Category: Conventional Circuit Breaker

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 […]

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 […]

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 […]

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 […]

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 […]

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 […]

Air Blast Circuit Breaker

Air Blast Circuit Breaker: Air Blast Circuit Breaker – It is not possible to produce a low resistance arc without a considerable gas pressure so that the only type available employs a high-pressure gas blast sweeping across the contact space. The gases which can be used are compressed air, nitrogen, carbon dioxide, hydrogen and freon. […]

Multi Break Function of Circuit Breaker

Multi Break Function of Circuit Breaker: It has been pointed out earlier that a circuit breaker may comprise a single pair of contacts or a number of pairs in series operating simultaneously. Undoubtedly the single-break is the simplest arrangement, a single-break is generally desirable up to the echttps://www.digikey.inonomic limit of rating, which is usually about […]

Types of Arc Control Pots

Types of Arc Control Pots: There has been a continuous development in the types of arc control pots, the two basic forms of which are shown in Fig. (15.6). As the arc itself develops the pressure necessary to produce the blast for arc extinction it is to be expected that the pressure will increase as […]

Oil Circuit Breaker

Oil Circuit Breaker: Oil Circuit Breaker are extensively employed in our power systems. In these the properties of the arc are employed for arc extinction. Thus by using arc energy to crack the oil molecules, hydrogen gas may be generated which can be used to sweep, cool and compress the arc plasma and so deionize […]