JPH08250347A - Oil-immersed stationary electric equipment - Google Patents

Abstract

PURPOSE: To provide an oil-immersed stationary electric equipment provided with an on-load tap changer, wherein an oil tank and a tap selector can be dismounted, checked, or replaced without removing oil from the oil-immersed stationary electric equipment and dismounting tap leads. CONSTITUTION: An oil-immersed stationary electric equipment is equipped with an on-load tap changer, wherein an oil tank 4 mounted with a diverter switch 3 and an insulating cylinder 6 which houses a tap selector 5 are provided inside a stationary electric equipment tank main body, and a slide contact point 7 connected to a tap selector 5 fixed contact point is provided in the tap selector 5. Furthermore, a contact point which is connected to the stationary electric equipment tap leads is provided to the insulating cylinder 6, and oil in the insulating cylinder 6 and oil inside the stationary electric equipment tank main body are separated from each other, so that the oil tank 3 mounted with the diverter switch 3 and the tap selector 5 can be dismounted or replaced without removing oil from the oil-immersed stationary electric equipment tank main body and the tap leads of the tap selector 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled static electric device such as a voltage regulator or a transformer provided with a load tap switching device.

[0002]

2. Description of the Related Art In general, some oil-filled static electric devices such as voltage regulators and transformers are equipped with a load tap changer. The load tap switching device has a mechanical life switching frequency defined by a standard, and must be replaced when the prescribed number of operations is reached. Also, inspection is required before the regulations are reached.

For example, since the tap selector of the tap changer for load of the oil-filled transformer is installed inside the transformer tank main body, the oil is first drained from the transformer tank main body when performing inspection and replacement. After that, I entered the transformer tank body and removed the tap lead of the transformer that was complicatedly arranged and connected to the tap selector, and further removed the oil tank and tap selector, so the work was enormous. It took a lot of time and effort and was very difficult.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is not to remove oil from an oil-filled static electric device and to remove a tap lead connected to a tap selector. In order to provide an oil-filled static electric device equipped with a load tap changeover device, in which the oil tank and tap selector can be removed and which can be inspected and replaced.

[0005]

In order to achieve the above object, the present invention is an oil-filled static electric device equipped with a load tap changer, and an insulation for accommodating an oil tank having a changeover switch and a tap selector. A cylinder is provided inside the tank body of the static electric device, and a slide contact that can be connected to the tap selector fixed contact is provided to the tap selector, and a contact to which the tap lead of the static electric device is connected to the insulating cylinder. It is characterized in that it is attached and separates the oil in the insulating cylinder from the oil in the main body of the static electric device tank.

[0006]

In the oil-filled static electric equipment configured as described above, the oil tank of the oil-filled static electric equipment and the oil tank to which the switching switch is attached without removing the tap lead of the tap selector and the tap selector are removed. Can be exchanged.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. As shown in the figure, the load tap changer includes a passive operation mechanism 1 that is a drive device, a transmission shaft 2 that transmits power, a changeover switch 3 that opens and closes a load current, and a tap winding of a transformer. And a tap selector 5 to which the line is connected. A switching switch 3 and a tap selector 5 are provided inside the transformer tank body 11.
Is attached. Due to its characteristic, the switching switch 3 is housed in the oil tank 4 and is isolated from the oil 8 in the transformer tank body.

The oil tank 4 accommodating the switching switch 3 and the tap selector 5 are further accommodated in the insulating cylinder 6 and suspended in the transformer tank body 11. That is, the oil tank 4 and the tap selector 5 are located vertically in the insulating cylinder 6, the tap selector 5 is provided with a slide contact 7 that can be connected to the tap selector fixed contact, and the tap lead 12 slides. It is connected to the transformer side of the contact 7. Further, an oil pipe 13 and valves 9 and 10 are provided outside the transformer tank body between the transformer tank body 11 and the insulating cylinder 6. By operating this valve 9, oil in the transformer tank body 8
The oil 8 in the insulating cylinder can be cut off. Balg 10
Is a valve for supplying and discharging the in-cylinder oil 8. As a result, without removing the oil 8 in the transformer tank main body and without removing the transformer tap lead 12, the oil tank 4 and the tap selector 5 can be removed together from the inside of the insulating cylinder 6 and can be easily replaced. You can

As described above, according to this embodiment, the oil tank 4 and the tap selector 5 can be removed without draining the oil in the transformer tank body 11 and without removing the transformer tap lead 12 from the tap selector 5. Can be exchanged. Further, since the oil in the transformer tank main body 11 and the oil in the load tap changer can be isolated by the insulating cylinder 6, when a transformer internal failure occurs, it is easy to identify the failure occurrence point by gas analysis of oil. .

[0010]

As described above, according to the present invention, the oil tank and the tap selector can be removed and replaced without draining the oil in the transformer tank body and without removing the transformer tap lead from the tap selector. it can. Further, since the oil in the transformer tank main body and the oil in the tap changer during load are isolated by the insulating cylinder, the failure inside the transformer can be identified by gas analysis.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

[Explanation of symbols]

1 ... Conduction operation mechanism, 2 ... Transmission shaft, 3 ... Switching switch, 4 ...
Oil tank, 5 ... Tap selector, 6 ... Insulation cylinder, 7 ... Sliding contact, 8 ... Oil, 9, 10 ... Balg, 11 ... Transformer tank body, 12 ... Transformer tap lead, 13 ... Oil piping.

Claims (1)

[Claims] 1. In an oil-filled static electric device equipped with a load tap changer, an oil container having a switching switch attached and an insulating cylinder accommodating a tap selector are provided in the static electric device tank main body, and the tap selection is performed. A slide contact that can be connected to the fixed contact of the tap selector is provided in the container, and a contact to which the tap lead of the static electric device is connected is attached to the insulating cylinder, and the oil in the insulating cylinder and the tank body of the static electric device are attached. Oil-filled static electric equipment characterized by being isolated from oil.