JP2003134616A - Distribution panel with alarm function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the distribution panel door to be monitored and verified in the central monitoring room to see whether it is open or shut. SOLUTION: A series circuit comprising a door switch DOS that is turned on and off according to whether the door of the distribution panel PB is open or shut, a contact TM1b that is normally-on and is turned off 10 seconds after a timer is activated, and an inside-panel lighting lamp IL that illuminates the interior of the distribution panel PB are connected between busbars AC1 , AC2 . A series circuit comprising an alarm release contact RY1b that opens when the alarm output stops and a door alarm output transmission timer TM1, which activates 10 seconds after the door of the distribution panel PB is opened, is connected between an auxiliary busbar SB and the busbar AC2 , and at the same time an alarm circuit release confirmation timer TM2 is connected. The timer TM2 is activated when the alarm cancelling switch BS is pushed within 9 seconds after the door is opened. When this switch BS is pushed, the lamp IL remains lit, so that maintenance and inspection work can be performed.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard with an alarm function that prevents unnecessary operation of a switchboard due to an intruder's intrusion into a building or the like. . 2. Description of the Related Art A switchboard installed in a building is often subjected to maintenance and inspection because it is directly connected to power supply equipment in the building. During maintenance and inspection work, when the door of the switchboard is opened, the lighting inside the panel is usually turned on in conjunction with this operation, making maintenance and inspection work easier. [0003] As described above, in the maintenance and inspection work, there is no problem in opening and closing the door of the switchboard, but the switchboard is operated without permission by a suspicious person intruding. That is, there is a possibility that the lighting and computer equipment of the entire building may become unusable due to a power failure. However, in the current switchboard, since maintenance and inspection work is prioritized, anyone can open and close the switchboard door, and there is a risk that the switchboard may be inadvertently operated. However, measures to prevent such actions are hardly adopted in current switchboards. The present invention has been made in view of the above circumstances, and if the release switch is not operated within a certain period of time by opening the door of the switchboard, an alarm is issued and the panel lighting is turned off, and the central monitoring is performed. An object of the present invention is to provide a switchboard with an alarm function that can monitor and confirm in a central monitoring room that opening and closing of a switchboard door has been performed by being notified to a room. SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an ON / OFF switch by opening and closing a door of a switchboard.
F, a door switch to be turned on, an in-panel illuminator that is turned on when the door switch is on, an alarm release switch provided in a switchboard, and an in-panel illuminator when a predetermined time has elapsed without turning on the alarm release switch. And a first timer for sending out to the central monitoring room as an alarm output that the door of the switchboard is continuing to be opened, and when the alarm release switch is turned on within a predetermined time, the first timer is turned off. A second timer for stopping the operation. Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a circuit connection diagram showing an embodiment of the present invention, in FIG. 1, AC _1, AC ₂ AC 1
This is a 00V bus. Between the buses AC ₁ and AC ₂ , a door switch DOS that is turned ON and OFF by opening and closing the door of the switchboard PB, and is always ON and is turned off after a predetermined time elapses, for example, 10 seconds after the timer operation. , And a series circuit of an in-panel illumination lamp IL that illuminates the inside of the switchboard PB. [0008] to the common connection point CM1 of the door switch DOS and contact TM1b is, auxiliary bus SB connected to, is between the auxiliary bus SB and the bus AC _2, contacts for alarm release to open at the time of the alarm output stop A series circuit of RY1b and a timer TM1 for outputting a door open alarm output which operates 10 seconds after the door of the switchboard PB is opened is connected, and an alarm circuit release confirmation timer TM2 is connected. Timer TM2 is
It operates when the alarm release switch is pressed within 9 seconds after the door is opened. BS is an alarm release switch, which is turned on (always off) by the operation of the switch BS and the timer TM2.
And, a contact TM2a to OFF, a series circuit consisting of the relay RY1 and the door switch DOS for alarm release is connected between bus AC _1, AC ₂ after 9 seconds. RY1a is a self-holding contact of the relay RY1. The contact TM1a is for outputting an external alarm of the timer TM1, and the contact TM1a is connected to the switchboard P1.
It operates 10 seconds after the door switch DOS of B is turned on and sends an alarm output signal to the outside. In the embodiment constructed as described above, when the door of the switchboard PB is opened for maintenance and inspection work, the door switch DOS is turned on, the illumination lamp IL in the panel is lit, and the interior of the panel is illuminated. Is done. When the alarm release switch BS is operated within 9 seconds after the illumination lamp IL in the panel is turned on, the timer TM2 is operated, and the contact TM2a is turned on.
N, and the relay RY1 operates. Relay RY
1 is held by itself, the contact RY1b of the relay RY1 is turned off, and the operation of the timer TM1 stops. As a result, the contact TM1a remains OFF, so that no alarm output is sent. As described above, at the time of maintenance and inspection, the operator can operate the alarm release switch BS in the switchboard PB. However, when a person other than the operator opens the door of the switchboard PB,
The door switch DOS is turned on, and the lamp I
L lights up. After turning on the lamp IL, a certain time, for example, 1
If the alarm release switch BS is not operated even after 0 seconds, the timer TM1 operates and the contact TM1b is turned off.
Change to F. For this reason, the lamp IL is turned off, and at the same time, the external alarm output contact TM1a is turned on, and an alarm sounds, for example, in the central monitoring room or the room where the switchboard PB is located, and the switchboard PB is not known. It is recognized that someone has operated the switchboard PB. FIG. 2 is a flowchart showing the above operation. In FIG. 2, step S1 is a switchboard PB
Recognizes that the door has been opened, the illumination lamp IL inside the panel
Lights up in step S2. Thereafter, it is determined whether or not the alarm circuit is released by the switch S3. If the alarm circuit is released, if the alarm release switch BS is operated within a release time of, for example, 9 seconds, the lighting of the panel lighting is maintained as in step S4. Will remain. However, if the alarm circuit is not released in step S3, the timer TM1 operates, the lighting in the panel is turned off in step S5, an external alarm output is sent out in step S6, and no one who knows the power distribution board PB. The operation of the switchboard PB can be monitored in the central monitoring room, and maintenance personnel can be dispatched. [0015] As described above, according to the present invention,
If the door of the switchboard is opened and the release switch is not operated within a certain period of time, an alarm is issued, the panel lighting is turned off, and this is notified to the central monitoring room, so that the opening and closing of the switchboard door is centrally monitored. There is an advantage that it can be monitored and confirmed from the room.

[Brief description of the drawings] FIG. 1 is a circuit connection diagram showing an embodiment of the present invention. FIG. 2 is an operation flowchart of the embodiment. [Explanation of symbols] DOS ... Door switch IL… In-panel lighting lamp TM1, TM2 ... Timer BS… Alarm release switch RY1 ... Relay

Claims (1)

Claims 1. A door switch that is turned on and off by opening and closing a door of a switchboard, and when the door switch is on,
The illuminated panel illumination light, the alarm release switch provided on the switchboard, and the alarm release switch are not turned on, and after a certain period of time, the panel illuminator is turned off and the door of the switchboard is kept open. A first timer for sending an alarm output to the central monitoring room as an alarm output, and the first timer when the alarm release switch is turned on within a predetermined time.
A switchboard with an alarm function, comprising: a second timer for stopping the operation of the timer.