JPS61191203A - Closed power board - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a closed switchboard provided with a disconnect bushing.

[Background of the invention]

As shown in FIG. 4 of the conventional example, the closed switchboard has a main circuit configuration as shown in FIG. It is connected to an external cable or load via a zero-phase current transformer, etc.

Depending on their purpose, the disconnecting section separates the main circuit from the circuit breaker and separates it from the circuit breaker room. The zero-phase current transformer 9 should be grounded or otherwise protected by zero-phase current detection.
It is customary to have independent functions and to divide the work.

In recent years, it has become necessary to make circuit breakers smaller and more compact due to the use of vacuum circuit breakers and reductions in construction costs. Similarly, disconnection type transformers in which a disconnection bushing and a current transformer are integrally molded have also been used.
.

However, these are separate phases and must be connected as a three-phase unit like a zero-phase current transformer.
Generally, as shown in FIG. 4, it is provided at the lower part of the cable head, that is, at the external cable section.

In this case, the inner diameter of the zero-phase current transformer was not determined until the cable specifications were determined, and the design and manufacture of the switchboard had to be delayed, resulting in unreasonable construction and space considerations.

Also, if it is necessary to connect multiple cables 10,
The inner diameter of the zero-phase current transformer 9 became so large that it sometimes became impossible to store it in the panel. Furthermore, when checking the voltage, there is an increasing number of cases in which a voltage detector using a supporting insulator type is installed and a voltage detector is connected to check the presence or absence of voltage.

These components were arranged and connected independently inside the switchboard, making the internal configuration of the switchboard complex. In addition, it is necessary to connect secondary wiring from these devices to a door or monitoring panel, etc., so it is necessary to separate the control circuit inside the panel and conduct the wiring 11 separately, which requires a large amount of work and is difficult to inspect. Another problem was that there were limits to the size of the board.

[Purpose of the invention]

The purpose of the present invention is to create a compact and safe power distribution board by concentrating and arranging equipment in the molded part of the disconnection section! !・.

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) [Summary of the Invention] The present invention arranges a contact part with a circuit breaker and a voltage detection part in a three-phase integrated mold of a disconnecting part, and once contracts the three phases in the mold and arranges a zero-phase current transformer. After that, the three phases are expanded again, a current transformer is molded into each phase, and each device is integrated with the disconnect bushing to make it more compact.

[Embodiments of the invention]

Embodiments of the closed switchboard according to the present invention will be described below based on the drawings.

In FIG. 3, an uninvented treadle-shaped transformer 12 is provided at the same position as the disconnector bushing 5. This disconnection section type transformer 12 is shown in detail in FIGS. 1 and 2.

In FIGS. 1 and 2, the main conductor 14 is a contact that makes sliding contact with the contact of the circuit breaker 4 and is connected to the bushing 15 to the circuit breaker chamber.
It becomes. A U-shaped conductor 16 is fixed to this main contact, and the end portion is also fixed to a load-side conductor 17. Therefore, the second phase and the third phase are arranged symmetrically with respect to each other, and the second phase is straight. These parts are integrally molded into three phases using a resin mold 20 such as epoxy.

According to this 2 conductors 14 to 19, a zero-phase current transformer 2 is installed in the U-shaped part 16.
1 is arranged to pass through the three phases, and then a current transformer 22 is placed in each phase.

Furthermore, one or more voltage detectors '23 are placed at the end of each phase. Secondary wiring for these devices 21, 22, 23, etc. (not shown) is connected to terminals 24, etc. via the inside of the mold, and wired to the outside of the panel.

This three-phase integrated disconnecting section type transformer 12 is connected to the closed switchboard main body 1
It is attached to the closing barrier 25.

With this configuration, the current transformers, zero-phase current transformers, voltage detectors, etc. placed in the closed switchboard can be stored all at once in the disconnect bushing, so there is no need to install equipment on the cable side (load side) of the main circuit. They are not placed individually, making the switchboard more compact, wiring can be connected all at once, and it is convenient for maintenance and inspection.

〔Effect of the invention〕

According to the present invention, a zero-phase current transformer, a voltage detector, etc. are molded into the mounting portion of the disconnection bushing and are miniaturized, so that the number of work steps can be greatly reduced, and the switchboard can be made smaller.

[Brief Description of the Drawings] Figures 1 and 2 are detailed views of the disconnection type transformer of the present invention;
The figure is a side view showing an embodiment of a closed switchboard according to the present invention,
FIG. 4 is a side view of the closed switchboard of the Horai, and FIG. 5 is a conventional three-wire wiring diagram. □14...Conductor, 16
゛... U-shaped conductor, 21... Zero-phase current transformer, 22...
Current transformer, 23... Voltage detector, 24... Secondary terminal.

Claims (1)

[Scope of Claims] 1. A disconnector that connects a draw-out type circuit breaker, a current transformer, a cable head, and a zero-phase current transformer to the main circuit bus bar of a switchboard, and slides and opens on the primary side of the draw-out type circuit breaker. A closed switchboard comprising: a current transformer voltage detector, the zero-phase current transformer, and a disconnecting section bushing are integrally molded into a three-phase integral molding in the disconnecting section. 2. Arrange a contact on the drawer-type circuit breaker side of the disconnection part bushing, and place the zero-phase current transformer and voltage detector between the U-shaped conductors with the three phases contracted between the current transformers on the opposite side. The closed switchboard according to claim 1, characterized in that the closed switchboard is arranged and integrally molded.