Search Results for: TRANSFORMERS

Instrument Transformers – Definition, Types and Errors

Capacitor Potential Transformer Circuit Diagram

Instrument Transformers – Definition, Types and Errors: AC type protective relays are actuated by current and voltage supplied by current and potential (or voltage) transformers, known as instrument transformers. The main function of instrument transformers are: To provide insulation against the high voltage of the power circuit and to protect the apparatus and the operating […]

Instrument Transformers – Definition, Types and Errors Read More »

Differential Protection of Transformers

Differential Protection of Transformers: Differential Protection of Transformers is the most important type of protection used for internal phase-to-phase and phase-to-earth faults and is generally applied to transformers having ratings of 5 MVA and above. The principle of a differential relay is welt understood and discussed earlier. Any deviation from the normal ratio of the

Differential Protection of Transformers Read More »

Important Questions of Protection of Alternators and Transformers

Important Questions of Protection of Alternators and Transformers: 1. Discuss the important faults on an alternator. 2. Explain with a neat diagram the application of Merz-Price circulating current principle for the protection of alternator. 3. Describe with a neat diagram the balanced earth protection for small-size generators. 4. How will you protect an alternator from

Important Questions of Protection of Alternators and Transformers Read More »

Protection of Alternators and Transformers

Protection of Alternators and Transformers: Balanced Earth Fault Protection : In small-size alternators, the neutral ends of the three-phase windings are often connected internally to a single terminal. Therefore, it is not possible to use Merz-Price circulating current principle described above because there are no facilities for accommodating the necessary current transformers in the neutral

Protection of Alternators and Transformers Read More »

Transformers

Transformers: Approximate Equivalent Circuit of Transformer : Approximate Equivalent Circuit of Transformer – In constant frequency (50 Hz) … Audio Frequency Transformer : Audio Frequency Transformer is used at the output stage of Audio Frequency electronic … Back to Back Test of Transformer : The Back to Back Test of Transformer which consists of …

Transformers Read More »

Resonant Transformers

Resonant Transformers: The equivalent circuit of a high voltage testing Resonant Transformers consists of the leakage reactance of the windings, the winding resistances, the magnetizing reactance, and the shunt capacitance across the output terminal due to the bushing of the high voltage terminal and also that of the test object. This is shown in Fig.

Resonant Transformers Read More »

Applications of Power Transformers

Applications of Power Transformers: Transformers are the first to encounter lightning and other high voltage surges. The transformer insulation has to withstand very high impulse voltages many times the power frequency operating voltages. The Applications of Power Transformers insulation is broadly divided into Conductor or turn-to-turn insulation, Coil-to-coil insulation, Low voltage coil-to-earth insulation, High voltage

Applications of Power Transformers Read More »

Protection of Transformers

Protection of Transformers: Transformers are static devices, totally enclosed and generally oil immersed. Therefore, chances of faults occurring on them are very rare. However, the consequences of even a rare fault may be very serious unless the transformer is quickly disconnected from the system. This necessitates to provide adequate automatic Protection of Transformers against possible

Protection of Transformers Read More »

Tap Changing Transformers

Tap Changing Transformers: The excitation control method is satisfactory only for relatively short lines. However, it is not suitable for long lines as the voltage at the alternator terminals will have to be varied too much in order that the voltage at the far end of the line may be constant. Under such situations, the

Tap Changing Transformers Read More »

Scroll to Top