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Neptune Power Versions compared 3 All rights reserved © 2003, Neptune Concept of operations Design continues to be refined Simple reliable operation is key Voltage is used as a signal to the autonomous BU control
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Neptune Power Versions compared 1 All rights reserved © 2003, Neptune
Power sub-system Versions 1 and 2
Key features
• V2 is functionally equivalent to V1 in safe mode (mostly)• Operation of the delivery system is autonomous• Several modes of operation are identified
– Normal– Node Connecting – Fault Clearing– Fault Locating
• Operation in these modes is not SOP for a power system!• The existence of these modes enables component stress to be
reduced during system operation
Neptune Power Versions compared 2 All rights reserved © 2003, Neptune
Version 2 physical location options
• Power sub unit can be in the BU or Node
10A circuit
1A circuit
BU BU Science
Node Pressure-
Cases
1A circuit
10A circuit
10A circuit
10A circuit
Neptune Power Versions compared 3 All rights reserved © 2003, Neptune
Concept of operations
• Design continues to be refined• Simple reliable operation is key• Voltage is used as a signal to the autonomous BU control
Neptune Power Versions compared 4 All rights reserved © 2003, Neptune
Concept of operations
Voltage Mode m(Meaning)
Operation to be performed
+500* Fault location Close all BB breakers Disconnect all science nodes
- 500* Fault clearing Open breaker closest to fault
-1000 Connect Science Node
Measure resistance of spur cable to science node: close switch if good
-5000 (or more)
Normal Internal monitoring only: No switch operations at full voltage
Appropriate sequencing gives unambiguous operation
* These mean current-limit operation at the shore station
Neptune Power Versions compared 5 All rights reserved © 2003, Neptune
Concept of operations
Un-powered +500V
Fault Locating Mode, + 500 V
• Initial switch state is unknown• Shore station is in current limit
operation• Regardless of whether a fault is
present– Positive voltage is sensed– Backbone breaker is closed– Science node connection is
opened• If there is a fault, its location is
measured from shore
• Return to unpowered state after fault location determined
Neptune Power Versions compared 6 All rights reserved © 2003, Neptune
Concept of operations
Un-powered
-500V
Fault Clearing Mode, -500V• Initial BB switch state is closed• Shore station is in current-limit
operation• If a fault is present
– Time-coordinated protection begins when current becomes non-zero
– Unit closest to fault trips first• If no fault is present
– Backbone breakers remain closed
• In either case, status is stored
Neptune Power Versions compared 7 All rights reserved © 2003, Neptune
Concept of operations
- 500V -1000V
Science Connecting Mode, -1000 V• Initial science node switch state
is open• Shore station is constant
voltage operation• Spur cable resistance is
measured at low current– If no fault detected, spur
switch closes– If fault detected, spur
switch stays open• In either case, status is stored
Neptune Power Versions compared 8 All rights reserved © 2003, Neptune
Concept of operations
-1000V -10kV
Normal Mode, -6000 V to – 10,000 V• The control knows what the
switch status is • The control knows that is is in
the Normal Mode• If a fault occurs during Normal
Mode operation– No switch action results– Shore station enters
current limit mode
Neptune Power Versions compared 9 All rights reserved © 2003, Neptune
Concept of operations
Un-powered
-10kV
Controlled shutdown from normal mode
• Shore station shuts the system down
• There is no change in the state of any switch
• The location of faults, if any, is not known to the shore station
• If the shutdown is not because of a fault, the fault location step can be omitted
Neptune Power Versions compared 10 All rights reserved © 2003, Neptune
Circuit description
• Simplified circuit, un-powered
ControlControl
To Science
0V
Neptune Power Versions compared 11 All rights reserved © 2003, Neptune
Circuit description • Fault Location mode • Power Feed output to +500V
ControlControl
To Science
+500V
Neptune Power Versions compared 12 All rights reserved © 2003, Neptune
Circuit description
ControlControl
To Science
+500V
• Fault Location mode • Start up supply charges
Neptune Power Versions compared 13 All rights reserved © 2003, Neptune
Circuit description • Fault Location mode • Next cable section connected
ControlControl
To Science
+500V
Neptune Power Versions compared 14 All rights reserved © 2003, Neptune
Circuit description • Fault Location mode • Second start up supply
charges
ControlControl
To Science
+500V
Neptune Power Versions compared 15 All rights reserved © 2003, Neptune
Circuit description • Fault Location mode • Second relay closes
ControlControl
To Science
+500V
Neptune Power Versions compared 16 All rights reserved © 2003, Neptune
Circuit description • Fault Location mode • Zeners power control if fault
ControlControl
I+500
V
Neptune Power Versions compared 17 All rights reserved © 2003, Neptune
At the end of Fault Locating sequence:
• All backbone breakers are closed (onto fault, if there is one)• All spur cable switches are open• Next part of sequence is Fault Clearing
Neptune Power Versions compared 18 All rights reserved © 2003, Neptune
Circuit description
• Fault Clearing mode• Supply to – 500 V, current limited
ControlControl
To Science
-500V
Neptune Power Versions compared 19 All rights reserved © 2003, Neptune
Circuit description
ControlControl
To Science
-500V
• Fault Clearing mode• Backbone switches open if
appropriate
Neptune Power Versions compared 20 All rights reserved © 2003, Neptune
At the end of Fault Clearing sequence:
• Nearly all backbone breakers are closed• If there is a fault, closest breakers are open• All spur cable switches are open• Next part of sequence is Science Node Connecting
Neptune Power Versions compared 21 All rights reserved © 2003, Neptune
Circuit description
• Science Connecting mode• Power feed output increased to -1000V
ControlControl
To Science
-1000V
Neptune Power Versions compared 22 All rights reserved © 2003, Neptune
Circuit description
ControlControl
To Science
-1000V
• Science Connecting mode• Spur Cable switches closed if not faulted
Neptune Power Versions compared 23 All rights reserved © 2003, Neptune
At the end of Science Connecting sequence:
• Nearly all backbone breakers are closed• If there is a fault, closest breakers are open• All spur cable switches are closed (unless faulted)• Next part of sequence is Normal Operation
Neptune Power Versions compared 24 All rights reserved © 2003, Neptune
Circuit description
• Power feed output increased to 10kV, system fully powered
ControlControl
To Science
-10kV
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