Fall 2010 - Presentations
Check this page periodically to learn about the Presentations scheduled for the Spring meeting.
Please Note: This is a only a listing of the presentations and
UNLESS NOTED, DOES NOT IMPLY THE ORDER IN WHICH THEY WILL BE PRESENTED.
- Opening Session
- Mini-Expo Vendors
- Subcommittee A - Cable Construction and Design - Monday, October 18, 2010, 2:00 PM - 5:30 PM
- 2:00PM – 2:15 PM - Subcommittee Business/Announcements
- 2:15 – 2:50 PM - “Fluid-filled Underground Transmission Cable Condition Assessment” Harry Orton - Orton Consulting Engineers International, Vancouver, Canada, Lisa Ogawa, PhD - BC Hydro, Vancouver, Canada, (Formerly with Powertech), David Arnold - EPCOR, Edmonton, Alberta Canada
Abstract: Many underground power cable users are faced with aging fluid-filled transmission cables that have exceeded their design life of 30-40 years. Major and possibly costly decisions have to be made whether to replace or to continue to use the existing cable system. This paper presents a condition assessment strategy focused on fluid-filled cables that involves a combination of visual observations through on-site inspections, laboratory diagnostics, on-site diagnostics, operation reports and data trending. - 2:50 – 3:15 PM - “500 Hz Accelerated Aging Test Distinguishes 15 kV Power Cable Performance” – Michael Lauxman – General Cable, Mark Walton – General Cable.
Abstract: In North America, power frequency (60Hz) accelerated wet-aged testing is used to qualify medium voltage power cables, per ICEA standards (S-94-649-2004 and S-97-682-2007). Higher frequency (500Hz) accelerated wet-aging test protocols (CENELEC HD605) and BS-7802-1999) are accepted qualification test protocols for medium voltage power cables in Europe, Australia, Asia, and the Far East. This higher frequency qualification test protocol reduces the required maximum aging time from 360days to 3000hours (125days). This presentation provides the details of one such 500Hz qualification test protocol, and the AC breakdown strength and water treeing results for power cables insulated with three (3) commercially-available tree retardant crosslinked polyethylene (TRXLPE) insulations sold in North America and the rest of the world. - 3:15 – 3:25 PM - Break
- 3:25 - 3:50 PM - “600 V Rated Secondary Cable Survey” Yingli Wen - Consolidated Edison of New York, Bruce Bernstein – Consultant, Bill Thue - Consultant
Abstract: In 2009, a survey was conducted among the ICC members to determine the level of interest to form an ICC discussion/AD HOC group on 600 V rated secondary cables. An invitation was sent to approximately 900 members, of whom 97 participated representing a 10% response rate. The survey had 10 questions covering areas such as major factors affecting secondary cable reliability, performance records, secondary cable types, topics for discussions, etc. A majority of the respondents reported that the performance and reliability of secondary cable are a concern and they are in favor of forming a discussion/AD HOC group in ICC. The results of this survey will be presented in detail. - 3:50- 4:15 PM - "Condition Assessment of Service Aged Belted PILC cables", Vitaliy Yaroslavskiy – Cable Technology Laboratories, Inc.
