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DL/T 2011-2019: (Test procedure for on-site replacement of large generator stator windings)
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(Test procedure for on-site replacement of large generator stator windings)
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DL/T 2011-2019
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Basic data | Standard ID | DL/T 2011-2019 (DL/T2011-2019) | | Description (Translated English) | (Test procedure for on-site replacement of large generator stator windings) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K21 | | Word Count Estimation | 17,164 | | 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 2011-2019: (Test procedure for on-site replacement of large generator stator windings)---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.
Test code for field replacement of large generator stator windings
ICS 29.160.20
K 21
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
Field Replacement Treatment of Large Generator Stator Winding
Test procedure
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Preface... II
1 Scope... 3
2 Normative Reference Documents... 3
3 Terms and Definitions... 3
4 General requirements... 4
5 Test items and technical requirements... 4
Appendix A (Informative Appendix) Measurement of Surface Resistance of Generator Stator Bars... 11
Appendix B (informative appendix) AC withstand voltage test of generator stator bar... 12
Appendix C (informative appendix) Generator stator winding slot potential measurement or contact resistance measurement... 13
Appendix D (informative appendix) Check the tightness of the slot wedge of the generator stator bar... 14
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. Guangdong Electric Power Research Institute Energy Technology Co., Ltd., Shanghai Electric Power Station Equipment Co., Ltd. Shanghai Generator Factory,
Dongfang Electric Group Dongfang Electric Co., Ltd., Harbin Electric Plant Co., Ltd., State Grid Hebei Electric Power Co., Ltd. Electric Power Research
Institute, Northeast Branch of Huadian Electric Power Research Institute Co., Ltd., State Grid Shandong Electric Power Research Institute, State Grid Hubei Electric Power
Co., Ltd. Electric Power Research Institute, State Grid Hunan Electric Power Research Institute, Guangdong Datang International Chaozhou Power Generation Co., Ltd.
The company, Chengdu Branch of Guodian Science and Technology Research Institute Co., Ltd., State Grid Shanghai Electric Power Research Institute.
The main drafters of this standard. Zhang Zhengping, Shu Wuqing, Yu Ping, Gong Bin, Zhang Jianzhong, Wang Jianjun, Cao Zhiwei, Ran Wang, Cui Yibo,
Xu Bo, Liao Fanghua, Jiang Jianming, Li Fuxing.
This standard is issued for the first time.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Beijing)
One, 100761).
Field Replacement and Treatment Test Procedures for Large Generator Stator Windings
1 Scope
This standard specifies the test items and technical requirements that should be carried out during the on-site replacement of large generator stator windings.
This standard applies to three-phase hidden pole synchronous generators with a capacity of 50MW and above, other types of generators and synchronous phase modulation
The machine can be implemented with reference to this standard.
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.
GB/T 755 Rotating motor rating and performance
GB/T 1029 Three-phase synchronous motor test method
GB/T 2900.1 Basic terminology for electrical engineering
GB/T 2900.25 Electrical terminology rotating electric machine
GB/T 16927.1 High Voltage Test Technology Part 1.General Definition and Test Requirements
GB/T.20140 The dynamic characteristics and vibration measurement method and evaluation of the stator winding end of the hidden pole synchronous generator
GB/T.20160 Rotating motor insulation resistance test
GB/T 20833.1 Stator winding insulation of rotating electrical machines Part 1.Offline partial discharge measurement
GB/T 20835 Generator stator core magnetization test guide
GB/T 21205 Specification for refurbishment of rotating electrical machines
GB 26860 Electrical Safety Work Rules for Electrical Parts of Power Plants and Substations
GB 50150 Electrical equipment installation engineering electrical equipment handover test standard
DL/T 298 Guidelines for Detection and Evaluation of Corona at the End of Generator Stator Winding
DL/T 492 Generator Epoxy Mica Stator Winding Insulation Appraisal Guidelines
DL/T 596 Preventive test procedures for electrical equipment
DL/T 801 Internal cooling water quality and system technical requirements for large generators
DL/T 1522 Ultrasonic measurement method and evaluation guide for water flow of cooling water system in generator stator winding
DL/T 1524 Generator infrared detection method and evaluation guide
DL/T 1768 Preventive test procedures for rotating electrical machines
JB/T 6204 High voltage AC motor stator coil and winding insulation withstand voltage test specification
JB/T 6228 Inspection method and evaluation of internal water system of turbine generator winding
JB/T 7608 Test method and limit for measuring the tangent of dielectric loss angle of high voltage AC motor coil
3 Terms and definitions
The following terms and definitions as defined in GB/T 2900.1 and GB/T 2900.25 apply to this document.
