JP4397145B2 - Phase arrangement conversion structure of three-phase main circuit conductor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a phase arrangement conversion structure for a three-phase main circuit conductor, in which three-phase main circuit conductors arranged in a line in a predetermined order can be easily changed from, for example, a front-rear arrangement to a left-right arrangement.
[0002]
[Prior art]
The details of the present invention will be described below by taking a switchboard as an example. When flowing a large three-phase main circuit current, a bare conductor such as a copper bar or a copper pipe is often laid in the switchboard with an insulator. If the phase order of each phase conductor is not determined at this time, there is a risk that the electric motor may rotate in the reverse direction or a major accident such as a short circuit between the phases. Therefore, the standard defines in what phase order the three-phase main circuit conductors laid in the switchboard are arranged. That is, when three phases are arranged in the front-rear direction, the first phase, second phase, and third phase are arranged in the order from the front side to the rear direction, and when arranged in the vertical direction, the first phase is arranged from the upper side to the lower direction. When arranged in the order of the second phase and the third phase, and arranged in the left-right direction, they are arranged in the order of the first phase, the second phase, and the third phase from the left to the right toward the switchboard. .
[0003]
For example, when the drawer type three-phase circuit breaker is housed in the switchboard and the circuit breaker can be pulled out from the front side of the panel, the main contact of the circuit breaker is the first phase from the left to the right, It becomes the arrangement of the second phase and the third phase. On the other hand, when a three-phase bus is laid from the upper side to the lower side of the switchboard side, the busbar is arranged in a first phase, a second phase, and a third phase from the front side of the switchboard to the rear. Therefore, when connecting this three-phase bus to the circuit breaker, the arrangement of the three-phase main circuit conductors must be changed from the front-rear direction to the left-right direction.
[0004]
FIG. 5 is a structural view showing a conventional example in which the three-phase main circuit conductors arranged in the front-rear direction are changed to the left-right arrangement. In the conventional example of FIG. 5, cylindrical first phase bus 1, second phase bus 2 and third phase bus 3 are vertically mounted and aligned in a row from the front side to the rear side. On the other hand, since the first phase conductor 4, the second phase conductor 5, and the third phase conductor 6 are arranged in a line from the left side to the right direction, it is easy to connect these phase conductors to the circuit breaker.
[0005]
[Problems to be solved by the invention]
By the way, in order to rearrange the three-phase buses arranged from the front side to the rear side from the left side to the right direction, as shown in FIG. 5, between the first phase bus 1 and the first phase conductor 4, It is necessary to interpose the first phase connection conductor 7 and the third phase connection conductor 8 between the third phase bus 3 and the third phase conductor 6. Furthermore, the first phase conductor 4, the second phase conductor 5 and the third phase conductor 6 must be bent.
[0006]
In other words, when changing the phase arrangement of the three-phase conductors, extra labor and time are required due to an increase in the number of main circuit connection points by using the extra connection conductors 7 and 8 and bending of the main circuit conductor. Cause inconvenience. Furthermore, since a large space is required for changing the phase arrangement of the three-phase conductor, there is a disadvantage that the switchboard must be enlarged.
[0007]
Accordingly, an object of the present invention is to make it possible to suppress as much as possible the labor and extra space required when changing the phase arrangement of the three-phase main circuit conductor.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a phase arrangement conversion structure for a three-phase main circuit conductor according to the present invention is a non-insulated second-phase main circuit of a three-phase circuit composed of a first phase, a second phase, and a third phase. The first first-phase main circuit conductor and the first third-phase main circuit conductor are arranged in a line at predetermined intervals on both sides of the conductor, respectively, and the first first-phase main circuit conductor is centered on the second-phase main circuit conductor. The second first-phase main circuit conductor is disposed at a position rotated 90 degrees from the one-phase main circuit conductor, and 90 degrees from the first third-phase main circuit conductor around the second-phase main circuit conductor. A second third-phase main circuit conductor is disposed at the rotated position, and the second first-phase main circuit conductor and the second third-phase main circuit conductor are arranged on both sides of the second-phase main circuit conductor. The first end of the first phase main circuit conductor and the start end of the second first phase main circuit conductor are arranged in a line at predetermined intervals, respectively. A linear first phase main circuit connection conductor is connected by a linear first phase main circuit connection conductor, and a terminal portion of the first third phase main circuit conductor and a start end portion of the second third phase main circuit conductor are linearly shaped third phase main circuit The connecting conductors are connected to insulate only the intermediate portion of the first phase main circuit connecting conductor and only the intermediate portion of the third phase main circuit connecting conductor .
