ABB RER620

1MAC309294-MB F Section 4
Protection functions
RER620 141
Technical Manual
Table 163: Monitored data values
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 and the Time adder time has expired,
the TRIP output is activated.
When the user programmable IDMT curve is selected, the operate 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. If
the drop-off situation continues, the reset timer is reset and the PICKUP output is
deactivated.
The setting Time multiplier is used for scaling the IDMT trip and reset times.
Monitored data values Description
FAULT_DIR The detected direction of fault during fault situations,
that is, when START output is active.
DIRECTION The momentary operating direction indication
output.
ANGLE Also called operating angle, shows the angle
difference between the VG (polarizing quantity) and
Io (operating quantity).
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 = Io x sin(ANGLE). If
the
Operation mode setting is “IoCos”, I_OPER is
calculated as follows I_OPER = Io x cos(ANGLE).
The “Inverse reset” selection is only supported with ANSI or user
programmable curves. If another operating curve type is selected, an
immediate reset occurs during the drop-off situation.