Technical Data On Protection Functions - ABB REU 610 Technical Reference Manual

REU 610
5.1.4.8.
46
Voltage Relay
Technical Reference Manual

Technical data on protection functions

Table 5.1.4.8.-1 Overvoltage protection, stages U>, U>> and U
Feature
Set start value U>, U>> and U
-at definite-time characteristic
-at IDMT characteristic
Start time, typical
Time/voltage characteristic:
-definite-time operate time, t>, t>> 0.06...600 s
-IDMT
time multiplier, k>, k>>
Resetting time, typical/maximum 70/80 ms
Retardation time, typical
Set resetting time, t >
r
Drop-off/pick-up ratio, D/P>
Operate time accuracy:
-at definite-time characteristic
-at IDMT characteristic
Operation accuracy
-0.05...0.15 × U
n
-0.15...1.00 × U
n
a)
Because of the maximum measured voltage (2 × U
calculation if the set value is greater than 1.25. This makes the operate time faster than the theoretical
IDMT curve. However, the stage always starts according to the set value.
b)
Resetting time of the trip signal.
Table 5.1.4.8.-2 Undervoltage protection, stages U<, U<< and U
Feature
Set start value U<, U<< and U
-at definite-time characteristic
-at IDMT characteristic
Start time, typical
Time/voltage characteristic:
-at definite operate time, t<, t<<
-IDMT
time multiplier, k<, k<<
Resetting time, typical/maximum 70/80 ms
Stage U> Stage U>>
>:
2
0.60...1.40 × U 0.80...1.60 × U
n
a)
0.60...1.25 × U 0.80...1.25 × U
n
60 ms 50 ms
0.05...600 s
curve A curve A
curve B curve B
0.05...2.00 0.05...2.00
b)
70/80 ms
30 ms 30 ms
0.07...60.0 -
0.95...0.99 0.95...0.99
±2% of the set ±2% of the set
operate time or operate time or
±25 ms ±25 ms
±25 ms or the ±25 ms or the
accuracy accuracy
appearing when appearing when
the measured the measured
voltage varies voltage varies
±3% ±3%
±1.5% of the set ±1.5% of the set
start value start value
- -
- -
), the setting value 1.25 is used for the IDMT
n
Stage U< Stage U<<
<:
1
0.20...1.20 × U 0.20...1.20 × U
n
0.20...1.20 × U 0.20...1.20 × U
n
80 ms 50 ms
0.10...600 s 0.10...600 s
curve C curve C
0.10...2.00 0.10...2.00
a)
70/80 ms
1MRS755769
>
2
Stage U >
2
0.05...1.00 × U
n n
a)
0.05...1.00 × U
n n
50 ms
0.05...600 s
curve A
curve B
0.05...2.00
70/80 ms
50 ms
-
0.96
±2% of the set
operate time or
±25 ms
±25 ms or the
accuracy
appearing when
the measured
voltage varies
±3%
-
±10% of the set
start value
±5% of the set
start value
<
1
Stage U <
1
0.20...1.20 × U
n n
0.20...1.20 × U
n n
50 ms
0.10...600 s
curve C
0.10...2.00
70/80 ms