Elements 51N And 50N - ABB REF610 Technical Reference Manual

REF610 REF610
70
Feeder Protection Relay
Technical Reference Manual - ANSI Version
Feature
at definite-time
*
characteristic
at IDMT characteristic
*
according to IEC 60255-
3: accuracy class index
E
at IDMT characteristic
*
according to
IEEE C37.112
at RI-type characteristic ±7% of the
*
at RD-type characteristic
*
(RXIDG)
Operation accuracy
0.3...0.5 x I
*
n
0.5...5.0 x I
*
n
5.0...35.0 x I
*
n
a)
Because of the maximum measured current (50 × I
calculation if the set value is greater than 2.5. This makes the operate time faster than the theoretical
IDMT curve. However, the element always pick up according to the set value.
b)
Resetting time of the trip signal.
Table 5.1.4.11.-2

Elements 51N and 50N

Feature
Set pickup value, 51N and
50N
at definite-time
*
characteristic
at IDMT characteristic
*
Pickup time, typical
Time/current characteristic
definite time
*
operate time, 51N TDLY and
50N TDLY
IDMT according to
*
IEC 60255-3
time dial,51N TD IEC
Special type of IDMT
*
characteristic
time dial,51N TD IEC
IDMT according to
*
IEEE C37.112
Element 51P Element 50P-1
±2% of the set ±2% of the set
operate time or ±25 operate time or ±25
ms ms
5 or ±25 ms
±7% of the
calculated operate
time or ±25 ms
calculated operate
time or ±25 ms
±7% of the
calculated operate
time or ±25 ms
±5% of the set
pickup value
±3% of the set ±3% of the set
pickup value pickup value
±3% of the set
pickup value
), the setting value 2.5 is used for the IDMT
n
Element 51N
1.0...100% I (CT)
n
a)
1.0...100% I (CT)
n
60 ms
0.05...300 s
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
0.05...1.00
RI-type inverse
RD-type inverse
0.05...1.00
Extremely inverse
Very inverse
Inverse
1MRS755535
Element 50P-2
±2% of the set
operate time or ±25
ms
±3% of the set pickup
value
±3% of the set pickup
value
Element 50N
5.0...800% I (CT)
n
50 ms
0.05...300 s