Probe short-circuit test generator _837 -

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The problem of short circuit test generator

CT should be checked excitation transformer and generator differential protection of wiring polarity is correct; (3) Check the polarity of the relay and phase current loop, checking wiring and meter measurement of the correctness of instructions,[link widoczny dla zalogowanych], if necessary, to draw vector diagram; (4) into units Water conservation; (5) excitation device in the \secondary flow conditions,[link widoczny dla zalogowanych], check the generator phase of the current loop and three-phase current accuracy and symmetry; (6) power supply electric excitation; (7) in the generator rated current conditions, and the pendulum vibration measurement degrees, check the carbon brush and collector ring work; ( Super

in the generator rated current conditions, jump off the magnetic switch to test whether normal excitation, the recording generator excitation at rated current oscillogram process ; (9) recorded three-phase short-circuit characteristic curve generator, level by level will rise to rated stator current, the stator rated current record every 1O stator current, rotor current and rotor voltage; reducing flow grade measurement should be 10 points or more; (10) Generators are shaft-current protection device, the stator current reaches the rated value, check the shaft current protection device secondary output current; (continued on page 45) 3 Li Pu: Tianshengqiao Power Plant No. 3 generator handle 45 ④ runout exceeding the following stanch the center ring, hung an adjustment of the piano wire rack, stator, on the center rack, adjust the standard 0.05mm. ⑤ to the actual height of the components, the next frame deflection, calculate the adjustment under the frame, the stator, on the rack elevation. Adjusting the standard: the level of elevation of the rotor magnetic pole center and the center of the stator core level elevation 0-1 2.0 Table 2 Sky Power Plant Unit 3 prior to the outage runout record in November 2006 8 Kusakabe rack vibration (mm) ooo Power Plant Unit 3 Tianshengqiao overhauled runout record February 6, 2007 ⑥ adjusted correctly guide and lower guide bearing on the gap, the guide block to adjust the bilateral gap of 0.3mm, under the guide block to adjust the bilateral gap to 0. 4mm; water guide the bilateral gap remains the same, under the guide block of spherical pillars from the original 5Omm replace 8Omm. ⑦ mirror plate back to the installation, we found that the mirror plate exceeded the level of degree: + y direction of the high 0.085mm / m, + X direction of the high 0.075mm / m, treatment options are next put a copper base plate rack pad, adjustment mirror plate level, to ensure that the level of deviation is less than 0.02mm / m. ⑧ rigid plate car, check the correction axis, the rotor center in the body, an additional measurement of lower flange section, check the units and additional moving parts and different degree of cross-section of the twists and turns the heart degrees. Generator rotor and through a comprehensive approach to the whole unit, from Table 2, the vibration unit placed before and after the value of contrast can be seen that the unit has been completely eliminated excessive runout defects. 3 Conclusion of Unit 3 by three runout exceeds the processing can be seen on the generator rotor for the two tests and weight handling,[link widoczny dla zalogowanych], reducing vibration is not particularly evident in the second air gap of rotor and \groove at the Canadian steel pad to adjust the rotor roundness, the unit vibration swing decreased significantly, therefore, Tianyi runout excessive power units were mainly due to crew error when installing the larger rotor and the rotor roundness second air gap unbalanced magnetic pull caused by uneven, the secondary reason is that when installing the unit, under the guide block of gap adjustment is unreasonable, under the guide pillar of strength not spherical, and excessive levels of the mirror plate and so on, which led to severe excessive runout unit. (Continued from page 42) (11) the testing is complete,[link widoczny dla zalogowanych], the generator rated current conditions, jump off the magnetic switch (FMK), recorded under the generator rated current excitation characteristics, recording waveform with an oscilloscope should also be people in the excitation output termination device 50a / 3 ~ 5kw resistive load, in order to eliminate interference. 5 Test organization and security (1) generator during short circuit test, the test should be set up leading group set a commander who, under the water, generators once, generating the second of three groups, and the turbine governor excitation equipment by the equipment manufacturers operating in principle, commissioning officer. (2) Test operation of each step should be to monitor the designated persons, in order to prevent misuse. (3) hand recorded test data. (4) in the testing process, where the abnormal phenomenon, should be immediately reported to the commander, threatening the personal safety equipment and should be immediately shut down. (5) generator short-circuit test is completed, it is necessary for the generator stator and rotor insulation resistance, inspection brush, cleaning collector ring for the next phase of test generators. In short, the generator's short circuit test test organized to do the test scheme is reasonable,[link widoczny dla zalogowanych], strict accordance with procedures to achieve safe, effective and efficient test objectives.

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