Tag Archives | Electrical Engineering

Distance Relays and Its Classification | Devices | Electrical Engineering

In this article we will discuss about distance relays and its classification. Introduction to Distance Relays: Distance protection is the name given to the protection, whose action depends upon the distance of the feeding point to the fault. The time of operation of such a protection is a function of the ratio of voltage and current i.e., impedance. This impedance [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Distance Relays|Comments Off on Distance Relays and Its Classification | Devices | Electrical Engineering

Induction Type Directional Relays | Devices | Electrical Engineering

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 non-directional element. The directional (or [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Induction Relays|Comments Off on Induction Type Directional Relays | Devices | Electrical Engineering

Differential Relays and Its Types | Devices | Electrical Engineering

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 of the current entering a [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Differential Relays|Comments Off on Differential Relays and Its Types | Devices | Electrical Engineering

Impedance Relay: Operation and Types | Devices | Electrical Engineering

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 relay" is very specific. An [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Impedance Relays|Comments Off on Impedance Relay: Operation and Types | Devices | Electrical Engineering

Static Relays: Need and Limitations | Devices | Electrical Engineering

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 to a relay in which [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Static Relays|Comments Off on Static Relays: Need and Limitations | Devices | Electrical Engineering

Classification of Static Relays | Devices | Electrical Engineering

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. Fitzgerald presented a carrier current [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Static Relays|Comments Off on Classification of Static Relays | Devices | Electrical Engineering

Static Distance Relays and Its Characteristics | Electrical Engineering

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 versatile family of distance relays [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Static Relays|Comments Off on Static Distance Relays and Its Characteristics | Electrical Engineering

Relays: Classification and Design | Devices | Electrical Engineering

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 in turn, if the abnormality [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Relays|Comments Off on Relays: Classification and Design | Devices | Electrical Engineering

Operating Principle of Different Relays | Electrical Engineering

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 some distinctive difference in these [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Relays|Comments Off on Operating Principle of Different Relays | Electrical Engineering

Electromagnetic Induction Relays and Its Structure | Electrical Engineering

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 interaction of electromagnetic fluxes with [...]

By |2018-03-07T08:16:34+05:30March 7, 2018|Relays|Comments Off on Electromagnetic Induction Relays and Its Structure | Electrical Engineering
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