The Art and Science of Protective Relaying by C. Russell Mason
By C. Russell Mason
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Extra resources for The Art and Science of Protective Relaying
Example text
Because all these relays are derived directly from the single quantity types described in Chapter 2, there is no need to consider further their principle of operation. ADJUSTMENT Pickup or Reset. Most overcurrent relays have a range of adjustment to make them adaptable to as wide a range of application circumstances as possible. The range of adjustment is limited, however, because of coil-space limitations and to simplify the relay construction. Hence, various relays are available, each having a different range of adjustment.
High-speed relays may or may not be affected, depending on the characteristics of their circuit elements. Generally, the pickup of high-speed relays is made high enough to compensate for any tendency to "overreach," as will be seen later, and no attempt is made to evaluate the effect of d-c offset. RATIO OF RESET TO PICKUP The ratio of reset to pickup is inherently high in induction relays; because their operation does not involve any change in the air gap of the magnetic circuit. This ratio is between 95% and 100% friction and imperfect compensation of the control-spring torque being the only things that keep the ratio from being 100%.
N. , 62 (1943), pp. 553-555. Discussions, pp. 972-974. "Principles of Induction-Type Relay Design," by W. E. Glassburn and W. K. , 72 (1953), pp. 23-27 3. "Harmonics May Delay Relay Operation," by M. A. Fawcett and C. A. Keener, Elec. World, 109 (April 9, 1935), p. 1226. Relay Systems, by I. T. Monseth and P. H. , New York, 1935. FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND CHARACTERISTICS 35 3 CURRENT, VOLTAGE, DIRECTIONAL, CURRENT (OR VOLTAGE)-BALANCE, AND DIFFERENTIAL RELAYS Chapter 2 described the operating principles and characteristics of the basic relay elements.