Intelligent low-voltage drawer feed unit

Abstract

An intelligent low-voltage drawer feed unit is characterized in that the intelligent low-voltage drawer feed unit comprises a drawer, and a circuit system is arranged in the drawer; the circuit breaker QF receives the mains supply and is further provided with a terminal S1, a terminal S2 and a terminal S4, the terminal S1 is connected with the first end of a manual switch SA, the second end of the manual switch SA is connected with the terminal S2 through a switch SB1, and the second end of the manual switch SA is further connected with the terminal S4 through a switch SB2; the third end of the manual switch SA is connected with the common connection point of the end point S1 and the end point S4, and the fourth end of the manual switch SA is connected with the end point S2 and the end point S4 through the multifunctional meter PD. The switch cabinet can be operated on site beside the switch cabinet, electric closing and opening are achieved by pressing a button, a manual rotating handle is omitted, and manpower is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to low pressure drawer field especially relates to an intelligent low pressure drawer feeding unit. BACKGROUND

[0002] Generally, there are multiple low voltage complete switch devices in the power transformation and distribution station, which are called low voltage switch cabinets. There are multiple types of low voltage switch cabinets, and the mainstream low voltage switch cabinet is currently in the drawer type. A drawer type switch cabinet has multiple drawer type feeding units, and a molded case circuit breaker is installed in the drawer type feeding unit as a main switch element of the electric load to control the on-off and operation protection of the load. Some drawer units are also equipped with current transformers and ammeters or multifunctional meters to monitor and display the operating parameters of the load. The control of the molded case circuit breaker is generally manual, that is, the on-off of the switch is controlled by rotating the rotating handle on the door of the drawer unit.

[0003] The existing technology has the following disadvantages: first, the on-off of the switch is controlled by rotating the rotating handle on the door of the drawer unit, which is a bit laborious. For small current switches with a rated current of 250A or less, the required force is relatively small, while for large current switches with a rated current of 400A-630A, the required force is relatively large. Second, if the large current load trips due to a fault, the operator may not be aware and forcibly rotate the handle to close the switch, which may cause an accident and lead to an explosion of the switch, which may affect the personal safety of the operator. Third, the on-off of the switch cannot be remotely controlled, and the on-off state of the switch cannot be remotely obtained. Fourth, the real-time electrical parameters of the controlled load, such as the current, voltage, power, power consumption, and heating temperature of the switch contacts, cannot be remotely obtained. Moreover, the real-time parameters cannot be used to provide early warning information, and the historical records and fault records of the electrical parameters cannot be remotely saved and queried. CONTENT OF THE UTILITY MODEL

[0004] To solve the above problems, the technical scheme provides an intelligent low voltage drawer feeding unit.

[0005] To achieve the above purpose, the technical scheme is as follows:

[0006] An intelligent low voltage drawer feeding unit, characterized by comprising a drawer, the drawer is provided with a circuit system, which comprises:

[0007] A circuit breaker QF receives the mains, and is further provided with a terminal S1, a terminal S2, and a terminal S4. The terminal S1 is connected with a first end of a manual switch SA, a second end of the manual switch SA is connected with the terminal S2 through a switch SB1, and the second end of the manual switch SA is further connected with the terminal S4 through a switch SB2.

[0008] The third terminal of the manual switch SA is connected to the common contact point of endpoints S1 and S4, and the fourth terminal of the manual switch SA is connected to endpoints S2 and S4 respectively through the multifunction meter PD.

[0009] In some embodiments, a limit switch SP1 is also included, which is connected between the third terminal and the terminal S4.

[0010] In some embodiments, the normally closed terminal of the circuit breaker QF is connected to an indicator light HG.

[0011] In some embodiments, the normally open terminal of the circuit breaker QF is connected to an indicator light HR.

[0012] In some embodiments, a temperature warning data collector WK is also included, which collects the temperature and transmits it wirelessly to a receiver, and is connected to a buzzer PB.

