Current Protection; Directional Phase Overcurrent Protection, Four Steps Oc4Ptoc (51_67); Function Revision History; Identification - Hitachi Relion 670 Series Applications Manual

1MRK511407-UUS Rev. N
Section 8
8.1 Directional phase overcurrent protection, four steps
OC4PTOC (51_67)
8.1.1

Function revision history

Document
revision
A
B
C
D
E
F
G
H
J
K
M
N
8.1.2

Identification

Function description
Directional phase overcurrent
protection, four steps
8.1.3

Application

Directional phase overcurrent protection, four steps OC4PTOC (51_67) is used in several applications in
the power system. Some applications are:
Phasor measurement unit RES670
Application manual

Current protection

Product History
revision
2.2.1 -
2.2.1 -
2.2.2 -
2.2.3 -
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 -
2.2.4 -
2.2.5 • The harmonic restraint function changed to freeze the definite and IDMT timers.
• The maximum value of the settings IMin1, IMin2, IMin3 and IMin4 has been decreased
to 1000.0 % of IBase.
2.2.6 -
2.2.6 Minimum value changed to 0.01 for k1,k2,k3 and k4 settings
IEC 61850
identification
OC4PTOC
© 2017 - 2023 Hitachi Energy. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
51_67
TOC-REVA V2 EN-US
Section 8
Current protection
SEMOD129998-1 v8
GUID-154CAE8E-8FD4-460C-852D-6E5C93545F0D v2
M14885-1 v6
M15335-3 v9
109