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DL/T 1766.2-2019 English PDF

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DL/T 1766.2-2019: (Guide for the inspection of hydro-hydrogen-hydrogenated steam turbine generators - Part 2:)
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
DL/T 1766.2-2019	699	Add to Cart	5 days	(Guide for the inspection of hydro-hydrogen-hydrogenated steam turbine generators - Part 2:)	Valid

Similar standards

GB/T 1029 GB/T 7409.2 GB/T 7409.1 DL/T 1766.7 DL/T 1766.6 DL/T 1766.3

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:)

---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 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

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......

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