JB/T 6227-1992 Hydrogen-cooled motor sealing test method and evaluation
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Test method and evaluation of the sealing of hydrogen-cooled motors 1 Subject content and scope of application
JB/T6227-92
This standard specifies the test method and grade evaluation of the sealing of hydrogen-cooled motors during production, installation and handover, overhaul acceptance and normal operation.
This standard applies to hydrogen-cooled motors (generators, phase regulators); it also applies to parts on hydrogen-cooled motors, as well as hydrogen, oil, and water system pipelines and devices connected to pipelines.
Referenced standards
JB/T6517 Technical conditions for oxygen, oil, and water control systems 3 Terminology
3.1 Air leakage volume △VA
When the motor is filled with air, the amount of air leaked out every day and night is converted to the volume at a given state (P., 6.), m*/24h. 3.2 Hydrogen leakage volume △V
When the motor is filled with hydrogen, the amount of hydrogen leaked out every day and night is converted to the volume at a given state (P., §.), m\/24h. 3.3 Gas leakage volume △V
When strict distinction is not required or cannot be distinguished, the general term for the amount of air leakage and hydrogen leakage of the motor every day and night, m/24h. 4 Test instruments
Inclined differential pressure gauge (U-type mercury column differential pressure gauge or precision pressure gauge can also be used); thermometer (minimum division value 0.5C);
Physical pressure gauge;
Min detector:
Other instruments (such as patrol detector, hydrogen detector) and equipment (such as dryer) are essential for power plants or attached to motors (see Appendix Ae.
).
5 Inspection methods
5.1 Inspection items
5.1.1 Motor body: stator, rotor, outlet porcelain bushing, temperature measuring element terminal board, hydrogen cooler, outlet cover, cooler cover, end cover, machine base.
5.1.2 Hydrogen, oil, and water control systems See the industry standard "Technical conditions for hydrogen, oil, and water control systems". 5.1.3 Pipelines: All hydrogen system and motor connection pipelines, hydrogen side oil return and hydrogen return pipelines from the motor to the sealed oil tank, and oxygen pressure sampling pipelines from the pressure difference to the motor
5.1.4 Complete motor system.
5.2 Inspection requirements
Approved by the Ministry of Machinery and Electronics Industry on June 16, 1992 and implemented on January 1, 1993
JB/T6227-92
5.2.1 The sealing structure and materials used during inspection should be consistent with the actual product. 5.2.2 Compressed air must pass through the oil-water separator, dryer and filter before entering the motor (stator, rotor). 5.2.3 The air inlet valve should be closed during the test. To ensure that there is no possibility of gas replenishment in the motor, the gas source can be removed if necessary. 5.2.4 The test should be started and ended at a time when the ambient temperature changes little. During the test, the motor should not be locally heated or cooled, such as direct sunlight, open flame operation, wind, etc. 5.2.5 When filling fluorine or hydrogen, relevant safety matters must be observed. 5.3 Inspection method
5.3.1 Rough inspection: Use soap solution or detergent solution or penetrant Bx solution (concentration 30%). However, for parts and parts with strict requirements on insulation resistance values, such as rotor conductive screw holes, it is prohibited to use the above liquids for leak detection, and it is allowed to use anhydrous alcohol for leak detection. 5.3.2 Fine inspection: Use a halogen detector when filling ammonia; use a hydrogen detector when filling hydrogen. The amount of Freon is calculated based on the gas filling volume of the equipment under test of 35 to 70 g/m. 5.4 Stator body sealing test
5.4.1 See Figure B1 in Appendix B for the schematic diagram of pipeline connection during the test. 5.4.2 The outlet porcelain bushing, temperature measuring element terminal plate, hydrogen cooler, outlet cover, cooler cover, end cover, machine base, etc. must be individually sealed and qualified before they can be installed on the motor stator. When installing in a power plant, the transition lead must be installed, and the sealing test can be carried out after the overall water pressure and air tightness test of the stator internal water direct cooling system are qualified. 5.4.3 Except for the flange ports of the stator internal water direct cooling system (inlet, outlet, air exhaust, sewage exhaust) and the hydrogen cooler (inlet, outlet, air exhaust), the remaining flange ports on the stator machine base must be blocked. 5.4.4 Inspection procedure: filling the motor with gas, leak detection (rough inspection, fine inspection), stabilization, reading, calculation, curve drawing, judgment, stop test, deflate, end.
