1C O M E T 2 0 1 7

C O M E T 2 0 1 7W E L C O M E T O A

T E C H N I C A L P A P E R P R E S E N T A T I O N

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B Y T h o m a s R a k

PG&E’s initiative to useSF6 gas alternatives in

Gas InsulatedEquipment

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A B O U T T H E A U T H O R

T h o m a s R a k

M a n a g e r o f S u b s t a t i o n

a n d T - L i n e S t a n d a r d s ,

P a c i f i c G a s a n d E l e c t r i c C o m p a n y

A B O U T T H E A U T H O R

BRIEFBIO

A graduate of New Jersey Institute of Technology with a BSEE (powerconcentration) and Portland State University MSE.Over 20 years of experience in the electric utility industry managingelectrical distribution design, substation design and generation design.Presently management sponsor for the implementation of aSubstation Asset Condition Monitoring system at PG&E.

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The 2050 Goal

California state GHG Goal80% reduction in Green house gasemissions by 2050

PG&E Leadership CommitmentVIDEO

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Framing the issueCO2 is a Green house gas.§ CO2 has a GWP of 1§ CO2 has a life span in the atmosphere of about 20 years§ California is reducing its CO2 footprint

SF6 is a Green house gas.§ SF6 has a GWP of 23,500§ SF6 has a life span in the atmosphere of about 3,200 years§ CARB regulates utilities to reduce their SF6 leak-rate

PG&E alternatives to SF6 initiative§Discontinue SF6 purchases for MV (<60kV) equipment 2017§ Investigate alternatives for HV (>60kV) equipment 2016-2017§Start implementation of strategy 2018

6C O M E T 2 0 1 7RFI Supplier Selection & Evaluation Process

SupplierSelections /Invitation to

RFP

15 SuppliersIdentified fromworld-wide as

potentialcandidates to

provide GasInsulated HV

equipment

13 SuppliersIdentified

capable ofproviding≥ 70kV

10SuppliersInvited to

RFI

7 SuppliersSubmitting

response toRFI

Suppliersidentified with GIS

& Breakercapabilities ≥ 70kV

Suppliers polled forinterest in PG&E RFI

Suppliers submittingRFI based on ability

to meet PG&Erequirements

for SF6 alternative

SupplierSubmissionEvaluations

Overview of Strategic Sourcing Supplier Evaluation process to identify viable Suppliersto provide SF6 alternative for GIS and Gas Insulated Dead Tank Breakers

GEHICOHitachiMEPPISiemensABBToshiba

GEHICOSiemensABBMEPPI

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Pure

Gas

esG

asM

ixtu

re

Sulfur hexafluoride Clean-Air Flournitrile 4710 C5-Flourketone 5110

Chemical formula SF6N2 + O2

(80% / 20%) (CF3)2CFCN (CF3)2CFC(O)CF3

CO2-equivalent (GWP) 22,800 0 2,210 1

Boiling point (Celsius) -64° < -183° -5° +27°

Dielectric strength 1* 0.43 2.2 1.7

Carrier gas None, N2 or CF4

/

~ 95% CO2~ 90% CO2 w. N2

or O2

CO2-equivalent (GWP) 22,800 ~ 380 <1

Boiling point (Celsius) <-64°(variable) ~ -25° +5°

Dielectric strengthat same pressure 1* 0.43 0.87…0.92 2 0.7 3

Arc

Impa

ct

Decomposition productshydrofluoric acid,

sulfur dioxide,sulfur compounds

Only if failure:ozone and nitrogen oxides Incl. Carbon monoxide, carbon dioxide, hydrofluoric acid

* Relative dielectric strength, normalized to SF6 (=1)2 pressure 0,67MPa…0,77MPa, Source: Y. Kieffel, et al. „SF6 Alternative Development for High Voltage Switchgears,“ in Cigré Session, 2014.3 pressure 0,45 MPa Source: J. Mantilla, et al „Investigation of the Insulation Performance of a New Gas Mixture with Extremely Low GWP,“ in Electrical Insulation Conference, USA, 2014.

Results from PG&E RFPProperties of different SF6 gas & alternatives

HICO/GE ABBSiemens/Hitachi

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Results of PG&E RFPSuppliers: HV equipment availability as of June 2017

ProductVoltage

level

Non-SF6Dead Tank Breakers

Non-SF6GIS

72kV Hitachi 2007GE 2025

Siemens 2020

GE 2020Siemens 2017

HICO 2014/2021

145kV Hitachi 2018GE 2022

Siemens 2020

GE 2020(50kA)Siemens 2019HICO 2019

245kV GE 2026Siemens 2022

GE 2026Siemens 2023

HICO 2018

550kV GE 2028Siemens 2025

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Actions takenActions taken to move PG&E away from SF6§ Installed 2 72kV Hitachi vacuum dead tank breakers in 2010 (Pilot).§ Installed 2 72kV Hitachi vacuum dead tank breakers in 2017. (Pilot)§Ordered >30 72kV Hitachi vacuum dead tank breakers for 2018.§Ordered 3 145kV GE g3 dead tank breakers for 2022 install (Pilot)§Ordered 3 245kV GE g3 dead tank breakers for 2026 install (Pilot)§Ordered 3 550kV GE g3 dead tank breakers for 2028 install (Pilot)§Ordered 1 145kV 50kA single bay GE g3 for 2020 (Pilot).

Barriers and road-blocks to change§ Industry alignment§ IEEE standards revisions§PG&E commitment

10C O M E T 2 0 1 7PG&E Roadmap to 2030

PG&E plans to discontinue the purchase of new SF6 basedHV equipment:§72kV SF6 equipment after 2024§145kV SF6 equipment after 2026§245kV SF6 equipment after 2028§550kV SF6 equipment after 2030

California Air Resource Board amending existing regulation tomandate phase-out use of SF6 starting in 2025.

11C O M E T 2 0 1 7PG&E Roadmap to 2050PG&E: SF6 HV Equipment replacement road-map

Total replacement after 2050

Class 2012 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2050Total

Replaced

Non-SF6 Circuit Breakers (Dead Tank)

72 kV

Installed 2 2 10 17 25 25 30 35 35 35 35 35 35 35 35 819

115 kV

Installed 0 0 0 0 6 6 6 10 15 25 35 50 55 55 55 1391

230 kV

Installed 0 0 0 0 0 0 3 3 3 10 35 35 35 35 35 883

550 kV

Installed(3phase)

0 0 0 0 0 0 0 0 0 1 1 1 3 3 3 110

Non-SF6 Gas Insulated Switchgear

115 kV

Installed 0 0 0 0 0 1

12C O M E T 2 0 1 7FEEDBACK

Thank You

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P A P E R Q & AC O M E T | C O L L A B O R A T E | S H A R E

K N O W L E D G E | P R O G R E S S

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1 - 8 0 0 - V E R Z U S+1 415 973 5066

I N S E R T E M A I Lt1rv@pge.com

L I N K E D I N

THOMAS RAK.

PG&EManager, Substation & T-Line Standards

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