The ornamental design for a distributiontransformermonitor, as shown and described.
FIG. 1 is top-front-side perspective view of a distribution transformer monitor showing our new design.
FIG. 2 is a bottom-rear-side perspective view thereof.
FIG. 3 is a top plan view thereof.
FIG. 4 is a bottom plan view thereof.
FIG. 5 is a left side elevational view thereof.
FIG. 6 is a right side elevational view thereof.
FIG. 7 is a front elevational view thereof; and,
FIG. 8 is a rear elevational view thereof.
Broken lines in FIGS. 1-8 are for illustrative purposes only and form no part of the claimed design. Stippling and tangency lines shown in the drawings are intended to represent the approximate three-dimensional contour of the design and are not intended to indicate surface decoration.