CN219266441U

CN219266441U - Intelligent simulation device for thermal faults of switch cabinet

Info

Publication number: CN219266441U
Application number: CN202320187020.9U
Authority: CN
Inventors: 周亭杉; 杨超; 邓琴; 谢俊; 唐阳; 王净彤; 杜何森; 邓越飞
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2023-02-12
Filing date: 2023-02-12
Publication date: 2023-06-27
Anticipated expiration: 2033-02-12

Abstract

The utility model discloses an intelligent simulation device for thermal faults of a switch cabinet, which comprises a temperature control module, a temperature monitoring module, a man-machine interaction module and an alarm module. Six contacts in the temperature control module are connected with a temperature sensor and a cement resistor, and are all provided with a cooling fan. The temperature monitoring module uses a microcontroller main control chip to perform data acquisition processing, and calculates and controls the power of the heating element by combining the real-time temperature and the expected temperature so as to realize automatic control of the temperature of the contact. The man-machine interaction module detects real-time temperature and sets expected temperature through the touch panel. The alarm module alarms when the temperature control module is abnormal or the experiment fails, so that the experiment personnel can be reminded and warned. The utility model can simulate the heating phenomenon of a specific contact, can automatically set the reached abnormal temperature, realizes the monitoring and adjustment of the abnormal temperature through the closed-loop control of the temperature, has the active cooling function, and is more intelligent, safer and controllable in experiment.

Description

Intelligent simulation device for thermal faults of switch cabinet

Technical Field

The utility model relates to the technical field of power equipment, in particular to an intelligent simulation device for thermal faults of a switch cabinet.

Background

A switchgear is one of the key devices of an electrical power system. The switchgear cabinet is typically connected to the busbar by 6 contacts using a frame circuit breaker. In the long-term operation process of the equipment, parts such as the connection parts of the contacts and the bus bars in the switch cabinet generate heat due to aging or overlarge contact resistance, or the bus and the contacts often generate overhigh temperature rise when current carrying is overlarge, so that the performance of adjacent insulating parts is deteriorated, and the temperature of the heating parts cannot be monitored, so that breakdown and even fire are finally caused to cause accidents. Solving the problem of local overheat of the switch cabinet is a key to avoiding the occurrence of the accidents. Therefore, effective measures must be taken to monitor the temperature of the bus bars and contacts within the switchgear. The device capable of simulating the thermal faults of the switch cabinet is very important to research on the monitoring method of the thermal faults of the switch cabinet.

The electric power science institute of Guangxi electric network limited responsibility company applies for a novel heating fault simulation device of a switch cabinet by 24 days of 3 months in 2020. The utility model discloses a high-voltage switch cabinet heating fault simulation device, which simulates the temperature rise condition of a high-voltage switch cabinet when the high-voltage switch cabinet generates a heating fault, wherein an electric furnace heating wire is respectively arranged in a cable chamber, a bus chamber and a circuit breaker chamber of the high-voltage switch cabinet, so that various heating faults of the high-voltage switch cabinet can be comprehensively simulated. However, the device has the defects that the closed-loop control cannot be carried out on the temperature, the heating phenomenon of a specific contact cannot be simulated, and the active cooling cannot be carried out.

Disclosure of Invention

Aiming at the defects of the prior device, the utility model aims to simulate the thermal fault caused by the increase of the contact resistance between the busbar of the switch cabinet and the contact of the frame breaker, simulate the heating phenomenon of a specific contact, automatically set the reached abnormal temperature, realize the monitoring and the adjustment of the abnormal temperature through the closed-loop control of the temperature, and have the active cooling function.

In order to achieve the purpose, the switch cabinet thermal fault simulation device comprises a temperature control module, a temperature monitoring module, a man-machine interaction module and an alarm module. And a microcontroller main control chip in the temperature monitoring module controls the temperature control module, the man-machine interaction module and the alarm module. The ADC analog peripheral of the microcontroller transmits data through the temperature transmitter and the temperature sensor of the temperature control module, the serial port of the ADC analog peripheral transmits data with the touch panel of the man-machine interaction module, the general output interface of the ADC analog peripheral controls the buzzer switch of the alarm module, and the timer drives the MOS tube power switch in the temperature monitoring module. The microcontroller is connected with the MOS tube power switch, the temperature transmitter, the touch panel, the buzzer and the power supply through wires.

Preferably, the temperature control module comprises a binding post, a busbar structure, a temperature sensor probe, a heating element and a heat dissipation element. The binding post and busbar structure is formed by fixing 6 binding posts on a glass fiber board, and comprises a contact, the glass fiber board and a heat tracing belt, wherein the contact is arranged on the surface of the binding post, and the heat tracing belt is connected with the contact in a wired mode. The heating element is a cement resistor, and the heat dissipation element is a heat dissipation fan.

