Table 3:
Backup protection example data
Station
Tap transformer 10 MVA
Type of fault
Three phase fault
Object
1 = 10 kV Line A
2 = T1 10 kV 50/51
3 = 130 kV 87L
(ImaxAddDelay)
Setting
2 MVA
14 MVA
20 MVA
Characteristic
IEC Extr.inverse, k=0.5,
A=80, p=2
IEC Norm.inverse k=0.12,
A=0.14, p=0.02
IEC Norm.inverse k=0.18,
A=0.14, p=0.02
High set stage
14 MVA
- - - -
- - - -
It is important to achieve a proper back-up protection. The short circuit protection on the
outgoing bays and on the LV side of the transformer are set according to a prepared
selectivity chart. An example in Figure
shows that the setting of the short circuit protection
on the LV side is 14 MVA, and Normal Inverse has k=0.12 to give back-up to outgoing bays'
relays which are extremely inverse and selective to remote fuses.
IEC14000047 -1-en.ai
IEC14000047 V1 EN-US
Figure 38: Selectivity chart
Section 4
1MRK 505 382-UEN E
Analog and binary signal transfer for line differential protection
38
Communication set-up, 670/650 series
Application Guide
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Summary of Contents for Relion 670 series
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