Stub Protection Stbptoc (50Stb); Identification - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
Protection
operate time
The fault
occurs
ANSI05000479 V3 EN-US
Figure 81: Time sequence
t3 : Additional time delay to t2 for a second back-up trip TRBU2. In some applications there might
be a requirement to have separated back-up trip functions, tripping different back-up circuit
breakers.
tCBAlarm : Time delay for alarm in case of indication of faulty circuit breaker. There is a binary
input 52FAIL from the circuit breaker. This signal is activated when internal supervision in the
circuit breaker detect that the circuit breaker is unable to clear fault. This could be the case when
gas pressure is low in a SF6 circuit breaker, of others. After the set time an alarm is given, so that
actions can be done to repair the circuit breaker. The time delay for back-up trip is bypassed when
the 52FAIL is active. Typical setting is 2.0 seconds.
tPulse : Trip pulse duration. This setting must be larger than the critical impulse time of circuit
breakers to be tripped from the breaker failure protection. Typical setting is 200 ms.
7.11

Stub protection STBPTOC (50STB)

7.11.1

Identification

Function description
Stub protection
Application manual
Normal t
cbopen
Retrip delay t1 t
cbopen
Minimum back-up trip delay t2
Critical fault clearance time for stability
Trip and Pickup
CCRBRF
(50BF)
after re-trip
t
BFPreset
Margin
IEC 61850 IEC 60617
identification identification
STBPTOC
3I>STUB
SYMBOL-T V1 EN-US
Current protection
Time
ANSI05000479_3_en.vsd
ANSI/IEEE C37.2
device number
50STB
Section 7
IP14515-1 v3
M17108-1 v2
175