Switching transient in low voltage system

surreysearch · May 27, 2004

I'm looking for a guideline value for maximum switching transient voltage allowed in a single-phase low voltage (240V) motor. The switch can be simple device of complicated relay/PLC system.
What would be the tolerable transient on single-phase 240V motor winding? What value do manufacturers and commercial users use as guidelines?
Appreciate any guidance towards relevant standards.
Thansk

BrianR · Jul 25, 2004

There is no simple answer to this question as the requirements deal with electromagnetic emissions, transient rise times and the nature of the installation. It is not a "Voltage Limit" type spec.

However these standards will cover much of what you need:
VDE 0160, 0433
VG 95370, 95371, 95373
MIL-STD-704
MIL-STD-461
IEC-60, 255

jraef · Jul 27, 2004

It is also no longer universal to all motors. VFD use has spawned a new trend to go with higher insulation values on motor windings, but that relates to 3 phase motors since that is where VFDs are used. I'm not sure about 1 phase designs.

"Venditori de oleum-vipera non vigere excordis populi"

buzzp · Aug 9, 2004

VFD's are also used on single phase motors as well, although not as common.

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Switching transient in low voltage system

surreysearch

Electrical

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