CN2919476Y - Novel coil structure of 10KV dry-type transformer - Google Patents

Abstract

A new coil structure of a 10 KV dry-type transformer pertains to the transformer technology field. Pour the high voltage and low voltage coil into a whole by epoxy resin, fill the space between the high voltage and low voltage coil with epoxy resin, the electrical insulation distance between the high and low-voltage coil is 12-15 mm. The middle of the high and low-voltage coil is provided with a heat sink respectively. The exterior of the high voltage coil and the internal of the low-voltage coil are respectively provided with 2-3 mm thick epoxy resin. The utility model is compact and reasonable and changes the air insulation between the high and low voltage coil into epoxy resin insulation with more superior electrical performance, thereby lowering manufacturing costs and saving social resources. The heat dissipation of the high and low voltage coil begins from the heat sink in the central of the high and low voltage coil. High and low voltage coil become a whole to enhance capacity of anti-electro dynamic of transformer, at the same time facilitate to assemble the transformer and improve the efficiency of assembly.

Description

10KV dry-type transformer new coil structure

Technical field

The utility model relates to the loop construction of the structure of transformer, particularly dry-type transformer, belongs to the transformer technology field.

Background technology

The kind of transformer is a lot, and oil-filled transformer, dry-type transformer etc. are arranged, and the poured with epoxy resin dry-type transformer has its unique advantage, and since the middle and later periods in last century rises, dry-type transformer is worldwide developed rapidly.The high-tension coil of existing poured with epoxy resin dry-type transformer, low-voltage coil carry out poured with epoxy resin respectively to be sealed, and the epoxy thickness that the surfaces externally and internally of high-low pressure winding (coil) is sealed is 2.5mm; Distance between low-voltage coil and the iron core is 15mm (thickness that contains epoxy resin); Distance between the high and low pressure coil is 45mm (thickness that contains epoxy resin); Do not have mechanically contact between the high and low pressure coil, the centre is an air, insulate with air.

Poured with epoxy resin dry-type transformer, high-tension coil adopt enamelled wire or Copper Foil to carry out coiling as electric conductor, and low-voltage coil adopts copper strips (paper tinsel) coiled; The high and low pressure coil separates coiling and cast, coil is casting epoxy resin and curing in a vacuum respectively, the inside and outside surface of coil is strengthened by fiberglass gridding cloth, constitute the high strength glass fiber reinforced plastic body structure, can withstand very big electric power when transformer runs into short circuit, the transformer that the short-circuit electromotive force reason causes damages the transformer that causes than electric power in the oil-filled transformer and decreases few in dry-type transformer.

The employed epoxy resin of poured with epoxy resin dry-type transformer is solid insulating material fire-retardant, self-extinguishment, and under the situation of breaking out of fire, as long as transformer one outage, fire will extinguish automatically.The employed content of epoxy resin of poured with epoxy resin dry-type transformer seldom, with a medium-sized 10kv transformer is example, epoxy resin has only about 100 kilograms, and a traditional oil-filled transformer has about 1000 kilograms, under the situation of breaking out of fire, transformer oil can be combustion-supporting, causes the rapid spread of fire along with the mobile meeting of transformer oil.Oil-filled transformer must have independently transformer room, and dry-type transformer does not need independently transformer room, therefore adopts the civil engineering costs of dry-type transformer power distribution room to reduce.

The poured with epoxy resin dry-type transformer does not need to safeguard through row basically, as long as cleaning dust, oil-filled transformer is because transformer oil exists aging, seepage wet goods situation, just test at set intervals, transformer oil is handled, and the main insulating material of dry-type transformer relies on air, and air is not arrheaing movingly, and its insulation property do not have significant change basically.

In order to guarantee the epoxy cast dry transformer heat dispersion, temperature display controller and cooling blower are installed on epoxy resin dry type transformer, the operating temperature of transformer coil is shown and controls, after the temperature of transformer coil arrives certain temperature, temperature controller starts cooling blower automatically, guarantees the safe operation of transformer.

