In this article we will discuss about induction type directional relays used in an electric circuit. Induction Type Directional Power Relay: The non-directional relay can operate for fault flow in either direction. In order to achieve operation for the fault flowing in a specific direction, it is necessary to add a directional element to the […]
Induction Type Directional Relays | Devices | Electrical Engineering
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Differential Relays and Its Types | Devices | Electrical Engineering
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Differential protective relaying is the most positive in selectivity and in action. It operates on the principle of comparison between the phase angle and magnitudes of two or more-similar electrical quantities. Comparing two electrical quantities in a circuit by means of differential relays is simple in application and positive in action. For example, in comparison […]
Impedance Relay: Operation and Types | Devices | Electrical Engineering
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It is noteworthy here that in electrical engineering, the term ‘impedance’ can be applied to resistance alone or reactance alone, or a combination of the two. In protective relaying terminology, however, an impedance relay has a characteristic that is different from that of a relay responding to any component of impedance and therefore, the “impedance […]
Static Relays: Need and Limitations | Devices | Electrical Engineering
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In this article we will discuss about:- 1. Meaning of Static Relays 2. Need for Static Relays 3. Essential Components 4. Advantages 5. Limitations. Contents: Meaning of Static Relays Need for Static Relays Essential Components of Static Relays Advantages of Static Relays Limitations of Static Relays 1. Meaning of Static Relays: A static relay refers […]
Classification of Static Relays | Devices | Electrical Engineering
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Static relays are classified according to the type of the measuring unit or comparator as follows: 1. Electronic Relays 2. Transductor (Magnetic Amplifier Relays) 3. Rectifier Bridge Relays 4. Transistor Relays 5. Hall Effect Relays 6. Gauss Effect Relays. 1. Electronic Relays: These were the first to be developed in the series of static relays. […]
Static Distance Relays and Its Characteristics | Electrical Engineering
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Distance relays are characterised by having two input quantities proportional to the voltage and current at a particular point in the power system, referred to as the relaying point. Ideal static distance relays have characteristics independent of actual magnitudes of voltage and current but dependent only on their ratio and phase angle between them. The […]
Relays: Classification and Design | Devices | Electrical Engineering
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In this article we will discuss about the classification and design of relays used in an electric circuit. Classification of Relays: The protective relay may be defined as an electrical device interposed between the main circuit and the circuit breaker in such a manner that any abnormality in the circuit acts on the relay, which […]
Operating Principle of Different Relays | Electrical Engineering
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All the relays employed for protection against short circuits operate by virtue of the current and/or voltage supplied to them by CTs or PTs. Failures in the system are indicated by the individual or relative changes in the currents or voltages supplied to the protective relaying equipment. For every type and location failure, there is […]
Electromagnetic Induction Relays and Its Structure | Electrical Engineering
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Electromagnetic induction relays are the most widely used relays for protective relaying purposes involving only ac quantities. These relays operate on the simple principle of split-phase induction motor. Actuating force is developed on a moving element, that may be a disc or other form of rotor of non-magnetic current-conducting material (such as aluminium), by the […]
Comparators: General Equation and Analysis | Electrical Engineering
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The application of a particular relay is governed by its characteristics and other factors such as accuracy, operating time, reliability, burden, method of setting adjustment etc. The function of a protective relay is to sense any abnormal condition in the system and send a signal to the breaker which in turn isolates the faulty section […]