[logikdia-vorwaertsleistungsueberwachung, 1, en_GB]
Figure 2-105
Logic diagram of the forward active power supervision
Setting Notes
General
The application of forward power monitoring is only possible in 3-phase protected objects. It can only be
assigned to a side of the main protected object or another measuring location. Furthermore, it is a prerequisite
that the device is connected to a three-phase voltage transformer set, that permits a sensible calculation of
the active power with the respective current transformer connection.
The forward power monitoring can only be effective and is only accessible if it has been set during configura-
tion under address 151 FORWARD POWER = Enabled (Section 2.1.3 Functional Scope).
Under address 5101 FORWARD POWER the forward power monitoring can be switched ON or OFF. Further-
more, the command can be blocked during enabled monitoring function (Block relay).
Pickup Values
For undershooting of a preset active power and the exceeding of another preset active power, one pickup
value each must be set.
If the forward power monitoring has been assigned to a side of the protected object, the pickup value can be
set directly as reference value (with reference to the nominal power of the respective side), thus under
address 5112 P< fwd for undershooting of active power and under address 5115 P> fwd for exceeding of
active power.
If, however, the forward power monitoring must be set in amps secondary, the active power must be
converted to a secondary value. The settings can then be effected under address 5111 Pf< for undershooting
of active power and under address 5114 Pf> for exceeding of active power.
The latter is always the case if the forward power monitoring has been assigned to a measuring location, and
not a side of the main protected object.
The following applies to the conversion:
[flexfkn-ansprechwert-250204-he, 1, en_GB]
2.13.2
Functions
2.13 Forward Power Supervision
230 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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