Power transformers constitute critical components of electrical power systems and continuous monitoring of their operational state is paramount for ensuring reliable and uninterrupted delivery of electricity. This study investigates the Thermo-Electrochemical Seebeck Effect of Insulator Oil with Various Water Content Towards HV Oil Insulator Condition Monitoring. Current monitoring methods rely on complex and resource-intensive procedures hindering real-time monitoring and efficient maintenance. This study proposes another approach by utilizing the Seebeck effect which generates voltage from temperature differences. The hypothesis states that contaminants in the transformer oil produce unique Seebeck coefficients due to charge carrier separation allowing for preliminary oil condition detection. This study aims to address the challenges associated with conventional methods by demonstrating the feasibility of using the Seebeck effect for breakdown voltage detection, developing a new, simple, and less intrusive method for real-time monitoring of transformer oil condition, investigating the relationship between the Seebeck coefficient produce by oil that having various water content. By adopting this approach, the HV industry can enhance the reliability and safety of its operations, optimize maintenance procedures, and ultimately contribute to a more sustainable and efficient power grid.