JPH06260354A - High voltage electric equipment - Google Patents

Abstract

PURPOSE:To improve insulation performance against a high voltage lead by providing with a duct into which a lead of high voltage that connects a plurality of tanks penetrates, assigning a through type current transformer near the outlet of the duct, and, providing with an electrostatic shield, facing the lead of the through type current transformer. CONSTITUTION:A duct disconnection part 12 is provided, so that the part of an oil duct 5 provided so that it projects itself above a part of the main body tank may be dismounted far separate transportation. Further, the through type current transformer 11 is assigned not on the side of main body tanks 1 and 2 of the duct disconnection part 12 but on the side of a lead-out part 3. In assignment of the through type current transformer 11, the part facing a high voltage lead 7 is with no projection. Thus, equipments can be manufactured with dimension within transportation limit which could not be overcame with conventional technology of supporting structure for a through type current transformer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage electric device such as a transformer or a reactor, and more particularly to a high-voltage electric device having an improved structure for mounting a current transformer provided at an electrical outlet.

[0002]

2. Description of the Related Art In the case of a 1000 kV class UHV transformer,
The three-phase capacity is 3000 MVA, and the single-phase capacity is 1000 MVA
Since it exceeds the transportation limit, it cannot be manufactured as a single device. Therefore, as shown in FIG. 5, two tanks 1,
Stored in two parts, and connected between them with oil ducts 5 and 6,
It is necessary to penetrate through the high voltage leads 7 and 8 and electrically couple them.

Generally, in electrical equipment, a through-type current transformer is usually provided at the electrical outlet of the equipment for the purpose of protecting and controlling the equipment. When the tank is divided into two tanks 1 and 2 like the UHV transformer of FIG. 5, the current transformer needs to be provided at the electric outlets of the tanks 1 and 2, so that the oil of FIG. It will be provided in the duct 5.

Such an oil duct and a penetrating current transformer are
Devices that are used by combining locally manufactured units because of special transportation limits, such as underground substation transformers
It is also used in reactors. FIG. 6 shows a conventional structure for mounting the through-type current transformer 11 near the outlet of electricity when the main body is not divided into two tanks.

Referring to the figure, 1 is the vicinity of the electricity outlet of the main body tank. Reference numeral 3 denotes a lead-out portion, and a bushing is generally used. 11 is a penetrating current transformer. Reference numeral 5 denotes an oil duct provided by projecting a part of the main body tank for inserting the penetrating current transformer into the lead-out portion. Reference numeral 17 is a support plate, and 18 is a holding plate, both of which are devices for supporting and fixing the through-type current transformer.

[0006]

A method of supporting and fixing a through-type current transformer as shown in FIG. 6 is an electric type of a type in which a main tank is divided for the purpose of transportation limitation like a UHV transformer shown in FIG. When applied to equipment, there are the following problems.

(1) In the case of a UHV transformer, the most important focus of the technology for grouping devices is how to pack them into compact devices that are within the transportation limit. An oil duct 5 provided by projecting a part of the main body type 1 as shown in FIG.
It is a very troublesome person.

(2) Therefore, the through current transformer may be inserted into a lead wire of an appropriate portion in the main body tank instead of being inserted into the lead-out portion 3 corresponding to the outlet of electricity, but a high voltage of UHV. However, because of this, electrical insulation cannot be maintained.

In order to solve the above-mentioned problems, the present invention solves the problem of transportation limitation by improving the supporting structure of the through-type current transformer, and can also be used for the high voltage of UHV transformers. The purpose is to get.

[0010]

According to the present invention, a part of an oil duct provided by projecting a part of a main body tank is detached and separately sent for transportation.
In addition, the space and structure of the penetration type current transformer storage part was devised so that there would be no problem in insulation against high voltage leads.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a UHV transformer in FIG.
It is a sectional view corresponding to. Reference numerals 1 and 2 are main tanks of the transformer divided into left and right. Reference numeral 3 is a lead-out portion for taking out a high voltage on the UHV side, 5 is an oil duct connecting between the main body tanks, and 7 is a UHV-side high-voltage lead serving as an electric passage from the contents of the main body tank to the lead-out portion 3. Again 500k
The V side also has a lead portion, an oil duct, and a high voltage lead that perform the same function as the UHV side. 9 and 10 are an iron core and windings which are the contents of the transformer body. Further, in FIG. 1, 11 is a penetrating current transformer, and 12 is a duct disconnecting portion provided so that the oil duct 5 can be disconnected from the main body tanks 1 and 2. That is, in the present invention, (1) the duct separating portion 12 is provided so that the portion of the oil duct 5 provided by projecting a part of the main body tank can be detached and separately sent for transportation. (2) Place the through-type current transformer 11 in the duct separation part 12
It is provided not on the main body tanks 1 and 2 but on the lead-out portion 3 side.

