S TD S TD S
Old Calculated
= ⋅ + −
( )
⋅1
EQUATION1893-ANSI V1 EN-US (Equation 230)
Where
S is a new measured value to be used for the protection function
S
old
is the measured value given from the function in previous execution cycle
S
Calculated
is the new calculated value in the present execution cycle
TD is settable parameter
The value of TD=0.92 is recommended in generator applications as the trip delay is
normally quite long.
The calibration factors for current and voltage measurement errors are set % of rated
current/voltage:
IMagComp5, IMagComp30, IMagComp100
VMagComp5, VMagComp30, VMagComp100
IAngComp5, IAngComp30, IAngComp100
The angle compensation is given as dif
ference between current and voltage angle
errors.
The values are given for operating points 5, 30 and 100% of rated current/voltage. The
values should be available from instrument transformer test protocols.
9.12 Negativ sequence time overcurrent protection for
machines NS2PTOC
(46I2)
GUID-25821361-229A-44BB-A60F-FC6DD9F4F140 v2
9.12.1 Identification
GUID-19BB1653-55AE-44D1-B964-F59AED5350C4 v3
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Negative sequence time overcurrent
protection for machines
NS2PTOC 2I2> 46I2
1MRK 502 071-UUS A Section 9
Current protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 417
Application manual
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