Energy - Siemens SIPROTEC 7SA522 Manual

2 Functions

2.21.7 Energy

2.21.7.1 Power Metering
2.21.7.2 Setting Notes
Retrieving Parame-
ters
2.21.7.3 Information List
No. Information
- Meter res
888 Wp(puls)
888 Wp(puls)
889 Wq(puls)
889 Wq(puls)
916 Wp∆=
917 Wq∆=
924 Wp+=
360
Metered values for real and reactive power are determined by the processor system
in the background. They can be displayed at the front of the device, read out via the
operating interface using a PC with DIGSI
station via the system interface.
7SA522 integrates the calculated power which is then made available with the mea-
sured values. The components as listed in table 2-16 can be read out. The signs of the
operating values depend on the setting at address  34 VLJQ (see Subsection
2.21.3 at margin heading "Display of Measured Values").
Please take into consideration that 7SA522 is, above all, a protection device. The ac-
curacy of the measured values depends on the current transformer (normally protec-
tion core) and the tolerances of the device. The metering is therefore not suited for
tariff purposes.
The counters can be reset to zero or any initial value (see SIPROTEC
scription, Order No. E50417-H1176-C151).
Table 2-16 Operational metered values
Measured Values
W
p+
W –
p
W +
q
W –
q
®
The SIPROTEC 4 System Description describes how to read out the statistical
counters via the device front panel or DIGSI
the protected object. Provided the direction was set to "forward" (address ).
Type of In-
formation
IntSP_Ev
PMV
PMV
PMV
PMV
-
-
MVMV
®
, or transferred to a central operational
Real power, output
Real power, input
Reactive power, output
Reactive power, input
®
. The values are added up in direction of
Reset meter
Pulsed Energy Wp (active)
Pulsed Energy Wp (active)
Pulsed Energy Wq (reactive)
Pulsed Energy Wq (reactive)
Increment of active energy
Increment of reactive energy
Wp Forward
®
4 System De-
primary
kWh, MWh, GWh
kWh, MWh, GWh
kVARh, MVARh, GVARh
kVARh, MVARh, GVARh
Comments
7SA522 Manual
C53000-G1176-C155-3