3.1
Stator bar embedding
The process of embedding and fixing the stator bar in the stator slot of the generator.
3.2
New stator bar
Stator bars that have not been used after leaving the factory, including unused and well-preserved spare bars.
3.3
Reused stator bar
A stator bar that is removed from the generator stator slot and can be reused after treatment.
3.4
Remainder stator bar
The unremoved wire rod in the generator stator slot.
3.5
Full replacement
All the wire rods in the generator stator slot are removed and replaced with new wire rods.
3.6
Partial replacement
Treatment methods other than replacement.
3.7
Stator core corresponding part of stator bar
The stator bar corresponds to the length of the stator core.
3.8
Ending of stator bar
The part of the stator winding that extends beyond the two ends of the stator core.
3.9
Overall heating
The baking process after the stator winding is assembled.
4 General requirements
4.1 During the insulation test, the ambient temperature should not be lower than 5℃, and the relative air humidity should not be higher than 80%. Measure and record at the same time during the test
The temperature of the test product, the temperature and relative humidity of the surrounding air.
4.2 When performing a high voltage test on a single stator bar, the surface of the bar should be covered with aluminum foil, tin foil and other metal materials as electrodes, and minimize
Minimize the air gap between the electrode and the wire rod surface.
4.3 When a single new stator bar is tested by sampling, for the hidden pole generator, the number of samples shall not be less than each set (or each batch)
10% of the total number of stator bars. When the sampling measurement result is unqualified, the sampling test shall be doubled. If it is still unqualified after doubling the sampling test, then
All stator bars shall be tested and inspected.
5 Test items and technical requirements
5.1 During the process of on-site replacement of stator windings, corresponding tests should be carried out in stages according to different cooling methods of the generator.
5.2 The test items for the on-site replacement of all the stator windings of the water-cooled generator are shown in Table 1.
Appendix B
(Informative appendix)
AC withstand voltage test of generator stator bar
B.1 Refer to GB/T 1029 and JB/T 6204 for general test methods and requirements.
B.2 The AC withstand voltage test of the stator bar core section shall meet the following requirements.
a) Carry out before the stator bar is embedded;
b) Wrap metal materials such as tin foil or aluminum foil as the ground electrode within a range of 20mm extension at both ends of the stator bar core section;
c) During the AC withstand voltage test, use an infrared imager to check the temperature rise of the anti-corona layer, and the temperature should not exceed 100°C.
B.3 The AC withstand voltage test at the end of the stator bar shall meet the following requirements.
a) It should be carried out after the anti-corona treatment and before the stator bar is embedded;
b) The end of the stator bar should be covered with tin foil or aluminum foil as the ground electrode;
c) The grounding electrode should be kept at a sufficient distance from the conductor at the nose of the stator bar to prevent the high voltage from the conductor at the nose of the stator bar during the test.
Creepage phenomenon generated from the surface of the bar to the ground electrode.
Appendix C
(Informative appendix)
Generator stator winding slot potential measurement or contact resistance measurement
C.1 Tank potential measurement
The requirements for tank potential measurement are as follows.
a) The slot potential measurement should be carried out after the anti-corona treatment of the stator bar is qualified and before the stator bar is embedded;
b) Before the test, the winding under test should be cleaned and there should be no abnormalities such as bumps or damage on the surface. In addition, it should be measured in advance with a megger
The insulation resistance of the tested bar to ground, and confirm that the insulation status is normal;
c) The stator windings should be sufficiently cooled, the surface temperature of the winding ends (near the core) should not be higher than 50℃, and the ambient humidity should not be higher than 75%;
The temperature measuring components, stator core, and stator housing should be reliably grounded;
d) Short-circuit the tested bar with a wire, and connect the high-voltage lead to it reliably;
e) The tank potential measurement personnel must wear coveralls and shoe covers. After entering the stator bore, they must stand on the insulating pad and perform measurements in the stator bore.
