Low-power-consumption ADMU system

Abstract

The utility model provides a low power consumption ADMU system, comprising a primary and secondary fusion pole-mounted switch and a power distribution terminal, the primary and secondary fusion pole-mounted switch is provided with a digital unit, an operating mechanism, a voltage sensor and a current sensor, and the power distribution terminal is provided with a CPU module, a power supply management module and a power supply module. The digital unit is used for collecting analog current and voltage signals and switching value signals and sending the analog current and voltage signals and the switching value signals to the CPU module through an RS485 bus. The digitization unit comprises a digitization ADMU module, a switching value acquisition module, an AD module and a power supply isolation unit, the digitization ADMU module is connected with the operation mechanism through the switching value acquisition module, and the digitization ADMU module is connected with the voltage sensor and the current sensor through the AD module. According to the utility model, the problem that a large number of cables are needed by traditional electromagnetic signals can be solved, so that the purposes of saving cost, reducing wiring failure rate and improving operation reliability of the controller are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution automation terminals, in particular to a low-power consumption ADMU system. Background Art

[0002] According to the requirements, the digital units required for digital distribution automation terminals are developed to meet all technical parameters included in the standard. The sampled signal is converted into digital quantity by the digital unit and then transmitted to the controller. It is necessary to solve the problems of signal synchronous sampling, data encoding, reliable transmission of high-speed signals, and low-latency decoding of high-speed signals to meet the national standard EMC requirements of distribution equipment.

[0003] In the prior art, the electrical signal obtained after collection generally needs to pass through a specific AD conversion module, a decoding module, an encoding module, etc., and then the encoded signal is sent to the terminal device. There are problems such as complex modules in signal processing and high equipment costs. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a low-power ADMU system, which can realize the digital transmission of analog signals, thereby solving the problem that traditional electromagnetic signals require a large number of cables, thereby achieving the purpose of saving costs, reducing wiring failure rate, and improving the operation reliability of the controller.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A low-power ADMU system, comprising a primary and secondary fusion pole switch and a power distribution terminal, wherein the primary and secondary fusion pole switch communicates with the power distribution terminal through a TX terminal and a MUDY terminal, the primary and secondary fusion pole switch is equipped with a digitization unit, an operating mechanism, a voltage sensor and a current sensor, the power distribution terminal is equipped with a CPU module, a power management module and a power supply module, the digitization unit is used to collect analog current and voltage signals and switch quantity signals, and send them to the CPU module through an RS485 bus;

[0007] Among them, the digital unit includes a digital ADMU module, a switch quantity acquisition module, an AD module and a power isolation unit. The digital ADMU module is connected to the operating mechanism through the switch quantity acquisition module, and the digital ADMU module is connected to the voltage sensor and the current sensor respectively through the AD module. The digital ADMU module is connected to the power management module of the distribution terminal through the power isolation unit, and the power management module is connected to the power module.

[0008] A further solution is that the operating mechanism includes an energy storage device, an opening device and a closing device. The energy storage device is linked with the closing device. When the energy storage device releases stored energy under the action of the switch of the closing device, the closing operation is realized. The opening device is linked with the closing device and can store opening energy during the closing operation. When the switch of the opening device is started, the opening device releases the opening energy to realize the opening operation.

[0009] A further solution is that the primary and secondary fusion pole switch is also used to output phase voltage, phase current, zero-sequence voltage and zero-sequence current signals through the voltage sensor and current sensor.

[0010] A further solution is to further include an arc extinguishing structure, which includes a vacuum arc extinguishing chamber and an isolating knife placed in a sealed box. The isolating knife is connected in series with the vacuum arc extinguishing chamber, and an insulating shaft is connected in series between the vacuum arc extinguishing chamber and the isolating knife switch, respectively, for driving the opening and closing of the vacuum arc extinguishing chamber and the isolating knife switch, and the operating mechanism is placed in the sealed box to directly drive the action of the insulating shaft.

[0011] A further solution is that the CPU module is a stm32f407 chip.