Preferably, the temperature monitoring module comprises a microcontroller and a temperature transmitter, wherein the microcontroller is connected with the temperature transmitter in a wired mode, and the temperature transmitter is connected with a temperature sensor in the temperature control module in a wired mode. The temperature monitoring module takes the real-time temperature acquired by the microcontroller as a feedback value, and combines the expected temperature value of the corresponding contact, and the microcontroller is used for calculating and controlling the on-off of the MOS tube power switch to control the power of the heating element and the heat dissipation element, so as to control the temperature of the contact.

Preferably, 6 temperature sensor probes in the temperature control module are respectively connected with 6 contacts to convert temperature signals into resistance signals. The temperature sensor is connected with the temperature transmitter in a wired mode to transmit real-time temperature to the microcontroller. The cement resistors are respectively connected with the 6 contacts, the 6 cooling fans are fixed on the glass fiber plates, the blade surfaces of the cooling fans are respectively opposite to the 6 contacts, the cement resistors and the cooling fans can change the temperature of the contacts, and the heating phenomenon of a specific contact can be simulated.

Preferably, the man-machine interaction module comprises a touch panel. The touch panel receives the real-time temperature of 6 contacts from the microcontroller. The touch panel is also provided with a temperature adjusting button, a time setting button and a timing button, and the expected temperature value and the set time range of the corresponding contact can be adjusted by touching the button, so that counting and switch control are realized.

Preferably, the alarm module is provided with a buzzer, and the buzzer is connected with the microcontroller in a wired mode. The microcontroller controls the buzzer switch according to the simulated cooling condition of the touch panel within the time range, namely if the contact cannot cool to the normal temperature within the time range, the buzzer is turned on. The buzzer is provided with a manual switch.

Preferably, the frame made of the aluminum profile simulates the distribution positions of the wiring terminals and the busbar structure of the switch cabinet. The long side of the frame made of the aluminum profile is 100cm, the short side of the frame is 60cm, and the height of the frame is 170cm. The wiring post and the busbar structure are 117cm away from the bottom of the frame, and the wiring post is 63cm away from the glass fiber plate, so that the distribution positions of the wiring post and the busbar structure of the switch cabinet are simulated.

Preferably, the wiring post of wiring post and female row structure is apart from glass fiber board 63cm, processes 3 screw holes on the wiring post, and two are used for fixing on glass fiber board, and one is used for fixing the aluminum pipe that is used for simulating female row. The binding posts are aluminum posts, the thickness is 15mm, the width is 60mm, the length is 60mm, the horizontal spacing is 35mm, the vertical spacing is 40mm, and the binding posts are fixed on the glass fiber plates by two screws. The glass fiber board is a glass fiber board with the length of 30cm multiplied by 30cm and the thickness of 5mm, and is embedded into a frame made of aluminum profiles.

Preferably, the 6 contacts of the frame circuit breaker are respectively connected with 6 heat tracing bands, and the heat tracing bands are fixed on aluminum tubes of the simulation busbar in an adhesion mode. The heat tracing belt is a flame-retardant heat tracing belt, and the heat tracing belt is connected with commercial power. The commercial power is AC220V.

Advantageous effects

The utility model provides an intelligent simulation device for thermal faults of a switch cabinet. Compared with the prior art, the method has the following beneficial effects:

(1) The intelligent simulation device for the thermal faults of the switch cabinet is controlled by connecting the temperature monitoring module with the temperature control module, the man-machine interaction module and the alarm module, so that the experiment is controlled in a closed loop, and the intelligent simulation device is more intelligent, safer and more controllable. The temperature sensor probe and the cement resistor are connected to each contact correspondingly, and the cooling fan is arranged, so that the heating phenomenon of a specific contact can be simulated, the closed-loop control and the active cooling function of the contact temperature are realized, and the simulated heating fault is comprehensive.

(2) The intelligent simulation device for the thermal faults of the switch cabinet is connected with the microcontroller through the touch panel in the man-machine interaction module, the temperature of each contact can be monitored in real time, an experimenter can set the reached abnormal temperature on the touch panel by himself, meanwhile, the experimenter can analyze data and adjust the expected temperature in a targeted manner, expected experimental conditions are achieved, monitoring and adjustment of the abnormal temperature are achieved, and experimental efficiency and accuracy of experimental results are improved.

(3) This cubical switchboard thermal failure intelligent simulation device reminds experimenter device unusual and experimental result through alarm module, makes things convenient for experimenter to adjust, makes experimental effect more directly perceived.

