Accredited and Independent High Voltage Laboratory

Services and products

! Consulting- investigations, studies, measurements,

R&D-projects- directly applicable solutions and advices

! Software- power system analysis (SIMPOW®, NEPLAN®),

insulator selection (IST), reliability of power lines (LPE),dynamic current rating (I-Q)

! High voltage testing- development, type and delivery testing

Customers! Power grids and producers

AEP, CEA, CSG, EdF, Elforsk, Eltra, Entergy, EPRI, ESB, ESKOM,Fingrid, Forsmark, Fortum, OKG, PG & E, NTPC, Powerlink, Ringhals, Statnett, SvK, SwePol, Sydkraft, Tohoko El. Power, Vattenfall, etc.

! Manufactures of electrical equipmentABB, AFL Focas, Alstom, Balfour Beatty Rail, BHEL, Bombardier,Cooper Power Systems, Lapp Insulators, Nexans, NGK, Nordtrafo,Siemens, Trench, Tyco, Zibo Taiguang Electrical Equip. Factory, etc.

! IndustriesAssi Domän, AvestaPolarit, AzoNobel, Billerud Paper, Holmen Paper,LKAB, Ovako Steel, Solna Offset, SSAB, SSG, StoraEnso, Volvo, etc.

! Railway companies Banverket, Jernbaneverket

Consulting – Technology areas! Insulation

! Lines & Substations

! Power System Analysis

! EMC & Power Quality

! Operation & Maintenance

2006-10-147

E – Finance & Business SystemsLisa Berntsson

M – Sales & Client RelationsCarl Öhlén

Q – Quality AssuranceSonja Berlijn

PresidentDan Wikström

Operating team

Supporting team

RLLines &

Substations

RKPower System

AnalysisT

Testing

REEMC &

Power Quality

RAOperation &MaintenanceHuman

Resources

RIInsulation

R – Technology Services & SoftwareIngvar Hagman

2006-10-148

RIInsolation

Dr. Igor Gutman

RLLines & Substations

Dr. Jan Lundquist

RKPower System Analysis

Kerstin Lindén

RAOperation & Maintenance

Carl Öhlén

REEMC & Power Quality

Prof. Math Bollen

R – Technology Services & SoftwareIngvar Hagman

Technology Areas

T – TestingLars-Olof Gunnarsson

800 kV HVDC pollution testing-China Souther Power Grid-

Ice flashover performance-Scandinavian power utilities-

The independent, accreditedand international recognized third

Party

SATSSATSSATSSATSSTLSTLSTLSTL

Insulation! Insulators and air gaps

! Conventional and polymeric insulators! Apparatus and line insulators

! Specification / optimisation! Selection and dimensioning

! Flashover performance! Service/Ageing performance! Material properties

! Construction guidelines! Qualification methods and criteria! Availability of stations / network

! Ready-to-use software for OH lines

Insulation – cont’! Diagnostics / Maintenance

! Live diagnostic methods for polymer insulators

! Visual inspection guides for! Polymeric insulators! Condition of grease coverings! Hydrophobicity

! Choice of palliatives! Coatings, grease, live washing etc.

! Fault analysis! In-service failures! Laboratory tests

Design specifications for insulators

! Testing! Modelling! Recommendations

Breakdown probability and puncture risk of solid insulation at an external flashover

0,000E+00

1,000E-01

2,000E-01

3,000E-01

4,000E-01

5,000E-01

6,000E-01

7,000E-01

8,000E-01

9,000E-01

1,000E+00

200 300 400 500 600 700 800 900 1000

U, kV

Prob

abili

ty

Air gap

Solid insulation

Puncture risk

Voltage at foil edge

Practical applications: China, South Africa, Finland, Sweden, Norway

0.2 0.4 0.6 0.8 1 1.2 1.4 1.640

45

50

55

60

65

70

75

U [kV] = 9.93 * ESDD −0.231 [mg/cm2]

ESDD avg

[µg/cm2]

Min

imum

flas

hove

r vo

ltage

[kV

]

Towers:

4

5

13

14

41

42

82

91

92

STRI is your best partner for insulation optimization!

! Verified by service records software programs for failure rate of OHL

! Unique pollution test hall! Stiff DC/AC generators! Long-term experience with

pollution testing! Latest know-how via

participation in CIGRE, IEC and IEEE WG regarding pollution issues

Internationally recognized via active participation in CIGRÈ

(example “Insulation” area)! CIGRE WG C4.03.03 ”Pollution and environmental influence on

the electrical performance of electrical systems”, convenor Chris Engelbrecht (KEMA). STRI is a member.

! CIGRE WG A3.21 ”Aspects for the application of non-ceramicinsulators to HV and MV apparatus”, convenor Michele de Nigris (CESI). STRI is a member.

! CIGRE WG B2.03 ”Insulators”, convenor Frank Schmuck(SEFAG). STRI collaborates via other WGs

! CIGRE WG B2.26 ” “Electrical Aspects of Overhead Lines””, convenor D. Douglass. STRI is a member.

! WG D1.14 ” Material Properties for Nonceramic Outdoor Insulation”, convenor Josef Kindersberger (Technische UniversitätMünchen), STRI collaborates via other WGs

Internationally recognized via active participation in IEC

(example “Insulation” area)! IEC TC 36 WG 11 ”Guide for the selection of

insulators! in respect of polluted conditions”, Convenor Clive

Lumb (SEDIVER). STRI is a ”very welcomed guest”.! IEC TC 36 WG 12 ” Polymeric insulators for indoor

and outdoor use”, Convenor Jens Seifert (LAPP). STRI is a member.

! Swedish TC 36 ”Insulators”, Convenor Robert Axelsson (PPC Insulators). STRI is a member.

Internationally recognized via active participation in IEEE-1

(example “Insulation” area)

! TF 15.09.03.01 ”Aging of Outdoor Insulator DielectricMaterials”, convenor Andy Schaff.

! TF 15.09.03.02 ”Improving In-Service ContaminationPerformance”, convenor David Shaffner (PG&E).

! TF 15.09.03.03 ”Electric Field Modelling of NonceramicInsulators”, convenor Andrew Phillips (EPRI).

! TF 15.09.03.04 ”Bird Related Outages”, convenor Raji Sundararajan (ASU). STRI collaborates.

! TF 15.09.03.05 ”Insulator Contamination Testing”, convenor Anibal de la O Lavalle (TYCO).

Internationally recognized via active participation in IEEE-2

(example “Insulation” area)

! TF 15.09.04.01 ”Guidelines for In-Service Classification of NCI Damage”, convenor Erich Gnandt (Consultant). STRI collaborates.

! TF 15.09.04.02 ”Corona Testing of Hardware & Insulators”, convenor John Kuffel (Kinetrics).

Internationally recognized via active participation in IEEE-3

(example “Insulation” area)! TF 15.09.09.03 ”Icing Test Methods and Mitigation Techniques”,

convenor Masoud Farzaneh (Univ. of Quebec). STRI is a corresponding member.

! TF 15.09.09.04 ”High Temperature Conductor effects on ceramicand Non-Ceramic Insulator Performance”, convenor Geoff Powell (LAPP).

! TF 15.09.03.05 ”Ambient Temperature Influence on Ceramic and Non-ceramic Insulators, Line Post Deflection and Strength”, convenor Jack Varner (Southerm Company).

! TF 15.09.03.06 ”Review on Mechanism that Affects the In-Service Strength and End-of-Life Decisions for Ceramic and Glass Insulators”, Convenor Ezio del Bello (SEDIVER).