JP2008108920A - Gas insulation stationary induction electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas insulation stationary induction electric apparatus of an indirect switching system which is easily transported, is intended to simplify an assembly at a site and to drastically shorten the time necessary for the completion of the assembly, and is economically excellent. <P>SOLUTION: The gas insulation stationary induction electric apparatus accommodates a main transformer 10 and an in-series transformer 11 in a transformer tank 19. This main transformer 10 is constituted of a primary winding 12, a secondary winding 13 on the side of the main transformer 10, and a tap winding 14. Further, the in-series transformer 11 is constituted of a secondary winding 15 on the side of the series transformer connected in series to the primary winding 12 of the main transformer 10, and an excitation winding 16 connected to the tap winding 14 of the main transformer 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an indirect switching type gas-insulated static induction electrical apparatus composed of a main transformer and a series transformer, which performs cooling by circulating an insulating and cooling medium such as SF ₆ gas.

  Conventionally, gas-insulated substation equipment has been widely applied to underground substations in urban areas because of disaster prevention requirements. Along with the increase in power demand in recent years, the transmission system has been increased in voltage and capacity, and gas insulation transformers have been used up to 275 KV-300 MVA class. Urban underground substations, where gas-insulated transformers are often used, often have harsh transportation conditions, and the dimensions and weight of their transportation units have become issues.

  Conventionally, in the case of a three-phase transformer, for example, such a transformer is divided and transported as three or more unit transformers, and each unit transformer is connected and connected by a common duct in the field to form a three-phase connection. By doing so, it was a three-phase transformer. In particular, in the case of an indirect switching type gas-insulated transformer, not only a single-phase tank that houses the main transformer but also a tank that houses the series transformer is necessary, and there are many transportation units and it is necessary for local installation. There was a problem that the dimensions were large.

  12 and 13 show examples of conventional indirect switching type gas-insulated static induction electrical equipment. As shown in the connection diagram of FIG. 12, a main transformer having a primary winding 32, a main transformer side secondary winding 33, and a tapped tertiary winding 34 is accommodated in the main transformer tank 30. Further, a series transformer side secondary winding 35 and a series transformer having an excitation winding 36 are accommodated in the series transformer tank 31, and the series transformer side secondary winding 35 is a primary winding of the main transformer. A series transformer connected in series with line 32 and having an excitation winding 36 is connected to tap winding 34 of the main transformer.

The main transformer, the series transformer, and the on-load tap changer 38 are connected by a tap changer connection lead 37, and the tap winding 34 is switched to change the output of the main transformer. .
Japanese Patent Laid-Open No. 08-124768

  In the conventional gas-insulated static induction electrical apparatus as described above, a lead for connecting the main transformer, the series transformer, and the tap changer is required, and a duct for storing the lead is required. In particular, the main transformer and the series transformer are separately housed in the main transformer tank and the series transformer tank, respectively, so that a lead and a duct are required between these tanks.

  Therefore, due to the increase in the number of parts, it takes time to assemble in the factory test, disassemble and assemble in the field, and to reassemble in the duct. This has led to an increase in the local construction period, which is not only economically disadvantageous, but also has a problem from the viewpoint of ensuring quality that the exposure time in the air of the insulator, which is the internal component of the transformer, becomes long.

  In addition, it is necessary to transport and install not only the tank containing the main transformer and tap changer, but also the tank containing the series transformer, so there are many local transportation units, and the installation dimensions are large and economical. There was a problem.

  The present invention has been proposed to solve the above-described problems of the prior art, and its purpose is to facilitate transportation, simplify on-site assembly, and greatly reduce the assembly period. Another object of the present invention is to provide an indirect switching type gas-insulated static induction electrical device that is economically superior.

  To achieve the above object, a gas-insulated static induction electrical device according to the present invention is connected in series with a main transformer having a primary winding, a secondary winding and a tap winding, and a primary winding of the main transformer. A series transformer having a secondary winding and a primary winding connected to the tap winding of the main transformer, and changing the output of the main transformer by switching the tap of the tap winding In the insulated static induction electrical device, the main transformer and the series transformer are housed in a single tank together with an insulating gas.

  According to the aspect as described above, the main transformer and the series transformer are housed in the transformer tank, and the conventional main transformer and the series transformer, respectively, in particular, the main transformer tank and the series transformer, respectively. Leads and ducts that connect the tanks to each other because they are separately stored in the container tank are not necessary. This eliminates the need for assembly, disassembly time and reassembly at the factory test, and lead connection work in the duct, shortening the local construction period and making it economically superior. Furthermore, since a tank containing the series transformer is not required, the number of tanks to be transported is reduced, and the installation size at the time of assembly at the site is reduced, which is economically superior.

