Intelligent dual-power automatic switching device

Abstract

The utility model relates to an intelligent dual-power-supply automatic switching device which comprises a control unit, a power supply sampling unit, a switching unit, a frequently-used power supply input unit, a standby power supply input unit and a power supply output unit. The output ends of the frequently-used power supply input unit and the standby power supply input unit are respectively provided with a power supply sampling unit; the number of the switching units is two, and the frequently-used power supply input unit and the standby power supply input unit are connected with the power supply output unit through the two switching units respectively. The control unit drives the switching unit to work, the switching unit has a switch state detection function, the switching unit transmits a switch state signal to the power supply sampling unit, then the power supply sampling unit transmits data to the control unit, and intelligent dual-power-supply switching can be achieved.

Description

Technical Field

[0001] The utility model relates to an intelligent dual-power automatic switching device, belonging to the technical field of power supply systems. Background Art

[0002] The dual power automatic switching device can complete the automatic switching of three-phase three-wire or three-phase four-wire dual power supply. It has a very wide range of applications, including hospitals, residential areas, airports, stations, docks, chemical industry, prevention and control, and many other places where power outages are not allowed.

[0003] For example, CN115085213A discloses a fault protection control method, device and medium for intelligent capacitor switching element. The conventional dual power automatic switching device uses a double-row composite contact, a horizontal connection mechanism and a single-chip microcomputer controller to detect two voltages simultaneously, and makes a logical judgment on the detection results. The power supply voltage higher than the rated value is judged as overvoltage, and the power supply voltage lower than the rated value is judged as undervoltage (or loss) voltage. The processing result sends an instruction to the operating mechanism through the drive unit. In the use of the equipment, the conventional dual power automatic switching device is used. This control mode has the following problems: 1. When normally connected, overheating or overcurrent causes damage to the contact or switch; 2. When the load circuit fails, the dual power switch automatically switches to the backup power supply, causing secondary damage to the power grid and the equipment therein; 3. It will not switch under special power failure conditions. Due to the complexity of power failure types, conventional products can often only switch under complete power failure conditions, and other power failures (including phase loss, abnormal phase sequence, etc.) will not switch. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the utility model provides an intelligent dual-power automatic switching device, which can realize intelligent switching of dual power supplies.

[0005] The technical solution of the utility model is as follows:

[0006] An intelligent dual power automatic switching device comprises a control unit, a power sampling unit, a switching unit, a normal power input unit, a backup power input unit and a power output unit; the output ends of the normal power input unit and the backup power input unit are each equipped with a power sampling unit; two switching units are provided, and the normal power input unit and the backup power input unit are respectively connected to the power output unit through the two switching units; the control unit drives the switching unit to work, the switching unit has a switch state detection function, the switching unit transmits the switch state signal to the power sampling unit, and then the power sampling unit transmits the data to the control unit.

[0007] The power sampling unit adopts a multifunctional power meter, and collects data through MODBUS communication, and transmits the data to the control unit for processing and control.

[0008] Wherein, the control unit adopts PLC as the control core.

[0009] The feature of the invention is that the common power input unit and the backup power input unit both use three-phase AC380V power, and the power output unit outputs three-phase AC380V power.

[0010] Wherein, the switching unit adopts a circuit breaker.

[0011] Wherein, the PLC control module adopts S7-200 module.

[0012] The utility model has the following beneficial effects:

[0013] The utility model detects two input signals in a power sampling unit, transmits signals such as voltage, current, frequency, phase sequence, and switch status to a control unit through MODBUS communication, and the control unit core adopts a PLC, which drives the switching unit circuit breaker to work through the power sampling unit data, thereby realizing dual power intelligent switching.

[0014] The utility model effectively collects power supply data through the power supply sampling unit. When an abnormal signal input is detected, the PLC can switch or shut down in time to avoid damage to contacts or switches caused by overheating or overcurrent when connected; the PLC has an automatic switching and self-recovery function, which can automatically switch on or off according to the type of load fault to avoid secondary damage to the power grid and equipment caused by load faults; the PLC system automatically reads the power supply sampling unit signal, and classifies the power supply fault (such as phase loss, overvoltage, undervoltage, frequency deviation, harmonics, etc.), and comprehensively checks the quality of the two power supplies, and automatically connects to the power supply with higher power quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a module diagram of the utility model.

