ABB REF 610 - Page 67

67
Feature Stage I> Stage I>> Stage I>>>
*
at definite-time
characteristic
±2% of the set
operate time or ±25
ms
±2% of the set
operate time or ±25
ms
±2% of the set
operate time or ±25
ms
*
at IDMT characteristic
according to IEC 60255-
3: accuracy class index
E
5
*
at IDMT characteristic
according to
IEEE C37.112
±7% of the
calculated operate
time
*
at RI-type characteristic ±7% of the
calculated operate
time
*
at RD-type characteristic
(RXIDG)
±7% of the
calculated operate
time
Operation accuracy
*
0.3...0.5 x I
n
±5% of the set start
value
*
0.5...5.0 x I
n
±3% of the set start
value
±3% of the set start
value
±3% of the set start
value
*
5.0...35.0 x I
n
±3% of the set start
value
±3% of the set start
value
a)
Because of the maximum measured current (50 × I
n
), the setting value 2.5 is used for the IDMT
calculation if the set value is greater than 2.5. 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 5.1.4.11.-2 Stages I
0
> and I
0
>>
Feature Stage I
0
> Stage I
0
>>
Set start value, I
0
> and I
0
>>
*
at definite-time
characteristic
1.0...100% I
n
5.0...800% I
n
*
at IDMT characteristic 1.0...100% I
n
a)
Start time, typical 60 ms 50 ms
Time/current characteristic
*
definite time
operate time, 51N TDLY and
50N TDLY
0.05...300 s 0.05...300 s
*
IDMT according to
IEC 60255-3
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
time multiplier, k
0
0.05...1.00
*
Special type of IDMT
characteristic
RI-type inverse
RD-type inverse
time multiplier, k
0
0.05...1.00
*
IDMT according to
IEEE C37.112
Extremely inverse
Very inverse
Inverse
Feeder Protection Relay
Technical Reference Manual
REF 610REF 610
1MRS755310