  According to the present invention as described above, in the gas-insulated static induction electrical equipment of the indirect switching method, by storing the series transformer in the main transformer tank, it becomes easy to transport and further simplifies on-site assembly. It is possible to provide a gas-insulated static induction electrical device that is economically superior by greatly shortening the assembly period.

  Hereinafter, typical embodiments according to the present invention will be specifically described with reference to FIGS.

(1) First Embodiment FIGS. 1 and 2 show a gas-insulated static induction electrical device according to a first embodiment of the present invention. As shown in the connection diagram of FIG. 1, the gas-insulated static induction electrical device according to this embodiment is configured such that a main transformer 10 and a series transformer 11 are collectively stored in a transformer tank 19. In other words, what was conventionally stored separately in the main transformer tank and the series transformer tank is collectively stored in the transformer tank 19.

  The main transformer 10 includes a primary winding 12, a main transformer side secondary winding 13, and a tap winding 14. The series transformer 11 includes a series transformer-side secondary winding 15 connected in series with the primary winding 12 of the main transformer 10, an excitation winding 16 connected to the tap winding 14 of the main transformer 10, Consists of.

  The main transformer 10, the series transformer 11, and the on-load tap changer 18 are connected by a tap changer connection lead 17. A tap winding 14 is provided at a connection portion between the main transformer 10 and the tap changer connection lead 17, and the output of the main transformer 10 is changed by switching the tap of the tap winding 14. It has become.

  FIG. 2 shows an embodiment where the capacity of the transformer is large and it is appropriate to construct a three-phase transformer by connecting three single-phase tanks to each other. Three single-phase transformers containing the transformer 10 and the single-phase series transformer 11 are arranged, and the tanks and the on-load tap changer 18 are connected by the lead connection duct 20.

  That is, as shown in FIG. 13, the main transformer and the series transformer are conventionally housed separately in the main transformer tank and the series transformer tank, so that even when this is configured in three phases, It is necessary to provide a lead between the main transformer and the series transformer, and between these and the tap changer, and further to provide a duct for storing the lead. In this embodiment, the single-phase main transformer 10 and The single-phase series transformer 11 can be housed in a single-phase transformer, and three of them can be arranged side by side.

  In FIG. 2, the series transformer 11 shows an example in which the winding surface is opposed to the side leg of the main transformer 10, but the orientation of the main transformer 10 and the series transformer 11 is shown. Is not limited to this. Further, the arrangement of the single-phase tanks is not limited to the arrangement in which the single-phase tanks are arranged in a line as shown in FIG. 2, but the single-phase tanks may be arranged in a radial manner, or two single-phase tanks and a single-phase tank may be loaded. You may arrange | position so that a tap switch may be opposed, The arrangement | positioning is not limited.

  According to the present embodiment having the above-described configuration, the main transformer 10 and the series transformer 11 are housed in the transformer tank 19 so as to make the main transformer and the series transformer in particular, respectively. Leads and ducts for connecting the tanks to each other because they are separately housed in the main transformer tank and the series transformer tank become unnecessary. This eliminates the need for assembly, disassembly time and reassembly at the factory test, and lead connection work in the duct, shortening the local construction period and making it economically superior.

  Furthermore, since a tank containing the series transformer is not required, the number of tanks to be transported is reduced, and the installation size at the time of assembly at the site is reduced, which is economically superior.

(2) Second Embodiment FIG. 3 shows a gas-insulated static induction electrical apparatus according to a second embodiment of the present invention. The connection diagram in the second embodiment is the same as that shown in FIG.

  In this embodiment, the capacity of the transformer is small, and it is appropriate to configure a three-phase main transformer and a three-phase series transformer in one transformer tank. As shown in FIG. 3, a three-phase main transformer 10, a three-phase series transformer 11, and a load tap changer 18 are housed in a transformer tank.

  In FIG. 3, the series transformer 11 and the on-load tap changer 18 show an example in which the winding surface faces the side legs of the main transformer 10, but the main transformer 10, the series transformer The orientation of the device 11 and the on-load tap changer 18 is not limited to such a mode, and the design can be changed as appropriate.

  According to the present embodiment having the above-described configuration, the three-phase main transformer and the three-phase series transformer are accommodated in one transformer tank, and thus, similarly to the first embodiment, Leads and ducts that house the leads required for connection between the main transformer and series transformer and between the series transformer and tap changer are no longer required, assembly in factory testing, disassembly time and on-site reassembly There is not much work for connecting leads in ducts.