Abstract: Results of laboratory evaluation of service aged PILC Cables, produced by different manufacturers in the period between 1937 and 1998, are summarized. The study indicates that, unless cable insulation suffered from moisture intrusion, most of the cable characteristics still meet modern requirements for new cables. The only exception was dissipation factor at elevated temperatures, which suggested that cable ampacity is reduced with cable aging. - 4:15- 4:40 PM - “Effect of Ethylene Content on Bowtie Trees and Wet Electrical Performance in Filled EPR Insulation Materials”, Amalendu Sarkar, Mark Easter, Ed Walcott, William Temple and John T. Smith, III - General Cable Corporation
Abstract: The insulations for extruded medium voltage power cables currently used worldwide are based on two broad categories of polymeric materials: crosslinkable elastomers, consisting of Ethylene Propylene Rubber (EPR), and crosslinkable low density polyethylene, consisting of Crosslinked Polyethylene (XLPE) or Tree Retardant Crosslinked Polyethylene (TRXLPE). These two broad categories have over 40 years of proven field performance. A considerable amount of research has been done on water treeing in unfilled semi-crystalline and amorphous elastomers. Very little research has been done on filled elastomeric systems, as water trees are more difficult to detect. One paper reports a link between ethylene content and crystallinity in an unfilled EPR base resin and other ethylene base resins. In reality, unfilled EPR resin is not a commercially viable insulation material for high demanding medium voltage applications. In filled EPR resin-based insulation materials, surface-treated clays are chemically bonded to the polymer chains. This changes the whole interpretation of degree of crystallinity (related to ethylene content) with respect to bowtie tree formation and long-term wet electrical performance. This presentation will report data that shows bowtie tree counts in carefully formulated higher ethylene content filled EPR insulation materials can be less than those for lower ethylene content and more amorphous EPR insulation materials in long-term wet electrical tests. This paper examines the influence of the ethylene content of base resins in suitably reinforced (with treated clay) filled EPR insulation materials with respect to its level of dispersion, formation of bowtie trees and ac voltage breakdown strength after accelerated wet-aged testing. However, the long-term wet ac breakdown strength testing via a step-rise high voltage time test (HVTT) after an accelerated water treeing test (AWTT) are found to be comparable in higher ethylene content (semi-crystalline) and lower ethylene content (more amorphous) filled EPR insulation materials. - 4:40 -5:05 PM - “Modeling Underground Cable Faults Utilizing Weibull and Crow-AMSAA” – Yancy Gill, PhD – Salt River Project
Abstract: This presentation will discuss the differences between the Weibull and Crow-AMSAA analysis techniques and how they can best be used to model underground cable faults. - 5:05 - 5:30 PM - The Impact of Transmission Cable Construction and Design on Commissioning Test Options and Results – Steve Campbell – General Cable, Ben Lanz - ImCorp
Abstract: Recent commissioning test experience on 230kV solid dielectric cable systems will highlight the impact that cable system construction and design have on cable test options and results. To achieve test results, which are comparable with factory partial discharge (PD) tests, a thorough understanding of how the cable system design will impact the test measurements and meaningful calibration is necessary. Experience indicates that simple design modifications early in the design process can greatly simplify the commissioning test process. Test results will be presented which will demonstrate what is achievable on a well designed cable system using an effective PD commissioning test technique.
- Subcommittee B - Accessories - Tuesday, October 19, 2010, 8:00 AM to 12:00 PM.
- 8:00-8:15 AM – Introduction/Announcements, Harry Yaworski, Tyco Electronics – chair
- 8:15-8:55 AM - “IEEE 404 and 386 Usual Service Conditions", Mike Smalley, We Energies.
Abstract: The IEEE ICC joint, termination, and separable connector standards have evolved quite a bit over the years. These standards continue to evolve and get better with each revision. The cable accessories are assumed to work satisfactorily when applied in the “usual service conditions” as defined in each standard. Some of the “usual service conditions” require no test at all in the standards. The slow evolution from laminar insulated lead sheathed cables to extruded concentric neutral jacketed cables may have caused some inconsistencies to appear in these standards that we as ICC members and guests should be able to address.
Michael J. Smalley received a B.S. degree in Electrical Engineering Technology from the Milwaukee School of Engineering in 1991 and a M.S. degree in Engineering (Electrical) from the University of Wisconsin-Milwaukee in 2000. He has been employed at We Energies in Milwaukee, Wisconsin since 1991. He is currently a Senior Engineer in the electric distribution standards and materials group where he has responsibility for underground medium voltage cable and accessories. He has previously held engineering positions in the nuclear power department and the transmission engineering group. He is a member of the IEEE and is a Senior Member of the IEEE Insulated Conductors Committee. He is presently the Chair of the AEIC Cable Engineering Committee and is a registered Professional Engineer in the state of Wisconsin - 8:55-9:35 AM “Testing of Interface Lubricants to Annex A, IEEE 386-2006”, Thomas Champion, NEETRAC—A Center of Georgia Tech
Abstract: The 2006 revision of IEEE 386 on separable connectors added requirements for the evaluation of lubricants used on the mating interface to prevent sticking. The requirements were placed in the annex rather than the body of the standard to allow experience to be gained using these procedures and to allow identification of problems and improvements that could be made in the test method. This presentation provides data on use of the accelerated aging test coupled with the operating force test for evaluating four silicone greases, including problems encountered using the test method.
