CN209088564U - Direct current power supply system - Google Patents

Abstract

The utility model discloses a direct current power supply system, which comprises a direct current cabinet, which is characterized in that a charging and feeding screen and a battery screen are arranged on the direct current cabinet, and a charging module and a microcomputer are arranged on the charging and feeding screen. An intelligent monitoring device, the battery screen is arranged with a DC battery. The DC power supply system of the utility model has the functions of constant voltage, current limiting and floating charging, constant current, voltage limiting and equalizing charging, as well as a microcomputer management function, and the control mode has two independent units, automatic and manual, which is energy-saving and efficient.

Description

A DC power system

technical field

The utility model relates to the technical field of power supply systems, in particular to a direct current power supply system.

Background technique

The DC power supply system is mainly composed of battery packs, charging devices, DC feeder screens, DC power distribution cabinets, DC power monitoring devices, DC branch feeders, etc., and thus forms a huge and distributed DC power supply network for relay protection devices, Circuit breaker tripping and closing, signal system, DC charger, UPS, communication and other subsystems provide safe and reliable working power. With the advancement of technology, the DC operating power supply has undergone changes in phase-controlled rectifiers, nickel-separated battery DC screen-to-valve-regulated sealed lead-acid battery packs, high-frequency switching rectifier modules, and microcomputer monitoring technology. This technological progress has made the DC power supply system in my country's power industry updated and made a contribution to the automatic management of safe and reliable operation of the power grid. The current DC power system generally has the problem of insufficient energy saving and high efficiency.

Utility model content

The technical problem to be solved by the utility model is to provide a direct current power supply system, which is energy-saving and efficient.

The utility model adopts the following technical solutions to solve its technical problems:

A DC power supply system includes a DC cabinet, a charging and feeding screen and a battery screen are arranged on the DC cabinet, a charging module and a microcomputer intelligent monitoring device are arranged on the charging and feeding screen, and a DC battery is arranged on the battery screen.

Preferably, the charging and feeding screen is provided with three sides, and the battery screen is provided with two sides.

In this technical solution, the voltage of the DC power supply system is 220V, and the wiring mode of the DC power supply system is single bus segment wiring; the functions and functions of the microcomputer intelligent monitoring device include:

1. Monitor the output voltage, output current and AC input voltage of the charging module and various working states of the module. When the state changes or fails, it can actively send the data to the microcomputer intelligent monitoring device through the communication interface, and accept the microcomputer intelligent monitoring instructions for the device;

2. Perform patrol inspection on the operating parameters and working status of the DC power supply system, and collect and monitor the data of the charging module to ensure that it is charged according to the battery charging curve;

3. The microcomputer intelligent monitoring device is equipped with a liquid crystal display screen, which can display the operating status, parameters and abnormal alarm information of the DC power supply system.

Preferably, the charging and feeding screen is arranged with 4 charging modules and a set of microcomputer intelligent monitoring device, and the rated output current of the charging module is 12A.

Preferably, the microcomputer intelligent monitoring device adopts an RS485 communication interface. When the state changes or fails, the data can be sent to the unit DCS through the RS485 communication interface.

Preferably, the type of the DC battery is a valve-regulated sealed lead-acid battery; the capacity of the DC battery is 150Ah.

Preferably, the charging and feeding screen further includes: an AC input and switching unit, a monitoring unit, a rectifier module unit, a switch value detection unit, an insulation detection unit, and a battery inspection unit.

Preferably:

1. AC input and switching unit, with 2 channels of 380V AC input, can automatically switch between two channels;

2. The main functions and functions of the monitoring unit are as follows: 1) Complete the collection and processing of data, such as giving alarm information when the data is abnormal, and make corresponding control, such as limiting the current of the control module; 2) Passing the data through RS485 /CAN bus remote transmission to the background, such as power automation system; 3) Receive control commands from the background; 4) Receive various operation commands manually input, such as setting alarm lines, manual floating charge conversion, etc.;

3. The rectifier module unit integrates an anti-backflow diode inside the module, which can be hot-swapped and has the following multiple protection functions: 1) Input over/under voltage protection; 2) Output over voltage protection/under voltage alarm; 3) Short circuit retraction; 4) phase loss protection; 5) over temperature protection;

4. Switch quantity detection unit, its main functions are as follows: 1) Provide 40-way switch quantity state detection, including closing, control switch trip, battery switch trip, fuse fault, voltage drop unit fault, insulation fault and 2-way pre-conditioning. 2) Provide 7 channels of normally open passive contact output, which can be used as a classified alarm; 3) Data exchange with the main monitor through the RS485 bus; 4) If more than 40 channels of digital input, can be expanded to a maximum of 4 Switch value detection unit; 5) After installation, adjust the DIP switch and set the corresponding address.

