What equipment is included in a transformer oil test set?

A transformer oil test set can refer to field or lab equipment. Common components include a BDV breakdown voltage tester with electrodes, a moisture measurement method such as Karl Fischer or capacitive sensor, tan delta or power factor instrument for dielectric loss, and sometimes resistivity or conductivity measurement. Many sets include sampling accessories, clean containers, thermometers, data logging, and calibration references. Some packages add portable DGA screening, interfacial tension tools, and particle counting depending on program needs.