Protection; Block Diagram; Overvoltage Unit - ABB REU 523 Technical Reference Manual

1MRS 750942-MUM
4.1.3.
4.1.3.1.
4.1.3.2.
ABB Automation
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual

Protection

Block diagram

U
12
U
23
U
31
SGB1/5
SGF2/6
SGB1/6
BI
SGB1/7
0.20 Un
SGF2/4
U1s
SGF2/2
0.20 Un
SGF2/5
SGB1/8
SGB1/1
RESET INDICATORS
SGB1/2
RESET INDICATORS AND LATCHED OUTPUT RELAYS
SGB1/3
RESET INDICATORS, LATCHED OUTPUT RELAYS AND REGISTERS
SGB1/4
SETTINGS (Group 1 / Group 2)
)LJ  %ORFN GLDJUDP RI WKH FRPELQHG RYHUYROWDJH DQG XQGHUYROWDJH
UHOD\ 5(8 

Overvoltage unit

When one or several of the measured voltages exceed the set start value of the low-
set stage U> and the preset start time of ~ 60 ms elapses, the overvoltage unit begins
delivering a start signal. Further, when the set operate time for the low-set stage at
definite-time operation or the calculated operate time at inverse-time operation
passes, the overvoltage unit operates.
In the same way as the low-set stage, the high-set stage U>> of the overvoltage unit
begins delivering a start signal after a preset ~ 50 ms start time when the set start
value is exceeded. When the set operate time for the high-set stage at definite-time
operation or the calculated operate time at inverse-time operation elapses, the
overvoltage unit operates.
SGR1/x
60 ms
U>
t>, k>
SGR2/x
SGF4/1...2
U>>
SGR3/x
50 ms
t>>, k>>
SGR4/x
SGF4/3...4
SGR5/x
80 ms
U<
t<, k<
SGR6/x
SGF4/5
SGF1/3
&
U<<
SGR7/x
50 ms
SGF2/7
t<<, k<<
SGR8/x
&
SGF4/6
REU 523
5 s
C
SGF1/1
1
1
40/80 ms
SGF1/5
0.1 ... 1s
C 5 s
SGF1/2
1
2 1
40/80 ms
SGF1/4
3
40/80 ms
4
40/80 ms
U>
U>>
START
1
U<
U<<
C
SGF3/1, 3, 5,7
t>
t>>
TRIP
1
t<
t<<
C
SGF3/2, 4, 6, 8
PO1
PO2
SO1
SO2
13