Phase voltage vs line voltage in a delta configuration
For a delta source or load, the phase voltage is the same as the line voltage. For a wye source or load, the phase voltage is the line-to-neutral voltage. For a delta source or load, the phase current is the current in the line-to-line branch. For a wye source or load, the phase current is the same as the line current. Each source and load has its own phase current definition even if there is only one source and one load as shown. As illustrated by your diagram, a wye load can be connected to a delta source and create its own neutral.