Tom Champion received his BSEE from the Georgia Institute of Technology in 1977. He worked with Georgia Power Company for 25 years in various departments before joining NEETRAC, A Center of the Georgia Institute of Technology, as a Research Engineer in 1996. Tom has been extensively involved in forensics and issues associated with both underground and overhead distribution and transmission systems, doing work on the partial vacuum induced flashover problem with separable connectors, with dissimilar metals corrosion issues, and with switching and fault close operations. Tom has served as Chairman of ICC working groups on Revision of IEEE 386 and Failure Analysis, served as Chair and Vice-chair of Subcommittee B on Cable Accessories, and is currently ICC Vice-chair Treasure Elect - 9:35-10:15 AM “Cable Bend Testing”, Thomas Campbell, Con Edison.
Abstract: Under certain conditions, MV cable joints installed in network manholes require movement, putting mechanical stresses on the joint and leading to bending of the cable up to the minimum bend radius. It is important that joints maintain their moisture seals and electrical performance when moved or bent under these conditions. As IEEE 404 does not address this situation, a cable bend and a separate cable movement test were devised. The bend test includes heat cycling and bending of the cable and joints around a mandrel having a radius equal to the minimum bend radius. PD and AC hipot tests are applied at the end of the test as well as AC step breakdown to confirm the electrical integrity.
Thomas Campbell is a Senior Engineer for Consolidated Edison Company of New York. Prior to joining Con Edison he held multiple roles with Cablec/BICC/General Cable with responsibility for low, medium and high voltage cables, both laminar and solid dielectric insulated. He holds a B.S. degree in Chemical Engineering from Rensselaer Polytechnic Institute and an MBA from Iona College. - 10:15- 10:30 AM - Break
- 10:30-11:10 AM “How Smart Grid Applications Will Change Cable and Accessories Standards”, Abe Shocket, Tyco Electronics
Abstract: Smart Grid covers a wide array of applications, from PMUs to HANs. This presentation will focus on how applications such as EV charging, storage and integration of renewables will change the load profiles for distribution networks. New load types as well as load profiles may necessitate the need for new qualification test methodology in order to properly conduct accelerated aging tests. Abe Shocket (ashocket@te.com) is the Director of Energy Management Solutions for Tyco Electronics, Energy Division, responsible for Engineering, Product Management and Sales of products and technologies related to electric power measurement, quality and conservation, and is located in the US headquarters for Energy Products in Fuquay-Varina, North Carolina, USA. Abe holds a B.S. in Electrical Engineering from Carnegie Mellon University, and is a member of the IEEE. - 11:10-11:50 AM “The effect of water on service breakdown of oil-filled high voltage XLPE cable terminations”, Sverre Hvidsten, SINTEF, Frank Mauseth and Geir Birkenes, NTNU
Abstract: Breakdowns of high voltage cable accessories can be due to possible explosions causing a high risk for personnel. Moreover, in Norway the grid owners now have to pay a penalty for interruptions in power supply which is proportional to the energy not delivered. Typically, failures are experienced in terminations consisting of prefabricated stress-cones installed on the cable within oil-filled porcelain or composite housings. From the laboratory investigations of units failed in service several possible causes for failures have been identified. The most common is water ingress into the insulating oil due to bad o-rings placed around the top bolt, or through poor tightening at the air vent screw positioned at the top plate. Water content measurements of oils taken from installations in service, show that also liquid water can be present in the terminations. Full-scale examinations show that water droplets introduced at the top of an oil-filled cable termination are sinking in the oil and accumulates at the high field area close to the cable cone or at the surface of the housing. Droplets do also coalesce or repulse dependent on their intermediate distance. The partial discharges induced by the water are very intermittent and very low (or absent) for a long time even at very high water content. This indicates that alternative methods should be used to reveal the presence of water in oil filled cable terminations.
Sverre Hvidsten received his M.Sc at the University of Trondheim, and the Ph D in electrical engineering from the same university in 1999. Currently he is with SINTEF in Norway. His main field of interest is polymer ageing and diagnostics. He also works in the field of high pressure properties of polymers in electrical equipment for oil exploitation.
- Subcommittee C - Cable Systems - Wednesday, October 20, 2010, 8:00 AM to 12:00 PM.
