JPH04304127A - Uninterruptible power supply - Google Patents

Abstract

PURPOSE:To provide a system which is less in loss as compared with a normally standby system by confirming that an uninterruptible power supply for lighting in a tunnel is of a suspended standby system, but does not become defective periodically. CONSTITUTION:When AC power supply 1 is failed, a voltage detection circuit 6 detects the power failure, actuates an inverter 7, and supplies electric power to a load 8 by switching a switching circuit 3. Even when the AC power supply 1 is not failed, an automatic operation circuit actuates the inverter 7 at every set time to supply electric power to the load 8 from the inverter and supervisory equipment sends data to a central management office so as to confirm the state of facilities and presence/absence of a fault.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply device used for lighting tunnels for automobiles, etc.

0002

[Prior Art] In the incidental equipment of automobile tunnels, an uninterruptible power supply (hereinafter referred to as INV) for lighting is always used as a backup of the commercial power supply in order to ensure the safety of driving vehicles without completely extinguishing the tunnel lighting in the event of a commercial power outage. is installed. Conventional lighting INVs use a standby system, but this system starts up the inverter after the power is lost, so if the inverter were to malfunction, it would not be possible to detect the failure while it was at rest. . Therefore, as equipment installed for the purpose of backing up commercial power supply, there are many cases where it is extremely unstable. Furthermore, since the tunnel substation room (where the lighting INV is installed) is always unmanned, it is difficult to perform daily maintenance and inspections and discover failures. As a solution to this problem, one group has a no-load operation standby system, but this system, like the standby system, normally switches the switching circuit to the direct feed side and supplies the lighting load, but the three-phase inverter is not used. If the AC power supply is lost, the voltage detection circuit will detect the power outage and the switching circuit will be switched to the inverter to immediately supply power to the lighting load. In addition, when the AC power is restored, the voltage detection circuit detects the power restoration, the switching circuit is switched to the direct feed side again, and the three-phase inverter performs no-load operation.
In this case, since a three-phase inverter is normally operating,
Although it is possible to detect failures, since it is constantly operating, the rectifier capacity becomes larger than when it is on standby, and at the same time, no-load loss occurs, which increases the monthly electricity bill, so it is not worth the energy saving. There was a drawback.

0003

[Problems to be Solved by the Invention] In conventional INVs for tunnel lighting, when using a standby system, it is usually not possible to determine that equipment installed for backup purposes is out of order. The problem with the period method was that it was expensive (equipment costs and electricity charges).

[0004] Therefore, the purpose of the present invention is to periodically confirm that there is no failure in an INV for tunnel lighting, and to reduce loss (equivalent to the conventional standby system).
To provide an uninterruptible power supply device for tunnel lighting.

[Configuration of the invention]

[0006]

[Means for Solving the Problems] The present invention is composed of an AC power supply direct transmission circuit that directly supplies AC power to a load, a rectifier circuit, an inverter circuit, and a storage battery, and is configured to continue supplying AC power to the load even when the AC power supply is out of power. An uninterruptible circuit that supplies electric power, a switching circuit that switches between the uninterruptible circuit or the AC power direct feed circuit to supply AC power to the load, and a switching circuit that switches between the uninterruptible circuit or the AC power direct feed circuit to supply AC power to the load, and a switching circuit that forcibly shuts down for a predetermined period of time regardless of an AC power outage. This uninterruptible power supply is equipped with an automatic operation circuit that controls switching to the power outage circuit side.

[0007]

[Function] Automatically operates the INV periodically to supply load using an automatic operation circuit consisting of a timer with maximum A time and set x hours, a timer with maximum B time and set y minutes, and one auxiliary relay. .

[0008]