[0012] A further solution is to further include a temperature sensor and a wireless communication unit, wherein the temperature sensor detects the temperature changes of the output circuits of the voltage sensor and the current sensor in real time through a thermistor, and sends the detected temperature signal to the power distribution terminal in real time; wherein the input end of the temperature sensor is connected to the output end of the voltage sensor and the current sensor, the output end of the temperature sensor is connected to the input end of the wireless communication unit, and the wireless communication unit establishes wireless communication with the power distribution terminal.

[0013] A further solution is to further include a display module, which is used to display various parameters in the processed signal, and the display module includes a display processing unit and a display; the input end of the display processing unit is connected to the signal output port of the signal processing module, and the output end of the display processing unit is connected to the display.

[0014] A further solution is that the digital ADMU module adopts Manchester encoding, an industrial CPU is arranged in the digital ADMU module, the AD module is a 16-bit high-precision A / D chip, and the sampling frequency of the A / D chip is 8kHz.

[0015] It can be seen that the utility model uses AD to collect analog secondary voltage and current small signals, collects switch signals through digital ADMU, encodes the sampled data, and sends it to the distribution terminal through the RS485 bus. The distribution terminal decodes and calculates after receiving the sampled data. Therefore, the utility model integrates the AD conversion function and decoding and encoding function in the traditional feeder system more comprehensively, reducing the equipment cost; at the same time, the voltage and current of the primary line are collected more accurately through the mutual inductor module, and the digital switch sends the measurement signal and protection signal more accurately, avoiding the problems of collection interference and signal attenuation; the terminal calculates the various parameters of the primary line more accurately, increases the basis parameters of logical judgment, and enables the terminal to operate the protection logic safely and stably.

[0016] Furthermore, the utility model converts the sampling signal into a digital quantity through a digitizing unit and transmits it to the controller, thereby solving the problems of analog signal transmission and access degradation caused by different secondary loads and impedance mismatch, as well as signal transmission interference.

[0017] Furthermore, the utility model can simultaneously output phase voltage, zero-sequence voltage and phase current, zero-sequence current sampling signals through a digital unit, and can be matched with a ZW32 type pole-mounted high-voltage switch, having the characteristics of low power consumption, high accuracy, and three-in-one measurement, metering, and protection.

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a circuit schematic diagram of a low-power ADMU system embodiment. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1A low-power ADMU system involved in this embodiment includes a primary and secondary fusion pole switch 10 and a power distribution terminal 20. The primary and secondary fusion pole switch 10 communicates with the power distribution terminal 20 through a TX terminal and a MUDY terminal. The primary and secondary fusion pole switch 10 is equipped with a digitization unit 11, an operating mechanism 12, a voltage sensor 13, and a current sensor 14. The power distribution terminal 20 is equipped with a CPU module 21, a power management module 22, and a power supply module 23. The digitization unit 11 is used to collect analog current and voltage signals and switch quantity signals, and send them to the CPU module 21 through an RS485 bus;

[0022] Among them, the digitalization unit 11 includes a digital ADMU module 111, a switch quantity acquisition module 112, an AD module 113 and a power isolation unit 114. The digital ADMU module 111 is connected to the operating mechanism 12 through the switch quantity acquisition module 112, the digital ADMU module 111 is respectively connected to the voltage sensor 13 and the current sensor 14 through the AD module 113, the digital ADMU module 111 is connected to the power management module 22 of the distribution terminal 20 through the power isolation unit 114, and the power management module 22 is connected to the power module 23.

[0023] The power module 23 is a 24V battery pack; there are three voltage sensors 13 and three current sensors 14, which are equidistantly arranged.

[0024] In this embodiment, the operating mechanism 12 includes an energy storage device, a switch-off device and a closing device. The energy storage device is linked with the closing device. When the energy storage device releases the stored energy under the action of the switch of the closing device, the closing operation is realized. The switch-off device is linked with the closing device and can store energy for the switch-off during the closing operation. When the switch of the switch-off device is started, the switch-off device releases the stored energy for the switch-off to realize the switch-off operation. It can be seen that the isolation knife switch is connected in series with the vacuum interrupter, and the two insulating shafts are driven by the operating mechanism 12 respectively. After the switch-off, a double break is formed, and the insulation strength is high.

