• Jicable15 21 - 25 June 2015 - Versailles - France
25-Jun-2015 Jicable'15 21 - 25 June 2015 - Versailles - France. Exemple: inox tubes in HV cable 220 kV 2500 mm² Al. Temperature monitoring on HV cables ...
Laboratory and field partial discharge measurement in HVDC power
The longer data acquisition time under DC requires better interference and filtering measures. Page 7. •. Jicable'15 21 - 25 June 2015 - Versailles - France.
ASSESSING SMOKE AND HEAT RELEASE DURING
25-Jun-2015 Jicable'15 21 - 25 June 2015 - Versailles - France. ASSESSING SMOKE AND HEAT. RELEASE DURING COMBUSTION OF. ELECTRIC CABLES USING CONE.
Improved Method of Determining Bending Stiffness of Underground
Jicable'15 21 - 25 June 2015 - Versailles - France. Improved Method of Determining Bending. Stiffness of Underground Cables. Janislaw TARNOWSKI.
Versailles Wine List Curves 2015.cdr
Sauvignon Blanc can be made in a variety of different styles depending on the area. The styles vary from tropical fruit through.
Remnant Static Mechanical Stresses and Water Tree Ageing of
Result 1: No significant different water treeing during ageing at static and dynamic mechanical strain. Page 8. •. Jicable'15 21 - 25 June 2015 - Versailles -
New qualification tests for high loaded joints
Jicable'15 21 - 25 June 2015 - Versailles - France. Thermo-mechanical forces are never applied during the qualification of the joints and connectors
PQ TEST AND FIRST 230 KV CABLE SYSTEM IN MEXICO
25-Jun-2015 Jicable'15 21 - 25 June 2015 - Versailles - France. TAT & PQT – 230 kV EHV Cable System: Standards. Testing Requirements for HV & EHV Power.
Copper or Aluminium cable conductors broadly compared in a life
Jicable'15 21 - 25 June 2015 - Versailles - France. Copper or Aluminium cable conductors
Development and high temperature qualification of innovative 320
25-Jun-2015 Jicable'15 21 - 25 June 2015 - Versailles - France. PERFORMANCES AND POTENTIAL LIMITS OF EXISTING. CROSSLINKED INSULATIONS FOR HVDC CABLES.
New qualification tests for high
loaded joints •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceBlandine HENNUY, Laborelec, Belgium, blandine.hennuy@laborelec.comFred STEENNIS, Bernd VAN MAANEN, DNV GL, the Netherlands, Fred.Steennis@dnvgl.com
, Bernd.vanMaanen@dnvgl.com Eddy DE RIDDER, Simon STUL, Nexans Network Solutions,Belgium,
Eddy.De_Ridder@nexans.com
, simon.stul@nexans.comBen AERNS, Alliander, the Netherlands,
ben.aerns@alliander.comLeonBOKMA, Westland Infra, the Netherlands, Leon.Bokma@westlandinfra.nlPieter BUYS, Stedin, the Netherlands,
peter.buys@stedin.netPhilippeCOLIN, ORES, Belgium,
philippe.colin@ores.netRalf MEIER, 3M, Germany,
rmeier@mmm.comPietOOSTERLEE, DELTA Netwerkbedrijf, the Netherlands, poosterlee@dnwb.nlKenny SEURINCK, Eandis, Belgium,
kenny.seurinck@eandis.bePiet SOEPBOER, Enexis, the Netherlands,
Piet.Soepboer@enexis.nlHoussam TANZEGHTI,EDF, France, houssam.tanzeghti@edf.fr Marcel VAN DEN BERG, Sibelga, Belgium, marcel.vandenberg@sibelga.be •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceStarting point: high failure rate of
high (cyclic) loaded MV joints due to thermal mechanical forces •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceThermo-mechanical forces are
never applied during the qualification of the joints and connectors •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceTheoretical forces
•Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceMeasured forces
Actualforces are significant
• maximum approximately 6 kN for 240 mm², 16.5 kN for 630 mm² • No significant difference between strandedand solid conductor •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceTwo options
All in one set up
Three tests to reproduce the
main causes of failure •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -France - water ingress in joints due to degradation of the interface between cable and joint water penetration test on joints - thermo-mechanical impact on behavior of the connector resistance mechanical (cyclic) test on connectors - thermal behavior thermal stability test •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceMECHANICAL TESTS