5.4.4.1 After the gas pressure filled into the motor reaches the test requirement, it must be stable for 2 hours before reading can be started, and recorded in Table C1 in Appendix C, and recorded every 1 hour thereafter.
5.4.4.2 When using a U-shaped end-column differential pressure gauge to multiply the cylinder surface with concave and convex, the reading is based on the top line of the convex surface or the bottom line of the concave surface. 5.4.4.3 The average temperature of the gas in the motor (9, 9,) should be based on the average value of the readings of the thermometers at the steam and excitation ends, the middle base, and the resistance thermometers (with patrol detectors) in the hot and cold air zones. 5.4.4.4 Test time - generally not less than 24 hours. After the test is carried out for 12 hours (4 hours for inclined differential pressure gauge), the formula (A1) or (A2) in Appendix A can be used for calculation and a △V = (△) curve can be drawn. If the error between three consecutive points of leakage does not exceed 15%, it can be considered that the gas leakage has stabilized and the test can be ended. Otherwise, the test time should be extended. 5.4.4.5 When it is found that the calculated leakage fluctuates greatly, the following reasons can be found and eliminated: a.
The accuracy of the measuring instrument is not enough, and the reading error is large; the actual value of the average temperature of the gas in the machine deviates greatly from the measured value; the ambient temperature changes greatly;
The L+2 value deviation of the U-type mercury column differential pressure gauge is large:
The oil level in the sealing oil tank fluctuates greatly.
5.5 Inspection of the sealing performance of the entire motor system
5.5.1 During the inspection, the pipeline connection must conform to the actual situation when the motor is operating normally. 5.5.2 When the sealing oil control system is put into operation, the difference between the air side oil pressure and the air pressure inside the machine must meet the normal operation requirements, and the hydrogen side oil pressure and the air side oil pressure must be balanced. The oil level height of the sealing oil tank must be kept the same when each reading is recorded. 5.5.3 The working status of the valves and instruments on the oxygen and water control system should be completely consistent with the actual status when the motor is in normal operation. It is strictly forbidden to intentionally close certain valves and instruments to reduce the amount of leakage. 5.5.4 The water direct cooling system and hydrogen cooler in the motor are not allowed to be filled with water, and the air exhaust valve must be opened. 5.5.5 The inspection procedure is the same as Article 5.4.4.
5.6 Inspection of the amount of hydrogen leakage of the motor
JB/T6227-92
5.6.1 The motor must be in the hydrogen filling state, and the hydrogen pressure and speed should be maintained at the rated value. 5.6.2 Other parameters of the motor (such as load, power factor, etc.) are not limited, but once the hydrogen leakage test is started, the motor load, the amount of water in the hydrogen cooler, etc. should be kept constant as much as possible to maintain the minimum change in the hydrogen temperature in the motor. 5.6.3 The test instrument uses a precision pressure gauge. If necessary, a U-shaped mercury column differential pressure gauge can also be used, but an inclined differential pressure gauge is prohibited. 5.6.4 When the test time is very long, such as more than 48 hours, the hydrogen leakage can be calculated using the simplified formula (A3) in Appendix A. 5.6.5 Test procedure: The test can be started, stabilized, read, recorded, calculated, drawn, judged, stopped, and the motor continues to operate normally under any normal operating state of the motor.
