JPH10108321A - Distribution board provided with earthquake sensing relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely perform protection against the phase interruption of a neutral line by providing a first system released immediately when an earthquake is detected and a second system which is not cut off, and using the neutral line in common to connect a trunk breaker to the neutral line. SOLUTION: On the load side of a trunk breaker 1, the branch breaker group 2 of a first system and the branch breaker 5 of a second system are provided, the branch breaker 2 of the first system is connected to an opening and closing part 7 on the secondary side, and when the contacts 4 of an earthquake sensing relay 3 output a cut-off signal to the opening and closing part 7 immediately after sensing an earthquake, the contacts 4 are cut off all at once. The second system is not cut off in sensing an earthquake, and the contacts 6 of the earthquake sensing relay 3 output a cut-off signal to the trunk breaker 1 at the recovery of service interruption to cut off the trunk breaker 1 and however, the neutral line 8 of the first system is used in common without passing through the neutral line and the contacts of the second system to be connected to the neutral pole of the trunk breaker 1. As a result, since the protection against the phase interruption of the neutral line of both systems is completely performed by a single trunk breaker, the protection from an overvoltage can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution board provided with a seismic relay for interrupting a branch circuit when an earthquake is detected.

[0002]

2. Description of the Related Art In order to prevent fires caused by the recent earthquake,
It is being considered to install a seismic relay to cut off the circuit when an earthquake is detected in a distribution board for a house. However, if all the branch circuits are cut off at the same time as detecting the earthquake, the house will be in a blackout state, and evacuation may be difficult at night.

Accordingly, the present invention has developed a distribution board having two systems on the load side of the main breaker 1 as shown in FIG. 2, and has already applied for a patent as Japanese Patent Application No. 8-159351. . In the distribution board shown in FIG. 2, the branch breaker group 2 of the first system is immediately shut off by the immediate trip contact 4 when the seismic relay 3 detects an earthquake, but the branch breaker group 2 of the second system. Group 5 is not shut off immediately upon detection of an earthquake, but is tripped by opening the main breaker 1 when the power company resumes power transmission after a power outage and the trip contact 6 of the seismic relay 3 is opened. Has become. However, it has been found that this distribution board has the following practical problems.

In the first system of the distribution board, a branch breaker 2 having an external voltage tripping function is used, and the seismic relay 3 supplies a tripping current according to the number of branch breakers 2. There is a need. For this reason, when the number of branch breakers 2 of the first system increases, the tripping current to be supplied by the seismic relay 3 also increases. Become. Since the number of branch breakers 2 with an external voltage trip function increases according to the number of branches of the first system, wiring work from the seismic relay 3 to each branch breaker 2 becomes troublesome. Since the branch breaker 2 with the external voltage tripping function is expensive, the price of the distribution board increases. Due to the above problems, the number of branch breakers 2 of the first system of the distribution board is limited. But,
In recent years, distribution boards have tended to be multi-branched with the electrification of facilities. It was difficult to cope with hyperbranching.

In order to solve the above-mentioned problems, the present invention and the like, as shown in FIG. 3, use a low-cost inexpensive circuit which does not have an external voltage tripping function. A prototype of a distribution board, which is a branch breaker, in which the first system receives a signal from a seismic relay when an earthquake is detected and is shut off all at once by an open / close unit 7 that is opened immediately. In the distribution board shown in FIG. 3, the above problem can be solved because the seismic relay 3 only needs to supply a tripping current to one switching unit 7.

However, the distribution board of FIG. 3 has another problem. That is, in a single-phase three-wire distribution board for a house, the detection lead wire for the protection of the neutral line open phase of the main breaker 1 is connected to the neutral pole of the main bar, and the neutral line open phase protection is performed. ing. However, in the switchboard shown in FIG. 3, when a three-pole breaker having no neutral line open phase protection function is used for the switching unit 7, phase loss occurs due to defective contact or connection of the neutral electrode of the switching unit 7. , Even if an abnormal voltage is generated in the first system, the neutral line open phase protection function of the main circuit breaker 1 does not work, and the load equipment connected to the first system cannot be protected. Become. This problem can be avoided by using a breaker with neutral line open phase protection instead of a three-pole breaker without neutral line open phase protection function in the opening / closing section 7, but the price of the distribution board increases. Becomes

