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.
The capacity and working voltage are different. The dry-type transformer is generally suitable for distribution equipment. The capacity is generally below kVA and the working voltage is below KV， which also ensures the rated voltage of kV; Oil immersed transformers are generally suitable for distribution equipment.
Ralmani hatIn fact， apart from the application of the Finance Bureau， the industry has been trying to formulate and upgrade transformer commodities according to the specifications， so as to promote the improvement of energy consumption level of transformer commodities.
When the transformer is out of phase， there is still no sound when the second phase is sent， and there is sound when the third phase is sent; If the third phase is blocked， the sound will not change， as in the case of the second phase. There are three reasons for phase deficiency:
NavThe noise of dry-type transformer is mainly the vibration noise in operation. This vibration noise is caused by multiple positions， including the vibration of magnetic induction electromagnetic coil. All pay great attention to the solution of vibration when carrying out noise control.
The hanging core of dry-type transformer is a vital part
Before no-load impulse closing，Ralmani hatInstallation requirements for indoor oil immersed transformer， the transformer shall be placed for h and the rising seat and waterproof sleeve installed with vent plug shall be deflated on time.
After the test， connect the data signal contact of the automobile relay with the alarm circuit， the pull-in contact with the opening circuit， and adjust the overcurrent protection value.
What is the cause of power transformer core failure?
After the test， connect the data signal contact of the automobile relay with the alarm circuit，Ralmani hatInrush current of dry-type transformer， and adjust the overcurrent protection value.
Quality improvementThe vibration reduction of collecting and townhouse solves the soft connection of collecting and townhouse. For the copper bar of the low-voltage bus of the equipment， the electromagnetic induced noise oscillation may be transmitted from the townhouse to the building structure. The core of noise reduction solution must be changed to copper wire connection.
Oil immersed transformer
The insulating layer in the middle of the silicon steel plate is aging， the anchor bolt cover with the iron core is damaged， the iron core causes large vortex， resulting in heat， temperature rise， and the aging of the insulating layer is accelerated. The core insulation compressive strength of power transformer must be measured on time and accurately. If it is found that the insulation compressive strength is less than the index value， please remove and replace the anchor bolt cover or carry out insulation for the copper core cable.
When sampling from a small and medium-sized power transformer without a discharge pipe (or oil sample suspension plate)， it can be in a power transformer such as a glass test tube when it is not in operation to extract the oil sample at the bottom， or it can be replaced by changing the oil.
Range(I) the distance between the external contour of kV and below dry-type transformer and the surrounding guardrail or courtyard wall shall take into account the convenience of transportation and repair of dry-type transformer， and the distance shall not be less than m; At the angle with actual operation，Ralmani hatOil change steps of oil immersed transformer， a spacing of more than m shall be reserved; If metal fence is selected， the metal fence shall be grounded and a warning sign shall be hung at a prominent position.
The transformer manufacturer said that the selection should be based on the application environment of the dry-type transformer. For the extremely extreme environment， the dry-type transformer should be poured with epoxy resin glue. Because this kind of environment does not need to heat the dry-type transformer， it can operate immediately. However， for the general application environment， the class H dry-type transformer can be used.
After tightening the loose bolts， seal the flange， and solve the bolts that are likely to leak， so as to achieve the goal of complete treatment. Tighten the loose bolts strictly according to the actual operation and processing technology.
Ralmani hatOil leakage at electric welding position
(I) the distance between the external contour of kV and below dry-type transformer and the surrounding guardrail or courtyard wall shall take into account the convenience of transportation and repair of dry-type transformer， the metal fence shall be grounded and a warning sign shall be hung at a prominent position.
The zero line is mainly used in the working circuit. The voltage caused by the zero line is equivalent to the line resistance multiplied by the current of the working circuit. Because of the distance a spacing of more than m shall be reserved; If metal fence is selected， the voltage caused by the zero line can not be ignored. As a countermeasure to maintain life safety， it is more and more unreliable. Ground wire (PE): it is not used as a working circuit but only as a maintenance line. Use the affirmation of the earth & ldquo; ” Voltage. When the machine and equipment casing is electrified， the current will be quickly grounded. Even if there is a lead for the PE line， it will be grounded from the surrounding grounding body.