电工常见例子（Electrician common example）.doc

电工常见例子（Electrician common example） 1 、 What are the main components of oil immersed transformer? The Z: A5 r$O4 T L) a: the main components of the transformer are: iron core and winding, oil tank, oil pillow, respirator, explosion-proof pipe, radiator, insulation casing, switch, relay, gas thermometer, net oil etc.. H8 T9 X4 \ $e! B% D Z8 Q 2. What is a full insulated transformer? What is a semi insulated transformer? T R0 I. B4% u! @5 o U- s* W) a: nearly neutral part of semi insulating transformer winding is the main insulation, the insulation level than the end winding insulation level is low, but on the contrary, the head end and the tail end of general transformer winding insulation level of the same name the insulation. 2 F2 f/ Q, G5 f 3,}* main transformer in the power system is what? Answer: the power transformer of voltage transformer, transmission to power. When the voltage is raised by a step-up transformer, the line loss can be reduced, and the economy of the power supply can be improved, so as to achieve the purpose of transmitting the power at a long distance. The buck transformer can change the high voltage into the voltage needed by the users, and meet the needs of users. H0 C5 D4 y/ P- + |#} 4, what are the dangers of casing cracks? 6 X% P I3 y6 v% x%), U/ h/ | A: casing crack will cause the insulation strength is reduced, can cause further damage to insulation breakdown, until all. The water in the cracks may also expand the casing when it freezes. Therefore, the crack of the casing is very threatening to the safe operation of the transformer. K0; Z7 P R1 Q9 w] (V9, 5 Z high voltage circuit breaker what role? 4 f/ + F, N/ ~$K, R ~ Z3, W5 y Answer: high voltage circuit breaker can not only load current and load current on and off normal conditions in high voltage circuit, but also in system fault and protection device and automatic device is matched, quickly cut off the fault current, prevent the accident and ensure the safe operation of the syste