• Jicable’15,21‐ 25June 2015‐ Versailles‐ France• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
138 kV Cable System Qualification to IEC 60840-2011 / ICEA S-108-
720-2012 / AEIC CS-9-06Ravi Ganatra, Milan Uzelec,
Jose Zamudio, Joshua Perkel
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Reliable Underground Cable System
CABLE
ACCESSORIES
INSTALLATION
COMMISSIONING
In the field Cables and Accessories are required to work together as a System
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Cable System Testing
CABLE
ACCESSORIES
INSTALLATION
COMMISSIONING
Cable / Accessories: Tested & Qualified, preferably as a System
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
ComponentAEIC CS9 requires component testing through:
Cable IEC 60840 ICEA S-108-720Joints IEC 60840 IEEE 404Terminations IEC 60840 IEEE 48
TAT and PQT Requirements for Cable Systems
36< kV ≤150 46< kV ≤150IEC AEIC
Cable System TAT: IEC 60840
TAT: AEIC CS9 through (IEC 60840 + ICEA S-108-720) - Not required, but preferred.
150< kV ≤500 150< kV ≤345IEC AEIC
TAT and PQT: IEC 62067
TAT and PQT: AEIC CS9 through IEC 62067 + ICEA S-108-720
No TAT or PQT for Individual Component.
There is more emphasis on System Qualification for Cable System up to 150 kV.
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
ComponentAEIC CS9 requires component testing through:
Cable IEC 60840 ICEA S-108-720Joints IEC 60840 IEEE 404Terminations IEC 60840 IEEE 48
36< kV ≤150 46< kV ≤150IEC AEIC
Cable System TAT: IEC 60840
TAT: AEIC CS9 through (IEC 60840 + ICEA S-108-720) - Not required, but preferred.
This paper describes the challenges encountered and addressed in the development of an IEC/AEIC/ICEA qualification test program for a 138 kV Cable System.
While assessing and addressing the complexities added by the required number of accessories per IEEE and other desired expectations.
TAT and PQT Requirements for Cable Systems
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Challenge 1: Component Types Needed Challenge 2: Loop Architecture for IEEE
2000 mm2 XLPE Cable with Smooth Aluminum Seam Welded Sheath (left) and
Wire & Tape and Aluminum Laminate Sheath (right)
Premolded Joints (Shown in Copper and Fiberglass Housing)
Terminations: Composite Outdoor, Dry GIS and Wet GIS
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Challenge 2: Architecture for IEEE/AEIC/IECObservations from Dummy Loop:• Current / temperature requirement for
separate IEC/AEIC/ICEA and IEEE are lower than IEEE/AEIC/IEC super combo.
• Effects of high loading currents on cable and connectors significantly increase challenge for the system and the laboratory.
Decided to accept an intermediate challenge of an IEC/AEIC/ICEA test program with the quasi-IEEE architecture.
Loop constructed such that the length and accessory architectures would be compatible with the “Super Combo Test” (SCT) approach.
Resulting loop comfortably exceeded the minimum size requirements of IEC.
