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w0148360
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Join Date: Feb 2010
Posts: 2

Phase Loss

02/23/2010 2:37 PM

what happends when you lose a phase (i.e) blown fuse or something similar

in a wye connection in a line side and what happens when you lose a phase in the load side of a wye?
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wareagle
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#1

Re: Phase Loss

02/23/2010 6:06 PM

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PWSlack
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#2

Re: Phase Loss

02/24/2010 2:56 AM

On a supply to a motor, expect either the motor overload protection device or the circuit protection device of one or both of the other two phases to operate as well.

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jannel
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Join Date: Jan 2010
Posts: 8
#3

Re: Phase Loss

02/24/2010 11:39 AM

Single phasing takes place. Should the load be a motor, it will stop rotating and "hum" until the o/l trips. In a resistive load i.e. lighting situation, some lights will be out.
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msamad
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#4
In reply to #3

Re: Phase Loss

02/24/2010 1:52 PM

The previous thread http://cr4.globalspec.com/thread/40007 will also help.

- MS

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w0148360
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#5

Re: Phase Loss

02/24/2010 7:58 PM

thanks guys
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Previous in Forum: Motor Protection Relay (MPR)   Next in Forum: Installing 50 Hz 200 KVA 3 KV transformer in 60 Hz system
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