stepup stepdown
TRANSCRIPT
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15.11.2005 1
VACON STEP-DOWN STEP-UP SOLUTION
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15.11.2005 2
Heikki Salo
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15.11.2005 3
Heikki Salo
~ M~
M~
Pump or fan
~
How to control medium voltage motor
1. Step down transformer 6/0.4 kV or 6/0.69 kV2. Frequency converter Vacon CXC / NX3. Vacon sinus filter4. Step up transformer 0.4/6 kV or 0.69/6 kV5. 6 kV motor
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15.11.2005 4
Heikki Salo
• Pump motor• 630 kW• 6 kV• 72 A
Water treatment plant
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Heikki Salo
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Heikki Salo
800 kW frequency converter for motor test bay
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Heikki Salo
• Frequency converter for motors- 55...500 kW, 400 V- 250..800 kW, 690 V- 250..800 kW, 6 kV and 10 kV via step up trafo- squared torque applications
• No load net voltage 764 V +10%,-15%- UkNettrafo = 4%, UkStep up = 4%, UkFilter = 2%
• Maximum losses at full load- Vacon: 24 kW (=3%)- Filter : 2.2 kW
• Fundamental wave content of output voltage 95%THD < 10%
• Low net voltage distortions by net harmonics
Main customer requirements
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Heikki Salo
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15.11.2005 9
Heikki Salo
800 kW, 690/400 V, 880 Afrequency converter
Block diagram
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Heikki Salo
Net current, transformer primary side, full load 800 kw
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Heikki Salo
Phase to earth voltage Uu1 before the sinus filter
Phase to earth voltage Uu2 after the filter
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Heikki Salo
Output after the sinus filter at full load,800 kW, 690 V
Output voltage after the filter: 500 V, 2 ms per div
Output current after the filter: 500 A, 2 ms per div
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15.11.2005 13
Heikki Salo
Output voltage and current at different frequencies
50 Hz 30 Hz
20 Hz 10 Hz
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15.11.2005 14
Heikki Salo
What is the maximum peakvoltage after the filter fromphase to earth
Phase to phase voltage U31and current after the filter
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Heikki Salo
Is there a phase shift between filter in and output
Phase to earth voltage after the filter
Voltage before and afterthe filter together
==> no phase shift
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Heikki Salo
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Heikki Salo
• Vodokanal of St. Petersburg
Four units with step-down transformers, 630 kW FC and motor 690 V.
• Pskov
Two units of step-down/step-up transformers and 630 kW frequency converters for main feeder pumps at a district heating plant.
• Tatarstan
Pumps for 16 units step-down/up -solution 315 kW up to 900 kW. District heating pumps.
• Yakutia
2 units 1000 kW step-down / step-up for 6 kV pump motors.
References • BelarusPower plant pump, 630 kW, 6 kV with step-down / up transformers.
• LithuaniaDistrict heating plants one unit for 630 kW, 6 kV motor; a step-down / step-up transformer and frequency converter and same solution for 315 kW, 6 kV motor.
• PolandPower plant 800 and 1100 kW main feeding pumps 6 kV Step down / step up –solution.
• EstoniaTarto district heating plant 500 kW 6 kV motorStep down / step up solution with existing oil-immersed transformers.
Both 12-pulse and 6-pulse applications are used in the
above mentioned cases
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Heikki Salo
THANK YOU