Electric energy monitoring device for smart park

Abstract

The utility model discloses an electric energy monitoring device for a smart park, which comprises a plurality of line fault indicators arranged on incoming and outgoing lines of switch cabinets in the park, and a first constant-voltage current-limiting circuit and a first rechargeable battery pack are arranged in each line fault indicator. The first constant-voltage current-limiting circuit is connected with the first rechargeable battery pack so as to realize constant-voltage current-limiting charging; the monitoring terminal is used for being arranged in a power distribution cabinet in the central area of the park, and the line fault indicator is in communication connection with the monitoring terminal so as to be used for feeding back the line state. And the safety of the charging process is improved. Line fault information can be fed back to a monitoring terminal in time, and automatic monitoring and automatic fault reporting of park electric energy monitoring are ensured.

Description

Technical Field

[0001] The utility model relates to the field of smart parks, and in particular to an electric energy monitoring device for smart parks. Background Art

[0002] A smart park is an innovative and future-oriented park that integrates the new generation of information and communication technologies and aims at sustainable development.

[0003] Smart parks have high requirements for the degree of automation of power monitoring, and need to realize automatic monitoring and automatic reporting of power line faults. Existing power monitoring devices achieve the above functions through line fault indicators and monitoring terminals. When a short circuit, open circuit or other faults occur in the line, the line fault indicator will be fed back to the monitoring terminal in real time, and the monitoring terminal will then feed back the fault data to the main station server, realizing automatic monitoring and automatic reporting of power line faults.

[0004] Typically, line fault indicators are powered by the power lines they are connected to. However, if a short circuit occurs, the indicators can only transmit fault information to the monitoring terminal using their built-in batteries. To avoid frequent battery replacements, line fault indicators are equipped with rechargeable batteries. However, if existing rechargeable batteries have a low initial voltage, the initial charging current will be very high, which can easily pose a safety hazard and increase the security risks of smart campuses. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an electric energy monitoring device for a smart park, which can achieve safe charging of a line fault indicator and reduce the safety risks of the smart park.

[0006] According to the first aspect of the embodiment of the utility model, the electric energy monitoring device of the smart park includes: multiple line fault indicators, multiple line fault indicators are used to be set on the incoming and outgoing lines of each switch cabinet in the park, a first constant voltage current limiting circuit and a first rechargeable battery pack are provided in the line fault indicator, the first constant voltage current limiting circuit is connected to the first rechargeable battery pack for realizing constant voltage current limiting charging; a monitoring terminal, the monitoring terminal is used to be set in the distribution cabinet in the central area of ​​the park, and the line fault indicator is communicatively connected to the monitoring terminal for feedback of the line status.

[0007] The power monitoring device for a smart park according to the embodiment of the present invention has at least the following beneficial effects:

[0008] In the embodiment of the present utility model, a first constant voltage current limiting circuit and a first rechargeable battery pack are provided in the line fault indicator. When the line is normal, the line fault indicator charges the first rechargeable battery pack with constant voltage and current limiting through the first constant voltage current limiting circuit, thereby avoiding excessive charging current and improving the safety of the charging process. When a line fault such as a circuit breaker occurs, the line fault indicator is powered by the first rechargeable battery pack, and line fault information can be fed back to the monitoring terminal in a timely manner, thereby ensuring automatic monitoring of the park power monitoring and automatic reporting of faults.

[0009] According to some embodiments of the present utility model, the line fault indicator also includes a sampling module, a metering chip, a first MCU and a first wireless communication module, the sampling module is connected to the metering chip for feedback of voltage and current sampling data, the metering chip is connected to the first MCU for feedback of electric energy data, the first MCU and the first wireless communication module are used to communicate with the monitoring terminal, and the first MCU is connected to the control end of the first constant voltage and current limiting circuit.