  This shortens the construction period at the site and makes it economically superior. Furthermore, since a tank containing the series transformer is not required, the number of tanks to be transported is reduced, and the installation size at the time of assembly at the site is reduced, which is economically superior.

(3) Third Embodiment FIG. 4 shows a gas-insulated static induction electrical apparatus according to a third embodiment of the present invention. The present embodiment is characterized in the arrangement configuration of the main transformer and the series transformer in the transformer tank. Specifically, the lower structure 21 provided at the bottom of the main transformer 10 is arranged in the horizontal direction. The series transformer 11 is disposed thereon and accommodated in the transformer tank 19.

  In the on-site assembly process, the timing of arranging the series transformer 11 in the extended portion of the lower structure 21 of the main transformer 10 may be before the main transformer 10 is stored in the tank or after it is stored. It is not limited. Moreover, although the winding of the series transformer is arrange | positioned so that the iron core side leg of a main transformer may be opposed in FIG. 4, it is not limited to the direction.

  According to the present embodiment having the above configuration, the main transformer and the series transformer are integrated in the lower structure of the main transformer, so that the main transformer and the series transformer are stored in the tank. Work can be done at the same time. Furthermore, since the main transformer and the series transformer can be simultaneously performed when performing the drying process of the insulator used in the transformer, the drying process time is shortened and the handling is facilitated.

  In addition, the positioning pin attached to the tank, which is necessary for fixing the series transformer to the tank, becomes unnecessary, and the tank manufacturing time is shortened.

(4) Fourth Embodiment FIG. 5 shows a gas-insulated static induction electrical apparatus according to the fourth embodiment of the present invention. This embodiment is characterized by the arrangement configuration of the main transformer and the series transformer in the transformer tank. Specifically, the series transformer 11 is arranged above the main transformer 10, and this The main transformer 10 and the series transformer 11 are housed in a transformer tank 19.

  According to this embodiment having the above-described configuration, in addition to the effects of the first embodiment, the installation area of the transformer tank is reduced, the installation area of the transformer in the field is reduced, and the installation foundation is manufactured. Less time and materials are needed.

(5) Fifth Embodiment FIG. 6 shows a gas-insulated static induction electrical apparatus according to the fifth embodiment of the present invention. The gas-insulated static induction electrical device according to the present embodiment is the same as the gas-insulated static induction electrical device according to the third embodiment except that the main transformer 10 and the series transformer 11 are provided with a gas stop plate 24 in common. It is. The gas stopper plate 24 is provided in the horizontal direction below the tank so as to partition the transformer tank.

  The operation of the gas stop plate 24 is as follows. That is, in the gas-insulated static induction electrical apparatus of this embodiment, a cooling pipe (not shown) is provided in the transformer tank 19, and this cooling pipe is connected to a cooling device (not shown) including a cooler and a blower. The insulating gas cooled by this cooling device is sent to the lower part of the transformer tank through the cooling pipe. This cooling gas flows in from the lower part of the transformer tank, and is shunted to the transformer winding and the iron core by the gas stop plate 24 partitioned in the transformer tank so that it rises while cooling the transformer and flows to the upper part of the tank. It has become.

  Since the main transformer 10 and the series transformer 11 have different iron core and winding dimensions, in this embodiment, an arrangement example of the main transformer 10 and the series transformer 11 in the third embodiment. The height of the extended portion of the lower structure 21 of the main transformer on which the series transformer 11 is mounted is adjusted to match the mounting position of the gas stopper plate 24.

  According to the present embodiment having the above-described configuration, the gas stopper plate that has been conventionally independently attached to the main transformer and the series transformer can be commonly attached to the main transformer and the series transformer. Therefore, in addition to the effects of the third embodiment, the number of parts is further reduced and the structure is simplified, so that the assembly time is shortened.

(6) Sixth Embodiment FIG. 7 shows a gas-insulated static induction electrical apparatus according to a sixth embodiment of the present invention. Similarly to the gas-insulated static induction electrical device of the third embodiment, the gas-insulated static induction electrical device of the present embodiment extends the lower structure 21 of the main transformer, and the series transformer 11 is mounted thereon, The upper structure 22 provided in the main transformer 10 is extended and fixed to the upper part of the series transformer 11. That is, the main transformer 10 and the series transformer 11 are sandwiched and fixed between the lower structure 21 and the upper structure 22.

