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500 V 125 Amps fuse body getting overheated(80 c) in only L1 Phase issue.

Rohit Sharma

Hello All Team Members,

We have one 3phase SFU fuse unit feeder in 400V LV distribution panel. This feeder feeding to load which having thyristor (IGBT) control heaters with 70 amps full load capacity. 

When we switched ON this SFU unit to supply 3 phase 410 VAC power supply to load then after some time the fuse body temperature of L1 phase has reached up to 82 deg. Celsius...while other L2 & L3 fuse temperature were around 62 deg. only... & checked the three phase Current & voltage which were L1 - 66 amp, L2 - 66,6 amps , L3 - 67,7 amps & V1& 2 - 404,8 V, V2&3 - 404,9 V, V3&V1 - 405,3 V. 

Same time checked the 3 core cable temperature which was around 37 deg only. 

All three fuses also replaced with new one. Fuse type is NH00, Make - EFEN. 

Kindly share your valuable comment. 

Parents
  • 0

    Have you checked that the connections have been properly torqued (etc)? If you have access to a micro-Ohmeter I'd be inclined to quickly measure across the terminals to check that they are consistent which should also verify that the fuses are intact.

    Why was the temperature measurement being made... Is there some other issue being checked for? Have you ruled out optical effects (e.g. reflections)?

    Is there a neutral or is it 3W only?

    I'd suggest asking the forum mods to move this to the Wiring & Regulations section since while strictly off topic it's better frequented by people who know more about this kind of issue than me.

Reply
  • 0

    Have you checked that the connections have been properly torqued (etc)? If you have access to a micro-Ohmeter I'd be inclined to quickly measure across the terminals to check that they are consistent which should also verify that the fuses are intact.

    Why was the temperature measurement being made... Is there some other issue being checked for? Have you ruled out optical effects (e.g. reflections)?

    Is there a neutral or is it 3W only?

    I'd suggest asking the forum mods to move this to the Wiring & Regulations section since while strictly off topic it's better frequented by people who know more about this kind of issue than me.

Children
  • 0 in reply to Jam

    Thanks Mr. Jam, This is 3phase load without neutral. You had mentioned about Optical effect.. could you pl tell me bit more about it so that i can check at my end. 

    Regarding your forum suggestion i shall change it. 

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