JPS59148227A - Interlock unit for wiring breaker - 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 two circuit breakers that draw in power from two power supply systems, respectively, and an interlock device for the circuit breakers that connect the two power supply systems.

[Prior art]

As a stable and reliable power supply method for electrical loads such as electric motors, a method is used in which power is drawn in from two power supply systems using a circuit breaker and branched to each load.

An example is shown in FIG. Two AC power supplies ACI.

Power is drawn from the AC 2 via the circuit breakers 1 and 2, respectively, and power is supplied to the loads J, 1 to L4 via the circuit breakers 4 to 7. AC power supplies ACI and AC2 are connected through a circuit breaker 3, so that even if one AC power supply experiences a power outage, the load L
1 to L4 can be supplied with power.

As shown in FIG. 1, when drawing in from two AC power supplies ACI and AC2, it is essential to prevent the two power supplies from coming into contact with each other. Therefore, the following mutual interlock is required between the lead-in wiring breaker 1.2 and the connecting wiring breaker 3.

(1), Turn on the wiring breaker using the wiring breaker 2゜3.
One of the following must be "off".

(2) The circuit breaker 2 is turned on when the circuit breaker 1 is turned on.
Either one of 3 is "off".

(3) The circuit breaker 3 is turned on when the circuit breaker 1.
Either of 2 must be “off”.

If we summarize the above interloaf conditions, it is necessary to put one of the three wiring breakers in a state where the input operation is blocked.

Conventionally, in order to satisfy the interlock conditions (1) to (3) above, an electrically operated circuit breaker was used, and the contacts of the circuit breaker were used to electrically interlock the circuit breaker. ing.

However, this electrical interlock system requires many attached devices such as an electrical operating mechanism for the circuit breaker, an electrical interlock circuit, and an operating power source. For this reason, the reliability of the above-mentioned power supply system is reduced due to failure of the attached equipment. Furthermore, electrically operated circuit breakers are expensive and have the disadvantage of requiring limited storage space.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an interlock device for a circuit breaker that can realize a two-system power supply system with high reliability and at low cost.

[Summary of the invention]

In the present invention, two wiring circuit breakers drawn from two power supply systems and a wiring circuit breaker that connects the two power supply systems are arranged side by side, and the operation handle of one of these three wiring circuit breakers is operated at the same time. This is because an interlock fitting is provided with a cutout pattern to prevent the user from entering the device.

[Embodiments of the invention]

Figure 2 shows how the circuit breaker is installed.

The wiring breakers 1, 2.3 are fixed in parallel to the mounting plate 1o. FIG. 2 shows a case where the wiring circuit breakers 1 and 3 are in the on state as shown in FIG. 3(a), and the wiring circuit breaker 2 is in the off state as in FIG. 3(b). In addition, in Fig. 3, 9 indicates a terminal block.In order to satisfy the above-mentioned interlock condition when three wiring circuit breakers 1, 2, and 3 are arranged in parallel, the following (5) to This can be realized by using interlock fittings having the pattern (C).

(A) Only the circuit breaker 2 cannot be turned on.

(Mark: Only circuit breaker 1 cannot be turned on.)

0, only the circuit breaker 3 cannot be turned on.

These patterns (A) to (Q) can be realized by using an interlock fitting provided with a cutout pattern that allows the circuit breaker to be turned on.

FIG. 4 shows a combination of wiring circuit breakers 1 to 3 and interlock fittings 11 of pattern (A). A notch 11H is provided in the operation handle 8 portion of the wiring breaker 1.3 of the interlock fitting 11. The interlock fitting 11 is fixed to the circuit breakers 1 to 3 with screws 20. In FIG. 4, the wiring circuit breakers 1 and 3 have a relationship between their operation handles 8 and interlock fittings 11 as shown in FIG. 5(a), and are ready for use by officials. on the other hand,
The circuit breaker 2 becomes in a state where it cannot be turned on as shown in FIG. 5(b).

Based on this idea, the above pattern (4), (penalty.

(The interlock fitting 11 corresponding to Q is shown in Fig. 6(a).
-Create as shown in (C). Figure 6(a) shows the pattern (
N metal fitting 11A, the figure (b) is metal fitting 118 published by Pattern.
5 (C) shows the metal fitting 11C of the pattern (Q). The width of the notch IIHO of the interlock 11 is made slightly larger than the width of the handle 8.

