JPH07230925A - Reactor unit - Google Patents

Abstract

PURPOSE:To provide a rector unit capable of reducing the insulation class during operation and using a small brushing on the neutral-point side. CONSTITUTION:A frame housing 1 has a bushing mounting frame housing 9, and the atmosphere in the frame housing 9 is separated from the other part in the frame housing 1. A bushing 12 on the neutral-point side is supported in the frame housing 9, and a neutral-point extracting lead 13 is connected with the bushing 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor device such as an oil-filled shunt reactor, and more particularly to a bushing attachment portion to which a high voltage is applied and a neutral point leading lead is connected during a withstand voltage test. It is about structure.

[0002]

2. Description of the Related Art FIG. 4 is a schematic diagram showing the structure of an oil-filled shunt reactor as a conventional reactor device of this type.
In the figure, 1 is a housing, 2 is an insulating oil as a cooling medium filled in the housing 1, 3 and 4 are windings immersed in the insulating oil 2 and housed in the housing 1, and An iron core, 5 is a line side bushing arranged on the upper part of the housing 1, 6 is a lead for pulling out a neutral point of the winding 3 for drawing a neutral point, and 7 is a part of the upper part of the case 1. The neutral point side bushing is provided and is connected with the neutral point lead-out lead.

A conventional oil-filled shunt reactor is constructed as described above. For example, in a withstand voltage test carried out after it is installed in a substation or the like, the line side bushing 5 and the neutral point side bushing 7 or the tested object are tested. Between the phase bushing,
When a test voltage is applied and a test is performed, the exciting current becomes very large, and the capacitor or test equipment that compensates for this becomes very large and difficult to carry out. Therefore, the line side bushing 3 and neutral A method of applying the same voltage to the point side bushing 7 to perform the test is adopted.

[0004]

Since the conventional oil-filled shunt reactor is constructed as described above and the withstand voltage test is conducted by the above-mentioned method, for example, in a 275 kV shunt reactor, Since the neutral point is used for direct grounding, insulation of AC 70 kV (1 minute) is acceptable in the standard, but the withstand voltage value on the line side bushing 5 side is AC18.
Since 4 kV (10 minutes) is required, this voltage is also applied to the neutral point side for the reason described above. Therefore, the winding 3, the neutral point lead-out 6 and the neutral point side bushing 7 are provided.
Since it is necessary to provide sufficient insulation to withstand this voltage, not only the neutral point side bushing 7 becomes long and the installation space becomes large, but also the earthquake resistance is weakened.

Therefore, if the neutral point side bushing 7 is to be replaced with a short one having a low insulation class after the test, the portion where the neutral point side bushing 7 is arranged is opened. Since it is necessary to process a large amount of insulating oil 2, there is a problem that replacement work is troublesome. Furthermore, when conducting a test with the current transformer attached to the neutral point lead 6, There was a problem that a very large current transformer with a high insulation class had to be installed.

The present invention has been made to solve the above-mentioned problems, and it is possible to replace the neutral point side bushing with a short one having a low insulation class after the test with a short replacement work time. Another object of the present invention is to provide a reactor device capable of measuring the current of the lead for neutral point extraction with a small current transformer having a low insulation class.

[0007]

According to a first aspect of the present invention, there is provided a reactor device in which a winding and an iron core house a part of a casing in which a bushing to which a lead for pulling out a neutral point is arranged. The bushing attachment housing is formed separately from the portion to be mounted.

According to a second aspect of the present invention, there is provided a reactor device in which the neutral point lead-out lead according to the first aspect is divided into a plurality of parts and the partition parts are penetrated to lead out into the bushing mounting chamber. The current transformer is detachably arranged.

[0009]

According to the first aspect of the present invention, in the bushing mounting housing of the reactor device, the inside of the housing that supports the bushing and accommodates the winding and the iron core is separated from the insulating oil filling atmosphere to provide separate atmospheres. The lead for pulling out the neutral point is introduced into the interior through the partition and connected to the bushing.

In addition, the split lead for neutral point extraction according to claim 2 of the present invention enables attachment and detachment of a small-sized current transformer.

[0011]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a schematic diagram showing the configuration of an oil-filled shunt reactor according to a first embodiment of the present invention. In the figure, the insulating oil 2, the winding 3, the iron core 4, and the line side bushing 5 are the same as those of the conventional device shown in FIG. Reference numeral 8 denotes a casing in which the winding 3 and the iron core 4 are housed inside filled with insulating oil 2, and the line side bushing 5 is attached to the upper portion. Housing 8 via spacer 10
And a bushing mounting housing in which the internal atmosphere is divided.

Reference numeral 11 denotes insulating oil filled in the bushing mounting housing 9, reference numeral 12 denotes a neutral point side bushing having a low insulation class and a small size fixedly supported on the upper portion of the bushing mounting housing 9, and 13 is divided into a plurality of parts. The neutral point lead-out lead 14 that is penetrated through the oil-immersed spacer 10 and is introduced into the bushing attachment housing 9 to be connected to the neutral point-side bushing 12, 14 is respectively attached to each of the neutral point lead-out leads 13. It is a plurality of current transformers that are detachably attached.

