CN202305694U - Harmonic-wave electric quantity energy efficiency collection terminal - Google Patents

Abstract

The utility model provides a harmonic-wave electric quantity energy efficiency collection terminal, which comprises a shell, a microprogrammed control unit (MCU) module, a sensor module, a power supply storage module, a measurement module and a communication module, wherein the sensor module and the power supply storage module are respectively connected with the MCU module, the measurement module and the communication module are respectively connected with the MCU module, and the communication module is selected from a recommended standard (RS)485 interface, a programmable logic controller (PLC) unit or a micropower wireless unit. The harmonic-wave electric quantity energy efficiency collection terminal is capable of collecting multiple harmonic-wave electric quantity parameters by means of cluster deployment.

Description

A Harmonic Power Type Energy Efficiency Collection Terminal

technical field

The utility model relates to an energy efficiency acquisition device in the electrical instrumentation industry, in particular to a harmonic power type energy efficiency acquisition terminal.

Background technique

The lack of basic technology and basic data in the existing technology has brought great obstacles to the overall development of the energy-saving industry. Accurate basic energy efficiency data is the key to evaluating the effect of all energy-saving technologies. At present, the confusion of various energy-saving data and energy-efficiency information has brought many hidden dangers to the energy-saving industry. Therefore, it is urgent to establish a unified energy efficiency data center to obtain comprehensive energy-saving service industry data, provide data support and technical support for the development of the energy-saving industry, monitor energy-saving projects and evaluate energy-saving service agencies, and provide energy-saving policies for the country and government agencies at all levels Provide support.

Accurate energy efficiency basic data mainly depends on on-site real-time collection, which needs to be collected and transmitted by a dedicated collection terminal. There are many electrical parameters such as phase/line voltage/current, power factor, fundamental wave power, harmonic power, etc. in the actual site. The real-time collection effect of these parameters directly affects the reliability of the energy efficiency analysis results. Therefore, it is urgent to develop a real-time harmonic power type energy efficiency acquisition terminal that meets the requirements of industrial sites and energy efficiency monitoring.

The utility model with the patent number ZL201020214236.2 discloses a special transformer collection terminal equipped with a modular communication module, which is a device for collecting electric energy information of special transformer users. The remote communication module and the signal expansion interface module solidified in the specific variable acquisition terminal are designed as plug-in modules, and uniform pins are formulated.

The utility model with the patent number ZL200920069055.2 discloses a wireless data collection terminal, which includes a radio frequency identification module, a main control module and a communication module to realize wireless data collection and wireless transmission.

The utility model with the patent number ZL200920279096.4 discloses a collection terminal for a power management system for easy deployment and expansion.

The utility model with the patent number ZL200920236498.6 discloses a collection terminal for centralized meter reading system of low-voltage power users, which can be operated on the master station to realize remote system update.

The above utility models provide a technical basis for the research and development of harmonic power type energy efficiency collection terminals, but they do not meet the requirements of cluster deployment, multiple data type collection, and multiple interface transmission to fully adapt to industrial site energy efficiency harmonic power collection.

Utility model content

In order to overcome the above defects, the utility model provides a harmonic power type energy efficiency collection terminal, which can collect various harmonic power parameters through cluster deployment.

In order to achieve the above purpose, the utility model provides a harmonic power type energy efficiency collection terminal, the collection terminal includes: a housing, an MCU module, a sensor module and a power storage module respectively connected to the MCU module, and its improvement lies in , a metering module and a communication module respectively connected to the MCU module; all the above-mentioned modules are arranged in the casing.

In the preferred technical solution provided by the utility model, the sensor module includes a flow sensor, a humidity sensor, a pressure sensor, and a temperature sensor; the sensor module transmits the collected parameters to the MCU module.

In the second preferred technical solution provided by the utility model, the power storage module includes a DC power supply and a data storage.

In the third preferred technical solution provided by the utility model, the metering module is an electric energy metering chip of model AT7022D.

In the fourth preferred technical solution provided by the utility model, the communication module includes an RS485 interface and an expansion interface; the expansion interface can be inserted into a PLC unit or a micropower wireless unit according to communication requirements.

In the fifth preferred technical solution provided by the utility model, the housing is provided with a display device for displaying the collected parameters and an auxiliary terminal for collecting data; the display device is connected to the MCU module, and the auxiliary terminals are respectively connected to the The metering module, the sensor module and the communication module are connected.

In the sixth preferred technical solution provided by the utility model, the MCU module is a chip of model ATXmega32A4.

In the seventh preferred technical solution provided by the utility model, the data memory is a chip with a model number of AT24C64.

In the eighth preferred technical solution provided by the utility model, the PLC unit is a chip of model 74HTC244, and the micropower wireless unit is a chip of model CC1100.

