CN205303149U - High overstrain metallic glass iron core distribution transformer of intelligent regulation capacity - Google Patents

Abstract

The utility model discloses an amorphous alloy iron core power distribution transformer with intelligent adjustment capacity and high overload. The core is made of amorphous alloy material. The upper end of the oil tank is a fully sealed structure with an air layer. The oil tank is filled with high-quality mineral oil with a flash point higher than 150 degrees. The windings include high-voltage windings and low-voltage windings. Connect with on-load capacity regulating tap changer. The utility model adjusts the capacity according to the load size to save energy; at the same time, when the large capacity is adjusted to a small capacity, due to the increase of the number of low-voltage turns, the magnetic flux density of the iron core is greatly reduced, so that the unit loss of the iron core becomes smaller, and the no-load loss and The no-load current is also reduced, reducing loss and saving energy; solving the problem of low voltage in the power grid, and meeting the needs of special power grid users such as short-term high overload and low load rate in normal times.

Description

Amorphous alloy iron core distribution transformer with intelligent adjustment capacity and high overload

technical field

The utility model relates to a power distribution transformer, in particular to an amorphous alloy iron core power distribution transformer capable of switching capacity according to the load size to save energy.

Background technique

The load of the power grid varies greatly in different regions. Large cities and industrial areas consume a lot of electricity and have a high load on the power grid. High-capacity distribution transformers are usually used. Electricity consumption in rural and remote areas has been at a low-load level for a long time, and the electricity consumption on holidays has increased sharply compared with usual times. If a small-capacity transformer is used, it will burn out due to overload. If a large-capacity transformer is selected, the transformer will be under-loaded for a long time. The loss will increase, resulting in a waste of energy, which is not conducive to energy conservation and environmental protection.

Contents of the invention

The purpose of this utility model is to overcome the deficiencies of the prior art and provide an amorphous alloy iron core distribution transformer with intelligent adjustment capacity and high overload. The needs of special power grid users such as high overload and low load rate at ordinary times.

The utility model includes a body, a transformer oil, an oil tank, a winding, and an iron core. The body is a three-frame and three-column type. The upper end of the oil tank is a fully sealed structure with an air layer. The oil tank is filled with transformer oil with a flash point higher than 150 degrees. The windings include high-voltage windings and low-voltage windings. Pressure tap changer connection.

Furthermore, the high-voltage winding is wound with a temperature-resistant 180-degree enamelled round copper wire, the low-voltage winding is wound with copper foil, and the layers are insulated with oil-resistant and high-temperature resistant H-grade insulating paper.

Further, the two ends of the winding are pressed by a pressure plate, and the upper clamp and the lower clamp are tightened by screws to increase the mechanical strength of the body.

Further, the high-voltage winding includes AX section, BY section, and CZ section, which are connected into a triangle (D) when the capacity is large, and connected into a star (Y) when the capacity is small; the low-voltage winding includes aa ₁ of a small number of turns. segment and a ₁ x ₁ segment and a ₂ x ₂ segment of the most coil part, when the capacity is large, segment a ₁ x ₁ and segment a ₂ x ₂ are connected in parallel and then connected in series with segment aa ₁ , when the capacity is small, segment aa ₁ , segment a ₁ x ₁ segment and a ₂ x ₂ segment all in series.

working principle:

The on-load capacity regulation tap-changer judges the current load current by monitoring the voltage and current on the low-voltage side of the transformer. Voltage tap-changer, in the state of excitation, the on-load capacity regulation tap-changer switches the size and capacity and voltage gear according to the capacity regulation command, and realizes the star and angle transformation of the high-voltage winding inside the transformer and the series connection of the low-voltage winding. , Parallel conversion.

It can be seen from the above technical solution that the utility model adjusts the capacity according to the load size to save energy; at the same time, when the large capacity is adjusted to a small capacity, due to the increase in the number of low-voltage turns, the magnetic flux density of the iron core is greatly reduced, so that the unit loss of the iron core becomes smaller. Small, the no-load loss and no-load current are reduced, reducing loss and saving energy; solving the problem of low voltage in the power grid, and meeting the needs of special power grid users such as short-term high overload and low load rate.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Fig. 2 is a schematic diagram of the connection of the high-voltage winding and the low-voltage winding when the utility model has a large capacity.

Fig. 3 is a schematic diagram of the connection of the high-voltage winding and the low-voltage winding when the utility model has a small capacity.

In the figure, 1. Body, 2. OLTC, 3. Air layer, 4. Transformer oil, 5. Winding, 6. Iron core, 7. Upper clamp, 8. Screw, 9 . Press plate, 10. Lower clamping piece.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the utility model includes a device body 1, a transformer oil 4, a winding 5, an iron core 6, an on-load capacity regulating tap changer 2 and the like.

