Low Frequency Heating for Power Transformers Drying

In the finely tuned machinery of the energetic field, every inefficiency can lead to significant financial implications. Transformers, a cornerstone in energy-driven industries, are not exempt. Moisture, seemingly innocuous, can be a costly intruder, disrupting operations and denting profit margins.?

Lab samples, also proving it, indicated that a moisture content of 3-4% can accelerate the degradation rate of paper up to tenfold or more compared to dry paper.

The conventional drying of the transformer's active parts, thankfully, both achievable and applicable for the majority of power transformers utilized in the energy sector. Yet, like every traditional method, it's not without its shortcomings.

When Traditional Drying Falls Short

In certain circumstances, traditional drying methods might not fit the bill. Here’s why:

• Time is Money: In today's fast-paced world, time is an invaluable asset. Traditional techniques like hot oil circulation or vacuum drying, while effective, are notoriously slow. Given the relentless demand for energy, taking a transformer offline for extended periods for drying can lead to operational challenges and economic repercussions.
• The Resource Conundrum: Conventional drying methods can sometimes be a drain on resources. Imagine needing an additional tank, perhaps of 3.5kL capacity, just for oil storage during the vacuuming process. In areas where resources are scarce, this isn’t just inconvenient; it’s a genuine roadblock.
• Logistical Nightmares: Ever tried moving a bulky piece of equipment in a constrained space? Now, imagine doing that with gallons of transformer oil. Depending on the transformer's location, transportation and accessibility can be a logistical headache.?

Playing with Fire (Almost Literally!): Traditional methods come with their own set of risks. Subjecting an older transformer tank to a complete vacuum might compromise its structure, and can pose threats to the moist paper insulation if subjected to load over extended periods.

Embracing Modernity: low frequency heating of power transformers

• The low frequency heating of power transformers is rooted in an elementary yet profound principle: using low-frequency electric currents to dry and heat transformer windings. When these currents pass through the windings, they generate internal heat. Given that the heat source is the winding itself, the process allows for a deeper, more thorough penetration, aiming for an optimal drying temperature range between +75 to +120°C. This internal heat facilitates a rapid and holistic evaporation of moisture, making it a better approach when compared to traditional drying methods.As with any technique, the efficacy largely depends on the equipment and its execution, such as the LFD GlobeCore’s device (Low-frequency dryer):
• Synergistic Functioning: The LFD isn’t just a standalone device. For better results, it can be used in conjunction with other drying systems. When paired with devices like CMM thermal vacuum dryers, the drying efficiency of oil-filled transformers is significantly elevated, offering a dual-action solution. It can also effortlessly collaborate with other units such as BV, UVV, or Mojave Heat, ensuring that moisture is effectively trapped and removed.

• Automation at Its Best: Human errors can be costly. The LFD device, with its automated functioning, ensures that once the drying process initiates and reaches the desired temperature, it operates autonomously. It maintains this state until the moisture level drops below 10 g/t (ppm) mark, guaranteeing optimal drying conditions.
• Compact and Energy Efficient: LFD device ensures minimal space occupancy while delivering maximum output. Additionally, its design emphasizes low power consumption, making it a cost-effective and environmentally friendly solution.
• Technically Advanced: At its heart, the LFD device by GlobeCore houses a range of intelligent components. These continuously monitor and adjust drying parameters in real-time, ensuring that the conditions within the transformer windings are always optimal for moisture removal.

In the constantly evolving world of power transformers, it’s crucial to be in the know and ready to adapt. Traditional methods have served us well, but as challenges change, so should our solutions. Embrace the future, and keep that transformer dry!

Anna Kolotiy - LinkedIn

Sales manager

[email protected]