(4) The intelligent simulation device for the heat faults of the switch cabinet directly uses the power frequency AC220V to supply power to the heat tracing belt, is used for simulating the heat effect of the busbar in current carrying, and enables experiments to be accurate and loss to be controllable.

Drawings

FIG. 1 is a frame distribution diagram of the present utility model

In fig. 1, 1 is a temperature control module, 2 is a temperature monitoring module, 3 is a human-computer interaction module, and 4 is an alarm module.

FIG. 2 is a schematic diagram of a temperature control module connection according to the present utility model

In fig. 2: 5-temperature sensor probe, 6-contact, 7-cement resistor, 8-radiator fan, 9-glass fiber board and 10-heat tracing band.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, the present utility model provides a technical solution: an intelligent simulation device for the thermal faults of a switch cabinet is characterized in that an integral frame is made of aluminum profiles, a temperature control module is shown in 1, a temperature monitoring module is shown in 2, a human-computer interaction module is shown in 3, and an alarm module is shown in 4.

As shown in fig. 2, the temperature control module has 6 terminals connected to the aluminum tubes of the analog busbar. The aluminum pipe is fixed on the binding post by a screw. The binding post is fixed on the glass fiber board 9 by a screw. The glass fiber board 9 is embedded in a frame made of aluminum profile. The frame breaker 6 contacts 6 are connected with the heat tracing belt 10 to simulate the thermal effect of the busbar in current carrying. The contact 6 is connected to the temperature sensor probe 5. The cement resistor 7 serves as a heating element to heat the contact 6, and the cooling fan 8 serves as a cooling element to cool the contact 6.

The intelligent temperature control system comprises a temperature control module 1, a temperature monitoring module 2, a man-machine interaction module 3 and an alarm module 4, wherein the temperature control module 1, the man-machine interaction module 3 and the alarm module 4 are connected with the temperature monitoring module 2 in a wired mode, and the temperature monitoring module 2 uses a microcontroller to perform data acquisition processing and realize automatic control. And the microcontroller selects an STM32 singlechip core board. The contact 6 is conducted to the thermal resistance temperature sensor probe 5, the thermal resistance converts a temperature signal into a resistance signal, the resistance signal is converted into an electric signal through a temperature transmitter, the electric signal is collected through the GPIO of the microcontroller, and the 10-bit high-speed ADC integrated by the chip performs analog-to-digital conversion to complete the process of temperature collection.

The working principle of the utility model is that the cement resistors 7 of 6 heating elements in the figure 2 generate heat to respectively heat 6 contacts 6, the thermal fault caused by the increase of the contact resistance between the busbar of the switch cabinet and the contacts of the frame breaker is simulated, the working state of the cement resistor 7 is controlled by controlling the on-off state of the MOS tube power switch, the magnitude of heat productivity is changed, the temperature of the contacts 6 is changed, and the effect of simulating the thermal fault caused by the increase of the contact resistance of different contacts is achieved. After the temperature signal of the contact 6 is processed by the temperature sensor, the temperature transmitter and the microcontroller, the microcontroller displays real-time temperature feedback on the touch panel through the serial port, so that real-time monitoring of the contact is realized. The microcontroller chip calculates PWM waveform output by using a sectional control idea and a PID algorithm according to the expected temperatures of different contacts preset on the touch panel and the real-time temperature fed back, controls the on-off of a MOS tube power switch, and controls the power of the cement resistor 7 and the cooling fan 8, so that the heat of the contact 6 is changed, the contact 6 reaches the expected temperature, and the temperature closed-loop control is realized.

The touch panel in the man-machine interaction module 3 obtains the acquired temperature data from the microcontroller through the serial port, the touch panel displays the real-time temperature data on a homepage, and an operator can change preset temperature, set time and start to pause experiments through the man-machine interaction page. The touch panel sends the preset temperature to the microcontroller through the serial port, and the temperature is used as the expected temperature to control. The microcontroller takes the real-time temperature acquired in real time as a feedback value, combines the expected temperature received by the serial port, calculates the real-time temperature by a PID algorithm, and the calculated result is a PWM duty ratio, and PWM controls the on-off of a MOS tube power switch so as to control the working states of the cement resistor 7 and the cooling fan 8, thereby achieving the purpose of controlling power, finally realizing the closed-loop control of the temperature and realizing the functions of temperature control and man-machine interaction.

