If the input of dry-type transformer is an alternating switching power supply its output voltage is directly proportional to the coil turn ratio of the output input solenoid coil. If a rechargeable battery is used， add a circuit in the input power supply circuit to change it into a continuously changing voltage. In that way， the alternating DC current can be obtained at the output end.
1When the operating oil is mixed with different types of new oil or used for oil， in addition to the accurate measurement of the cold filter point of the mixed oil， it is also necessary to carry out high and low temperature test and sludge test， so it can be managed and used in a mixed manner.
yOstrovIn fact，33kV power transformer ground wire is not only a kind of grounding protection. The following describes in detail that ground wire is the general name of grounding system. Ground wire is divided into protective grounding and safety factor grounding device. Among them，UherskibrodTransformer voltageOrderly advance safety factor grounding device can be divided into grounding protection， anti electric shock grounding device and anti electromagnetic wave radiation grounding device. Protective grounding is to use it for loop to make the facilities achieve the grounding wire specified by the function.
Principle of step-up dry-type transformer: the step-up dry-type transformer is a component that correspondingly converts low communication AC voltage， large current flow and small characteristic impedance into high communication AC voltage， small current and large characteristic impedance. When there is an AC circuit in the original coil， the communication AC magnetic flux will be caused in the transformer core (or magnetic core)， causing the magnetic induction voltage in the primary coil (or current).
YBosilovoIn order to better avoid transmission overvoltage damage， a group of overvoltage maintenance high-voltage Arresters (such as ycs active zinc oxide high-voltage arresters) shall be refitted at the working voltage bus duct side of dry-type transformer.
KuOnce the insulation material of electrical equipment is overheated， the surrounding gas will cause a kind of odor. This kind of odor can be sniffed out by normal patrol staff. When you smell such odor during normal inspection， you should carefully inspect the equipment and parts with overtemperature until you find out the cause.
It is understood that in China，33kV power transformer transformers have experienced the whole process of replacing many series products such as S. As early as the middle and late s， S Series lossless distribution transformers were selected in China to replace the high energy consumption transformers of jb- and jb - Specifications operating in the power network at that time. Since the th century urban power grids have been transformed all over the country， and S series distribution transformers have been used to replace S Series. In recent years， S and S commodities are gradually selected in large quantities in the transformation of urban and rural power networks in China， and their full load loss is % - % less than that of S transformer.
Accurately measure the resistance of each phase winding and carry out the measurement. If there is a great difference， it is a common fault of the winding. Then carry out the appearance inspection of the iron core， and then accurately measure the inter chip insulation resistor by AC voltage and galvanometer method. If the damage is not large， paint the damaged part.
lThere 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.
IOvertemperature alarm and trip: collect winding or iron core temperature data signals according to the temperature measurement resistor of PTC discrete system thermistor embedded in the bottom voltage winding. When the transformer winding temperature rises again，33kV power transformer the system software outputs the overtemperature alarm system; If the temperature rises to ℃ again and the transformer can no longer operate， the overtemperature trip data signal must be transported to the secondary maintenance circuit，UherskibrodTransformer voltageOrderly advance and the transformer shall be tripped quickly.
FInstallation worksPower saving analysis of transformers has always been based on whether the utilization rate of transformer capacity is less than a certain standard value. Whether transformers are environmental protection and energy saving specifications. In fact， sometimes such specifications are not saving electromagnetic energy， but consuming electromagnetic energy.
oWThe proper selection of Anhui dry-type transformer has a key effect on improving the safety and smooth operation of power system software. In the above original text， we have already mastered the structure and characteristics of dry-type transformer. In this part， we will describe how to select dry-type transformer according to the load characteristics and application environment of dry-type transformer.
Maintenance contents of power transformer
The grounding resistance of high voltage and bottom voltage shall not be less than % (m & omega;) of the original value. The difference between the three-phase mean value of winding resistance measurement at the same temperature shall not exceed %， which shall not exceed % compared with the last accurate measurement result.
Variable costaTransformer manufacturers said that at this stage， the energy-saving distribution transformer Market in China is relatively scattered， coupled with the constraints of factors such as low threshold in the field，Power transformer price: 1000KVA, 33kV power transformer, 25kV power transformer, power transformer, oil immersed transformer, dry-type transformer factory uneven companies， lack of evaluation and specifications， and inadequate technical innovation， resulting in the slow marketing and promotion of energy-saving transformers.
QHigh voltage fuse of transformer breaks one phase;
sOstrovVisual inspection method for transformer inspection
pEPrecautions for trial operation of power transformer manufacturers
How to select dry-type transformer