make slower measurement response to the step changes in the measured quantity.
Filtering is performed in accordance with the following recursive formula:
S TD S TD S
Old Calculated
= ⋅ + −
( )
⋅1
EQUATION1959-ANSI V1 EN (Equation 30)
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 by the end user which influence the filter properties
Default value for parameter TD is 0.00. With this value the new calculated value is
immediately given out without any filtering (that is without any additional delay). When
TD is set to value bigger than 0, the filtering is enabled. A typical value for TD=0.92 in
case of slow operating functions.
6.11.5 Technical data
Table 104: GOPPDOP, GUPPDUP (32/37) technical data
Function
Range or value Accuracy
Power level (0.0–500.0)% of
SBase
± 1.0% of S
r
at S < S
r
± 1.0% of S at S > S
r
(1.0-2.0)% of
SBase
< ± 50% of set value
(2.0-10)% of
SBase
< ± 20% of set value
Characteristic angle (-180.0–180.0) degrees 2 degrees
Timers (0.010 - 6000.000) s ± 0.5% ± 25 ms
1MRK 511 287-UUS A Section 6
Current protection
161
Technical manual
To Next Page
Loading...
