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7SR10 Description of Operation
©2018 Siemens Protection Devices Limited Chapter 1 Page 41 of 77
≥
1
≥
1
General Pickup
51-n
51c- n Setting
51c- n Charact
51c- n Time Mult
51c- n Follower D TL
c
51c- n Reset
Cold Load
Enabled
L 1 Dir En
L 2 Dir En
L 3 Dir En
Disabled
51c- n Min. Operate Time
Reduced
Current
Enabled
Disabled
51c- n Delay (DTL)
CB Open
CB Closed
Pick- up Time
Drop- off Time
Reduced Current DTL
Reduced
Current Level
c
<
IL1
IL2
IL3
51c
See Delayed
Overcurrent
(51-n)
≥
1
&
S
R
Q
&
&
&
CB
Open
CB
Closed
c
P ickup
tri p
c
P ickup
tri p
c
P ickup
tri p
<
<
Inhibit Cold Load
Figure 3-17 Logic Diagram: Cold Load Settings (51c)
3.4.6 Current Protection: Negative Phase Sequence Overcurrent - (46NPS)
The negative sequence phase (NPS) component of current (I2) is derived from the three phase currents. It is a
measure of the quantity of unbalanced current in the system.
When the device is applied to reverse sequence networks, i.e. 1-3-2, the NPS/PPS sequence is corrected
automatically by the
Gn Phase
Rotation setting in the
CT/VT Config menu.
Two NPS current elements are provided –
46IT and 46DT
.
The 46IT element can be configured to be either definite time lag (DTL) or inverse definite minimum time (IDMT),
46IT Setting
sets the pick-up current level for the element.
A number of shaped characteristics are provided. An inverse definite minimum time (IDMT) characteristic is
selected from IEC and ANSI curves using
46IT Char
. A time multiplier is applied to the characteristic curves using
the
46IT Time Mult
setting. Alternatively, a definite time lag delay (DTL) can be chosen using
46ITChar
. When
Definite Time Lag (DTL) is selected the time multiplier is not applied and the
46IT Delay (DTL)
setting is used
instead.
The
46IT Reset
setting can apply a
definite time delayed
or
ANSI (DECAYING)
reset.
The 46DT element has a DTL characteristic.
46DT Setting
sets the pick-up current and
46DT Delay
the follower
time delay.
Operation of the negative phase sequence overcurrent elements can be inhibited from:
Inhibit 46IT
A binary or virtual input.
Inhibit 46DT
A binary or virtual input.
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