JP2563541Y2 - Synchronous phase control circuit for UPS system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous phase control circuit for a UPS system for instantaneously switching between a large-capacity uninterruptible power supply (UPS) and another power supply on the load side which is distributed.

[0002]

2. Description of the Related Art In a normal UPS system, when switching between a bypass power supply and instantaneous interruption is performed, as shown in FIG.
The P-side voltage is detected by a voltage detecting transformer PT having an angular displacement of 0 °, and the detected voltage e is input to the phase control circuit 2 and the UPS is
The synchronous phase control of the system 1 is performed, the output of the UPS system 1 is set to the same phase and the same voltage as the voltage of the bypass BP, and the switch S is switched.

[0003] In such a synchronous phase control of a UPS system, a bypass power supply is provided near a UPS main body, and a UPS power supply is provided.
There is no problem if the S power supply and the bypass power supply have a one-to-one relationship.

[0004] However, as shown in FIG.
The loads L _{1 to} L _n distributed from the system 10 include:
Supplied via △ -Y connection transformers T _{11 to} T _1n for step-down,
If the bypass BP ₂₁ to BP _2n load side, such as the dropping △ -Y connection transformer T ₂ and the power supply, for performing MuMadoka sever conversion between bypass BP ₂₁ to BP _2n and UPS system 10 at the load terminal phase control of UPS system 10, a bypass BP ₂₁ to BP _2n, detecting a ... voltage e ₂₁ to e _2n of captures the phase control circuit 2 to the voltage via the switch SW _2, the output voltage of the UPS system 10 phase is set to be bypass BP ₂₁ to BP _2n and phase.

[0005] Figure 3 shows only load group connected to the step-down transformer T ₂ as a load side, load groups that require similar UPS system voltages and this high-voltage line is connected to a plurality actually ing.

[0006]

The phase control of the UPS system for instantaneous interruption switching between the load-side UPS power supply and the load-side bypass power supply detects a load-side bypass voltage and transmits the voltage by a long-distance cable. Since the data is imported to the UPS system body, the probability of occurrence of an accident increases, and the reliability of the system as a whole decreases.

[0007] The present invention has been made in view of such a conventional problem, and a purpose of the present invention is to provide a UPS that maintains reliability even when a large number of loads are distant.
It is an object of the present invention to provide a synchronous phase control circuit of a UPS system that can switch between a power supply and a bypass power supply without any interruption.

[0008]

In order to achieve the above object, a synchronous phase control circuit of a large capacity UPS system according to the present invention provides a UPS output voltage via a step-down transformer to a distributed load of a distribution system. In a large-capacity UPS system to be supplied, a UPS main body bypass power supply has a main body bypass switching voltage detector having an angular displacement of 0 ° and a load side bypass having an angular displacement opposite to the angular displacement of a load side transformer for stepping down the UPS voltage. A switching voltage detector is connected, and the detection voltages of the two voltage detectors are input to a phase control circuit via a changeover switch.
The PS power supply and the load-side UPS power supply can have the same phase and the same voltage as the main body-side bypass power supply and the load-side bypass power supply, respectively.

[0009]

When the changeover switch is set on the side of the main body bypass switching voltage detector having an angular phase of 0 °, the detection voltage input to the phase control circuit has the same phase as the UPS main body bypass voltage.
PS voltage is same phase and same voltage as main body bypass voltage
The S power supply and the UPS main body side bypass power supply can be switched without instantaneous interruption.

When the changeover switch is placed on the load side bypass switching voltage detector having an angular displacement opposite to the angular displacement of the load side transformer for stepping down the UPS voltage, the UPS voltage is the same as the UPS main body side bypass voltage. , The phase is shifted by the opposite angular displacement.

Therefore, the phase of the load side UPS voltage is UPS
Since the in-phase voltage is the same as that of the main-unit-side bypass voltage, and therefore the same-phase voltage as the load-side bypass voltage, the UPS power supply on the secondary side of the step-down transformer and the load-side bypass power supply can be switched instantaneously without interruption.

[0012]

FIG. 1 shows a large capacity UPS according to an embodiment of the present invention.
3 shows a synchronous switching circuit between the system and a load-side bypass. The same components as those shown in FIG. 3 are denoted by the same reference numerals, and the description thereof will not be repeated.

In FIG. 1, PT ₁ and PT ₂ are voltage detecting transformers (hereinafter simply referred to as PT ₁ and PT ₂ ) for detecting a main body bypass BP ₁ voltage and outputting a common mode voltage e ₁ and a 30 ° delay voltage e ₂ , respectively.
That PT _2), SW ₁ is a changeover switch for input to the phase control circuit 2 switches the detection voltage e _1, e ₂ of the PT _1, PT _2.

[0014] Thus, UPS system 10 and when performing MuMadoka sever conversion of the UPS unit side bypass BP _10, conventional Similarly PT ₁ by switching the switch SW ₁ to PT ₁ side
And the phase of the output voltage of the UPS system 10 is made to coincide with the bypass BP ₁₀ by the detection voltage e ₁ .

Further, the UPS system 10 loads bypass BP ₂₁ When performing the MuMadoka sever conversion between to BP _2n, detecting a 30 ° delay in PT ₂ by switching the changeover switch SW ₁ to PT ₂ side voltage e ₂ Controls the phase of the UPS system 10 and outputs an output delayed by 30 ° from the UPS system 10 via the switches S ₁ , S _{11 to} S _1n to the load-side transformers T _{11 to} T _1n.
Output to Thus, the output in the transformer T ₁₁ through T _1n is △ -Y connection goes 30 °, voltage and phase of the output voltage of the transformer T ₁₁ through T _1n bypass BP ₂₁ to BP _2n match, switch S ₁₁ ＳS _1n enables instantaneous interruption switching.

[0016]

The present invention is configured as described above, and has the following effects.

(1) The UPS power supply and the bypass power supply on the load side can be switched without instantaneous interruption while maintaining the reliability even when the load is unspecified and many and distant.

(2) The UPS is detected by detecting the load side bypass voltage.
The system is inexpensive because a phase control cable to be drawn into the main body is not required.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a power distribution system using a large-capacity UPS system according to an embodiment of the present invention.

FIG. 2 is a block circuit diagram showing an instantaneous interruption switching circuit in a normal UPS system.

FIG. 3 is a block circuit diagram showing a power distribution system using a conventional large-capacity UPS system.

[Explanation of symbols]

1, 10 ... UPS system 2 ... phase control circuit _{T, T 1, T 2,} T 11 ~T 1n ... step-down transformer PT, PT _1, PT ₂ ... voltage detector (voltage detection transformer) S _1, S _1n ~ S _1n , SW ₁ , SW ₂ ... changeover switches S _{11 to} S _1n , S _{21 to} S _2n ... switches L _{1 to} L _n ... load

Claims (1)

(57) [Scope of request for utility model registration] 1. A large-capacity UP that supplies a UPS output voltage to a distributed load of a distribution system via a step-down transformer.
In the S system, a UPS main body bypass power supply includes a main body bypass switching voltage detector having an angular displacement of 0 ° and a load side bypass switching voltage detection having an angular displacement opposite to the angular displacement of a load side transformer for stepping down the UPS voltage. And the detection voltages of the two voltage detectors are input to a phase control circuit via a changeover switch. By switching the changeover switch, the main body side UPS power supply and the load side UPS power supply are respectively connected to the main body side bypass power supply or the load. A synchronous phase control circuit for a UPS system, wherein the same phase and the same voltage as the side bypass power supply can be obtained.