Power supply system capable of automatically switching power supply

Abstract

The utility model discloses a power supply system capable of automatically switching a power supply, which comprises a 220v power supply, a live wire and a null wire are provided with circuit breakers QF1, and a power-off time-delay relay KT1, a power-on time-delay relay KT2 and an alternating current contactor KM1 are sequentially arranged on an access of the 220v power supply; a contact of a power-on time-delay relay KT2 is also arranged on the path of the alternating current contactor KM1 and the live wire; the 380v power supply comprises a live wire A, a live wire B, a live wire C and a zero wire; an output circuit of the 380v power supply is provided with contacts of a circuit breaker QF2 and an alternating current contactor KM2; an alternating current contactor KM2 is arranged between the null line and the live wire A of the 380v power supply; wherein the output zero line of the 380v power supply is connected with the output zero line of the 220v power supply through the contact of the alternating current contactor KM1, and the output live wire A, the output live wire B and the output live wire C of the 380v power supply are connected with the output live wire of the 220v power supply through the contact of the alternating current contactor KM1 in sequence. Therefore, when one power supply breaks down, the other power supply can be automatically put into use, and timely power supply of equipment is ensured.

Description

Technical Field

[0001] The utility model relates to a power supply system for automatically switching power supply. Background Art

[0002] With the development of electrification technology, the requirements for the reliable operation of disconnectors are getting higher and higher. In the early days, power supplies were all supplied by one power source. Once a failure occurred, the disconnector would not be able to achieve electric operation. In some power usage scenarios or industries, a two-power supply solution for the electric operating mechanism has been proposed, one for the main power supply and one for the backup power supply. When the main power supply fails or is under maintenance, it needs to automatically switch to the backup power supply, and when the main power supply is restored, it automatically switches back. However, at this stage, power switching is mainly manual switching. When one power source fails, manual operation is required, and the other power source cannot be put into use in time, which cannot meet the power demand of the equipment. Utility Model Content

[0003] In view of this, the utility model provides a power supply system for automatically switching power supplies. When one power supply fails, another power supply can be automatically put into use to ensure timely power supply to equipment.

[0004] In order to solve the above technical problems, the utility model provides a power supply system for automatically switching power sources, comprising:

[0005] 220v power supply, the live wire and the neutral wire of the 220v power supply are provided with a circuit breaker QF1, and the path of the 220v power supply is provided with a power-off delay relay KT1, a power-on delay relay KT2 and an AC contactor KM1 in sequence; the power-off delay relay KT1, the power-on delay relay KT2 and the AC contactor KM1 are respectively connected in parallel, and the contact of the power-on delay relay KT2 is also provided on the path between the AC contactor KM1 and the live wire;

[0006] 380v power supply, 380v power supply is a three-phase four-wire transmission mode, including live wire A, live wire B, live wire C and neutral wire; the output circuit of the 380v power supply is provided with contacts of circuit breaker QF2 and AC contactor KM2; and an AC contactor KM2 is provided between the neutral wire and live wire A of the 380v power supply; wherein,

[0007] The output neutral line of the 380v power supply is connected to the output neutral line of the 220v power supply through the contacts of the AC contactor KM1, and the output live wires A, B and C of the 380v power supply are connected to the output live wire of the 220v power supply in turn through the contacts of the AC contactor KM1.

[0008] As an optional method, the end of the AC contactor KM2 between the neutral wire and the live wire A of the 380V power supply close to the live wire A is also connected to the contact of the power-off delay relay KT1.

[0009] As an optional method, an AC contactor KM1 is provided on the path from the live wire A, live wire B, live wire C of the 380V power supply to the live wire of the 220V power supply as a connection.

[0010] The beneficial effects of the utility model are:

[0011] The utility model does not require manual operation when switching power, and switches automatically with power priority; it can switch freely between single-phase power supply and three-phase power supply. And the automatic switching has a delay to ensure the safety of switching. When performing actual equipment matching, it can also be expanded to a mode of manual switching + automatic switching power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of the circuit structure of an automatic switching power supply provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0014] Example

[0015] See also Figure 1 This embodiment provides a power supply system for automatically switching power sources, including:

[0016] 220v power supply, the live wire and the neutral wire of the 220v power supply are provided with a circuit breaker QF1, and the path of the 220v power supply is provided with a power-off delay relay KT1, a power-on delay relay KT2 and an AC contactor KM1 in sequence; the power-off delay relay KT1, the power-on delay relay KT2 and the AC contactor KM1 are respectively connected in parallel, and the contact of the power-on delay relay KT2 is also provided on the path between the AC contactor KM1 and the live wire;

[0017] 380v power supply, 380v power supply is a three-phase four-wire transmission mode, including live wire A, live wire B, live wire C and neutral wire; the output circuit of the 380v power supply is provided with contacts of circuit breaker QF2 and AC contactor KM2; and an AC contactor KM2 is provided between the neutral wire and live wire A of the 380v power supply; wherein,

[0018] The output neutral line of the 380v power supply is connected to the output neutral line of the 220v power supply through the contacts of the AC contactor KM1, and the live wires A, B and C of the 380v power supply are connected to the output live wire of the 220v power supply through the contacts of the AC contactor KM1 in turn.

[0019] As an optional method, the end of the AC contactor KM2 between the neutral wire and the live wire A of the 380V power supply close to the live wire A is also connected to the contact of the power-off delay relay KT1.

[0020] As an optional method, an AC contactor KM1 is provided on the path from the live wire A, live wire B, live wire C of the 380V power supply to the live wire of the 220V power supply as a connection.