Described device body 1 adopts three frames and three columns. The iron core 6 is made of an amorphous alloy material, which has a lower unit loss than silicon steel sheets. The upper end of the oil tank is a fully sealed structure with an air layer 3, and the oil tank is filled with high-quality mineral oil with a flash point higher than 150 degrees as transformer oil 4, which is a transformer insulating liquid.

The winding 5 includes a high-voltage winding and a low-voltage winding, both of which are connected to the on-load capacity and voltage regulating tap changer 2 . The high-voltage winding is wound with a temperature-resistant 180-degree enamelled round copper wire, the low-voltage winding is wound with copper foil, and the layers are insulated with oil-resistant and high-temperature resistant H-grade insulating paper.

The two ends of the winding 5 are pressed with a pressure plate 9, and the upper clamp 7 and the lower clamp 10 are tightened with a screw 8 to increase the mechanical strength of the body 1.

As shown in Figure 2 and 3, the three-phase high-voltage winding includes AX section, BY section, and CZ section, that is, the beginning is A, B, and C terminals, and the tail is X, Y, and Z terminals. When the capacity is large, it is connected into a triangle ( D) That is, the AX section, the BY section, and the CZ section are connected in sequence. When the capacity is small, they are connected in a star shape (Y), that is, the A, B, and C terminals are drawn out, and the X, Y, and Z terminals are connected together. The low-voltage winding of each phase is composed of three parts: the aa ₁ segment of the few turns part and the a ₁ x ₁ segment and a ₂ x ₂ segment of the majority of the coil part, and the a ₁ x ₁ segment and a ₂ x ₂ segment of the large capacity Parallel connection and then in series with aa ₁ section, when the capacity is small, aa ₁ section, a ₁ x ₁ section and a ₂ x ₂ section are all connected in series. When the capacity is changed from large capacity to small capacity, the number of turns of the low-voltage winding increases, and at the same time, the high-voltage winding becomes Y-connected and the phase voltage decreases, and the increase in the number of turns is equivalent to the multiple of the voltage decrease, which can ensure that the output voltage remains unchanged.

Both the high-voltage winding and the low-voltage winding are connected to the on-load capacity-adjusting tap-changer. Therefore, the change of the connection mode of the high-voltage winding, the parallel and series conversion of the low-voltage winding, and the adjustment of each tap part are all completed by the on-load capacity-adjusting and voltage-regulating tap-changer 2 .

The on-load capacity-regulating and pressure-regulating switch part of the utility model: the selection of the on-load capacity-regulating and pressure-regulating switch is SYTXYL-630(200)/10-5, with automatic oil filtering function, which can reduce maintenance costs; in order to achieve the best operation For economy, the switching capacity is set at 100kVA, and the switching current is 60% of the rated current. The switch and the device body are connected by flexible cables, and are clamped and fixed with wooden parts to enhance the stability and safety of the device body.

Claims (4)

1. the amorphous alloy iron core distribution transformer of an Intelligent adjustment capacity high overload, including device body, transformer oil, fuel tank, winding, ferrum core, described device is as three-frame and three pole, characterized by further comprising loaded capacity regulating voltage regulating shunting switch (2), iron core (6) is amorphous alloy material, fuel tank upper end is the all-sealed structure with air layer (3), the flash-point transformer oil (4) higher than 150 degree it is filled with in fuel tank, described winding (5) includes high pressure winding, low pressure winding, high pressure winding, low pressure winding is all connected with loaded capacity regulating voltage regulating shunting switch (2).

2. the amorphous alloy iron core distribution transformer of Intelligent adjustment capacity high overload as claimed in claim 1, it is characterized in that: described winding (5) two ends adopt pressing plate (9) to compress, screw rod (8) tension of upper clamping piece (7), lower clamping piece (10).

3. the amorphous alloy iron core distribution transformer of Intelligent adjustment capacity high overload as claimed in claim 1, it is characterised in that: described high pressure winding includes AX section, BY section, CZ section, is connected into triangle when Large Copacity, is connected into star during low capacity; Low pressure winding includes the aa of minority wire turn part₁The a of section and most wire turn part₁x₁Section and a₂x₂Section, a during Large Copacity₁x₁Section and a₂x₂Duan Binglian again with aa₁Section series connection, aa during low capacity₁Section, a₁x₁Section and a₂x₂Section is series connection all.

4. the amorphous alloy iron core distribution transformer of Intelligent adjustment capacity high overload as claimed in claim 1, it is characterized in that: high pressure winding adopts 180 degree of enamel insulated round copper wire coilings of heatproof, low pressure winding adopts Copper Foil coiling, and interlayer adopts the H class B insulation paper insulation of oil-resistant high-temperature.