CN214951505U

CN214951505U - Multifunctional passive wireless single-phase cable monitoring device based on CT power taking

Info

Publication number: CN214951505U
Application number: CN202121246187.5U
Authority: CN
Inventors: 李正恒; 郑暾麟; 邓存孝
Original assignee: Zhuhai Blackstone Electricity Automation Science & Technology Co ltd
Current assignee: Zhuhai Blackstone Electricity Automation Science & Technology Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-11-30
Anticipated expiration: 2031-06-04

Abstract

The utility model discloses a passive wireless single-phase cable multifunctional monitoring device based on CT electricity taking, which comprises a front-end sensor, a wireless transmission unit and a terminal display device; the wireless transmission unit comprises a 433MHz wireless chip, a wireless balun and an antenna, wherein the 433MHz wireless chip, the wireless balun and the antenna are sequentially connected; the front-end sensor comprises a power management module and a data acquisition module; the terminal display device comprises a power supply module, a data processing module and an LCD touch screen; the front-end sensor is connected with the terminal display device through the wireless transmission unit. The utility model discloses a mainly constitute by front end sensor and terminal display device two parts, have technical advantage such as multi-functional monitoring, data integrated analysis, passive wireless monitoring, big data analysis.

Description

Multifunctional passive wireless single-phase cable monitoring device based on CT power taking

[ technical field ] A method for producing a semiconductor device

The utility model relates to a temperature, the current monitoring technology field of single-phase cable specifically are a passive wireless single-phase cable multifunctional monitoring device based on CT gets electricity.

[ background of the invention ]

The cable is in places such as industry, agriculture, chemical industry, district indispensable material, because through reasons such as electric current is big, humidity, ageing, corruption, screw are not hard up, leads to the joint department of cables such as block terminal, cubical switchboard to generate heat, even burns out, causes loss of property. In order to prevent similar events, preventive measures are required to remind technicians to perform timely maintenance.

Adopt more than solution scheme at present to places such as large-scale distribution stifle, power plant and monitor cable joint's temperature, generally adopt temperature measurement modes such as active wireless temperature measurement of mode, passive wireless temperature measurement, optic fibre temperature measurement, send alarm information at cable joint temperature exceedes the limit value, nevertheless these temperature measurement modes all have the defect of different degrees:

the monitoring parameters are single, the temperature of the joint is mainly detected at present, and the inspection and maintenance are only carried out when the temperature exceeds the limit.

Secondly, the installation and wiring are complex, and temperature measurement optical fibers are laid at the measured point for measuring the temperature of the optical fibers;

the real-time performance is poor, the active wireless temperature measurement mode adopts the battery to supply power, and in order to prolong the service life of the battery, temperature data must be sent for one time in ten minutes or more, so that the temperature overrun alarm is delayed.

[ Utility model ] content

In order to solve the defect of storage in the above-mentioned temperature measurement mode, the utility model provides a technical scheme is a device to the temperature, electric current, the environmental temperature and humidity simultaneous monitoring of cable joint department to according to the quality condition in the monitoring data analysis aassessment cable use, and give alarm information. The device mainly comprises a front-end sensor and a terminal display device, and has the technical advantages of multifunctional monitoring, data comprehensive analysis, passive wireless monitoring, big data analysis and the like.

The utility model provides a following technical scheme:

a passive wireless single-phase cable multifunctional monitoring device based on CT electricity taking comprises a front-end sensor, a wireless transmission unit and a terminal display device;

the wireless transmission unit comprises a 433MHz wireless chip, a wireless balun and an antenna, wherein the 433MHz wireless chip, the wireless balun and the antenna are sequentially connected;

the front-end sensor comprises a power management module and a data acquisition module;

the terminal display device comprises a power supply module, a data processing module and an LCD touch screen;

the front-end sensor is connected with the terminal display device through a wireless transmission unit.

Further, in the front-end sensor, the power management module comprises a CT power-taking coil, a voltage-multiplying rectifying circuit, an energy-storing capacitor and a DC/DC conversion circuit, and the CT power-taking coil, the voltage-multiplying rectifying circuit, the energy-storing capacitor and the DC/DC conversion circuit are connected in sequence;

the data acquisition module comprises a wireless MCU unit A, a temperature and humidity sensor, a current detection unit and an NTC temperature sensor; the wireless MCU unit A is respectively connected with the temperature and humidity sensor, the current detection unit and the NTC temperature sensor;

and the wireless MCU unit A is connected with the 433MHz wireless chip.

Further, in the terminal display device, the power supply module comprises a 220V AC power supply, an AC/DC power supply module and an LDO power supply; the 220V AC power supply, the AC/DC power supply module and the LDO power supply are sequentially connected;

the data processing module comprises a wireless MCU unit B, an audible and visual alarm and an RS485 communication unit; the wireless MCU unit B is respectively connected with the sound-light alarm, the RS485 communication unit and the LCD touch screen;

and the wireless MCU unit B is connected with the 433MHz wireless chip.

And furthermore, an optical solid-state relay is arranged between the wireless MCU unit A and the current detection unit, and the wireless MCU unit A samples current sampling resistance data by controlling the optical solid-state relay.

