CN211291786U - Drawer cabinet contact temperature acquisition device - Google Patents

Abstract

The utility model provides a drawer cabinet contact temperature acquisition device, drawer cabinet contact temperature acquisition device includes alternating current power supply input terminal, self-resuming fuse, piezo-resistor, filter circuit, wide voltage input range power module, TVS protection tube, filter capacitor, 433Mhz wireless transmitting circuit, 433Mhz antenna, MCU treater, work pilot lamp, warning pilot lamp, communication status pilot lamp, sensor acquisition circuit and NTC sensor access terminal. The utility model discloses a will combine the structure of low pressure drawer cabinet, possess overheated alarm indication function, possess simultaneously and upload display terminal's function through wireless communication mode with temperature information, the maintainer can suitably adjust maintenance operation plan and scheme according to the temperature variation condition to can master the in service behavior and the life of primary equipment in real time.

Description

Drawer cabinet contact temperature acquisition device

Technical Field

The utility model belongs to the technical field of the temperature acquisition technique and specifically relates to a drawer cabinet contact temperature acquisition device.

Background

The low-voltage switch cabinet is generally suitable for power users of power plants, substations, industrial and mining chemical enterprises and the like at present, and provides electric energy conversion, distribution and control for power, lighting and power distribution equipment.

In long-term load operation of the low-voltage switch cabinet, abnormal heat release occurs at positions such as switch connection positions, bus connection points, power cable connection points and the like due to aging, oxidation or poor contact to overlarge contact resistance values, particularly under the condition of large current, oxidation of the connection positions is accelerated, so that contact resistance is further increased, and vicious circle is caused. Because the low-voltage switch cabinet is strong in structural sealing performance and is in a relatively closed environment, heating parts such as a switch connection part, a bus connection point, a power cable joint and the like in the drawer cannot be timely, effectively and conveniently detected in real time, and can be accumulated along with time, so that serious consequences such as joint melting, low-voltage cabinet explosion and even electrical fire can be caused, and huge personal injuries and property losses can be caused. In view of the above circumstances, the problem of temperature monitoring is solved through the following temperature measurement modes at present, which are mainly divided into contact type and non-contact type temperature measurement, and an infrared temperature measurement technology is more common in non-contact type temperature measurement. However, infrared temperature measurement is susceptible to environmental factors (such as ambient temperature and dust in the air), and also has a large influence on temperature measurement readings of bright or polished metal surfaces, and meanwhile, the low-voltage cabinet has a narrow internal space and a relatively strict limitation on the appearance of a product. Contact has optic fibre temperature measurement, but optic fibre temperature measurement cost is high, and needs lead wire to cabinet body instrument room, to drawer type structure's low-voltage cabinet, just brings very big influence for the installation and overhaul, is unfavorable for popularization and application.

But in comparison, the contact type temperature measurement has higher precision and better stability than the non-contact type temperature measurement, and is easy to realize the real-time on-line monitoring requirement of the temperature.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical requirements of a current market application scene on contact type, miniaturization and wireless transmission of a drawer cabinet contact temperature acquisition device, the drawer cabinet contact temperature acquisition device has the core idea that data transmission between data and a display terminal is realized by using a wireless communication technology while a contact type temperature measurement mode is adopted, the reliability of temperature measurement is improved, and the workload of comprehensive wiring is reduced, so that the requirement of monitoring, developing and constructing the working state of power equipment is met.

