JPH05199662A - Uninterruptible power supply distribution system - Google Patents

Abstract

PURPOSE:To supply a voltage to a load in the case of a power interruption at the time of an accident or an inspection by connecting power output from an intermediate tap of a bypass transformer in parallel with a secondary side of an end power distribution transformer. CONSTITUTION:At the time of inspecting, for example, load output main lines 8a, 8b, power is supplied through a switch 12k, a main line bypass circuit 9, switches 121, 12m. At the time of inspecting power distribution transformers 10a, 10b, power output from an intermediate tap of a bypass transformer 3 is supplied to loads 21a, 21b through a power distribution bypass circuit 11 and switches 12p, 12q. Since the power phases of switches 12f, 12g are the same phase as those of the switches 12p, 12q, they can be switches without instantaneous power interruption. Thus, power can be supplied to loads 21a, 21b in the case of power interruption at the time of an accident or an inspection of the lines 8a, 8b, the transformers 10a, 10b, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an uninterruptible power distribution system.

[0002]

2. Description of the Related Art Normally, an uninterruptible power supply distribution system is a system in which a plurality of uninterruptible power supply units (UPS), a bypass transformer, a plurality of uninterruptible power supply units and a secondary circuit of each bypass transformer are switched without interruption. Instantaneous interruption switching circuit, maintenance bypass circuit that supplies power to the load during inspection of this instantaneous interruption switching circuit, bus that connects this maintenance bypass circuit and the output side of the instantaneous interruption switching circuit in parallel, and this bus is connected to the load Multiple output trunks,
An output trunk bypass circuit is provided for bypassing the output trunk during inspection of the output trunk.

By the way, as the capacity of the uninterruptible power distribution system having the above-described structure increases, the current capacity of the output trunk line and the circuit breaker for protecting the output trunk line also increases, which limits its application. For that reason, the output voltage of the uninterruptible power supply is increased and the current is supplied after being reduced, but in this case, there is no choice but to install a distribution transformer at the load end to drop to the voltage required by the load. .

[0004]

However, when inspecting a distribution transformer of the uninterruptible power supply system, the bypass circuit is not available because the output voltage of the uninterruptible power supply and the bypass transformer are different from the voltage required by the load. It cannot be configured, and the power supply to the load is stopped. Therefore, in order to continue the load power supply, it is necessary to install a spare bypass transformer or a distribution transformer, and there is a problem that the reliability of the power supply at the time of inspection is lacking.

The present invention has been made to solve the above problems, and an object thereof is to provide a highly reliable and economical uninterruptible power distribution system.

[0006]

In order to achieve the above object, the uninterruptible power supply distribution system of the present invention comprises a plurality of uninterruptible power supply devices connected to a power source and a bypass circuit of the uninterruptible power supply device. A bypass transformer, a busbar that connects the secondary sides of the plurality of uninterruptible power supply devices in parallel, and a non-interruptible switching circuit that switches the secondary sides of the bypass transformer and the uninterruptible power supply device without interruption. , A bus connecting in parallel this non-interruption switching circuit and a maintenance bypass circuit bypassing the non-interruption switching circuit, a plurality of load output trunks drawn from this bus, and a trunk bypass bypassing this load output trunk A circuit, a distribution transformer connected to the load output trunk line and the trunk bypass circuit, a secondary side of the distribution transformer, and a power source drawn from an intermediate tap of a secondary winding of the bypass transformer. Connect directly Characterized in that it consists of a distribution transformer bypass circuit.

[0007]

According to the uninterruptible power supply distribution system of the present invention, load power can be supplied even in the event of an accident or inspection of the output trunk line of the uninterruptible power supply and the distribution transformer by simply adding a simple circuit configuration. .

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a circuit configuration diagram of an embodiment of the present invention. As shown in the figure, the uninterruptible power supply distribution system of the present embodiment has a plurality of uninterruptible power supply devices 2a, 2b, 2c connected to the power supply 1.
A bypass transformer 3 forming a bypass circuit for the uninterruptible power supply devices 2a, 2b, 2c, and the uninterruptible power supply devices 2a, 2c.
In order to bypass the bus 4 for connecting the secondary sides of b and 2c in parallel, the uninterruptible switching circuit 5 for switching the secondary side of the bypass transformer 3 without interruption, and the uninterruptible switching circuit 5. Maintenance bypass circuit 6, and a parallel bus bar 7 that connects the secondary side of the hitless switching circuit 5 and the maintenance bypass circuit 6 in parallel,
A plurality of load output trunk lines 8 drawn from this parallel bus line 7
a, 8b, a trunk line bypass circuit 9 bypassing the load output trunk lines 8a, 8b and connected to the distribution transformers 10a, 10b, and a distribution transformer 10a, 10b connected to the load output trunk lines 8a, 8b. The non-interruption switching circuit 5, the load output trunk lines 8a and 8b, the trunk line bypass circuit 9, and the power distribution transformers 10a and 10b are bypassed by the power source drawn from the secondary side of the bypass transformer 3 and the secondary winding intermediate tap of the bypass transformer 3. It is composed of a power distribution transformer bypass circuit 11. 12a
˜12q is a switch, and 21a and 21b are loads.

