2 Functions
360
7SA522 Manual
C53000-G1176-C155-3
2.21.7 Energy
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
®
, or transferred to a central operational
station via the system interface.
2.21.7.1 Power Metering
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 34VLJQ (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
®
4 System De-
scription, Order No. E50417-H1176-C151).
Table 2-16 Operational metered values
2.21.7.2 Setting Notes
Retrieving Parame-
ters
The SIPROTEC
®
4 System Description describes how to read out the statistical
counters via the device front panel or DIGSI
®
. The values are added up in direction of
the protected object. Provided the direction was set to “forward” (address ).
2.21.7.3 Information List
Measured Values primary
W
p+
Real power, output kWh, MWh, GWh
W
p
– Real power, input kWh, MWh, GWh
W
q
+ Reactive power, output kVARh, MVARh, GVARh
W
q
– Reactive power, input kVARh, MVARh, GVARh
No. Information Type of In-
formation
Comments
- Meter res IntSP_Ev Reset meter
888 Wp(puls) PMV Pulsed Energy Wp (active)
888 Wp(puls) PMV Pulsed Energy Wp (active)
889 Wq(puls) PMV Pulsed Energy Wq (reactive)
889 Wq(puls) PMV Pulsed Energy Wq (reactive)
916 Wp∆= - Increment of active energy
917 Wq∆= - Increment of reactive energy
924 Wp+= MVMV Wp Forward
To Next Page
Loading...
Need help?
General
