether the side pads of the outlet slot have shifted.
Check the tightness and abnormality of the groove wedge. Should check.
a) Check for abnormality, delamination and discoloration of groove wedge;
b) Whether the end groove wedge is displaced or deformed;
c) According to the inspection method provided by the manufacturer, measure the tightness of the slot wedge. For slot wedge loosening ratio or continuous slot wedge loosening
If it exceeds the requirements of the manufacturer, it shall be processed;
d) Inspection of end wedge looseness and damage;
e) Check the consistency of the end slot wedge.
8 Inspection of insulated water pipe and catchment ring
Check the upper and lower coils and the electrical connection joints of the connecting wires for overheating, discoloration, and glue flow.
Check the fixing condition of the catchment ring, whether there is displacement, welding opening, and water leakage.
Check whether the welded water joint on one side of the catchment ring is open welding, whether there are blisters and water leakage.
Check the grounding bolts, nuts and ground connections.
Check the insulation pad of the water inlet flange of the machine base.
Check the corrugated compensator of the water inlet pipe and catchment ring of the unit for leakage.
Whether there is aging, abrasion, buckling, cracking, discoloration, creepage, etc. on the surface of the insulated water pipe.
Check whether the connecting joints at both ends of the insulated water diversion pipe are loose, and whether the clamping plate screws are loose. Mark the relative position of the tightened bolts to facilitate the next inspection
Repair inspection.
Whether the tie rope on the positioning ring of the water diversion pipe is damaged or broken, check whether the tie rope and the insulated water diversion pipe are worn.
During the hydraulic test of the whole machine, check whether there is any leakage in the joint of the insulated water diversion pipe.
Check the insulation resistance of the water mains.
Check the fluidity of the internal cold water.
9 Outlet sleeve and main lead
Check the fixing condition of the main lead and the splint for yellow powder and wear.
Check whether the flexible connection board is broken.
Whether the insulation between the main lead and the connecting flange is loose, cracked or dropped.
Check whether there is water, oil, or foreign matter in the outlet box.
Check for cracks on the insulating surface of the outlet porcelain bushing.
Whether the outlet bushing is overheated, damaged, cracked, glue flowing, discoloration, creepage, etc.
Inspection of outlet casing fasteners and seals.
Check the insulation surface in the outlet box for signs of overheating and glue flow.
Whether there is foreign matter in the vent hole of the hydrogen cooling outlet casing.
10 Inspection of end cover, bearing and sealing shoe system
The inspection items of the end cover, bearing and sealing tile system are as follows.
a) End cover and sealing seat cleaning;
b) Inspection of bearing bush tungsten gold surface and oil bladder;
c) Check the size of the sealing tile;
d) Flaw detection of sealing and bearing bushes;
e) Check the jack shaft oil pipeline;
f) Insulation inspection of end cover and sealing seat insulation;
g) Inspection of end cover deformation;
h) Insulation inspection of bearing seat.
11 Temperature measuring element
Visually inspect the temperature measuring element at the outlet joint of the steam side coil, the embedded condition of the hydrogen temperature measuring element in the machine, whether it is defective, disconnected, lead (including worn
Inside the pipe) should be intact and firmly fixed.
Check the tightness of the terminals.
Measure the insulation resistance and DC resistance (cold value) of the resistance temperature measuring element at the terminal board of the machine base.
Check the temperature measuring components and spare temperature measuring components.
12 Tests in maintenance
The test during the maintenance process should be based on DL/T 1768 and the manufacturer's regulations.
According to the test results, the internal cooling water circulation and insulation performance should be evaluated.
13 Reinstall the generator
The reinstallation process of the generator is as follows.
Reinstall the cooler;
Inspection and cleaning of foreign bodies in the stator bore;
See Appendix D for the typical method of piercing the rotor;
Re-measure the axial and radial position dimensions of the rotor;
Install bearing bushes, sealing bushes, end caps of sealing support, etc., and measure and adjust the installation dimensions to pass;
Shafting docking, measuring outer circle runout, concentricity, opening and docking.
14 Overall air tightness check
For overall air tightness inspection, refer to JB/T 6227 for the method.
During the airtight test, the following parts should be checked.
a) End cover joint surface and fastening bolts;
b) Oil seal assembly;
c) Outlet sleeve assembly;
d) Cooler assembly;
e) External pipelines, flange joints and valves of the generator;
f) Manhole doors and fastening bolts;
g) Machine base weld.
Appendix A
(Informative appendix)
Maintenance items corresponding to all levels of maintenance
The generator stator maintenance items and the corresponding maintenance levels are shown in Table A.1.
Appendix B
(Informative appendix)
A 600MW water-hydrogen hydrogen-cooled generator uses the "double crane-reverse chain slider method" to extract the rotor.
B.1 Suspended shaft, the steps are as follows.
a) Fix the upper hanger on the fixing screw holes of the end cover at the upper end cover on both sides of the steam and excitation, and pad special aluminum plates on the contact surface;
b) Slightly lift the rotor shaft head of the generator field end with a crane, remove the bearing lower bush, and remove the field side frame shaft tool. By spin
Turn the length of the suspension bolts on the hanger to adjust the height of the wire ropes of the two upper hangers. Put down the crane and put the weight of the rotor on
On the wire rope supported by the hanger;
c) Use the same steps as B.1.2 on the steam side to suspend the rotor body;
d) The schematic diagram after lifting is shown in Figure B.1.
Figure B.1 Schematic diagram of suspension shaft
B.2 Lower the end cap, the steps are as follows.
a) Remove the positioning key blocks of the outer and lower end covers on both sides of the generator, and mark the positioning keys;
b) Fix the lower hangers on the fixing screw holes of the end shields on both sides respectively, pad the contact surface with a special aluminum plate, hang two 5t inverted chains, and match 2
A 5t buckle hangs the lower end cover;
c) After removing the stabilizing nails and bolts of the lower outer end cover, adjust the two inverted chains to make the center of the end cover fall at least 500mm and then cushion it. Fallen
During the process, a special skid should be placed between the end cover and the end face, and the end cover and the end face should be adjusted to make good contact. working
Do not knock against the sealing surface;
d) Record the part number and keep it properly;
e) The schematic diagram of dropping the end cap is shown in Figure B.2.
Figure B.2 Schematic diagram of dropping the end cap
B.3 Put the slider and the sliding plate, the steps are as follows.
a) Using two cranes at the same time, hoist the rotor so that the rotor body is close to the air gap partition on the upper part of the stator bore. At this time someone should be assigned
Monitor so that it does not collide with the iron core, air gap diaphragm and guard ring. The hanging position of the steam side hoisting rotor sling should be close to the coupling position;
Rubber sheet (iron core pad)
Rotor slide
Figure B.3 Schematic diagram of rubber sheet and rotor slide
b) The contact surface of the sliding plate, the opposite wheel sliding block and the main sliding block should be wiped with paraffin or butter;
c) Lay a special rubber plate and sliding plate (see Figure B.3) on the lower semi-circular arc surface in the stator bore. Rubber boards and skateboards should be placed upright, not
Bias to either side;
d) Pass the nylon rope from the excitation end to the steam end, connect with the nylon rope of the rubber sheet, and pull the rubber sheet into the air gap under the rotor;
e) Use the same method to pull the sliding plate into the air gap under the rotor. Be careful not to damage the air gap in the stator bore when penetrating into the skateboard
Part such as partition or rotor guard ring;
f) Both ends of the rubber sheet are bound and fixed with nylon ropes, and ...
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