(3) When arranging the through-type current transformer 11, the portion facing the high-voltage lead 7 should not have a projection like the conventional through-current transformer mounting device of FIG. .

FIG. 2 is an enlarged detailed view of the main part of FIG. 3 and 4 show in more detail the part of the support device of the feedthrough current transformer. In this structure, the names and roles of 1 to 12 are the same as those in FIGS. The differences are as follows.

Reference numeral 13 is a storage box A for a through-type current transformer, which is provided in the oil duct 5. Reference numeral 15 is a storage box B, which is provided in double in the storage box A and is supported by a mounting bracket 14. 16 is an electrostatic shield, which is provided on the inner surface of the oil duct. A duct separating portion 12 is provided so that the oil duct 5 can be detached and separately sent for transportation. For this purpose, the through-type current transformer is moved toward the oil duct 5 to be separately sent.
At this time, if the conventional support structure for the through-type current transformer of FIG. 6 is adopted as it is, the projections of the portion facing the high-voltage lead will be adversely affected and the insulation cannot be maintained. Therefore, storage boxes A and B are provided so that the support structure does not have a protruding shape, and the penetrating current transformer 11 is attached to the wall surface of the oil duct 5 so as to project to the outer peripheral side. Electrostatic shield on the circumference
The provision of 16 ensures that the through-current transformer and its supporting structure do not exist in the electric field with respect to the high voltage lead 7. That is, if there is no protrusion on the inner wall surface of the oil duct 5 facing the high-voltage lead 7, the electric field is not concentrated electrically, so that the insulation is maintained.

By the way, the structure of the electrostatic shield 16 of FIG. 4 is attached to the left end portion of the drawing as an embodiment, and not attached to the right end portion. This is a functional condition,
If the storage box A13 or the storage box B15 is integrated with the electrostatic shield 16 to form an electric path around the iron core of the through-type current transformer, the error characteristic of the current transformer is deteriorated. Therefore, this structure is used so that no path is created.

In FIG. 4, a storage box B15 has been proposed as a structure for supporting the through-type current transformer 11 in the storage box A13, but another support structure may be adopted if the purpose is achieved. Also, U
Although it is intended for HV transformers and reactors, it can also be used for other split-type electric devices that use oil ducts, such as 500 kV transformers and reactors, transformers and reactors for underground substations, and the like. Furthermore, although the present invention is intended for oil-filled equipment, it can also be applied to gas-insulated transformers and reactors.

[0017]

As described above, according to the present invention, it becomes possible to manufacture a device with a size within the transportation limit which cannot be overcome by the supporting structure of the through type current transformer of the prior art. Also, UH
In a high-voltage device such as V, a structure has been realized that can electrically insulate the lead of the lead-out portion of the support structure of the through current transformer.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the present invention.

FIG. 3 is an enlarged sectional view of a main part of the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part of the present invention.

FIG. 5 is a cross-sectional view of a conventional high voltage electric device.

FIG. 6 is an enlarged cross-sectional view of a main part of a conventional high voltage electric device.

[Explanation of symbols]

 1, 2 ... Tank 3 ... Lead-out part 5 ... Oil duct 7 ... Lead 9 ... Iron core 10 ... Winding 11 ... Penetrating current transformer 12 ... Duct separation part

Claims (1)

[Claims] 1. In a high-voltage electric device in which a main body of the device is divided and housed in a plurality of tanks, a duct through which a high-voltage lead connecting between the plurality of tanks penetrates is provided, and a penetration type current transformer is provided in the duct. A high-voltage electric device, which is arranged near an outlet and is provided with an electrostatic shield in a portion facing a lead of a through-type current transformer.