  According to the present embodiment having the above-described configuration, the main transformer and the series transformer are firmly integrated with each other in the lower structure and the upper structure of the main transformer. Thus, the main transformer and the series transformer can be lifted simultaneously by the lifting wire 23, and the time required for handling when performing the storing operation in the tank and the drying process can be shortened.

  Further, since the main transformer and the series transformer are assembled together, the connection process between them becomes easy, and the working time is shortened.

(7) Seventh Embodiment FIG. 8 shows a gas-insulated static induction electrical apparatus according to the seventh embodiment of the present invention. In this embodiment, the single-phase transformer tanks 19 shown in the first embodiment are arranged adjacent to each other and connected to each other by a flange.

  According to the present embodiment having the above-described configuration, the duct storing the connection leads between the single-phase transformers and between the load tap changers becomes unnecessary, and the connection leads are also shortened. There is little, the amount of transported goods decreases, and the assembly time in the field decreases.

  Further, since the single-phase tanks are arranged close to each other and are firmly connected, the transformer itself is less likely to generate vibrations and is strong against external vibrations such as earthquakes.

(8) Other Embodiments The present invention is not limited to the modes shown in the above embodiments, and includes, for example, the following modes. For example, in addition to the configuration shown in FIG. 1 in the first embodiment, as shown in FIG. 9, a lightning protection element 40 may be attached to the tap winding 14 of the main transformer 10. Thus, when a lightning test voltage is applied, a high voltage may be generated at a terminal whose potential is not fixed by tap connection. However, since the generated voltage is limited by the lightning protection element 40, insulation reliability is improved. improves.

  On the contrary, as shown in FIG. 10, it is also possible to configure the lightning protection element 40 to be attached to the series transformer side secondary winding 15 of the series transformer 11. Even with such a configuration, when a lightning test voltage is applied and a high voltage is generated at the connection point between the main transformer secondary winding and the series transformer secondary winding, the generated voltage is limited by the lightning protection element 40. Therefore, the insulation reliability is improved.

  In the third embodiment, the main transformer and the series transformer are integrally formed in the lower structure of the main transformer in the transformer tank. However, the present invention is not limited to such an embodiment. 11, the main transformer 10 and the series transformer 11 may be independently installed in the transformer tank 19.

  According to such an aspect, since the main transformer and the series transformer are independently arranged in the transformer tank, the main transformer and the series transformer are accommodated in the tank in the assembly work at the site. In each case, it can be carried out independently, the equipment required for handling is simplified, and the work becomes easy. Moreover, since the assembly work of the main transformer and the series transformer can be performed independently, the work time is shortened.

  Moreover, it is possible to provide a gas thermometer for measuring the gas temperature in the transformer tank in the upper part of the transformer tank in the transformer tank in each embodiment. More specifically, in the vicinity of the portion where the transformer tank and the gas outlet side cooling device piping provided at the upper portion of the transformer tank are connected to send the gas that has passed through the tank to the cooling device, the gas Install a thermometer. According to this, even when a gas temperature distribution occurs in the upper part of the transformer tank due to the difference in the amount of heat generated by the series transformer due to the tap connection and the difference in the amount of gas flowing to the main transformer and the series transformer, A stable value is obtained as the temperature.

  The gas used for insulation and cooling enclosed in the transformer tank may be, for example, sulfur hexafluoride, nitrogen, air, or a mixed gas thereof. According to this, when sulfur hexafluoride is used as the sealing gas, the insulation performance is high, so that the insulation performance can be greatly improved and the equipment dimensions can be reduced. Further, when nitrogen or air is used as the sealed gas, it is a gas having a small warming potential, and therefore has a feature that it has a small influence on the global environment even when released into the atmosphere due to an accident or the like.

  Furthermore, even when nitrogen or air is mainly used as the sealing gas and a small amount of sulfur hexafluoride having high insulation performance is added as the additive gas, the earth when released into the atmosphere is the same as when the sealing gas is nitrogen or air. There is a feature that the size of the equipment is reduced because the influence on the environment is small and the insulation performance is improved.

