Power supply device
The power supply device, consisting of a control box, an AC current transmitter, and a current transformer, monitors the current and cuts off the circuit in case of a fault, thus solving the problem of power outages when multiple transformers are connected in parallel and achieving stable and safe operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG HANGXIN TECH CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-17
AI Technical Summary
When multiple transformers are operating in parallel, a faulty transformer tripping can cause other transformers to overload and trip, resulting in a complete power outage of the equipment.
The power supply device, consisting of a control box, an AC current transmitter, and a current transformer, monitors the current and sends a trip command to the circuit breaker when a fault occurs, cutting off the circuit to protect the transformer and ensure the continuous operation of important equipment.
It effectively reduces transformer load, prevents equipment power outages, and ensures the stability and safety of equipment operation.
Smart Images
Figure CN224138724U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power supply technology, and in particular to a power supply device. Background Technology
[0002] Currently, high-voltage outgoing switchgear has overload, over-temperature, and heavy gas tripping functions, while low-voltage incoming switchgear has overload and undervoltage tripping functions. When two or more transformers are running in parallel, regardless of the reason for the trip, the load before the high-voltage and low-voltage circuit breakers of the faulty transformer are disconnected will be transferred to other transformers, eventually causing other transformers to overload and trip, resulting in a power outage for all equipment. Utility Model Content
[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a power supply device.
[0004] This application provides the following technical solution: a power supply device, comprising:
[0005] Control box;
[0006] Multiple circuit breakers, each circuit breaker having a signal interface terminal electrically connected to the control box, the circuit breakers being used to connect to a transformer or a low-voltage load;
[0007] An AC current transmitter is electrically connected to the control box, and the AC current transmitter is connected to the circuit breaker through the signal interface terminal.
[0008] A current transformer, which is connected to the AC current transmitter.
[0009] In some embodiments, the AC current transmitter includes at least one first AC current transmitter and at least one second AC current transmitter, wherein the first AC current transmitter is connected to the first circuit breaker and the second AC current transmitter is connected to the third circuit breaker.
[0010] In some embodiments, the plurality of circuit breakers includes at least one first circuit breaker, at least one second circuit breaker, and at least one third circuit breaker;
[0011] The first circuit breaker has a first signal interface terminal, the second circuit breaker has a second signal interface terminal, and the third circuit breaker has a third signal interface terminal;
[0012] The first signal interface terminal, the second signal interface terminal, and the third signal interface terminal are respectively electrically connected to the control box;
[0013] When the closing signal of the first circuit breaker and / or the second circuit breaker is lost, and the sum of the currents collected by the control box through the first AC current transmitter is greater than the preset allowable current of the remaining operating transformer, the control box sends a tripping signal to the third circuit breaker through the third signal interface terminal.
[0014] In some embodiments, the current transformer includes a first current transformer and a second current transformer, wherein the first current transformer is connected to the first AC current transmitter and the second current transformer is connected to the second AC current transmitter.
[0015] In some embodiments, the control box includes a controller and a power supply, the controller being connected to the power supply.
[0016] In some embodiments, a touch screen is provided on one side of the control box, and the touch screen is electrically connected to the controller.
[0017] In some embodiments, the power supply device further includes an alarm that is electrically connected to the controller to control the alarm to start or stop via the controller.
[0018] In some embodiments, the power supply device includes a signal light connected to the controller.
[0019] In some embodiments, the controller has an indicator button on one side, the indicator button having an indicator light, the indicator light having at least a constant on state, a flashing state, and an off state.
[0020] In some embodiments, a reset button is provided on one side of the controller.
[0021] The embodiments of this application have the following advantages: the large current / high voltage on the primary side is converted into a small signal by a current transformer, and further converted into a standard signal by a transmitter, which is convenient for the control box to collect. The control box analyzes and judges the collected current, and sends a control command (opening command or closing command) to the circuit breaker according to the judgment result. The opening command is transmitted to the trip coil of the circuit breaker through the signal interface terminal, and the circuit breaker performs the opening and cuts off the circuit to protect the transformer, thereby reducing the transformer load and ensuring the continuous operation of important equipment.
[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This diagram shows a structural schematic from a first perspective of a power supply device according to some embodiments of the present invention;
[0025] Figure 2 The diagram shows a second embodiment of a power supply device provided by some embodiments of the present invention, with a structural schematic diagram from one perspective.
