7/22/2013 6:32 AM | |
Posts: 262 Rating: (45) |
Hi, Single phasing protection is defined in IEC60947-4 where as the ACBs comes under IEC60947-2, since ACBs are not a motor protection device it doesn't have 2-pole chararcteristics to provide single phasing protection even with the highest release. Also, conneciton of undervolatge happen with one phase and one neutral so, in any that case if the voltage of that phase goes down ( phase lost to another pole) than it may trip on undervoltage. It should not be termed as single phasing. For single phasing, please use 3UG relays in specific motorfeeders or incomer ACB( as required) Attachment3UG_Single Phasing.pdf (870 Downloads) |
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5/24/2014 6:50 AM | |
Posts: 235 Rating: (52) |
Dear @nkur Its realy a good qeustion wheather one can use a shunt coil inplace of closing coil vice versa? Answer is yes you can use vice versa.Please find the attached sheet for more clarification in which you can show that the part no of closing and shunt trip coil are same the difference is that where you put same in ACB.In ACB their are different solenoid or say mechanical mecanism to close or trip the ACB.If unfortunatly u will oreder two closing or two triping coil for one ACB then dont worry u can use one as a closing and another as triping coil.Also note that this are same for 3WL and 3WT ACB. Hope you goy the answer what u want to know. Regards Idrajit gohil Attachment3WT ACB.pdf (889 Downloads) |
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