MUMBAI, India, Aug. 12 -- Intellectual Property India has published a patent application (202621074281 A) filed by Amarjit Prakashrao Kene; Mohan Purushottam Thakre; Rajni Patel; Ranjana Navnath Khandebharad; Prasad Kubal; Pradip Lataye; Shreya Pawar; and Swanand Kamtekar on June 15, 2026, for Testing Kit Of Buchholz Relay.
Inventors include Amarjit Prakashrao Kene; Mohan Purushottam Thakre; Rajni Patel; Ranjana Navnath Khandebharad; Prasad Kubal; Pradip Lataye; Shreya Pawar; and Swanand Kamtekar.
The application for the patent was published on August 07, 2026, under issue no. 32/2026.
Abstract: The early detection and localization of incipient faults in power transformers is the key to ensure its operational reliability. The Buchholz relay is one of the wide ranges of protection devices used with oil-immersed transformers and is unique in its ability to detect both slow gas formation due to dielectric breakdown and rapid oil surge caused by catastrophic internal arcing. Despite extensive use, it is essential to excite the Buchholz relay at high voltage or to physically open the transformer unit to perform a conventional test, which creates heavy logistical restrictions in routine maintenance verification and in pedagogical access for training in transformer techniques. A laboratory scale Buchholz relay testing kit was designed, developed and experimentally validated, with the aim of simulating the electromechanical response properties of the Buchholz relay under controlled low voltage conditions. A simplified fault simulation architecture is used to simulate two different types of faults: (i) a gradual build-up of gas to verify the alarm functionality, and (ii) an oil surge transient to validate the trip functionality. Experimental results show repeatable and consistent responses to relays for various simulated fault scenarios. When the amount of gas in the chamber reaches the upper float mechanism's set threshold, the alarm contact is activated. Then under oil surge conditions caused by a manual trigger the trip contact is activated after 400 milliseconds (0.4 seconds). All test equipment is powered by 12V DC, eliminating any high voltage risks and maintaining the integrity of the test equipment. In addition to its research applications, the kit developed is used as a pedagogically effective demonstrator, connecting theoretical aspects of transformer protections with practical, hands-on experience. It is economical in construction, safe in operation and easy to use, and is especially suitable for academic teaching laboratories and technician training.
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