JPH10149854A - Terminal board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add the functions of a current transformer and a zero-phase current transformer, measure the positive-phase current, negative-phase current, and zero-phase current flowing in a low-voltage electric path, improve the fitting space, and easily cope with the change of operating conditions. SOLUTION: This terminal board 9 is used for the low-voltage electric path of a receiving/distributing facility, and at least two or more terminal board conductors 17 each having connection sections 18 connected to lines 2 such as electric wires or cables at both end sections are arranged in parallel. A circular zero-phase current transformer 15 surrounding the conductors 17 in the lump is provided on one side of the center sections of the conductors 17, and circular current transformers 13 surrounding the individual conductors 17 are provided on the other side of the center sections of the other conductors 17 except for at least one conductor 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal block used for a low-voltage circuit such as a low-voltage switchboard or a distribution board of a power receiving and distribution facility.

[0002]

2. Description of the Related Art Wiring in a conventional switchboard will be described with reference to FIG. 3A of a schematic perspective view and FIG. 3B of the circuit diagram of FIG. 3A. A wire 2 such as a three-phase electric wire or cable of a low-voltage path connected to the bus 1 is wired to a load via a circuit breaker 3 and a terminal block 4 in the switchboard, and is connected to the load.
Between the two wires 2, an annular current transformer 5 surrounding each wire 2 is provided, and the three wires 2 wired from the terminal block 4 to the load enclose each wire 2 collectively. An annular zero-phase current transformer 6 is provided, an ammeter 7 is connected to the current transformer 5, and a ground fault overcurrent relay 8 is connected to the zero-phase current transformer 6.

[0005] Of the current flowing through the terminal block 4, the positive and negative phase components are transformed into values suitable for measurement by the current transformer 5 and the zero-phase component is transformed by the zero-phase current transformer 6.

[0004]

In the case of the conventional wiring of the switchboard, the terminal block 4 has a function of supplying a rated current and a wire 2.
Has a function of reliably connecting the current transformer 5 and the zero-phase current transformer 6 to measure the current flowing through the terminal block 4, respectively. There is a problem that a space for mounting the zero-phase current transformer 6 is required, it is difficult to store the zero-phase current transformer 6 in a narrow switchboard, and the mounting work of those is complicated.

Further, if the use conditions are changed after the current transformer 5, the terminal block 4, and the zero-phase current transformer 6 are mounted and delivered, they must be replaced according to the change. There is a problem that it takes a lot of time and it is difficult to respond to a change in use conditions.

In view of the above, the present invention adds the functions of a current transformer and a zero-phase current transformer, can measure the positive-phase current, the negative-phase current, and the zero-phase current flowing in the low-voltage piezoelectric path, and can reduce the mounting space. It is an object of the present invention to provide a terminal block which can be improved and can easily cope with a change in use conditions.

[0007]

In order to solve the above-mentioned problems, a terminal block according to the present invention is a terminal block used for a low-voltage path of a power receiving and distributing facility, and wires such as electric wires and cables are connected to both ends. At least two or more terminal block conductors having connection portions to be connected are arranged side by side, and an annular zero-phase current transformer enclosing each of the conductors is provided on one side of a central portion of each of the conductors. And an annular current transformer surrounding the individual conductors is provided on the other side of the central portion of the other conductors except for the above.

Therefore, an annular zero-phase current transformer enclosing each conductor is provided at one side of the central portion of each of the two or more conductors, and at least one other conductor except for at least one conductor is provided. Since the annular current transformer surrounding the individual conductors is provided on the other side of the central portion, it is not necessary to separately provide the current transformer and the zero-phase current transformer in the switchboard, and the mounting space is improved.

Further, when the operating conditions are changed, it is not necessary to replace the current transformer, the terminal block and the zero-phase current transformer individually in accordance with the change. It is shortened and can easily cope with changes in use conditions.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIG. 1A in a plan view and FIG. 1B in a front view taken along the line SS in FIG. 1A. In the figure, 9 is a terminal block, 10 is a terminal block 9
, 11 are four mounting holes arranged side by side on both sides of the mounting base 10, 12 is a front-rear recess formed in the center of the mounting base 10, and 13 is an extremely small annular three. This is a current transformer, and is arranged side by side on the left side of the recess 12. 14 is the current transformer 1
Reference numeral 3 denotes a mounting bracket for the recess 12, and reference numeral 15 denotes an oval annular zero-phase current transformer, which is mounted on the right side of the recess 12 by a mounting bracket 16.

