By Y.G. Paithankar, S.R. Bhide
Energy process is a hugely complicated dynamic entity. One malfunction or a slipshod set relay can jeopardize the full grid. energy procedure security as a topic deals all of the parts of intrigue, drama, and suspense whereas dealing with fault stipulations in genuine lifestyles.
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Fundamentals of Power System Protection
Strength process is a hugely complicated dynamic entity. One malfunction or a slipshod set relay can jeopardize the complete grid. strength process security as an issue bargains all of the components of intrigue, drama, and suspense whereas dealing with fault stipulations in actual existence.
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Example text
The percentage impedance of a transformer is 8% Determine the short-circuit current for a three-phase short circuit on the secondary terminals of the transformer. 2. 2 s. 5 s, determine the operating time of relay RA so that there is no loss of selectivity. 3. 6 s. 5 s. Investigate whether there will be any loss of selectivity between the primary and the backup protection. 4. The load current in a system is 100 A. The short-circuit current for the smallest fault is 1000 A. An over-current relay capable of carrying a current of 5 A continuously is to be used.
For example, consider a system where Zs >> ZL. Since the fault current as a function of fault location is proportional to E I f - Z " + z" -Lz cs E Zc , it would remain more or less constant throughout the length of the - feeder, therefore, the inverseness of the IDMT characteristics cannot be exploited. In such situations, DTOC relays being cheaper may be preferred. Such feeders are also described as electrically short in length, irrespective of their physical length. Thus we can say that DTOC relays are suitable for lines which are short in length.
The fault current that would result in case of a fault at a particular location depends upon: 1. e. whether it is a ground fault or a phase fault 2. 30. 30 Fault current and reach is a function of fault type and source impedance.
