Characteristics Of Epoxy Resin Dry-type Transformers And Applications - Epoxy Resin, Dry Type

1 Introduction With social progress and development

, make people's power distribution Transformer Safety, environmental protection, reliability requirements are high, and human security has become the most important factor to consider.

2 oil-immersed transformer oil-immersed transformers advantages:

1, transformer oil, good insulation, good thermal conductivity, while transformer oil cheap; 2, large-capacity transformer to solve the heat dissipation and high-voltage insulation problems. Oil-immersed transformers Disadvantages: 1, transformer oil with flammability, when the encounter may be burning flame, explosion; 2, transformer oil are harmful; three, transformer oil would be regularly checked; 4, anti-short-circuit capacity of oil-immersed transformers poor; 5, poor sealing performance of oil-immersed transformers and appropriate aging, leakage of oil in place a serious run, affect the safe operation of equipment, while affecting the environment; 6, oil-immersed transformer insulation level is low, according to A-class insulation design, manufacture. Oil-immersed Transformer Fault: 1, due to wet insulation, insulation and transformer oil degradation and other aging will result in reduced transformer insulation; 2, due to surface moisture combined with dust, salt and other stains caused transformer bushing flashover caused by casing the same time, As the stolen goods after absorbing increased conductivity increased to leak, causing surface discharge results in breakdown; 3, as oil standard tube, breathing tube or pipe explosion vent blockage leading to the phenomenon of transformer oil level there is false; 4, when the transformer secondary internal short circuit or transformer transformer injection spark will cause an accident; 5, due to leakage of oil exists in operation, claims details, leading the operation to take the necessary measures to fill the oil.

3 Epoxy resin Dry-type transformers Epoxy resin is a flame, flame retardant, self-extinguishing insulating material of solid, safe, clean. At the same time is more than 40 years has proven reliable solid insulation and thermal insulation technology.

3.1 structural characteristics of epoxy resin dry-type transformers

1, high and low voltage winding used in all Copper With (Foil) wound; 2, high and low pressure winding all the epoxy resin in a vacuum casting and curing to form high-strength Glass Steel structure; 3, high, low voltage winding according to the requirements in a vertical pass cooling trend Road; 4, coil, the outer surface of glass Fiber Mesh enhancement; 5, insulation levels are F, H grade; 6, epoxy resin dry type transformer small and light weight. Epoxy resin dry-type transformers can be installed temperature display controller, the operation of the transformer winding temperature display and control, to ensure normal service life of transformers. The temperature Sensor PT100 platinum resistance temperature into low-voltage winding to obtain the signal, after processing by the control circuit board Cycle Shows the temperature of each phase winding. It has a temperature set function, manual / automatic start and stop Fans , Break down, over-temperature alarm sound and light signals and automatic over-temperature trip and other functions, with the national regulations resistance to electromagnetic interference. At the same time allow intelligent computer interface, remote control. Epoxy resin dry-type transformer is equipped with low noise fan flow rate, starts winding temperature can be reduced, increased load capacity, extend transformer life; the use of forced air cooling, the rated capacity can be increased 40-50%.

3.2 Technical characteristics of epoxy resin dry-type transformers

(1) electrical performance, low PD values: in the transformer insulation structure, how much insulation would be some local weakness, it will first be under the influence of electric discharge occurs, then the formation rather than penetrating the insulation breakdown It may occur in the insulator surface or internal, that is, partial discharge. However, the destruction or partial electrical insulation aging, most of them from the beginning of PD, its dangers highlighted in insulation life decreases rapidly, eventually affecting safe operation. Dry-type transformers because of its unique structure (high, low voltage winding all use copper (foil) wound), and its advanced manufacturing technology level (low and high winding all the vacuum casting epoxy resin and curing), to local discharge value is low. (2) resistance to lightning and strong impact: As the high and low voltage winding all use copper (foil) around into, layers of low voltage, large capacitance, initial voltage distribution in foil windings close to linear, so the impact of strong anti-lightning (3) short circuit capability: Since the high and low voltage winding reactance of the same height, no helix angle phenomenon, the coil ampere-turns balance between high and low voltage winding short circuit caused by the axial force is almost zero, so the ability of anti-short circuit . (Four) a good anti-cracking performance: dry-type transformers with epoxy resin, "Thin Insulation (1-3mm) technology" to meet the low-temperature, high temperature and large temperature range of occasions, to meet the long-running anti-cracking requirements to solve the "thick insulation (6mm) technology" to solve the cracking problem is difficult to get dry-type transformer is technically reliable guarantee. (5) overload capability: If the same load capacity of the transformer losses are equal, the size of copper conductor than copper the corresponding increases, volume increases, the filler resin, the corresponding increase in the amount, so a large winding thermal capacitance, transformers strong short-term overload. (6) The flame retardant performance is good: The epoxy resin vacuum casting process without pollution, is conducive to environmental protection, the transformer has a maintenance-free, moisture-proof, heat resistant, flame retardant and self-extinguishing properties, suitable for various environments and harsh conditions occasions. (7), low loss, low noise: typically mineral oxide insulation core of high quality cold-rolled silicon steel, through advanced processing technology, so that losses to a minimum level and no-load current, and obtain very low noise level. With Fashion With a good core, the surface seal coating F grade resin paint to dust, Antisepsis , Anti-smoke, and corrosion. (8) High-temperature rating: Epoxy resin dry-type transformers are F-class or the H-class insulation, long-term, in the 155 or 180 high temperature safe operation. In the same capacity, it's small size, light weight, saving installation costs. (9) relevant technical specifications: capacity 10000KVA; voltage 35KV; Insulation class F or H level.

4 end

Language has the capacity of distribution transformer is not, the characteristics of low voltage dry-type transformers of epoxy resin has good electrical and mechanical properties, high thermal resistance, and is a reliable security environment, energy-efficient new products, can adapt to a variety of environments. Through the use of epoxy resin dry-type transformers can reduce the dimension Care Workers For volume and enhanced security, and create added value; transformer oil will be reduced significantly reduce the oil used for cleaning and replacement of maintenance costs, and because reduction of fuel consumption, reduce environmental pollution due to leakage, the risk of oil ; also a good epoxy resin dry type transformer nameplate operating capacity and ultra-short circuit ability, will bring reliable electricity supply to ensure safety. As the epoxy resin dry type transformer mineral oil changes than the full

by: gaga

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