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High and low voltage 3 phase system
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<blockquote data-quote="refael" data-source="post: 541228" data-attributes="member: 36250"><p>Hey guys wanted to post a very interesting situation I've come across maybe someone will know more about it.</p><p></p><p>This is a 3 phase system with a neutral and earthing via ground rod</p><p></p><p>When I test beetween all phases and neutral or phases and earth everything is normal</p><p>However there is one circuit that when turned on causes the voltage on one phase to rise and one phase to go lower (im talking a 30 to 60 volt difference) this changes acording to what you plug in. The heavier applience the bigger the drop.</p><p>It also causes a potential of anywhere up to 40 volts depending again on how heavy the load.</p><p>If anyone here would have any ideas of what could have caused this will really appreciate any help.</p><p></p><p>If you need any more details feel free to ask and as a side note i asked the homeowner to get a 2nd opinion however unfortunately the electrician wouldn't listen to the testing i had done and is convinced its an earth problem on the whole house (which it obviously isn't because when the circuits off everything reads normal)</p><p></p><p>Thanks refael</p></blockquote><p></p>
[QUOTE="refael, post: 541228, member: 36250"] Hey guys wanted to post a very interesting situation I've come across maybe someone will know more about it. This is a 3 phase system with a neutral and earthing via ground rod When I test beetween all phases and neutral or phases and earth everything is normal However there is one circuit that when turned on causes the voltage on one phase to rise and one phase to go lower (im talking a 30 to 60 volt difference) this changes acording to what you plug in. The heavier applience the bigger the drop. It also causes a potential of anywhere up to 40 volts depending again on how heavy the load. If anyone here would have any ideas of what could have caused this will really appreciate any help. If you need any more details feel free to ask and as a side note i asked the homeowner to get a 2nd opinion however unfortunately the electrician wouldn't listen to the testing i had done and is convinced its an earth problem on the whole house (which it obviously isn't because when the circuits off everything reads normal) Thanks refael [/QUOTE]
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High and low voltage 3 phase system
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