JP2513663Y2 - Neutral point grounding device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a neutral point grounding device for obtaining a neutral point grounding connection point of a circuit.

[0002]

2. Description of the Related Art As is well known, a neutral point grounding device includes a grounding transformer 1 and a grounding transformer 1 as shown in the circuit diagram of FIG.
The neutral point reactor 2 and the series resistor 3 which ground the neutral point. In the grounding transformer 1, the primary is connected to the star and the secondary is connected to the delta. 4 is a disconnector
Reference numeral 5 denotes a grounding switch, which is used when necessary, for example, for inspection, and may not be installed.

These grounding transformer 1 and neutral point reactor 2
And the series resistor 3 is housed in one tank 6 as shown in FIG. 1 so as to reduce the installation space, and the system configuration is changed. In order to facilitate workability when the neutral point reactor 2 is exchanged with one having a capacity corresponding to the change, a work hole 7 is provided in the lid 6A of the tank 6, and a lid for closing the work hole 7 is provided. The structure in which the neutral point reactor 2 is suspended on the suspension 8 via the suspending metal 9 and the neutral point reactor 2 is suspended together with the lid 8 has been separately proposed by the inventor (Japanese Utility Model Publication No. 7-51783). three
Teru. ) .

In FIG. 1, the series resistor 3 is omitted, and instead of this, a resistor winding is used as the reactor winding 10 constituting the neutral point reactor 2, so that it also serves as a resistor. The configuration is shown. The neutral-point reactor 2 is housed in a case 11 which also serves as a shield and is made of aluminum or the like, and is installed above the ground transformer 1 or on the side thereof.

By the way, in the neutral point grounding device having such a structure, when the lid 8 is opened to replace the neutral point reactor 2, other devices other than the neutral point reactor 2 are exposed to the outside air. There is a risk that the insulation of these devices will absorb moisture and deteriorate in quality.

[0006]

[Problems to be Solved by the Invention] The present invention stores a grounding transformer, a neutral point reactor, and a series resistor in one tank, and also allows the neutral point reactor to be freely taken out from a working hole of the tank. In the point grounding device,
The purpose is to minimize the deterioration of the quality of other equipment in the tank when the neutral point reactor is taken out.

[0007]

The present invention is characterized in that a neutral point reactor is airtightly divided by a partition wall.

[0008]

Function: The work hole is normally closed by the lid. In this closed state, the neutral point reactor is hung on the lid via the hanging metal fitting. When the neutral point reactor is taken out, the lid is opened and the neutral point reactor is hoisted upward, and the neutral point reactor is hoisted together with the lid and taken out of the tank. Even when the lid is opened, the neutral point reactor is airtightly partitioned by the partition wall, so that other equipment is prevented from absorbing external moisture. This makes it possible to minimize deterioration of the quality of the device due to moisture absorption.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In the figure, 12 is a winding constituting the grounding transformer 1, and 13 is an iron core around which the winding 12 is wound. The working hole 7 is closed by attaching the lid 8 so as to be openable and closable using bolts or the like. The working hole 7 has a size that allows the case 11 to pass through. The hanging metal fitting 9 attached to the lid 8 penetrates the case 11, and the lower end thereof is attached to the bottom wall of the case 11. Reference numeral 14 is a hanging fitting used when the lid 8 is lifted.

When the neutral point reactor 2 is to be changed due to the change of the system configuration, the lid 8 is removed from the upper lid 6A, and the lid 8 is lifted upward by using the hanging metal fitting 14. By this hoisting, the neutral point reactor 2 is integrally united with the case 11 via the hanging metal fitting 9 and is hung upward through the working hole 7 as it is.

A neutral point reactor to be exchanged is manufactured separately, and the neutral point reactor is exchanged with the hanging neutral point reactor and fixed to the case 11, and the lid 8 is operated by the reverse operation. Is suspended and the working hole 7 is closed and fixed.

According to the present invention , the partition wall 1 is provided inside the tank 6.
It is airtightly divided by 5. And inside the partitioned area
Place the Sex Reactor 2 . The lead wire from the neutral point reactor 2 is led to the outside through the insulating space 16 provided in the partition wall 15.

In such a structure, when the lid 8 is opened to replace the neutral point reactor 2, the partition wall 15 prevents outside air from entering the inside of the tank 6 from the outside thereof. As a result, the grounding transformer 1 and other tanks 6
It is prevented that the insulators of the equipment housed in the room absorb the moisture contained in the outside air. Therefore, it becomes possible to prevent the deterioration of quality due to the deterioration of insulation.

The tank 6 may be filled with an insulating gas as an insulating medium. In that case, the tank 6 is evacuated. If such evacuation is performed inside the tank 6 and the interior partitioned by the partition wall 15 at the same time, it is not necessary for the partition wall 15 to have a structure capable of withstanding the evacuation. Both chambers may be treated as the same gas section during operation, and if both chambers are connected outside the tank 6, only one gas monitoring device is required.

[0015]

As described above in detail, according to the present invention, the grounding transformer, the neutral point reactor and the series resistor are housed in one tank, and the working hole in which the neutral point reactor is provided in the tank is formed. In the configuration in which the replacement is performed via the above, the effect of the outside air at the time of the replacement can be localized, the deterioration of the quality can be avoided, and the deterioration of the reliability can be minimized.

[Brief description of drawings]

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

FIG. 2 is a circuit diagram of a neutral point grounding device.

[Explanation of symbols]

 1 Grounding Transformer 2 Neutral Point Reactor 3 Series Resistor 6 Tank 7 Working Hole 8 Lid 9 Hanging Bracket 11 Case 15 Partition Wall

Claims (1)

(57) [Scope of utility model registration request] 1. A grounding transformer, a neutral point reactor for grounding a neutral point of the grounding transformer, and a series resistor,
The grounding transformer, the neutral point reactor and the series resistor are housed in one tank, and a working hole for drawing out the neutral point reactor to the outside of the tank is provided in the tank to close the working hole. With a lid that can be opened and closed,
In a neutral point grounding device in which the neutral point reactor is suspended via a suspending metal , a partition wall is provided inside the tank.
Use the hanging metal fittings to
Place the neutral point reactor that is suspended by
A neutral grounding device.