Functions
2.26 Additional Functions
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
485
2.26.11 Energy
Metered values for active and reactive power are determined in the background by the processor system. They
can be called up at the front of the device, read out via the operating interface using a PC with DIGSI, or trans-
ferred to a central master station via the system interface.
2.26.11.1Energy Metering
7SD5 integrates the calculated power which is then made available with the measured values. The compo-
nents as listed in table 2-24 can be read out. The signs of the operating values depend on the setting at address
1107 P,Q sign (see Section 2.26.4 under margin heading „Display of Measured Values“).
It is important to remember that 7SD5 is, above all, a protection device. The accuracy of the metered values
depends on the instrument transformers (normally protection core) and the device tolerances. The metering is
therefore not suited for tariff purposes.
The counters can be reset to zero or any initial value (see also SIPROTEC 4 System Description).
Table 2-24 Operational metered values
2.26.11.2Setting Notes
Retrieving parameters
The SIPROTEC System Description describes in detail 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 as „forward“ (address 201).
2.26.11.3Information List
Measured values Primary
W
p
+ Active power, output kWh, MWh, GWh
W
p
– Active 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)
889 Wq(puls) PMV Pulsed Energy Wq (reactive)
916 WpΔ= - Increment of active energy
917 WqΔ= - Increment of reactive energy
924 Wp+= MVMV Wp Forward
925 Wq+= MVMV Wq Forward
928 Wp-= MVMV Wp Reverse
929 Wq-= MVMV Wq Reverse
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