When checking the hook core， the insulation of the electromagnetic coil and the porcelain sleeve is usually accidentally damaged. After the shell of the pottery is broken， if you work again， turn on the photo flash when it"s light， and it"s short when it"s heavy. Therefore， please pay attention during maintenance. It is not necessary to destroy the insulation. After maintenance， experts can inspect special tools， parts， insulation， etc. and deliver them after they are determined to be complete and reliable.
AkabadiThe top and middle of the transformer oil tank， the flange plate， resulting in insulation damage.
Common problems of tap changer of power transformer
Chebok sareIn terms of the place of use， dry-type transformers are mostly used in & ldquo; Fireproof and explosion-proof type & rdquo; It is easy to use in large and medium-sized engineering buildings and multi-storey buildings; The oil immersed transformer because of & ldquo; Accident & rdquo; There is likely to be oil or leakage after fire， and most application places leading to fire accidents are easy to choose in large and medium-sized engineering buildings and multi-storey buildings;
When the whole process of winding wave of oil immersed transformer is calculated by using the marking method， and each module is replaced by an equivalent circuit and its power circuit includes an inductance and vertical capacitance， a capacitance to ground or capacitance between windings， They also have mutual inductors between the inductors of each module， and collect the chain Internet as the equivalent power circuit of oil immersed transformer. The precision of the conclusion can completely meet the needs of practical projects.
There are many connection groups of dry-type transformers， and the selected structures and connections are also different. Then， what are the groups of dry-type transformers? How to carry out the connection? Or basically introduce it with the network of dry-type transformer manufacturers.
What about oil immersed transformer fire?
The visual inspection method is that the staff use human eyes to observe the appearance change of the visible parts of the operating equipment to find the abnormal conditions of the equipment， such as discoloration， deformation， offset， cracking， loosening， ignition smoke， oil leakage， broken strand disconnection， short-circuit fault marks， hanging of dirty things， etching and turbidity， which can be inspected according to the visual inspection method. Therefore， visual inspection is one of the common methods of equipment inspection.
() the installation position of secondary commercial insurance of transformer on column and ground shall meet the following requirements: if there is an disconnector on the secondary side， it shall be installed between the disconnector and low-voltage composite insulator， or the circuit breaker shall be selected as the disconnector; If there is no disconnector on the secondary side， it shall be installed on both sides of the low-voltage composite insulator， and the insulated cable jumper shall be connected to the insulated cable on both sides of the circuit breaker.
manufacturer(IV) the transformer on the column shall be stable and firm， and the waist rail shall be & phi; mm galvanized wire shall be wound over turns in an even number. The iron wire shall not have a connector and shall be tightened after winding. The distance between the waist rail and the energized part shall not be less than .m.
The main reason is that the welding quality of electric welding is poor， there are empty welding， open welding， needle holes， sand holes and other shortcomings in welding. The oil transformer is easy to be covered with welding powder and paint when leaving the factory，Akabadi315 oil immersed transformer， and the potential safety hazards are exposed after operation. In addition， the electromagnetic induction vibration will crack the electric welding and lead to leakage.
The project cost is different. Compared with the purchase price of capacity transformer，Akabadi1250KW dry type transformer， the purchase price of dry-type transformer is much higher than that of oil immersed transformer.
The power transformer belongs to relatively durable electrical equipment， and we can"t neglect it in daily application. The common problems of power transformer conductor， power transformer winding and power transformer tapping power switch are analyzed below:
Honesty and mutual benefitDry type transformer
The selection shall be carried out according to the load characteristics of power. There are many types of power loads. Different dry-type transformers shall be used for different power loads. If the standard impulse level of power load is less than kV， class H dry-type transformers shall be used. If the standard impulse level of power load exceeds kV， epoxy resin adhesive shall be used to pour dry-type transformers.
If the power transformer stops running for more than h (if the allowable time should be reduced when the ambient humidity is & amp; gt; %)， it should be insulated before putting into use and accurately measured with a V grounding megger. The insulation resistance from the primary side to the secondary side and the ground should be ^ mfl， the insulation resistance from the secondary side to the ground should be ^ mh， and the insulation resistance from the iron core to the ground should be & amp; gt; mfl (note that the grounding device piece should be removed).
AkabadiThe clock expression is used to indicate the phase difference correlation of the working voltage of the secondary side line. The phasor of the working voltage of the primary side line is used as the minute hand the fixed finger is at o"clock， and the phasor of the phase voltage of the secondary side is used as the second hand.
(II) the height width ratio of dry-type transformer pier installed on the ground is generally .m， and a guardrail of no less than m shall be installed around it， and a warning sign shall be hung at a prominent position.
Plug in the power with full load first， observe and detect that the input and output voltage meets the regulations. At the same time， check whether the equipment has abnormal sound， ignition odor and other abnormal conditions. If there is any abnormality