Lennart Mukka Master of Science in Electrical Engineering 1975 at Royal Institute of Technology in S

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Lennart MukkaMaster of Science in
Electrical Engineering1975 at Royal Institute of
Technology in Stockholm. For the moment
supervisor electrical eng.for the new
pelletising plant in KirunaRepresenting the
Swedish National Committe of CIRED viaFIE (The
Swedish societety for electrical
engineering)Member of the Swedish national
technical committe for TC 44representing FIE
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• 3.700 employees
• iron ore products 2006, 23.3Mtons
• about 3 of the world iron ore production
• turn over 2006 15 billions SEK
• profit 2006 6.4 billions SEK

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Structure of the production
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• 260 MW
• 1.7 MWh/year
• 1.3 of Swedens electricity consumption
• 90 is used to supply electric motors
• El. energy forms about 11 of the total cost

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Former open pit of Kiirunavaara mine
Summer 2004
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Single line diagram
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Reactive power correction and harmonic filtering
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Reactive power correction and harmonic filtering
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Disturbing or difficult loads
Mine hoists driven by large thyristor controlled
DC drives
Load cycle is approximately 90 s Acceleration
phase, operation at full speed and
retardation During that time the load is
changing between 0 and 9 MVA Causing voltage
variation on the feeding bus-bar and in the PCC
at the 130 kV bus-bar
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Mine hoist load cycle
U
P
Q
I
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Disturbances on the distribution system
Loss of revenue due to production outages caused
by voltage dips in the electrical system.
Production outage in Kiruna operation costs
approx. 30 kEUR per hour in lost profit
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Voltage dips at LKAB in Sweden Analysis of dip-
and outage statistics, mitigation options and
economical effects

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Disturbances on the distribution system
Tuesday Poster session 2 Block 4 Paper0204
Thursday Session 2 Block 4 Paper0204
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Thank You for your attention!