Standard current in power lines?

The power company establishes a voltage on the lines. The current is determined by loads in all the homes.

In the US, the voltage from the substation is probably about 13000 volts. A transformer near a group of homes steps this down to about 230v with line to line with a neutral that allows 115 v from either line to neutral.

The current isn't standard. The current goes up depending on the load required. Generally the lines are rated about 13kva, which means the voltage is around 13,000 V per line. The gauge size of the line is what determines the amount of current that can run thru the line.

I think, though I'm not sure, each line can carry at least 100 amps. With three lines available (3 phase), then this makes at least 3,900,000 watts available per 3-line running from substation

There is no "standard current", perhaps that's why you can't find any info.

The power feed into each house depends on the size of the house and the amount of power it needs. Typical values are 50, 75, 100, 150, 200 amps.

Or perhaps you mean the voltage, which is 240 volt split phase.

The substation generates a lot more voltage and current, typically 6kV or 13kV, and that is dropped to the voltage and current mentioned above, via transformers in the street or on poles near each house or group of houses.

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hard stuff research at google this could help