By Y.G. Paithankar, S.R. Bhide
ISBN-10: 8120321944
ISBN-13: 9788120321946
Strength process is a hugely complicated dynamic entity. One malfunction or a clumsy set relay can jeopardize the whole grid. strength procedure security as a subject matter bargains all of the parts of intrigue, drama, and suspense whereas dealing with fault stipulations in actual existence.
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Additional resources for Fundamentals of Power System Protection
Example text
Where K is deflection constant, S is the spring constant, and D is the damping constant. All these constants depend upon the design of the relay. e. S, D and 1'. Now, At At t = 0; 6= i 6,,,t,,1 t = top; 6 = 0 We can find the operating time by finding the value of time t for which 6 becomes zero. The value of Finitial is decided by the time-multiplier setting. i I The exact analysis of the dynamics of induction disc is quite involved. However, it can be noted that by proper design of the magnetic circuit a wide range of characteristics from extremely inverse to definite time can be obtained.
These situations are different from those where directional relays are applied during fault conditions in the manner that, in case of the power relays, there is no collapse of system voltage. Directional relays for short circuit protection are so connected that they develop maximum operating torque under fault conditions. However, directional power relays are so connected that they develop maximum torque when direction of power flow reverses. 29). In order to be used as a power relay it can be fed with I, and Vc,.
3 Thermal Relays Thermal relays, of the bimetallic type, work on the principle of strain generated due to unequal linear expansion of two different metals as a result of heat generated by the 28 F~tr~dainirrerirnls o f Power Svsrerrr Prvtecrion passage of the fault current. 2(a) shows a bimetallic relay consisting of strips AB . and CD of two different materials. Both the strips get heated up by the same amount but are deformed by diqering amounts. 2(b) shows the rclay operation. The material .
Fundamentals of Power System Protection by Y.G. Paithankar, S.R. Bhide
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