ABB RES670 Technical Manual page 889

Relion 670 series, phasor measurement unit

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1MRK 511 408-UUS A

Phasor measurement unit RES670 2.2 ANSI

Technical manual

EQUATION1640 V1 EN-US

For inverse time characteristics a time will be initiated when the current reaches the set

pickup level. From the general expression of the characteristic the following can be

EQUATION1642 V1 EN-US

is the operating time of the protection

The time elapsed to the moment of trip is reached when the integral fulfils according to

equation 89, in addition to the constant time delay:

EQUATION1643 V1 EN-US

For the numerical protection the sum below must fulfil the equation for trip.

are constants defined for each curve type,

is the set pickup current for step n,

is set time multiplier for step n and

is the measured current.

Inverse time characteristics

(Equation 87)

(Equation 88)

(Equation 89)

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