[0025] In this embodiment, the primary and secondary fusion pole-mounted switch 10 is also used to output phase voltage, phase current, zero-sequence voltage and zero-sequence current signals through the voltage sensor 13 and the current sensor 14. It can be matched with the ZW32 type pole-mounted high-voltage switch, and has the characteristics of low power consumption, high accuracy, and three-in-one measurement, metering and protection.

[0026] In this embodiment, an arc extinguishing structure is also included, which includes a vacuum arc extinguishing chamber and an isolating knife placed in a sealed box. The isolating knife is connected in series with the vacuum arc extinguishing chamber, and an insulating shaft is connected in series between the vacuum arc extinguishing chamber and the isolating knife switch, which are used to drive the opening and closing of the vacuum arc extinguishing chamber and the isolating knife switch, respectively. The operating mechanism 12 is placed in the sealed box to directly drive the action of the insulating shaft.

[0027] As a preferred embodiment, the CPU module 21 is a stm32f407 chip. Among them, the MCU adopts stm32f407, operates at a frequency of 168mhz, and has a working current of only 100mA at a voltage of 3.3V. The entire ADMU can achieve a power consumption of less than 1.5W, which is more in line with the State Grid Corporation's requirements for low power consumption compared to the solution of using FPGA (altera cyclone IV) + AD (power consumption 5W+).

[0028] In this embodiment, a temperature sensor and a wireless communication unit are also included. The temperature sensor detects the temperature changes of the output circuits of the voltage sensor 13 and the current sensor 14 in real time through a thermistor, and sends the detected temperature signal to the power distribution terminal 20 in real time; wherein the input end of the temperature sensor is connected to the output end of the voltage sensor 13 and the current sensor 14, the output end of the temperature sensor is connected to the input end of the wireless communication unit, and the wireless communication unit establishes wireless communication with the power distribution terminal 20.

[0029] In this embodiment, a display module is also included. The display module is used to display various parameters in the processed signal. The display module includes a display processing unit and a display; the input end of the display processing unit is connected to the signal output port of the signal processing module, and the output end of the display processing unit is connected to the display.

[0030] In this embodiment, the digital ADMU module 111 adopts Manchester encoding, an industrial CPU is provided in the digital ADMU module 111, the AD module 113 is a 16-bit high-precision A / D chip, and the sampling frequency of the A / D chip is 8 kHz.

[0031] In this embodiment, the digitization unit 11 (ADMU module) includes the functions of the primary converter (AD), secondary converter and merging unit (MU) defined in GB / T20840.8, and is a component of the field transformer (according to Article 3.4.2 of GB / T2.840.8-2007). It, together with the primary voltage and current sensor 14, constitutes an electronic combined transformer with a digital output interface. Among them, the digitization unit 11 uses AD to collect analog secondary voltage and current small signals, collects switch quantity signals through circuits, and after encoding the sampled data, sends it to the distribution terminal 20 through the RS485 bus. After receiving the sampled data, the distribution terminal 20 decodes and calculates it. The power supply of the digitization unit 11 is provided by the distribution terminal 20.

[0032] In summary, this embodiment uses AD to collect analog secondary voltage and current small signals, collects switch signals through digital ADMU, and after encoding the sampled data, sends it to the distribution terminal 20 through the RS485 bus. The distribution terminal 20 decodes and calculates after receiving the sampled data. Therefore, this embodiment integrates the AD conversion function and decoding and encoding function in the traditional feeder system more integratedly, reducing the equipment cost; at the same time, the voltage and current of the primary line are collected more accurately through the mutual inductor module, and the digital switch sends the measurement signal and protection signal more accurately, avoiding the problems of collection interference and signal attenuation; the terminal calculates the various parameters of the primary line more accurately, and increases the basis parameters of logical judgment, so that the terminal can safely and stably operate the protection logic.

