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In order to connect Transformers in parallel you need to make sure that they have the same voltage-ratio, same percentage impedance, same polarity and same phase sequence.
if voltage ratio is not acheived, you will get different voltages on the seconday sides of the parallelled transformers which will lead to circulating currents and unnecessary losses. since the impedance of transformers is small, any difference in voltage will lead to considerable circulating currents and eventually increasing the I2R losses
if the same percentage impedance, polarity and phase sequence is not acheived, you will get a dead short circuit on your seconday sides of the transformers.
What else can I help you with?
Can two electric resistors connect in both series and parallel?
yes two resistors can connect both in series and parallel because when you connect two resistors in a closed loop, the same intensity of current flows across them and also they are connected to the same nodes which are the conditions for series and parallel connections respectively.
Why transformer does not rotate when its secondary is connected to bearing?
How do you connect the transformer's secondary to the bearings.
Why vector group is required?
There are various ways in which you can connect a three-phase transformer's primary and secondary windings, or in which you can connect three single-phase transformers to create a three-phase transformer bank. For example: wye-wye, wye-delta, delta-delta, delta-wye, etc.For each connection, there is a natural phase shift between the primary and secondary line voltages. This is called the angular displacement (or 'phase displacement') of the transformer connection.If you wish to parallel two three-phase transformers, or two three-phase transformer banks, then their angular displacements must be the same (there are also other requirements not relevant to this answer).A vector group is a method of specifying a three-phase transformer (or transformer bank) method of connection and its angular displacement. Transformer connections from the same group can be paralleled. Those in different groups cannot
How can you connect burden in current transformer?
Yes
What happens if you connect two transistors parallel?
If you connect two transistors parallel it will heat up and be damaged.
What will happen if the transformers working in parallel are not connected with regard to polarity?
when two transformer are connected in parallel condition,and the polarity of transformer are opposite to each other then a large circulating current flow through out the winding,therefore a very small current flow thro, the load .therefore lifespan of transformer will be reduced.
How do you connect an earthing transformer with delta connected secondary?
You have to connect each phase (R,Y & B respectively) of earthing transformer zig zag winding to each phase of power transformer delta secondary respectively. Then the zig zag winding of earthing transformer star point to be earthed.
Parallel operation of single phase transformer?
It is required to connect a second transformer in parallel with the first transformer if the load exceeds the rating of the transformer shown in Figure 1.46. The primary windings are connected to the supply bus bars while the secondary windings are connected to the load bus bars. During paralleling of the transformer, similar polarities of the transformers should be connected to the same bus bars shown in Figure 1.46. Otherwise, the two emfs induced in the secondary windings with incorrect polarities will produce the equivalent of a dead short circuit shown in Figure 1.47.The following conditions are important for parallel opera-tion of transformers:The voltage ratings of both the primary and the secondary of the transformers should be identical. Small differences are permissible if the resultant circulating currents can be tolerated.The connections of the transformers should be proper with respect to their polarities.The percentage impedances should be equal in magnitude and the X/R ratio must be the same to avoid circulating current and operation at different power factors.The equivalent impedances must be inversely proportional to the respective kVA ratings.The above conditions must be satisfied by paralleling transformers of identical ratings of the same make/model. With different kVA ratings of even the same make/model, the effects in steps 1, 2 and 3 may appear in undesirable amounts. Step 2 must be carried out satisfactorily even if steps 1, 3 and 4 are slightly modified.Figure 1.46 Parallel Operation of TransformersFigure 1.47 Parallel Operation of Transformers with Incorrect Polaritiesby keshav basyalpokharauniversitypokhara nepal
How do you wire a doorbell transformer?
To wire a doorbell transformer, first turn off the power to the circuit. Connect the transformer's black wire to the power source's black wire, and the white wire to the white wire. Then, connect the transformer's low-voltage wires to the doorbell's wires. Finally, turn the power back on and test the doorbell.
Can we connect metering and protection parallel with current transformer?
Technically YES, but state authorities do not approve the method. The purpose of both application is different and hence the design of class of accuracy, rating etc would be different for both application.
How do you connect an earthing transformer with star connected secondary?
transformers transform
How can you determine the polarity of the leads of a transformer rectifier so you can connect a suitable plug?
rectifiers have two terminals.it has a circular ring printed on its body.this terminal is negative or n type.but when you connect any terminal of a rectifier to any of the leads of transformer it works reverse.e.g if u connect -ve terminal to the transformer it will give +ve potential,so the other terminal of transformer without rectifier will give -ve potential.