[0010] According to some embodiments of the present invention, the first constant voltage and current limiting circuit includes a power supply terminal VCC1, an error amplifier U11, an error amplifier U12, a MOS transistor Q11, and a differential amplifier U13. The power supply terminal VCC1 is connected to the non-inverting terminal of the error amplifier U11 through a resistor R11, the inverting terminal of the error amplifier U11 is connected to the drain of the MOS transistor Q11 through a resistor R14, the output terminal of the error amplifier U11 is connected to the gate of the MOS transistor Q11 through a switch S1, the power supply terminal VCC1 is connected to the drain of the MOS transistor Q1 through a resistor R13, and the source of the MOS transistor Q11 is connected to the positive electrode of the first rechargeable battery pack. The negative electrode of the first rechargeable battery pack is grounded, the positive electrode of the first rechargeable battery pack is connected to the non-inverting terminal of the differential amplifier U13, the negative electrode of the first rechargeable battery pack is connected to the inverting terminal of the differential amplifier U13, the output terminal of the differential amplifier U13 is connected to the inverting terminal of the error amplifier U12, the output terminal of the differential amplifier U13 is connected to the voltage feedback terminal of the first MCU, the DAC signal output terminal of the first MCU is connected to the non-inverting terminal of the error amplifier U12, the output terminal of the error amplifier U12 is connected to the gate of the MOS tube Q11 through the switch S2, and the first MCU is connected to the control terminals of the switches S1 and S2 respectively.

[0011] According to some embodiments of the present invention, the first wireless communication module is any one of a Zigbee module, a LoRa module, and an NB-IoT module.

[0012] According to some embodiments of the present invention, the line fault indicator further includes a buzzer, and the first MCU is connected to the buzzer.

[0013] According to some embodiments of the present invention, the line fault indicator further includes an indicator light, and the first MCU is connected to the indicator light.

[0014] According to some embodiments of the present invention, a second MCU, a second constant voltage current limiting circuit and a second rechargeable battery pack are provided in the monitoring terminal, the second constant voltage current limiting circuit is connected to the second rechargeable battery pack for realizing constant voltage current limiting charging, and the second MCU is connected to the control end of the second constant voltage current limiting circuit.

[0015] According to some embodiments of the present invention, the second constant voltage and current limiting circuit includes a power supply terminal VCC2, an error amplifier U21, an error amplifier U22, a MOS transistor Q21, and a differential amplifier U23. The power supply terminal VCC2 is connected to the non-inverting terminal of the error amplifier U21 through a resistor R21, the inverting terminal of the error amplifier U21 is connected to the drain of the MOS transistor Q21 through a resistor R24, the output terminal of the error amplifier U21 is connected to the gate of the MOS transistor Q21 through a switch S3, the power supply terminal VCC2 is connected to the drain of the MOS transistor Q1 through a resistor R23, and the source of the MOS transistor Q21 is connected to the positive electrode of the second rechargeable battery pack. The negative electrode of the second rechargeable battery pack is grounded, the positive electrode of the second rechargeable battery pack is connected to the non-inverting terminal of the differential amplifier U23, the negative electrode of the second rechargeable battery pack is connected to the inverting terminal of the differential amplifier U23, the output terminal of the differential amplifier U23 is connected to the inverting terminal of the error amplifier U22, the output terminal of the differential amplifier U23 is connected to the voltage feedback terminal of the second MCU, the DAC signal output terminal of the second MCU is connected to the non-inverting terminal of the error amplifier U22, the output terminal of the error amplifier U22 is connected to the gate of the MOS tube Q21 through the switch S4, and the second MCU is connected to the control terminals of the switches S3 and S4 respectively.

[0016] According to some embodiments of the present invention, a 5G module or a network port module is provided in the monitoring terminal for connecting to a main station.

[0017] According to some embodiments of the present invention, the first rechargeable battery pack is a nickel-metal hydride battery pack.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1This is a functional block diagram of the power monitoring device for a smart park in an embodiment of the present utility model;

[0021] Figure 2 This is a circuit diagram of a first constant voltage current limiting circuit in an embodiment of the present utility model;

[0022] Figure 3 2 is a circuit diagram of a second constant voltage current limiting circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0023] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Reference Figure 1 As shown, an electric energy monitoring device for a smart park includes: multiple line fault indicators and a monitoring terminal. Among them, multiple line fault indicators are respectively set on the incoming and outgoing lines of each switch cabinet in the park, and their main function is to monitor the status of the corresponding lines and determine whether faults such as short circuits or open circuits occur. A first constant voltage current limiting circuit and a first rechargeable battery pack are set in the line fault indicator, and the first constant voltage current limiting circuit is connected to the first rechargeable battery pack to achieve constant voltage current limiting charging. The monitoring terminal is used to be set in a power distribution cabinet in the central area of ​​the park. The line fault indicator is communicated with the monitoring terminal to feedback the line status. The monitoring terminal can realize electric energy monitoring of the entire park line by obtaining the line status feedback from all line fault indicators.

