CN212379553U

CN212379553U - Loop state monitoring and load data recording device based on rs485 interface of electric energy meter

Info

Publication number: CN212379553U
Application number: CN202020843882.9U
Authority: CN
Inventors: 何兆磊; 林聪�; 朱梦梦; 王浩; 赵静; 沈鑫; 余恒洁; 代盛国; 孙黎敏; 李亚林; 朱全聪
Original assignee: Yunnan Power Grid Co Ltd
Current assignee: Yunnan Power Grid Co Ltd
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2021-01-19
Anticipated expiration: 2030-05-20

Abstract

The utility model relates to a return circuit state monitoring and load data logging device based on electric energy meter rs485 interface belongs to data acquisition device technical field. The utility model comprises an MCU processor, a data reading module, a data storage module, a small uninterrupted power supply, a man-machine interaction module and an rs485 interface; MCU treater all with data reading module, data storage module, small-size uninterrupted power source, human-computer interaction module, rs485 interface connection, the rs485 interface of electric energy meter pass through rs485 bus with the utility model discloses an rs485 interface connection, the utility model discloses an rs485 interface is connected with data reading module, and the auxiliary power source interface of electric energy meter, terminal power supply auxiliary interface all are connected with small-size uninterrupted power source, and small-size uninterrupted power source still is connected with external power source. The utility model discloses can discern that data is unusual and acquire the discrete load data of high fineness degree during the trouble.

Description

Loop state monitoring and load data recording device based on rs485 interface of electric energy meter

Technical Field

The utility model relates to a return circuit state monitoring and load data logging device based on electric energy meter rs485 interface belongs to data acquisition device technical field.

Background

Voltage anomaly faults are common among metering device faults because of complexity. Direct lightning, inductive lightning, overvoltage of lines caused by short circuit and ground fault of low-voltage side lines, short circuit and ground fault of high-voltage lines, secondary circuit fault of a voltage transformer and the like can cause damage of the voltage transformer or fusing of a high-voltage fuse. The process of finding the voltage fault in the actual operation and maintenance process is a complex process, and the voltage value during the fault period of the voltage loop may be a sudden change, a variable value and an aperiodic process, so that the difficulty of calculating the fault electric quantity is increased. The power supply bureau metering operation and maintenance team often handles voltage loop undervoltage faults (including three-phase voltage loss) mainly caused by burning damage of a mutual inductor and fuse.

In actual metering fault processing work, data during fault is particularly important as the only basis for compensation, but is limited by the limitations of the existing devices and automation systems, and the data during fault which can be obtained by the users cannot well reflect the actual load condition, wherein: 1) the sampling interval of a load curve of the electric energy meter is set to be 15min conventionally, the interval is too large, the description is too rough for the load changing at any moment, the design of an internal memory of the electric energy meter is too small, and the storage space is seriously insufficient; 2) the three-phase voltage loop faults, undervoltage and voltage loss cause the equipment to stop working due to power failure, and the period is data-free. In the type of measurement fault electric quantity compensation work, the electric quantity of the voltage value abnormal phase is compensated, particularly when the three-phase voltage loss fault occurs, because the fault period data is lack. At present, the failure time is mainly checked by a four-in-one main station system, the failure electric quantity is mainly checked by taking the failure time as a main basis, and the follow-up is carried out by referring to the average load in normal operation in the past.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the utility model provides a return circuit state monitoring and load data logging device based on electric energy meter rs485 interface to this identification data is unusual and acquire the discrete load data of the high fineness degree during the trouble.

The utility model adopts the technical scheme that: a loop state monitoring and load data recording device based on an rs485 interface of an electric energy meter comprises an MCU (microprogrammed control Unit) processor, a data reading module, a data storage module, a small uninterrupted power supply, a human-computer interaction module and the rs485 interface;

the MCU processor is connected with the data reading module, the data storage module, the small uninterrupted power supply, the human-computer interaction module and the rs485 interface, the rs485 interface of the electric energy meter is connected with the rs485 interface of the load data recording and storing device based on loop state monitoring of the rs485 interface of the electric energy meter through the rs485 bus, the rs485 interface of the loop state monitoring and load data recording and storing device based on the rs485 interface of the electric energy meter is connected with the data reading module, the auxiliary power supply interface of the electric energy meter and the auxiliary interface of the terminal power supply are connected with the small uninterrupted power supply, and the small uninterrupted power supply is further connected with the external power supply.

Furthermore, the MCU processor is used for controlling the data reading module to realize reading of data in the intelligent electric energy meter, and judging whether the data is abnormal according to a set threshold value; meanwhile, the data storage module, the small uninterrupted power supply and the human-computer interaction module are controlled;

the data storage module consists of an SD and a control chip, is used for converting the data of the MCU processor into a txt format and storing the txt format in a U disk, is provided with a time mark, is convenient for data processing in the later period, is just like a data black box, and constantly monitors and records the loop data collected by the electric energy meter;

the small uninterrupted power supply is used for converting a 220V operating power supply or an auxiliary power supply into a 12V voltage-stabilized direct-current power supply, automatically charging the storage battery, and reversely converting the operation power supply or the auxiliary power supply into an uninterrupted power supply for the electric energy meter to use, when equipment and loop faults occur, the electric energy meter is ensured not to be powered off before fault processing and normally operates, the storage battery is composed of a polymer lithium battery, and the capacity of the storage battery ensures that the electric energy meter continuously works for 96 hours under the condition of power failure;

the man-machine interaction module comprises a liquid crystal display screen and a key input, wherein the liquid crystal display screen is used for displaying data contents and is convenient to browse; the key input is used for parameter setting and device operation.

