Functional Test for Overexcitation Protection
Secondary Test
NOTE
While performing the secondary test, ensure that the data of the protected object refer to the protection
function.
This means that a mismatch between the voltage transformer and the protected object will be corrected auto-
matically. For instance, when applying the secondary rated voltage and the rated frequency, this must not
result in a V/f value of 1.
The mismatch of the voltage transformer must be taken into consideration when selecting the test voltage.
Multiply the secondary test voltage with the following 'k' factor.
[fokfakuf-070513-01.tif, 1, en_US]
Example
V
rated,obj
= 110 kV; V
rated, transf.
= 100 kV
It follows from the above that k = 1.1. For example, when verifying the nominal conditions if the secondary
rated voltage is 100 V, a voltage of 1.1 * 100 V = 110 V must be supplied. The measured value of the function
Measured value V/f must display 1.0000.
NOTE
When checking the dependent stage, ensure it is associated with a thermal replica. When repeating a test,
always reset the replica, using the binary input indication >Reset therm. replica(_:13951:501).
Primary Test
The plausibility check between instantaneous overexcitation and the displayed operational measured value is
used to verify the functionality of overexcitation.
Instantaneous overexcitation is a result of the following function:
[fomoweuf-070513-01.tif, 1, en_US]
where:
V
Instantaneous voltage
V
rated
Primary rated voltage of the protected object
f Instantaneous frequency in f
f
rated
Rated frequency
11.16
Functional Tests
11.16 Functional Test for Overexcitation Protection
SIPROTEC 5, Overcurrent Protection, Manual 1401
C53000-G5040-C017-8, Edition 07.2017
To Next Page
Loading...
