By The Institution of Engineering and Technology
A suite of 4 volumes compiled by way of prime gurus within the electrical energy offer and production businesses to supply a finished therapy of strength procedure protection.Also available:Power procedure safeguard 1: rules and elements - ISBN 9780852968345Power approach safeguard four: electronic safeguard and signaling - ISBN 9780852968383The establishment of Engineering and know-how is likely one of the world's prime specialist societies for the engineering and know-how neighborhood. The IET publishes greater than a hundred new titles each year; a wealthy mixture of books, journals and magazines with a again catalogue of greater than 350 books in 18 various topic components together with: -Power & power -Renewable strength -Radar, Sonar & Navigation -Electromagnetics -Electrical dimension -History of expertise -Technology administration
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Extra info for Power System Protection. Vol.3: Application
Sample text
V. connection faults and provides basic logic for the automatic isolation of a faulty transformer and the restoration of healthy plant. Protection of generators and transformers 400 kV T 275 kV • -,,-t -_~ . . . w -~. . . - I "l .... I I I I I I ' ~---q I N I I ~------~ I l_--J - To compensati~m equipment I I I I I I I I ] fI- - 1 I I' f I r-~ f--I I I I_ I I I I -__4__~ t I [ I 1-I 3 3 kV F ig.
V. side of the transformer. Schematic diagrams of two manufacturer's schemes are illustrated in Fig. 7A and B. v. v. ; and Stage 2 operating after an adjustable number of pole slips, whether the system centre is within the generator transformer unit or out on the system. 1% to +10% on a 50 Hz basis. The protection must, of course, remain unoperated for steady state loading, power swinging and correctly cleared system fault conditions, although some of its component relays may operate. 8 Rotor earth-fault protection Two methods are available for the detection of earth faults in the rotor circuit.
C. c. ¢. Fig. 8A Rotor earth-fault detection using negative~potential biasing device for alarm only as there is no immediate danger to the set. 2. It will be seen that with both of these schemes the earth return path is through the body of the rotor. Since, however, the contact between rotor and stator is through the bearing oil film which is non- (or intermittently) conducting, it is essential to earth the rotor shaft by an additional earthed brush. This also serves the essential purpose of discharging static electricity induced in the turbine rotor by steam friction, thereby preventing the beating surfaces from pitting.