The power supply consists of a switching power supply with DC24V/DC12V output in a double-way and a voltage stabilizing module with DC12V to DC5V, and is used for supplying power to a main control chip, a temperature transmitter, a cooling fan 8, a cement resistor 7, a touch panel and a buzzer. The heat tracing belt directly uses the power supply of the power frequency AC220V and is used for simulating the thermal effect of the busbar in the current carrying process. The main power supply selects a switching power supply with two-way output of 24V/12V, the cement resistor and the temperature transmitter are powered by 24V direct current, the radiator fan is powered by 12V direct current, and the singlechip, the touch display screen and the buzzer are powered by 5V direct current from a 12V direct current power supply to a 5V direct current from a DC12V to DC5V voltage stabilizing module.

The temperature monitoring module 2 mainly realizes real-time measurement, display and control of the temperature of the contact, setting of the expected temperature of the contact 6 and display of the running state. The temperature of each contact can be known by staff through the data displayed on the touch panel, the temperature to be reached when the temperature of each contact is abnormally increased can be set, the heating or cooling process can be started and suspended through the touch panel, the working state is fed back to the staff through the indicator lamp, the staff is in an operating state and lights the red lamp, and the staff is in a white lamp in a suspended state. The singlechip master control chip calculates PWM waveforms by using a PID algorithm according to the expected temperature and the feedback temperature, outputs the PWM waveforms to drive the MOS tube power switch through the singlechip digital peripheral timer, controls the on-off of the power switch, and changes the working state of the heating element. When the temperature difference between the expected temperature and the actual temperature is large, PWM waves with high duty ratio are output, full-speed heating is performed, and the rapidity of temperature rise is improved; when the actual temperature approaches the expected temperature, the PWM duty ratio is reduced, the temperature rise is restrained, and the overshoot is reduced; when the actual temperature is equal to the expected temperature, the PWM duty ratio is maintained, so that certain rapidity is ensured, stability is also met, and overshoot caused by a thermal hysteresis effect is reduced. When the temperature of the contact is required to be reduced from high temperature to low temperature, the cement resistor 7 stops heating, the cooling fan 8 is required to participate in active cooling, the control idea adopts sectional control, the cooling fan 8 runs at full speed to dissipate heat when the temperature difference is large, the rotating speed of the cooling fan 8 is reduced or the working is stopped when the temperature difference is small, and the contact 6 is waited to naturally cool to the set temperature.

The alarm module 4 mainly realizes the functions of reminding and warning of abnormal conditions and experimental failure. When the temperature control module 2 does not work normally, namely the contact does not reach the range of the expected temperature within a certain time, the buzzer sounds for alarm. And after the experiment is started, the contact is not cooled to the normal temperature within the set time, and the buzzer sounds for a long time to give an alarm. Thereby warning and reminding experimenters of abnormal simulation devices or experimental failure. The buzzer long alarm can only be released by manual closing.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The intelligent simulation device for the heat faults of the switch cabinet comprises a temperature control module (1), a temperature monitoring module (2), a man-machine interaction module (3) and an alarm module (4), and is characterized in that the temperature monitoring module (2) is connected with the temperature control module (1) in a wired mode, the temperature monitoring module (2) is connected with the man-machine interaction module (3) in a wired mode, and the temperature monitoring module (2) is connected with the alarm module (4) in a wired mode;

the temperature control module (1) comprises a temperature sensor probe (5), 6 contacts (6), a cement resistor (7), a cooling fan (8), a glass fiber board (9) and a heat tracing belt (10), wherein the contacts (6) are fixed on the glass fiber board (9), the heat tracing belt (10) is connected with the contacts (6) in a wired mode, each contact (6) is connected with the temperature sensor probe (5) and the cement resistor (7), and the cooling fan (8) is arranged on the glass fiber board (9) corresponding to each contact.

2. The intelligent simulation device for the thermal faults of the switch cabinet according to claim 1 is characterized in that the temperature monitoring module (2) comprises a microcontroller and a temperature transmitter, the microcontroller is connected with the temperature transmitter in a wired mode, and the temperature transmitter is connected with a temperature sensor probe (5) in the temperature control module (1) in a wired mode.

3. The intelligent simulation device for the thermal faults of the switch cabinet according to claim 1 is characterized in that the man-machine interaction module (3) comprises a touch panel, and the touch panel is connected with a microcontroller in the temperature monitoring module (2) in a wired mode.

4. The intelligent simulation device for the thermal faults of the switch cabinet according to claim 1 is characterized in that the alarm module (4) comprises a buzzer, and the buzzer is connected with a microcontroller in the temperature monitoring module (2) in a wired mode.

5. The intelligent simulation device for the thermal faults of the switch cabinet according to claim 1 is characterized in that a heat tracing belt (10) is connected with a commercial power.