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Burnt out Cable Connection on 100kW inverter

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R

RCherry

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Hoping someone can give some input on what could be possible causes of what happened here. I am going to investigate the situation next week but for the time being I am trying to get as much input as possible to possible causes .

The install consists of 7x 100kW Huawei Grid Tied Inverters ,the system has been running smoothly for the past 9 months, faults came through on the monitoring platform and when an technician was sent out this is what was found .

My first and quite frankly only reasonable explanation is a loose connection ,but ,to the best of my knowledge a loose connection would have burnt out locally (at the point of termination where cable was loose ) . But in these pictures the cable is burnt out both at the inverter and then all the way back to the circuit breaker in the distribution board .

Any other ideas would be greatly appreciated and if my thinking about "localised" damage is incorrect if someone could explain otherwise that would also be greatly appreciated.
 

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A sustained overcurrent could cause the damage you are seeing.
 
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Just watched the vid again, I think you are right, there is some shiny stuff there possibly from arcing between the 2 terminals.
I wonder if there is any animal parts that have been well cooked between the terminals that started an arc going?
 
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So the 'apparent' short is at the inverter and your fourth image is the mccb. To me a short has occurred at the inverter and tripped the mccb with the conductors contaminated by vaporized copper exhausted by the mccb.
 
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Well ,I say sealed but what I mean by that is sealed from natural elements . Also very unlikely that someone tampered with it because only 3 people have keys to the inverter location and it would be in none of their best interests to even enter the cage for any reason other than if there was a problem. I guess I will hopefully find my answer when I go investigate for myself during the week
 
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