ABB Substation Automation
Products and Systems
User’s Guide
REJ 513
1MRS750613-MUM
17
2.1.3 Protection
2.1.3.1 Block
diagram
IL 1
IL 2
IL 3
I>
0.12 * I>
1.5 * I>
1.25 * I>
&
2 * I>>
SGF2/1
SGR3/x
SGR4/x
SGR2/x
SGR1/x
t> , k
I>>
SGB1/6
BI
SO2
t>>
SGB1/5
4
55 ms
30 ms
SO1
3
1
1
C
5 s
PO2
SGF1/2
2
0.1 ... 1 s
SGF1/1
C
5 s
SGF1/5
PO1
1
1
SGF2/3
1
C
I>
I>>
START
SGF1/4
1
t>
t>>
C
TRIP
SGF3/1...6
SGB1/4
SGB1/1
SGB1/2
SGB1/3
SGF1/3
40/80 ms
40/80 ms
40/80 ms
40/80 ms
SGF2/4, 5
RESET INDICATORS AND LATCHED OUTPUT RELAYS
RESET INDICATORS, LATCHED OUTPUT RELAYS AND REGISTERS
RESET INDICATORS
SETTINGS (Group 1 / Group 2)
Block5_3
Figure 2.1.3.1-1 Block diagram of the overcurrent relay
2.1.3.2
Overcurrent unit
When the phase currents exceed the set start current of the low-set stage I>, the
overcurrent unit starts delivering a start signal after a preset ~ 55 ms start time. When
the set operate time at definite-time operation or the calculated operate time at
inverse-time operation elapses, the overcurrent unit operates. In the same way, the
high-set stage I>> of the overcurrent unit starts delivering a start signal after a preset
~ 30 ms start time when the set start current is exceeded. When the set operate time
elapses, the overcurrent unit operates.
Summary of Contents for REJ 513
Page 71: ......