5. The main functions of the insulation detection unit are as follows: 1) Each unit provides 30 branch circuit insulation resistance detection functions, and the measurement accuracy is ±0.3KΩ; 2) If the number of system loops exceeds 30, it can be expanded to 8 insulation detections at most Unit, that is, it can detect up to 240 insulation circuits; 3) Detect the ground voltage of the busbars (combining busbar, control busbar and busbar negative), and the measurement error is ±0.4V; Send the voltage value to ground and the information of resistance to ground to the main monitor; 5) The insulation resistance is judged by detecting the leakage current of the branch circuit, and it is not necessary to inject small AC signal on the branch circuit.

6. Battery inspection unit, its main functions are as follows: 1) Each unit can detect the voltage of up to 24 cells; 2) The system can detect up to 2 groups of 120 cells, that is, a system can be configured with up to 10 cells Detection unit; 3) It can detect 2V, 6V, 12V single cells respectively, and the measurement accuracy is 0.2%; 4) The detected single battery information is transmitted to the main monitor through the RS485 bus.

Compared with the prior art, the working principle and beneficial effects of the present utility model are:

1. It can fully meet the running state of constant voltage or constant current charging, floating charging and equalizing charging of the DC battery, and can automatically manage it;

2. It has the processing functions of stepless current limiting, battery temperature compensation, battery monitoring, abnormal operation of the DC power system and other abnormal situations, and can communicate with a single rectifier module, data acquisition unit, battery management device, insulation detection device and remote computer;

3. It has two independent units, automatic and manual. When the automatic control fails or is repaired, it can be transferred to manual control;

4. Through the monitoring unit, each power module has a monitoring function inside, which can independently complete the control and adjustment of the output voltage and current without relying on the microcomputer intelligent monitoring device, and has the function of protection and alarm, and can be plugged and unplugged under power. When working, the power module communicates with the microcomputer intelligent monitoring device and accepts its instructions.

In conclusion, compared with the prior art, the DC power supply system is more efficient and energy-saving.

Description of drawings

1 is a schematic diagram of the layout of the charging and feeding screen and the battery screen of the DC power supply system of the present invention;

FIG. 2 is a schematic diagram of the circuit structure of the DC power supply system of the present invention.

Description of reference numerals: charging and feeding screen 1; charging module 101; microcomputer intelligent monitoring device 102; AC input and switching unit 103; monitoring unit 104; rectifier module unit 105; Inspection unit 108; battery screen 2; DC battery 3.

Detailed ways

The present utility model will be further described and explained in detail below in conjunction with the accompanying drawings and implementation.

A DC power supply system includes a DC cabinet, a charging and feeding screen 1 and a battery screen 2 are arranged on the DC cabinet, and a charging module 101 and a microcomputer intelligent monitoring device 102 are arranged on the charging and feeding screen 1, and the battery screen 2 A DC battery 3 is arranged.

The charging and feeding screen 1 is provided with three sides, and the battery screen 2 is provided with two sides.

In this example, the voltage of the DC power supply system is 220V, and the wiring mode of the DC power supply system is single bus segment wiring; the functions and functions of the microcomputer intelligent monitoring device 2 include:

1. Monitor the output voltage, output current and AC input voltage of the charging module 1 and various working states of the module. When the state changes or fails, it can actively send the data to the microcomputer intelligent monitoring device 2 through the communication interface, and accept the microcomputer Instructions of the intelligent monitoring device 2;

2. Perform patrol inspection on the operating parameters and working status of the DC power supply system, and collect and monitor the data of the charging module 1 to ensure that it is charged according to the battery charging curve;

3. The microcomputer intelligent monitoring device 2 is equipped with a liquid crystal display screen, which can display the operating status, parameters and abnormal alarm information of the DC power supply system.

Specifically, the charging and feeding screen 1 is arranged with four charging modules 101 and one set of microcomputer intelligent monitoring device 102 , and the rated output current of the charging module 1 is 12A.

Specifically, the microcomputer intelligent monitoring device 102 adopts the RS485 communication interface. When the state changes or fails, the data can be sent to the unit DCS through the RS485 communication interface.

Specifically, the type of the DC battery 3 is a valve-regulated sealed lead-acid battery; the capacity of the DC battery 3 is 150 Ah.

