Can anyone give me references for seismic performance based design for pole-mounted electrical substation?

Thank you for posting your query.

You may refer- ASCE 7: Minimum design loads for buildings and other structures; Seismic Evaluation and Retrofit of Existing Buildings (ASCE/SEI 41-17);
FEMA 202, Earthquake Resistant Construction of Electric Transmission and Telecommunication Facilities Serving the Federal Government’.