The book "Recent Trends in the Condition Monitoring of Transformers" provides a comprehensive analysis of current developments in the field of transformer condition monitoring. It highlights the transition from traditional monitoring techniques to non-invasive methods that allow for more precise and efficient monitoring. The techniques discussed include the measurement of polarization/depolarization currents, recovery voltage measurement, as well as frequency domain spectroscopy and frequency response analysis. The focus is on the critical examination of the condition of transformer insulation, which is susceptible to failure under today's conditions of intensive use. The book offers valuable insights into the challenges of modern maintenance policies and demonstrates how targeted selection of appropriate techniques and cost-effective strategies can help in the early detection and prevention of potential failures.