ABB Relion 650 Series Technical Manual page 233

1MRK 506 326-UUS B
To avoid instability there is a hysteresis in the power function. The absolute hysteresis for stage
1(2) is 0.5 p.u. for Power1(2) ≥ 1.0 p.u., else the hysteresis is 0.5 Power1(2).
If the measured power drops under the (Power1(2) - hysteresis) value, the over-power function will
reset after 0.06 seconds. If the measured power comes over the (Power1(2) + hysteresis) value, the
under-power function will reset after 0.06 seconds. The reset means that the pickup signal will
drop out and that the timer of the stage will reset.
6.15.4.1 Low pass filtering
In order to minimize the influence of the noise signal on the measurement it is possible to
introduce the recursive, low pass filtering of the measured values for S (P, Q). This will 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
=
EQUATION1959-ANSI V1 EN-US
Where
S
S
old
S
Calculated
TD
Default value for parameter
given out without any filtering (that is without any additional delay). When
bigger than 0, the filtering is enabled. A typical value for
functions.
6.15.5 Technical data
Table 157: GOPPDOP, GUPPDUP (32/37) technical data
Function
Power level
Characteristic angle
Timers
1)
Accuracy valid for 50 Hz. At 60 Hz both accuracies are ±2.0%
2)
Accuracy valid for 50 Hz. At 60 Hz the accuracy is -50/+100%
3)
Accuracy valid for 50 Hz. At 60 Hz the accuracy is ±40%
Line distance protection REL650
Technical manual
( )
TD S
1
⋅ + − ⋅
Old Calculated
is a new measured value to be used for the protection function
is the measured value given from the function in previous execution cycle
is the new calculated value in the present execution cycle
is settable parameter by the end user which influence the filter properties
TD is 0.00 . With this value the new calculated value is immediately
Range or value
(0.0–500.0)% of
(1.0-2.0)% of
(2.0-10)% of
(-180.0–180.0) degrees
(0.010 - 6000.000) s
© Copyright 2011 ABB Power Grids. All rights reserved
TD=0.92 in case of slow operating
Accuracy
SBase
± 1.0% of S
± 1.0% of S at S > S
SBase
< ± 50% of set value
SBase
< ± 20% of set value
2 degrees
± 0.5% ± 25 ms
Current protection
SEMOD172136-39 v3
(Equation 49)
TD is set to value
SEMOD175152-2 v4
at S < S
r r
1)
r
2)
3)
Section 6
227