- 8:00 -8:10 AM - Chairman’s Opening Remarks and Announcements
- 8:10 – 8:40 AM - New Technique for Fault Location in Underground Medium Voltage Cable, by Lionel Reynaud, Instit de recherché d’Hydro-Quebec-Ireq
As with many major utilities around the world, fault location has traditionally been performed using a high-voltage surge generator (thumper) together with a time-domain reflectometer (TDR) for pre-location and a magnetic detector for precise location. The new fault location technique developed at IREQ (Institut de recherché d’Hydro-Quebec) provides an efficient pre-location even for very long lines or when branches are present. The new technique entails the following three steps: Computer Simulation of breakdown at regular intervals along the line, In-situ measurement of a real breakdown signal on the line using a surge generator, Comparison of the results of various simulations with the in-situ measurement so as to identify the simulation that most closely matches the measurement (the”best match”). - 8:40 – 9:10 AM - Thermal Grouts for HDD Installations, by Deepak Parmar, Geotherm, Inc.
Over the past two decades, installation of high voltage power cables in HDD or Guided Boring has become quite common. One major component in these installations is the use of ‘thermal grout’ in order to maintain high ampacity and to provide mechanical protection to the system. Excluding the ‘chemical grout’ the two most commonly used grouts on HDD projects are either cement based (hardening type) and bentonite based (non-hardening type). Each HDD installation is different and must be treated as a special case and thus, the grouts must be formulated to meet project specific, thermal, mechanical, flow (pumpability) and other requirements. The presentation will describe the HDD system components, grout mix designs (formulation), thermal/mechanical properties and some case studies. - 9:10 – 9:40 AM - Leak Detection Using PFT Tracer Technology, by Marcie Glass, Wasson-ECE Instrumentation
Detecting leaks in high voltage cables can be a costly and lengthy process, often requiring the excavation and freezing of large sections of cables. Increasingly, volatile prefluoronated tracer (PFT) compounds are being used as tagging agents to facilitate leak detection. Wasson-ECE Instrumentation has developed a mobile PFT analyzer for real time analysis of feeder oil leaks in underground oil filled cables. A dual trapping system in combination an Agilent Technologies Gas Chromatograph provides an ambient air sample every 100 seconds. The Tracer Analyzer can detect the background ambient concentration of various PFTs, including perfluoromethylcyclohexane (PMCH) and perfluorodimethylcyclohexane (PDMCH) isomers, which are accepted to exist globally from 0.6 to 10 fL/L. The analyzer mounted in a mobile lab and samples are taken by driving the system above underground feeders. Sampling is fully automated by Wasson-ECE’s control software and is interfaced with an electronic global positioning system (GPS). When the system detects an increase in the PFT level, signifying a possible cable rupture, an instrument alarm is sound and the leak point is marked on a map. This technology has been able to detect leaks in a matter of hours. The increase in leak detection efficiency can translate not only to cost savings, but also a smaller environmental impact from dielectric fluid contamination. - 9:40 -10:10 AM - XLPE Jackets for Medium Voltage Concentric Neutral Power Cables, by Bill Temple, General Cable
Crosslinked Polyethylene (XLPE) as a medium voltage cable jacket coupled with reduced copper neutrals provides better efficiency over the life of the cable through cooler operation, lower line loss and greater resistance to deformation.
Linear Low Density Polyethylene (LLDPE) has been the jacket material of choice for the North American Utility and Wind Power markets because of its good physical properties and relative low cost. As research goes into new materials, thermoset crosslinked polyethylene delivers designs that offer benefits that can’t be provided by thermoplastic materials.
Physical properties of XLPE jackets will be shown in comparison with typical values from standard LLDPE materials. Thermomechanical performance of three single conductors, trefoil in conduit, will be reviewed for both thermoset and thermoplastic jacket materials.
ICEA P-45-482 recognizes higher maximum temperatures for thermoset jackets during fault conditions, which allows for larger fault current capabilities for a given metallic shield area. This idea can lead to lower initial cable costs and decreased line losses, or increased fault current capability.
The principles discussed during the presentation will be directly applied to a case study considering a typical medium voltage wind farm construction and an equivalent construction with a crosslinked polyethylene jacket. - 10:10 – 10:30 AM - Break.
- 10:30 – 11:10 AM - Medium Voltage Underground Cable System Reliability, By Dr. Richard E. Brown, Quanta-Technology.
Many utilities have aging underground cable systems that are failing at an increasing rate. Unfortunately, aggressive underground replacement programs are often difficult to justify since it is difficult to know whether any specific cable section will fail in the near future. This presentation demonstrates how a large US utility justified an aggressive cable replacement program in its current rate case. This involved the development of cable failure rate models and system reliability models that can track expected reliability over a twenty year period for various replacement scenarios. The economics of cable replacement were then compared to other methods of achieving reliability improvement. - 11:10 – 11:50 AM - Qualification of Conductor and Screen Connection for High Voltage Cables, by Pierre Mirebeau, Nexans Energy
This presentation will point out the different stresses that are applied to the connection and the test frame that is able to validate the corrections versus the stresses. The cable system inside the power transmission network will be considered, and examples of tests will be given. - 11:50 – 12:00 PM - Vice Chair’s Closing Remarks.