[0026] Explanation of key component symbols:
[0027] 100-Control box; 200-Circuit breaker; 300-AC current transmitter; 400-Current transformer; 210-First circuit breaker; 220-Second circuit breaker; 230-Third circuit breaker; 211-First signal interface terminal; 221-Second signal interface terminal; 231-Third signal interface terminal; 310-First AC current transmitter; 320-Second AC current transmitter; 410-First current transformer; 420-Second current transformer; 110-Touch screen; 120-Controller; 500-Alarm; 600-Indicator light; 700-Indicator button. Detailed Implementation
[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0029] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0033] like Figure 1 As shown, some embodiments of this application provide a power supply device, which is mainly used to avoid the situation where the failure of at least one of the multiple transformers operating in parallel causes the remaining transformers to be overloaded and result in a power outage, so as to ensure the stability of the power supply to the equipment and thus protect the stability and safety of the equipment operation.
[0034] The power supply unit includes a control box 100, an AC current transmitter 300, a current transformer 400, and multiple circuit breakers 200.
[0035] An AC current transmitter is an industrial automation device that converts AC current signals into standard signals. It is mainly used for monitoring, controlling, or transmitting AC current data.
[0036] Current transformer 400 (CT) is a key device in power systems used for current measurement, protection and control. Its function is to convert large currents into small currents (usually 5A or 1A) proportionally so that secondary equipment such as instruments and relays can be used safely.
[0037] In this embodiment, the control box 100 can monitor, protect, control, and communicate to ensure the safe and stable operation of the transformer and realize intelligent management. The control box 100 can collect data such as voltage, current, power, frequency, and power factor of the transformer input / output in real time.
[0038] The number of circuit breakers 200 can be any number of two or more values, and can be set according to the actual situation.
[0039] It should be noted that the circuit breaker 200 has a signal interface terminal, which is mainly used to realize the functions of status monitoring, remote control, fault alarm and system linkage. At the same time, the circuit breaker 200 can monitor and report the opening or closing status through the signal interface terminal. In addition, when the circuit breaker 200 trips due to faults such as overload or short circuit, the signal interface terminal can also trigger the alarm contact. The signal interface terminal can also realize remote operation by receiving external signals (such as instructions from DCS or remote control center).
[0040] In this embodiment, the signal interface is electrically connected to the control box 100. The circuit breaker 200 is used to connect to the transformer or low-voltage load so that the control box 100 can monitor the current output by the transformer. When the total current is greater than the remaining transformer allowable current value, the control box 100 issues a trip command. The trip command is transmitted to the trip coil of the circuit breaker 200 through the signal interface. The circuit breaker 200 performs the trip and disconnects the circuit to protect the transformer. At the same time, a "tripped" signal is fed back to the control box 100 through the signal interface. The control box 100 records the fault event and uploads it to the system through the communication interface.
[0041] The AC current transmitter 300 is electrically connected to the control box 100 to convert the transformer's current / voltage into a standard signal (such as 4-20mA) and input it into the analog signal acquisition module of the control box 100 for overload detection.
[0042] The AC current transmitter 300 is connected to the circuit breaker 200 through the signal interface terminal;
[0043] The current transformer 400 is connected to the AC current transmitter 300 to convert the large current / high voltage on the primary side into a small signal (e.g., CT output 0-5A, PT output 0-100V) through the current transformer 400 (CT / PT). The transmitter further converts it into a standard signal (e.g., 4-20mA, 0-10V) for easy acquisition by the control box 100. The control box 100 analyzes and judges the acquired current and sends a control command (opening command or closing command) to the circuit breaker 200 based on the judgment result. The opening command is transmitted to the trip coil of the circuit breaker 200 through the signal interface terminal, and the circuit breaker 200 performs the opening and cuts off the circuit to protect the transformer, thereby reducing the transformer load and ensuring the continuous operation of important equipment.
[0044] like Figure 1 and Figure 2As shown, in some embodiments of this application, the plurality of circuit breakers 200 includes at least one first circuit breaker 210, at least one second circuit breaker 220 and at least one third circuit breaker 230.
