Table 345: Monitored data values
Monitored data values Description
FAULT_DIR The detected direction of fault during fault situations,
that is, when PICKUP output is active.
DIRECTION The momentary operating direction indication
output.
ANGLE
ANGLE_RCA
The angle difference between the operating angle
and
Characteristic angle
, that is, ANGLE_RCA =
ANGLE –
Characteristic angle
.
I_OPER
The current that is used for fault detection. If the
Operation mode
setting is "Phase angle", "Phase
angle 80" or "Phase angle 88", I_OPER is the
measured or calculated residual current. If the
Operation mode
setting is "IoSin", I_OPER is
calculated as follows I_OPER = IG x sin(ANGLE). If
the
Operation mode
setting is "IoCos", I_OPER is
calculated as follows I_OPER = IG x cos(ANGLE).
Monitored data values are accessible on the LHMI or through tools via communications.
Timer
Once activated, the timer activates the PICKUP output. Depending on the value of the
Operating curve type setting, the time characteristics are according to DT or IDMT. When
the operation timer has reached the value of Trip delay time in the DT mode or the
maximum value defined by the inverse time curve, the TRIP output is activated.
When the user-programmable IDMT curve is selected, the operation time characteristics
are defined by the parameters Curve parameter A, Curve parameter B, Curve parameter
C, Curve parameter D and Curve parameter E.
If a drop-off situation happens, that is, a fault suddenly disappears before the trip delay is
exceeded, the timer reset state is activated. The functionality of the timer in the reset state
depends on the combination of the Operating curve type, Type of reset curve and Reset
delay time settings. When the DT characteristic is selected, the reset timer runs until the set
Reset delay time value is exceeded. When the IDMT curves are selected, the Type of reset
curve setting can be set to "Immediate", "Def time reset" or "Inverse reset". The reset
curve type "Immediate" causes an immediate reset. With the reset curve type "Def time
reset", the reset time depends on the Reset delay time setting. With the reset curve type
"Inverse reset", the reset time depends on the current during the drop-off situation. The
PICKUP output is deactivated when the reset timer has elapsed.
The "Inverse reset" selection is only supported with ANSI or user
programmable types of the IDMT operating curves. If another operating
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 331
Technical Manual
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