ABB REL650 - Four Step Phase Overcurrent Protection Phase Segregated Output OC4 SPTOC 51_67

40 100 40 40 220t ms ms ms ms msD ³ + + + =
EQUATION1266 V1 EN (Equation 110)
where it is considered that:
the operate time of overcurrent protection B1 is 40 ms
the breaker open time is 100 ms
the resetting time of protection A1 is 40 ms and
the additional margin is 40 ms
7.4 Four step phase overcurrent protection phase
segregated output OC4SPTOC 51_67
7.4.1 Identification
Function description IEC 61850 identification IEC 60617 identification ANSI/IEEE C37.2 device
number
Four step phase
overcurrent protection,
phase segregated
output
OC4SPTOC
ID-2147.VSD V1 EN
51/67
7.4.2 Application
The four step phase overcurrent protection phase segregated output OC4SPTOC (51_67)
is used in several applications in the power system. Some applications are:
• Short circuit protection of feeders in distribution and subtransmission systems.
Normally these feeders have radial structure.
• Back-up short circuit protection of transmission lines.
• Back-up short circuit protection of power transformers.
• Short circuit protection of different kinds of equipment connected to the power
system such as; shunt capacitor banks, shunt reactors, motors and others.
• Back-up short circuit protection of power generators.
1MRK 506 334-UUS A Section 7
Current protection
189
Application manual