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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

    The most likely causes in my view are either an overload or very heavy loading that was not present when you took the current readings. Or poor  connections between the fuse link and the fuse carrier, or between the fuse carrier and the base, or between the fuse base and the external conductors.

    Another less likely possibility is high frequency or harmonic currents that are not accurately shown by whatever instrument was used to measure the current. Not likely to affect only one phase, but possible.

Reply
  • 0

    The most likely causes in my view are either an overload or very heavy loading that was not present when you took the current readings. Or poor  connections between the fuse link and the fuse carrier, or between the fuse carrier and the base, or between the fuse base and the external conductors.

    Another less likely possibility is high frequency or harmonic currents that are not accurately shown by whatever instrument was used to measure the current. Not likely to affect only one phase, but possible.

Children
  • 0 in reply to broadgage

    Thanks Mr. Broadgage for your reply. Can harmonics effect only one phase out of three phase....Will try to check the all fuse links. 

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