[0045] It is understandable that the number of the first circuit breaker 210, the second circuit breaker 220 and the third circuit breaker 230 can be any number of one, two or more, depending on the actual situation.
[0046] In this embodiment, the first circuit breaker 210 is a universal circuit breaker for low-voltage incoming line cabinets, the second circuit breaker 220 is a vacuum circuit breaker for high-voltage outgoing line cabinets, and the third circuit breaker 230 is a universal circuit breaker for low-voltage outgoing line cabinets.
[0047] Among them, the universal circuit breaker in the low-voltage incoming cabinet (also known as a frame circuit breaker or air circuit breaker) is the core protection equipment of the low-voltage power distribution system (such as 400V, 690V), mainly used for power supply switching, load protection, and short-circuit protection at the incoming end. The vacuum circuit breaker in the high-voltage outgoing cabinet is a key device in the power system used to control and protect high-voltage circuits, mainly used in 10kV~35kV power distribution systems. The universal circuit breaker in the low-voltage outgoing cabinet is mainly used for branch circuit protection in the power distribution system, responsible for controlling and protecting motors, power lines, or load equipment to prevent overload, short circuit, and other faults. Compared with the incoming cabinet circuit breaker, the outgoing cabinet circuit breaker usually has a smaller current rating, but it needs to be coordinated with the upstream circuit breaker to achieve selective protection.
[0048] like Figure 2 As shown, in some embodiments of this application, the AC current transmitter 300 includes at least one first AC current transmitter 310 and at least one second AC current transmitter 320, the first AC current transmitter 310 being connected to the first circuit breaker 210, and the second AC current transmitter 320 being connected to the third circuit breaker 230.
[0049] The number of first AC current transmitters 310 is equal to the number of first circuit breakers 210, and the number of second AC current transmitters 320 is equal to the number of third circuit breakers 230.
[0050] like Figure 2 As shown, in some embodiments of this application, the first circuit breaker 210 has a first signal interface terminal 211, the second circuit breaker 220 has a second signal interface terminal 221, and the third circuit breaker 230 has a third signal interface terminal 231.
[0051] In addition, the first signal interface terminal 211, the second signal interface terminal 221, and the third signal interface terminal 231 are electrically connected to the control box 100, and the control box 100 collects the closing signals of the first signal interface terminal 211, the second signal interface terminal 221, and the third signal interface terminal 231, and simultaneously collects the current flowing through the current transformer 400. When the closing signal of the first circuit breaker 210 and / or the second circuit breaker 220 is lost, and the sum of the currents collected by the control box 100 through the first AC current transmitter 310 is greater than the preset allowable current for the remaining operation of the transformer, the control box 100 sends a tripping signal to the third circuit breaker 230 through the third signal interface terminal 231, so as to reduce the load and ensure the continuous operation of important equipment.
[0052] In this embodiment, the importance of the devices connected by the first circuit breaker 210, the second circuit breaker 220, and the third circuit breaker 230 is classified as follows: the devices connected by the first circuit breaker 210 are more important than the devices connected by the second circuit breaker 220, and the devices connected by the second circuit breaker 220 are more important than the devices connected by the third circuit breaker 230.
[0053] By setting up a first circuit breaker 210, a second circuit breaker 220, and a third circuit breaker 230 to connect to different equipment via transformers, the importance of the equipment can be distinguished. In the event of a fault in one of the transformers, the third circuit breaker 230 can disconnect non-critical equipment, thereby ensuring that a fault in one transformer does not cause other transformers to overload and ultimately lead to a complete power outage of the equipment.
[0054] like Figure 2 As shown, in some embodiments of this application, the current transformer 400 includes a first current transformer 410 and a second current transformer 420, the first current transformer 410 being connected to the first AC current transmitter 310, and the second current transformer 420 being connected to the second AC current transmitter 320.
[0055] It should be noted that the number of the first current transformer 410 is equal to the number of the first AC current transmitter 310, and the number of the second current transformer 420 is equal to the number of the second AC current transmitter 320.
[0056] In this embodiment, by connecting the second AC current transmitter 320 to the third circuit breaker 230, the second AC current transmitter 320 collects the current magnitude of the second current transformer 420 on the outlet copper busbar of the third circuit breaker 230 in real time. This allows the control box 100 to calculate in advance the possible failure of one or more equipment, and the number of non-critical loads that will be cut off if the allowable current is exceeded. Once the controller 120 detects the loss of the closing signal of one of the first circuit breakers 210 or the second circuit breaker 220, and the allowable current is exceeded, the controller 120 sends a trip signal to the third circuit breaker 230, thereby making the number of non-critical loads cut off more accurate.
