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黑龙江变压器安装前的检查

发布者:黑龙江变压器厂    发布时间:2018-07-24
黑龙江变压器安装前的检查
    1.外观检查
   
    2.吊心检查
    1)黑龙江变压器运到工地安装前一般需进行吊心检查。容量在630kVA及以下,运输过程中无异常情况及对道路平坦的短途运输,运输后无怀疑时才允许不吊心检查(******能参加制造厂器身总装,质量符合要求;运输中进行了监督,知道无剧烈振动、冲撞或严重颠簸等)。
    2)吊心检查应尽可能在室内进行,并应有清洁、干操的环境。如果不得已在室内检查时,皮趁晴天、无风沙时进行,否则应搭篷布以防风沙和雨雪。
    3)吊心检查时,周围空气温度不宜低于0℃,黑龙江变压器器身温度不宜低于周围空气温度。用在黑龙江变压器底部加热时,应将器身温度提高到比周围气温高出10℃左右,也可用真空滤油机来加热,以防检查铁心时受潮。
    4)雨天或雾天进行吊心检查只允许在室内进行,此时室温要求较室外高10℃左右,室内的相对湿度也不应超过75%,且黑龙江变压器运到室内后应停放24h以上后再进行。
    5)器身在空气中停留的时间(接触空气时间自放油开始算起)应不超过下列规定:在空气相对湿度不大于65%的干燥天气不超过l6h;在空气相对湿度不大于75%的潮湿天气不超过12h。(注油时间不包括在内)。
    6)吊心前应准备好各种活动扳手、塞尺、白纱带、黄蜡带、白布、绝缘纸板(或红、青钢纸),无水酒精,以及汽油、垫放铁心的道木或型钢和存放黑龙江变压器油的油桶等。油箱的密封材垫一般采用耐油橡皮条或橡胶皮。橡皮条直径为12-25mm,橡胶皮厚度为6—10mm。衬垫应涂以虫胶漆液。虫胶漆液采用无水酒精(纯度为96%以上)和洁净无杂质的漆片按重量为1:4预先调制而成。
    吊心的起重设备可用电动桥式起重机或“神仙葫芦”。吊心前用干净瓶子对黑龙江变压器取油样.以便进行耐压试验和化学分析。如果不合格,应换合格油或用滤油机进行过滤。
    7)吊心检查步骤:①放油:在拆开油箱箱盖前,为防止储油柜的油漏出,应预先通过放油阀将黑龙江变压器油放至黑龙江变压器箱盖以下;②吊心:为了使铁心吊出和放入油箱时不碰撞油箱,起吊前应将油箱放平,铁心底部能平贴油箱底的垫脚上,将器身缓慢吊出,用干净的道木或型钢垫在油箱结合面上,器身放在其上.③检查器身(本检查项目要指旧黑龙江变压器,新黑龙江变压器可省去一些);用干净白布擦净绕组、铁心、支架和绝缘隔板,检查有无铁屑等金属物附在绕组上。拧紧木质螺栓,如有折断可用硬木或环氧布板制作更换。拧紧各部螺栓。对铁心作如下检查:
    1)清除铁心及油道中的油泥,检查硅钢片是否有过热现象,铁心应无变形.
    2)检查所有螺栓应紧固,并有防松措施;绝缘螺栓应无损坏,防松绑扎完好.
    3)检查铁心铜片是否完好,是否可靠.
    4)检查片接触是否良好,有无缺少和报坏。打开夹件与铁轭片后,铁轭螺杆铁心、铁轭与夹件、螺杆间的绝缘应良好,用2500V兆欧表摇测。其绝缘电阻均应在2Ω以上。如果铁轭采用钢带绑扎时,也同样检查钢带对铁轭的绝缘应良好。铁心应无多点现象。
    对绕组作如下检查:
    1)检查绕组轴向压紧有无松动,夹件与垫块有无松动或变形,可用纸板垫紧。
    2)检查绕组外形是否完整,绝缘有无损伤,绝缘层应完整无缺损,变位现象,表面有无积污,有无移位、松开。
    3)检查绕组绝缘是否老化,相间隔板是否固定牢固,两侧间隔是否大致均匀.各组绕组应排列整齐,间隔均匀,油路无堵塞,油箱底部无杂物和水。
    4)引出线绝缘包扎紧固、无破损、拧弯现象,引出线焊接良好,固定牢靠,其引线夹板应坚固;引出线裸露部分应无毛刺和尖角,焊接应良好;引出线与套管的连接应牢靠,接线正确。
    5)各部分导体之间的距离(间距和爬距)是否符合要求。
    6)摇测绕组的绝缘电阻。
    7)调压分接开关的分接头接触良好、弹力正常。转动位置与指示位置一致.转动灵活,密封良好。
    同时记录发现的问题和处理的结果。检查处理完毕,应当用合格的黑龙江变压器油冲洗(冲洗时为防静电感应,不得触及引出线头.以免触电)。并从箱底油塞或阀门将油放完。器身吊入油箱前,应仔细检查油箱内有否遗留金属和其他杂物,******放回器身。
    8)在农村投运现场由于条件较差.工器具和测试设备较缺乏,故上述全面吊心检查一般应放在专门修试车间进行。而安装现场只作简单吊心检查,目的是对运输后结构有否变动进行复核。
 