[0028] In the embodiment of the present utility model, a first constant voltage current limiting circuit and a first rechargeable battery pack are provided in the line fault indicator. When the line is normal, the line fault indicator charges the first rechargeable battery pack with constant voltage and current limiting through the first constant voltage current limiting circuit, thereby avoiding excessive charging current and improving the safety of the charging process. When a line fault such as a circuit breaker occurs, the line fault indicator is powered by the first rechargeable battery pack, and line fault information can be fed back to the monitoring terminal in a timely manner, thereby ensuring automatic monitoring of the park power monitoring and automatic reporting of faults.

[0029] Specifically, in this embodiment, the line fault indicator further includes a sampling module, a metering chip, a first MCU, and a first wireless communication module. The sampling module is connected to the metering chip for feeding back voltage and current sampling data, the metering chip is connected to the first MCU for feeding back electric energy data, the first MCU is connected to the first wireless communication module for communicating with a monitoring terminal, and the first MCU is connected to the control end of a first constant voltage and current limiting circuit. The sampling module includes a current transformer and a voltage transformer. The current transformer and the voltage transformer are used to obtain a three-phase AC signal from the power line and input it into the metering chip. The metering chip uses an FFT algorithm to analyze and process the three-phase AC signal to obtain data such as full-wave, fundamental, and harmonic three-phase voltage and current RMS values, and transmits the relevant data to the first MCU for logical processing. The first MCU performs logical operations based on the full-wave, fundamental, and harmonic three-phase voltage and current RMS values ​​fed back by the metering chip to determine whether a line fault, such as a short circuit or open circuit, has occurred.

[0030] In this embodiment, the first wireless communication module is any one of a Zigbee module, a LoRa module, and an NB-IoT module. The line fault indicator is networked with the monitoring terminal via the Zigbee, LoRa, or NB-IoT module, providing real-time feedback on line status data and improving the reliability of power monitoring. These modules offer low power consumption and stable networking, improving the reliability of power monitoring in smart parks while reducing energy consumption.

[0031] refer to Figure 2As shown, in this embodiment, the first constant voltage current limiting circuit includes a power supply terminal VCC1, an error amplifier U11, an error amplifier U12, a MOS transistor Q11 and a differential amplifier U13. The power supply terminal VCC1 is connected to the non-inverting terminal of the error amplifier U11 through a resistor R11, the inverting terminal of the error amplifier U11 is connected to the drain of the MOS transistor Q11 through a resistor R14, the output terminal of the error amplifier U11 is connected to the gate of the MOS transistor Q11 through a switch S1, the power supply terminal VCC1 is connected to the drain of the MOS transistor Q1 through a resistor R13, and the source of the MOS transistor Q11 is connected to the first charging circuit through a resistor R15. The positive electrode of the first rechargeable battery pack is connected to the positive electrode of the first rechargeable battery pack, the negative electrode of the first rechargeable battery pack is grounded, the positive electrode of the first rechargeable battery pack is connected to the non-inverting terminal of the differential amplifier U13, the negative electrode of the first rechargeable battery pack is connected to the inverting terminal of the differential amplifier U13, the output terminal of the differential amplifier U13 is connected to the inverting terminal of the error amplifier U12, the output terminal of the differential amplifier U13 is connected to the voltage feedback terminal of the first MCU, the DAC signal output terminal of the first MCU is connected to the non-inverting terminal of the error amplifier U12, the output terminal of the error amplifier U12 is connected to the gate of the MOS tube Q11 through the switch S2, and the first MCU is connected to the control terminals of the switches S1 and S2 respectively.

[0032] The following takes the first constant voltage and current limiting circuit as an example to explain in detail the working principle of constant voltage and current limiting charging:

[0033] When charging starts, the first MCU controls the switch S1 to turn on and the switch S2 to turn off. At this time, charging is performed in current limiting mode. The output end of the error amplifier U1 controls the conduction degree of the MOS tube Q1, so that the voltage across the resistor R13 remains unchanged, thereby achieving current limiting charging. In this application, the resistor R13 is a fixed resistor, and the resistors R11, R12, and R14 are adjustable resistors. The first MCU can change the current limit in the current limiting mode by adjusting the resistance values ​​of the resistors R11, R12, and R14.

[0034] The first MCU obtains the voltage across the first rechargeable battery pack through the differential amplifier U13. When the voltage of the first rechargeable battery pack rises to a certain level, the first MCU controls the switch S1 to be disconnected and the switch S2 to be turned on. At this time, charging is carried out in a constant voltage mode. The first MCU outputs a voltage control value to the error amplifier U12. The differential amplifier U13 inputs the voltage value of the first rechargeable battery pack to the error amplifier U12. The error amplifier U12 compares the voltage value of the first rechargeable battery pack with the voltage control value output by the first MCU and outputs a control signal to control the conduction degree of the MOS tube unit to keep the charging voltage across the first rechargeable battery pack unchanged.