Grade Assessment
The maximum allowable hydrogen leakage △V per day and night for the entire motor system at the rated hydrogen pressure and speed of the motor is shown in Table 1. Table 1
Rated hydrogen hydride
Assessment level
m=/24h
When the rotor of the whole motor system is stationary (including turning), the maximum allowable air leakage volume AV per day and night is shown in Table 2. Table 2
Assessment level
The maximum allowable air leakage volume △V of the stator body per night is shown in Table 3. 6.3
Assessment level
Parts The maximum allowable pressure drop of components and pipelines is shown in Table 4. 0.3
m2/24h
m*/24h
Outlet porcelain bushing
Temperature measuring element terminal plate
Hydrogen cooler
Machine base plus cooler cover
Outlet cover
JB/T6227--92
Test force
P% + P
Test time
Manufacturing
(P+P,)X8%
Installation handover or overhaul acceptance
(P 1 Pa)×10%
(P%+P,)×0.08%
(P 1 P。)X0.2%
Motor filling volume, m;
Motor rated hydrogen pressure.MPa;
JB/T6227-92
Calculation formula for hydrogen-cooled motor sealing test (supplement)
Atmospheric absolute pressure under given conditions, P。=0.1MPa; Atmospheric absolute temperature under given conditions.9%=273+20=293K; Gas pressure at the start of the test, MPa; Absolute atmospheric pressure at the start of the test, MPa; Average temperature of gas at the start of the test, C; Gas pressure at the end of the test, MPa; Absolute atmospheric pressure at the end of the test, MPa; Average temperature of gas at the end of the test, C; Pressure drop of inclined differential pressure gauge from the start to the end of the test, Pa; Time of the test, h;
Leakage when the gas pressure at the start of the test is P, m*/24h; Leakage when the gas pressure at the start of the test is P, m\/24h; When the gas pressure at the start of the test (P) is different from the rated hydrogen pressure (P%), the coefficient for converting the test leakage (△V,) to the leakage under the rated hydrogen pressure (△V); When the hydrogen purity is 98%. Conversion coefficient between hydrogen leakage (△V) and air leakage (△VA). A2 Calculation formula
Using inclined differential pressure timing, calculate according to formula (A1): V.AP
AV=0.00024
When using U-shaped mercury column differential pressure gauge and precision pressure gauge, calculate according to formula (A2): P,+B,
273+6,
3 Simplified calculation of motor oxygen leakage is calculated according to formula (A3): A2.3
AVH=V(
4 Conversion factor K, calculated according to formula (A4): A2.4
A2.5 Conversion factor K, calculated according to formula (A5) Calculation, K.
Note: The approximate equivalent hydrogen leakage volume △VH obtained by multiplying the air leakage volume △VA by the coefficient K: cannot be used as grade assessment data, but can only be used as estimated data 297
and do not continue to read
JB/T6227-92
Appendix B
Schematic diagram of pipeline connection during stator body sealing inspection (reference part)
Schematic diagram of pipeline connection during stator body sealing inspection is shown in Figure B1. Figure B1
1-Thermometer;
4-Measurement of atmospheric temperature Gauge:
7-precision pressure gauge;
10-dryer;
2-same detector:
5-atmospheric pressure gauge;
8-inclined differential pressure gauge;
11-oil-water separator;
13-high-pressure stop valve (or rubber-lined valve)
3-resistance thermometer in the wind zone:
6-U-type mercury column differential pressure gauge;
9-chloroleon bottle;
12-ordinary stop valve;
See Table C1 for the sealing inspection record. ||t t||Test time
Additional instructions:
Gas inside the motor
JB/T6227-92
Appendix C
Sealing test record
(reference)
Steam endIntermediate excitation endCold air zoneHot air zone
This standard was proposed and managed by Harbin Large Motor Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Harbin Motor Factory. The main drafter of this standard was Wu Huiting. bzxz.net
Oil level in the sealing oil tank
Calculate the leakage
m*/24h
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.