AmpaCity Project

Advanced Superconducting Cable System

for Urban Power Supply

Frank Schmidt

EPRI Superconductivity Conference

October 2013

NEXANS PROPRIETARY Houston – October 2013 – 2

Agenda

AmpaCity Project Overview

Techno-economical Study

AmpaCity Installation

HTS System Design

AmpaCity Project Status

Conclusions

NEXANS PROPRIETARY Houston – October 2013 – 3

AmpaCity Project Objectives

Installation of 10 kV, 40 MVA (2.3 kA) HTS system in German city

Essen

Project started in September 2011 with duration of 4.5 years

Commissioning before end of 2013

Demonstration period of at least 2 years

Funded by the German Federal Ministry of Economics and Technology

Investigation of technical feasibility of HTS systems in distribution

grids

Comparison of investment between MV HTS and conventional HV

systems

Evaluation of operational advantages during demonstration period

Assessment of further HTS system applications

NEXANS PROPRIETARY Houston – October 2013 – 4

Project Team and Responsibilities

RWE

Specification of HTS system to be installed in distribution grid

Field test of HTS system connecting two substations

Nexans

Development of HTS cable including type test of all components

Manufacturing of HTS cable system and HTS fault current limiter

KIT

HTS tests and characterization

AC loss measurements and modeling (FEM 2D and 3D)

NEXANS PROPRIETARY Houston – October 2013 – 5

Ampacity project overview

New grid concept

MV

HV HV

MV

introducing

superconducting

MV cables

NEXANS PROPRIETARY Houston – October 2013 – 6

Conventional 110 kV cable

12

00

600

175 175125 125

10

50

650

85

0

125125 100 100100 100

145

200

400

70

0

100 100

Techno-economical study

3 solutions considered

Conventional 10 kV cables Superconducting 10 kV cable

NEXANS PROPRIETARY Houston – October 2013 – 7

A

D E

40 MVA

J

B

C

F

IHG

40 MVA

40 MVA 40 MVA 40 MVA 40 MVA

40 MVA

40 MVA

40 MVA40 MVA

110 kV OHL

110 kV UGC

10 kV UGC

110 kV busbar

10 kV busbar

Bus tie (open)

5,0 km

6,2 km

4,6

km

2,6

km

2,7

km

3,0

km

3,1

km

2,2 km

3,6 km

2,6

km

4,3 km

3,2 km4,7 km

A

D E

40 MVA

J

B

C

F

IHG

40 MVA

40 MVA 40 MVA 40 MVA 40 MVA

40 MVA

40 MVA

40 MVA40 MVA

110 kV OHL

110 kV UGC

10 kV UGC

110 kV busbar

10 kV busbar

Bus tie (open)

A

D E

40 MVA

J

B

C

F

IHG

40 MVA

40 MVA 40 MVA 40 MVA 40 MVA

40 MVA

40 MVA

40 MVA40 MVA

110 kV OHL

110 kV UGC

10 kV UGC

110 kV busbar

10 kV busbar

Bus tie (open)

110 kV OHL

110 kV UGC

10 kV UGC

110 kV busbar

10 kV busbar

Bus tie (open)

5,0 km

6,2 km

4,6

km

2,6

km

2,7

km

3,0

km

3,1

km

2,2 km

3,6 km

2,6

km

4,3 km

3,2 km4,7 km

Economic Study - Urban Grid with HV Cables

Future grid structure has

been designed based on

Conventional 110 kV

cables

Superconducting 10 kV

cables

Perquisites: same

redundancy (n-1)

Economic viability compared

NEXANS PROPRIETARY Houston – October 2013 – 8

5,0 km

6,2 km

4,6

km

2,6

km

2,7

km

3,0

km

3,6 km

6,8 km

3,2 km

4,7 km

A

D

E

J

B

C

F

I

H

G

110 kV OHL

110 kV UGC

10 kV UGC

110 kV busbar

10 kV busbar

Bus tie (open)

