ABB 615 series Technical Manual page 417

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1MAC059074-MB A

615 series ANSI

Technical Manual

GUID-ADCF64D0-2E7F-4806-BE05-9F9D59137D9D V1 EN

Function module diagram

Directional calculation

The Directional calculation module monitors the angle between the operating quantity

(residual current IG or I0) and polarizing quantity (residual voltage VG or V0). The

operating quantity can be selected with the setting Io signal Sel. The selectable options are

"Measured IG" and "Calculated I0". The polarizing quantity can be selected with the

setting Pol signal Sel. The selectable options are "Measured VG" and "Calculated V0".

When the angle between operating quantity and polarizing quantity after considering the

Characteristic angle setting is in the operation sector, the module sends an enabling signal

to Level detector. The directional operation is selected with the Directional mode setting.

Either the "Forward" or "Reverse" operation mode can be selected. The direction of fault

is calculated based on the phase angle difference between the operating quantity IG or I0

and polarizing quantity VG or V0, and the value (ANGLE) is available in the monitored

In the phasor diagrams representing the operation of 32N, the polarity of the polarizing

quantity (residual voltage VG or V0) is reversed. Reversing is done by switching the

polarity of the residual current measuring channel (See the connection diagram in the

application manual).

If the angle difference lies between -90° to 0° or 0° to +90°, a forward-direction fault is

considered. If the phase angle difference lies within -90° to -180° or +90° to +180°, a

reverse-direction fault is detected. Thus, the normal width of a sector is 180°.

Protection functions

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