In the tests made in the past, different forces/stresses have been used and up to 200 push/pull cycles have been performed The test specimen consists of 2 identical connectors installed in the same way on the conductor with a small distance between the edges of the connectors •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceMECHANICAL TESTS
Several connector types - including hexagonal and deep indent crimped contacts and screw type connectors - installed on solid and stranded Alu conductors of 240mm² and 630mm² were tested. They were subjected to alternating push-pull force applications . The magnitude of the applied forces was gradually increased in steps from about 25 to 40 N/mm². •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceMECHANICAL TESTS
On some tested objects, the resistance between the connectors was measured while cycled at about 20 N/mm². A substantial resistance increase was observed at the relaxation phase during force reversal. This suggests that even momentary mechanical overloading - e.g. by conductor displacements in non-elastic cable arrangements - affects the contact resistance, the effect of which remains after the stress has been removed. The temperature increase could not be studied in this test set-up. •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceWATER PENETRATION TEST
Cable cleats are installed every 30 cm for a length of 4 meters on both sides of the joint. On each side of the joint, 1 meter cable section is not blocked such that lateral movement is possible in order to get a maximum stress on the water seals. •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceWATER PENETRATION TEST
testing procedure:1. after the cable has been installed , the PVC pipe will be filled with
water at the required pressure. As soon as the pipe is filled a first sheath test is performed2. the assembly is left to soak for 24 hours
3. a second sheath test is performed at 10 kV DC, for 5 minutes
4. the cable is subjected to 10 heating cycles as prescribed by
IEC61442. No test voltage shall be applied. The water temperature will not be controlled or measured5. a third sheath test is performed at 10 kV DC, for 5 minutes.
•Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceWATER PENETRATION TEST
A total of 14 medium voltage joints were tested. 4 out of the 14 joints were equipped with deliberate defects in order to investigate whether the test could discriminate between healthy and defective joints. In total4 joints failed the test (in relation to the expectations):
1 unexpected failure
1 unexpected survivor (a joint with insufficient sanding of cable outer
sheath survived 20 heating cycles)3 failed as would be expected (insufficient sanding and degreasing +
sand/dust + pollution + rope defect). •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceWATER PENETRATION TEST
However, all joints that did fail, failed within 1 hour after water was added. Thus, all failures occurred before any heating cycles were applied. Based on these results it seems that, if a defect is present threatening the water tightness, this will probably also show up in a sheath test without the application of heat cycles. One of the joints with deliberate defect did not show up in the sheath test, even after enduring 20 heating cycles.Thus, it seems that the application of the number of heating cycles as proposed in this test does not seem sufficiently discriminative or particularly useful. •Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceEVALUATION OF THERMAL BEHAVIOR
The goal of the test is to evaluate the thermal behavior of the entire cable system (combination cable, joint and connector) in real conditions. The temperatures of the cable conductor, connector and joint are measured for several conductor temperatures (80C, 95C,110C and 125C).
•Jicable'15, 21 -25 June2015 -Versailles -France •Jicable'15, 21 -25 June2015 -Versailles -FranceEVALUATION OF THERMAL BEHAVIOR
Requirements:
(TC5)3. Registration TC4 + thermal image (determination of 'hot spot")
* increased with the sum of measurement faults The goal of the test is to evaluate the thermal behavior of the entire cable system (combination cable, joint and connector) in real conditions. The temperatures of the cable conductor, connector and joint are measured for several conductor temperatures (80C, 95C, 110C and125C).
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