Power System Protection and Switchgear

DC Circuit Breaker

DC Circuit Breaker: Light duty DC Circuit Breaker have been in use since long. However, with the latest developments in HVDC transmission there would naturally be the necessity of the HVDC circuit breaker. The two major problems of HVDC circuit breaking are: The amount of energy to be dissipated during the short interval of breaking […]

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SF6 Circuit Breaker

SF6 circuit breaker: One of the recent developments in the field of high voltage switchgear is the SF6 circuit breaker. In this a gas called sulphur hexafluoride is used as the medium of insulation and arc interruption. Basic Features of SF6 Breaker: SF6 is about 5 times heavier than air. It is chemically very stable,

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Vacuum Circuit Breaker

Vacuum Circuit Breaker: Although the advantages of interrupting the arc in a vacuum were recognized as early as the nineteenth century, this did not find wide application till a few years ago. This was because the knowledge of problems in material science, vacuum technology and plasma physics was not sufficiently advanced to provide solution to

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Merits and Demerits of Types of Conventional Circuit Breakers

Merits and Demerits of Types of Conventional Circuit Breakers: Having studied the operational principles, the constructional features and fields of application of the bulk oil, minimum oil and air-blast circuit breakers, it would be worthwhile to consider their relative merits and disadvantages of Conventional Circuit Breakers. (a) Bulk Oil Circuit Breakers: The main advantages of

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Non Linear Resistance Shunts

Non Linear Resistance Shunts: Non Linear Resistance are especially suitable, both from space and reliability considerations for small shunt currents in conditions where wire-wound resistors tend to be less satisfactory on mechanical grounds. Where heavy currents are involved, there may be difficulty in accommodating the relatively large volume of resistor material that is required. Non

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Linear Resistance Damping

Linear Resistance Damping: By introducing a linear resistance across the circuit breaker during interruption, the restriking transients are damped. Provision has to be made for subsequent interruption of the resistance circuit. Two such ways are shown in Fig. (15.27). In Fig. (15.27a) the resistor R is switched into circuit by the breakdown of the ionized

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Performance of Circuit Breaker System Requirements

Performance of Circuit Breaker System Requirements: Analysis of circuit interruption and the foregoing discussion of various circuit breakers apply to circuit breakers in practice if they had ideal switching characteristics. The ideal circuit Breaker System has a negligible are vol­tage and has the ability to develop instantaneously infinite arc-gap resistance at natural current zero. In

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Development of Airblast Circuit Breaker

Development of Airblast Circuit Breaker: The development of Airblast circuit breakers has taken place in three stages shown schematically in Fig. (15.19): Momentarily pressurized Airblast breakers with isomaker in the Momentarily pressurized air-blast breakers with isomaker in separate pressurized chamber. Permanently pressurized air-blast breakers with isomaker in separate pressurized chambers. In the first design air-blast

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Ultra High Voltage Circuit Breakers

Ultra High Voltage Circuit Breakers: The specific requirements demanded of a Ultra High Voltage circuit breaker by system and operator considerations are at present considered to be the following. Speed of Operation: For Ultra High Voltage systems the speed of breaker opera­tion is very important since a loss of stability would be most serious to

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