JPS58165307A - Transformer - Google Patents

Abstract

PURPOSE:To improve reliability of cooling for winding and permit to adjust a degree of cooling capacity by a transformer wherein plural systems of coolant circulating circuits are provided for cooling ducts arranged in a set of foil wound coil. CONSTITUTION:Four cooling ducts 9A-9D obtained by bending flat ducts into an arcuate form are dispersely arranged in the inside of a low voltage winding 4 on the same circumstance, so that they are integrally wound in the winding. Then, two systems of coolant circulating systems A, B are provided for the low voltage winding 4. These soolant circulating circuits A, B comprise each a condenser 10, a coolant tank 11, a pump 12, a waveguide 13 and insulating pipes 14 to constitute respective circuits via the cooling ducts 9A-9D arranged in the inside of the winding 4.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention comprises a foil-wound wire in which a metal sheet and an insulating sheet are wound together, and a cooling duct through which a cooling medium is passed is provided within the winding. Built-in transformer 5 - O [Technical prohibition of the invention] A foil-wound transformer equipped with a foil-wound winding has a good space factor, is compact and compact.
c, several kV, several 10
Small capacity transformers with relatively low voltages of about 0 kVA have already been put into practical use and are widely used in the market.
(DK pressure 'Mi example Lki275 kV, 3t)
OMVA pressure device (: is also being researched to expand its application, but it has the maximum cooling capacity for 62 rolls ≦).

I'm wondering if it's possible to give the thin insulation ability to the winding effect.Such high-current, positive-capacity transformers have not yet been put to practical use, but this foil-wound transformer C: Line 1;
The cooling method for this is a so-called heat pipe type, in which the heat generated from the winding loss is directly cooled by incorporating a V inside one winding and feeding a refrigerant with excellent insulation properties.・ SL indicates a transformer of this type. 1 out of 1 is a tank filled with insulating oil or an insulating gas such as 8F-gas as an insulating medium.

The inner gc of this tank 1 is provided with two iron cores.

A low voltage winding 4 is wound around the outside of the main leg 2 m of the iron core 2 via an insulating tube 1 , and an island pressure winding 5 is wound around the outside of this low voltage winding 4 through an insulating barrier 6 .・These low voltage windings 4 and high voltage windings 5 are made by winding a metal sheet 2 such as aluminum foil and an insulating sheet 8 such as a resin film.・In addition, each winding 4, 5 is insulated by insulating oil or insulating gas 62 sealed in a tank.

A cooling duct 9 is circularly woven inside the low-voltage winding 4 and inside the hot-pressure winding 5. The cooling duct 9 has a cylindrical shape that does not form one electrical turn. For example, a flat duct made of a metal plate such as stainless steel is curved into a cylindrical shape, leaving the ghee Y tube, and winding it with 4°6 circles C; concentric circles ≦ 21 pieces or more! The windings 4 and 5 are wound around each other, or, for example, are bent into an arc shape.The windings 4 and 5 are arranged in such a way that the diurnal force is distributed in the same way.・Cooling ducts Liquid guide pipes 11 made of stainless steel or the like are provided on the upper and lower sides of the cooling duct 9, respectively, and these liquid guide pipes lj are connected to the upper and lower ends of the cooling duct 9 via insulated pipes 14. 18 is connected to the outside of the tank 1, and this liquid conduit pipe JJC is connected to the condenser 10.18 having a water pipe. Refrigerant tank ll and pump 12
The windings 4 and 4 are connected to each other so that a refrigerant such as Freon Ill or Fe12 is passed through the cooling duct 9. In the process of this refrigerant passing through the cooling duct 9, the winding 4. The heat generated by the refrigerant 5 is removed by the latent heat of vaporization of the refrigerant to cool the winding 4.5.The refrigerant coming out of the cooling duct 9 is cooled by water cooling and condensed into a liquefied refrigerant. is refrigerant tank 11C: stored pump jjc!
The cooling duct 9 is at the same potential as the winding 4.5, and the conducting liquid t11 is sent to the cooling duct 9 vertically, 5. ,.

In this way, the refrigerant circulation circuit that circulates the refrigerant to the cooling duct while passing through the condenser J0 is separated from the insulating medium in the pressure tank 1. Note that the leads and bushings of windings 4 and 5 are omitted in Figure 1. [Problems in the background art] In conventional transformers, each cooling duct provided in foil-wound windings, that is, windings 4 and 5 The refrigerant circulation circuit connected to
As shown in the figure, C: one system is provided in common for each winding 4°5. Alternatively, as shown in Figure -2, one system is provided for each winding. Note that FIG. 2 shows the winding 4 as an example.