The utility model relates to a passive wireless single-phase cable multifunctional monitoring device based on CT electricity-taking, which is characterized in that a front end sensor obtains energy enough to normally work by the CT electricity-taking mode, detects the temperature, the current and the environment temperature and humidity of a cable joint, and transmits a monitoring value to a terminal display device in a 433MHz wireless mode after carrying out digital filtering processing on a detection value; after receiving the monitoring data, the terminal display device performs comparison analysis according to a fixed data model (empirical software algorithm), immediately sends out early warning or alarm information if an abnormal condition occurs, and simultaneously pushes the data to a background in an RS485 mode so as to perform big data analysis. The device has the following technical advantages:

monitoring parameter diversity: simultaneously monitoring the temperature, the current and the environment temperature/humidity of the cable joint;

secondly, the power is not provided: the front-end sensor does not need a battery or other power supply for power supply;

and thirdly, wireless transmission: the front-end sensor transmits in a 433MHz wireless mode without arranging a communication line;

fourthly, comprehensive analysis: comprehensively analyzing main reasons of cable joint heating through various monitoring data, and early warning treatment is carried out in advance;

analyzing big data: the background collects, stores and analyzes the data of each node, a historical curve is drawn according to time schedule, fault conditions can be pre-judged in advance through curve analysis, and a basis is provided for maintenance.

[ description of the drawings ]

FIG. 1 is a flow chart of the linking relationship between functional modules of the present invention;

fig. 2 is a circuit diagram of the front-end sensor of the present invention;

fig. 3 is a circuit diagram of the terminal display device of the present invention;

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

and the wireless MCU unit A is connected with the 433MHz wireless chip.

and the wireless MCU unit B is connected with the 433MHz wireless chip.

The specific working principle of the front-end sensor is as follows:

energy acquisition: the method comprises the steps that alternating current voltage is obtained through a CT electricity taking coil, the alternating current voltage is converted into direct current voltage through a voltage doubling rectifying circuit and stored in 3 220uF energy storage capacitors, and when the voltage of the energy storage capacitors exceeds 5.5V (according to a value obtained by debugging), the voltage of the DC/DC is reduced to 3.3V to be used by a wireless MCU unit A, a 433MHz wireless chip, a sensor and the like;

collecting data: when the voltage of the energy storage capacitor is lower than 3.3V, the energy storage capacitor is cut off to discharge and is converted into an energy storage state. After the wireless MCU unit A is started, firstly, carrying out temperature acquisition on the NTC temperature sensor; sampling the current sampling resistance data by controlling the optical solid-state relay, and calculating a current value; and finally, reading the data of the temperature and humidity sensor through an I2C bus.

And thirdly, wireless transmission: after each data that wireless MCU unit A will gather carries out digital filtering and handles, give wireless chip with data transmission through the SPI mode, give terminal display device through 433MHz wireless chip transmission.

The specific working principle of the terminal display device is as follows:

power supply: the device adopts AC220V power supply, obtains a stable 3.3V power supply after being converted by an AC/DC power supply module, and respectively supplies power to the wireless MCU unit B, the audible and visual alarm, the RS485 communication unit, the LCD display screen and the like;

secondly, wireless receiving: when the wireless chip receives monitoring data sent by the front-end sensor, an interrupt mode is started immediately to call the MCU B, and the data are transmitted to the MCU B for processing in an SPI mode;

processing data: and the MCU unit B compares the newly acquired data with the fixed data model, immediately starts an audible and visual alarm if the data are abnormal, and provides maintenance personnel for overhauling.

LCD shows: the method is realized by adopting a 3.5-inch touch TFT LCD, and the temperature, the current and the ambient temperature and humidity values of each monitoring point are displayed in a list form by polling; it is also possible to modify device parameters through a touch screen.

RS485 communication unit: in order to realize big data analysis, the device transmits the received monitoring data to the background in time in an RS485 mode, and the background judges the maintenance and overhaul period and time through comprehensive analysis.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a multi-functional monitoring devices of passive wireless single-phase cable based on CT gets electricity which characterized in that: the monitoring device comprises a front-end sensor, a wireless transmission unit and a terminal display device;

2. The multifunctional monitoring device of passive wireless single-phase cable based on CT electricity taking of claim 1, characterized in that: in the front-end sensor, the power management module comprises a CT power taking coil, a voltage doubling rectifying circuit, an energy storage capacitor and a DC/DC conversion circuit, wherein the CT power taking coil, the voltage doubling rectifying circuit, the energy storage capacitor and the DC/DC conversion circuit are sequentially connected;

and the wireless MCU unit A is connected with the 433MHz wireless chip.

3. The multifunctional monitoring device of passive wireless single-phase cable based on CT electricity taking of claim 1, characterized in that: in the terminal display device, the power supply module comprises a 220V AC power supply, an AC/DC power supply module and an LDO power supply; the 220V AC power supply, the AC/DC power supply module and the LDO power supply are sequentially connected;

and the wireless MCU unit B is connected with the 433MHz wireless chip.

4. The multifunctional monitoring device of passive wireless single-phase cable based on CT electricity taking of claim 1, characterized in that: and an optical solid-state relay is arranged between the wireless MCU unit A and the current detection unit, and the wireless MCU unit A samples current sampling resistance data by controlling the optical solid-state relay.