Siemens SIPROTEC 7UT63 series User Manual

2 Functions
252
7UT613/63x Manual
C53000-G1176-C160-2
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:
where
P
sec
secondary power
U
Nprim
primary rated voltage of the voltage transformer (inter-
linked)
U
Nsec
secondary rated current of the voltage transformer (in-
terlinked)
I
Nprim
primary rated current of the current transformer
I
Nsec
secondary rated current of the current transformer
P
prim
primary power
Example:
Transformer 16 MVA
(winding) 20 kV
Current transformer 500 A/5 A
Voltage transformer 20 kV/100 V
Switching off during P< 10 % = 0.1
Connecting a parallel transformer
Parallel transformer during P> 90 % = 0.9
In case of reference setting (with reference to the sides = winding data)
Address5112 P< fwd =0.10
Address 5115 P> fwd =0.90
When setting in watt secondary, this has the following effect
the setting values
Address 5111 Pf< =80W
Address 5114 Pf> = 720 W
P< =
P> =

Siemens SIPROTEC 7UT63 series Specifications

General

Brand	Siemens
Model	SIPROTEC 7UT63 series
Category	Protection Device
Language	English