In this example, the cooling duct 9 is a plurality of arc-shaped ducts)
jA to 9D are arranged in a distributed manner on the circumference. In this way, one common refrigerant circulation circuit is provided for the windings 4' and 51. Alternatively, one refrigerant circulation circuit is provided for each set of windings 46.
If the system is configured with a refrigerant circulation circuit, if the refrigerant circulation circuit breaks down, it will not be possible to cool the windings 4.5C at all, and there will be gaps in the cooling reliability. For transformers with multiple rated capacities in one unit, l
Since the cooling capacity of the system is fixed, 1: If the rated capacity of the transformer is changed, C: Winding 4 of the refrigerant circulation circuit will change accordingly.
．． Therefore, the refrigerant circulation circuit must constantly cool the winding 45.5 with a capacity corresponding to the maximum rated capacity of the transformer, and the refrigerant efficiency cannot be adjusted.
[Objective of the Invention] The present invention provides a transformer in which the cooling of the foil-wound windings by the refrigerant circulation circuit is highly reliable, and the cooling capacity of the refrigerant circulation circuit can be adjusted. O [Summary of the Invention] The transformer of the present invention has multiple coil windings for one set of foil windings. [Embodiments of the Invention] The present invention will be described below.

The -t&pressure device of the present invention has a foil-wound structure in which a metal sheet 7 and an insulating sheet FB are wound around an iron core 2 provided inside a tank l filled with an insulating medium, as shown in the first factor. A cooling duct 91 is provided inside the C second winding 4.6, in which a low voltage winding 4 and a high voltage winding 5 are wound. Multiple systems are provided for each area.

An embodiment of the transformer according to the present invention will be explained using Example I: the case of the low voltage winding 4 shown in Fig. 913.

In this embodiment, the cooling duct 9 is formed by bending a flat duct into an arc shape. 4 cooling ducts 9, 9 to 3.9
C, 9D low-voltage winding 4 internal direct: 6 pieces are arranged at 12 locations on the same circumference and wound.In addition, in Fig. 3, the iron gear ξ"l:" is the highest winding wire 5. Omitted/Also, low pressure 4
indicates only the metal sheet 1, and the insulating sheet 8 is abbreviated as 1.
In the embodiment shown in the following three cases, two refrigerant circulation circuits A and B are provided for the low-voltage winding 46; Refrigerant tank 1
1. Pump 13. A condenser 10, which has a liquid guiding pipe 11 and an insulating pipe 14, and constitutes a circuit via a cooling duct mA-ID provided inside one winding 4. The refrigerant tank 71 and the pump 11 are provided outside the tank 1, and the liquid guide pipe 1
1 is installed above and below the low-voltage winding 4 inside the tank 1, and condenses at the outside of the tank 1. The insulating pipe 14 connects the liquid guide pipe 11 on the lower side of the winding 4 and the refrigerant inlet provided at the lower end of the cooling duct) GA~9D, and also connects the guide tube 11 on the upper side of the winding and the cooling duct 9A~
9D is connected to the refrigerant outlet provided at the upper end of 9D.Here, in one refrigerant circulation circuit AC, the lower side of the first winding 4 and the liquid guide pipe 11 of ll:,=@ are connected to the cooling duct cum, #C
11! :1. , the other refrigerant circulation oil path B≦ is connected to the rope inlet and the refrigerant outlet via insulated pipes 14, respectively.
:The liquid guide pipe 11 is a cooling duct) # B T #
It is connected to the refrigerant inlet and refrigerant outlet of D via an insulated pipe 14.

The two cooling ducts of #D that are arranged opposite to each other are connected to #A and C, and the other refrigerant circulation circuit B is arranged opposite to each other. Two cooling ducts #B*
tDt: respectively connected - and in one cooling circulation circuit, the refrigerant is pumped to the pump 116; NIm is the cooling duct) #A
When passing bt in #9C, cool 1 birch 4 and further.
Out duct #A, -U or b #&! IIaA Eve 1-1
4-4 After the upper liquid guide pipe 'I jt-ri11110j-1' 1111 C; Refrigerant flow IIf: Noise pump 1
From the cooling duct 9 again, the refrigerant is sent to the pump 11.
(: From the liquid guide pipe 11. Through the insulated pipe 14vt to cooling duct eB, tD inside 4: Send, cooling duct #H, #D
4amaw cooled with iq algae, and then into the sabot~wholesale dagut ttB,
Exit from eD and pass through insulated pipe 14.4 faulty lightning 11, mm
It is wrapped 6 times in the vessel 10 ~ through the rope tank ll, and then pumped again to the pump 12
This is sent to cooling tanks #B and #D.
Each refrigerant circulation circuit A, B cools the winding 4v while circulating the refrigerant through the cooling duct gA-D.

