Nexans' Superconducting Fault Current Limiters for medium voltage applications
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Frankfurt (Germany), 6-9 June 2011 Achim Hobl – Germany – RIF Session 1 – 0352 – p 1 Nexans' Superconducting Fault Current Limiters for medium voltage applications - status and prospects - Achim Hobl, Joachim Bock, Simon Krämer, Markus Bludau, Judith Schramm, Christian Jänke, Steffen Elschner Nexans SuperConductors
description
Nexans' Superconducting Fault Current Limiters for medium voltage applications - status and prospects - Achim Hobl, Joachim Bock, Simon Krämer, Markus Bludau, Judith Schramm, Christian Jänke, Steffen Elschner Nexans SuperConductors. Contents. Function of SFCL´s - PowerPoint PPT Presentation
Transcript of Nexans' Superconducting Fault Current Limiters for medium voltage applications
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 1
Nexans' Superconducting Fault Current Limiters for medium voltage applications
- status and prospects - Achim Hobl, Joachim Bock, Simon Krämer, Markus Bludau,
Judith Schramm, Christian Jänke, Steffen ElschnerNexans SuperConductors
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 2
Contents
Function of SFCL´s
Possible installation sites
SFCL Systems
Perspectives for future grids
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 3
current
volt
age
normal conductor
current
vo
lta
ge superconductor
normal conductor
Ic
Operating area of HTS devices
operating area HTS FCLnormal operation limitation
Tran
sitio
n fa
ster
due
to te
mpe
ratu
re ri
se
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Achim Hobl – Germany – RIF Session 1 – 0352 – p 4
Resistive LimitationFCL
Breaker
Load
+ compact+ intrinsically safe+ strong limitation+ independent of short circuit level– current leads to low temperature
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 5
Inductive Limitation
+ no quench of the superconductor+ can be without interruption– large volume and weight– low level of limitation– relatively high impedance
FCL
Load
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Function
-40
-20
0
20
40
60
80
0 20 40 60 80 100 120 140
Time [ms]
Cu
rren
t [k
A]
Limited Current
Prospective CurrentNominal Current
normal operation limiting operation
• ultrafast reacts in 1-2 ms
• automatic no external trigger, self-recovering
• wear-free service only for cooling
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 7
Installation sites• Bus bar coupling
• In line (secondary side of transformer)• House load protection in power plants
(auxiliary power)
FCL
FC
L
Transformer feeder
Busbar coupler
High voltage
Medium
voltage
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 8
Advantages of the FCL system Passive limiting characteristics of the superconductor Inherently safe and free from wear and maintenance The power flow is not interrupted completely Less mechanical and thermal stress
Higher network reliability Considerable cost savings Low impedance networks Voltage stability and reduction of harmonics Load levelling of busbars / transformers
Customer benefits
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 9
FCL Systems 12-100 (ASL 1) first commercial system
Field tested for ~8 months
12-800 (Vattenfall)first system in a power stationField tested Nov. 2009 - Dec. 2010
XX-YYYXX: Voltage [kV]YYY: Current [A]
12-400 (ASL 2) second system for UK (bifilar)
Delivered to UK April 2011
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 10
12-100
ASL, NewcastleENW, Bamber
Bridge
Live on grid10-2009 to 06-
2010
Frankfurt (Germany), 6-9 June 2011
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12-400
Test at IPH
Customer has ordered second system!
Frankfurt (Germany), 6-9 June 2011
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12-800
Frankfurt (Germany), 6-9 June 2011
Achim Hobl – Germany – RIF Session 1 – 0352 – p 13
12-800Power Plant Boxberg, Germany
Supply for crushers
and conveyor belts
Nominal voltage Ur = 12 kV
Nominal current Ir = 800 A
Inrush current, peak imax = 4100 A (50 ms)
Inrush current, rms Imax = 1800 A (15 s)
Prospective short current ip = 63 kA (R/X=0.08)
limited 1st Peak ilim < 30 kA
Limiting time t = 120 ms
Operating temperature T = 65 K
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Perspectives for future grids
Low impedance networks WITH low short circuit power
Supports integration of distributed generation
Load / generation growth without substation upgrading
Improvements in availability and stability
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Integration of distributed generation110 kV
10 kV grid
generatortransformer
G
5...50 MVA
10 kV FCL
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thank youfor your
attention
powersafetyat itsbest