[0021] In the above scheme, the circuit breaker QF1 is the QF1-AC220V power main switch, which is used to connect or disconnect the AC220V power supply, and the circuit breaker QF2 is the QF2-AC380V power main switch, which is used to connect or disconnect the AC380V power supply. The power-off delay relay KT1 is used to delay the connection of the AC contactor KM2 when the power is off, and the power-on delay relay KT2 is used to delay the connection of the AC contactor KM1 when the power is on. The AC contactor KM1 is used to connect or disconnect the AC220V power supply, and the AC contactor KM2 is used to connect or disconnect the AC380V power supply.

[0022] In this embodiment, the automatic power switching is implemented as follows:

[0023] When there is AC220V power supply but no AC380V power supply, QF1 is closed, the coil of the power-off delay relay KT1 and the coil of the power-on delay relay KT2 are both energized, the corresponding contacts of the KT2 relay are closed with a delay, and the contacts of the KT1 relay are disconnected instantly. After that, the coil of the AC contactor KM1 is energized and the coil of the AC contactor KM2 is de-energized, then the AC220V power supply is connected and the AC380V power supply is disconnected, and the back-end AC220V equipment is energized and can work normally.

[0024] When there is AC380V power supply but no AC220V power supply, QF2 is closed, the coil of the power-off delay relay KT1 and the coil of the power-on delay relay KT2 are both de-energized, the corresponding contacts of the KT2 relay are disconnected, and the contacts of the KT1 relay are connected. After that, the coil of the AC contactor KM1 is de-energized, and the coil of the AC contactor KM2 is energized, then the AC220V power supply is disconnected, and the AC380V power supply is connected, and the rear-end AC220V equipment is powered on and can work normally. At this time, the rear-end AC220V equipment is connected to each phase of the three-phase power supply.

[0025] When both the AC220V power supply and the AC380V power supply are powered, QF1 and QF2 are closed, the coil of the power-off delay relay KT1 and the coil of the power-on delay relay KT2 are energized, the corresponding contacts of the KT2 relay are delayed closed, and the contacts of the KT1 relay are instantly disconnected. After that, the coil of the AC contactor KM1 is energized and the coil of the AC contactor KM2 is de-energized, then the AC220V power supply is connected and the AC380V power supply is disconnected, and the back-end AC220V equipment is powered on and can work normally. At this time, the AC220V power supply takes priority.

[0026] When the equipment is using AC220V power and AC380V power is also powered, if the AC220V power is suddenly cut off at this time, the coil of the power-off delay relay KT1 and the coil of the power-on delay relay KT2 will both be de-energized, the contacts of the KT2 relay will be instantaneously disconnected first, and the contacts of the KT1 relay will be delayed and closed. After that, the coil of the AC contactor KM1 will be de-energized and the coil of the AC contactor KM2 will be energized, then the AC220V power will be disconnected and the AC380V power will be connected, the back-end AC220V equipment will be powered on and can work normally, and it will automatically switch to AC380V power.

[0027] When the equipment is using AC380V power and AC220V power is off, if AC220V power is suddenly on, the coil of power-off delay relay KT1 and power-on delay relay KT2 will be energized, the contact of KT1 relay will be instantaneously disconnected first, and the contact of KT2 relay will be delayed to close, after which the coil of AC contactor KM1 will be powered off and the coil of AC contactor KM2 will be powered on, that is, the AC380V power is cut off first and then the AC220V power is connected to prevent the two power supplies from short-circuiting. Then the AC380V power is disconnected and the AC220V power is connected, and the back-end AC220V equipment can work normally after being powered on, and it will automatically switch to AC220V power at this time.

[0028] Thus, through this embodiment, no manual operation is required when switching power, and the power is switched automatically with power priority; it can switch freely between single-phase power supply and three-phase power supply. And the automatic switching has a delay to ensure the safety of switching. What is not limited by this embodiment is that when performing actual equipment configuration, it can also be expanded to a mode of manual switching + automatic switching of power supply system.

[0029] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A power supply system for automatically switching power supply, characterized in that: include: 220v power supply, the live wire and the neutral wire of the 220v power supply are provided with a circuit breaker QF1, and the path of the 220v power supply is provided with a power-off delay relay KT1, a power-on delay relay KT2 and an AC contactor KM1 in sequence; the power-off delay relay KT1, the power-on delay relay KT2 and the AC contactor KM1 are respectively connected in parallel, and the contact of the power-on delay relay KT2 is also provided on the path between the AC contactor KM1 and the live wire; 380v power supply, the 380v power supply is a three-phase four-wire transmission mode, including live wire A, live wire B, live wire C and neutral wire; the output circuit of the 380v power supply is provided with contacts of circuit breaker QF2 and AC contactor KM2; and an AC contactor KM2 is provided between the neutral wire and live wire A of the 380v power supply; wherein, The output neutral line of the 380v power supply is connected to the output neutral line of the 220v power supply through the contacts of the AC contactor KM1, and the output live wires A, B and C of the 380v power supply are connected to the output live wire of the 220v power supply in turn through the contacts of the AC contactor KM1.

2. The power supply system of the automatic power conversion according to claim 1, characterized in that: The end of the AC contactor KM2 between the neutral wire and the live wire A of the 380V power supply close to the live wire A is also connected to the contacts of the power-off delay relay KT1.

3. The power supply system of the automatic power conversion according to claim 1, characterized in that: An AC contactor KM1 is provided on the path between the live wires A, B and C of the 380V power supply and the live wire of the 220V power supply as a connection.

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