JPS6037703A - Oil-filled electric apparatus - Google Patents

Abstract

PURPOSE:To simplify operation of drawing a vacuum and of oiling as well as to reduce area required for installation, by equalizing the level of the tand top to that of the lower end of the partition member and by communicating a pocket with a cable connection box. CONSTITUTION:A tank body 12 is connected with a container 13 which has a partition 16 defined by a partition member 15 made of fibrous molded piece, and a pocket 13a is provided within the container 13. Further, the lower end of the partition member 15 is put on the same plane with the upper side of the tank 12. A connection tube 23 is provided between the pocket 13a and a cable connection box 23 to sealably communicate them.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an oil-filled electrical appliance, and particularly relates to an improvement of a partition portion disposed between an oil-filled electrical appliance body and a cable connection box.

[Technical background of the invention and its problems]

When an oil-filled R% such as a transformer or reactor is installed in an underground substation or building, its line terminals are often directly connected to cables. Structure of cable connection part of conventional oil-filled electrical equipment 1.1 As shown in Figure 1, the line end lead (2) pulled out from the contents (11) consisting of an iron core and coil is connected to the main body tank (3). Sanru cable connection box (5)
The cable (7a) is connected through the oil-submerged bushing (6) which is installed through the cable (7a) and is pulled out to the outside by the cable (7). In addition, the conservators (8) and (8a) are fully connected to the upper side of the main tank (3) and the cable junction box (5), respectively, and the main tank (3), cable junction box (5), and conservator are fully connected. beta(
8).

(8a) is filled with insulating oil (4). When a bushing is used as a partition between the main body of a cable-directly connected oil-filled electrical appliance and the cable junction box, for example,
In the 0 kV class, the length of the fencing is over 4 m, which is a constraint on downsizing the substation.

Therefore, instead of bushings, for example, synthetic resin molded parts such as epoxy resin or press pods are used for oil-filled electrical equipment installed in substations under the control where reduction in diameter is most required, as shown in Figure 2. A partition member (9a) made of a fibrous molded member? The provided partition section (9) is being adopted.

The length of such a partition (9) can be reduced to a fraction of that of the bushing (6). Furthermore, compared to synthetic resin molded members such as epoxy resin, fibrous molded members such as presspods are easier to manufacture and are less expensive, and can provide the same size reduction and insulation reliability.

On the other hand, when installing such an oil-filled electrical appliance, first, after assembling and connecting the main body, it is immediately evacuated and insulating oil is injected. This removes moisture absorption or residual gas from the insulating members inside the main body, thereby improving insulation reliability. After that, according to the cable installation, connect the cable head (7a) with the connecting wire (5a) inside the cable junction box (5). It is connected to the cable (7) through it, and vacuuming and lubrication work is performed in the same way as on the main body side.

Therefore, according to the conventional configuration shown in FIG.
In 9), the main body tank (3) side and the cable junction box (5) side, which are separated by the partition member (9a), are vacuumed and lubricated individually, so the partition member (9a) of the partition part (9) A pressure difference is created before and after. Especially when vacuuming or lubricating the cable junction box (5) side, be sure to
Since the oil column pressure corresponding to the height of the conservator (8) is further applied to the 3) side, a pressure of approximately 1.5 g/cA is applied to the partition member (9a). In order to withstand such high pressure for a long time and eliminate oil leakage, the partition part (9) using a partition member (9a) such as a presspod has to increase in size and cost. It also becomes a constraint for downsizing.

In order to solve these problems, the main unit and cable junction box (5
) It is possible to do internal assembly work, vacuuming, and oiling at the same time, but cable installation work must be done at the same time as other equipment in the entire substation is completed, and oil-filled equipment requires long-term assembly work. It was difficult to adapt the assembly schedule to these requirements.

It is also possible to remove the insulating oil (4) from the main body tank (3) side and relubricate it when the cable junction box (5) side is completed, but the amount of oil on the cable junction box (5) side is Compared to this, the amount of oil on the main body tank (3) side is, for example, 300MVA class, which is about 100kA, so it is necessary to secure a large space for the oil storage tank for a long period of time. However, there were also problems that needed to be resolved, such as reducing the size of the substation and securing space for installing other equipment.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and its purpose is to connect the main body and the cable junction box by the partition portion formed by the partition member made of a fibrous material. To provide an oil-filled electrical appliance that facilitates vacuuming and oiling operations and can significantly reduce the installation space.

[Summary of the invention]

In order to achieve such an object, the present invention provides a partition between the main tank and the cable connection box, and the partition is connected to the main tank to partition the container with a partition member made of an R fiber molded member. At the same time, a pocket portion is formed inside this container, and the lower end of the partition member is formed to be at least approximately flush with the upper surface of the main tank, and the pocket portion of the partition portion and the cable connection box are formed at the same level. By providing a connecting pipe that can be sealed and communicated between the main body tank and the cable junction box through the partition, it is easier to vacuum and lubricate, and the installation space can be significantly reduced. Its characteristic is measurement.

