EGCP-2  8406-121
•使用的垫圈材料为合成橡胶粘结软木（SRBC）板或丁腈橡胶
橡胶SRBC材料符合IS:4253（第二部分）的RC-70C；使用的厚度为6.0 mm
10.0毫米。垫圈应在无应力条件下储存，并且必须防潮，
机油和润滑脂。
•合成橡胶粘合软木板一旦使用，不得再次使用。垫圈座面
应光滑，无划痕、油、油脂、污垢等。
•拧紧前，垫圈应正确定位。垫片接头设计为40～50%
压缩。
•垫圈接头应按完全相反的顺序均匀拧紧。
•过度拧紧会导致垫片材料性能松动，而拧紧不足可能不会
防止漏油。
TBI AF/IMS001/R3变压器安装、调试、运行和维护
54 | P a g e
4.14真空下检查泄漏率
•排空油箱内的油并产生200托的真空，关闭真空泵和
油箱，停止泵并保持真空。应无明显的真空损失
一分钟。
•如果有泄漏，找出泄漏并进行纠正。
•启动泵，打开阀门并继续，直到达到10托的真空。关闭真空
关闭阀门并停止泵。压力增加不应超过一半1托
一个小时。
•如果压力上升更大，则找出泄漏并进行纠正。
•如果结果令人满意，重新启动真空泵，打开阀门并继续泵送，以获得
1托或更高的真空度，并将此真空保持24小时以上。之前和期间
后续注油操作。
4.15铁芯和框架至油箱的绝缘
•如果内部车身接地线通过低压套管引出，则高阻表值
应使用2 kV兆欧表测量，并记录数值。

• Gasket materials used are either Synthetic Rubber Bonded Cork (SRBC) sheet or nitrile rubber.SRBC material conforms to RC-70C of IS : 4253(Part II); thickness used are 6.0 mm and 10.0 mm. Gaskets should be stored in stress free condition and must be protected from moisture, oil and grease. • Synthetic rubber bonded cork sheets once used should not be used again. Gasket seating surfaces should be smooth and free from scratches, oil, grease, dirt etc. • Gasket should be properly located before tightening. Gasket joints are designed with 40~50% compression. • Gasket joints should be tightened evenly with a diametrically opposite sequence. • Over tightening will cause the gasket material to loose its properties and under tightening maynot prevent oil leakage. TBI AF/IMS001/R3 Installation, Commissioning, Operation & Maintenance of Transformer 54 | P a g e 4.14 CHECKING LEAK RATE UNDER VACUUM • Drain oil & create vacuum of 200 torr inside the tank, close the valve between vacuum pump and tank and stop the pump and hold the vacuum. There should be no appreciable loss of vacuum over one minute. • If there is leak, find out the leak and rectify. • Start the pump and open the valves and continue till a vacuum of 10 torr is achieved. Close vacuums valve and stop the pump. There should not be an increase of pressure of more than 1 torr over half an hour. • If the rise in pressure is more, find out leak and rectify. • If results are satisfactory, restart the vacuum pump open the valves and continue pumping to obtain a vacuum of 1 torr or better and maintain this vacuum for more than 24 hrs. before and during subsequent oil filling operations. 4.15 INSULATION OF CORE AND FRAME TO TANK • If the internal body earthing lead is brought out through low voltage bushings, the megger values shall be measured using 2 kV megger and the values recorded.