Four Step Phase Overcurrent Protection Phase Segregated Output Oc4Sptoc 51_67 - ABB REL650 Applications Manual

1MRK 506 334-UUS A
7.4
7.4.1
7.4.2
Application manual
D ³ + +
t 40 ms 100 ms
EQUATION1266 V1 EN
where it is considered that:
the operate time of overcurrent protection B1 is 40 ms
the breaker open time
the resetting time of protection A1
the additional margin
Four step phase overcurrent protection phase
segregated output OC4SPTOC 51_67
Identification
Function description IEC 61850 identification
Four step phase OC4SPTOC
overcurrent protection,
phase segregated
output
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.
+ =
40 ms 40 ms 220 ms
is 100 ms
is 40 ms and
is 40 ms
IEC 60617 identification
ID-2147.VSD V1 EN
Section 7
Current protection
(Equation 110)
ANSI/IEEE C37.2 device
number
51/67
189