Oil-immersed power transformer low-voltage windings in addition to small capacity of copper wire, generally use copper foil winding cylinder structure, high-voltage windings use multi-layer cylinder structure, make the winding ampere-turns distribution balance, small magnetic leakage, high mechanical strength, strong short-circuit resistance and other characteristics. The following billion electric tells you the basic composition of oil-immersed power transformer.
1. Iron core section -- including the column, yoke and clamping device made of silicon steel sheet;
2. Winding part - including each phase winding and its lead wire;
3. Insulation part -- including oil and paper insulation between each part and itself;
4. Part of the mailbox -- in addition to the mailbox itself, it also includes oil storage tank, bracket, etc.;
5. Cooling system -- including cooler or radiator, oil pump, fan, coupling, etc.
6. Measuring instruments - including signal thermometer, current transformer, oil level meter, etc.;
7. Protection device - pressure release device, gas relay, moisture absorber, etc.
A - transformer core
The main contents of transformer core are cutting, stacking, fixing and the latest stacking technology for reducing no-load loss.
According to the relative positions of windings and cores, cores can be divided into two categories: core and shell. For single-phase transformer, there are two column two yoke, single column four yoke, double column four yoke and so on. For three-phase transformer, the iron core has two columns and two yokes (three - phase three - column), three - column four yokes (three - phase five - column) and other structural forms. The choice of core structure is based on various winding layout, material saving and transportation height. The bypass yoke can reduce the fifth and seventh harmonics of leakage flux and excitation current.
B - transformer winding
Transformer winding part of the main content of the transformer winding wire and winding mode.
Winding wire according to the conductor material can be divided into copper, aluminum two kinds, according to the conductor shape can be divided into circular wire, flat wire, according to the insulation material can be divided into paper, paint, glass wire, etc., power transformers usually use paper wrapped flat copper wire. Windings are usually divided into layer and pie forms. Winding turns along the axis of the sequential arrangement of continuous winding, known as layer winding, each layer is like a tube, composed of two layers of winding called double cylinder winding, composed of multi-layer said multi-layer cylinder winding. Winding turns along the radial continuous winding into a pie (segment), and then by many cakes along the axis of the winding is called the pie winding. Including continuous, tangled and inserted capacitor winding.
Common winding has cylinder, spiral, continuous and tangled four kinds. The cylinder winding is the simplest type. It is usually made by winding one or several links. When winding, one turn along the mold axis is tightly wound, similar to a circular tightly wound coil spring. It is characterized by simple winding, good technology, good heat dissipation in oil passage between layers, but small end support surface and poor mechanical strength.
C - transformer tank
Transformer tank part of the main content of the transformer tank types.
The transformer tank is a container for holding the body and transformer oil. Its main functions are: oil storage, heat dissipation, protection insulation: isolation insulation and atmosphere, avoid the absorption of water and gas, prevent oil aging, dry insulation: the site at room temperature vacuum pump "vacuum tank" role, base, transport.
There are two basic forms of transformer tank: barrel tank and bell jar tank.
The barrel type oil tank is composed of two parts: the lid and the barrel body. Its advantage is simple appearance, only need to put a little oil when lifting the body; The disadvantage is that for the large capacity transformer, the field maintenance needs the crane with large enough lifting weight. Bell jar fuel tank is composed of upper fuel tank and lower fuel tank. Its advantages and disadvantages are opposite to the barrel tank.
D - transformer bod
The main content of transformer body is the fastening technology of transformer core and winding.
Coil amplitude fastening is a means of holding the coil to the core and the coil to the coil in a concentric position. In addition, the inner coil is subjected to pressure when it is subjected to electromagnetic mechanical force of amplitude short circuit, and needs firm fulcrum, so the amplitude fastening of the inner coil of large-capacity transformer is very important. The reliability of transformer manufacturing quality depends largely on the axial fastening of coil, which can resist the action of short-circuit axial electromagnetic mechanical force and eliminate the loosening of coil.
E - transformer lead
Generally, there are three kinds of leads: the lead that connects the end of the coil to the casing, the lead that connects the coils, and the lead that connects the coil to the switch. Power transformer leads have copper bar, paper - wrapped cable, copper pipe and other types. The connections between the leads are phosphor brazing and cold pressing.
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