Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Cooling and Insulation of Dry-Type TransformersA dry-type transformer is a special type of power transformer characterized by the fact that its core and windings are not immersed in insulating oil.This raises a question: oil-immersed transformers rely on insulating oil for both cooling and insulation, so how do dry-type transformers achieve cooling and insulation without oil?First, let’s discuss cooling .Dry-type transformerstypically use two cooling methods: Natural air cooling (AN): When opera

Dry-type transformers refer to power transformers in which the core and windings are not immersed in oil. Instead, the coils and core are cast together (typically with epoxy resin) and cooled by either natural air convection or forced-air cooling. As a relatively newer type of power distribution equipment, dry-type transformers have been widely used in power transmission and distribution systems in factory workshops, high-rise buildings, commercial centers, airports, ports, subways, and offshore

By Echo, 12 Years in the Electrical IndustryHi everyone, I'm Echo, and I've been working in the electrical industry for 12 years.From my early days doing commissioning and maintenance in distribution rooms, to later participating in electrical system design and equipment selection for large-scale projects, I’ve witnessed how dry-type transformers have evolved from traditional tools into smarter, greener devices.Recently, a new colleague asked me: “What’s the current

By James, 10 Years of Electrical Equipment Maintenance ExperienceHi everyone, I’m James, and I’ve been working in electrical equipment fault repair for 10 years.Over the past decade, I’ve worked in factories, substations, and distribution rooms of all sizes, involved in the installation, commissioning, maintenance, and troubleshooting of dry-type transformers. Dry-type transformers are among the most common electrical devices we deal with on a daily basis.Today, a n

Hi everyone, I’m Felix, and I’ve been working in electrical equipment fault repair for 15 years.Over these years, I’ve traveled across factories, substations, and distribution rooms all over the country, troubleshooting and repairing all kinds of electrical equipment. Dry-type transformers are among the most common devices we deal with.Today, a friend asked me: “What does it mean when the low-voltage side of a dry-type transformer has low insulation resist

1 Pre - commissioning InspectionAs a front - line tester, before formally commissioning a dry - type transformer, I need to carry out a comprehensive and systematic inspection. First, I conduct a visual inspection of the transformer body and its accessories, carefully checking for mechanical damage or deformation. Then, I check whether the leads of the high - and low - voltage windings are firmly connected and whether the bolt tightening torque meets the standard requirements (usually 40 - 60N&a

1 Pre - installation PreparationAs a front - line installer, I know very well that the preparation work before installing a dry - type transformer must be thorough. First, I will carefully review the design drawings and technical documents, and check one by one the technical parameters such as the model specification, rated capacity, and voltage level of the transformer to ensure they are in full compliance with the design requirements. Then, I will conduct an unpacking inspection of the transfo

1 Fault PhenomenonI am engaged in front - line fault maintenance work, and recently encountered problems with dry - type transformers. Dry - type transformers have a simple structure, are convenient for transportation, and easy for maintenance. They are widely used in power distribution places with relatively high environmental protection requirements. Because of their good fire - resistance, they can be installed in load - center areas to reduce voltage loss and power loss.The property manageme

What is Dry Type Transformer ?Dry Transformer DefinitionA dry transformer is defined as a transformer that utilizes air or gas instead of liquid for insulation and cooling.Transformer Types Cast Resin Dry Type (CRT) transformer Vacuum Pressure Impregnated (VPI) transformerAdvantages Dry transformers enhance safety by eliminating flammable or toxic liquids, reducing the risk of leaks or fires. They are maintenance-free and pollution-free because they do not require any oil changes, oil tests, oil