I would like to know if
you or your members might be able to help me one more time.
I am the Manager of a large Data Center electrical infrastructure, we
are in the process of installing a new UPS system. As a temporary feed
to the data center we are using a Cutler- Hammer 800A molded case switch
in a motor control center configuration. Since we cut over to this
switch I have noticed a vibration and hum very similar to a 60 cycle
transformer, coming from this switch and enclosure. We have contacted
the vendor and have taken infrared pictures and vibration analysis, to
no avail. The load is evenly balanced across all three phases at about
300 amps. We have current harmonics averaging 20% and voltage harmonics
averaging 6% across the phases. I wondered if you or any of your readers
have ever experienced this.
you or your members might be able to help me one more time.
I am the Manager of a large Data Center electrical infrastructure, we
are in the process of installing a new UPS system. As a temporary feed
to the data center we are using a Cutler- Hammer 800A molded case switch
in a motor control center configuration. Since we cut over to this
switch I have noticed a vibration and hum very similar to a 60 cycle
transformer, coming from this switch and enclosure. We have contacted
the vendor and have taken infrared pictures and vibration analysis, to
no avail. The load is evenly balanced across all three phases at about
300 amps. We have current harmonics averaging 20% and voltage harmonics
averaging 6% across the phases. I wondered if you or any of your readers
have ever experienced this.