JPS6213301Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a protective frame for a switch for underground power distribution.

Particularly in urban areas, power distribution lines are underground due to aesthetic concerns, but since there is not enough space for manholes, switches are installed in the limited space. I had to. Therefore, when workers enter the manhole during construction or inspection, they use the upper surface of the switch case and the parts protruding from the upper surface, such as bushings and cables, as footholds to apply undesigned loads to them. This has caused problems such as damaging the airtightness between the case and the bushing, adversely affecting the contact status of the internal opening/closing part, and even interfering with the conduction of electricity to the electrode parts of the connector.

Particularly in the case of underground power distribution, there is a risk of flooding, so maintaining airtightness is a major performance issue.

The object of the present invention is to provide a protective frame structure for an underground power distribution switch that solves all of the problems existing in the prior art.

An embodiment embodying the present invention will be described below with reference to the drawings. In the drawings, M is a manhole, E is a path to the ground, and L is a power distribution path provided from the manhole M to both sides.

1 shows the entire underground power distribution switch installed at the center of the bottom of the manhole M, and in this embodiment, a gas switch is used. Reference numeral 2 denotes a main body case forming the lower part of the switch 1, and on one side of the upper surface there is an upper case part 3 that covers the opening/closing mechanism further upward.
are integrally formed.

Reference numeral 4 denotes a main line bushing part provided in parallel for three phases on the upper surface of the right side of the main body case 2, which includes a bushing 5 that passes through the main body case 2 as shown in FIG. , the connection unit 7, and the elbow connector 8
The blind covers 9 and 10 are connected and fixed in sequence. Note that the elbow connectors 6 and 8 are the same part and are connected to the power distribution cables 11 extending in opposite directions, and the connection unit 7 is used to electrically connect both the elbow connectors 6 and 8. belongs to. Further, a gas-filled opening/closing mechanism section (not shown) is provided at the inner end of the bushing 5.

Reference numeral 12 denotes a branch bushing part provided on the upper surface of the main body case 2 for two systems for each phase in line with the main bushing part 4, and is connected to a bushing 13 passing through the inside and outside of the main body case 2 as shown in FIG. 5b. It is connected to an elbow connector 14. In addition, a drop-in line or branch distribution line 15 to each customer is connected to the elbow connector 14, and the opening/closing mechanism section is connected to the inner end of the bushing 13, so that when the circuit is closed, the branch side is connected to the main line side, and when the circuit is opened, it is disconnected. Ru.

Reference numeral 16 denotes two long legs 17, two short legs 18, and a square frame-shaped frame 1 supported by each of the legs 17 and 18.
9, each part is constructed by combining angle materials, and the lower ends of short legs 18 projecting downward from both rear corners of the frame body 19 are bolted to the front surface of the upper case part. At the same time, the lower ends of long legs 17 projecting downward at both front corners of the frame 19 are bolted to the upper front surface of the main body case 2.

Reference numeral 20 indicates a scaffold board fixed to the frame 19, and 21 indicates a pipe-shaped ladder fixing part fixed to the upper surface of both sides of the front part of the scaffold board 20. The lower end can be fixed.

To install the switch as described above, a worker enters the manhole M in advance and fixes only the switch 1 at the bottom, then lowers the bridge groove 16 from the passage and attaches the lower ends of both long and short legs 17 and 18 to the main body case. 2 and upper case part 3 by bolts, respectively. After that, the ladder 22 may be fixed by the fixing part 21.

In this way, the present invention provides the frame 16 and a scaffold to protect the bushing part that protrudes from the top surface of the switch 1, so that when the worker goes down into the manhole M, he or she can directly put his or her feet on the bushing part. This has the great effect of reliably avoiding adverse effects on the airtightness inside and outside of the main body case and on the electrical conductivity of opening/closing parts, connectors, etc.

Furthermore, since the frame 16 and the switch 1 can be separated and the frame 16 can be assembled after the switch 1 is installed, the switch 1 can be installed and connections with each cable and other adjustment work can be performed without the interference of the frame 16. Not only can this be done, but there is no extra weight and unnecessary protruding parts when installing the switch 1, making it easier to lower and install the switch 1 into the manhole M.

Incidentally, if the ladder fixing part 21 is provided on the scaffold board 20 as in the embodiment described above, the installation of the ladder 22 can be simplified.

As described in detail above, the present invention is to fix a structure that protects the main body case and most of the upper part of the bushings and cable connectors led out from the main case in a separable manner to the main body case, and to provide a scaffold on the structure. By installing a fixing part on the scaffold to fix the lower end of the ladder, workers will not have to put their feet on the bushing part, etc., which will adversely affect the energization status of the opening/closing part and the contact part of the connector. There is nothing to do. Furthermore, since the scaffolding is provided with a ladder fixing part, the ladder can be easily installed.

Additionally, since the frame and the switch can be separated and the frame can be assembled after the switch is installed, it is possible to install the switch, connect each cable, and perform other adjustments without getting in the way of the frame. Not, but
This has the excellent effect of making it easier to lower and install the switch into a manhole without unnecessary weight and unnecessary protruding parts when installing the switch.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the installed state of the present invention, Fig. 2 is a side view, Fig. 3 is a plan view, Fig. 4 is a perspective view, and Figs. FIG. Switch 1, main case 2, upper case part 3, main bushing part 4, branch bushing part 12, frame 16, long leg 17, short leg 18, frame 19, scaffold board 2
0, ladder fixing part 21, ladder 22.

Claims (1)

[Scope of utility model registration request] A frame 16 that protects the upper part of the main body case 2 and the bushings 4, 12, cable connectors 6, 8, etc. led out from the main body case 2 is separably fixed to the main body case 2, and a scaffold 20 is mounted on the frame 2. A protective frame structure for an underground power distribution switch, characterized in that a scaffolding 20 is provided with a fixing part 21 for fixing the lower end of a ladder 22.