When it comes to transformers, the management of oil levels is a key measure to ensure seamless and efficient operational performance. In this regard, the Magnetic Oil Level Gauge (MOG) emerges as a pivotal player, playing a crucial role in monitoring, regulating, and maintaining optimal oil levels.
By providing real-time insights into a transformer’s oil volume, the MOG contributes to the overall reliability and longevity of the system. Its detailed design and precise functionality make it an indispensable component, safeguarding against potential operational disruptions and contributing to the sustained efficiency of electrical power systems.
Let’s delve into the construction, components, and working principle of a Magnetic Oil Level Gauge in electrical power systems.
Construction of the Magnetic Oil Gauge
At the heart of the MOG lies a sophisticated construction comprising three key elements: a float, a bevel gear arrangement, and an indicating dial. The dial, marked from empty to full with intermediary divisions, provides a visual representation of the oil level. Crucially, the prescribed oil level at specific temperatures may also be indicated. A mercury switch and bevel gear are strategically fixed to the pointer, ensuring precise alignment with the oil level’s changes.
Within the conservator tank, a ball or drum-type float is attached to a lengthy float arm. This arm houses a bevel gear unit on one side, magnetically coupled with the pointer and mercury switch arrangement on the other side. While the bevel gear system resides inside the conservator tank, the dial, pointer, and mercury switch are positioned outside, creating a symbiotic relationship crucial for accurate oil level readings.
Working Principle of the Magnetic Oil Gauge
Every electrical transformer is equipped with a conservator – an expansion vessel managing oil volume fluctuations caused by temperature changes. As the oil expands or contracts, the float attached to the float arm adjusts its position accordingly. This movement translates through the bevel gear, generating rotation.
Externally, the pointer, magnetically linked to the bevel gear, mimics the changes in the oil level. The pointer is equipped with a mercury switch, which also plays a pivotal role. As the oil approaches critical levels, the switch closes, triggering an audible alarm. This alarm serves as an alert for necessary oil top-ups, preventing potential operational disruptions.
In transformers with air cell conservators, the float arm is connected to an air cell. Changes in the air cell size, resulting from oil expansion or contraction, alter the alignment of the float arm, providing an alternative yet equally effective mechanism for monitoring oil levels.
The Magnetic Oil Level Gauge, although an overlooked component in transformer technologies, plays a very important role in maintaining optimal oil levels. Its complex construction and intuitive working principle make it an crucial part for the longevity and reliability of electrical transformers.