40 MVA

40 MVA 40 MVA

40 MVA

40 MVA

40 MVA40 MVA40 MVA

40 MVA

40 MVA

3,0

km

8,4

km

2,7

km 2,6

km

5,0 km

6,2 km

4,6

km

2,6

km

2,7

km

3,0

km

3,6 km

6,8 km

3,2 km

4,7 km

A

D

E

J

B

C

F

I

H

G

110 kV OHL

110 kV UGC

10 kV UGC

110 kV busbar

10 kV busbar

Bus tie (open)

40 MVA

40 MVA 40 MVA

40 MVA

40 MVA

40 MVA40 MVA40 MVA

40 MVA

40 MVA

A

D

E

J

B

C

F

I

H

G

110 kV OHL

110 kV UGC

10 kV UGC

110 kV busbar

10 kV busbar

Bus tie (open)

110 kV OHL

110 kV UGC

10 kV UGC

110 kV busbar

10 kV busbar

Bus tie (open)

40 MVA

40 MVA 40 MVA

40 MVA

40 MVA

40 MVA40 MVA40 MVA

40 MVA

40 MVA

3,0

km

8,4

km

2,7

km 2,6

km

Economic Study - Urban Grid with MV HTS

Cables

Dispensable devices for new grid concept

• 12.1 km of 110 kV cable systems

• 12 x 110 kV cable switchgear

• 5 x 40 MVA, 110/10 kV

transformers

• 5 x 110 kV transformer switchgear

• 5 x 10 kV transformer switchgear

Additionally required devices for new grid concept

• 23.4 km of 10 kV HTS cable

system

• 16 x 10 kV cable switchgear

• 3 x 10 kV bus ties

NEXANS PROPRIETARY Houston – October 2013 – 9

> Comparison of the 3 options based on NPV method

> Investment costs and operating costs (maintenance and losses)

> 40 years

> 2 % yearly increase

> 6.5 % interest rate

> 65 €/MWh

Tota

l N

PV

in M

€

103.2

87.7

93.7

Techno-economical study

Conclusion

Real estate value

represents additional

benefit for the HTS

technology

NEXANS PROPRIETARY Houston – October 2013 – 10

AmpaCity Installation in Essen,

Germany

Luftbild: "Darstellung aus HK Luftbilder / Karten Lizenz Nr. 197 / 2012 mit Genehmigung

vom Amt für Geoinformation, Vermessung und Kataster der Stadt Essen vom 13.02.2012"

Technical specification

- 1 km distance between substations

- 10 kV system voltage

- 2.3 kA operating current (40 MVA)

