CN107369537A - One kind forces the hydronic high-power high-frequency transformer refrigeration system of interior guiding oil - Google Patents

Abstract

The present invention proposes a high-power high-frequency transformer refrigeration system with forced internal guide oil circulation cooling, which is used to solve the problem of difficult cooling of the iron core and primary coil of high-power high-frequency transformer; including transformer case, composite coil, oil pump and refrigeration unit , the composite coil and the iron core are set in the transformer case, the composite coil includes a diversion copper tube and a copper wire, the copper wire is wound on the diversion copper tube, and the copper wire is connected to the terminal located outside the transformer case; the bottom of the transformer case It is connected with the oil guide pipe, the oil guide pipe is connected with the oil pump, the oil pump is connected with the refrigeration unit through the oil guide pipe, and the refrigeration unit is connected with the diversion copper pipe through the oil guide pipe. The invention adopts the guide tube in the coil to flow in the coil through the cooling oil, increases the refrigeration unit, realizes the cooling effect of the large transformer, and has the functions of eliminating local high temperature in the transformer, reducing the volume, good cooling effect, prolonging the service life and saving energy.

Description

A high-power high-frequency transformer refrigeration system with forced internal guide oil circulation cooling

technical field

The invention relates to the technical field of transformer refrigeration, in particular to a high-power high-frequency transformer refrigeration system for forced internal guide oil circulation cooling.

Background technique

When the transformer is running, the heat generated by the loss of the winding and core must be dissipated in time to avoid insulation damage caused by overheating. Since the loss of the transformer is proportional to its volume, as the capacity of the transformer increases, its volume and loss will increase in the form of the cube of the core size, while the external area will only increase in the quadratic power of the size. For small-capacity transformers, the ratio of the outer surface area to the volume of the transformer is relatively large, and a self-cooling method can be used to dissipate heat through radiation and natural convection. The large-capacity transformer core and winding should be immersed in oil, usually: oil-immersed self-cooling, oil-immersed air-cooled, forced oil circulation cooling methods.

The oil-immersed self-cooling type uses the natural convection of the oil to bring heat to the wall of the oil tank and the heat dissipation pipe, and then relies on the convection conduction of the air to dissipate the heat. It has no special cooling equipment. The oil-immersed air-cooled type is based on the oil-immersed self-cooled type, and a fan is installed on the wall of the oil tank or the heat dissipation pipe, and a blower is used to help cooling. After adding air-cooled, the capacity of the transformer can be increased by 30% to 35%. The forced oil circulation cooling method is divided into two types: strong oil air cooling and strong oil water cooling. It uses the oil pump to drive the oil in the transformer into the oil cooler and then returns to the oil tank; the oil cooler is made into a special shape that is easy to dissipate heat. Use fan blowing or circulating water as the cooling medium to take away the heat. If the oil circulation speed is increased by 3 times compared with natural convection in this way, the capacity of the transformer can be increased by 30%. The forced oil circulation-guided cooling method basically belongs to the forced oil circulation type. The main difference is that the oil circuit of the transformer body is different. The transformer that adopts the oil circuit-guided cooling adopts certain measures in structure (such as adding oil retaining cardboard, paper tube) to make the oil flow according to a certain path; using guided cooling, the cold oil at the pump port is sent under a certain pressure into the oil passages between the coils, the wire cakes and the oil passages of the iron core, which can cool each part of the coil section, which improves cooling performance.

In comparison: although the forced oil circulation oriented cooling method solves the oil circuit disorder in the oil tank of ordinary oil-cooled transformers, it generally improves the situation that the heat generated by the coil in the transformer accounts for a larger proportion than the heat generated by the iron core. It is the preferred solution in large transformer cooling applications.

However, all the cooling methods currently on the market have insufficient oil circuit circulation, the flow rate of the cooling oil in the coil section between the coil and the iron core, and the coil is not high, and some places have not been effectively cooled, and certain sections and wires of the coil Turn local temperature is high. For high-power, high-frequency, and high-voltage transformers, as the requirements for power increase and volume requirements become smaller and smaller, the contradiction between the capacity of cooling oil in the transformer box and its cooling effect becomes more obvious. The need for better cooling measures is even more urgent.