A drawer cabinet joint temperature acquisition device comprises an alternating current power supply input terminal 1, a self-recovery fuse 2, a piezoresistor 3, a filter circuit 4, a wide voltage input range power supply module 5, a TVS protection tube 6, a filter capacitor 7, a 433Mhz wireless transmitting circuit 8, a 433Mhz antenna 9, an MCU processor 10, a work indicator lamp 11, an alarm indicator lamp 12, a communication state indicator lamp 13, a sensor acquisition circuit 14 and an NTC sensor access terminal 15, wherein the alternating current power supply input terminal 1 is accessed to the L/N end of alternating current commercial power AC220 +/-20 percent and accessed to the wide voltage input range power supply module 5 through the self-recovery fuse 2, the wide voltage input range power supply module 5 adopts an LS05-15B05SS model, the self-recovery fuse 2 adopts a 1A specification, the L/N two ends of the alternating current commercial power AC220 +/-20 percent are connected in parallel with a piezoresistor 10D K, the input primary overvoltage protection function is realized, and coupling capacitors are arranged between L/N of AC mains supply AC220V +/-20% and between an L end and an N end and the ground; the wide voltage input range power module 5 selects AC 86-265V, outputs 5V +/-0.02 and consumes 5W, and supplies power to the MCU processor 10, 433Mhz wireless transmitting circuit 8 and the sensor acquisition circuit 14 for use, the output stage of the power module 5 is provided with a TVS protection tube 6, a model SMAF06J05V bidirectional protection tube, the sensor acquisition circuit 14 mainly comprises an operational amplifier and a sampling divider resistor, the operational amplifier is used for NTC temperature sensor signal following, the sampling divider resistor is used for matching a high-precision sampling reference voltage value, the NTC temperature sensor is accessed into the sensor acquisition circuit 14 through an NTC sensor access terminal 15 and then transmits the processed signal to the MCU processor 10, the STM32G07 model processor is selected, and the processor is mainly responsible for NTC temperature signal calculation, out-of-limit temperature judgment, real-time temperature wireless delivery and operation state judgment; the MCU processor 10 is connected with the 433Mhz wireless transmitting circuit 8 and wirelessly transmits data to the display terminal through the antenna 9 by a frequency modulation mechanism; the MCU processor 10 lights up a work indicator lamp 11, an alarm indicator lamp 12 or a communication state indicator lamp 13 according to the working condition.

A drawer cabinet contact temperature collection device, comprising: the wide voltage input range power supply module supplies power to the MCU processor, the temperature sensor and acquisition circuit and the 433Mhz wireless transmission circuit, and the MCU processor is responsible for acquiring signals of the multiple temperature sensors, calculating and sending data to a display terminal through the 433Mhz wireless transmission circuit; the MCU processor selects STM32G07 series products; the model of the wide voltage input range power supply module is LS05-15B05SS, the voltage input range is AC 86-265V, the output is 5V +/-0.02, and the power consumption is 5W.

Utility model's beneficial effect:

the utility model discloses a will combine the structure of low pressure drawer cabinet, describe a section and be applicable to the temperature monitoring device of contact once, possess overheated warning instruction function, possess the function of uploading display terminal through wireless communication mode with temperature information simultaneously, the maintainer can suitably adjust maintenance operation plan and scheme according to the temperature variation condition, and can master the in service behavior and the life of primary equipment in real time, the demand of intelligent transformer substation development has been realized, also be the important component part of electric power thing networking development.

The device can expand the signal acquisition and processing of the 12-path NTC temperature sensor, effectively reduce the monitoring cost, bring possibility for the online monitoring of the temperature information of the electrical contact, and improve the feasibility of the floor of a project.

The utility model discloses an have that scheme design is reasonable, measuring function is complete, realize advantage such as the expense is few.

Drawings

Fig. 1 is a block diagram of a hardware circuit structure of a drawer cabinet contact temperature acquisition device:

fig. 2 is a schematic diagram of a junction temperature acquisition device of a drawer cabinet:

in the figure: the device comprises an alternating current power supply input terminal, a 2-self-recovery fuse, a 3-piezoresistor, a 4-filter circuit, a 5-wide voltage input range power supply module, a 6-TVS protection tube, a 7-filter capacitor, an 8-433Mhz wireless transmitting circuit, a 9-433Mhz antenna, a 10-MCU processor, an 11-work indicator light, a 12-alarm indicator light, a 13-communication state indicator light, a 14-sensor acquisition circuit and a 15-NTC sensor access terminal.

The specific implementation mode is as follows:

for the purposes of promoting an understanding and appreciation of the invention, the invention will be further described and illustrated in connection with the accompanying drawings.

As in fig. 1, embodiment 1, the utility model discloses a MCU treater, wide voltage input range power module, wireless transmitting circuit, status indication and sensor acquisition circuit constitute. The whole device comprises an acquisition device shell and an NTC temperature sensor. The PCB circuit board in the device installation shell in fig. 1 is equipped with wide voltage input range power module 5, multichannel temperature sensor acquisition circuit, MCU treater 10, 433Mhz wireless transmitting circuit 8 on the PCB circuit board, and the MCU treater is responsible for gathering multichannel temperature sensor signal, calculates and sends out data to display terminal through 433Mhz wireless transmitting circuit.