[Embodiment] Next, an embodiment of the present invention will be described. 1 and 2 are composed of an AC power supply direct transmission circuit 2 that directly supplies the AC power supply 1 to the load 8, a rectifier circuit 4, an inverter circuit 7, and a storage battery 5. An uninterruptible circuit 10 that supplies AC power, a switching circuit 3 that switches between the uninterruptible circuit 10 or the AC power supply direct feed circuit 2 and supplies AC power to the load 8, and The figure shows an uninterruptible power supply equipped with an automatic operation circuit 9 that forcibly switches to the uninterruptible circuit 10 side for a certain amount of time. That is, 1 is an AC power supply,
2 is an AC power direct feed circuit, 3 is a switching circuit such as a three-pole throw magnetic contactor, 4 is a three-phase full-wave rectifier, 5 is a backup storage battery, 6 is a voltage detection circuit, 7 is a three-phase inverter circuit, Reference numeral 8 indicates a load such as lighting, and in a normal operating system, the AC power source 1 is supplied to the load 8 via the AC power direct feed circuit 2, the switching circuit 3 is switched to the direct feed side. On the other hand, at this time, the rectifier 4 inputs the AC power supply 1, outputs DC, and
is charging. Further, at this time, the inverter 7 is in a stopped state. Here, if the AC power supply 1 is lost, the voltage detection circuit 6 detects the power outage, sends a start command to the inverter 7 to start it, inputs power from the storage battery 5, converts it to AC power, and switches the circuit 3 Switch to the inverter side, load 8
supply to On the other hand, when the AC power supply 1 is restored, the voltage detection circuit 6 detects the power restoration, switches the switching circuit 3 again to the direct transmission side, transmits power to the load 8, and at the same time sends a stop command to the inverter 7, causing it to stop and operate normally. enter the state. And 9
shows an automatic driving circuit, and details thereof are explained in FIG. 10 is a timer with A time and setting x time, 10a is the a contact of the timer 10 (a contact that turns on when x time comes), 11 is the auxiliary relay 11, the a contact of the auxiliary clay 11 (it turns on when the auxiliary relay is energized) 12 is a timer with a maximum B time setting of y minutes, and 12b is a b contact of the timer 12 (a contact that turns off after y minutes have elapsed). Since the tunnel substation room is always unmanned, remote monitoring and control equipment is used to transmit the status and failure indications of each equipment to the central management office (manned), and the equipment is managed centrally. Now maximum A time,
When the timer 10 with the setting x time operates periodically every x hours, the auxiliary relay 11 is excited by the contact 10a, and the timer 12 with the maximum B time setting y minutes operates by the contact a.
An operation command is sent to the inverter 7 for y minutes, and the three-phase inverter automatically performs no-load operation. Here, the switching circuit 3 is on the direct feed side because the AC power supply 1 has not been lost, but when this automatic operation circuit is activated, it is forcibly switched to the inverter side, supplies power to the load 8, and starts load operation. conduct. When y minutes have elapsed, the timer contact 12b activates the auxiliary relay 11.
is de-energized, the inverter 7 automatically stops, and at this time, the switching circuit 3 is forcibly switched to the direct feed side and enters the standby state again. When x time comes again, the above operation is repeated. This automatically operated state is transmitted to the center using remote monitoring and control equipment. In the event of an actual power outage, "Lighting INV
If the switching circuit is switched to the inverter side,
"INV power supply for lighting" was displayed on the center side, but it is displayed on the center side using the items "INV operation for lighting" and "INV power supply for lighting". In this way, regularly (x
Load operation is automatically performed for y minutes (every hour), and the load operation is sent to the center side and each time, lighting INV operation and power supply display are performed at the center side.

[0009]

[Effects of the Invention] According to the present invention, the INV for tunnel lighting
Since the system sends a status display to the center each time the load is operated, it is possible to check whether there is a failure at the center, and it can serve as a backup for the commercial power supply. In addition, since the load operation is performed periodically for y minutes about once a week, the capacity of the rectifier is the same as that of the conventional standby system, and there is no extremely large electricity bill, so it is sufficient to save energy. It becomes possible to create an uninterruptible power supply device for tunnel lighting that can contribute to this.

[Brief explanation of the drawing]

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

FIG. 2 is an explanatory diagram showing an example of an automatic driving circuit of the present invention.

[Explanation of symbols]

2 Direct AC power supply circuit 3 Switching circuit 9 Automatic operation circuit

Claims (1)

[Claims] Claim 1: An uninterruptible power supply system comprising an AC power supply direct transmission circuit that directly supplies AC power to a load, a rectifier circuit, an inverter circuit, and a storage battery, and continues to supply AC power to the load even when the AC power supply is out of power. a switching circuit that switches between the uninterruptible circuit or the alternating current power direct supply circuit to supply alternating current power to the load; and a switching circuit that forcibly forces the uninterruptible circuit for a predetermined period of time regardless of a power outage of the alternating current power supply. An uninterruptible power supply equipped with an automatic rotation circuit that controls switching to the side.