- Subcommittee D - Generating Station Cables - Tuesday, October 19, 2010, 2:00 PM to 5:30 PM.
- 2:00 - 2:15 PM - Subcommittee D Business/Announcements
- 2:15 - 2:45 PM - Low Smoke Zero Halogen Cables by Eric Wall, Anixter
Low smoke, zero halogen compounds and cables claim improved fire performance and personnel safety. This paper will discuss the history of LSZH, present typical uses and compare LSZH with other compounds. Special attention will be paid to the relative toxicity of LSZH cables and the affect this has on application decisions. New possibilities for use will be investigated and arguments for and against LSZH in these environments will be made. - 2:45 - 3:30 PM - Performance Monitoring of Electric Cables at Nuclear Power Plants by Matthew McConnell, USNRC
This presentation will provide a brief overview of the U.S. Nuclear Regulatory Commission’s (NRC) recent efforts associated with electric cables at nuclear power plants. The structures, systems, and components (SSCs) operating in nuclear power plants will routinely be exposed to a variety of environmental and operational stressors that can produce aging and degradation mechanisms. Over time, the aging and degradation mechanisms caused by exposure to these stressors can result in degradation of the SSCs.
Electric cables are important nuclear power plant components that are used to supply electric power to safety-related systems and to interconnect the systems with their instruments and controls. The polymer materials used for the insulation and jacket materials for electric cables, cable splices, and terminations are susceptible to aging and degradation mechanisms caused by exposure to many of the stressors encountered in nuclear power plant service.
The speaker will describe actions the NRC has taken to address electric cable issues at nuclear power plants (i.e., electric cables that have been found submerged in water) and provide the status of regulatory guidance documents that relate to condition monitoring of electric cables. - 3:30 - 3:45 PM - Break
- 3:45 – 4:15 PM - Update to In Service Performance of EPR Cables Installed In The MLGW Electrical Distribution System by Robert Fleming, Kerite
Provides brief background relating to the decision to install EPR insulated cables rather than HMWPE and XLPE cables, 25 year performance history of EPR cables, and field aging studies performed at MLGW. - 4:15 – 4:50 PM - Standard Development Update for IEEE 1717 Fire Rated Cables Furnace Test by Gil Shoshani, Rockbestos-Surprenant
The purpose of the presentation is to educate Insulated Conductor Committee attendee’s about recent standard developments in regards to fire rated cables, the new IEEE test method and cable selection for the Petrochemical industry. The presentation will summarize the reasons for developing the new IEEE P1717, “Standard for Testing Circuit Integrity Cables Using a Hydrocarbon Pool Fire Test Protocol” that is under development at IEEE Insulated Conductor Committee. The focus of the standard is to harmonize and optimize all cable fire test standards with the goal of developing an industry-wide accepted test method for Fire Rated Cables. The presentation will also cover the recent updates in API 14 FZ “Recommended Practice for Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class I, Zone 0, Zone 1 and Zone 2 Locations” and the fire protection requirements in living quarters and areas that are subjected to a Hydrocarbon Fuel Fire. In addition, API 2218 “Fireproofing Practices in Petroleum and Petrochemical Processing Plants” and other related standards will be reviewed for updates including fire rated cable selection and fire test considerations. - 4:50 - 5:30 PM - Nuclear Plant Cable Aging Management Program Implementation Guidance by Gary Toman, EPRI
In 2010, EPRI issued two cable aging management program implementation guides for medium and low voltage cable. These guides were developed through multiple reviews by utility, manufacturer, and consulting personnel. The presentation will describe their content and expected use. The guides describe the scope of the aging management program and focus on cables subjected to adverse environmental and service conditions. Assessment and test methods are described along with acceptance and action criteria. While these guides were being developed, the US Nuclear Regulatory Commission performed multiple inspections checking for submergence of medium and low voltage cable and issued NUREG/CR 7000 and Draft Regulator Guide DG-1240. The relationship of these activities to the EPRI implementation guides will be described.
