Energy; Energy Metering; Setting Notes; Information List - Siemens SIPROTEC Manual

Line differential protection with distance protection

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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.

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).

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).

SIPROTEC, 7SD5, Manual

C53000-G1176-C169-5, Release date 02.2011

Operational metered values

Measured values

Active power, output

Active power, input

Reactive power, output

Reactive power, input

kWh, MWh, GWh

kVARh, MVARh, GVARh

Pulsed Energy Wp (active)

Pulsed Energy Wq (reactive)

Increment of active energy

Increment of reactive energy

2.26 Additional Functions