ABB RELION 670 Series Technical Manual page 126

Generator protection

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Differential protection

EQUATION1879 V1 EN-US

EQUATION1882-ANSI V1 EN-US

and where, for equation

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is the resulting Differential Currents

is the current contribution from the W1 side

is the current contribution from the W2 side

is the resulting Differential Currents

is the current contribution from the W1 side

is the current contribution from the W2 side

is the current contribution from the W3 side

and equation 2:

is the fundamental frequency differential current in phaseA (in W1 side primary

is the fundamental frequency differential current in phase B (in W1 side primary

is the fundamental frequency differential current in phaseC (in W1 side primary

is the fundamental frequency phase current in phaseA on the W1 side

is the fundamental frequency phase current in phaseB on the W1 side

is the fundamental frequency phase current in phaseC on the W1 side

is the fundamental frequency phase current in phaseA on the W2 side

is the fundamental frequency phase current in phase B on the W2 side

is the fundamental frequency phase current in phase C on the W2 side

1MRK 502 066-UUS B

(Equation 1)

(Equation 2)

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