[0035] Because the switch cabinet has many incoming and outgoing lines, in order to enable operation and maintenance personnel to quickly identify which line is faulty on site, the line fault indicator in this application also includes a buzzer and an indicator light, and the first MCU is connected to the buzzer and the indicator light respectively. The sound and light alarm can achieve dual alarms of local and remote alarms, further improving the reliability of power monitoring and helping operation and maintenance personnel quickly locate the faulty line on site.

[0036] Among them, the monitoring terminal is equipped with a second MCU, a second constant voltage current limiting circuit and a second rechargeable battery pack. The second constant voltage current limiting circuit is connected to the second rechargeable battery pack to realize constant voltage current limiting charging, and the second MCU is connected to the control end of the second constant voltage current limiting circuit.

[0037] Since the monitoring terminal is also powered by the power supply terminals in the power distribution cabinet, which also carries the risk of power outages, the monitoring terminal will be offline at the master station and unable to upload power outage fault information. Therefore, the monitoring terminal is usually equipped with a battery to provide backup power in the event of a power outage. To improve the safety and charging reliability of the monitoring terminal, this embodiment also provides a second constant voltage and current limiting circuit in the monitoring terminal.

[0038] refer to Figure 3 As shown, the second constant voltage current limiting circuit includes a power supply terminal VCC2, an error amplifier U21, an error amplifier U22, a MOS transistor Q21 and a differential amplifier U23. The power supply terminal VCC2 is connected to the non-inverting terminal of the error amplifier U21 through a resistor R21, the inverting terminal of the error amplifier U21 is connected to the drain of the MOS transistor Q21 through a resistor R24, the output terminal of the error amplifier U21 is connected to the gate of the MOS transistor Q21 through a switch S3, the power supply terminal VCC2 is connected to the drain of the MOS transistor Q1 through a resistor R23, and the source of the MOS transistor Q21 is connected to the gate of the MOS transistor Q21. The positive electrode of the second rechargeable battery pack is connected to the positive electrode of the second rechargeable battery pack, the negative electrode of the second rechargeable battery pack is grounded, the positive electrode of the second rechargeable battery pack is connected to the non-inverting terminal of the differential amplifier U23, the negative electrode of the second rechargeable battery pack is connected to the inverting terminal of the differential amplifier U23, the output terminal of the differential amplifier U23 is connected to the inverting terminal of the error amplifier U22, the DAC signal output terminal of the second MCU is connected to the non-inverting terminal of the error amplifier U22, the output terminal of the error amplifier U22 is connected to the gate of the MOS tube Q21 through the switch S4, and the second MCU is connected to the control terminals of the switches S3 and S4 respectively.

[0039] It should be understood that the working principle of the second constant-voltage current limiting circuit is the same as that of the first constant-voltage current limiting circuit, and will not be described in detail here.

[0040] In this embodiment, a 5G module or a network port module is provided in the monitoring terminal. The monitoring terminal is connected to the main station through the 5G module or the network port module, and can report fault information and other power monitoring data in a timely manner.

[0041] In the embodiment of the present invention, both the first and second rechargeable battery packs utilize nickel-metal hydride (NiMH) batteries. NiMH batteries offer superior safety, are less susceptible to thermal runaway, and have a long cycle life, making them suitable for power monitoring equipment. Of course, in addition to NiMH batteries, the first and second rechargeable battery packs may also utilize lithium batteries, lead-acid batteries, or the like.

[0042] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An electric energy monitoring device for a smart park, characterized in that: include: A plurality of line fault indicators, wherein the plurality of line fault indicators are used to be arranged on the inlet and outlet lines of each switch cabinet in the park, wherein a first constant voltage current limiting circuit and a first rechargeable battery pack are arranged in the line fault indicator, and the first constant voltage current limiting circuit is connected to the first rechargeable battery pack to realize constant voltage current limiting charging; The monitoring terminal is used to be arranged in a power distribution cabinet in the central area of ​​the park, and the line fault indicator is communicatively connected with the monitoring terminal to feedback the line status.

