The network connection of Niehl 3 CCPP · 2015. 7. 28. · The concept Connecting the plant-side...

• Jicable’15, 21 - 25 June 2015 - Versailles - France• Jicable’15, 21 - 25 June 2015 - Versailles - France

The network connection of Niehl 3 CCPP

The first 380kV long-distance cable project in Germany since the Bewag projects in 2000

Fabian Schell, FICHTNER

Co-author:Heinz Uhlenküken, RheinEnergie (RNG)

• Jicable’15, 21 - 25 June 2015 - Versailles - France

Overview

• Project background

• The need

• The concept

• The challenge

• Cable route

• Impressions from site

• Quality control and testing


Project backgroundIn 2012 RheinEnergie decided to build a new 450 MW block at the existing plant location of the Niehl combined cycle power plant within the Cologne harbor area.

Niehl 2

Source: RheinEnergie, Alstom New 380kV GIS


The needThe network connection of Niehl 3 (NAN3) comprised three levels :

• 380kV connection to Germany’s transmission network

• 110kV connection to RheinEnergie’s distribution network

• Feeding RheinEnergie’s heat district system.

The particular location of the new plant - however - made a solution for the network connections more challenging , especially that of the 380 kV level.

Commissioning of the new plant will start in autumn 2015. Niehl 3 will finally enter commercial service in 2016.


The conceptConnecting the plant-side 380kV GIS with the transition point at RheinEnergie’s Merkenich S/S by 380kV underground cable.

From there, a 380kV OHL connection to the German transmission network at Amprion’s Opladen S/S.

Installation of a 380/110kV phase-shifting transformer at plant-side GIS for a 110kV cable connection to RheinEnergie’s Kalk S/S.


Ranking of large 380kV projects in GermanyWith a system length of almost 9 km , the underground section of the Niehl 3 network connection (NAN3) is Germany’s longest 380kV XLPE cable connection - so far.

Project name Year System Length

No. ofcircuits Conductor

NAN3, Cologne 2015 9.1 km 1 1x1600 Al solid

Bewag I (Berlin Mitte - Friedrichshain) 1998 6.5 km 2 1x1600 Cu segmented

Bewag II (Berlin Friedrichshain - Marzahn) 2000 5.4 km 2 1x1600 Cu segmented

EnLAG project Wesel-Meppen(2 partial undergrounding sections) 2015 ~3 km 2 2x2500 Cu segmented


Cologne in 1945


The challengePlanning an almost 9 km long underground cable system inside a complicated environment like the city of Cologne surely is a more complicated than in other environments:

− Still today there are numerous bomb disposals and UXO (unexploded ordnance device) suspects and every year.

− Due to reconstruction over the past decades there are nowadays numerous other utility lines , sewers and galleries in almost every street; unfortunately, not all of them are registered to date.

⇒ Very narrow trench available only !

⇒ Decision for a well-proven space saving ductbank design .


Cable route9 sections (27 cable lengths) of up to 1210 meters per drum.

8 joint bays of ⇒ 24 joints21 “pulling pits” for use of cable pushers during laying.


Impressions from site - construction phase


Impressions from site – cable laying


Impressions from site – cable laying

Pushing with up to 2x 2.2 to and Braking with up to 2x 2.5 to


Impressions from site – installation

Joint bay:18m x 3m x 2,5m (LxWxD)


Transition point at Merkenich S/S


GIS chamber at Niehl


Quality control and testingQuality control measures for the NAN3 project comprised: − Quality checks during production

− Routine and sample tests

− Tests for the extension of an existing prequalification (ePQ)

All test requirements were specified in the new German EHV cable standard DIN VDE 0276-2067 (2013-08).

Test requirements for the ePQ are slightly higher than those in IEC 62067, following the experience from the Bewag projects , e.g. test frequency, higher sensitivity and test voltage for PD measurement beyond others.

The ePQ was executed between April and September 2014.


After installation testsOn-site testing was performed in early April 2015.

The test voltage of 374kV (1h) was produced by a setup comprising four 260kV modules.

PD measurement (UHF method) was performed simultaneously on all 10 accessories per phase. ⇒ No (dangerous) PD detected


End of presentation

The network connection of Niehl 3 CCPP · 2015. 7. 28. · The concept Connecting the plant-side...

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