lecture18

lecture18 - March 2004 Power Systems I 1 Common Unbalanced...

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Unformatted text preview: March 2004 Power Systems I 1 Common Unbalanced Network Faults c Single-line-to-ground faults c Double-line-to-ground faults c Line-to-line faults March 2004 Power Systems I 2 Single Line to Ground Fault V a V b V c I a I b I c 1 1 1 1 1 3 1 2 1 3 1 2 1 2 2 2 1 = + + = = = = = = = = = a a a a a a a a a a a a c b a f a V V V V I I I I I a a a a I I I I I I I V March 2004 Power Systems I 3 Single Line to Ground Fault ( 29 ( 29 ( 29 ( 29 2 1 2 1 2 1 2 2 1 1 012 012 3 a f a a a a a a a a a a a a a a a a a a a a a a a a a I I I I I Z Z Z E I I Z Z Z E I Z I Z I Z E I Z A E I Z E V = = = + + = + +- = + +- =- = =- = Positive Sequence Negative Sequence Zero Sequence fault location in network Network Diagram I a March 2004 Power Systems I 4 Double Line to Ground Fault V a V b V c I a I b I c 2 1 2 2 2 1 2 1 1 1 1 1 1 3 1 a a a a a a a c b f a a a a c b V V V V a a a a V V V I I I I I I I V V = = = + = = + + = = = March 2004 Power Systems I 5 Double Line to Ground Fault ( 29 ( 29 2 2 2 2 2 1 1 2 1 2 1 2 1 1 2 2 1 2 1 1 1 , 1 Z V I Z V I Z Z Z Z Z V I Z Z Z Z Z Z Z Z V I Z Z Z Z V Z Z Z Z I a a a a a a a a a a- =- = + + = + + + = + = + + = Positive Sequence Negative Sequence Zero Sequence fault location in network Network Diagram I a 1 I a 2 I a March 2004 Power Systems I 6 Double Line to Ground Fault ( 29 ( 29 ( 29 ( 29 ( 29...
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lecture18 - March 2004 Power Systems I 1 Common Unbalanced...

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