Series connection of oil immersed transformer

The connection mode of oil immersed transformer is the same as that of electrical appliances in the circuit, except that it is divided into series connection and parallel connection. Generally speaking, if it is relatively simple, and the power equipment and circuit are relatively single, it is in series connection. The circuit is simple, and the material consumption is also relatively economical. The circuit looks clear at a glance; On the contrary, it is more complicated. Generally speaking, series connection can be divided into two types: one is primary series connection; The other is secondary series connection; Parallel is also divided into two kinds: primary parallel and secondary parallel.

There is a constant n in the calculation formula of oil immersed transformer, which is called turn ratio. It is the ratio of primary turns to secondary turns. The voltage ratio of primary stage is n, while the current ratio of primary stage is 1 / n. For example: for two oil immersed transformers with primary voltage of 220 V and secondary voltage of 18 V, n is 13. If the primary of two oil immersed transformers are connected in series, the output voltage on a single secondary will drop below 9 v. In this case, when the secondary voltage of a single oil immersed transformer is higher than that of multiple electrical appliances, two or more oil immersed transformers can be used in series. And if the two secondary series will not have much use value. In this case, as long as the power requirement of a single oil immersed transformer is guaranteed, the secondary output voltage is not necessarily the same, and its output voltage is calculated as: vsan = (V1 times + V2 times + VN times) / VN.

The secondary series connection of oil immersed transformer is a combination of two or more oil immersed transformers when a single power is satisfied and the secondary output voltage is not satisfied. If the primary input of two oil immersed transformers is 220 V and the secondary output is 18 V, if the load needs to be supplied with 33 V voltage, the secondary of two oil immersed transformers can be connected in series. The secondary series connection of oil immersed transformer is also very easy, and different secondary outputs can be applied as long as the power of a single oil immersed transformer is guaranteed. Under ideal conditions, the primary input voltages of multiple oil immersed transformers are the same, and the total output formula is: vtotal = vclinical / (V1 times + V2 times + VN times).

The secondary parallel connection of oil immersed transformer is applied when the secondary output voltage of a single oil immersed transformer is the same but the single power cannot be satisfied. Its application is to superimpose the secondary currents of several oil immersed transformers to meet the power demand of the load. The secondary parallel connection of oil immersed transformer can make the output power be the sum of the power of several oil immersed transformers.