Substation

Dellbrügge

Cable Joint

Substation

Herkules

NEXANS PROPRIETARY Houston – October 2013 – 11

40 MVA

40 MVA

40 MVA

40 MVA 110 kV 10 kV

10 kV

110 kV UGC

110 kV UGC

Substation

Herkules

Substation

Dellbrügge

Ampacity project

Present electrical configuration

NEXANS PROPRIETARY Houston – October 2013 – 12

40 MVA

10 kV

40 MVA 110 kV

10 kV

40 MVA

FCL 10 kV HTS UGC

110 kV UGC

Substation

Herkules

Substation

Dellbrügge

Ampacity project

Configuration with supercond. system

NEXANS PROPRIETARY Houston – October 2013 – 13

Substation Dellbrügge – Basement and

1st Floor

NEXANS PROPRIETARY Houston – October 2013 – 14

Substation Herkules – Front

NEXANS PROPRIETARY Houston – October 2013 – 15

Substation Herkules – Back

Empty trans-

former box

NEXANS PROPRIETARY Houston – October 2013 – 16

Joint Location

NEXANS PROPRIETARY Houston – October 2013 – 17

Cable Design

Dielectric Former

Screen

Outer LN2 Cooling

Cable Cryostat

Inner LN2

Cooling

Phase 1 Phase 2

Phase 3

NEXANS PROPRIETARY Houston – October 2013 – 18

Termination Design

Termination

Cryostat

Cooling

Inlet Phase 1

Phase 2

Phase 3

Cooling

Outlet

Measurement

Connection

Cable

Connection

Screen

NEXANS PROPRIETARY Houston – October 2013 – 19

Parameter Value

Rated power 40 MVA

Rated voltage 10 kV

Rated current 2.3 kA

Lightning impulse withstand

voltage 75 kV

Power frequency withstand

voltage 28 kV

Prospective peak short

circuit current 50 kA

Prospective short circuit

current 20 kA

Limited peak short circuit

current < 13 kA

Limited short circuit current < 5 kA

Limitation time 100 ms

Fault Current Limiter Design

NEXANS PROPRIETARY Houston – October 2013 – 20

> 4 kW cold power at 67 K

> Subcooled pressurized nitrogen

> Forced flow in closed circuit

> High availability and reliability

Cooling System Design

Pressure

Built-Up

HTS Cable

SFCL

Vacuum

Pump

lN2 Storage

Tank

Circulation

Pump

NEXANS PROPRIETARY Houston – October 2013 – 21

Status Cable Development

Pre-prototype cable

Manufacturing of 100 m pre-prototype cable was completed in June 2012

Installation of pre-prototype test setup (30 m cable loop with terminations) has been

finished

High voltage tests have been performed on pre-prototype test setup

Bending test on 20 m pre-prototype cable has been carried out

Cable sections from bending test have been dissected and inspected

Prototype cable

Manufacturing of prototype cable was completed in October 2012

Prototype cable was installed with joint and terminations in HV test lab

Type test of prototype cable setup was successfully finished

NEXANS PROPRIETARY Houston – October 2013 – 22

Test Setup Pre-Prototype Cable

NEXANS PROPRIETARY Houston – October 2013 – 23

Type Test Setup Prototype Cable

NEXANS PROPRIETARY Houston – October 2013 – 24

Prototype Termination

NEXANS PROPRIETARY Houston – October 2013 – 25

Prototype Joint

NEXANS PROPRIETARY Houston – October 2013 – 26

Type Test Sequence Prototype Setup

PD test at 20 kV (after 24 kV for 1 min)

20 Load cycles with 2.3 kA (3 phase)

PD test at 20 kV (after 24 kV for 1 min)

Lightning impulse test at ± 75 kV

AC voltage withstand test at 30 kV (4 h)

NEXANS PROPRIETARY Houston – October 2013 – 27

Cable Cryostats

NEXANS PROPRIETARY Houston – October 2013 – 28

AmpaCity – Cable Installation

NEXANS PROPRIETARY Houston – October 2013 – 29

AmpaCity – Fault Current Limiter

Installation

NEXANS PROPRIETARY Houston – October 2013 – 30

Application for funding at the German Ministery of Economics and Technology (BMWI) - March 2011

Project acceptance by BMWI with 43% funding on September 5th 2011

Manufacturing of Prototype - Q3 and Q4 2012

Successful type test beginning of 2013 – Start of cable system manufacturing

Ground breaking ceremony in Essen on April 9th, 2013

Installation of HTS System - Q3 and Q4 2013

Commissioning - Q4 2013

Grid operation - 2013 to 2015

Analysis of grid operating experience and discussion of further implementation steps - early 2016

AmpaCity – Status and Milestones

NEXANS PROPRIETARY Houston – October 2013 – 31

Superconductors have come out of laboratories and are now

ready to be incorporated in power grids

Superconducting systems constitute attractive alternatives to

conventional systems

Reducing operating voltages

Enabling new grid concepts

Reducing the number of inner city transformer substations

The economical viability of superconducting systems is

now achievable

Conclusion

Thank You For Your Attention