[0009]
Further, in the above, the first phase main circuit connecting conductor and the third phase main circuit connecting conductor are structured to maintain a predetermined distance by an insulator .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a structural view showing a first embodiment of the present invention. In this first embodiment, cylindrical bus bars are attached in the vertical direction, and each phase thereof is a first phase bus 11 as a first first phase main circuit conductor and a second phase main circuit from the front side to the rear side. The second phase bus 12 as a conductor and the third phase bus 13 as a first third phase main circuit conductor are arranged in this order. In converting the arrangement in the front-rear direction to the arrangement in the left-right direction, the first phase as the second first-phase main circuit conductor is located at a position rotated 90 degrees from the first-phase bus 11 around the second-phase bus 12. The main circuit conductor 14 is installed, and the terminal end of the first phase bus 11 and the start end of the first phase main circuit conductor 14 are connected by the first phase main circuit connecting conductor 17. If the distance between the phase bus 12 and the first phase main circuit conductor 14 is G, the distance between the phase bus 12 and the first phase bus 11 is also G.
[0011]
Similarly, a third phase main circuit conductor 16 as a second third phase main circuit conductor is installed at a position rotated 90 degrees from the third phase bus 13 around the second phase bus 12, and the third phase bus 13 Are connected to the starting end of the third phase main circuit conductor 16 by the third phase main circuit connecting conductor 18, and the distance between the second phase bus 12 and the third phase main circuit conductor 16 at this time is G Thus, the distance from the third phase bus 13 is also G.
[0012]
Since the first phase main circuit connecting conductor 17 and the third phase main circuit connecting conductor 18 shown in the first embodiment are linear, the smallest distance between them and the second phase bus 12 is the bus. It becomes smaller than the distance G between each other. Therefore, it is needless to say that the interphase distance G between the bus bars needs to be made larger than the insulation distance corresponding to the bus voltage in advance.
[0013]
FIG. 2 is a structural diagram showing an application example of the first embodiment shown in FIG. 1. In this application example, the first phase main circuit connecting the first phase bus 11 and the first phase main circuit conductor 14 is shown. The connection conductor 27 has an arc shape, and the third phase main circuit connection conductor 28 that connects the third phase bus 13 and the third phase main circuit conductor 16 also has an arc shape. By making the main circuit connecting conductor into an arc shape, the distance between the two main circuit connecting conductors 27 and 28 and the second phase bus 12 is not reduced, so that it is possible to avoid increasing the interval between the buses more than necessary.
[0014]
FIG. 3 is a structural diagram showing the second embodiment of the present invention. The first phase main circuit connecting conductor 17 connecting the first phase bus 11 and the first phase main circuit conductor 14 is insulated at the intermediate portion thereof. 37. Similarly, the third phase main circuit connecting conductor 18 is also provided with an insulation 38 in the middle thereof, which is different from the first embodiment described in FIG. This is the same as the first embodiment described in FIG. By providing the insulation 37, 38 at the intermediate portion of each main circuit connecting conductor 17, 18, it is possible to avoid unnecessarily widening the phase spacing of the busbars as in the above-described application example.
