ABB Relion Technical Manual page 99

Generator protection

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1MRK 502 048-UUS A

Technical manual

EQUATION1882-ANSI V1 EN

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 where, for equation

and equation 2:

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

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

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

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

is the fundamental frequency phase current in phase A on the W3 side

is the fundamental frequency phase current in phaseB on the W3 side

is the fundamental frequency phase current in phaseC on the W3 side

is transformer rated phase-to-phase voltage on the W1 side (setting parameter)

is transformer rated phase-to-phase voltage on the W2 side (setting parameter)

is transformer rated phase-to-phase voltage on the W3 side (setting parameter)

are three by three matrices with numerical coefficients

Values of the matrix A, B and C coefficients depend on:

The Power transformer winding connection type, such as wye (Y/y) or delta (D/d)

Note! The capitalized letter Y or D is used to represent the high voltage (HV)

side of the transformer and the smaller letter y or d to represent lower

voltage(LV) level. When neutral bushing of a wye winding is brought out, the

Differential protection

(Equation 2)

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