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Challenge 3: Load Cycle RequirementsFeasibility Study
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Challenge 3: Load Cycle Requirements Feasibility Study
280:00276:00272:00268:00264:00260:00
120
100
80
60
40
20
4000
3000
2000
1000
0
Elapsed Time
Tem
pera
ture
[deg
C]
Curr
ent [
A]
95CurrentAmbient TempConductor Temp
116:00112:00108:00104:00100:0096:00
120
100
80
60
40
20
4000
3000
2000
1000
0
Elapsed Time
Tem
pera
ture
[deg
C]
Curr
ent [
A]
Current
Conductor TempAmbient Temp
256:00252:00248:00244:00240:00236:00
120
100
80
60
40
20
4000
3000
2000
1000
0
Elapsed Time
Tem
pera
ture
[deg
C]
Curr
ent [
A]
105
CurrentAmbient TempConductor Temp
96:0092:0088:0084:0080:0076:0072:00
120
100
80
60
40
20
4000
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1000
0
Elapsed Time
Tem
pera
ture
[deg
C]
Curr
ent [
A]
105
CurrentAmbient TempConductor Temp
IEC 60840 95–100C, 2 h window 8 h on AEIC/ICEA 100–105C, 2 h window 8 h on (IEC Compliant)
IEEE 100–105C, 6 h window, 12 h on(Heating Time Exceeds IEC & ICEA
Maximums)
Combined AEIC, ICEA, and IEEE 100–105C 6 h window, 8 h on
20
30
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Optimizing the Test Loop for AEIC/ICEA with Extra Accessories and Two Cable Designs
Recent ExperienceIncludes:230 kV TAT & PQT275 kV TAT138 kV TAT138 ICEA
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
AEIC/ICEA/IEC Test Sequence & Results
Order Test Type Std. Test for 138 kV
1 Bend Test IECICEA 3 forward and 3 reverse bends
2 AmbientPD
IEC
Ambient – 114 kV (start at 133 kV)
3 Hot Tan δ 95-100 ºC @ 76kV
4
Aging – 20 cycles
IEC 100-105 ºC 2h8 h on
24 h cycle159.8 kVICEA
Ambient Tan δ ICEA Ambient – 80 kV
Hot Tan δ ICEA 100-105 ºC – 80 kV
Order Test Type Std. Test for 138 kV
5 Ambient PDIEC Ambient - 114 kV (start at 133
kV)
ICEA Ambient – 160 kV
6 Hot PD IEC 95-100 ºC, 114 kV (start at 133 kV)
7 HotImpulse
IECICEA
100-105 ºC 2h650 kV Peak
8 acWithstand
IECICEA 200 kV for 2 h
9 Ambient PDIEC Ambient - 114 kV (start at 133
kV)
ICEA Ambient – 160 kV
10 Dissection IECICEA Examination and tear down
Optimized Test Loop with Long Thermal Loop (Left) and Main Loop (Right)
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
IEC Annex G 138 kV Cables and Shield Break Joint
Annex G - Setup for Thermal Cycling & As- Installed in Water Housing (Without Final Housing Seals)
Order TestType
Test Specifics for138 kV
1 Bend Test 3 forward and reverse bends
2 Pre-conditioning
3 Heating Cycles, 24 h8 h current, 16 h cooling
95 – 100 C 2h
3 Aging 20 CyclesWater at 70 – 75 C 5h
4dc
Withstand
25 kV for 1 min across joint sectionalizer
5 25 kV for 1 min sheath to grounded exterior of joint
6Impulse
60 kV between parts
7 60 kV each part to ground
8 Dissection Tear down to determine if there has been moisture ingress
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Examination
Visual Examination of Termination and Joint
Moisture Indicating Tape at Both Ends of Annex G Joint
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Extension to IEEE
ANSI C119.4 Connection Stability Test
• AEIC, ICEA, and IEC do not directly address connector performance in their Ranges of Approval.
• IEEE 404 refers users to ANSI C119.4.
• To better understand the behavior of connectors in HV cable systems when going to “Super Combo Test”, it was decided to undertake the Copper-Copper Connection Stability described in ANSI C119.4.
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Conclusions• Demonstrated the feasibility of adding the number of accessories
required in IEEE standards for accessories.
• Test program successfully completed all requirements for approval under AEIC, ICEA, and IEC with the following components:– 55 m of 138 kV XLPE cable with 2000 mm2 segmental copper conductor– 3 Premolded joints (1 shield break & 2 straight joints)– 2 Dry-type GIS terminations– 2 Wet-type GIS terminations– 1 Composite outdoor termination
• Cable system far exceeds the minimum number of accessories and cable length required for either AEIC, ICEA, or IEC.
• The “Super Combo Test” approach is technically feasible but imposes significant challenges on the cable, accessories, and laboratory.
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Future Challenges• This work has exposed the limitations of the extensions
made in IEEE from prior experience with MV accessories.
• Lessons learned could help understand: How to differentiate requirements for Medium Voltage and HV/EHV components in IEEE Standards?
• Experience gained during this work will help bring necessary changes in future IEEE standards so that they are more aligned with AEIC and IEC standards since the system testing is more favored by the users for HV/EHV Systems.
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• Jicable’15,21‐ 25June 2015‐ Versailles‐ France• Jicable’15,21‐ 25June 2015‐ Versailles‐ France
Merci, Beaucoup!
Thank You!
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