P50 Agile P253
6 Protection Functions
P253/EN M/C
6-25
2.11.2
Circuit Breaker Fail Logic
CB Fail Enable
If in1 is less than
In1<
Ext CBF Initiated
Any Trip
If I in all Phase is
less than I<
52(B)
Protection Reset
1
S
Q
RD
&
&
&
CBF Timer
&
CBF Reset
Figure 11: CB Fail Logic
CBF elements
CB Fail Timer
can be configured to operate for trips triggered by protection elements
within the device or via an external protection trip. The latter is achieved by allocating one of the opto-
isolated inputs to CBF Init signal using the I/O Mask feature.
It is possible to reset the CBF from a breaker open indication from a protection reset. In these cases
resetting is only allowed provided the undercurrent elements have also been reset. The resetting
options are summarised in the following table:
CBF function Reset options
Description
I<
CBF function will reset when the phase currents and earth current is less than
set current
CB Open + I<
CBF function will reset when both conditions are satisfied:
•
CB is open (i.e. CB(52B) status is active)
•
The phase currents and earth current is less than set current
Prot Reset + I<
CBF function will reset when both conditions are satisfied:
•
Protection is reset
•
Phase currents and earth current is less than set current
CB Open
CBF function will reset when CB is open (i.e. CB(52B) status is active)
The
Remove I> Start
and
Remove IN>
Start settings are used to remove starts issued from the
overcurrent and earth elements respectively following a breaker fail time out. The start is removed
when the cell is set to 'Enabled'
.
Summary of Contents for P50 Agile P253
Page 3: ...P50 Agile P253 1 Introduction P253 EN M C 1 1 INTRODUCTION CHAPTER 1 ...
Page 4: ...1 Introduction P50 Agile P253 1 2 P253 EN M C ...
Page 11: ...SAFETY INFORMATION CHAPTER 2 ...
Page 12: ...Safety Information Pxxx 2 ...
Page 23: ...P50 Agile P253 3 Hardware Design P253 EN M C 3 1 HARDWARE DESIGN CHAPTER 3 ...
Page 24: ...3 Hardware Design P50 Agile P253253 3 2 P253 EN M C ...
Page 28: ...3 Hardware Design P50 Agile P253253 3 6 P253 EN M C E00276 Figure 2 Hardware design overview ...
Page 32: ...3 Hardware Design P50 Agile P253253 3 10 P253 EN M C ...
Page 33: ...P50 Agile P253 4 Front Panel P253 EN M C 4 1 FRONT PANEL CHAPTER 4 ...
Page 34: ...4 Front Panel P50 Agile P253 4 2 P253 EN M C ...
Page 39: ...P50 Agile P253 4 Front Panel P253 EN M C 4 7 Figure 2 USB port ...
Page 40: ...4 Front Panel P50 Agile P253 4 8 P253 EN M C ...
Page 41: ...P50 Agile P253 5 Configuration P253 EN M C 5 1 CONFIGURATION CHAPTER 5 ...
Page 42: ...5 Configuration P50 Agile P253 5 2 P253 EN M C ...
Page 154: ...5 Configuration P50 Agile P253 5 114 P253 EN M C ...
Page 155: ...P50 Agile P253 6 Protection Functions P253 EN M C 6 1 PROTECTION FUNCTIONS CHAPTER 6 ...
Page 156: ...6 Protection Functions P50 Agile P253 6 2 P253 EN M C ...
Page 182: ...7 Protection Parameter Settings P50 Agile P253 7 2 P253 EN M C ...
Page 203: ...P50 Agile P253 8 Monitoring Control P253 EN M C 8 1 MONITORING CONTROL CHAPTER 8 ...
Page 204: ...8 Monitoring Control P50 Agile P253 8 2 P253 EN M C ...
Page 222: ...8 Monitoring Control P50 Agile P253 8 20 P253 EN M C ...
Page 223: ...P50 Agile P253 9 SCADA Communications P253 EN M C 9 1 SCADA COMMUNICATIONS CHAPTER 9 ...
Page 224: ...9 SCADA Communications P50 Agile P253 9 2 P253 EN M C ...
Page 249: ...P50 Agile P253 10 Installation P253 EN M C 10 1 INSTALLATION CHAPTER 10 ...
Page 250: ...10 Installation P50 Agile P253 10 2 P253 EN M C ...
Page 260: ...11 Commissioning Instructions P50 Agile P253 11 2 P253 EN M C ...
Page 270: ...11 Commissioning Instructions P50 Agile P253 11 12 P253 EN M C ...
Page 272: ...12 Maintenance and Troubleshooting P50 Agile P253 12 2 P253 EN M C ...
Page 282: ...13 Technical Specifications P50 Agile P253 13 2 P253 EN M C ...
Page 292: ...13 Technical Specifications P50 Agile P253 13 12 P253 EN M C ...
Page 293: ...P50 Agile P253 14 Wiring Diagrams P253 EN M C 14 1 WIRING DIAGRAMS CHAPTER 14 ...
Page 294: ...14 Wiring Diagrams P50 Agile P253 14 2 P253 EN M C ...
Page 297: ......