The utility model has the advantages that:

1. the rs485 port data reading function of the electric energy meter is used for reading current, voltage and power factor data which are acquired by the electric energy meter per se and have certain precision at a higher frequency, analyzing and comparing the acquired data, starting a quick recording function when abnormality is found, such as undervoltage, voltage loss and overvoltage, marking time marks on the read data, and then storing the data on a storage card in a text form, so that data extraction is facilitated; the device is not used for increasing current and voltage data of a sensor acquisition loop, and high-precision load data acquired by the electric energy meter is skillfully used.

2. The device has the function of an uninterruptible power supply, and can be used as an auxiliary power supply for the operation of the electric energy meter under the conditions of three-phase voltage loss and undervoltage power failure, so that the continuous normal operation of the electric energy meter is ensured.

Drawings

FIG. 1 is a schematic diagram of the principle structure of the present invention;

fig. 2 is a schematic diagram of the connection of the device according to the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1: as shown in fig. 1-2, a loop state monitoring and load data recording device based on an rs485 interface of an electric energy meter comprises an MCU processor, a data reading module, a data storage module, a small uninterruptible power supply, a human-computer interaction module, and an rs485 interface;

the MCU processor is connected with the data reading module, the data storage module, the small uninterrupted power supply, the human-computer interaction module and the rs485 interface, the rs485 interface of the electric energy meter is connected with the rs485 interface of the load data recording and storing device based on loop state monitoring of the rs485 interface of the electric energy meter through the rs485 bus, the rs485 interface of the loop state monitoring and load data recording and storing device based on the rs485 interface of the electric energy meter is connected with the data reading module, the auxiliary power supply interface of the electric energy meter and the auxiliary interface of the terminal power supply are connected with the small uninterrupted power supply, and the small uninterrupted power supply is further connected with the external power supply. Fig. 2 is a schematic diagram of the connection of the device when the present invention is applied, in which the connections of the electric energy meter, the terminal, the junction box and the secondary circuit are all conventional connections for those skilled in the art.

The utility model discloses a theory of operation is: the MCU processor is used for reading the data of the three-phase multifunctional electric energy meter unit through rs485 and carrying out data processing and storage, whether the loop is abnormal or not is indirectly judged, in order to enable the field use to be more convenient and the man-machine interaction to be more friendly, the liquid crystal display and the keys are used for data display and control, and comprehensive information such as electric energy, voltage, current and the like can be visually read. The data is stored as txt files which can be identified by a computer, normal data and abnormal data are separately established and stored in files, and reading is more convenient. The small uninterrupted power supply provides a stable and reliable power supply for the whole equipment, and the equipment is provided with a common interface, is matched with a special line and is convenient to install and use on site.

For further explaining the function of the MCU processor, the following explanation is made, and the data processing mode may be: and if the voltage value of the normal voltage loop is 57.7V +/-3V, if the set threshold value is 50V, when the voltage is lower than 50V, the loop is judged to be under-voltage abnormal, and at this time, a rapid data recording function is started. The system comprises a data storage module, a small uninterrupted power supply and a human-computer interaction module, wherein the data storage module, the small uninterrupted power supply and the human-computer interaction module are controlled simultaneously; for example, whether data are stored rapidly or not is specifically controlled, load data are read once through an rs485 port every 5-8 seconds, if the data are within a threshold range, a group of load data are stored for 20 times, if the data are abnormal, current data are stored, whether the small uninterrupted power supply supplies power to the electric energy meter and the terminal or not is controlled, the man-machine interaction module is controlled to display the data, and information input by the keys is received, so that comprehensive information such as electric energy, voltage and current is visually read.

Wherein, as the utility model discloses a further explanation, do not have the content of this part as follows and do not influence the realization of this application yet, whether MCU treater reading data can adopt the conventional technological means in this application in this field to realize according to setting for the threshold judgement data, and the principle can adopt following mode to go on:

step one, the MCU processor controls a data reading module to read current and voltage data collected by the electric energy meter and in a voltage loop;

step two, judging whether the three phases of the electric energy meter have voltage or not according to the read voltage data in the voltage loop; if the voltage data in the voltage loop is not zero, judging that the voltage loop has voltage, and executing the step three; if the voltage data in the voltage loop is zero, judging that the voltage loop is out of voltage, and executing the step four;

step three, if voltage exists in the voltage loop, comparing voltage data in the voltage loop with a threshold value, and if the three-phase voltage is greater than the threshold value, indicating that the loop state is normal; if one or more phases of the three-phase voltage are lower than a set value, the PT is abnormal;

if the voltage loop is in voltage loss, judging whether current exists according to current data in the current loop; if the current data in the current loop is not zero, judging that the current exists in the current loop, and indicating that power failure does not exist and the voltage of the electric energy meter is lost due to the fact that the three-phase PT is damaged;

if the current data in the current loop is zero, judging that the current loop has no current, indicating that the state is normal, and considering that the line has power failure.

The utility model discloses rs485 mouths of rs485 mouth and electric energy meter based on the loop state monitoring of electric energy meter rs485 interface and load data record device are connected, and uninterrupted power source inserts electric energy meter and terminal power supply auxiliary interface, electric energy meter terminal normal operating when ensureing the decompression trouble.

While the present invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a return circuit state monitoring and load data logging device based on electric energy meter rs485 interface which characterized in that: the system comprises an MCU processor, a data reading module, a data storage module, a small uninterrupted power supply, a human-computer interaction module and an rs485 interface;

2. The loop state monitoring and load data recording device based on the rs485 interface of the electric energy meter as claimed in claim 1, wherein:

the MCU processor is used for controlling the data reading module to realize reading of internal data of the intelligent electric energy meter, and judging whether the data is abnormal or not according to a set threshold value; meanwhile, the data storage module, the small uninterrupted power supply and the human-computer interaction module are controlled;