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and comprises a first system which is opened immediately when an earthquake is detected, and a second system which is not shut off when an earthquake is detected. It is intended to provide a distribution board equipped with a seismic relay that does not require the use of expensive and expensive equipment, has less wiring work, and can completely protect the neutral line open phase. It is.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The present invention is characterized in that the load side of a main breaker is connected to a switch which is opened immediately upon receiving a signal from a seismic relay when an earthquake is detected. A first system consisting of a group of branch breakers and a second system consisting of a group of branch breakers that are not interrupted when an earthquake is detected are provided, and the neutral lines of both systems are shared and connected to the neutral pole of the main breaker. It is characterized by having done. It is preferable to use a seismic relay having a contact that outputs a shut-off signal to the switching unit immediately after sensing the earthquake and a contact that outputs a shut-off signal to the main breaker when power is restored after a power failure due to an earthquake. The opening / closing part can be provided integrally with or separately from the seismic relay.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing an embodiment of the present invention. As described with reference to FIG. 3, 1 is a main breaker, 3 is a seismic relay, and 7 is a two-pole opening and closing. Department. On the load side of the main breaker 1, a branch breaker group 2 of a first system and a branch breaker group 5 of a second system are provided.

[0010] The branch breaker group 2 of the first system includes an opening / closing section 7.
When the contact 4 of the seismic relay 3 outputs a shutoff signal to the switching unit 7 immediately after the detection of the earthquake, the switching unit 7 is connected to the secondary side of the switching unit 7.
Are opened, the first system is shut off all at once. However, the second system is not interrupted when an earthquake is detected, and the contact 6 of the seismic relay 3 is connected to the main breaker 1 when the power is restored after a power failure.
, And is shut off only when the main breaker 1 is opened. For this reason, if lighting and the like necessary for evacuation are connected to the branch breaker 5 of the second system, there is no possibility that the house will be completely out of power even if an earthquake occurs at night.

The above configuration is the same as that of FIG. 3, but in the present invention, as shown in FIG. 1, the neutral line 8 of the first system is shared with the neutral line of the second system without interposing a contact point. , The main breaker 1 is connected to the neutral pole. As a result, even if a relatively inexpensive two-pole breaker is used for the opening / closing section 7, the neutral line will not be interrupted at this portion. Can be done.
Further, in the present invention, it is not necessary to draw a neutral wire into the opening / closing section 7 as in the prior art, so that the main breaker 1 and the opening / closing section 7 are not connected to each other.
Only the voltage lines 9 need to be connected.

In addition, as shown in FIG. 1, the opening / closing section 7 is separate from the seismic relay 3, or the opening / closing section 7 and the seismic relay 3 can be integrated. In the distribution board shown in FIG. 1, the contact 6 of the seismic relay 3 outputs a shut-off signal to the main breaker 1 when power is restored. However, in the present invention, this function is not always essential and may be omitted. it can.

Further, the seismic relay 3 can be configured in the size of two safety breakers, and can be accommodated in the space of the branch breaker. Therefore, the opening / closing unit 7 is widely used for residential distribution boards. Can be incorporated into the attachment device mounting space provided in the device, and a low-priced distribution board having a minimum necessary shape can be obtained.

[0014]

The effects of the present invention can be summarized as follows. The first system can be shut off all at once by the opening / closing unit 7, and it is not necessary for the seismic relay 3 to individually supply the shut-off signal to a large number of branch breakers 2 as in the related art. Therefore, even if the number of branch breakers 2 of the first system increases, a large seismic relay 3 having a large contact capacity is not required, and the device can be made small and inexpensive. Further, since the branch breaker 2 does not need to use a breaker having an external trip function, an inexpensive distribution board can be provided.

The single main breaker 1 can completely protect the neutral line open phase protection of the first and second systems, and can reduce the load equipment connected to the first and second systems to the neutral line. It is possible to protect against overvoltage due to phase loss. In addition, an inexpensive two-pole breaker can be used for the opening / closing section 7, which makes it possible to reduce the cost of the equipment and eliminates the need to draw a neutral wire into the opening / closing section 7, thereby simplifying wiring.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a distribution board of the prior application.

FIG. 3 is a circuit diagram of an improved distribution board of the prior application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main breaker 2 Branch breaker of 1st system 3 Seismic relay 4 Contact for immediate tripping of seismic relay 5 Branch breaker of 2nd system 6 Contact for tripping of seismic relay 7 Switching part 8 Neutral Line 9 Voltage line

Claims (3)

[Claims] 1. A first system comprising a group of branch breakers connected to an opening / closing unit which is immediately opened upon receiving a signal from a seismic relay when an earthquake is detected, and a branch which is not interrupted when an earthquake is detected. A distribution board equipped with a seismic relay, wherein a second system comprising a group of breakers is provided, and a neutral line of both systems is shared and connected to a neutral pole of a main breaker. 2. The seismic relay has a contact for outputting a shutoff signal to the switch immediately after the detection of the earthquake, and a contact for outputting a shutoff signal to the main breaker when power is restored after a power failure due to the earthquake. A distribution board provided with the seismic relay according to claim 1. 3. A distribution board provided with the seismic relay according to claim 1, wherein the opening / closing part is provided integrally with or separately from the seismic relay.