Contents of the invention

Aiming at the technical problem that high-power transformers need more cooling oil and the cooling effect is not obvious, the present invention proposes a high-power high-frequency transformer refrigeration system with forced internal guide oil circulation cooling, using the primary coil as the oil conduit, and utilizing the oil pump pressure to greatly The circulation speed of the cooling oil inside the transformer is enhanced, so that the temperature of each part of the coil and the iron core is uniform and stable, and the local temperature will not be too high due to poor cooling oil conduction, thus playing a good cooling effect.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a high-power high-frequency transformer refrigeration system with forced internal guide oil circulation cooling, including a transformer case, a composite coil, an oil pump and a refrigeration unit, and the composite coil is wound on the iron core of the transformer Above, the composite coil and the iron core are arranged in the transformer case, the composite coil includes a diversion copper tube and a copper wire, the copper wire is wound on the diversion copper tube, and the copper wire is connected to the terminal located outside the transformer case; the transformer The bottom of the cabinet is connected with the oil guide pipe, the oil guide pipe is connected with the oil pump, the oil pump is connected with the refrigeration unit through the oil guide pipe, and the refrigeration unit is connected with the flow guide copper pipe through the oil guide pipe.

The copper wire is a multi-strand copper wire, and the copper wire is provided with an insulating layer; the oil guide pipe is a copper pipe, and the oil guide pipe is provided with an insulating layer.

The refrigerating unit is composed of a compressor refrigerating system, and is fixed outside the transformer case.

The refrigerating unit is a heat dissipation device fixed outside the transformer case.

Its refrigeration method is:

Step 1: The composite coil is wound on the iron core as a primary winding, and the composite coil is connected to the output end of the transformer through copper wires and terminals, and the iron core and the composite coil are immersed in the oil in the transformer case;

Step 2: The oil pump pumps the oil in the transformer case into the refrigeration unit through the oil guide pipe for cooling;

Step 3: The composite coil is composed of oil-conducting copper tube and multi-strand enameled wire. The cooled oil enters the diversion copper tube of the composite coil, and the cooling oil in the diversion copper tube cools the iron core and copper wire, and then cools down The oil flows from the bottom of the diversion copper pipe to the bottom of the transformer case.

The invention adopts the forced internal guide oil circulation cooling method for cooling, adopts the guide tube in the coil to flow through the cooling oil in the coil, and adds a refrigeration unit to achieve a good cooling effect for large-scale transformers, which fills the technical gap of the current large-scale transformer cooling device and has the advantages of Eliminate local high temperature inside the transformer, reduce volume, have good cooling effect, prolong life, save energy and other remarkable effects.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic structural diagram of the composite coil.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1 and Figure 2, a high-power high-frequency transformer refrigeration system with forced internal guide oil circulation cooling includes a transformer case 5, a composite coil 1, an oil pump 2 and a refrigeration unit 3, and the composite coil 1 is wound on the iron core of the transformer. On the core 4, it is used as the primary winding of the iron core 4 of the transformer. The compound coil 1 and the iron core 4 are arranged in the transformer case 5, and the oil in the transformer case 5 immerses the compound coil 1 and the iron core 4 therein. The lower end of the transformer case 5 is provided with rollers to facilitate the movement of the transformer case 5 in the transformer. The composite coil 1 includes a diversion copper tube 11 and a copper wire 12, and the copper wire 12 is wound on the diversion copper tube 11 without affecting the operation of the transformer. The copper wire 12 is connected with the connection terminal 7 located outside the transformer case 5, and the connection terminal 7 is a low-voltage bushing to realize the connection with the input end. The bottom of the transformer case 5 is connected with the oil guide pipe 6, the oil guide pipe 6 is connected with the oil pump 2, the oil pump 2 is connected with the refrigeration unit 3 through the oil guide pipe 6, and the refrigeration unit 3 is connected with the flow guide copper pipe 11 through the oil guide pipe 6. The oil pump 2 increases the flow rate of the cooling oil in the guide copper tube 11 of the composite coil, so as to realize rapid exchange of heat. The composite coil 1 can be used as a primary coil and conduct oil circuit conduction to cool the iron core and the coil.

Preferably, the copper wire 12 is a multi-strand copper wire, and an insulating layer is provided on the copper wire; the oil guide pipe 6 is a copper pipe, and an insulating layer is provided on the outside of the oil guide pipe 6, which can also conduct electricity.

Preferably, the refrigerating unit 3 is composed of a compressor refrigerating system, which is fixed on the outside of the transformer case 5, and the compressor is used to cool the oil in the oil guide pipe.

Preferably, the refrigerating unit 3 is a heat dissipation device fixed outside the transformer case 5 . That is, the refrigerating unit 3 dissipates the heat of the oil in the transformer case 5 to realize the elimination or exchange of the working heat of the transformer to the outside of the transformer.

