HMMMMMMM a typical 3 phase 4 wire Y HV primary service is 12470 Y 7200, They would have 7200 volts from line to neutral (which is tied to mother earth) and they could use one phase for a 7200 to grounded Neutral single phase run to your home. (all speculation so far mind you)
The 7200 volts is from Line to Neutral (which is tied to earth) so if you still had power the PRIMARYS Neutral current would have to have been flowing through the earth BUT DEPENDING ON MOISTURE AND DEPTH OF GROUND RODS AND SOILS MINERAL CONTECT ETC ETC pretty high resistacne and Id think the voltage would be lowwwwwwwww
Your Neutral was fine and your low voltage secondary line and current flow was NOT via earth but Id still expect since the primary voltage was low your secondary would have been low????? It all depedns on where the break was and the moisture and ground rods and mineral contect and remember at 7200 volts theres not near as much current flow required as in your 120/240 volt use.
Was it dangerous?? I say yes but not so much in your own home as out there around the utility lines........
I dont know everything lol but this is my best opinion
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