FIGS. 7A to 7C show the state in which the interlock fittings 11A, IIB, and IIC having the cutout patterns shown in FIGS. 6A to 6C are mounted. In FIG. 7, the interlock fitting 11 is attached with screws (not shown) after the circuit breakers 1 to 3 are operated.

In this way, the two circuit breakers 1 and 2 used in the two-system power supply system and the communication circuit breaker 3 are interlocked, but expensive electrically operated circuit breakers are used as the circuit breakers. To prevent two AC power sources ACI and AC2 from coming into contact with each other without using anything. Interlocking three circuit breakers can be achieved by simply attaching interlock fittings prepared by cutting out patterns in advance, making it highly reliable and inexpensive to manufacture.

FIG. 8 shows another embodiment of the present invention.

FIG. 8 shows an arrangement in which interlock conditions (1) to (3) can be satisfied with one interlock fitting 13.

As shown in FIG. 9, the interlock fitting 13 of FIG. 8 is provided with two notches @13H1 and 13H2 of width t in the center and notches 13H3 and 13H4 of width 2t on both sides. The interlock fitting 13 is attached to the support plate 14 which is screwed and fixed to the mounting plate 10 in the direction in which the circuit breakers are arranged side by side (
It is supported so as to be slidable in the horizontal direction (as shown in the figure).

FIG. 9 shows the positional relationship between the circuit breakers 1 to 3 and the cutouts 13H1 to 13H4 in the case of pattern binding. The operation handle 8 of the circuit breaker 2 has notches 13 H1 and 13
It faces the convex portion (width t) between I'12. In addition, there is a notch in the center of the operation knob 8 of the circuit breakers 1 and 3.
! ! 13H3 and 13H4 are located at a position opposite to each other by a quarter of the center side.

In the embodiment shown in FIG. 8, patterns (A) to (0) can be formed by sliding the interlock fittings 13 in the juxtaposed direction.

FIG. 10 shows the states of each pattern (A) to (Q).

FIG. 10(a) shows the state of pattern (A). 10th
To change the state shown in FIG. 10(a) to the pattern (n) shown in FIG. 10(b), turn off the circuit breakers 1 and 3, and then slide the interlock fitting 13 to the left by a distance t. Then, the operation handle 8 of the wiring breaker 1
becomes unable to input. After that, wiring circuit breakers 2 and 3
Enter and operate.

Furthermore, changing from the state shown in FIG. 10(a) to the pattern shown in FIG. 10(C) (state Q) can be realized by sliding the interlock fitting 13 to the right by a distance t.

Similarly, in order to change from the state of FIG. 10(b) to the state of FIG. 10(C), move the interlock fitting 13 a distance of 2t to the right.
It can be done by just sliding.

As described above, in the embodiment shown in FIG. 8, interlocking can be achieved by sliding one interlock fitting in the direction in which the circuit breakers are arranged side by side. In the embodiment shown in FIG. 8, the operation is simple by simply sliding the interlock fitting. [Effects of the Invention] As explained above, according to the present invention, two It can interlock three wiring circuit breakers used in grid-fed systems, making it highly reliable and inexpensive.

[Brief explanation of drawings]

7(a) is a configuration diagram showing an example of an interlock fitting.
) to (C) are installation state diagrams of the interlock fittings, FIG. 8 is a perspective view showing another embodiment of the present invention, FIG. 9 is a configuration diagram showing an example of the interlock fittings, and FIG. 10(a) ~(C
) is a diagram showing how the interlock fittings are installed. (9) 1.2.3... Wiring breaker, 8... Operation knob, 11.13... Interlock fitting. Agent Patent Attorney Masami Akimoto (10) Figure 1, Section 2, 4-■ Figure 5 - 'Y-) 60 Figure 70 Figure 88 Figure q Figure 10

Claims (1)

[Claims] 1. Two wiring circuit breakers that turn on and off the power supply from the two power supply systems to the load, respectively, and a wiring circuit breaker that connects the two power supply systems are placed side by side, and among these three wiring circuit breakers, An interlock device for a circuit breaker, characterized in that one operation handle is provided with an interlock metal fitting provided with a cutout pattern to prevent simultaneous operations. 2. The interlock device for a circuit breaker according to claim 1, wherein the interlock fitting is slidable in a direction in which the circuit breakers are juxtaposed.