In the oil-filled shunt reactor according to the first embodiment having the above-described structure, for example, in the case of a 275 kV reactor, the neutral point is directly grounded during operation, and the AC is used.
As long as the insulation is equivalent to No. 30, which can withstand 70 kV (1 minute), the neutral point side bushing 12 can be a short one. Then, each of the divided leads 1 for pulling out the neutral point
The current flowing through 3 is detected by each current transformer 14.

On the other hand, in the withstanding voltage test, AC184 kV
Since the voltage of 10 minutes is applied, the neutral point side bushing 12 lacks the dielectric strength as described above. Therefore, as shown in FIG. It is necessary to replace with the neutral point side bushing 7 having insulation. In this case, first open the bushing mounting housing 9 and temporarily remove each current transformer,
Take it out of the bushing attachment housing 9. After that, the neutral point side bushing 12 is removed and replaced with the neutral point side bushing 7, the insulating oil 11 in the bushing mounting case 9 is treated, and the bushing mounting case 9 is sealed and tested.

As described above, according to the first embodiment, the housing 1
A bushing mounting case 9 whose interior atmosphere is partitioned from the inside of the case 1 is provided in a part of the neutral point side bushing 12 to which the neutral point lead-out lead 13 is connected. Since it is configured to support the insulating oil 11 in the bushing mounting housing 9, it is possible to process only the insulating oil 11 in the bushing mounting housing 9 even if it is replaced with one having a higher insulation class during the withstanding voltage test. Since the replacement work can be performed, no problem occurs even if the neutral class side bushing 12 having a low insulation class and a small insulation class is used during normal operation, and installation space, seismic resistance, etc. are solved.

Further, since the lead 13 for pulling out the neutral point is divided into a plurality of parts at a portion which penetrates the spacer 10 in oil for partitioning the housing 8 and the bushing mounting housing 11, the plurality of current transformers 14 are divided. Since the current transformer 14 can be used, and the current transformer 14 is detachable, if the neutral point side bushing 12 is replaced, the current transformer 14 can be removed and a withstand voltage test can be performed. Can be used.

Example 2. In the first embodiment described above, the small current transformer 14 can be used by dividing into a plurality of neutral point lead-out leads 13 at the portion penetrating the in-oil spacer 10, but the neutral point lead-out lead can be used. This is not necessary in a device that does not use an AC device on the side, and for example, as shown in FIG. 3, the neutral point extraction leads 6 that are collectively put together as in the conventional device are passed through the spacer 10 in oil. Even if it is applied to the bushing mounting case 9 and is connected to the neutral point side bushing 12, the insulation class is high in the withstand voltage test as in the case of the first embodiment. Even if it is replaced, only the insulating oil 11 in the bushing mounting housing 9 can be processed, and the bushing replacement work can be performed in a short time. Low and short neutral point side Thing 12
There is no problem even if you use, and the problem of installation space and earthquake resistance is solved.

Example 3. Further, in each of the above-described embodiments, the case where the insulating oils 2 and 11 are used as the cooling medium filled in the both housings 1 and 9 has been described, but the present invention is not limited to this and, for example, hexafluoride. It goes without saying that the same effects as those of the above-mentioned respective embodiments can be obtained even when applied to the one in which sulfur (SF ₆ ) gas or the like is enclosed.

[0019]

As described above, according to the first aspect of the present invention, the winding and the iron core are housed inside the housing filled with the cooling medium, and the neutral point lead is connected to a part of the housing. In the reactor device in which the bushing is installed, the bushing mounting housing is formed by partitioning a part of the housing in which the bushing is installed from the part in which the winding and the iron core are stored. It is possible to provide a reactor device having a low and short neutral point side bushing that can be used.

According to a second aspect of the present invention, the neutral point lead-out lead according to the first aspect is divided into a plurality of parts, and the partition parts are penetrated to lead out into the bushing mounting housing.
Since the current transformer is detachably attached to this lead-out part, it is of course possible to use a short neutral bushing with a low insulation class at the time of operation, as well as the current for the neutral point lead. It is possible to provide a reactor device capable of downsizing a current transformer for detection.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of an oil-filled shunt reactor according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of an oil-filled shunt reactor in FIG. 1 during a withstand voltage test.

FIG. 3 is a schematic diagram showing a configuration of an oil-filled shunt reactor according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram showing a configuration of a conventional oil-filled shunt reactor.

[Explanation of symbols]

 1, 8 Case 2, 11 Insulating oil (cooling medium) 3 Winding 4 Iron core 5 Line side bushing 6, 13 Neutral point lead-out lead 7, 12 Neutral point side bushing 9 Bushing mounting case 10 Oil spacer ( Compartment) 14 Current transformer

Claims (2)

[Claims] 1. A reactor device in which a winding and an iron core are housed inside a housing filled with a cooling medium, and a bushing to which a lead for extracting a neutral point is connected is provided in a part of the housing, A reactor device, characterized in that a bushing mounting case is formed by partitioning a part of a case in which the bushing is arranged from a part in which the winding and the iron core are housed. 2. The neutral point lead-out lead is divided into a plurality of parts, penetrates the partition part and is led out into the bushing mounting housing, and a current transformer is detachably arranged at this lead-out part. The reactor device according to claim 1.