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Drive ProductsModule 21 Page 1

ComparisonComparison

MV with LV DrivesMV with LV Drives

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Subject of comparison

MV 3.3 kV withLV 0.69 kV

in the power range of 710 kW to 2800 kW

Remark: The power range below 710 kW was not considered

because MV drives have usually a 12 pulse topology (or higher)

and LV drives are only 6 pulse

Comparison MV with LV Drive

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Cubicle length in meter

The LV cubicle is longer than the MV cubicle

Cubicle length in meter

0

1

2

3

4

5

6

7

8

9

0 500 1000 1500 2000 2500 3000

Motor Power in kW

Meter

LV

MV

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The LV footprint is bigger than the MV

footprint

Cubicle footprint in square meter

Cubicle footprint in square meter

0

1

2

3

4

5

6

0 500 1000 1500 2000 2500 3000

Motor Power in kW

Squaremeter

MV

LV

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MV weighs less than LV

Cubicle weight in kg

Cubicle weigth in kilogram

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

0 500 1000 1500 2000 2500 3000

Motor Power in kW

Kilogra

MV

LV

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MV Converters alone are more expensive

than LV

Converter prices in units

Converter transfer price in units

0

50000

100000

150000

200000

250000

300000

0 500 1000 1500 2000 2500 3000

Motor Power in kW

units

LV

MV

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MV Motor prices are almost identical to

LV Motor prices

AC Motor prices in units

Prices of AC Induction Motors

0

20000

40000

60000

80000

100000

120000

0 500 1000 1500 2000 2500 3000

Motor power in kW

Transferprice

inu

nits LV

MV

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MV Transformer prices are almost

identical to LV Transformer prices

Transformer prices in units

Transfer price in units of oil transformers for converter supply

0

10000

20000

30000

40000

50000

60000

70000

80000

0 500 1000 1500 2000 2500 3000Motor power in kW

units

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Motor Cable Costs

Comparison between LV and MV motor cable costs

0

10000

20000

30000

40000

50000

60000

0 500 1000 1500 2000 2500

MW

Units

LV Cables are approx. 4-8 times more expensive

than MV Cables

LV

MV

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MV Converter losses are approx. 30%

lower than LV Converter losses

Converter losses in kW

0

10

20

30

40

50

60

70

80

90

0 500 1000 1500 2000 2500 3000

Motor Power in kW

units

MV at 100% load

LV at 100 % load

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System Prices in units

-100000

-50000

0

50000

100000

150000

200000

250000

300000

350000

0 500 1000 1500 2000 2500 3000

Motor power in kW

LV-MVsystem

pricesinunits

cable length 25 m

cable length 50 m

cable length 100 m

cable length 200 m

cable length 300 m

System means Transformer, Converter, Motor, Motor cablewith a loss evaluation over an operating time of 10 years

Above zero line= MV is cheaper

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Summary 1

MV Cables are about 4-8 times cheaper

than LV Cables.

The space requirement for MV cables is

much lower

MV Cable laying and connecting costs

much less than for LV Cables

Comparison MV with LV Drive

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Summary 2

A MV Drive system ( transformer,

converter, motor and motor cables) must

be seriously considered as an alternative

to LV at 500 kW and above

Comparison MV with LV Drive