Transformer installation inspection before
 
    (1) visual inspection
   
    (2) hanging heart check
    A) transformer transported to the site prior to installation normally takes a hanging heart check. Capacity of 630kVA and less during transport anomalies and flat short-distance transport of road transport after no doubt only allowed hanging heart check (it is best able to participate in the factory body of assembly, quality to meet the requirements; transport supervision, severe vibration, shock or severe turbulence, etc.).
    2) hanging heart check should be in the room, and should be clean, dry environment of operation. If a last resort in the interior examination, the skin to take advantage of sunny, no wind, otherwise it should take the tarp to prevent wind and rain and snow.
    3) hanging heart checks, the ambient air temperature should not below 0 ° C, the body temperature of the transformer should not be lower than the ambient air temperature. Electric furnace transformer heating at the bottom of the body of temperature should be increased to about 10 ℃ higher than the ambient air temperature, can also be used a vacuum oil to heat up when exposed to moisture to prevent check core.
    4) rain or fog hanging heart examination is only allowed in the room, at room temperature requires about 10 ℃ higher than the outdoor and indoor relative humidity should not be more than 75%, and the transformer transported to the interior should be parked for more than 24h after before carried out.
    5) the body of the time to stay in the air (contact with air time since the release of oil begin to run) should not exceed the following requirements: no more than l6h in the air relative humidity less than 65% of the dry weather; in the air relative humidity less than 75% of the wet weather is no more than 12h. (Grease not included).
    6) hanging heart should be ready for a variety of activities wrenches, feeler, white silk belt, yellow wax with a white cloth, insulation board (or red the Qinggang paper), anhydrous alcohol, and gasoline, pad put the core of Daomu steel and transformer oil storage drums. The fuel tank seal material pad commonly used oil-resistant rubber or rubber skin. Rubber diameter 12-25mm, rubber skin thickness 6-10mm. The gasket should be coated with shellac solution. Shellac solution of anhydrous alcohol (purity 96%) and clean and free of impurities, paint flakes of 1:4 by weight, pre-modulation.
    Hanging heart lifting equipment available electric overhead traveling crane or the "fairy gourd. Hanging heart with a clean bottle to take on the transformer oil samples in order to pressure test and chemical analysis. If you fail, should be replaced by qualified oil filter or oil filter.
    7) hanging heart check steps: (1) oil drain: open the tank lid, to prevent oil conservator oil leakage through the drain valve in advance transformer oil put to the transformer cover the following; 2 hanging heart: In order to not collision core hanging out and into the fuel tank, fuel tank, lifting the former should fuel tank level, the core at the bottom of the end of the flat tank pad feet, slow hanging out of the body of the joint surface in the tank, the clean Daomu or steel pad on the body of on. (3) check the body of (the checks mainly refers to the old transformer, new transformer can eliminate); a clean white cloth to wipe winding core, brackets and insulation baffles, to check for iron and other metal objects attached to the winding. Tighten the wooden bolt if broken available hardwood or epoxy fabric panels produced to replace. Tighten the ministries bolts. On the core to make the following checks:
    1) removal of the core and sludge in the oil duct, check whether the silicon steel overheating, core should be no deformation.
    2) Check all bolts should be tightened, and anti-tillage; insulated bolts should be no damage, anti-deregulation tie intact.
    3) Check the core is intact grounding copper grounding reliability.
    4) Check the ground-chip contact is good, whether the lack of and reporting bad. Open ground piece of the folder with the iron yoke, a yoke of iron screw core, a yoke of iron and folders, screw insulation should be a good shake test with 2500V megger. The insulation resistance shall be in 2Ω above. If the iron yoke also check the banding of the strip, strip the insulation of the iron yoke should be good. Core should be no multi-point grounding phenomenon.
    Windings for the following inspections:
    1) Check the winding axial compression with or without loose Clamps pad loose or deformed, can be used cardboard pad tight.
    2) Check the winding shape is complete, the insulation should be complete and without defect, with or without insulation damage, deformation phenomena, whether the surface of the contamination, whether the shift, release.
    3) Check winding insulation is aging, white clapboard whether fixation, both sides of the interval is roughly uniform in each group winding should be neat, evenly spaced, non-clogging oil tank bottom debris and water.
    4) Lead insulation bandage fastening, no damage, the kink phenomenon Lead welding good fixation, its lead plywood should be strong; Lead exposed part should be free of burrs and sharp edges, welding should be good; Lead and casing The connection should be secure, the wiring is correct.
    5) the various parts of the distance between the conductors (spacing and creepage distance) to meet the requirements.
    6) Shake the measuring winding insulation resistance.
    7) regulator tap tap contact, normal elasticity. Rotation position and indicate the location and rotation flexibility, a good seal.
    Records found and processed results. Check processing is completed, it should be qualified transformer oil rinse (rinse, anti-static induction, and not touch the the pinout head. To avoid electric shock). And oil discharged from the bottom drain plug or valve. The body of the crane into the tank, should be carefully examined whether the legacy of metal and other debris, and finally back into the body of the fuel tank.
    8) due to poor conditions in the rural areas and put into operation the scene. Industrial equipment and test equipment lacking, so the full hanging heart check should generally be placed on specialized repair test. The installation site is only for the simple hanging heart check whether the changes for review after transportation structure.

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