2.13 Forward Power Supervision
253
7UT613/63x Manual
C53000-G1176-C160-2
Delay Times The setting of the delay times depend on the application. In the example of transformer
switchover or also in case of generator switchover, a long delay (up to one minute =
60 s) will be set so that short-term load fluctuations do not result in repeated switcho-
ver. In case of network splitting, short delays are permitted, which, amongst others,
must conform with the time grading of the short-circuit protective relays.
For undershooting of active power, address 5113 T-Pf< applies and for the exceed-
ing of active power address 5116 T-Pf> applies.
the set times are additional time delays that do not include the operating times (mea-
suring time, dropout time) of the monitoring function. Please note that averaging over
16 periods is executed during "precise" measuring procedures; the operating time is
thus respectively higher. If a delay time is set to ∞, this does not result in a trip, how-
ever, the pickup will be indicated.
Measuring Proce-
dure
The measuring procedure can be set under address 5117 MEAS. METHOD. This pa-
rameter can only be set with DIGSI at Additional Settings. The option MEAS.
METHOD = accurate is mainly required if also small active power from great apparent
power must be calculated precisely, e.g. in generator range or in protected objects
with high reactive power. Please also note that the operating time in this option is
higher due to averaging over 16 periods. A precise measurement requires that the
angle errors of the current and voltage transformers are compensated by means of a
respective setting of the fault angle in address 803 CORRECT. U Ang (see section
2.1.4). Short trip times are possible with this option MEAS. METHOD = fast as the
power is determined over one period only.
2.13.3 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Ad-
ditional Settings.
The table indicates region-specific presettings. Column C (configuration) indicates the
corresponding secondary nominal current of the current transformer.
Addr. Parameter C Setting Options Default Setting Comments
5101 FORWARD POWER OFF
ON
Block relay
OFF Forward Power Supervi-
sion
5111 Pf< 1A 1.7 .. 3000.0 W 17.3 W P-forw.< Supervision
Pickup
5A 8.5 .. 15000.0 W 86.5 W
5112 P< fwd 0.01 .. 17.00 P/SnS 0.10 P/SnS Pick-up threshold P<
5113 T-Pf< 0.00 .. 60.00 sec; ∞ 10.00 sec T-P-forw.< Time Delay
5114 Pf> 1A 1.7 .. 3000.0 W 164.5 W P-forw.> Supervision
Pickup
5A 8.5 .. 15000.0 W 822.5 W
5115 P> fwd 0.01 .. 17.00 P/SnS 0.95 P/SnS Pick-up threshold P>
5116 T-Pf> 0.00 .. 60.00 sec; ∞ 10.00 sec T-P-forw.> Time Delay
5117A MEAS. METHOD accurate
fast
accurate Method of Operation
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