Equipment Overview

The distribution management system can simulate the control and protection of the excess power supply channel of the XX system by the DC busbar on the computer, and detect the power consumption status of multiple channels in real time, which is displayed on the distribution control software interface.

The disconnection and switching box can achieve manual disconnection, automatic on/off, physical simulation switching of signals, and the introduction of signal monitoring and acquisition points. The overall implementation is achieved through a combination of modules and wiring. Unified integration of the above functions into a 2U chassis, supporting on-demand processing of up to 100 signals. The specific external structure is shown in the following figure.

Figure 1 Front view of disconnected switching box

The disconnection switching box adopts a standard shelving mechanism design, with a box height of 2U, width of 430mm, depth of 450mm, and an overall color of black. It is necessary to ensure consistency in the size of the chassis, ensure mechanical strength, and be able to support the stacking and placement of multiple chassis. The front panel of the chassis is printed with product identification patterns or logos. The front panel is configured with disconnect blocks, necessary indicator lights, and reset buttons.

Module design

The disconnection and switching module adopts DC28V power supply with insurance protection function, which can achieve remote network control. The IP is configured through software, and the working status of the module and network control can be monitored through the front panel. The module can be reset through the front panel.

Figure 2 Module schematic diagram

Explanation: The yellow part represents the signal on/off control relay; The green part represents the signal simulation switching relay;

The module is connected to the front and rear panels through three DB78 connectors, and the external network interface and status indicator terminals of the module are respectively connected to the front panel indicator light and the rear panel network port. The external power supply and shell ground of the two modules are connected together and connected to the rear panel.

Front panel design

Install 10 sets of disconnection blocks on the front panel to achieve disconnection and manual detection of up to 100 differential signals; The schematic diagram of the front panel is as follows:

Figure 3 Front panel of the chassis

In addition to installing disconnection blocks, the front panel is equipped with reset buttons and power, network status, and other indicator lights for the relay board to facilitate personnel resetting the IP settings of the relay board, and to real-time understand the network communication status of the internal relay module. Convenient fault location and troubleshooting. At the same time, three color indicator lights are provided to display the specific status of each channel, including physical/simulation/open circuit. Please note that the brightness of the indicator light is soft and not harsh, and the reset button should be embedded under the panel to prevent accidental touch.

Rear panel design

The interface between the rear panel implementation module and the measured signal. Connect signals from other modules to the rear panel through connectors (the actual number of converted signals is 66). Each module is equipped with aviation or rectangular plugs, with the upper and lower rows of plugs arranged in an empty manner to leave enough space for convenient plug insertion and removal operations.

Install two control interfaces (Ethernet) for the relay board on the rear panel, one power interface for the relay board, and one shielding ground interface.

Module installation method

The module is fixed with front panel earrings and is no longer equipped with a dedicated bracket due to installation space limitations. In order to ensure the installation of the module is firm and consider the beautiful cable routing, the connecting cables on the rear panel of the module should be orderly fixed on the cabinet, and a dedicated cable fixing bracket can be considered.

Other requirements

The disconnection and switching box is a 19 inch standard 2U rack mounted chassis. The front and rear panels and side panels of the chassis need to be made of 6063-T5 extruded aluminum alloy profiles, and the upper and lower cover plates can be made of 5052-H32 aluminum plates. To ensure a certain stacking height of the chassis inside the cabinet and maintain the accuracy of the U-hole, the entire surface of the chassis is made of black anodized, and the thickness of the oxide layer is not less than 10 μ m. The color needs to be consistent with the cabinet. To ensure that the text and icon content on the front and rear panels are clear and do not fall off, UV printing is required, and the entire chassis needs to be clean and aesthetically pleasing. The front panel of the chassis adopts an integrated design, and there are no fixed screws on the panel. There are handles on both sides of the front panel with a spacing of 50mm, which facilitate the disassembly and installation of the chassis. The size diagram of the chassis is shown in the following figure. In terms of electrical performance, the insulation resistance between different channels in the disconnection and switching box should be greater than 40M Ω under DC 500V test voltage.

Figure 4 Overall dimensions of the disconnection and switching box