Siemens SIPROTEC 7UT613 series Manual page 392

3 Mounting and Commissioning
Flexible Functions
Current Functions
392
3-phase k = 1
VG
= √3/2
2-phase k
VG
= √3
1-phase k
VG
While the protection, supervision and measuring functions implemented in the device
and part of the device firmware are "fixed", the flexible functions are individually con-
figured (see Section 2.1.4 under margin heading „Flexible Functions"). Configuration
testing is best performed using secondary testing, as the internal connections have to
be checked. Verification of the system connections is contained in a later primary com-
missioning (Section 3.3 under „Circuit Breaker Failure Protection Tests").
In these secondary testings mainly the correct assignments of flexible function to the
analogue measured inputs are verified, as well as to the binary in/outputs.
Every flexible function is individually checked, as each was individually configured.
For flexible functions with Current Input test currents are fed into the current input, i.e.
one after the other, those that are relevant to the tested flexible functions. For functions
working on exceeding currents a slowly increased test current is applied until the func-
tion trips. Value undershooting above a pickup value it is decreased. Keep in mind that
the corresponding message can be delayed if a time delay is set.
Caution!
Tests with currents that exceed more than 4 times the rated device current cause an
overload of the input circuits and may only be performed for a short time.
See Technical Data
Afterwards the device has to cool off!
When checking pickup values keep in mind:
• If the current function is assigned to one side of the main protective object, the
pickup values are referred to the rated current (I/I
ed. The rated current of the side can be determined analogue to the equations
above under :Differential Protection". The test current has to be converted to sec-
ondary value.
• If the current function is assigned to a measured location and the pickup values are
set secondary, the pickup value equals the secondary setting value.
). Magnitude factors are includ-
N S
7UT613/63x Manual
C53000-G1176-C160-2