Dry-type transformers and oil-immersed transformers difference

In daily life, the common transformer is tantamount to dry-type transformers and oil-immersed transformers of the points, the two have their own characteristics, and the scope is very different, but both are superior performance, popular. From the literal point of view, dry-type transformers and oil-immersed transformer is the main difference is no "oil", as I do not know, because there is no oil, both in appearance there is a big difference.
Dry-type transformer without oil, do not shell, and can directly see the transformer coil, and 3 phase step up transformer because there is oil, there is a shell, the shell is transformer oil, oil soaked with transformer coil, from the outside Can not see the transformer coil.
Oil-immersed transformer in order to facilitate the heat, that is, to facilitate the flow of internal insulation oil cooling, the external design of the radiator, like a heat sink, and dry-type transformers but not the radiator, cooling transformer coil by the following fan, prefabricated compact transformer as a result of fire needs, generally installed in a separate transformer indoor or outdoor, and dry-type transformers must be installed indoors, under normal circumstances installed in the low-voltage distribution room, and low-voltage Power distribution cabinet installed side by side.
It can be said that the two have their own advantages and disadvantages, each with its own characteristics, no matter what kind of transformer has its scope of application, can be used within its scope to play the greatest value.

Importance of Setting Temperature Control System for Dry Type Transformer

single pole transformer itself, the safe operation is very important, its safe operation and its service life, largely depends on the transformer winding insulation is safe and reliable.
In addition, we must know that the winding temperature on the insulation of great influence, if the winding temperature exceeds the insulation temperature, it is likely to make the insulation is damaged, reducing the use of dry-type transformers, and even lead to its normal work, Therefore, the transformer operating temperature monitoring and alarm control is very important, because the power transformer 10kva structure from the inside to the outside are: core, low voltage winding and high voltage winding. While the heat source for the core and low-voltage winding, the outer surface of the high-voltage windings due to the small current and heat rarely.
Therefore, the use of ordinary axial fan blower transformer surface and air conditioning cooling effect is not good. Transformer in the manufacturing, has reserved a dedicated cooling duct, only a specially designed dry air-cooled temperature control device in order to achieve the desired results.
As the dry-type transformers are often unattended operation, in order to ensure the safety of dry-type transformers, installation of air-cooled temperature control system and the ventilation of the switchgear transformation, so that when the temperature is too high to automatically start the ventilation cooling device is very important.
Therefore, the dry-type transformer set temperature control system is necessary.

Oil-immersed transformer inspection items are as follows:

1, see the 11kv single phase transformer is not a threat to the safety of the transformer running around the hidden dangers;
2, see the gas relay is not full of oil;
3, see the side of the casing is not damaged, there is no discharge traces or other anomalies;
4, check the cooling device operation;
5, check the conventional type transformer running sound is normal;
6, check the connection head and the side of the casing pile with or without heating, discoloration;
7, to see the discoloration of respirator selenium color change has not changed;
8, see the oil pillow and oil filling casing in the oil level, oil color is normal, there is no oil leakage phenomenon;
9, see the annex and the body without leakage, oil leakage phenomenon;
10, check the upper oil temperature table indicates there is no abnormal situation;
11, check the explosion-proof tube diaphragm has no effusion, the appearance is not complete and so on.

Transformer core grounding treatment:

100kva single phase pole mounted transformer core grounding inspection is generally used to detect the steel clamp pieces and iron core insulation, if measured through the screw insulation resistance is zero, you can determine the grounding point, and then from the top down the gradual investigation. But also useful multimeter power measurement, but need to do security measures, and by experienced professionals to operate.
100kva oil transformer assembly and maintenance is the main reason for multi-point grounded core. So in the maintenance must be folded silicon steel sheet, need to be crushed when the insulation can not be crushed between the stack to keep the laminated clean, metal powder can not stay on the disc, the prominent silicon steel hammer to use flat, leak Magnetic processing to be painted, some pads and insulation washer must be replaced when crushed, loose should be fastened. Grounding plate and core to overlap firmly, do not touch other silicon steel. If you find the phenomenon of touch the core, to install the insulation board and fixed. When the bottom of the tank dirt and sludge is completed, the transformer insulation drying, the transformer after the power transformer repair inspection and observation to confirm the sound normal, all components connected well, there is no prominent phenomenon can be loaded into the fuel tank.

single transformer can be divided into three-phase transformers and single phase transformer

oil immersed distribution transformers 1000kVA and above, shall be installed outdoor thermometer type signal, and then the distant signal. 800kVA and above should be installed oil immersed distribution transformer gas relay and pressure protection device, 800kVA transformer oil-immersed according to the following requirements, in consultation with the manufacturer, but also can be equipped with gas relay. Dry-type transformers shall be specified by the manufacturer, the installation of a temperature measuring device, and more generally for the 630kVA transformer installations.
Products classified according to the number of phases to distinguish between single transformer can be divided into three-phase transformers and single phase transformer

. In a three-phase power system, the general application of the three-phase transformer, when the oversized transport conditions and subject to the  three single-phase power system can also be applied consisting of three single-phase transformer transformer group.

Description of Farady power transformer​

Using its consolidated technology and the experience it has accumulated in the construction of oil immersed power transformers, designs, builds, tests, commissions and maintains power transformers with voltages of up to 35 kV and power ratings of up to 4 MVA.Farady 50kva power transformer

 are used wherever it is necessary to connect systems for the generation, transmission, distribution and utilisation of electrical energy, which function at different voltages, in order to transfer large quantities of active and reactive energy between these systems.