[0057] It should be noted that even if the controller 120 does not detect the loss of the closing signal of one of the first circuit breakers 210 or the second circuit breaker 220, but the over-permissible current is met, the controller 120 sends a trip signal to the third circuit breaker 230 to cut off the minimum number of non-critical loads that reduce the allowable current of the transformer.
[0058] like Figure 1 and Figure 2 As shown, in some embodiments of this application, the control box 100 includes a controller 120 and a power supply, wherein the controller 120 is connected to the power supply.
[0059] In this embodiment, the power source is an uninterruptible power supply (UPS), which is a power protection device that can provide continuous and stable power to the load through a built-in battery or energy storage device when the mains power is abnormal (such as power outage, voltage fluctuation, frequency instability, etc.), ensuring uninterrupted operation of the equipment.
[0060] By setting the power supply to an uninterruptible power supply, the control box 100 can continue to be powered after a power outage, allowing operators to view the monitoring data before the power outage.
[0061] like Figure 2 As shown, in some embodiments of this application, a touch screen 110 is provided on one side of the control box 100. The touch screen 110 is electrically connected to the controller 120. The touch screen 110 can display the fault trip location, fault time, maximum current before tripping, and current data after actively disconnecting non-critical equipment recorded by the controller 120, so as to facilitate the staff to make judgments and carry out subsequent work.
[0062] like Figure 1 and Figure 2 As shown, in some embodiments of this application, the power supply device further includes an alarm 500, which is electrically connected to the controller 120 to control the activation or deactivation of the alarm 500 via the controller 120.
[0063] In some embodiments, the control box analyzes current data in real time. When the control box determines that the closing signal of the first circuit breaker 210 or the second circuit breaker 220 is lost, and the total current is greater than the allowable current value of the remaining transformer, it immediately sends a trip signal to the third circuit breaker 230 through the third signal interface terminal 231. At the same time, the alarm 500 issues an audible and visual alarm to reduce the load and ensure the continuous operation of important equipment.
[0064] Among them, the alarm 500 can be at least one of the following: a buzzer, a voice alarm, and an alarm light, and can be specifically set according to the actual situation.
[0065] In this embodiment, the alarm 500 is a buzzer, which is an electronic sound-generating device that produces sound signals through vibration. Buzzers have advantages such as simple structure, low power consumption, fast response speed, strong real-time performance, small size, easy integration, high reliability, long lifespan, and adjustable tone.
[0066] like Figure 1 and Figure 2 As shown, in some embodiments of this application, the power supply device includes a signal light 600, which is connected to the controller 120 and is used to indicate the power status.
[0067] In this embodiment, when indicator light 600 is on, it indicates that the system power supply is normal; when indicator light 600 is off, it indicates that the power supply is faulty.
[0068] like Figure 1 and Figure 2 As shown, in some embodiments of this application, a reset button is provided on one side of the controller 120. Additionally, an indicator button is provided on one side of the controller 120, the indicator button having an indicator light, which includes at least a constant-on state, a flashing state (here referring to a slow flashing state), and an off state. In this embodiment, the indicator button 700 is a blue, illuminated, multi-function button.
[0069] Among them, when the indicator light on the indicator button 700 is off, it means that the system is in standby mode and will not issue a shutdown command if the transformer is overloaded; when the indicator light flashes slowly, it means that there is a fault and it can only be reset by pressing and holding the reset button for two seconds after the fault is cleared. After resetting, it will enter standby mode (indicator light off); when the indicator light stays on after a short press, it means that the system is operating normally; when the indicator light goes off after another short press, it means that the system is in standby mode.