Its refrigeration method is:

Step 1: The composite coil is composed of an oil-conducting copper tube and multiple copper wires or enameled wires. The composite coil 1 is wound on the iron core 4 as a primary winding. The composite coil 1 is connected to the output end of the transformer through the copper wire 12 and the terminal 7. connected, the iron core 4 and the compound coil 1 are immersed in the oil in the transformer case 5;

Step 2: the oil pump 2 pumps the oil in the transformer case 5 into the refrigeration unit 3 through the oil guide pipe 6 for cooling;

Step 3: The cooled oil enters the diversion copper tube 11 of the composite coil 1, the cooling oil in the diversion copper tube 11 cools the iron core 4 and the copper wire 12, and then the cooling oil flows from the bottom of the diversion copper tube 11 Flows into the bottom of the transformer box 5.

The oil guide tube 6 of the present invention transports the cooled oil to the diversion copper tube 11 of the composite coil 1, the power of the oil pump 2 forces the guide oil in the transformer case 5 to circulate, and the refrigeration unit 3 cools the guide oil, thereby generating The heat is taken away to realize heat exchange without affecting the normal operation of the transformer. The specific advantages are reflected in the following aspects:

The forced internal guide oil circulation cooling method is suitable for large-scale high-frequency, high-voltage, and large-function transformers, and has a good cooling effect. A good cooling effect greatly promotes the extension of the service life of the equipment.

The built-in duct type compound coil not only serves as the primary coil of the transformer, but also serves as the cooling oil circulation duct. The use of composite coils makes the cooling oil flow evenly distributed near the iron core and in the middle of the coils, and the fluidity is excellent, so as to obtain good heat exchange and avoid burning the coils and insulating layers due to local heating.

Due to the remarkable cooling effect of the forced internal guide oil circulation cooling method, the capacity of the cooling oil can be reduced, thereby reducing the volume of the transformer and greatly reducing the production cost.

The forced internal guide oil circulation cooling method adopts a refrigeration unit, which can reduce the external heat exchange device of the transformer, reduce the overall volume, save the power consumption of the cooling fan, and greatly reduce the operating cost.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (4)

1. one kind forces the hydronic high-power high-frequency transformer refrigeration system of interior guiding oil, it is characterised in that including transformation Device cabinet（5）, compound coil（1）, oil pump（2）And refrigeration unit（3）, compound coil（1）It is wrapped in the iron core of transformer（4） On, compound coil（1）And iron core（4）It is arranged on transformer case（5）It is interior, compound coil（1）Including water conservancy diversion copper pipe（11）And copper Line（12）, copper cash（12）It is wrapped in water conservancy diversion copper pipe（11）On, copper cash（12）With positioned at transformer case（5）The binding post in outside （7）It is connected；The transformer case（5）Bottom and oil guide pipe（6）It is connected, oil guide pipe（6）With oil pump（2）It is connected, Oil pump（2）Pass through oil guide pipe（6）With refrigeration unit（3）It is connected, refrigeration unit（3）Pass through oil guide pipe（6）With water conservancy diversion copper pipe （11）It is connected.

2. according to claim 1 force the hydronic high-power high-frequency transformer refrigeration system of interior guiding oil, it is special Sign is, the copper cash（12）For strand copper wire, copper cash is provided with insulating barrier；The oil guide pipe（6）For copper pipe, oil guide pipe（6） It is externally provided with insulating barrier.

3. according to claim 1 force the hydronic high-power high-frequency transformer refrigeration system of interior guiding oil, it is special Sign is, the refrigeration unit（3）It is made up of compressor refrigeration system, is fixed on transformer case（5）Outside.

4. force the hydronic high-power high-frequency transformation of interior guiding oil described in any one in claims 1 to 3 Device refrigeration system, it is characterised in that its refrigerating method is：

Step 1：Compound coil（1）Formed by Oil Guide copper pipe and strand copper wire are compound, compound coil（1）Twined as first winding It is wound on iron core（4）On, compound coil（1）On pass through copper cash（12）And binding post（7）It is connected with the output end of transformer, will Iron core（4）And compound coil（1）It is immersed in transformer case（5）Interior oil the inside；

Step 2：Oil pump（2）Pass through oil guide pipe（6）By transformer case（5）Interior oil pump enters refrigeration unit（3）Cooled down；

Step 3：Oil after cooling enters compound coil（1）Water conservancy diversion copper pipe（11）In, water conservancy diversion copper pipe（11）In cooling oil pair Iron core（4）And copper cash（12）Cooled down, then cooling oil is from water conservancy diversion copper pipe（11）Bottom inflow transformer cabinet（5）Bottom Portion.