In the ninth preferred technical solution provided by the utility model, the display device is a 2048-color liquid crystal display with a size of 3.5 inches.

Compared with the existing technology, the technical solution provided by the utility model can not only realize the display of various electric energy information according to the actual needs of energy efficiency evaluation, but also realize the safe, stable and reliable transmission of various interfaces, so that the energy efficiency harmonic The real-time collection and transmission of power-type data becomes possible, especially the real-time collection of the 2nd to 19th harmonics, which solves the disadvantage of high cost in the application of smart meters, is suitable for comprehensive promotion, and can provide accurate energy efficiency basis for energy efficiency data centers data to provide technical support for energy-saving policies; in addition, the terminal also fully considers the needs of different working environments, such as the communication mode can choose micro-power wireless or PLC signal transmission, and leave an expansion interface for the future master station to achieve intelligent control; Moreover, the acquisition terminal has strong anti-interference ability, and the electromagnetic shielding layer adopted has a perfect and careful electromagnetic compatibility design, which can prevent the acquisition terminal from electromagnetic interference when operating in harsh environments such as high and low temperature, high pressure and high humidity, and also has perfect Sophisticated three-level lightning protection measures.

Description of drawings

Figure 1 is a schematic diagram of the internal structure of a harmonic power type energy efficiency collection terminal.

Fig. 2 is a schematic diagram of the front part of the acquisition terminal shell.

Fig. 3 is a schematic view of the rear and side of the acquisition terminal housing.

Figure 4 is a schematic diagram of the auxiliary terminals.

Figure 5 is a remote local schematic diagram of the RS485 interface.

Figure 6 is a remote local schematic diagram of a PLC unit and a micropower wireless unit.

Detailed ways

As shown in Figures 1 to 4, the harmonic power type energy efficiency collection terminal collects the phase voltage, phase current and neutral line current analog quantities of the voltage sensor and current sensor, and obtains the power, power factor and frequency through the calculation and processing of the metering chip. , harmonics and electric energy and other information. The micro control unit (MCU) realizes data operation storage and management, and then realizes uplink communication through RS485 interface, PLC or micro-power wireless.

The harmonic power type energy efficiency acquisition terminal includes a shell, and the shell is provided with a display device for displaying collected parameters and an auxiliary terminal for collecting data; the display device is connected to the MCU module, and the auxiliary terminals are respectively connected to the The metering module, the sensor module are connected with RS485 interface, PLC module or micro-power wireless module.

Wherein the metering chip is AT7022D electric energy metering chip.

Described micro control unit (MCU) module is the core of whole terminal, and described MCU module is the chip that model is ATXmega32A4; Described MCU module records following event and following function: voltage/current curve, power curve, harmonic curve , cross-month settlement, electric energy freeze, harmonic power curve, harmonic over-limit event, ABC current/voltage deviation over-limit event record, power-on, power-off, zero reset, phase failure, time calibration, and voltage loss/current loss event.

Wherein, the harmonic curve refers to the 2-19th harmonic and the total harmonic distortion rate THDU of voltage and the total harmonic distortion rate THDI of current;

The power-off refers to the working condition in which the three-phase voltages are all lower than the critical voltage of the electric energy meter, and the load current is not greater than 5% of the rated current.

The voltage loss refers to that in the three-phase power supply system, the load current of a certain phase is greater than the starting current, but the voltage of the voltage line is lower than 78% of the reference voltage of the electric energy meter, and the duration is longer than 1 minute.

The current loss means that in a three-phase power supply system, the three-phase voltage is greater than the critical voltage of the electric energy meter, any phase or two phases of the three-phase current are less than the starting current, and the load current of other phase lines is greater than 5% of the rated current. condition.

The electric energy freezing event refers to the notification of the currently frozen electric energy.

For the voltage/current curve, power curve, month-to-month settlement, harmonic power curve, harmonic over-limit event, ABC current/voltage deviation over-limit event, power-on, power-off, zero reset, phase failure and time calibration The records are in compliance with the following national standards: GB12326-2000 standard, GB12325-2003 standard, GB/T 14549-1993 standard, and GB/T 15945-1995 standard.

As shown in Figures 5 and 6, the communication module uses one of the RS485 interface, micropower wireless unit or PLC unit, wherein the RS485 interface is used as the standard configuration interface of the instrument, and the micropower wireless module and PLC module are designed to be pluggable In the form of extended interface, the same interface standard is used on the instrument, so that the corresponding communication module can be used according to different environments and costs.

Wherein, the PLC unit is a chip of model 74HTC244; the micropower wireless unit is a chip of model CC1100.

