Example Of Required Settings (E.g. Hv Cb) - Siemens 7SR242 Duobias Technical Manual

Relay
Operation
and CBF
Timer
Started
System
Fault
Main
CB's
Trip
Fails to
Relay
Trip
Operation
40 60
CB Operate Time
Stage 1 CBF Timer (Retrip) = 120ms

Example of Required Settings (e.g. HV CB)

FUNCTION CONFIG>
Gn CB Fail
SUPERVISION > CB FAIL > 50BF-1
Gn 50BF-1 Element
Gn 50BF-1 Setting
Gn 50BF-1-1 Delay
Gn 50BF-1-2 Delay
INPUT CONFIG>INPUT MATRIX>
50BF-1 Ext Trip
OUTPUT CONFIG>OUTPUT MATRIX>
50BF-1-1
50BF-1-2
OUTPUT CONFIG>BINARY OUTPUT CONFIG>
CB1 Trip Contacts
The above based on:
First Stage Backtrip (or Re-trip)
Trip Relay operate time
CB Tripping time
DUOBIAS-M Reset Time
Safety Margin
Overall First Stage CBF Time Delay
Second Stage (Back Trip)
First CBF Time Delay
Trip Relay operate time
DUOBIAS-M Reset Time
CB Tripping time
Margin
Overall Second Stage CBF Time Delay
©2015 Siemens Protection Devices Limited
CBF Retrip
Trip Relay
No Reset of
CBF Retrip
CBF elements
Operation
80 100 120 140 160
Stage 2 CBF Timer (Backtrip) = 250ms
Figure 5-3 - Two Stage Circuit Breaker Fail Timing
Enabled
Enabled
0.2 x In
120ms
250ms
BIn
BOn, Ln
BOn, Ln
BOn
Typical Times
10ms
50ms
30ms
30ms
120ms
120ms
10ms
30ms
50ms
50ms
260ms
No Reset of
CBF elements
CBF Back trip
Failed CB Retrip
Operation
Operation
180 200 220 240 260
Backtrip
Operation of all
Trip Relay
BB CB's
Operation
Reset of
CBF elements
280 300 320 340 360
Chapter 7 Page 46 of 64
ms from fault
occuring