[0070] When the indicator light illuminates, the power supply unit operates. The control box 100 collects the closing signal from the first signal interface 211 of the first circuit breaker 210; connection indicates activation, and disconnection indicates deactivation. The control box 100 also collects the closing signal from the second signal interface 221 of the second circuit breaker 220; connection indicates activation, and disconnection indicates deactivation. The first AC current transmitter 310 measures the current of the first current transformer 410 on the copper busbar at the output of the first circuit breaker 210 in real time, providing data for calculation by the controller 120. When one or more first circuit breakers 210 and second circuit breakers 220 are in use, collecting one set of closing signals from the first circuit breaker 210 and second circuit breaker 220 is considered as one unit, with an allowable current of 1.1 times that of one unit. Receiving two sets of signals is considered as two units, with the system allowable current being 1.1 times the sum of the rated currents of the corresponding transformers.
[0071] Based on the real-time current, the controller 120 calculates in advance the possible failure of one or more devices due to a lack of equipment, and the number of non-critical loads that will be disconnected if the current exceeds the allowable limit, according to the preset operating current value of the third circuit breaker 230 (a non-critical device). Once the system detects the loss of the closing signal of one of the first circuit breakers 210 or the second circuit breaker 220, and the current exceeds the allowable limit, the system will immediately send a trip signal to the third circuit breaker 230 through the third signal interface 231. The number of non-critical loads disconnected is determined by the system deducting preset parameters. The entire process takes ≤50 milliseconds, which is less than the 300 milliseconds required for transformer overload shutdown. After disconnection, the normal operation of critical equipment can be guaranteed, and the alarm 500 will issue an audible and visual alarm. Staff can troubleshoot and handle the problem based on the fault prompts on the touch screen.
[0072] Once the fault has been resolved, the operator resets the fault by pressing and holding the slowly flashing indicator button 700 for two seconds. After resetting, the blue light changes from slow flashing to off, and the system enters standby mode. The control box 100 disconnects the non-critical load tripping signal from the third circuit breaker 230. After pressing the indicator button 700 briefly once more, the light remains constantly on, and the system resumes normal operation. The controller 120 records the fault tripping location, fault time, maximum current before tripping, and current after actively tripping non-critical equipment, and displays this data on the touch screen 110 to provide valuable reference data for subsequent fault handling.
[0073] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.
[0074] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.
Claims
1. A power supply device characterized by comprising: include: Control box; Multiple circuit breakers, each circuit breaker having a signal interface terminal electrically connected to the control box, the circuit breakers being used to connect to a transformer or a low-voltage load; An AC current transmitter is electrically connected to the control box, and the AC current transmitter is connected to the circuit breaker through the signal interface terminal. A current transformer, which is connected to the AC current transmitter.
2. The power supply device according to claim 1, characterized by The plurality of circuit breakers includes at least one first circuit breaker, at least one second circuit breaker, and at least one third circuit breaker; The AC current transmitter includes at least one first AC current transmitter and at least one second AC current transmitter, wherein the first AC current transmitter is connected to the first circuit breaker and the second AC current transmitter is connected to the third circuit breaker.
3. The power supply device according to claim 2, wherein The first circuit breaker has a first signal interface terminal, the second circuit breaker has a second signal interface terminal, and the third circuit breaker has a third signal interface terminal; The first signal interface terminal, the second signal interface terminal, and the third signal interface terminal are respectively electrically connected to the control box; When the closing signal of the first circuit breaker and / or the second circuit breaker is lost, and the sum of the currents collected by the control box through the first AC current transmitter is greater than the preset allowable current of the remaining operating transformer, the control box sends a tripping signal to the third circuit breaker through the third signal interface terminal.
4. The power supply device according to claim 3, wherein The current transformer includes a first current transformer and a second current transformer. The first current transformer is connected to the first AC current transmitter, and the second current transformer is connected to the second AC current transmitter.
5. The power supply device according to any one of claims 1 to 4, characterized by, The control box includes a controller and a power supply, and the controller is connected to the power supply.
6. The power supply device according to claim 5, wherein A touch screen is provided on one side of the control box, and the touch screen is electrically connected to the controller.
7. The power supply device of claim 5, wherein The power supply device also includes an alarm, which is electrically connected to the controller so that the controller can control the alarm to start or stop.
8. The power supply device of claim 5, wherein, The power supply device includes a signal light, which is connected to the controller.
9. The power supply device of claim 5, wherein, The controller has an indicator button on one side, and the indicator button has an indicator light, which includes at least a constant light state, a flashing state, and an off state.
10. The power supply device of claim 5, wherein, A reset button is provided on one side of the controller.