BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Australian Tunnelling Society - ECPv6.15.20//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://australiantunnellingsociety.com.au
X-WR-CALDESC:Events for Australian Tunnelling Society
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Australia/Melbourne
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20250405T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20251004T160000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20260404T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20261003T160000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20270403T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20271002T160000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VTIMEZONE
TZID:Australia/Brisbane
BEGIN:STANDARD
TZOFFSETFROM:+1000
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20250101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Australia/Melbourne:20260513T173000
DTEND;TZID=Australia/Melbourne:20260513T183000
DTSTAMP:20260505T214845
CREATED:20260330T020114Z
LAST-MODIFIED:20260330T020114Z
UID:269673-1778693400-1778697000@australiantunnellingsociety.com.au
SUMMARY:Choosing the right VSD for tunnel ventilation application
DESCRIPTION:Overview\nIn recent years\, several tunnel projects have faced serious setbacks due to catastrophic motor failures. These failures are caused by high peak voltages\, a result of using Active Front End (AFE) VSDs combined with long motor cable lengths\, extending to 500 meters. This session examines the underlying electrical phenomena contributing to these issues and why conventional mitigation methods\, such as standard filters\, are often insufficient. \nParticipants will gain practical insight into proven engineering solutions that deliver near-sinusoidal voltage at the motor terminals\, reducing stress on insulation and extending asset life. Drawing on real-world case studies and field testing\, the session highlights key design considerations\, specification pitfalls\, and lessons learned to support more reliable tunnel ventilation system performance. \nLearning outcomes\nIn this event\, attendees will be able to: \n\nidentify the root causes of high peak voltages in AFE VSD tunnel applications\nevaluate why conventional filtering methods may not adequately protect motors apply practical design and specification strategies to prevent premature motor failure\nselect VSD and mitigation solutions that improve reliability and extend asset life\n\nProgram\nIn-person: \n\n5.00 pm AEST: Guest arrivals and registrations\n5.30 pm AEST: Presentation begins\n6.15 pm AEST: Q/A begins\n6.30 pm AEST: Event close\n\nOnline: \n\n5.30 pm AEST: Presentation begins\n6.30 pm AEST: Presentation ends\n\nAbout the speakers\n\n\n\nJoris Feekman\nRegional Sales Manager\, Danfoss Drives\n\nJoris is Regional Sales Manager at Danfoss Drives\, with over 25 years of experience in electrical drives and industrial power conversion. He has experience across Europe and Australia\, delivering reliable motor control solutions across a wide range of industrial applications.\n\n\n\n\n\n\n\n\nHusain Natalwala\nBusiness Development Manager\, Danfoss Drives\nHusain has strong experience supporting large-scale industrial and infrastructure projects\, with exposure to Industrial Automation and Electrical Systems. At Danfoss\, he works as a BDM focussing on Tunnel Ventilation\, Water and Food Industries.
URL:https://australiantunnellingsociety.com.au/ats-event/choosing-the-right-vsd-for-tunnel-ventilation-application/
LOCATION:Online and in person at EA Melbourne\, Level 26\, 181 William Street\, Melbourne\, VIC\, 3000\, Australia
CATEGORIES:Online,Victoria,Webinar
ATTACH;FMTTYPE=image/png:https://australiantunnellingsociety.com.au/wp-content/uploads/2026/03/Screenshot-2026-03-30-130022.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Brisbane:20260604T180000
DTEND;TZID=Australia/Brisbane:20260604T190000
DTSTAMP:20260505T214845
CREATED:20260505T005210Z
LAST-MODIFIED:20260505T005210Z
UID:291886-1780596000-1780599600@australiantunnellingsociety.com.au
SUMMARY:The ground investigation for a storage cavern in metamorphic rock at 600 m depth
DESCRIPTION:Overview\nThis presentation describes the processes used in the investigations for a deep compressed air storage cavern in a complex metamorphic environment. The exploration process involved drilling using HQ-3 coring techniques from surface and also from an adjacent underground mine. The latter were two 460 m boreholes drilled just sub horizontally across the planned cavern location. \nThe core from these holes was logged for structure and sampled for rock property testing. Because a significant portion of the rock was highly anisotropic the test methods used had to be adapted. This included alternative ways of working with point load testing\, triaxial testing for anisotropy of moduli and some special shear tests.  Because of the importance of determining potential leakage of groundwater into the cavern\, or of air out of the cavern\, the correct measurement of the ground fluid pressure and the permeability of the rock mass were extremely important. \nTesting had to be conducted in stages to cover the entire length of the holes. The method used was to fit the drill rods with a straddle packer assembly\, downhole valve system and suitable precision pressure monitoring with operator read out. First the test zone was shut in to recover pressure. This was followed by a period of injection or production which was followed by another shut in period. These tests followed oilfield practice but with tools designed to work with HRQ drill rod and used horizontally. \nThe rock stress was determined by the use of three dimensional overcore tools used up to 441 m laterally. Other techniques could have also been advantageously used to fill in the sparse overcore data in the extremely complex geological environment. The vertical and the horizontal holes were logged using both acoustic televiewer and full wave sonic sondes. \nThe conclusions of the study were that the rock mass was heterogeneous but fit for purpose provided that the correct design decisions were made. The presentation also looks at what can be achieved from open hole drilling test techniques compared to coring and the comparative costs of these. This has particular relevance to tunnel investigations. \nProgram timeline\nOnline \n6.00pm – Presentation commences \n7.00pm – Presentation concludes \nIn-Person \n5.30pm – Registration\, networking & catering \n6.00pm – Presentation commences\, networking \n7.00pm – Event concludes \nLearning outcomes\n\nYou should gain an appreciation of the importance of geology.\nYou will gain an understanding of the methods used to determine the states of stress in rock and the measurement of anisotropic rock properties.\nThe methods used and the importance of determining fluid pressures and permeability properly are extremely important and should totally replace conventional packer testing.\n\nAbout the speaker\n\n\n\nIan Gray\nManaging Director\, Sigra Pty Ltd\n\nDr Ian Gray is the managing director of Sigra Pty Ltd\, a role he has held for 32 years. In his career he has had the roles of mining\, civil\, geotechnical and reservoir engineers\, engineering geologist and hydrogeologist. He has worked in 20 countries dealing with mines\, tunnels\, slopes\, petroleum reservoirs and anything else in the ground. One of his passions is actually measuring things in the ground properly. To do this he has developed a suite of equipment and techniques. He also works with a variety of drilling systems.
URL:https://australiantunnellingsociety.com.au/ats-event/the-ground-investigation-for-a-storage-cavern-in-metamorphic-rock-at-600-m-depth/
LOCATION:Online and in person at: Level 9\, 340 Adelaide Street\, Brisbane
CATEGORIES:Online,Queensland,Webinar
ATTACH;FMTTYPE=image/png:https://australiantunnellingsociety.com.au/wp-content/uploads/2026/05/Screenshot-2026-05-05-105122.png
END:VEVENT
END:VCALENDAR