- Subcommittee F - Field Testing and Diagnostics - Monday, October 18, 2010, 10:00 AM to12:30 PM.
- 10:00 - 10:10 - Subcommittee & Working Group Business
- 10:10 - 10:35 - Application of Damped AC Voltages for Testing Power Cables by Ed Gulski, Onsite HV Solutions AG, Switzerland, Piotr Cichecki, Delft University of Technology, The Netherlands Frank de Vries, Alliander, The Netherlands
Routine HV tests are the most fundamental of all electric tests on cable insulation. Since the test voltage is higher than the rated voltage it is considered as an over-voltage test. It has been introduced many years ago (to find serious insulation defects) because the over-voltage test was the only available electrical test. A breakdown of the insulation may occur on the insulation weak-spot and it can be sometimes accompanied by pre-breakdown phenomena (in-homogeneity with local high E-field). Regarding electrical over-stress a balance is important between detecting serious defects and avoiding insulation damage.
Conform the international recommendations e.g. IEC 60840, IEC 62067, IEC 60141, IEC 60060-3, IEC60502 the on-site testing of new-installed, repaired or service age power cables can be done in different ways.
In this contribution basic considerations and field experiences of voltage testing using sinusoidal damped AC voltages (20Hz-300Hz) will be discussed. In addition following the discussions on Cigre and IEEE forum about the use of partial discharges, the effects of using PD will be pointed out. - 10:35 - 11:00 - Monitored VLF Withstand Tests Using Partial Discharge Approaches At HV & EHV Voltages, by Bruce Olson & Dave Boyer, HV Inc.
VLF tests are widely used for the assessment of MV (Medium Voltage) cable systems. Utilities worldwide are increasingly interested in extending VLF technology to system voltages up to 220kV. This presentation will focus on the development of a 200 kV peak mobile VLF generator and the integration of Tan Delta and Partial Discharge measurement equipment. The Case studies will cover approximately 140 km of cable tested over an 18 month period. - 11:00 - 11:15 - Break
- 11:15 - 11:40 - Utility Experience With VLF Withstand And Dielectric Loss Tests In Cincinnati by Chris Fletcher, Duke Energy
In 2005 Duke Energy began to investigate the potential benefits of cable diagnostic testing through participation in the Cable Diagnostic Focused Initiative (CDFI). Field testing in 2006 to the present, as part of the CDFI and by Duke personnel, has provided further evidence that cable system diagnostics could help the Company to improve service reliability and to maximize the value of cable system replacement budgets. The testing involved in these programs included Dielectric Loss, Monitored Withstand, Partial Discharge and Simple Withstand approaches.
Many positive results from these trials led Duke Energy to implement a medium voltage underground cable system diagnostic program in 2008. The program presently involves the use of Time Domain Reflectometry, Dissipation Factor (Tan Delta) Measurement, and Very Low Frequency Withstand. This program continues to demonstrate the value of cable system diagnostics by prioritizing cable replacements, identifying cable segments that do not need to be replaced, and identifying cable and cable accessories that were about to fail while in service.
The cable system diagnostic programs are underway in three different regions. This presentation will discuss some of the experience that the Duke Energy has gained with its cable system diagnostic program. The talk will also identify some of the benefits that have been received. - 11:40 - 12:05 - The use of pulse shape in PD testing of cable systems at VLF Diagnostics by Luigi Testa, G. C. Montanari, A. Mendelsohn TechImp, Italy; University of Bologna, Italy & Power Delivery Solutions, USA
High-pot VLF testing of power cable systems is a widely used technique for the condition assessment of Medium Voltage networks, recently applied also to High Voltage systems. Combining Partial Discharge (PD) measurement with VLF test provides a powerful diagnostic tool able to spot the presence of local defects which may not break down the insulation during the high-pot test. On the other hand, PD testing at VLF requires advanced noise rejection techniques to be employed. In fact, while PD under VLF voltage have much smaller repetition rate (pulses per second) than at power frequency, electromagnetic noise and external disturbances are present as well.
This presentation focuses on the application of Ultra Wide Band (UWB) approach to PD measurement at VLF, showing that on-line pulse selection based on PD pulse characteristics (in time and frequency domains) allows separation of signals coming from different sources to be performed, in order to focus only on PD activity coming from the cable system under test.Further information relevant to the type of defect, such as the PD source location and identification, can be extracted from PD measurement using this approach. - 12:05 - 12:30 Field Testing of HV Extruded Cable Systems – The Experience with Frequency - Tuned Resonant Systems by Wolfgang Hauschild, Peter Coors & John Herron, HIGHVOLT Prueftechnik & Reinhausen Manufacturing Inc.
