Introduced the reason and harm of the false oil position in transformer and provided site correct oil injection method.
介绍变压器产生假油位的原因和危害，提出现场正确注油的方法。
2
Two methods, which are called as a small test-signal injection and the differential transformer, are studied in order to detect the rotor displacement without sensor.
研究了转子位移无传感器检测的两种方法，即小信号注入测试法和差动变压器测试法。
3
Collecting ring is a key part in micro motor. It is widely used in revolution transformer and autosyn. The injection quality of the part relates to the property and life span of motor.