ABB REU 523 - Protection

14
1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
4.1.4. Protection
4.1.4.1. Block diagram
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4.1.4.2. Overvoltage unit
When the voltage values exceed the set start value of low-set stage U>, the
overvoltage unit will start to deliver a start signal after a ~ 60 ms’ start time. When
the set operate time at definite-time characteristic or the calculated operate time at
IDMT characteristic elapses, the overvoltage unit will deliver a trip signal.
When the voltage values exceed the set start value of high-set stage U>>, the
overvoltage unit will start to deliver a start signal after a ~ 50 ms’ start time. When
the set operate time at definite-time characteristic or the calculated operate time at
IDMT characteristic elapses, the overvoltage unit will deliver a trip signal.
It is possible to block the tripping of an overvoltage stage by applying an external
binary input signal to the relay.
The high-set stage can be set out of operation. This state will be indicated by dashes
on the LCD and by “999” when the set start value is read via serial communication.
SGR2/x
SGR1/x
1
1
SGR7/x
SGR8/x
SGR6/x
SGR5/x
U<<
t<<, k<<
U>
U>>
U<
U<<
t>
t>>
t<
t<<
60 ms
50 ms
SGF2/5
SGF2/2
SGB1/6
BI
SGB1/5
SGB1/8
SGR3/x
SGR4/x
U>>
t>>, k>>
50 ms
SGF2/6
SGF4/3...4
SGF2/7
t<, k<
SGB1/7
U
U
U
U>
t>, k>
SGF4/1...2
U<
80 ms
SGF4/5
C
SGF3/1, 3, 5,7
SGF3/2, 4, 6, 8
SGF2/4
&
&
U1s
BlockU5_3
C
0.20 Un
0.20 Un
SGF4/6
12
23
31
SGB1/4
SGB1/1
SGB1/2
SGB1/3
2
1
PO1
SGF1/1
40/80 ms
SGF1/5
PO2
5 s
1
0.1 ... 1s
SGF1/4
40/80 ms
C
SO1
3
SO2
4
SGF1/3
40/80 ms
40/80 ms
SGF1/2
1
5 s
C
1
SGF2/8
START
TRIP
CLEAR INDICATIONS AND MEMORIZED VALUES; UNLATCH
OUTPUT CONTACTS
CLEAR INDICATIONS AND UNLATCH OUTPUT CONTACTS
CLEAR INDICATIONS
SETTINGS (Group 1/Group 2)