The cooling capacity for windings d and C of each refrigerant circulation circuit A and B is 1, for example, half the maximum cooling capacity that must cool the entire winding 4 under the maximum rated capacity of a three-phase transformer. Therefore, if the three-phase transformer has a certain footfall ili, then two refrigerant circulation circuits A and Bv are operated to cool the low voltage winding i14.Three-phase transformer For example, if C has a rated capacity of two types, maximum and half, the maximum rated capacity C; when set, two refrigerant circulation circuits A and B are operated at the same volume and wound at the maximum cooling capacity. @A'
Rated capacity of half the maximum capacity @1: When set, only one of the cooling circulation circuits A and B is operated to cool the winding 4 with a cooling capacity of half the maximum cooling capacity.・Like this (: Rated capacity of three-phase transformer -: Winding 4 according to
The cooling capacity for both refrigerant circulation circuits A and H can be adjusted.Reason I: If one of the refrigerant circulation circuits A or H malfunctions and becomes inoperable, eU is not malfunctioning. Winding 4 is operated by operating the other refrigerant circulation circuit.
(It is possible to continue cooling the pair of wires. Therefore, it is possible to prevent the cooling of the first winding 4 from stopping completely, and it is possible to perform reliable cooling.) In the case of the wire 4, two Cs were described, but the high voltage winding 5 (also in the second case, multiple systems of refrigerant circulation circuits are provided, and each refrigerant circulation circuit is connected to two cooling ducts 95 provided inside the winding 5). It is likely that the structure is to cool the wire 5.In addition, the inside of the 1st winding has a structure of a duct, which has a 6 cylindrical shape 1'%, , 'k'txa, □□, multiple 11 ducts placed concentrically in an angular arc shape. □, □ knee 1, l concentric circle circumferential direction g; Part C can be divided into two parts, etc. - The refrigerant circulation circuit is not limited to two systems, but three or more systems can be installed.The connection between the refrigerant circulation circuit and the cooling duct is 1.
In order to cool the windings in a well-balanced manner depending on the conditions such as the number of circuits and duct configuration, each refrigerant circulation circuit may be connected to each other via a valve and one circuit may be selected. [Effects of the Invention] The transformer of the present invention has a plurality of refrigerant circulation circuits for one set of foil-wound windings (L) and the provided cooling tank (C), so the reliability of cooling for one winding is high; By adjusting the number of operating refrigerant circulation circuits, the cooling capacity can be adjusted according to the rated capacity of the transformer.

4.831NF[jli)'klQ Ming No. 11/ is a longitudinal straight ET showing an example of a conventional → transformer device.
il bubble, Ii2' is a plan view showing another example of the connection between the foil winding and the 11 medium circulation circuit in the conventional → transformer device,
I! Figure 3 is a cross section showing one embodiment of the connection between the foil-wound winding and the refrigerant circulation circuit in the transformer device of the present invention. Tank, 2 Iron core, 4...・Low voltage winding, 5・
...High voltage winding, 7...Metal sheet, 8...Insulating sheet.

9 * 9 A~9D...Cooling Doug) "," J
o... Condenser.

71... Refrigerant tank, 12... Pump, 13...
Liquid guide pipe, 14... Insulated pipe QA, B... Refrigerant equipment m
Hiroro / Applicant's Attorney Patent Attorney Dozuo Shiki Hiko No. 1 Figure 0

Claims (1)

[Claims] It is equipped with a foil-wound winding in which a metal sheet and an insulating sheet are overlapped and wound, and the inside of this foil-wound winding is provided with a cooling duct through which the refrigerant flows. The transformer is characterized in that a plurality of refrigerant circulation circuits to be circulated to the cooling duct are provided for each pair of the foil-wound windings, and these refrigerant circulation circuits are connected to the cooling duct as conduits. Vessel◎