1 is a connection diagram of a gas-insulated static induction electrical device according to a first embodiment of the present invention. 1 is a plan view showing a configuration of a gas-insulated static induction electrical device according to a first embodiment of the present invention. The top view which shows the structure of the gas insulation static induction electric equipment which concerns on the 2nd Embodiment of this invention. The side view which shows the structure of the gas insulation static induction electric equipment which concerns on the 3rd Embodiment of this invention. The side view which shows the structure of the gas insulation static induction electric equipment which concerns on the 4th Embodiment of this invention. The side view which shows the structure of the gas insulation static induction electric equipment which concerns on the 5th Embodiment of this invention. The side view which shows the structure of the gas insulation static induction electric equipment which concerns on the 6th Embodiment of this invention. The top view which shows the structure of the gas insulation static induction electric equipment which concerns on the 7th Embodiment of this invention. The connection diagram of the gas insulation static induction electric equipment concerning other embodiments. The connection diagram of the gas insulation static induction electric equipment concerning other embodiments. The side view which shows the structure of the gas insulation static induction electric equipment which concerns on other embodiment. Connection diagram of conventional gas-insulated static induction electrical equipment. The top view which shows the structure of the conventional gas insulation static induction electric equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Main transformer 11 ... Series transformer 12 ... Primary winding 13 ... Main transformer side secondary winding 14 ... Tap winding 15 ... Series transformer side secondary winding 16 ... Excitation winding 17 ... Tap changer Connection lead 18 ... Tap changer 19 under load 19 ... Transformer tank 20 ... Lead connection duct 21 ... Lower structure 22 of main transformer ... Upper structure 23 of main transformer ... Lifting wire 24 ... Gas stop plate 30 ... Main transformer tank 31 ... Series transformer tank 32 ... Primary winding 33 ... Main transformer side secondary winding 34 ... Tap winding 35 ... Series transformer side secondary winding 36 ... Excitation winding 37 ... Tap switch connection lead 38 ... Load tap changer 40 ... Lightning protection element

Claims (13)

A primary transformer having a primary winding, a secondary winding and a tap winding; a secondary winding connected in series with the primary winding of the main transformer; and a primary winding connected to the tap winding of the main transformer A gas-insulated static induction electrical device that changes the output of the main transformer by switching the tap of the tap winding,
A gas-insulated static induction electrical apparatus, wherein the main transformer and the series transformer are housed in a single tank together with an insulating gas. A load tap changer that switches the tap of the tap winding in a state where the transformer is excited or a load is applied;
The tank containing the main transformer and the series transformer is a single phase tank, and this single phase tank is arranged adjacent to three units,
2. The gas-insulated static induction according to claim 1, wherein each single-phase device tank and the on-load tap changer are connected with leads, and a three-phase device is configured by providing a duct for storing the leads. Electrical equipment.   The tank containing the main transformer and the series transformer contains a load tap changer that switches taps of the tap winding in a state where the transformer is excited or a load is applied. The gas-insulated static induction electrical device according to claim 1. The main transformer and the series transformer arranged adjacent to each other are commonly provided with a lower structure that is a foundation for supporting them,
3. The gas-insulated static induction electrical device according to claim 1, wherein the gas-insulated static induction electrical device is integrally formed in the tank via the lower structure.   3. The gas-insulated static induction electrical device according to claim 1, wherein the main transformer and the series transformer are independently arranged in the tank. 4.   3. The gas-insulated static induction electrical device according to claim 1, wherein the series transformer is disposed in an upper portion of the main transformer in the tank. In the tank, provided with a gas stop plate for diverting the insulating gas flowing into the tank from the cooling device to the winding and the iron core,
The gas-insulated static induction electrical device according to claim 1 or 2, wherein the gas stop plate is provided in common to the main transformer and the series transformer.   The gas-insulated static induction electrical apparatus according to claim 1 or 2, wherein the main transformer and the series transformer are integrally formed by fixing the upper and lower parts of the main transformer and the lower part by a common member. . The tank containing the main transformer and the series transformer is a single phase tank, and a plurality of the single phase tanks are arranged adjacent to each other.
The gas-insulated static induction electrical device according to claim 1, wherein the plurality of single-phase tanks are connected by a flange.   The gas insulated static induction electrical apparatus according to any one of claims 1 to 9, wherein a lightning protection element is provided in the tap winding of the main transformer.   The gas-insulated static induction electrical device according to any one of claims 1 to 9, wherein a lightning protection element is provided in a secondary winding of the series transformer. A cooling pipe on the gas inflow side is connected to the lower part of the tank, and a cooling pipe on the gas outflow side is connected to the upper part of the tank,
The gas-insulated stationary apparatus according to any one of claims 1 to 11, wherein a gas thermometer for measuring a gas temperature in the tank is provided in the vicinity of a connection portion with the cooling pipe on the gas outflow side. Induction electrical equipment.   The gas-insulated static induction electrical device according to any one of claims 1 to 12, wherein the insulating gas sealed in the tank is sulfur hexafluoride, nitrogen, air, or a mixed gas thereof. .

Images