ABB RET670 Product Manual page 84

Transformer protection RET670
Pre-configured
Product version: 1.1
Table 88. IRIG-B
Quantity
Number of channels IRIG-B
Number of channels PPS
Electrical connector IRIG-B
Optical connector PPS and IRIG-B
Type of fibre
Inverse characteristic
Table 89. ANSI Inverse time characteristics
Function
Operating characteristic:
æ ö
A
ç ÷
= + ×
t B k
( )
ç ÷
P
è - ø
I 1
EQUATION1249-SMALL V1 EN
Reset characteristic:
t r
= ×
t k
( )
2
-
I 1
EQUATION1250-SMALL V1 EN
I = I /I
measured set
ANSI Extremely Inverse
ANSI Very inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI Long Time Extremely
Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
84
Rated value
1
1
BNC
Type ST
62.5/125 μm multimode fibre
Range or value
k = (0.05-999) in steps of 0.01
unless otherwise stated
A=28.2, B=0.1217, P=2.0 , tr=29.1
A=19.61, B=0.491, P=2.0 , tr=21.6
A=0.0086, B=0.0185, P=0.02, tr=0.46
A=0.0515, B=0.1140, P=0.02, tr=4.85
A=64.07, B=0.250, P=2.0, tr=30
A=28.55, B=0.712, P=2.0, tr=13.46
k=(0.05-999) in steps of 0.01
A=0.086, B=0.185, P=0.02, tr=4.6
1MRK 504 091-BEN B
Issued: June 2010
Accuracy
-
ANSI/IEEE C37.112,
class 5 + 30 ms
ABB