A Buchholz Relay is a gas-actuated safety device used in oil-immersed transformers to detect and protect against internal faults. It operates on the principle of gas accumulation or sudden oil flow caused by electrical faults inside the transformer. It is typically installed in the pipeline connecting the transformer’s main tank and the conservator.
When the transformer is on load, the secondary winding is connected with load as in figure (1) and current I2 is flowing through load. Operation of Transformer On load Figure (1) shows a transformer with a load connected across the secondary winding. The load current I2 flowing through the secondary turns sets up its own
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When the transformer is on no-load, the secondary winding is opened as in figure (a) and current I2 is zero. In this condition, the primary winding draws a no-load current ‘I0‘ which has two components i.e., Magnetizing component (Iµ), and Working component (Iw).
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Consider the two winding single-phase transformer shown in figure (1).
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The Open Circuit and Short Circuit Test on Transformer can be used to determine the efficiency and regulation of a transformer at any predetermined load for that we do not have to actually load the transformer. The parameters of the equivalent circuit of a transformer can be obtained by using the open circuit (O.C.) test
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A current transformer (CT) is nothing but a coil wound on a toroidal core. When a large current carried by a conductor is to be measured, it is advisable to avoid the direct connection of ammeter in this high current circuit. For this purpose a current transformer is used. Fig. 1 : Connection of Current
The three phase autotransformer is a combination of three single phase autotransformers. It has three windings, one per phase. Fig. 1 : 3 Phase Autotransformer.
What is 3 Phase Autotransformer? Working Principle, Connection Diagram & Applications Read More »
Unlike two winding transformer, an auto-transformer contains only one winding. This single winding serves the purpose of both primary as well as secondary. As this transformer employs only one winding, it uses less copper. Hence it is cheaper and more efficient.
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Tap changing transformers are transformers equipped with mechanisms (tap changers) to modify the number of turns in the primary or secondary windings. This adjustment changes the voltage ratio, allowing the output voltage to be regulated under varying input or load conditions. What is Tap Changing Transformer? A transformer with tappings on the primary or secondary
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Figure 1: Open Delta Connection of Transformer.
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