Monitoring - ABB REU 513 User Manual

ABB Substation Automation
Products and Systems
2.1.4.
1MRS750886-MUM
User's Guide
Table 12: Stages U< and U<<
Feature
Start voltage
• at definite-time and inverse-
time characteristics
Start time, typical
Time/voltage characteristic
• definite time
• operate times t< and t<<
• inverse-time characteristic
• time multipliers k< and k<<
Reset time
Drop-off/pick-up ratio
Operate time accuracy at
definite-time mode
Operate time accuracy at inverse-
time mode
Operation accuracy
• definite-time and inverse-time
characteristic
• positive-phase-sequence with
definite-time or inverse-time
characteristic
1) Note!
The reset time is normally 70 ms. In case the measured voltage that caused the
activation of the output relay falls below the set start voltage value within less than
the start time of the protection function stage added with the set minimum pulse
length for the activated relay, the reset time depends on the selected minimum pulse
length.

Monitoring

The function of the relay can be monitored with the help of three indicators on the
relay front panel: a green READY LED, a yellow START LED and a red TRIP
LED. The basic protection functions are independent of the state of the indicators.
For function of the LEDs, refer to part A, "Operator's instructions".
Stage U<
0.30...1.20 x U
n
80 ms
0.10...600 s
C-curve
0.10...2.00
1)
70 ms
1.01...1.05
±2 % of set value or
±25 ms
±25 ms or the accuracy
appearing when the
measured voltage varies
±3 %
±1.5 % of set value
REU 513
Stage U<<
and ∞
0.30...1.20 x U
n
50 ms
0.10...600 s
C-curve
0.10...2.00
1)
70 ms
1.03
±2 % of set value or
±25 ms
±25 ms or the accuracy
appearing when the
measured voltage varies
±3 %
±1.5 % of set value
±5 % of set value
33