I
̲
neg
=
1
3
⋅
| (
I
̲
A
+ a
̲
2
I
̲
B
+ a
̲
I
̲
C
) |
Phase sequence A-C-B:
I
̲
neg
=
1
3
⋅
| (
I
̲
A
+ a
̲
I
̲
B
+ a
̲
2
I
̲
C
) |
a
̲
=
e
j
120°
a
̲
2
=
e
j
240°
The negative-sequence current is monitored by the P631 to detect when it
exceeds the set thresholds. Alternatively, two different thresholds can be active.
The “dynamic” thresholds are active for the set hold time for the “dynamic
parameters” (see
) and the “normal” thresholds are
active when no hold time is running. The IDMT protection will trigger when the
1.05-fold of the set reference current value is exceeded. Dependent on the
characteristic selected and the negative-sequence current magnitude the P631
will determine the tripping time. Furthermore, a minimum tripping time can be
set; the tripping time will not fall below this minimum independent of the
magnitude of the current.
The negative-sequence current stage of the IDMT protection function can
optionally be blocked by the inrush stabilization function of differential
protection.
3 Operation
P631
P631/EN M/R-11-C // P631-310-650
3-139
Summary of Contents for P631
Page 2: ......
Page 4: ......
Page 7: ...Changes after going to press...
Page 8: ......
Page 16: ...P631 Table of Contents 8 P631 EN M R 11 C P631 310 650...
Page 56: ...P631 2 Technical Data 2 28 P631 EN M R 11 C P631 310 650...
Page 236: ...P631 3 Operation 3 180 P631 EN M R 11 C P631 310 650...
Page 246: ...P631 4 Design 4 10 P631 EN M R 11 C P631 310 650...
Page 266: ...P631 5 Installation and Connection 5 20 P631 EN M R 11 C P631 310 650...
Page 276: ...6 8 Configurable Function Keys P631 6 Local Control HMI 6 10 P631 EN M R 11 C P631 310 650...
Page 548: ...P631 10 Commissioning 10 10 P631 EN M R 11 C P631 310 650...
Page 568: ...P631 12 Maintenance 12 8 P631 EN M R 11 C P631 310 650...
Page 570: ...P631 13 Storage 13 2 P631 EN M R 11 C P631 310 650...
Page 572: ...P631 14 Accessories and Spare Parts 14 2 P631 EN M R 11 C P631 310 650...
Page 576: ...P631 15 Order Information 15 4 P631 EN M R 11 C P631 310 650...
Page 582: ...P631 A2 Internal Signals A2 4 P631 EN M R 11 C P631 310 650...
Page 608: ...P631 A4 Telecontrol Interfaces A4 18 P631 EN M R 11 C P631 310 650...
Page 637: ......