JPS5932106Y2 - Phase separation bus bar current transformer mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a mounting device for a current transformer in a continuous jacket type phase separation busbar.

Recent phase-separated busbars are designed to electrically connect the outer sheath of the busbar along the length of the busbar, and short-circuit the ends of the three phases, so that the outer sheath receives a current of the opposite phase that is almost equivalent to that of the internal conductor. Continuous jacket types are widely used, which induce magnetic flux to eliminate leakage to the outside.

This has made it possible to alleviate the interphase electromagnetic force in the event of a short circuit, prevent heat generation in nearby structures, and enable large currents to flow.

In addition, depending on the plant, the phase separation bus can be used to grasp the current,
A current transformer may be installed for the purpose of failure detection, etc.

At this time, in a continuous jacket type phase-separated bus, there is no magnetic flux to the outside of the jacket as described above, so it is necessary to install a current transformer inside the jacket to measure the conductor current.

In addition, since the outer sheath is electrically connected in the longitudinal direction, it is necessary to locate the connection structure portion of the outer sheath that can be disassembled near the installation location in order to install or remove the current transformer.

FIG. 1 shows an example of a conventional installation device for a current transformer to a phase separation bus that satisfies the above requirements, and the figure shows the case of only one phase.

In FIG. 1, 1 and 2 are jackets, 3 and 4 are conductors, and 11 is a current transformer.

The outer sheaths 1 and 2 and the conductors 3 and 4, which are close to the installation position of the current transformer 11, are opposed to each other with a desired interval necessary for installing and removing the current transformer 11, and the conductors 3,
4 are connected by attaching a flexible conductor 6 with bolts 9, and outer sheaths 1 and 2 are connected by attaching a rubber bellows 5 for sealing with bolts 8. The flexible conductor 7 is attached to the bolt 10 for use.
They are connected by connecting them.

When removing the current transformer 11 installed inside the jacket connection part,
First, the bolts 10 are removed to remove the flexible conductor 7, then the bolts 8 are removed to move the rubber bellows 5 toward the jacket 1 or 2, and the bolts 9 are removed to remove the flexible conductor 6.

Moreover, when installing the current transformer 11, the above-mentioned operation is performed in reverse.

However, such a structure has the following drawbacks.

(a) When installing or removing a current transformer, in addition to parts such as the flexible conductor 6 that connects the conductors 3 and 4,
Since parts such as a bellows for sealing the space between the parts and a flexible conductor 7 for electrical connection are required, the structure becomes complex and expensive due to the large number of parts.

(b) Due to the large number of parts, installation and removal work takes time, and depending on the installation location, the work can be extremely difficult.

(c) When attaching the flexible conductor 7 to the outer sheaths 1 and 2, for example, when the flexible conductor 7 is made of copper and the outer sheaths 1 and 2 are made of aluminum, the parts that come into contact with the dissimilar metals may be exposed to moisture such as rain. Contact corrosion occurs, making it difficult to use outdoors.

This idea eliminates the above-mentioned drawbacks, and by arranging the current transformer at the right-angled bend of the phase-separated bus, the structure and parts are simplified and workability is improved. The purpose is to provide a current transformer mounting device.

An embodiment of this invention will be described below with reference to FIG.

Figure 2 shows the details of the right angle bend part of the phase separation bus bar.
It is connected by attaching a flexible conductor 14 to its end with a bolt 15.

In addition, an outer sheath 16.17 separately covers the conductor 12.13.
are integrally joined by means such as welding via the corner jacket 18, and the surface of the corner jacket 18 through which the conductor is not inserted is opened, and a flange 20 is provided on the outer peripheral edge of this opening 19, and the flange 20. The opening 19 is closed by attaching a cover 22 with bolts 21.

23 is a current transformer arranged concentrically with the conductor 13 within the corner jacket 18.

When removing the current transformer 23 in the device configured as described above, remove the bolts 21 and remove the cover 22, then remove at least the bolts 15 on the conductor 13 side, and remove the flexible conductor 14.
is separated from the conductor 13 (12).

In this state, the current transformer 23 is taken out from the opening of the corner jacket 18.

Furthermore, when installing the current transformer 23, the above operations may be performed in the reverse order.

As described above, this invention has a structure in which the current transformer is placed at the right angle bend of the phase separation bus, which simplifies the structure and requires fewer parts compared to the conventional current transformer mounting method. The workability of installing and removing the current transformer is also good, and it is also advantageous in terms of economy.

Further, since there is no need to connect the conductor sheaths with a flexible conductor as in the conventional case, contact corrosion does not occur and there are no restrictions on the place of use.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional current transformer mounting device for a phase-separated bus bar, and FIG. 2 is a sectional view of a current transformer mounting device for a phase-separated bus bar according to this invention. 12.13...Conductor, 14...Flexible conductor, 16.17...Sheath, 18...
Corner jacket, 20...Flange, 22...
...Cover, 23...Current transformer.

Claims (1)

[Scope of utility model registration request] The phase-separated bus conductors, which serve as the primary conductors of the current transformer, are separated from each other and arranged at right angles, and each conductor is separably connected by a flexible conductor, and the outer sheath that covers each of the conductors separately is placed at the corner. A current transformer that is integrally coupled by an outer sheath and is electromagnetically coupled to the one conductor is disposed within the corner sheath, and an opening is provided in the corner sheath facing the current transformer. A current transformer mounting device for a phase separation bus bar, characterized in that a cover that is normally closed is attached to the opening.