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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. 

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  • 0

    Be careful with infra-red guns firing at things that are not perfectly matt black - what is measured will be a mixture of the heat radiated from the object itself and reflected heat from other objects, perhaps  outside the box, forming  a 'mirror image' in the surface of the object (not a visible mirror image of course, but an infra-red one - and some items have more or less infra red reflection than they do in the visible wavelengths.).  It is harder to do but more reliable to verify with a contact measurement in cases where there  is  doubt. Also is it like your photo, where L1 is on top ? If so it may be nothing more serious than it is being pre-heated by the ones below.

    Mike

  • 0 in reply to mapj1

    521.5.1?

    Z.

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