Why do transformers need electric insulation?

Pu F class insulation varnish

In power transformers, insulation systems are fluid (either liquid or gas) and solid components. Since 1886 and the mid-1970s, when the flammability of mineral oil was an issue, petroleum-based lubricants have been used to insulate power transformers. Still, it has since been phased out of transformer production due to environmental concerns. Any of several high-flash-point fluids can now be used in its place (silicones, high-flash-point hydrocarbons, chlorinated benzenes, or chlorofluorocarbons). Nitrogen, air, and fluorogases are examples of gas systems. To avoid combustibility and limit secondary effects of internal failure, New Manthan Industries start the utilization of fluorogases. Low boiling-point liquids, such as Freon, have been used to construct transformers, allowing enhanced heat transmission via a two-phase cooling system.

Insulation in the core and coil assembly is separated into two categories: primary insulation and minor insulation. The high- and low-voltage windings and the windings and body are separated by significant insulation. Depending on the structure, little insulation may be utilised between the sections of individual coils or windings. Finally, each strand of conductor and/or groups of strands comprising a single turn are insulated.

Insulation materials that we can employ include:

Conductor insulation is frequently colour-coded. Grounding conductors for insulated equipment

Green with yellow stripes or plain green is the most common colour. Grounding is protected by insulation.

The colour of conductors is usually white or grey. Ungrounded conductors, also known as “hot wires,” are frequently black.

Insulators for electrical systems:

Conductors are the polar opposite of electric insulating materials. Electrical insulators have a small number of free electrons, which make them oppose current passage. This indicates that electricity has a difficult time travelling through this material.

The purpose of the insulating substance is to isolate the electrical conductor and ensure that electricity only flows where it is supposed to go, rather than elsewhere.

The electric line is an excellent example of how to grasp this concept. The inside of the cord is commonly made of copper or another metal – which, as we saw earlier, produces excellent electrical conductors – and is covered with an insulating layer to ensure that electricity only flows within the cable and does not cause an electrical accident or leakage.

Electrical insulation is utilised in power systems in addition to wires and cables. Polymeric varnish, for example, protects wire coils in tiny transformers, electric motors, and power generators.

Read More: Best Insulation Compound for Fiber Glass Coating by New Manthan Industries

What is the significance of electrical insulation?

Electrical insulation is not only required but also necessary. The primary goal of electrical insulation is to keep people safe and prevent electric shock.

The involuntary movement caused by electric shock might result in fatal damage. It can potentially result in mortality due to ventricular fibrillation (issues with heart-pumping) or muscle contraction.

Insulation protects the materials through which electric current flows as well as prevents electric shock. The current flow between separate electrical conductors is limited by electrical insulation.

Importantly, no electrical insulation material is ideal. Each material has some electrical resistance. However, this resistance is not limitless. As a result, it is best to select the appropriate material for each occasion.

Coatman Thermocoat 155 CY Stable is one of the most popular Phenol Masked Polyisocyanates products. Isocyanate reaction values in the product are around 14.2%. It is a solvent-free resin, which reduces pipe weight and boosts water flow through the pipe while also halving energy usage. It also inhibits and prevents fungal development and other comparable processes. It’s compatible with a variety of OH-Terminated Resins, Polyester Polyol Resins, and other resins. It’s also used by Wire Enamel coating chemical manufacturers for improved mechanical, dielectric, and electrical properties.

CY Stable has a melting (softening) point of around 100°C. Ethyl Acetate, Di Acetone, Alcohol, Glycol Ethers, Ketones, Phenol, and Cresol are all soluble. In Aliphatic Hydrocarbons, it is insoluble, while in Butyl Acetate, it is 50% soluble. If properly packed, the product can last for up to a year. Coatman Thermocoat 155 CY Stable is one of the best enamel products available. Because it is an exclusive phenol masked polyisocyanate, it is a better and excellent substitute for Bayer Desmodur CT Stable. In paper drums, the product is available in 50 and 100 kg.
Another good product is Coatman Thermocoat Coatman 155 AP stable, another Phenol Masked Polyisocyanates product ideal for wire enamelled coating. The isocyanates detected were at a level of 12%. The hue of AP stable is light yellow, and it is a solvent-free substance. The substance can be formulated for Photo emulsion by mixing it with various Polyol And Other Resins (Oh-Terminated). Textiles, screens (Nickel Graver), and motor varnishes can all benefit from it. It’s also a solvent-free resin with good wire enamel varnish qualities (Combination, Electrical, and Di-electrical Binder). It’s Ap stable qualities make it an excellent replacement for Bayer Demodur Ap Stabil. AP Stable has a melting point similar to CY Stable, around 100°C. It is soluble in solvents such as Ethyl Acetate, Di Acetone Alcohol, Butyl Acetate, Otherester, and Phenol.