4 SENSITIVE POWER PROTECTION
In some applications, it is necessary to have very high accuracy when applying power protection. For such
applications it is possible to use metering class CTs and separate Sensitiv
e Power elements.
The Sensitive Power protection is a single-phase power element using phase A current and voltage. It provides two
independent stages of Low Forward Power, Reverse Power and Over Power protection with timer and pole-dead
blocking.
Note:
Sensitive Power Protection is only available for models equipped with a SEF transformer.
4.1 SENSITIVE POWER PROTECTION IMPLEMENTATION
Sensitive Power Protection is implemented in the PO
WER PROTECTION column of the relevant settings group,
under the sub-heading SENSITIVE POWER. It is a single phase power element using the A-phase voltage and
sensitive current ISEF.
There are two stages of Sensitive Power protection, which can be independently selected as Low Forward Power,
Reverse Power and Overpower.
Note:
When the sensitive power function is used, the SEF CT must be connected to Phase A current, making the measured power
ISEF x VA.
4.2 SENSITIVE POWER MEASUREMENTS
Three sensitive power related measurements are added to the Measurements column, the visibility of which will
depend on the protection configuration.
● A-Phase Sensitive Active Power in Watts (APh Sen Watts)
● A-Phase Sensitive Re-active Power in VArs (APh Sen VARs)
● A-Phase Sensitive Power Angle (APh Power Angle)
Chapter 12 - Power Protection Functions P14x
266 P14xEd1-TM-EN-1
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