What kind of fire-resistant transformer

First, the flame-retardant power transformer : Generally refers to the epoxy resin dry-type transformers, its main performance is not easy to fire, or the ignition after the ignition is only limited within a certain range, and have a good self-extinguishing effect. This type of transformer is widely used in high-rise buildings and has good electrical and mechanical properties. At present, some domestic manufacturers have already mass-produced. In addition, the epoxy dry-type transformers can be generally classified into the following categories according to the manufacturing process: (1) epoxy-impregnated dry-type dry-type transformers, (2) epoxy resin-type dry-type transformers (3) hybrid rings Oxygen dry-type transformers (4) Epoxy cast surrounded by insulated dry-type transformers.

Second, the flame retardant liquid immersed power transformer: This transformer will immerse the transformer core and winding in the flame retardant liquid, the transformer winding is directly cooled by the flame retardant liquid, and the flame retardant liquid is cooled by the transformer shell air. This kind of flame-retardant liquid has better electrical properties, the material oxygen index is greater than 30%, the thermal stability is better, and the toxicity is lower. At present, the flame-retardant fluid mainly includes silicone oil, high molecular weight paraffin oil and synthetic grease, among which the silicone oil is most suitable for application. widely.

1. Silicone oil transformer: Silicone oil suitable for transformers is called methyl silicone oil, its thermal stability is good, auto-ignition temperature is up to 400 degrees, it is difficult to catch fire, and self-extinguishing performance is good, so it is a better fire-retardant cooling media material. In addition, silicone oil has good electrical properties, high dielectric constant and low dielectric loss, so it is widely used. However, due to the large viscosity and poor fluidity of silicone oil, it will directly affect the cooling effect. This is a problem that silicone oil-based transformers must focus on.

2. High-molecular-weight paraffin oil transformers: There are also many types of flame-retardant liquids, among which RTEMP has been used in power transformers. However, due to its high viscosity and its viscosity changes with temperature, its application range is affected.

3. Synthetic grease transformer: there are many types of synthetic grease, among which MIDEL7131 liquid, commonly known as M liquid, is suitable for transformers. Its chemical composition is quaternary tetraethanolate, which is a nontoxic transparent liquid, although its viscosity is relatively high. , But its specific heat and thermal conductivity is better, so its cooling effect is equivalent to transformer oil. Its high electrical insulation strength, small thermal expansion, and low freezing point, so the oil-immersed transformer products for standard flammable oils do not need to make major changes, you can produce liquid M-immersion transformers, but due to high prices, so use The range is limited.

Third, the non-combustible power transformer: This type of transformer cooling insulation media material is not burning, the current medium is liquid and gas type two.

1. Non-combustible liquid transformer: It is made of non-combustible liquid and is used for cooling and insulating medium of transformers. According to different materials, there are generally the following types: Asilcleller type, chlorinated oil type, tetrachloroethylene type, and tetrachloroethylene type.

2. Non-burning gas insulated transformers: There are sulfur hexafluoride type and evaporative cooling type gas insulated transformers.