Next, the operation of this embodiment will be described.
Buses 4, non-instantaneous interruption switching circuit 5, switches 12a, 12b, 12c, 12 from the uninterruptible power supply devices 2a, 2b, 2c at all times
d, 12e, distribution transformers 10a, 10b, switch 12
Power is supplied to the loads 21a and 21b via f and 12g.

Here, for example, the uninterruptible power supply devices 2a, 2b,
When any two of 2c are stopped or an accident occurs, the non-instantaneous interruption switching circuit 5 operates and power is supplied from the bypass transformer 3 via the switch 12h. Further, at the time of inspection of the non-instantaneous-interruption switching circuit 5, power is supplied via the switching path 12i, the maintenance bypass circuit 6, and the switching device 12j. Further, when inspecting the load output trunk lines 8a and 8b, power is supplied through the switch 12k, the trunk bypass circuit 9, and the switches 12l and 12m. When inspecting the distribution transformers 10a and 10b, the power source taken out from the intermediate tap of the bypass transformer 3 is applied to the loads 21a and 21b via the switch 12n, the distribution transformer bypass circuit 11, and the switches 12p and 12q. Can be supplied. Furthermore, since the power source phases of the switches 12f and 12g and the power source phases of the switches 12p and 12q are the same, they can be switched without interruption.

As described above, the power taken out from the intermediate tap of the bypass transformer 3 is used as the power distribution transformer 10 at the end.
By connecting in parallel to the secondary side of a and 10b, it is possible to limit the power outage range even when the power supply is interrupted in the event of an accident or inspection of the main line, providing an economical and uninterruptible power supply distribution system with improved reliability of power supply. it can.

As described above, in the present embodiment, a distribution transformer bypass circuit in which the same voltage as the load voltage is taken out from the center tap of the bypass transformer 3 and connected in parallel to the secondary side of the distribution transformers 10a and 10b. By installing 11, it is possible to supply power to the load output trunk lines 8a and 8b and power distribution transformers 10a and 10b even when a power failure occurs during an accident or during inspection.

[0013]

As described above, according to the present invention,
Highly reliable and economical uninterruptible power supply because load power can be supplied even in the event of an accident or inspection of the output main line of the uninterruptible power supply unit or distribution transformer by adding a simple circuit configuration. A power distribution system can be provided.

[Brief description of drawings]

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Power supply, 2a, 2b, 2c ... Non-stop power supply device, 3 ... Bypass transformer, 4 ... Bus line, 5 ... No interruption switching circuit, 6 ... Maintenance bypass circuit, 7 ... Bus line, 8a, 8b ... Load output trunk line , 9 ... Main line bypass circuit, 10a, 10b ... Distribution transformer, 11 ... Distribution transformer bypass circuit, 12a-12
q ... Switches, 21a, 21b ... Loads.

Claims (1)

[Claims] 1. A plurality of uninterruptible power supply devices connected to a power supply, a bypass transformer that constitutes a bypass circuit of the uninterruptible power supply device, and a busbar that connects the secondary sides of the plurality of uninterruptible power supply devices in parallel. And a non-interruptible switching circuit for switching the secondary side of the bypass transformer and the non-interruptible power supply without instantaneous interruption, and a non-interruptive switching circuit and a maintenance bypass circuit for bypassing the non-interruptible switching circuit. A bus bar connected in parallel, a plurality of load output trunk lines drawn from this bus bar, a trunk line bypass circuit bypassing the load output trunk line, and a distribution transformer connected to the load output trunk line and the trunk line bypass circuit, An uninterruptible power supply comprising a distribution transformer bypass circuit that directly connects the secondary side of the distribution transformer and a power supply drawn from an intermediate tap of the secondary winding of the bypass transformer. Power distribution method.