I m in
M A X I
fA
I
fB
I
M
,
,
(
)
³
EQUATION287 V1 EN-US
(Equation 481)
Where:
I
fA
and I
fB
have been described for the single line case.
Considering the safety margins mentioned previously, the minimum setting (Is) is:
I
s
= 1.3 ×
I
min
EQUATION288 V3 EN-US
(Equation 482)
Transformer inrush current shall be considered.
The setting of the protection is set as a percentage of the base current (
IBase).
Operation: set the protection to On or Off.
IN>>: Set operate current in % of IBase.
StValMult: The operate current can be changed by activation of the binary input ENMULT to
the set factor
StValMult.
8.4
Four step residual overcurrent protection, (Zero
sequence or negative sequence directionality)
EF4PTOC
IP14509-1 v6
8.4.1
Identification
M14881-1 v5
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Four step residual overcurrent
protection
EF4PTOC
4(IN>)
4
alt
4
TEF-REVA V2 EN-US
51N_67N
8.4.2
Application
M12509-12 v9
The four step residual overcurrent protection EF4PTOC is used in several applications in the
power system. Some applications are:
•
Earth-fault protection of feeders in effectively earthed distribution and subtransmission
systems. Normally these feeders have radial structure.
•
Back-up earth-fault protection of transmission lines.
•
Sensitive earth-fault protection of transmission lines. EF4PTOC can have better sensitivity
to detect resistive phase-to-earth-faults compared to distance protection.
•
Back-up earth-fault protection of power transformers.
•
Earth-fault protection of different kinds of equipment connected to the power system
such as shunt capacitor banks, shunt reactors and others.
1MRK 505 343-UEN B
Section 8
Current protection
417
Application manual
Содержание Relion 670 series
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