Reference numeral 17 denotes four terminal block conductors arranged side by side on the mounting base 10. One side of the central part of each conductor 17 is collectively surrounded by the zero-phase current transformer 15, and the rear end conductor 17 is The other side of the central portion of each of the other conductors 17 is individually surrounded by the current transformer 13, and both ends of each conductor 17 are located above the mounting holes 11 on both sides. Reference numeral 18 denotes a connection portion at both ends of the conductor 17, reference numeral 19 denotes an insertion hole formed in the connection portion 18, reference numeral 20 denotes a bolt, and the insertion hole 1 is provided through a spring washer 21 and a flat washer 22.
9 is inserted. Reference numeral 23 denotes a nut screwed to the bolt 20, which is located in the mounting hole 11.

Reference numeral 24 denotes each mounting hole 11 on both sides of the mounting base 10.
The partition plate 25 erected in between is an outer plate erected before and after the mounting base 10.

Next, the wiring inside the switchboard using the terminal block 9 will be described with reference to FIG. 2A of a schematic perspective view and FIG. 2B of the circuit diagram of FIG. 2A. 3, the same reference numerals as those in FIG. 3 denote the same or corresponding elements, and the difference is that the current transformer 5 and the zero-phase current transformer 6 are not provided separately from the terminal block, but are connected to the bus 1. 2 is a circuit breaker 3 for wiring
Is connected directly to the terminal block 9, and is wired directly from the terminal block 9 to the load.

Each current transformer 13 is connected to the ammeter 7, and the zero-phase current transformer 15 is connected to the ground fault overcurrent relay 8.

The primary rated current of the current transformer 13 is the same as the rated current of the terminal block 9.
The terminal block 9 as a block can be commonly used for any of single-phase two-wire, single-phase three-wire, three-phase three-wire, and three-phase four-wire.

In the above embodiment, the current transformer 13 and the zero-phase current transformer 15 are mounted by the mounting brackets 14 and 16, but they may be molded on the mounting base 10.

The terminal block 9 has four terminal block conductors 17.
However, the present invention is not limited to this, and a dedicated terminal block may be used according to the case of single-phase two-wire, single-phase three-wire, or three-phase three-wire.

[0018]

Since the present invention is configured as described above, it has the following effects. In the terminal block of the present invention, at least two or more terminal block conductors 17 each having a connection portion 18 to which a wire 2 such as an electric wire or a cable is connected at both ends are arranged side by side. An annular current transformer 15 surrounding the conductors 17 collectively is provided, and an annular current transformer 13 surrounding the individual conductors 17 is provided on the other side of the central portion of the other conductors 17 except at least one. Therefore, it is not necessary to separately provide a current transformer and a zero-phase current transformer in the switchboard, and the mounting space can be improved.

Further, when the operating conditions are changed, it is not necessary to replace the current transformer, the terminal block and the zero-phase current transformer individually in accordance with the change, but only the terminal block 9 has to be replaced. Can be shortened, and it is possible to easily cope with a change in use conditions.

[Brief description of the drawings]

FIG. 1A is a plan view of one embodiment of the present invention, and FIG. 1B is a front view of A taken along the line SS.

2A is a schematic perspective view of wiring in a switchboard using the terminal block of FIG. 1, and FIG. 2B is a circuit diagram of A.

3A is a schematic perspective view of wiring in a switchboard using a conventional terminal block, and FIG. 3B is a circuit diagram of A.

[Explanation of symbols]

 2 wire 9 terminal block 13 current transformer 15 zero-phase current transformer 17 terminal conductor 18 connection

Claims (1)

[Claims] 1. A terminal block used for a low-voltage path of a power receiving and distributing facility, wherein at least two or more terminal block conductors having connection portions to which wires such as electric wires and cables are connected at both ends are arranged in parallel. An annular zero-phase current transformer enclosing each of the conductors was provided on one side of the center of each conductor, and each conductor was surrounded on the other side of the center of each of the other conductors except at least one of the conductors. A terminal block comprising an annular current transformer.