![background image](http://html1.mh-extra.com/html/abb/rec650-ansi/rec650-ansi_applications-manual_3390438065.webp)
•
1 out of 3
: at least one of the three-phase current shall be larger than the set level
to detect failure to break
•
1 out of 4
: at least one of the three-phase current and the residual current shall
be larger than the set level to detect failure to break
•
2 out of 4
: at least two of the three-phase current and the residual current shall
be larger than the set level to detect failure to break.
There is no residual current measurement protection on the 22 kV side of the
transformer. Therefore
1 out of 3
is chosen.
4.
Set
Pickup_PH
to
20 % of IBase
Pickup_PH
should be set lower than the smallest current to be detected by the
differential protection which is set 25 % of
IBase
.
5.
Set the re-tip time delay
t1
to
0 s
6.
Set
t2
to
0.17 s
The delay time of the breaker failure protection (BuTrip) is chosen according to
figure
.
The maximum open time of the circuit breaker is considered to be 100 ms.
The BFP maximum reset time is 15 ms.
A margin of about 2 cycles should be chosen. This gives a minimum setting of back-
up trip delay
t2
of about 155ms.
Time
The fault
occurs
Protection
operate time
Trip and Start
BFP
Normal t
cbopen
Margin
Retrip delay t1
t
cbopen
after re-trip
t
BFPreset
Minimum back-up trip delay t2
Critical fault clearance time for stability
en05000479.vsd
EN05000479 V1 EN
Figure 14:
Time sequences for breaker failure protection setting
1MRK 511 286-UUS A
Section 3
REC650 setting examples
59
Application manual
Summary of Contents for REC650 ANSI
Page 1: ...Relion 650 series Bay control REC650 ANSI Application manual...
Page 2: ......
Page 26: ...20...
Page 66: ...Section 3 1MRK 511 286 UUS A REC650 setting examples 60 Application manual...
Page 71: ...IED IED ANSI05000460 V2 EN 1MRK 511 286 UUS A Section 4 Analog inputs 65 Application manual...
Page 82: ...76...
Page 92: ...86...
Page 170: ...164...
Page 176: ...170...
Page 274: ...268...
Page 288: ...282...
Page 350: ...344...
Page 369: ...363...