[0015]
FIG. 4 is a structural view showing a third embodiment of the present invention. In the third embodiment, the phase arrangement can be easily converted by using the phase arrangement conversion board 40. This phase arrangement conversion board 40 includes the overall insulation of the first phase main circuit connection conductor 17 and the third phase main circuit connection conductor 18 in the first embodiment already described with reference to FIG. , 18 is achieved by resin molding.
[0016]
In each of the above-described embodiments, each phase bus and each phase main circuit conductor are shown as copper pipes. However, in the present invention, it is needless to say that a copper bar or a conductor other than copper can be used. is there.
[0017]
【The invention's effect】
The phase sequence when arranging three-phase main circuits in the front / rear, top / bottom or left / right direction is defined by the standard. For example, when changing from the front / rear direction to the left / right direction, the main circuit conductors are conventionally bent or connected. For this reason, there is an inconvenience that a main circuit connecting portion is increased, thereby requiring extra labor and time for connecting work, and requiring a large space for changing the arrangement.
[0018]
In the present invention, for example, by using a phase arrangement conversion board, it is possible to obtain an effect of greatly suppressing the labor of connection when converting the phase arrangement and a wide space required for the conversion.
[Brief description of the drawings]
FIG. 1 is a structural diagram showing a first embodiment of the present invention. FIG. 2 is a structural diagram showing an application example of the first embodiment shown in FIG. 1. FIG. 3 is a diagram showing a second embodiment of the present invention. FIG. 4 is a structural diagram showing a third embodiment of the present invention. FIG. 5 is a structural diagram showing a conventional example in which the three-phase main circuit conductors arranged in the front-rear direction are changed to the left-right arrangement. Explanation of]
DESCRIPTION OF SYMBOLS 1 1st phase bus 2 2nd phase bus 3 3rd phase bus 4 1st phase conductor 5 2nd phase conductor 6 3rd phase conductor 7 1st phase connection conductor 8 3rd phase connection conductor 11 1st 1st phase main First phase bus 12 as circuit conductor Second phase bus 13 as second phase main circuit conductor Third phase bus 14 as first third phase main circuit conductor Second phase bus 14 as second third phase main circuit conductor One-phase main circuit conductor 16 Third-phase main circuit conductors 17 and 27 as second third-phase main circuit conductors First-phase main circuit connection conductors 18 and 28 Third-phase main circuit connection conductors 37 and 38 Insulation 40-phase arrangement Conversion board

Claims (2)

A first first-phase main circuit conductor and a first third-phase main circuit conductor are arranged on both sides of an uninsulated second-phase main circuit conductor of a three-phase circuit composed of a first phase, a second phase, and a third phase. Arrange them in a row at predetermined intervals,
The second phase main circuit conductor is disposed at a position rotated 90 degrees from the first first phase main circuit conductor around the second phase main circuit conductor, and the second phase main circuit conductor is A second third-phase main circuit conductor is disposed at a position rotated 90 degrees from the first third-phase main circuit conductor around the center, and the second first-phase main circuit conductor is arranged on both sides of the second-phase main circuit conductor. The phase main circuit conductor and the second third phase main circuit conductor are arranged in a row at predetermined intervals, respectively.
A terminal portion of the first first-phase main circuit conductor and a start end portion of the second first-phase main circuit conductor are connected by a linear first-phase main circuit connection conductor, and the first third-phase main circuit conductor is connected. A terminal portion of the circuit conductor and a starting end portion of the second third-phase main circuit conductor are connected by a linear third-phase main circuit connection conductor;
Phase arrangement converting structure of the three-phase main circuit conductor characterized by applying insulation to only an intermediate portion of the intermediate portion only third phase main circuit connection conductors of said first phase main circuit connecting conductor. In the phase arrangement conversion structure of the three-phase main circuit conductor according to claim 1,
A phase arrangement conversion structure for a three-phase main circuit conductor, wherein the first phase main circuit connection conductor and the third phase main circuit connection conductor are structured to maintain a predetermined distance by an insulator.

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