Hi friends, In this article, I am going to describe the advantages and application of synchronous motor. Some characteristic features of this machine are as follows: 1. It runs at a constant speed (synchronous speed). The only way to change its speed is to vary the supply frequency. 2. It is not inherently self-starting. 3. […]
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Hi friends, In this article, I am going to explain the effect of excitation on the synchronous motor, V – curves and over excited synchronous motor. This article will help you to understand the behavior of these motors. When the rotor of the synchronous motor rotates an EMF is induced in its stator winding due
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Since a synchronous motor is inherently not self-starting, the following synchronous motor starting methods are adopted generally: Synchronous Motor Starting Methods Pony Motor Starting Method: In this method, a small induction motor known as pony motor is used to bring the motor speed to synchronous speed. After the speed has reached up to its synchronous
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Hi friends, In this article, I am going to discuss the synchronous motor working principle. I hope you will find it interesting and helpful. Synchronous motor construction is very similar to that of a synchronous generator. Essential parts of the synchronous motor are the same as those of the synchronous generator i.e., a stator and
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Hi friends, In this article, I am describing the construction of synchronous generator and hoping this article will boost your knowledge and imaginations. AC generators always run at a constant speed (synchronous speed). That is why they are also known as synchronous generators. Practically in all medium and large synchronous generators, the armature is housed
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In an air circuit breaker, we use the air as an arc quenching medium. The air has several advantages over oil as an arc extinguishing medium. These are as follows: Air Circuit Breaker Working Principle In the air circuit breakers, we extinguish the arc by increasing its resistance. We lengthen the arc with the help
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For the measurement of large currents and high voltages in AC circuits, specially constructed accurate ratio transformers are used in conjunction with low range AC instruments. These specially constructed transformers are known as instrument transformers. Types of Instrument Transformer There are two types of instrument transformer. These are: Potential Transformers (PTs) Current Transformers (CTs) These instrument
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Hi friends, In this article, I am explaining the vacuum circuit breaker working principle and construction, and hoping you would like my article. The high vacuum has a high dielectric strength, and the current interruption in the high vacuum occurs at the first current zero. These two properties of high vacuum make the vacuum circuit
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Hi friends, in this article, I am explaining the SF6 circuit breaker working principle and construction. This article will increase your knowledge; I hope so. In the oil circuit breakers, air circuit breakers and low oil circuit breakers, arc extinction take place slowly after the moment of contact separation. Hence, the arc is usually extinguished
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Hi Friends, In this article, I am going to discuss the circuit breaker working principle and hope you will find it interesting and useful. Circuit breakers are mechanical devices designed to make and break the electrical circuits under normal and abnormal conditions. Automatic circuit breakers, which are generally used for the protection of electrical circuits,
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