Abstract: Field testing of extruded HV cable systems is performed after laying to demonstrate the sufficient quality of the assembling work as well as after years of operation to assess the condition of the cable by a diagnostic tests. In both cases a combination of withstand testing and partial discharge measurement is recommended and delivers reliable test results.
Following the general principle of HV testing, that the test voltage shall represent a typical stress in service, an AC test voltage of a wider frequency range of 20 to 300 Hz has been selected for field tests more than 10 years ago (e.g. IEC Standard 62067). Such AC test voltages are very efficiently generated by frequency-tuned resonant test systems (ACRF systems) based on static frequency converters. Meanwhile more than 100 mobile ACRF test systems are operating worldwide.
The contribution describes the experience with such ACRF test systems, such as the parallel and series connections of test systems, testable length of cable systems, really applied frequencies (much narrower than 20 to 300 Hz), PD noise level, transportability, etc. Although outside the main area of this talk some brief comments can also be made on the application of ACRF test systems for HV factory testing of super-long submarine cables.
- Transnational Luncheon - Tuesday, October 19, 2010, 12:15 PM to 2:00 PM, Ticket Required.
- 1. Opening by Wim Boone
- 2. Change of Vice Chair
- 3. Calendar of international events, Wim Boone
- 4. A future grid of extruded DC cables, Johan Karlstrand, ABB Sweden
- 5. Installing a long distance HTS cable circuit in the Netherlands, Jacco Smit, Alliander, NL
- 6. Modern tools for HV and MV on-site cable testing, Henning Oetjen, HDW USA
- 7. A 1000MW 500kV HVDC Very deep water submarine cable interconnection, Marco Marelli, Prysmian, Italy
- 8. Type test 500kV XLPE cable system, Jy Woo,Taihan Electric USA
- 9. Accessory Workmanship, Henk Geene, NL
- 10. News form Jicable, Ray Awad, Hydro Quebec
- Educational Program - Design Principles for Cable Accessories (Separable Connectors, Joints and Terminations) - Wednesday, October 20, 2010, 1:00 PM to 5:00 PM.
- Introduction
- Cable and Accessory Design by Matt Spalding, TYCO Electronics
This presentation will discuss the key design parameters of solid dielectric cables and their accessories. It will also cover the typical operating stresses and address the considerations for designing reliable accessories. The importance characteristic requirements for accessories will be presented. The presentation will also review the applicable test standards available for evaluating performance and highlight the existing industry standards’ possible shortcomings. - Failure Analyses of Cable Accessories by Dean Williams, NEETRAC
This presentation will outline the overall process for an effective analysis by describing the information gathering of the appropriate history, typical methods used, and describe the importance of collation of findings. It will also include a number of practical examples of cable system accessory analyses and demonstrate how feedback can improve installation, design and procurement. It will also address in detail the critical steps to be considered by a utility when implementing a cable/accessory forensic analysis program. - Paper-Insulated Lead Covered Distribution Cable and Accessories Designs by Bill Taylor, 3M Corporation
This presentation will provide the background of Paper-insulated Lead covered cable (PILC), including where and why splices are used. The presentation shall include things to consider when designing a joint for a transition, such as electrical stress, mechanical and thermal issues, etc. It will discuss what manufacturers/product developers consider in their design to achieve a long life product, taking into account low and high loads, etc. The presentation will also cover the importance of test standards and their applicability and the nature of additional testing that is normally considered to develop a reliable and long-life product. - Cable System Evaluation – An Asset Manager’s perspective (or Dilemna!) by Dexter Tarampi, BC Hydro
BCH has distribution cables and accessories that are approaching end-of-life. Just like any other utility faced with limited resources and budget constraints, in 2004, BC Hydro developed a repair/ replace strategy based on an integrated approach to determine the condition of their cable assets. This presentation will cover the challenges encountered to successfully implement such a program. It will discuss some of the strategies examined and the nature of tests that were applied to assess these assets. Some of the types of problems with cables and cable accessories shall also be presented.
NEW! 0.4 CEUs will be offered for this session. You must register in order to receive CEUs. (Please note, in order to receive these credits towards a Florida PE License, you MUST provide Thomas Arnold with your FL PE License number prior to the session.
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