Technical Data On Protection Functions - ABB REU 523 Technical Reference Manual

REU 523
4.1.4.7.
28
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
Non-volatile memory settings
The table below presents data which can be configured to be stored in the
non-volatile memory. All of the functions mentioned below can be selected
separately with switches 1...5 in "MEMORY SETTINGS".
Table 4.1.4.6-9 Memory settings
Switch Function
1 • 0 = alarm indication messages and LEDs will be cleared
• 1 = alarm indication messages and LEDs will be retained
2 • 1 = information on the "NUMBER OF STARTS" of the
protection stages will be retained
3 • 1 = disturbance recorder data will be retained
4 • 1 = event codes will be retained
5 • 1 = recorded data will be retained
6 Not in use
7 Not in use
8 Not in use
checksum

Technical data on protection functions

Table 4.1.4.7-1 Stages U> and U>>
Feature
Set start value
• at definite-time and IDMT
characteristic
Start time, typical
Time/voltage characteristics
• definite time
operate times t> and t>>
• IDMT
time multipliers k> and k>>
Resetting time, typical
Drop-off/pick-up ratio
Operate time accuracy at
definite-time characteristic
Operate time accuracy at
IDMT characteristic
Operation accuracy
• definite-time and IDMT
characteristic
Stage U>
0.60...1.40 x U
n
60 ms
0.06...600 s
A-curve
B-curve
0.05...2.00
70 ms
0.95...0.99
±2% of the set start value
or
±25 ms
±25 ms or the accuracy
appearing when the
measured voltage varies
±3%
±1.5% of the set start value ±1.5% of the set start value
1MRS 750942-MUM
Default
setting
1
1
1
1
1
0
0
0
31
Stage U>>
)
)
1
0.80...1.60 x U
n
50 ms
0.05...600 s
A-curve
B-curve
0.05...2.00
70 ms
0.97
±2% of the set start value
or
±25 ms
±25 ms or the accuracy
appearing when the
measured voltage varies
±3%