Indirect Testing of Circuit Breaker: With the increase in the breaking capacity of the HV circuit breakers, it has become uneconomical and unpracticable to increase the short-circuit capacity of testing station. It is consequently necessary to utilize some form of Indirect Testing of Circuit Breaker. The important methods of Indirect Testing of Circuit Breaker are: […]
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Direct Testing of Circuit Breaker: The Direct Testing of Circuit Breaker in a plant enables us to test under conditions largely representing those in actual network as well as tests of greater severity. The circuit breaker to be tested is subjected to the value of transient restriking voltage to which it is expected to be
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Circuit Breaker Testing Procedure: A preliminary check up of various equipment is made before the actual Circuit Breaker Testing Procedure commences. The correct values of resistance and reactance coils are inserted as per the magnitude of the short-circuit current. Proper settings of transformers are made. The measuring circuits are connected and oscillograph loops are calibrated.
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Circuit Breaker Analyzer: Short Circuit Generator: This is of a special design having very low reactance in order to give the maximum short-circuit output of the Circuit Breaker Analyzer. The leakage reactance is reduced by reducing the depth of slots and the length of coil ends. The terminals are brought to a board where different
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Simple Testing Station: In these Testing Station the short-circuit power is supplied by specially designed short-circuit generators, driven by induction motors. A simplified diagram of such a testing station is shown in Fig. (18.1). The magnitude of the test voltage and the short-circuit current can be selected within wide limits by adjusting generator excitation and
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Circuit Breaker Tester Classification: Circuit Breaker Tester can be classified into two main groups, viz. (i) type tests and (ii) routine tests. Type Tests: These are performed solely for the purpose of proving the correctness of general design and the results of such tests conducted on a randomly selected breaker, are applicable to all others
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Design of Current Carrying Capacity Systems: The Current Carrying Capacity Systems of a circuit breaker consists not only of electrical conductors but also of mechanical devices like springs which do the dual job of passing the current as well as making and breaking contacts. In designing Current Carrying Capacity Systems it is, therefore, necessary to
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Insulation Design of Circuit Breaker: Insulation Design system of a circuit breaker requires solution of the following problems: Choice and calculation of the various clearances to be provided between the live parts and the dead parts in a circuit breaker. Calculation of voltages that will appear across each of the gaps in a multibreak system.
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Basic Design of Arc Extinction Chamber: The considerations for design for the Arc Extinction chamber used in oil circuit breakers and air-blast circuit breakers would naturally be different. As far as the oil circuit breakers are concerned, the design of the arc extinguishing chamber would involve: Calculation of the arc voltage at various instances of
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Basic Steps for Design of Circuit Breaker Types: It is well known that a Circuit Breaker Types in an electrical power system has to perform the following four major operations. When the contacts are closed and the rated current passes, there should be least voltage drop across the contacts. When the contacts are open it
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