EFP Basics
Transcript of EFP Basics
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Technology and SolutionsProtection and Substation Automation
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Topic:
END FAULTPROTECTIONAPPLICATION
BASICS BASICS
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WTopic Objectives
r Definition Protection Zone - Physical Zone
r Definition End- Fault Conditionr Fault clearance without EFP
r Fault evaluation
r EFP applicationr Fault clearance with EFP
r End- Fault Condition in a bus- coupler
r CB auxiliary circuitsr Modern protection systems
r BBP - additional CB functionality on feedersr Future standards
Objectives
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1 CT
Definition Protection Zone - Physical Zone
2 CTs (overlapped protection zones)
busbar zone
(physical)
line zone
(physical)
protection zone
protection zone
protection zone
protection zone
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WDefinition End- Fault Condition
1 CT
2 CTs (overlapped protection zones)
End - Zone
End - Zone
End - Fault
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WBusbar Configurations
CT line side
CT bus side
CT overlapped
Selectivity
Speed
Selectivity
Speed
single or multiple busbar
1 1/2 breaker busbar
How will an End- Fault condition be cleared in different busbar
configurations (without any End-Fault Protection) ???
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Bus
bar
Fault clearance (without EFP)
I. Multiple BB, CT line side
G
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Line
G
Fault clearance (without EFP)
I. Multiple BB, CT line side
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Bus
bar
Line
G
Fault clearance (without EFP)
II. Multiple BB, CT bus side
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OC Back- up
Line
Dis
tanc
e
G
Fault clearance (without EFP)
II. Multiple BB, CT bus side
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Bus
bar
Line
G
Fault clearance (without EFP)
III. Multiple BB, CT overlapped
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G
Fault clearance (without EFP)
III. Multiple BB, CT overlapped
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Line Distance
OC Back- up
OC Back- up
Fault clearance (without EFP)
IV. 1 1/2 CB BB, CT line side
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OC Back- up
OC Back- up
Fault clearance (without EFP)
V. 1 1/2 CB BB, CT bus side
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WFault clearance (without EFP)
VI. 1 1/2 CB BB, CT overlapped
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CT line side
CT bus side
CT overlapped
single or multiple busbar
1 1/2 breaker busbar
Fault Evaluation
++ very good
+ acceptable
- critical
Selectivity
Selectivity
Speed
Speed
++
++++
++
++
+ -
---
-
-
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WFault Evaluation
Conclusion:
An additional protection function is required in CT bus side and 1 1/2 circuit
breaker configuration without overlapped CTs
!!!
ð End- Fault Protection Function
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logic depending on the switchgear configuration (CT bus side, Line side;
1 1/2 CB)
feeder current
End- Fault Protection Function
EFP
&
I >
remote tripping
intertripping
t = EFP pick up time (higher than the highest possible arc extinguish time + safety time
CB opent
~120 ms
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WFault clearance (with EFP)
How will an End- Fault condition be cleared in
different busbar configurations (with End- Fault Protection)
???
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Bus
bar
Line
G
Fault clearance (with EFP)
II. Multiple BB, CT bus side
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G
Fault clearance (with EFP)
II. Multiple BB, CT bus side
EFP
Intertripping
ð Fault cleared selectively !!!(~250ms)
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WFault clearance (with EFP)
IV. 1 1/2 CB BB, CT line side
EFPIntertripping
Remote trip
ð Fault cleared selectively !!!(~250ms)
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WFault clearance (with EFP)
V. 1 1/2 CB BB, CT bus side
EFP
ð Fault cleared selectively !!!(~250ms)
Intertripping
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How will an End- Fault condition be cleared in a bus- coupler (without any
EFP)
???
End- Fault Condition in a Bus- Coupler
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BB1
BB2
End- Fault Condition in a Bus- Coupler
~ ~
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WEnd- Fault Condition in a Bus- Coupler
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⇒ by the coupler function of the
BUSBAR protection
End- Fault Condition in a Bus- Coupler
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r a bus- coupler
End Fault Protection application
r multiple BB configuration with CT bus sider 1 1/2 circuit breaker configuration without
overlapped CTs
Summery:An EFP function in strictly required in:
It is not required in:r configuration with overlapped CTs
It will reduce the tripping time in:r multiple BB configuration with CT line side
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WCB auxiliary circuits
What “problem” will occur in case on a “switch
onto fault” situation???
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WCB auxiliary circuits
CB open !!!
CB closing command
flash over before CB indicates closed
⇒ EFP will trip the BB wrongly
EFP enabled
I>
CT bus side
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WCB auxiliary circuits
CB open !!!
CB closing command
flash over before CB indicates closed
⇒ EFP will trip the line remote end wrongly
EFP enabled
I>
CT line side
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⇒ in case on a “switch onto fault situation” the EFP will generate a tripping signal before the closed indication appears
(flash- over in the circuit breaker)
CB auxiliary circuits
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WCB auxiliary circuits
How can this be avoided???
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⇒ the protection system must be informed in advance that the CB is going to be closed
⇒ by the (manual) close command of the CB
CB auxiliary circuits
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logic depending on the switchgear configuration (CT bus side, Line side;
1 1/2 CB)
feeder current
End- Fault Protection Function
EFP
&I >
remote tripping
intertripping
t = EFP pick up time (higher than the highest possible arc extinguish time + safety time
CB opent
~120 ms
CB (manual)
close command
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Phase
R S T
CB / isolator auxiliary circuits
CB open
CB closed
++
protection
system
NC aux.
contacts
Phase
R
S
T
NC aux.
contacts
+
CB closing
coil
CB (manual)
close commandCB close
order
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WModern Protection Systems
The Busbar Protection and End Fault Protection Function could be
combined in one modern protection systems (e.g. REB500 / REB500sys)
How is it possible to reach additional SELECTIVITY in a CT line side configuration at an End- Fault
condition with an already OPEN CB
???
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Bus
bar
CT line side configuration
G
Modern Protection Systems
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⇒ by deactivating of the busbar protection function
current measurement in case of an open CB(only applicable in a
CT line side configuration)
Modern Protection Systems
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WBusbar Protection - additional CB functionality
⇒ BBP will not trip because the current will not be measured
CB open !!!
EFP enabledcurrent not measured in the BBP !!!
⇒ EFP will trip the remote end
for B
BP
only
app
licab
le in
a
CT
line
side
con
figur
atio
n
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What is very important if such a additional CB functionality is used
???
Busbar Protection - additional CB functionality
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⇒ the (manual) close command of the CB has to be installed / commissioned absolutely correctly
Busbar Protection - additional CB functionality
⇒ if not, there is a high risk of maloperation of the BUSBAR PROTECTION in case of switch onto fault condition !!!
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WSwitch onto Fault with missing CB close command⇒ BBP will trip wrongly because the out-flowing current is not measured
CB open !!!
EFP enabledcurrent not measured in the BBP !!!
⇒ EFP will trip wrongly because the current is measured and the CB indicates open
CB closing command
flash over before CB indicates closed
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