The specifications of the CC1100 chip are: working frequency band: 402-470mhz; micro-transmission power: maximum transmission power 10mw; sleep current <10ua; the CC1100 chip supports high-precision temperature-compensated crystals, and can perform multiple channels such as 8/16/32 Channel selection and has multiple user interfaces such as rs232/rs485/uart interface, and supports communication rates such as 1200/2400/4800/9600/19200/38400bps, supports communication formats such as 8n1 and 8e1, and can automatically and quickly complete receiving/sending Mode switching, user-friendly.

The harmonic power type energy efficiency acquisition terminal is designed in an intensive manner combining soft clock and network time synchronization, which reduces hardware structure complexity and power consumption, and makes the working environment temperature, humidity, and atmospheric pressure meet the standards of the power consumption information acquisition system; In order to reduce device cost, an on-chip clock can be used.

The harmonic power type energy efficiency acquisition terminal adopts PT power supply mode, which makes the equipment structure and terminal arrangement compact. The power supply test objects are three-phase three-wire and three-phase four-wire circuits, and also include high-voltage measurement objects. Generally, three-phase three-wire power supply is considered. , the allowable error change limit caused by the supply voltage changing within the specified working range meets the relevant requirements of GB/T17215.301-2007.

Among them, the allowable error range, the allowable error change value caused when the voltage changes within the range of 0.8Un ~ 0.9Un and 1.1Un ~ 1.15Un, does not exceed 3 times the limit of the allowable error change value within the specified working range, when the voltage When the voltage is lower than 80% of the rated voltage, the error of the energy meter varies within the range of +10% to -100%.

Wherein, for the data collection and storage, since the collection terminal is not used for billing and metering, the collection accuracy is in accordance with the B-level precision of the equipment. Or the accuracy of the acquisition terminal reaches (GB/T17215.321-2008/IEC 62053-21:2003) not less than level 2 accuracy. The default time interval for curve record copying is 15 minutes, and it can be set flexibly; according to the size of the collected data, select the appropriate memory size.

Wherein, what described data memory uses is the chip that model is AT24C64; Said memory can store curve data and event data respectively; Multiplied by 7 times 96 = 342K bytes; the event data is: a total of 20 kinds of events are stored, 10 records of each event, each event 20 bytes, a total of 20 times 10 times 20 = 4K bytes.

The shell of the harmonic power type energy efficiency collection terminal is coated with an electromagnetic shielding layer, the electromagnetic shielding layer is formed by a conductive polymer layer, and the conductive polymer layer can be a soluble or dispersible material, such as polyaniline , polythiophene and polyparaphenylene; the conductive polymer layer is preferably made of polyethylenedioxythiophene.

The size of the harmonic power type energy efficiency acquisition terminal can be: length 260mm to 270mm, width 165mm to 175mm, height 70mm to 80mm; the most preferred size is: length 265mm, width 170mm, height 75mm.

It should be declared that the content and specific implementation of the utility model are intended to prove the practical application of the technical solutions provided by the utility model, and should not be interpreted as limiting the protection scope of the utility model. Under the inspiration of the spirit and principle of the present utility model, those skilled in the art may make various modifications, equivalent replacements, or improvements. But these changes or modifications are all within the protection scope of the pending application.

Claims (10)

1. harmonic wave electric weight type efficiency acquisition terminal; Said acquisition terminal comprises: shell, MCU module, the sensor assembly and the power storage module that are connected respectively with said MCU module; It is characterized in that the metering module and the communication module that are connected respectively with said MCU module; Above-mentioned whole module all is arranged in the said shell.

2. acquisition terminal according to claim 1 is characterized in that said sensor assembly comprises flow sensor, humidity sensor, pressure transducer, temperature sensor; Said sensor assembly is transferred to said MCU module with the parameter of gathering.

3. acquisition terminal according to claim 1 is characterized in that, said power storage module comprises direct supply and data-carrier store.

4. acquisition terminal according to claim 1 is characterized in that, said metering module is the electric energy computation chip of model AT7022D.

5. acquisition terminal according to claim 1 is characterized in that said communication module comprises RS485 interface and expansion interface; Said expansion interface can insert PLC unit or micropower radio-cell according to communication requirement.

6. acquisition terminal according to claim 1 is characterized in that, said shell is provided with the display device that shows the parameter collect and the auxiliary terminal of image data; Said display device is connected with said MCU module, and said auxiliary terminal is connected with said metering module, said sensor assembly and said communication module respectively.

7. acquisition terminal according to claim 2 is characterized in that, said MCU module is that model is the chip of ATXmega32A4.

8. acquisition terminal according to claim 3 is characterized in that, said data-carrier store is that model is the chip of AT24C64.

9. acquisition terminal according to claim 5 is characterized in that, said PLC unit is that model is the chip of 74HTC244, and said micropower radio-cell is that model is the chip of CC1100.

10. acquisition terminal according to claim 6 is characterized in that, said display device is 2048 dichroic liquid crystal display screens, and size is 3.5 inches.

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