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. […]
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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
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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
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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
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Air Break Circuit Breaker: The arc interruption process of Air Break Circuit Breaker is based on the natural deionization of gases by a cooling action. The arc is resilient and can be stretched, and has resistance which can be increased both by length and confinement. Hence the increase of arc resistance is so high that
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Automatic Switch Circuit Breaker: The Automatic Switch Circuit Breaker is the simplest circuit interruption device is the knife switch. By closing the switch against the action of a spring we have an automatic device in which the energy for opening the contacts is stored by the closing operation. Such a Automatic Switch Circuit Breaker device
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Duties of circuit breaker diagram: Under different circumstances Duties of circuit breaker diagram may be subjected to widely varying stresses. First of all the current varies from a few amperes due to no-load current of a transformer up to the heaviest short-circuit currents, which may amount to a hundred kilo amperes. Moreover the circuit impedance
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Current Chopping: When interrupting small inductive currents such as transformer excitation currents, circuit breakers tend to clear before the natural current zero is reached. This is because the low-current ionized conducting path may become prematurely unstable, forcing the low arc current to zero along a very steep wave front. This phenomenon is known as current
Interaction of Circuit Breaker: The circuit breaker performance can well be seen from the interaction between the breaker and the circuit. It is convenient to regard the short-circuit current i in the period around current zero as composed of two parts: the arc current ia and the transient current ic flowing in the capacitive part
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Characteristics of Rate of Rise of Restriking Voltage: The important Characteristics of Rate of Rise of Restriking Voltage which affect the circuit breaker performance are: amplitude factor, rate of rise of restriking voltage (RRRV). Amplitude Factor: The amplitude factor is defined as the ratio of the peak of transient voltage to the peak system frequency
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