[0013] The beneficial effects of this application are:

[0014] This application allows for on-site operation next to the switchgear, but uses push-button electric closing and opening, eliminating the need for manual rotary handles and saving manpower (the electric operating mechanism itself retains manual operation functionality). Secondly, the switch can be electrically closed and opened remotely via the internet, saving manpower and ensuring operator safety. Thirdly, the operating data of the drawer-type power supply unit is uploaded to the cloud, allowing users to query real-time electrical parameters of the load, switch contact temperature information, fault warning information, and analyze power quality via internet on a computer or mobile client. Historical data stored in the cloud can also be accessed.

[0015] Objective: To enable drawer-type power supply units to have multiple control modes, including local, remote, manual, and electric control, and to connect the drawer unit to the power cloud, thereby enabling remote monitoring of power parameters and contact temperature, and improving the safety and intelligent management level of switchgear. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the circuit structure of an embodiment of the present utility model;

[0018] Figure 2 This is a reference diagram of a drawer according to an embodiment of the present utility model. Figure 1 ;

[0019] Figure 3 This is a reference diagram of a drawer according to an embodiment of the present utility model. Figure 2 . Detailed Implementation

[0020] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] Please refer to Figures 1-3 As shown, an intelligent low-voltage drawer power supply unit includes a drawer, and the drawer is equipped with a circuit system, which includes:

[0022] The circuit breaker QF receives mains power and is provided with terminals S1, S2 and S4. Terminal S1 is connected to the first end of manual switch SA. The second end of manual switch SA is connected to terminal S2 through switch SB1. The second end of manual switch SA is also connected to terminal S4 through switch SB2.

[0023] The third terminal of the manual switch SA is connected to the common contact point of endpoints S1 and S4, and the fourth terminal of the manual switch SA is connected to endpoints S2 and S4 respectively through the multifunction meter PD.

[0024] In this embodiment, a limit switch SP1 is also included, which is connected between the third terminal and the terminal S4.

[0025] In this embodiment, the normally closed terminal of the circuit breaker QF is connected to an indicator light HG.

[0026] In this embodiment, the normally open terminal of the circuit breaker QF is connected to an indicator light HR.

[0027] In this embodiment, a temperature warning data collector WK is also included, which collects the temperature of 6 points in the main circuit plug-in and transmits it wirelessly to the receiver. It is connected to a buzzer PB.

[0028] Figures 2-3This is a schematic diagram of a drawer. Specifically, a standard drawer unit shell is made of aluminum-zinc coated sheet. The drawer unit consists of a bottom plate, left and right side plates, a back plate, and a front door. The drawer's dimensions are determined by the rated current and size of the internal molded case switch. A drawer-pull positioning mechanism is installed at the front of the drawer bottom plate, with a drawer unlock limit switch and a drawer limit switch mounted on it. The rear of the drawer unit has primary inlet and outlet wiring connectors for drawing power from the main busbar of the switch cabinet and for power output. The front of the drawer unit has a door connected to the left side panel of the drawer via hinges. The drawer door is made of cold-rolled steel sheet and coated with anti-corrosion paint. The door is equipped with a selector switch, buttons, and indicator lights for switch opening / closing control, status display, and remote / local operation selection. A multi-functional instrument is also installed on the door to monitor and display circuit voltage, current, power, and other electrical parameters; a buzzer is also installed to sound an alarm when the temperature of the conductive parts at the drawer inlet / outlet wiring connector exceeds the limit.

[0029] A plastic-cased switch is installed in the middle of the drawer. An electric operating mechanism is installed on the front of the plastic-cased switch. The switch's inlet is connected to the rear inlet plug via a wire or copper busbar. The switch's outlet is connected to the outlet plug via a wire or copper busbar passing through three current transformers. At the conductive parts where the inlet and outlet wires or copper busbars connect to the primary plug, a temperature sensor is fitted with a high-temperature resistant nylon cable tie, for a total of six sensors. A temperature warning data acquisition device and a secondary control fuse are installed on the right side panel of the drawer.

[0030] refer to Figure 1 In the diagram, QF represents a molded case circuit breaker, which has two open and two closed auxiliary contacts. The opening and closing operations are achieved through an electric operating mechanism. The changeover switch SA has three positions, and different control modes are selected by rotating the handle.

