Regular service and inspections will keep your dry-type transformer running. Use this dry-type transformer maintenance checklist to save time on unnecessary repairs while improving the performance of your equipment. With regular maintenance, you will know when your transformer needs repairs or replacement before it fails. If either of these scenarios occurs, contact Vajra Transpower for service or a new medium voltage dry type transformer.
Dry-Type Transformer- Definition
Dry-type transformers are electrical transformers that use air as the dielectric medium between their windings and core.
The windings and core of a dry transformer are sealed in an air-filled tank rather than immersed in liquid. Dry transformers, unlike oil-filled transformers, are not susceptible to damage from short circuits, vibrations, or temperature changes. They also do not necessitate extensive maintenance.
Dry transformers are used in situations where there is no danger of electrical short circuits or hazardous voltages. Dry transformers are commonly used in residential installations where the transformer is located indoors but the wiring it serves is outside or exposed to the elements. If you live in an area prone to lightning strikes or flooding, a dry transformer may be preferable to an oil-filled version. Vajra Transpower is one of the best transformer manufacturers in Hyderabad offering reliable transformers.
Maintenance Checklist
Checking for Dust Accumulation
Look for rust on the clamps and core steel, carbonization or tracking on the windings and insulation, discoloration on surfaces that could indicate overheating, and loose connections when cleaning a transformer. Tighten any hardware components that appear to be loose, if possible. If you don’t feel confident enough, you can seek professional assistance.
While the Transformer is Energized
To ensure safety, do not perform any maintenance on the transformer while power is being supplied to it. Remove anything in the area that could obstruct airflow.
Before attempting to clean off accumulated dust and dirt, de-energize the unit. To avoid more frequent maintenance, keep the transformer in a dry, clean space; keeping it in the proper place will warrant an annual maintenance check. You should also listen for any unusual sounds from the transformer; these could indicate a mechanical problem with the transformer.
While the Transformer is Deenergized
Clean off any dust or debris that has accumulated in the cooling fans and windings using a vacuum or a can of compressed air. A combination of the two, using the vacuum first and then the compressed air, will suffice. Secure all hardware and replace any worn or broken parts. A filter will be required to remove dust from fan blades or transformer windings. These filters protect the inner component and can help it last longer.
Regular checkups for better maintenance
In addition to the inspection, you must perform several tests on the transformer during routine maintenance. These tests validate the unit’s operation and can detect issues that do not produce visible defects
- Transformer turns ratio test
A Transformer Turns Ratio (TTR) Test is not required unless you suspect the system has electrical problems. For example, if you notice signs of discoloration during your inspection, electrical issues may be at fault, necessitating a TTR. Do not perform a TTR test on your own for the sake of accuracy and the safety of your personnel. Instead, contact a professional who has access to cutting-edge testing equipment. An expert will have the necessary tools and protective equipment to conduct this test correctly and safely.
- Dielectric Absorption Test
For a dielectric absorption test, measure for 10 minutes from winding to winding and from winding to ground. The polarization index ratio is calculated by dividing the measurements by 10 minutes and 1 minute. The PI should be greater than 2.0 to be considered acceptable.
Tips for preventive maintenance
- Before continuing with the cleaning and repairs, turn off the transformer.
- Check for dirt and dust in the system.
- Using compressed air, vacuum or blow out the dust or dirt.
- Examine the insulation and parts for discoloration, which could indicate an electrical problem or overheating.
- Tighten any available hardware.
- Re-energize the system to run the required load tests.
Dry-type transformers are essential components in many industries that make our lives easier. However, with such a large capacity for a piece of machinery comes to some simple and basic steps to ensure they are well maintained and far from causing accidents.
Dry-type transformers, in particular, are a safer and more reliable type of transformer, which is why it is best to seek professional assistance with their maintenance to ensure that the machine is getting the job done.
To get the most out of your dry-type transformer, start early and invest in the right one, such as those available at Vajra Transpower. Our Dry-type Transformers are excellent choices if you want to maximize your investment.
We can assist you in your search for the best dry-type transformer manufacturer in Hyderabad. Vajra Transpower Pvt. Ltd. is a leading electrical transformer supplier in Hyderabad, and we produce a wide range of transformers.
To control quality and provide long-lasting transformers, we use advanced technology in all aspects of manufacturing and inspection. Our transformer is extremely safe, dependable, and reasonably priced. Contact us if you want to buy the best transformer at a reasonable price.