Setting Hints; Settings Of The Forward Active Power Supervision - Siemens Siprotec 7UM62 Manual

Functions

2.16.2 Setting Hints

General
Pick-up Values
Time Delays

2.16.2.1 Settings of the Forward Active Power Supervision

Addr. Setting Title
3201 FORWARD
POWER
3202 Pf<
3204 T-Pf<
3203 Pf>
3205 T-Pf>
3206A MEAS. METHOD
120
The forward active power protection is only effective and accessible if this function
was set within the framework of the protective function configuration (section 2.2,
0132, FORWARD POWER = Enabled. Set Disabled if the function is not
address
required. The address 3201 FORWARD POWER, serves to switch the function ON or OFF
or to block only the trip command (Block Relay).
The setting of the forward power protection depends on the intended purpose. For this
reason, general setting instructions are not possible. The pickup values are set in
percent of the secondary apparent power rating S
Consequently, the machine power must be converted to secondary quantities:
P
-------------- -
Setting =
S
Nsec
with P secondary active power according to setting value
sec
Secondary rated power = √3 ⋅ U
S
Nsec
P Active power of machine according to setting value
mach
S Rated apparent power of machine
N mach
U Rated voltage of machine
N mach
I Rated current of the machine
N mach
U Primary rated voltage of voltage transformers
N prim
I Primary rated current of current transformers
N prim
Address 3202 serves to set the threshold of the forward power to an underrange (Pf<)
and address 3203 (Pf>) serves to set it to overrange. Addresses 3204 T-Pf< and
3205 T-Pf> serve to set the associated time delays.
In address 3206A MEAS. METHOD the user can select whether a fast or a precise
measuring procedure must be used for the forward power calculation. In most cases,
the precise measuring procedure is preferred in the power station sector (as a rule),
whereas the fast procedure is applied for use as network decoupling.
The set times are additional time delays not including the operating times (measuring
time, drop-out time) of the protective function.
Setting Options
OFF
ON
Block relay for trip com-
mands
0.5..120.0 %
0.00..60.00 sec; ∞
1.0..120.0 %
0.00..60.00 sec; ∞
Method accurate
Method fast
P U
sec mach N mach
⋅
------------------- - -------------------- -
=
S U
N mach N prim
Default Setting
OFF
9.7 %
10.00 sec
96.6 %
10.00 sec
Method accurate
= √3 ⋅ U ⋅ I
Nsec Nsec Nsec
I
N mach
⋅
----------------- -
I
N prim
⋅ I
Nsec Nsec
Comments
Forward Power Supervision
P-forw.< Supervision Pickup
T-P-forw.< Time Delay
P-forw.> Supervision Pickup
T-P-forw.> Time Delay
Method of Operation
C53000-G1176-C149-3
.
7UM62 Manual