[0031] 1) When the handle is turned to the left, it is in the local position, which means that the molded case switch can be controlled locally on the drawer unit door. At this time, the molded case switch can be opened or closed by pressing the SB1 and SB2 buttons on the door;

[0032] 2) When the handle is turned to the middle, it is in the 0 position, which is the stop position. The molded case switch remains in the closed or open position. Neither local nor remote operation has any effect.

[0033] 3) Turning the handle to the right is the remote control position, which means operating it through the network. The power cloud platform in the cloud sends closing and opening commands, and executes the closing and opening control of the molded case switch through the switch output dry contacts D01, D02, D03, and D04 of the multi-function meter.

[0034] 4) When the switch is in the open position, the HG green light is on; when the switch is in the closed position, the HR red light is on.

[0035] 5) In the diagram, SP at the power control point is the position limit switch on the drawer push mechanism. As the drawer unit is pushed in and pulled out (manual operation), and cranked in and out (handle operation), the drawer has three positions: working position, test position, and disconnected position. Ensure that the power supply to the drawer is uninterrupted when the drawer is in the working position and test position.

[0036] 6) In the diagram, SP1 is the unlock switch on the drawer push mechanism. Under normal conditions, the drawer is locked in the working or test position. Pressing the unlock button on the drawer handle unlocks the drawer, allowing it to be pushed in and pulled out. Simultaneously, the SP1 switch activates, tripping the molded case switch to ensure the drawer is not loaded when it is moved in or out.

[0037] 7) In the diagram, WK is the temperature alarm data acquisition unit, which is wired to the six temperature probes at the drawer inlet / outlet terminals and wirelessly connected to a receiver mounted outside the drawer. One receiver can receive signals from approximately 100 data acquisition units. When the temperature exceeds the set limit, the passive dry contacts D1 and D2 of the data acquisition unit activate, and the PB buzzer sounds an alarm. The activation signal from the data acquisition unit can also be connected to the electric operating mechanism of the molded case switch or the shunt coil attached to the molded case switch, causing the molded case switch to trip.

[0038] 8) In the diagram, PD is a multifunction meter used to collect electrical parameters such as current and voltage of the electrical load. The multifunction display screen can show real-time electrical parameters. The multifunction meter also has switch input interfaces DI1 and DI2 for receiving switch closing / opening status signals and fault alarm signals; switch output interfaces D01, D02, D03, and D04 are used for remote closing / opening operations of the switch.

[0039] 9) Both the multi-function meter and the temperature receiver are equipped with a 485 communication interface, which is connected to the communication gateway in the cabinet via a shielded twisted pair cable. The gateway has a built-in 4G / 5G communication module. By inserting an IoT card, it can communicate with the cloud power platform to obtain real-time power consumption parameters of the load and perform remote operation and intelligent management of the power load.

[0040] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. An intelligent low-voltage drawer power supply unit, characterized in that, Includes a drawer, the drawer containing an electrical system, which includes; The circuit breaker QF receives mains power and is provided with terminals S1, S2 and S4. Terminal S1 is connected to the first end of manual switch SA. The second end of manual switch SA is connected to terminal S2 through switch SB1. The second end of manual switch SA is also connected to terminal S4 through switch SB2. The third terminal of the manual switch SA is connected to the common contact point of endpoints S1 and S4, and the fourth terminal of the manual switch SA is connected to endpoints S2 and S4 respectively through the multifunction meter PD.

2. The intelligent low-voltage drawer power supply unit according to claim 1, characterized in that: It also includes a limit switch SP1, which is connected between the third terminal and the terminal S4.

3. The intelligent low-voltage drawer power supply unit according to claim 2, characterized in that: The normally closed terminal of the circuit breaker QF is connected to an indicator light HG.

4. The intelligent low-voltage drawer power supply unit according to claim 1, characterized in that: The normally open terminal of the circuit breaker QF is connected to an indicator light HR.

5. The intelligent low-voltage drawer power supply unit according to claim 1, characterized in that: It also includes a temperature warning data collector WK, which collects temperature data and transmits it wirelessly to a receiver, and is connected to a buzzer PB.

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