Specifically, the charging and feeding screen 1 further includes: an AC input and switching unit 103 , a monitoring unit 104 , a rectifier module unit 105 , a switching value detection unit 106 , an insulation detection unit 107 , and a battery inspection unit 108 .

In this example:

1. AC input and switching unit 103, which is input by 2 channels of 380V AC, and can be automatically switched between two channels;

2. The main functions and functions of the monitoring unit 104 are as follows: 1) Complete the collection and processing of data, such as giving alarm information when the data is abnormal, and make corresponding control, such as limiting the current of the control module; 2) Passing the data through RS485/CAN bus is remotely transmitted to the background, such as power automation system; 3) Receive control commands sent from the background; 4) Receive various operation commands manually input, such as setting alarm lines, manual floating charge conversion, etc.;

3. The rectifier module unit 105 integrates an anti-backflow diode inside the module, which can be hot-swapped and has the following multiple protection functions: 1) Input over/under voltage protection; 2) Output over voltage protection/under voltage alarm; 3) Short circuit retraction; 4) Phase loss protection; 5) Over temperature protection;

4. The switch quantity detection unit 106, its main functions are as follows: 1) Provide 40-way switch quantity state detection, including closing, control switch tripping, battery switch tripping, fuse fault, step-down unit fault, insulation fault and 2 circuits Reserved branch; 2) Provide 7 normally open passive contact outputs, which can be used as classified alarms; 3) Data exchange with the main monitor through RS485 bus; 4) If there are more than 40 digital inputs, it can be expanded up to 4 5) After installation, adjust the DIP switch and set the corresponding address.

5. The main functions of the insulation detection unit 107 are as follows: 1) Each unit provides 30 branch insulation resistance detection functions, and the measurement accuracy is ±0.3KΩ; 2) If the number of system loops exceeds 30, it can be expanded to 8 insulation resistances at most Detecting unit, that is, it can detect up to 240 insulation circuits; 3) Detect the ground voltage of the busbar (combining bus, control bus and busbar negative), and the measurement error is ±0.4V; 4) Receive the upper and lower limits of the alarm sent by the main monitoring through the RS485 bus , and send the ground voltage value and ground resistance information to the main monitor; 5) The insulation resistance is judged by detecting the leakage current of the branch, without injecting a small AC signal on the branch.

6. The main functions of the battery inspection unit 108 are as follows: 1) Each unit can detect the voltage of up to 24 cells; 2) The system can detect up to 2 groups of 120 cells, that is, a system can be configured with a maximum of 10 cells Battery detection unit; 3) It can detect 2V, 6V, 12V single cells respectively, and the measurement accuracy is 0.2%; 4) The detected single battery information is transmitted to the main monitor through the RS485 bus.

The working principle and beneficial effects of this embodiment are:

1. It can fully meet the running state of constant voltage or constant current charging, floating charging and equalizing charging of the DC battery, and can automatically manage it;

2. It has the processing functions of stepless current limiting, battery temperature compensation, battery monitoring, abnormal operation of the DC power system and other abnormal situations, and can communicate with a single rectifier module, data acquisition unit, battery management device, insulation detection device and remote computer;

3. It has two independent units, automatic and manual. When the automatic control fails or is repaired, it can be transferred to manual control;

4. Through the monitoring unit, each power module has a monitoring function inside, which can independently complete the control and adjustment of the output voltage and current without relying on the microcomputer intelligent monitoring device, and has the function of protection and alarm, and can be plugged and unplugged under power. When working, the power module communicates with the microcomputer intelligent monitoring device and accepts its instructions.

In conclusion, compared with the prior art, the DC power supply system is more efficient and energy-saving.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims (3)

1. A DC power supply system, comprising a DC cabinet, characterized in that, a charging and feeding screen and a battery screen are arranged on the DC cabinet, and the charging and feeding screen is arranged with a charging module and a microcomputer intelligent monitoring device, and the battery screen is arranged with a charging module and a microcomputer intelligent monitoring device. DC batteries are arranged; the charging and feeding screen is provided with 3 sides, and the battery screen is provided with 2 sides; the charging and feeding screen is arranged with 4 charging modules and a set of microcomputer intelligent monitoring device, The rated output current is 12A; the type of the DC battery is a valve-regulated sealed lead-acid battery; the capacity of the DC battery is 150Ah. 2 . The DC power supply system according to claim 1 , wherein the microcomputer intelligent monitoring device adopts an RS485 communication interface. 3 . 3. The DC power supply system according to claim 1, wherein the charging and feeding screen further comprises: an AC input and switching unit, a monitoring unit, a rectifier module unit, a switching value detection unit, an insulation detection unit, Battery inspection unit.