demo 4: innovative repowering of ac corridors · accc 980/75 annealed 175 ztacir 319/191...

DEMO 4: INNOVATIVE REPOWERING OF AC CORRIDORS

“INNOVATIVE NETWORK TECHNOLOGIES AND THE FUTURE OF EUROPE'S ELECTRICITY GRID” BEST PATHS DISSEMINATION WORKSHOPMADRID, 22 NOVEMBER 2017

Dr. Matthias Müller-Mienack

50Hertz Transmission GmbH/

GridLab GmbH

22 November 2017

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DISSEMINATION. WORKSHOP – 22 NOV. 2017

DEMO 4: Overview (I)

https://www.youtu.be/gxXzZdEfSY4

https://www.youtu.be/gxXzZdEfSY4

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Demo 4Upgrade of existing

AC overhead lines

for capacity increase

Leader: 50Hertz

• Insulated cross-arm tests & installation

• Innovative overhead line designs and retrofit processes

• Innovative live-line working

• Dynamic line rating based on low-cost sensor

• HTLS conductortests & installation

Goal: Increase the availability of capacity of existing AC assets

Main objective: Demonstrate the role and impacts of several innovative systems for the repowering of existing AC transmission corridors

Budget: 8,446 k€

DEMO 4: Overview (II)


http://www.bam.de/

http://www.bam.de/

DEMO 4: EXPECTED RESULTS & IMPACT

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• Optimisation of transmission capacity on existing lines

• Increased flexibility with regard to operation and maintenance

• Support of TSOs in overhead line construction, maintenance and operation

• Facilitation of new system operation options

• Reduction of overall investment since it is not necessary to build new lines

• Cost reduction due to shorter building time and minimisation of downtimes on the lines


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Insulated cross-arms• All planned innovative laboratory tests successfully finished, assured quality of the

insulated cross-arms for the new overhead line at Elia. Scientific part summarized in a number of publications, new test methods under consideration of CIGRE/IEC.

• Conductor pulling operations successfully, all sections equipped with insulated cross-arms.

Long-term tests with High Temperature Low Sag Conductors (HTLS)• Mechanical and electrical tests of HTLS conductors (incl. accessories) recently finished

• Evaluation of test results is ongoing.

Composite towers and rock foundation• Engineering for whole composite tower started

Live-line working (LLW)• Successful conductor car motion test through insulators during normal operation.

• Extension the existing technologies to compact, double circuit high voltage lines

• Air warning marker robot prototype produced and successfully tested.

Dynamic line rating (DLR)• Sensor prototype developed with high technical performance.

• First performance tests conducted.

DEMO 4: The Activities


Insulated cross-arms (I)

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• Three 5000 hours multi-stress tests performed:

o Heavy erosion not observed in service for larger diameters

o High level currents not typical for the ageing type of test

• Outcome: Proposal will be handed over to IEC TC 36 “Insulators” (indirect spraying)

Realized tests 1: Tracking and erosion test


Insulated cross-arms (II)

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• Test method for the Water Drop Corona Induced test is developed

• Representative, repeatable, reproducible, cost-effective

• Verified using actual cross-arms from Elia (4 designs are corona free)

• Outcome: Test method presented and included in the draft of CIGRE brochure developed by CIGRE WG B2.57

Realized tests 2: Corona test


Insulated cross-arms (III)

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• Rapid flashover pollution test developed and applied for a number of test configurations

• Can be practically applied for next section of Elia OHL (if coming close to the coast)

• The results are applicable for statistical dimensioning

• Outcome: Proposal for test method handed over to CIGRE WG D1.44 and results are included in recently published TB 691.

Realized tests 3: Pollution test


Insulated cross-arms (IV)

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Tests finished, operation started

• To assure the reliability careful verification of materials, individual insulators and complete cross-arms was performed

• The scientific part of the project resulted in a few innovative test methods presented for CIGRE/IEC for international acceptance.

• Two different manufacturers passed the complete test program

• The innovative structure of the cross-arm allowed for the compact overhead line 380 kV the same height as existing in the area 150 kV convenient overhead line. Operation started in October 2017

• Outcome: This may be an interesting example for other European utilities experiencing low public support of new overhead lines.

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HTLS long-term tests (I)

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Conductor typeAlloy Rated temperature

ϑr in °C

ACSS/TW 467/66 Annealed 200

ACPR 850/87 Aluminum-Zirconium (AT1) 150

GZTACSR 392/46 Aluminum-Zirconium (AT3) 210

TACSR 382/49 AT1 or better 150

ACCC 980/75 Annealed 175

ZTACIR 319/191 Aluminum-Zirconium (AT 3) 210

ACCR 715-T13 Aluminum-Zirconium (AT 3) 210

ACSR 380/50 Hard drawn 80

HTLS = High Temperature Low Sag conductor

7 high temperature conductors and one reference conductor system investigated


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• Long-term loading tests on conductor systems finished

• Mechanical and electrical performance tests finished

• Evaluation of test results currently ongoing

• Promising test results to be expected, e.g.:

Slippage test of a conductor fittingNew and aged carbon core after breaking test

HTLS long-term tests (II)Status quo of long-term tests with High Temperature Low Sag Conductors


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Next steps

• Finalisation of test evaluation in the upcoming weeks

• Reporting of test results in Deliverables 6.1 and 6.2

• All HTLS research activities expected to be finished by end of 2017

HTLS long-term tests (III)


Composite towers and rock foundation (I)

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Composite tower pole

Status quo

Composite towers

• Gluing test of full size (ø 900 mm) tube performed at CSUB (manufacturer) facilities

