Rated voltage (high-voltage winding) U
Nom
= 25 kV
Current Transformer 1500 A/1 A
The following applies to the high voltage winding:
[oberspannungswicklung-intrafo, 1, en_GB]
In this case the rated current of the winding is practically equal to the current transformer rated current. Thus,
the pickup value (referred to the rated relay current) complies with the setting value I-DIFF> of the device
(k
VG
= 1 for reference winding). For single-phase testing with zero sequence current elimination, a pickup
value 1.5 times higher must be expected.
The following applies to the low voltage winding:
[unterspannungswicklung-intrafo, 1, en_GB]
When testing this winding, the pickup value (referred to the rated device current) will amount to
[sekundaerpruefung-ansprechwert-iansprech, 1, en_GB]
Because of the odd vector group numeral, the following pickup values apply (Table 3-31)
3-phase
k
VG
= 1
[ansprechwert-3ph, 1, en_GB]
2-phase k
VG
= √3/2
[ansprechwert-2ph, 1, en_GB]
1-phase k
VG
= √3
[ansprechwert-1ph, 1, en_GB]
Flexible Functions
While the protection, supervision and measuring functions implemented in the device and part of the device
firmware are “fixed”, the flexible functions are individually configured (see Section 2.1.4 Power System Data 1
under margin heading “Flexible Functions”). Configuration testing is best performed using secondary testing,
Mounting and Commissioning
3.3 Commissioning
SIPROTEC 4, 7UT6x, Manual 367
C53000-G1176-C230-5, Edition 09.2016
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