TASK 2 Which of these statements about Electromagnetic compatibility (EMC) are t

ID: 2267980 • Letter: T

Question

TASK 2

Which of these statements about Electromagnetic compatibility (EMC) are true or false?

a) Common-mode voltage induced current is usually DC by nature

b) Replacing IGBTs with GTOs as the inverter switches will improve the power quality (less noise) and improve the efficiency of the drive

c) Component layout of the power converter does not affect the EMI coupling, just the switching speed

d) With a six-pulse rectifier, the grid current will meet the grid standards for a kilowatt range motor inverter without a grid filter

e) EMI is usually invisible for the converter measurement (for example DC link voltage, output current)

f) Motor bearing currents are harmful for the motor, but will not conduct any noise to the surrounding equipment.

g) Modulation strategy of an H-bridge feeding the grid will affect the generated common-mode voltage

h) A common-mode choke placed at the inverter output will eliminate motor terminal overvoltage

i) In power converter, increasing the distance between two wires is a good option to remove noise coupling.

j) The frequency content of a PWM controlled output voltage is defined only by the fundamental (modulating signal) and the carrier frequencies

a)true . the common mode induced current is DC in nature

b) true .gto is used in high power application, which has greater power quality maintaing capacity

c)false . layout of component affect EMI

d)true . with six pulse rectifier an inverter canconnected to grid without filter

e)true . An invisible equivalent circuit of the converter is formed by intentional components and parasitic components

f)false . motor bearing current will conduct noise to surronding equipments too

g)true . modulation strategy will affect the generated common-mode voltage

h)true . to eliminate motor terminal overvoltage a common mode choke can be placed at the inverter output

i)true . increasing distance between components remove noise

J)true . by comparing fundamental and carrier signal PWM pulse is obtained . the frequency is only depends on both

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