• Full scale compression test of two 25 meter composite poles performed

• Engineering for whole tower started

Rock foundation

• Determination of design heat-loads ongoing

• Engineering design of steel members

• Engineering design of GRP (glass reinforced plastic)

Rock foundation


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Composite towers

• Complete engineering for the whole composite tower

• Production and testing of complete tower

Rock foundation

• Complete evaluation of engineering challenges

• Reassessment of engineering design

Composite towers and rock foundation (II)Next steps


Innovative live-line working (LLW) (I)

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Field tests: Robotic installation of aircraft warning markers (AWMs)

5. October 2017: 2 AWMS installed on a test stand + 10 AWMs mounted on a powerline in exactly 1 hour using 2 robots.


Innovative live-line working (LLW) (II)

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Video showing robot mounting of air warning markers (AWM)

Supported by Newswire (film shooting) and Innova (building the robot)


https://www.youtube.com/watch?v=35ZuywMx1_k




Innovative live-line working (LLW) (III)

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Next steps with robotic installation of aircraft warning markers (AWMs)

• Complete technology qualification use at

Statnett

• Testing of production-line robots on a large scale project (60 markers, 6 spans)

• Testing of production-line robot on a live line


Innovative LLW (IV)

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Development of a new type of conductor car


• Ability to pass suspensor insulator

• Non-conductive materials

ICOLIM 2017 – „Development of a new type of conductor car from design to assembly”

• Best innovation award and best paper award

CENELEC CLC/TC78 - Acceptance of modification for existing IEC 50374 standard (live working conductor car)

Innovative live-line working (LLW) (V)

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Field testing of the conductor car

• The tuning of the conductor car based on the previously executed test runs is done.


Innovative live-line working (LLW) (VI)

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Video showing the field test of the conductor car


https://drive.google.com/open?id=0B5p3D5seeUHVMndFckp1SG40ajQ




Innovative LLW (VII)

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Insulator changing technology (I)

Insulated approach of live parts

• From the ground

• From the leg of the tower

Main and safety suspension

• Use of non-conductive materials

Non-conductive relieving and offload tools


Innovative LLW (VIII)

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Insulator changing technology (II)

• Successful tests were carried out of insulator changing technology and new tools


Innovative LLW (IX)

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Insulator changing technology (III)

Extension the existing technologies to compact double circuit high voltage lines:

• Use of reduced size mounting chair

• Use of portable protective air gap to reduce minimal approach distance

• Evaluation of standardised clearances


Innovative LLW (X)

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Investigation of electric and magnetic fields during high voltage live-line maintenance

• Investigation of face protection

• Examination of screening efficiency

• Inspection of extra-lowfrequency magnetic fields


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Dynamic line rating (DLR) sensor (I)Dynamic line rating (DLR) based on low-cost sensor – Status quo (I)

• Sag calculation based on tilt measurement: requires very high resolution techniques (+/- 0.005 deg (optimal)) to detect sag variations of max ≈ 10 cm)

• Additional information gathered (conductor acceleration, rotation and spot temperature measurement) to check inconsistencies

• Energy harvesting unit

• Wide range communications system between sensors or sensor-repeater (+15 km)


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DLR sensor (II)

• To ensure proper and safe performance of the DLR sensor (environmental, mechanical, vibration, drop and free fall, temperature, electrical, EMC, ESD, immunity, emission, LFI, RFI, etc.)

• Installable on live line conditions

EMC: Electro-magnetic compatibility

ESD: Electrostatic discharge

LFI: Low frequency induction

RFI: Radio frequency interference

Set of Tests (R&D)


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Dynamic line rating (DLR) sensor (III)Set of Tests (DEMO)

• Deployment in 220 kV OHL equipped with all necessary sensors in order to be able to validate the new DLR system

• OPPC System through which one sub-conductor is replaced by FO

• DTS in one ending point which allows to trackthe temperature profile along the whole line (32 km) with less than 10 m sampling

• Weather stations along the line route (6 in total)

OPPC: Optical phase power conductor

FO: Fibre optic

DTS: Distributed Temperature Sensor


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• The comparison of rating calculation methods (Cigre and IEEE) was carried out

• Algorithm based on these physical models to execute line rating calculations

• Improved calculation method taking into account precipitation

• Neural network improvement for more accurate calculations

Dynamic line rating (DLR) sensor (IV)Development of the BME VIKING physical model


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• White box algorithm based on IEEE and Cigre models

• BME VIKING improvement on physical factors

• Multi-layer neural network was built and trained based on actual weather data

Dynamic line rating (DLR) sensor (V)Black box and white box models


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• Sensitivity analysis for input parameters

• Processing of forecast data with interpolation

• Wind effect on every transmission line sections

• Select critical spans with different methods

Dynamic line rating (DLR) sensor (VI)The DLR system design and calculations


Dynamic line rating (DLR) sensor (VII)

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Next steps

• Forecast the ampacity of the line in a reliable and secure manner based on the available information for different time horizons.

• Examination of the forecasted data.

• Verification of the new-developed version of rating calculation modelbased on actual conductor data

• Development and training of black boxbased on actual conductor data


DEMO 4 @ Poster Session

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CONTACT

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Dr. Matthias Müller-Mienack

Advisor to the Chief Markets Head of Research & Studies& System Operations Officer Department

50Hertz Transmission GmbH GridLab GmbH

Heidestraße 2 Mittelstraße 7

10557 Berlin 12529 Schönefeld (nearby Berlin)

Germany Germany

matthias.mueller-mienack [email protected] @gridlab.de

www.bestpaths-project.euFollow us on Twitter: @BestPaths_eu


http://www.bestpaths-project.eu/

demo 4: innovative repowering of ac corridors · accc 980/75 annealed 175 ztacir 319/191...

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