A few points to mull over...
I seriously doubt you have a fault current of 11.1ka in a single phase domestic property even next door to the transformer. Can you borrow someone elses loop tester to verify, the impedance is likely to be low, but not that low!, the accuracy of loop testers isn't that great as the PFC gets higher, and some makes fare better than others.. That 11kA value you quoted corresponds to 0.02 ohm ish. I've only ever seen it that low is when testing at a main switchboard, connected via 2-3 metres of transformer unloading tails to a 1000kva tx within spitting difference! If you can estime the length and size of DNO supply cable from the position of the tx, you might get a more realistic value.
I've seen the kewtech meters come up with strange values, I've seen an impedance of 0.05ohm from one guys meter, when the value was more like 0.14 ohm
I seriously doubt you have a fault current of 11.1ka in a single phase domestic property even next door to the transformer. Can you borrow someone elses loop tester to verify, the impedance is likely to be low, but not that low!, the accuracy of loop testers isn't that great as the PFC gets higher, and some makes fare better than others.. That 11kA value you quoted corresponds to 0.02 ohm ish. I've only ever seen it that low is when testing at a main switchboard, connected via 2-3 metres of transformer unloading tails to a 1000kva tx within spitting difference! If you can estime the length and size of DNO supply cable from the position of the tx, you might get a more realistic value.
I've seen the kewtech meters come up with strange values, I've seen an impedance of 0.05ohm from one guys meter, when the value was more like 0.14 ohm