2. The power monitoring device for a smart park according to claim 1, characterized in that: The line fault indicator also includes a sampling module, a metering chip, a first MCU and a first wireless communication module. The sampling module is connected to the metering chip for feeding back voltage and current sampling data, the metering chip is connected to the first MCU for feeding back electric energy data, the first MCU and the first wireless communication module are used to communicate with the monitoring terminal, and the first MCU is connected to the control end of the first constant voltage and current limiting circuit.

3. The power monitoring device for a smart park according to claim 2 is characterized in that: The first constant voltage current limiting circuit includes a power supply terminal VCC1, an error amplifier U11, an error amplifier U12, a MOS tube Q11 and a differential amplifier U13, wherein the power supply terminal VCC1 is connected to the in-phase terminal of the error amplifier U11 through a resistor R11, the inverting terminal of the error amplifier U11 is connected to the drain of the MOS tube Q11 through a resistor R14, the output terminal of the error amplifier U11 is connected to the gate of the MOS tube Q11 through a switch S1, the power supply terminal VCC1 is connected to the drain of the MOS tube Q1 through a resistor R13, the source of the MOS tube Q11 is connected to the positive electrode of the first charging battery pack, and the first charging battery pack is connected to the positive electrode of the first charging battery pack. The negative electrode of the first rechargeable battery pack is grounded, the positive electrode of the first rechargeable battery pack is connected to the non-inverting end of the differential amplifier U13, the negative electrode of the first rechargeable battery pack is connected to the inverting end of the differential amplifier U13, the output end of the differential amplifier U13 is connected to the inverting end of the error amplifier U12, the output end of the differential amplifier U13 is connected to the voltage feedback end of the first MCU, the DAC signal output end of the first MCU is connected to the non-inverting end of the error amplifier U12, the output end of the error amplifier U12 is connected to the gate of the MOS tube Q11 through the switch S2, and the first MCU is respectively connected to the control ends of the switch S1 and the switch S2.

4. The power monitoring device for a smart park according to claim 2, characterized in that: The first wireless communication module is any one of a Zigbee module, a LoRa module, and a NB-IoT module.

5. The power monitoring device for a smart park according to claim 2, characterized in that: The line fault indicator also includes a buzzer, and the first MCU is connected to the buzzer.

6. The power monitoring device for a smart park according to claim 2, characterized in that: The line fault indicator also includes an indicator light, and the first MCU is connected to the indicator light.

7. The power monitoring device for a smart park according to claim 1, characterized in that: The monitoring terminal is provided with a second MCU, a second constant voltage current limiting circuit and a second rechargeable battery pack. The second constant voltage current limiting circuit is connected to the second rechargeable battery pack for realizing constant voltage current limiting charging. The second MCU is connected to the control end of the second constant voltage current limiting circuit.

8. The power monitoring device for a smart park according to claim 7, characterized in that: The second constant voltage current limiting circuit includes a power supply terminal VCC2, an error amplifier U21, an error amplifier U22, a MOS tube Q21 and a differential amplifier U23, wherein the power supply terminal VCC2 is connected to the non-inverting terminal of the error amplifier U21 through a resistor R21, the inverting terminal of the error amplifier U21 is connected to the drain of the MOS tube Q21 through a resistor R24, the output terminal of the error amplifier U21 is connected to the gate of the MOS tube Q21 through a switch S3, the power supply terminal VCC2 is connected to the drain of the MOS tube Q1 through a resistor R23, the source of the MOS tube Q21 is connected to the positive electrode of the second charging battery pack, and the second charging battery pack is connected to the positive electrode of the second charging battery pack. The negative electrode of the second rechargeable battery pack is grounded, the positive electrode of the second rechargeable battery pack is connected to the non-inverting end of the differential amplifier U23, the negative electrode of the second rechargeable battery pack is connected to the inverting end of the differential amplifier U23, the output end of the differential amplifier U23 is connected to the inverting end of the error amplifier U22, the output end of the differential amplifier U23 is connected to the voltage feedback end of the second MCU, the DAC signal output end of the second MCU is connected to the non-inverting end of the error amplifier U22, the output end of the error amplifier U22 is connected to the gate of the MOS tube Q21 through the switch S4, and the second MCU is respectively connected to the control ends of the switch S3 and the switch S4.

9. The power monitoring device for a smart park according to claim 1, characterized in that: The monitoring terminal is provided with a 5G module or a network port module for connecting to a main station.

10. The power monitoring device for a smart park according to claim 1, characterized in that: The first rechargeable battery pack is a nickel-hydrogen battery pack.

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