Caused by sand holes and cracks. For crack leakage， drilling stop hole is a good way to remove in-situ stress and prevent widening.
Power transformers are also used for testing， which are called test power transformers. They can be divided into inflatable， dry test and other test power transformers. They are the basic test equipment for communication AC compression test for many consumers such as power stations， power supply bureaus and scientific research institutions. According to the specifications of the Bureau of quality supervision， It is used to carry out insulation compressive strength test under required current for various electrical products， electrical components and insulating raw materials.
ComanoAutomatic system of centrifugal fan: measure the temperature data signal according to the PT thermistor temperature measuring resistor of the embedded parts at the hot part of the bottom pressure winding. The transformer load expands and the operating temperature increases. When the winding temperature reaches ℃， the system software automatically starts the centrifugal fan for refrigeration; When the winding temperature is as low as ℃， the system software will automatically terminate the centrifugal fan.
On load commissioning:
ValmiOil immersed transformer
It is generally made due to unreasonable installation or ineffective sealing. Polymer composite materials can bond metal materials，Comano1250KW dry type transformer， porcelain laminated glass and other materials very well， so as to achieve the pressure management of oil leakage.
Avoid the load operation of power transformer: if the load operation is long-term， it will lead to the scalding of solenoid coil， slow aging of insulation， short circuit fault between boxes， two-color short circuit fault or short circuit to ground fault and dissolution of oil.
Power transformer factory
At rated power， the ratio of output power to input power of transformer is called the efficiency of transformer， i.e. & ETA; Is the efficiency of the transformer; P is the input power and P is the output power.
The dry-type transformer is composed of two winding resistances， Y & rdquo;， & ldquo; D Y & rdquo;，ComanoTransformer power， & ldquo; y， D & rdquo; and & ldquo; D， D & rdquo;. In China， only & ldquo; y， Y & rdquo; and & ldquo; y， D & rdquo; are selected. Because there are also two types of Y-connection with neutral line and without neutral line. If there is no neutral line， it will not be upgraded. All marks show that with neutral line， it will not be upgraded The letter N after the English letter Y indicates that the neutral line has transformer grounding wire. Yn wiring group， when UAB and UAB overlap， the minute hand points to . & ldquo; & rdquo; in the new wiring group， it is indicated by & ldquo; & rdquo.
Quality improvementWhen we apply oil immersed transformer， we all know that it works with the help of oil. What if the oil immersed transformer is on fire? What countermeasures should we do?
The dry-type transformer is composed of two winding resistances resulting in four wiring groups: & ldquo; y， Y & rdquo;， & ldquo; D， Y & rdquo; & ldquo; y， D & rdquo; and & ldquo; D， D & rdquo;. In China， only & ldquo; y， Y & rdquo; and & ldquo; y，ComanoDistribution transformer wholesale， D & rdquo; are selected. Because there are also two types of Y-connection with neutral line and without neutral line. If there is no neutral line， it will not be upgraded. All marks show that with neutral line， it will not be upgraded The letter N after the English letter Y indicates that the neutral line has transformer grounding wire. Yn wiring group， it is indicated by & ldquo; & rdquo.
Avoid aging and damage of power transformer iron core insulation: aging of iron core insulation or damage of waterproof sleeve holding anchor bolt will cause large vortex of iron core， and long-term scalding of iron core will lead to insulation aging.
Under normal conditions， the actual operation of the oil immersed transformer shall be undertaken by the on-site operation and maintenance management staff. Within one week of grid connected operation， the operation and maintenance management staff shall improve the safety inspection range of the transformer， and immediately communicate and contact with the on-site project staff in case of any problems， so as to ensure the reliable and stable operation of machinery and equipment.
Production departmentWhen we apply oil immersed transformer， we all know that it works with the help of oil. What if the oil immersed transformer is on fire? What countermeasures should we do?
How to select dry-type transformer
Some are tied with plastic tape， and some immediately press the two edges together， because the socket can not be pressed firmly during installation， and there is still oil leakage without sealing effect.
ComanoThe 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.
The insulation distance between the winding and the iron yoke of power transformer is much larger than that between the windings， because the electric field between the winding and the iron yoke is far away and not as symmetrical as that between the windings. In the electric field in the middle of the winding， most of the cables are in phase with the insulating cylinder (plate) in the middle of the winding， that is， the disconnection component of the electric field is small.
Loose core screw