Though comparing with traditional oil-filled transformer, existing dry-type transformer has remarkable advantages, but dry-type transformer coil mainly adopts air to insulate, the dielectric strength of air is 0.8kv/mm, the heat dissipation problem of dry-type transformer is mainly by strengthening the cross section of transformer coil insulation distance and transformer coil conductor, reduce the caloric value of transformer coil, and the increasing in coil insulation distance and coil-conductor cross section makes the manufacturing cost height of dry-type transformer.

The utility model content

The purpose of this utility model is to provide between a kind of high and low pressure coil insulation distance little, good insulation preformance, the 10KV dry-type transformer new coil structure of transformer low cost of manufacture.

The purpose of this utility model is to realize by the improvement to existing dry-type transformer coil structure, 10KV dry-type transformer new coil structure, comprise high-tension coil, low-voltage coil, it is characterized in that high-tension coil becomes an integral body with low-voltage coil with poured with epoxy resin, filling epoxy resin between high-voltage coil and low-voltage coil, electric insulation distance between high-tension coil and the low-voltage coil is 12-15mm, the middle part of high-tension coil and low-voltage coil is respectively equipped with the heat radiation air flue, and the outer wall of high-tension coil, the inwall of low-voltage coil have the thick epoxy resin greater than 2mm respectively.

The utility model is rationally compact, with the insulation between the high-voltage coil and low-voltage coil by air insulation, change the more superior epoxy resins insulation of electric property into, dwindle the insulation distance between the high-voltage coil and low-voltage coil, radiating surface cancellation between the high-voltage coil and low-voltage coil, heat radiation air flue by the high-voltage coil and low-voltage coil middle part replaces, and reduces manufacturing cost, saves social resources.The conductor of high-voltage coil and low-voltage coil does not contact with air fully, improves electrical insulation properties, can send immediately after the long-time stoppage in transit of transformer.High-voltage coil and low-voltage coil has become an integral body fully, improves the anti-electrodynamic ability of transformer more, can bring great convenience simultaneously when transformer assembles, and improves efficiency of assembling.

Description of drawings

Fig. 1 is the structural representation of existing poured with epoxy resin dry-type transformer coil;

Fig. 2 is the section structure schematic diagram of existing poured with epoxy resin dry-type transformer coil;

Fig. 3 is a structural representation of the present utility model;

Fig. 4 is a section structure schematic diagram of the present utility model;

Among the figure: 1 high-tension coil, 2 low-voltage coils, 3 iron cores, 4 epoxy resin, 5 heat radiation air flues.

Embodiment

High-tension coil 1 and low-voltage coil 2 usefulness epoxy resin 4 are poured into an integral body, be arranged on unshakable in one's determination 3 periphery.Fill full epoxy resin 4 between the high and low pressure coil, electric insulation distance (epoxy thickness) between high-tension coil and the low-voltage coil is 15mm, the middle part of high-tension coil 1 and low-voltage coil 2 is provided with the heat radiation air flue 5 of 3mm respectively, and the outer wall of high-tension coil, the inwall of low-voltage coil are provided with the thick epoxy resin of 2.5mm 4 respectively.Distance is 15mm between the inwall of low-voltage coil and unshakable in one's determination 3.

Claims (1)

1, a kind of 10KV dry-type transformer new coil structure, comprise high-tension coil, low-voltage coil, it is characterized in that high-tension coil becomes an integral body with low-voltage coil with poured with epoxy resin, filling epoxy resin between high-voltage coil and low-voltage coil, electric insulation distance between high-tension coil and the low-voltage coil is 12-15mm, the middle part of high-tension coil and low-voltage coil is respectively equipped with the heat radiation air flue, and the outer wall of high-tension coil, the inwall of low-voltage coil have the thick epoxy resin greater than 2mm respectively.

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