4.2.3.10 Technical revision history
Table 315: INTRPTEF Technical revision history
Technical revision Change
B Minimum and default values changed to 40 ms
for the
Operate delay time
setting
C The
Minimum operate current
setting is added.
Correction in IEC61850 mapping: DO BlkEF
renamed to InhEF. Minimum value changed from
0.01 to 0.10 (default changed from 0.01 to 0.20)
for the
Voltage start value
setting. Minimum
value changed from 0 ms to 40 ms for the
Reset
delay time
setting.
4.2.4 Admittance-based earth-fault protection EFPADM
4.2.4.1 Identification
Functional description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Admittance-based earth-fault protection EFPADM Yo>-> 21YN
4.2.4.2 Function block
GUID-70A9F388-3588-4550-A291-CB0E74E95F6E V1 EN
Figure 155: Function block
4.2.4.3 Functionality
The admittance-based earth-fault protection function EFPADM provides a
selective earth-fault protection function for high-resistance earthed, unearthed and
compensated networks. It can be applied for the protection of overhead lines as
well as with underground cables. It can be used as an alternative solution to
traditional residual current-based earth-fault protection functions, such as the IoCos
mode in DEFxPDEF. Main advantages of EFPADM include a versatile
applicability, good sensitivity and easy setting principles.
EFPADM is based on evaluating the neutral admittance of the network, that is, the
quotient:
1YHT530004D05 D Section 4
Protection functions
615 series 311
Technical Manual
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