[0033] Furthermore, this embodiment converts the sampling signal into a digital quantity through the digitizing unit 11 and transmits it to the controller, thereby solving the problems of analog signal transmission and access degradation caused by different secondary loads and impedance mismatch, as well as signal transmission interference.

[0034] Furthermore, this embodiment can simultaneously output phase voltage, zero-sequence voltage and phase current, zero-sequence current sampling signals through the digital unit 11, and can be matched with the ZW32 type pole-mounted high-voltage switch, with the characteristics of low power consumption, high accuracy, and three-in-one measurement, metering, and protection.

[0035] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A low power ADMU system, characterized in that: include: A primary and secondary fusion pole switch and a power distribution terminal, wherein the primary and secondary fusion pole switch and the power distribution terminal communicate with each other through a TX terminal and a MUDY terminal, the primary and secondary fusion pole switch is equipped with a digitization unit, an operating mechanism, a voltage sensor and a current sensor, and the power distribution terminal is equipped with a CPU module, a power management module and a power supply module, and the digitization unit is used to collect analog current and voltage signals and switch quantity signals, and send them to the CPU module through an RS485 bus; Among them, the digital unit includes a digital ADMU module, a switch quantity acquisition module, an AD module and a power isolation unit. The digital ADMU module is connected to the operating mechanism through the switch quantity acquisition module, and the digital ADMU module is connected to the voltage sensor and the current sensor respectively through the AD module. The digital ADMU module is connected to the power management module of the distribution terminal through the power isolation unit, and the power management module is connected to the power module.

2. The low power ADMU system according to claim 1, characterized in that: The operating mechanism includes an energy storage device, an opening device and a closing device. The energy storage device is linked with the closing device. When the energy storage device releases stored energy under the action of the switch of the closing device, the closing operation is realized. The opening device is linked with the closing device and can store opening energy during the closing operation. When the switch of the opening device is started, the opening device releases the opening energy to realize the opening operation.

3. The low power ADMU system according to claim 1, characterized in that: The primary and secondary fusion pole switch is also used to output phase voltage, phase current, zero-sequence voltage and zero-sequence current signals through the voltage sensor and current sensor.

4. The low power ADMU system according to claim 1, characterized in that: It also includes an arc extinguishing structure, which includes a vacuum arc extinguishing chamber and an isolating knife placed in a sealed box. The isolating knife is connected in series with the vacuum arc extinguishing chamber. An insulating shaft is connected in series between the vacuum arc extinguishing chamber and the isolating knife switch, respectively, for driving the vacuum arc extinguishing chamber and the isolating knife switch to open and close, and the operating mechanism is placed in the sealed box to directly drive the action of the insulating shaft.

5. The low power ADMU system according to claim 1, characterized in that: The CPU module is a stm32f407 chip.

6. The low power ADMU system according to claim 1, characterized in that: It also includes a temperature sensor and a wireless communication unit. The temperature sensor detects the temperature changes of the output circuits of the voltage sensor and the current sensor in real time through a thermistor, and sends the detected temperature signal to the power distribution terminal in real time; wherein the input end of the temperature sensor is connected to the output end of the voltage sensor and the current sensor, the output end of the temperature sensor is connected to the input end of the wireless communication unit, and the wireless communication unit establishes wireless communication with the power distribution terminal.

7. The low power ADMU system according to any one of claims 1 to 6, characterized in that: It also includes a display module, which is used to display various parameters in the processed signal. The display module includes a display processing unit and a display; the input end of the display processing unit is connected to the signal output port of the signal processing module, and the output end of the display processing unit is connected to the display.

8. The low power ADMU system according to any one of claims 1 to 6, characterized in that: The digital ADMU module adopts Manchester encoding, an industrial CPU is arranged in the digital ADMU module, the AD module is a 16-bit high-precision A / D chip, and the sampling frequency of the A / D chip is 8kHz.

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