FS300R12KE3/AGDR-72 ABB Input module application materials

Description

FS300R12KE3/AGDR-72 The 5th harmonic inhibit feature of the percent differential element allows inhibiting the

percent differential during intentional overexcitation of the system. This feature inhibits the

percent differential element in a particular phase if the 5th harmonic of the same phase

exceeds the harmonic inhibit level setting. FS300R12KE3/AGDR-72 With harmonic averaging enabled, all three

phases are inhibited if the three-phase average of the 5th harmonic exceeds the level

setting.

HARMONIC AVERAGING: Select “Enabled” to FS300R12KE3/AGDR-72 use the three-phase average of the 5th

harmonic current against the harmonic inhibit setting.

5th HARMONIC INHIBIT LEVEL: Enter the level of 5th harmonic current above which

the percent differential element will be inhibited from operating.

This section contains settings to configure the phase overcurrent elements. Included are

phase time overcurrents and two levels FS300R12KE3/AGDR-72 of phase instantaneous overcurrent for each

phase of each winding.

5.6.5.2 Time Overcurrent Curves

The inverse time overcurrent curves used by the time overcurrent elements are the ANSI,

IEC, and GE type IAC curve shapes. This allows for simplified coordination with downstream

devices. If however, none of these curve shapes is adequate, FlexCurves™ may be used to

customize the inverse time curve characteristics. The Definite Time curve is also an option

that may be appropriate if only simple protection is required.

The following overcurrent curve FS300R12KE3/AGDR-72 types are available:

ANSI curves: ANSI extremely inverse, ANSI very inverse, ANSI normally inverse, and

ANSI moderately inverse

IEC curves: IEC curves A, B, and C (BS142); IEC short inverse

GE type IAC curves: IAC extremely inverse, IAC very inverse, IAC inverse, and IAC short

inverse

Other curves: FlexCurves™ A, B, and C; definite time curve

A time dial multiplier setting allows selection of a multiple of the base curve shape (where

the time dial multiplier = 1) with the FS300R12KE3/AGDR-72 curve shape (SHAPE) setting. Unlike the

electromechanical time dial equivalent, operate times are directly proportional to the time

multiplier (TIME OC MULTIPLIER) setting value. For example, all times for a multiplier of 10

are 10 times the multiplier 1 or base curve values. Setting the multiplier to zero results in an

instantaneous response to all current levels above pickup

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