IEC05000749 V1 EN-US
Figure 61: Current voltage characteristics for the non-linear resistors, in the range 10-200 V, the average
range of current is: 0.01–10 mA
7.3 Low impedance restricted earth fault protection
REFPDIF (87N)
IP14640-1 v6
7.3.1 Identification
M14843-1 v6
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Restricted earth fault protection, low
impedance
REFPDIF
SYMBOL-AA V1 EN-US
87N
7.3.2 Application
IP14941-1 v1
M13940-3 v12
A breakdown of the insulation between a transformer winding and the core or the tank
may result in a large fault current which causes severe damage to the windings and the
transformer core. A high gas pressure may develop, damaging the transformer tank.
Section 7 1MRK 504 163-UUS A
Differential protection
176 Transformer protection RET670 2.2 ANSI
Application manual
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