CN202421315U - Intelligent electric power measuring and controlling instrument - Google Patents

Abstract

The utility model relates to an intelligent electric power measuring and controlling instrument which is characterized in that input ends of a three-phase current transformer and a three-phase voltage transformer are connected with a three-phase bus; the output end of the three-phase voltage transformer and the output end of the three-phase current transformer are both connected with an electric energy metering chip; the electric energy metering chip is provided with two output ends; one output end is a pulse output end; the other output end is connected with a microcomputer processor; the output end of the microcomputer processor is respectively connected with a display screen and a host computer through an RS485 communication module; and a PC (Personal Computer) device for programming the microcomputer processor is in data connection with the microcomputer processor. After the technical scheme is adopted, current and voltage signals can be quickly real-time monitored because an MCU (Micro Controller Unit) and a special metering chip are adopted; the structure is relatively simple; a voltage source circuit is added, thus a 220v power supply is autonomously supplied to the intelligent electric power measuring and controlling instrument; and meanwhile, the PC device is introduced for performing the changeable programming on the MCU, thus the requirements under different conditions are met.

Description

An intelligent power measurement and control instrument

technical field

The utility model belongs to an intelligent electric power measurement and control instrument, in particular to an intelligent electric power measurement and control instrument.           

Background technique

At present, in the field of electric power, during the process of power transmission to the power grid, the parameters of the voltage and current of the power grid need to be monitored in real time to ensure that the staff can accurately and real-time understand the power transmission situation. However, some electrical measuring devices currently on the market either measure current or voltage independently, and cannot perform comprehensive collection and monitoring. There are also some multifunctional monitoring devices, but the design is too complicated, and the auxiliary function is single, and the cost is high, which causes a lot of inconvenience for users.

Contents of the invention

The technical problem to be solved by the utility model is to provide an intelligent power measurement and control instrument with simple structure, diversified functions, and the ability to simultaneously monitor current and voltage signals in real time.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

An intelligent electric power measurement and control instrument is characterized in that: the device connects the input terminals of the three-phase current transformer and the three-phase voltage transformer to the three-phase bus bar, and the output terminal of the three-phase voltage transformer and the three-phase current transformer The output ends of the electric energy metering chip are all connected to the electric energy metering chip. The electric energy metering chip has two output ends, one is the pulse output end, and the other output end is connected to the microcomputer processor, and the output ends of the microcomputer processor are respectively connected to the display The screen and the upper computer are connected through the RS485 communication module, and a PC for programming the microcomputer processor is connected with the data of the microcomputer processor.

The output end of the three-phase voltage transformer is connected to a voltage power circuit, and the voltage power circuit is electrically connected to the device.

The pulse output terminal of the electric energy metering chip is connected to an alarm, a humidity device or a temperature device.

The electric energy metering chip adopts ATT7030A special metering chip.

Described microcomputer processor adopts the MCU of 68HC908LJ12 model.

After adopting the above technical solutions: due to the use of MCU and special metering chips, the current and voltage signals can be monitored quickly and in real time, and the structure is relatively simple. With the addition of a voltage power supply circuit, a 220V power supply is independently provided to act on the device , At the same time, the PC is introduced to modify the programming of the MCU, which can meet the needs of different situations.

Description of drawings

Figure 1 is a structural block diagram of the utility model;

Figure 2 is a circuit diagram of the utility model voltage and current collection.

Detailed ways

Referring to Figure 1, an intelligent power measurement and control instrument connects the input terminals of the three-phase current transformer and the three-phase voltage transformer to the three-phase busbar, and the output terminals of the three-phase voltage transformer and the output terminals of the three-phase current transformer are both Connect to the power calculation chip, see Figure 2 for the specific voltage and current acquisition circuit diagram, the power metering chip has two output terminals, one is the pulse output terminal, and the other output terminal is connected to the microcomputer processor, and the output terminals of the microcomputer processor are respectively connected to the It is connected to the display screen and the upper computer through the RS485 communication module, and a PC for programming the microcomputer processor is connected with the data of the microcomputer processor. The output terminal of the three-phase voltage transformer is connected to a voltage power circuit, and the voltage power circuit is electrically connected with the device. The display screen is a blue-screen backlit LCD display, and the pulse output terminal of the electric energy metering chip is connected to an alarm, humidity device or temperature device. A multi-functional interface is provided here to facilitate the needs in different situations.

Models that can be used for specific components: ATT7030A special metering chip is used for the electric energy metering chip. Microcomputer processor adopts 68HC908LJ12MCU.

The working principle of the utility model:

(1) Through the current and voltage transformer, the signal can be directly connected from the current and voltage transformer;

(2) The PT/CT ratio can be set arbitrarily through the PC;

(3) Modular design of pulse output terminal, relay alarm output, 4-20mA analog quantity and other functions. The analog quantity output of pulse output terminal can provide up to 2 channels of 4-20mA output. 26 electric power (UA, UB, UC, UAB, UBC, UCA, IA, IB, IC, PA, PB, PC, P total, QA, QB, QC, Q total, SA, SB, SC, S total, PFA , PFB, PFC, PF, F) The isolated transmission output is a DC signal of 0-20mA or 4-20mA.

(4) Different addresses can be set for multiple instruments;

(5) MCU can communicate with SCADA and PLC systems; it can communicate with various software in the industry (Intouch, Fix, Citec, configuration network, etc.);

(6) The display screen is a blue screen backlit LCD display with high visibility;

(7) Easy to install, simple wiring, small amount of work;

(8) The instrument adopts a special power-off protection circuit. In the case of power failure, the data will not be lost. After the power is restored, the instrument will continue to run;

(9) Four-quadrant electric energy metering, time-of-use billing, maximum demand record and 12-month electric energy statistics. the

(10) The voltage power supply circuit is electrically connected with the device, and provides a 220V auxiliary power supply independently.

(11) Safety performance: Power frequency withstand voltage, AC2kV/1min between power supply, voltage input circuit, and current input circuit; AC1.5kV/1min between power supply and switch input circuit, communication circuit, and transmission output circuit, Insulation resistance: input and output terminals to the chassis>5MΩ.

Claims (5)

1. intelligent electric power measure and control instrument; It is characterized in that: this device inserts three-phase bus for the input end of threephase current transformer and threephase potential transformer; The output terminal of said threephase potential transformer and the output terminal of threephase current transformer all insert electric energy computation chip; Said electric energy computation chip is provided with two output terminals, and one is pulse output end, and another output termination is to computer processor; The output terminal of said computer processor connects respectively to display screen with through the RS485 communication module and connects to host computer, and a PC that is used for computer processor is programmed connects with the computer processor data.

2. a kind of intelligent electric power measure and control instrument according to claim 1 is characterized in that: the output termination of said threephase potential transformer is to a voltage source loop, and said voltage source loop is electrically connected with this device.

3. a kind of intelligent electric power measure and control instrument according to claim 1 and 2, it is characterized in that: the pulse output end of said electric energy computation chip connects to warning horn, hygroscope or protractor.

4. a kind of intelligent electric power measure and control instrument according to claim 1 and 2 is characterized in that: said electric energy computation chip adopts the special-purpose computation chip of ATT7030A.

5. a kind of intelligent electric power measure and control instrument according to claim 1 and 2 is characterized in that: said computer processor adopts the MCU of 68HC908LJ12 model.

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