[Embodiments of the invention]

An embodiment of the oil-filled electrical appliance of the present invention will be described below with reference to the drawings. In Figure 3, a coil (ll) is attached to an iron core (lla).
b), and store it inside the oil-filled electrical equipment tank 02 (hereinafter referred to as the main tank). This main tank (
Attach a container (13) ft having a pocket portion (13a) so as to rise from the upper cover (12a) of 121,
A partition part ae is formed by attaching a partition member (L) made of a fibrous molded member such as presspod to the 0 fathom end of this container so as to cover it.

Then, the line end lead (17) of the winding (llb) passes through the inside of the container (131) of the container 00 of the partition part OQ, that is, the pocket part (13a), and is attached to the partition member (passing through approximately the center of the partition part OQ. Partition (cable connection section α in 1Q)
Cable C71 with barrel all connected and cable head (2G) through line end lead (I7) and cable connection lineman
).

The lower end (15a) of the partition member α9 of the partition Oe is positioned at the same level as or above the upper cover (12a) of the main body tank α force, that is, so that it is at least approximately flush with the upper cover (12a). Form. In addition, the partition part (10
The pocket part (13a) and the cable connection box Qllll are connected so as to communicate through the connection pipe 12th floor having valves (221, (22a)). The conservator (,!!i) and (25a) are respectively the valve@
The main tank (I2.
Cable junction box marked 0 and conservator (c), (25
a) The inside is filled with insulating oil (c) to form an oil-filled electrical appliance.

Next, the effects of the embodiment of the present invention configured to allow assembly in this manner will be described.

A coil (11b) is attached to the iron core (lla) inside the main tank u.
) and store it, airtightly seal it with a blind lid (shown from the outside of the partition member 151) provided in the partition part θQ, and after fully evacuating the main body tank α′lJ, insulating oil −
Lubricate the tank (121) and remove the upper cover (12a) of the main body tank (121).
) Lubricate and park at the level trench.

In this state, the lower end (15) of the partition member (15)
Since the section a) is provided at the same level as the cover (12a) or located above the cover, no insulating oil is contained in the pocket section (13a) of the partition section (I6).

Next, remove the blind cover (not shown) and connect the cable junction box (LI-) to the partition part 06). Then, connect the partition member 95
1, the line end lead θ force on the main body side is connected to the cable connection line (19), and connected to the cable (21) having the cable head (2t) via this cable connection line 0. Also, the pocket part (13a ) and cable junction box (1
8) and a connecting pipe (c) having gold valves (22) and (22a).

In this state, open the valve (A) of the connecting pipe (C), close the valve (22a), and close the pocket part (13a).
By evacuating and lubricating the cable connection phase opening and the cable connection phase opening simultaneously, the partition member (15) can be filled with the insulating oil (c) without creating any particular pressure difference.

Furthermore, both conservators 25) and (25a) are also filled with insulating oil to complete the assembly and installation.

In this way, without putting insulating oil in the pocket part (13a), you can connect the cable junction box u barrel and simultaneously evacuate and lubricate both communicating parts.
Partitioning member (19)
Since the function of dividing by two does not require particular requirements such as being oil-tight or able to withstand pressure differences, the cost is low. Furthermore, since there is no need for a large oil storage tank for draining and storing a large amount of insulating oil on the main body side, and a location for installing this tank, there is no restriction on downsizing. Additionally, cable connection phase opening can be done according to the schedule of cable installation.
Moreover, there are advantages such as connection work can be completed in a short period of time.

〔Effect of the invention〕

As explained above, according to the embodiment of the present invention, in the partition portion formed by partitioning with an inexpensive partition member made of a fibrous molded member, the lower end of the partition member is at least at the level of the upper part of the main tank. The main body tank and the cable junction box are all connected through this partition, and the pocket part and the cable junction box communicate with each other.
94ζ, the partition member can be manufactured at low cost without creating a pressure difference in the partition member during vacuum evacuation and lubrication operations. In addition, it is possible to provide an oil-filled electrical appliance that can connect the cable junction box without changing the timing of connection, and that can be significantly downsized because it does not require a particularly large oil storage tank or installation location. can.

[Brief explanation of drawings]

1 and 2 are cross-sectional configuration diagrams of a conventional oil-filled electric appliance with eaves, and FIG. 3 is a cross-sectional configuration diagram of an oil-filled electric appliance according to the present invention. (11,a)...Iron core, (jlb)...Coil,
(17J...Main tank. (12a)...Cover, container, (13a)
・−・Pocket part. (15)...Partition member, (15a)...Lower end,
(16)...Partition section. 07)...Line end lead, 081...Cable connection box. 0→...Cable connection line, Cause...Cable head. (21)...Cable, 122), (22a)...
・Valve, (23+...connecting pipe. (25), (25a) ・-D servator, (28)
...Insulating oil. Agent Patent Attorney Mr. Inoue Figure 1 Figure 1@2 Figure 3

Claims (1)

[Claims] In an oil-filled appliance having a partition between a main tank and a cable connection box, the partition partitions a container connected to the main tank with a partition member made of a fibrous molded member, and also has a pocket inside the container. the lower end of the partition member is formed to be at least substantially flush with the upper surface of the main body tank, and a seal is formed between the pocket portion of the partition portion and the cable connection box. An oil-filled electrical appliance characterized by having a connecting pipe that freely communicates with each other.