JPS6331409A - Entrance cable supporter of switchboard - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a three-phase, three-core load cable that is connected to a high voltage distribution panel.
The present invention relates to a pull support device.

[Prior art and its problems]

Generally, in the lead-in cable of a high-voltage switchboard, one or several three-phase three-core cables pass through a zero-phase current detection current transformer (hereinafter referred to as ZCT), are led in from the bottom of the back of the panel, and are terminal-treated. Although each phase is connected to a conductor bar connected to the circuit breaker connection bushing, the advantage of the drop-in cable is that its processing space is as short as possible, and it can be easily and securely fixed.

As shown in FIGS. 5 and 6, in the conventional lead-in cable, the lead-in cable 1 penetrates ZCT 2% and is drawn in.
After terminal treatment, the cable is fixed to the panel frame with a cable bracket 3, and is connected by a terminal 5 to a conductor hook 4 connected to a circuit breaker connection bushing (not shown). 6 is a support insulator for the conductor 4. In the terminal treatment, in order to secure the creepage insulation distance between the terminal 5 and the cable bracket 3, the insulation thickness is gradually reduced over a certain length Ll, and an insulating tape is wrapped around the base end of the three-core branch to form the bulge 1a. It is stipulated that a Furthermore, a distance L2 must be provided between the ZCT 2 and the cable bracket 3 in order to bend the cable.

With this structure, the processing length of the lead-in cable is reduced, and +L
2, and as a result, the connection position to conductor no. 4 must be placed high, making the cable and conductor bar long. Also, since a cable bracket is provided for each three-core cable, fixing work is time-consuming and expensive. There were some drawbacks.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks, and to provide a support device for a lead-in cable that has a simple structure, requires a short cable processing space, and can perform cable fixing work in a short time.

[Key points of the invention]

The present invention aims to embed an insert metal fitting in the molded resin of ZCT through which a three-core lead-in cable passes through, and to sandwich the lead-in cable through a cushioning material with a two-part support metal fitting fixed to the insert metal fitting. .

[Embodiments of the invention]

1 and 2 show a lead-in cable support device according to an embodiment of the present invention, and parts indicated by the same reference numerals as in FIGS. 5 and 6 are the same parts. The lead-in cable 1 that has passed through the ZCT 2 is fixed to the ZCT 2 (with the supporting hardware 7
Entirely supported by.

After terminal treatment, the conductor bar 4 is connected to a conductor bar 4 supported by an insulator 6 via a terminal 5.

Figures 3 and 4 show details of the support for the drop-in cable. An insert metal fitting 8 is embedded in the straight resin of ZCT2, and a two-part support metal fitting 7 is embedded in this insert metal fitting 8.
are fixed by bolts 9 through elongated holes 71, and the cushioning material 1
The lead-in cable 1 is held between the cables 0 and 0.

By providing the long holes 71 for attachment in the support hardware 7, the same support hardware can be used even if the cable size changes.

By simply pushing the support hardware 7 by hand and fixing it with the bolts 9, the bulge 1a of the lead-in cable is engaged, and the lead-in cable 1 is inserted through the support hardware 7 into the 7. It comes to be supported by Cr2.

〔Effect of the invention〕

According to the present invention, the three-core lead-in cable of the switchboard is connected to the Z
It is supported and fixed to the CT, eliminating the need for a cable bracket, and the cable processing space is shortened, so the length of the connecting conductor bar is also shortened, and when assembled in a row of panels, the cable processing section and the connecting conductor section are aligned with the panel without ZCT. This has the effect of reducing costs because parts can be unified and fixing work can be made easier.

[Brief explanation of the drawing]

Fig. 1 is a front view of a lead-in cable of a switchboard having a support device according to an embodiment of the present invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a detailed view of section P in Fig. 1, and Fig. 4 is a FIG. 3 is a plan view taken along the line IV-IV in FIG. 3, FIG. 5 is a front view of a lead-in cable of a switchboard having a conventional support device, and FIG. 6 is a side view of FIG. 1: Lead-in cable, 2: ZCT, 4: Conductor bar, 5
: Terminal, 6: Insulator, 7: Support hardware, 8: Insert hardware, 9: Bolt, 10: Cushioning material. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1) The three-phase three-core load cable of the switchboard, which passes through the zero-phase current detection current transformer, is fixed to the insert metal fitting buried in the molded resin of the current transformer.The two-part support metal fitting is used as a buffer material. A lead-in cable support device for a power distribution board, characterized in that the cable is clamped through the cable.