[0016] The reference numerals in the figure represent:

[0017] 1. Control unit; 2. Power sampling unit; 3. Switching unit; 4. Normal power input unit; 5. Backup power input unit; 6. Power output unit. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] See also Figure 1 , the utility model provides a technical solution:

[0020] An intelligent dual power automatic switching device comprises a control unit, a power sampling unit, a switching unit, a normal power input unit, a backup power input unit and a power output unit; the output ends of the normal power input unit and the backup power input unit are each equipped with a power sampling unit; two switching units are provided, and the normal power input unit and the backup power input unit are respectively connected to the power output unit through the two switching units; the control unit drives the switching unit to work, the switching unit has a switch state detection function, the switching unit transmits the switch state signal to the power sampling unit, and then the power sampling unit transmits the data to the control unit.

[0021] Specifically, the power sampling unit adopts a multifunctional power meter, and the output end of the common power input unit and the standby power input unit are each equipped with a power sampling unit to collect signals such as voltage, current, frequency, phase sequence, and switch status, and transmit the collected data to the control unit for processing and control through MODBUS communication;

[0022] The control unit uses PLC as the control core, collects the voltage, current, frequency, phase sequence, switch status and other signals of the power sampling unit, and judges the quality of the common and backup power input signals through the collected voltage, current, frequency, phase sequence, and switch status signals, drives the switching unit to work, and maintains the power output. If it is found that the common and backup power inputs are abnormal or the power output is abnormal, the switching units are closed and there is no power output to protect the power supply equipment and load equipment.

[0023] The control unit is responsible for controlling the relevant data collected by the system and information exchange to ensure the normal operation of the entire control system. It is equipped with configuration software, which can configure the dual power system parameter screen, report, trend chart, etc., record historical data, and can be queried when a fault occurs, and determine the cause of the fault based on data analysis;

[0024] The switching unit adopts a circuit breaker, and the switching device also has a switch state detection function, which transmits the switch state signal to the power sampling unit, and transmits the data to the control unit along with the power sampling unit;

[0025] The common power input unit adopts a three-phase AC380V power supply, and the common power input unit is connected to the power output unit through a switching unit circuit breaker;

[0026] The backup power input unit adopts a three-phase AC380V power supply, and the backup power input unit is connected to the power output unit through a switching unit circuit breaker;

[0027] The power output unit outputs three-phase AC380V power, and the output unit is connected to the common and standby input units through the switching unit circuit breaker.

[0028] The utility model adopts electromechanical integrated intelligent control, high PLC automation program, and can also be remotely controlled by computer; it has reliable mechanical interlocking and electrical interlocking, accurate and flexible switch conversion, obvious on and off position indication, and padlock function, so as to realize the isolation reliability between power supply and load.

[0029] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An intelligent dual power automatic switching device, comprising a control unit, a normal power input unit and a standby power input unit, characterized in that: It also includes a power sampling unit, a switching unit and a power output unit; the output ends of the normal power input unit and the backup power input unit are each equipped with a power sampling unit; two switching units are provided, and the normal power input unit and the backup power input unit are respectively connected to the power output unit through two switching units; the control unit drives the switching unit to work, the switching unit has a switch state detection function, the switching unit transmits the switch state signal to the power sampling unit, and then the power sampling unit transmits the data to the control unit.

2. An intelligent dual power automatic switching device as claimed in claim 1, characterized in that: The power sampling unit adopts a multifunctional power meter, and collects data through MODBUS communication, and transmits the data to the control unit for processing and control.

3. The intelligent dual power automatic switching device according to claim 1, characterized in that: The control unit adopts PLC as the control core.

4. The intelligent dual power automatic switching device according to claim 1, characterized in that: The common power input unit and the backup power input unit both use a three-phase AC380V power supply, and the power output unit outputs a three-phase AC380V power supply.

5. The intelligent dual power automatic switching device according to claim 1 is characterized in that: The switching unit adopts a circuit breaker.

6. The intelligent dual power automatic switching device according to claim 3 is characterized in that: The PLC control module adopts S7-200 module.

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