As shown in fig. 2, embodiment 2, the utility model discloses a drawer cabinet contact temperature collection system's alternating current commercial power AC220V 20%'s L/N inserts alternating current power input terminal 1 respectively, 2 access wide voltage input range power module 5 through the self-resuming fuse, select LS05-15B05SS model, 1A specification is selected to self-resuming fuse 2, alternating current commercial power AC220V 20%'s L/N both ends and connect piezo-resistor 10D471K, be used for realizing the elementary overvoltage protection function of input, reach the L end simultaneously between L/N, establish coupling capacitance between N end and the ground, be used for eliminating interference pulse signal. The wide voltage input range power module 5 selects AC 86-265V, outputs 5V +/-0.02, consumes 5W, supplies power for the MCU processor 10, 433Mhz wireless transmitting circuit 8, the sensor acquisition circuit 14 and the like, the TVS protection tube 6 is arranged at the output stage of the power module 5, the model SMAF06J05V bidirectional protection tube, the sensor acquisition circuit 14 mainly comprises an operational amplifier and a sampling divider resistor, the operational amplifier is used for NTC temperature sensor signal following, the sampling divider resistor is used for matching a high-precision sampling reference voltage value, the designed reference voltage is originated from the inside of the MCU processor 10, and the value is 1.65 VDC. NTC temperature sensor passes through NTC sensor access terminal 15 and inserts sensor acquisition circuit 14, and the signal that will handle is sent to MCU treater 10 again, chooses for use STM32G07 model treater, and MCU treater 10 is mainly responsible for NTC temperature signal calculation, off-limit temperature and judges, work such as the wireless outward transmission of real-time temperature, running state judgement.

The MCU processor 10 is connected with 433Mhz wireless transmitting circuit 8, and wirelessly transmits data to the display terminal through the antenna 9 by a frequency modulation mechanism. The MCU processor 10 may light the operation indicator lamp 11, the alarm indicator lamp 12, or the communication status indicator lamp 13 according to the operating conditions.

The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.

Claims (1)

1. A drawer cabinet joint temperature acquisition device is characterized by comprising an alternating current power supply input terminal (1), a self-recovery fuse (2), a piezoresistor (3), a filter circuit (4), a wide voltage input range power supply module (5), a TVS protection tube (6), a filter capacitor (7), a 433Mhz wireless transmitting circuit (8), a 433Mhz antenna (9), an MCU processor (10), a work indicator lamp (11), an alarm indicator lamp (12), a communication state indicator lamp (13), a sensor acquisition circuit (14) and an NTC sensor access terminal (15), wherein the alternating current power supply input terminal (1) is accessed to an L/N end of alternating current mains supply AC220V +/-20%, the wide voltage input range power supply module (5) is accessed through the self-recovery fuse (2), and the wide voltage input range power supply module (5) is selected from LS05-15B05 model 05SS, the self-recovery fuse (2) is selected to be 1A in specification, the two L/N ends of alternating current commercial power AC220V +/-20% are connected with a piezoresistor 10D471K in parallel to realize the input primary overvoltage protection function, and coupling capacitors are arranged between the L/N ends of alternating current commercial power AC220V +/-20% and between the L end and the N end and the ground; the wide voltage input range power module (5) selects AC 86-265V, outputs 5V +/-0.02 and consumes 5W, supplies power to the MCU processor (10), the 433Mhz wireless transmitting circuit (8) and the sensor acquisition circuit (14), the TVS protection tube (6) is arranged at the output stage of the power module (5), the model SMAF06J05V bidirectional protection tube is arranged, the sensor acquisition circuit (14) mainly comprises an operational amplifier and a sampling divider resistor, the operational amplifier is used for NTC temperature sensor signal following, the sampling divider resistor is used for matching a high-precision sampling reference voltage value, the NTC temperature sensor is accessed into the sensor acquisition circuit (14) through an NTC sensor access terminal (15), then sends the processed signal to the MCU processor (10), an STM32G07 model processor is selected, and the processor is mainly responsible for calculating the NTC temperature signal, the method comprises the following steps of out-of-limit temperature judgment, real-time temperature wireless delivery and running state judgment; the MCU processor (10) is connected with 433Mhz wireless transmitting circuit (8) and wirelessly transmits data to the display terminal through the antenna (9) by a frequency modulation mechanism; the MCU processor (10) lights the working indicator lamp (11), the alarm indicator lamp (12) or the communication state indicator lamp (13) according to the working condition.

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