Visual inspection. If abnormal conditions such as unqualified cleanliness are found, the test should be suspended, and the test can be continued after the treatment is qualified;
f) Before the test, various safety measures must be confirmed, and special personnel shall be assigned to guard at both ends of the generator. The test can only be carried out after the test wiring is checked correctly;
g) After applying the test voltage to the rated phase voltage of the power frequency to the tested stator bar, keep the test voltage stable and start the slot potential measurement;
h) Use a multimeter to measure and record the value of the tank potential, measure 10 points for each tank, and the distance between the two ends of the generator steam and excitation tank is 100mm, 300mm
Two points are measured at each position, and the other measuring points are arranged at equal intervals;
i) Since the surface potential of the stator bar will continue to rise outside the slot, it is not possible to approach the end of the stator bar during measurement;
j) After the measurement is completed, the test voltage drops to zero, the power source is opened, the tested wire rod is grounded, and the measurement personnel in the bore are withdrawn;
k) Re-test the insulation resistance of the tested bar to ground with a megger, and its value should be qualified;
l) After the test, the articles in the stator bore should be removed in time to confirm that no foreign matter is left in the stator bore.
C.2 Contact resistance measurement
The requirements for contact resistance measurement are as follows.
a) The measurement of contact resistance refers to the measurement of the resistance between the surface of the stator bar slot and the stator core;
b) The measurement of contact resistance should be carried out after the stator bar and side spacers or side corrugated plates are embedded in the core slot and before knocking the slot wedge;
The contact resistance on the surface of the layer bar should be measured before driving into the slot wedge;
c) The measuring instrument should be an ohmmeter or a multimeter. When measuring, one end of the meter is connected to the iron core, and the other end is connected to the gauge pressed against the stator bar
The electrodes on the surface. In actual measurement, the size of the measuring electrode can be adjusted as required;
d) Generally, sampling is carried out according to 10% of the stator bar, and each slot is measured at equal intervals along the length. For hidden pole generators, every
Slots should be tested at least 10 points, and avoid exceeding the core range; for salient pole generator stator windings, at least 3 points should be tested per slot, and avoid
Avoid exceeding the iron core;
e) The test record should include the surface contact resistance value of the stator bar and its corresponding slot number and stator bar number;
f) The surface contact resistance value of the stator bar should be in the range of [0.2, 30] kΩ, and the individual measured value exceeding this range should not be greater than 50kΩ;
g) If the surface contact resistance of the stator bar is too high, the tightness of the side of the coil should be carefully checked. If the tightness is insufficient, you need to re
Newly plug the side pad or side corrugated board before measuring. If the measured contact resistance value after re-plugging is still high, then
It is necessary to further check whether the low resistance layer on the surface of the stator bar is defective.
Appendix D
(Informative appendix)
Tightness Inspection of Slot Wedge of Generator Stator Bar
D.1 Test method
According to the relevant regulations of the manufacturer and the owner, or according to the following test methods.
a) Groove wedge with corrugated cushion strip. adopt depth test method. Using a special micrometer that has been zero-calibrated in advance, insert the pointer into the measurement on the wedge
Measure the hole, measure the depth dimension of each hole, and calculate the difference between the wave crest and wave trough of the corrugated plate under the groove wedge. When operating, it should be noted
It is intended that the bottom surface of the measuring seat needs to fit smoothly with the groove wedge;
b) Slot wedges without corrugated cushion strips. use the hammering test method to hit the surface of the slot wedge with a small hammer, and judge the slot wedge according to the sound of the slot wedge.
The tightness of the situation.
D.2 Evaluation criteria
The evaluation standards for the tightness of the slot wedge of the generator stator bar are as follows.
a) Groove wedges with corrugated cushion strips. For the newly replaced groove wedges, the difference between the wave crest and the wave trough of the corrugated plate is not more than 0.5mm; for the remaining
The difference between the crest and trough of the slot wedge and corrugated board should not be greater than 0.8mm; but it cannot be zero.
b) Groove wedge without corrugated cushion strip.
1) The sound of percussion is solid and complete, which indicates that the slot wedge is tight, and the sound of percussion is hollow or virtual, which indicates that the slot wedge is loose;
2) The void or virtual sound in the same slot wedge should not be greater than one third of the length of the slot wedge itself;
3) The cavities or virtual sound positions of two adjacent groove wedges should not be continuous;
4) No cavities or false noises should appear in the end groove wedge.
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