CN102891529A - Automatic switching device of direct current dual power - Google Patents

Abstract

The invention proposes a direct current double power supply automatic switching device. The working mode switching switch is connected to the microprocessor, the charging voltage acquisition module is connected to the microprocessor, the communication port is connected to the microprocessor, the input contact is connected to the microprocessor in one direction, and the microprocessor is connected to the state indicator and the output contact. One-way connection, the microprocessor is one-way connected with the program-controlled circuit breaker through the drive module, and the state detector is one-way connected with the microprocessor and the program-controlled circuit breaker respectively. The device of the invention can switch DC dual power sources, and has the characteristics of good switching effect and safety. It is suitable for application as a DC dual power supply automatic switching device for electric equipment.

Description

A DC dual power supply automatic switching device

technical field

The invention proposes a DC dual power supply automatic switching device in the field of power supply appliances.

Background technique

As the power source of the substation, the DC system plays an extremely important role in the power supply system. In order to improve its safety and reliability, the original one-charge-one-storage mode has been gradually improved to two-charge-one-storage mode, in which one set of chargers is the normal power supply and the other set is the backup power supply. At present, when the "normal power supply" fails or needs to be repaired, the working mode of manually cutting off the normal power supply and then manually switching on the standby power supply is adopted. There is a time lag and a blind area, and the normal power supply output fails, but it cannot be found and Defects such as misoperation, for unattended substations, may cause major accidents because they cannot be dealt with in the first time when a fault occurs.

Unique problems in unattended substations: Due to the failure of the charger itself, it cannot detect its own output failure or fail to send failure information, signal transmission, remote communication, etc. Even when the normal power output fails, the remote monitoring equipment cannot get the alarm information ;Even if the remote monitoring equipment detects an alarm state, it is not discovered and processed due to human factors; it is impossible to rush to the scene to deal with it in the first place, and it takes a long time from the occurrence of the fault to the processing of the fault, especially when the fault occurs at night, burying a major safety hazard. There is monitoring blind area: When the normal power output fails due to various reasons, it cannot be discovered and dealt with in time.

Fault handling time lag: It often takes a long time from the occurrence of the fault to the fault being resolved; when the output of the charger fails, and the performance of the battery is seriously degraded, the maintenance time may be very short, and the time required for manual switching is relatively long . Waste of resources, low work efficiency: waste of manpower and time, and low work efficiency. Potential safety hazards caused by human factors: The equipment has an alarm, but it is not discovered and dealt with in time; due to the negligence of the staff, it may lead to problems of missed, wrong, and simultaneous casting.

Contents of the invention

In order to realize automatic switching of DC dual power sources, the present invention proposes an automatic switching device for DC dual power sources. The device is connected with functional components through a microprocessor to solve the technical problem of automatic switching of DC dual power sources.

The solution adopted by the present invention to solve the technical problem is: the working mode switching switch is connected to the microprocessor, the charging voltage acquisition module is connected to the microprocessor, the communication port is connected to the microprocessor, and the input contact is connected to the microprocessor in one direction. , the microprocessor is unidirectionally connected to the state indication and output contacts, the microprocessor is unidirectionally connected to the program-controlled circuit breaker through the driving module, and the state detector is unidirectionally connected to the microprocessor and the program-controlled circuit breaker respectively.

The positive effect is that the device of the invention can switch between DC dual power sources, and has the characteristics of good switching effect and safety. It is suitable for application as a DC dual power supply automatic switching device for electric equipment. the

Description of drawings

Fig. 1 is a structural diagram of the switching device of the present invention

Detailed ways

The working mode switching switch is connected to the microprocessor, the charging voltage acquisition module is connected to the microprocessor, the communication port is connected to the microprocessor, the input contact is connected to the microprocessor in one direction, and the microprocessor is connected to the state indicator and the output contact. One-way connection, the microprocessor is one-way connected with the program-controlled circuit breaker through the drive module, and the state detector is one-way connected with the microprocessor and the program-controlled circuit breaker respectively.

Working process of the present invention:

Programmable circuit breaker + control module mode:

The program-controlled circuit breaker is used as the opening and closing mechanism of the main circuit, and the microprocessor is used to collect the output voltage/current of the charger, and the communication port and contact input and output ports are reserved. The opening and closing of the circuit breaker is controlled through the drive module, and the mechanical interlocking method is adopted. Guarantee its operational reliability.

Features: directly collect the state of the output terminal of the charger without interference from external factors, ensuring the authenticity of the information and the rapidity of the action; using high-performance program-controlled circuit breakers, electromagnetic mechanical switch opening and closing, high reliability and safety; time delay Time: It depends on the detection time of DC vector voltage/current. To detect DC vector voltage/current, it is necessary to judge the voltage change process and perform filtering to avoid misjudgment. The mechanical action time of the program-controlled circuit breaker generally takes a few seconds.

Collection method 1: In order to accurately collect the output voltage of the charger without being affected by the voltage of the bus or battery pack, a high-power diode needs to be connected in series, which will cause a voltage drop between the output voltage of the charger and the voltage of the bus, generally about 1V , therefore, the output voltage of the charger should be adjusted to the bus voltage +1V;

Collection method 2: No diodes are connected in series, through voltage drop, when the output of the charger fails, the voltage at the output terminal of the charger = the voltage of the battery pack, therefore, the voltage drop = floating charge voltage/equal charge voltage - battery pack voltage.

Judgment of charger output current:

Under normal circumstances, the load current of the equipment is provided by the charger, and the electromagnetic closing mechanism needs to be provided by both the charger and the battery pack. Therefore, it is judged whether there is a fault by collecting the output current of the charger.

Charger output fault judgment: The device reserves an input interface and a communication interface, which can be connected to the fault output contact/communication port of the charger as a basis for fault judgment. The device reserves a remote control interface, and the switching status can be remotely controlled through the background.

When carrying out the withstand voltage test, the control module must be disconnected from the main circuit to avoid damage to the controller. Because the DC dual power supply automatic switching device controls the switching state between the DC output of the two chargers and the busbar, both the normal power supply and the backup power supply need to be powered on and are in a hot backup state.

The DC dual power supply automatic switching device has the following functions:

It has three modes of automatic, manual and full shutdown:

Automatic mode: According to the set current vector voltage/current lower limit, the input charger fault output contact information and the remote control command received by the communication port, it will automatically switch after the set delay time;

Manual mode: manually operate the switching status of the normal power supply and the backup power supply;

Full shutdown mode: cut off all the normal power supply and backup power supply, and exit the operation.

Input information: as the judgment condition for switching in automatic mode.

Charger output failure: automatic collection inside the device.

Contact input interface: It can be connected to the fault state output contact of the charger or the remote control contact. Communication port: It can be connected to the charger to receive the fault information of the charger; or connected to other host computers to receive remote control commands.

Output information: output the current working status of the device and other information such as alarm information.

Communication port: It can be connected with upper computer and other equipment for information transmission and remote control. Contact input interface: Provide passive contact output for collection by other devices. the

Claims (1)

1. direct-current dual power automatic switching control equipment, it is characterized in that: the mode of operation diverter switch is connected with microprocessor, charging voltage acquisition module and microprocessor interconnect, PORT COM and microprocessor interconnect, the input contact is connected with microprocessor is unidirectional, the indication of microprocessor and state is connected with output contact and is connected, and microprocessor is connected with program control circuit breaker is unidirectional by driver module, state detector respectively with microprocessor be connected that circuit breaker is unidirectional to be connected.

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