A monitoring alarm for power plant relay protection

Abstract

The utility model discloses a monitoring alarm for power plant relay protection belongs to relay protection monitoring alarm field, including the box body (1) of bottom opening, be equipped with the back cover (2) at the opening of box body (1), be equipped with a plurality of fixed lug (3) on the outer edge of back cover (2), both sides of box body (1) are equipped with the vent (4), the dust screen (5) is covered on the vent (4), the inside of at least one vent (4) is equipped with the fan (6), and the fan (6) is connected power (8) through thermistor (7), and the temperature alarm (9) of connecting power (8) is equipped in box body (1). Temperature alarm (9) includes temperature control switch (10), bee calling organ (11) and pilot lamp (12), and bee calling organ (11) and pilot lamp (12) are connected power (8) through temperature control switch (10) after parallel connection. The utility model has the advantages of dust screen not easy to block, good heat dissipation effect and convenient maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of relay protection monitoring and alarm devices. Background Technology

[0002] The function of relay protection devices is to promptly issue warning signals to the operating personnel or directly issue trip commands to the controlled circuit breakers when a fault occurs in the power components (such as generators, lines, etc.) or the power system itself in a way that endangers the safe operation of the power system.

[0003] Relay protection devices generate heat during operation, and their performance becomes unstable once the temperature rises to a certain level. Therefore, they are generally used in monitoring and alarm systems. Existing monitoring and alarm systems typically include an openable housing, with the relay protection device fixed inside. One side of the housing has an air inlet with a dust filter, and the other side has an exhaust vent with a fan. A temperature alarm is also mounted on the housing; when the internal temperature rises to a certain level, the alarm sounds. Besides cooling the relay protection device and providing over-temperature alarms, the monitoring and alarm system also uses the housing to protect the device from impacts and provide insulation.

[0004] During the production process, it was found that the existing fan is directly connected to the power supply and is always running at high airflow. The large airflow through the casing causes lint and dust to accumulate quickly on the dust filter, making it easy for the dust filter to become clogged. Once the dust filter is clogged, the airflow through the casing decreases, which is not conducive to the heat dissipation of the relay protection device. Utility Model Content

[0005] The purpose of this invention is to provide a monitoring and alarm device for power plant relay protection. This invention has the advantages of a dustproof mesh that is not easily clogged, good heat dissipation, and convenient maintenance.

[0006] The technical solution of this utility model is as follows: A monitoring alarm device for power plant relay protection includes a box with an opening at the bottom, a back cover at the opening of the box, multiple fixing ears on the outer edge of the back cover, ventilation openings on both sides of the box, dustproof nets covering the ventilation openings, a fan inside at least one ventilation opening, the fan being connected to a power supply through a thermistor, and a temperature alarm connected to the power supply inside the box.

[0007] In the aforementioned monitoring alarm device for power plant relay protection, the temperature alarm device includes a temperature control switch, a buzzer, and an indicator light. The buzzer and indicator light are connected in parallel and then connected to the power supply through the temperature control switch.

[0008] In the aforementioned monitoring and alarm device for power plant relay protection, fans are provided on the inner side of the ventilation openings on both sides of the box, and the two fans are arranged in a staggered manner.

[0009] In the aforementioned monitoring and alarm device for power plant relay protection, a display screen is provided on the top surface of the housing, and a temperature sensor is provided inside the housing. The temperature sensor is connected to the display screen via a microcontroller.

[0010] In the aforementioned monitoring and alarm device for power plant relay protection, a button for connecting to a microcontroller is provided on the top surface of the housing.

[0011] In the aforementioned monitoring alarm device for power plant relay protection, a support assembly is provided between the housing and the back cover. The support assembly includes four positioning blocks, each fixed to the back cover. The four positioning blocks are located at the four corners of the back cover. The positioning blocks are provided with arc grooves facing the edges of the housing. A connecting plate is provided at the arc groove, and the connecting plate is connected to the housing by a spring.

[0012] In the aforementioned monitoring alarm device for power plant relay protection, the rear cover is connected to the housing by multiple second screws.

[0013] In the aforementioned monitoring alarm device for power plant relay protection, the dustproof net is connected to the housing by multiple first screws.

[0014] Compared with the prior art, the present invention mainly makes the following improvements based on existing monitoring and alarm devices: First, the fan is connected to the power supply through a thermistor. By utilizing the characteristic that the resistance of the thermistor changes with the ambient temperature, the fan can carry a large current when the temperature is high, forming a large airflow and dissipating heat faster. When the temperature is low, the fan can carry a small current, reducing the airflow and delaying the clogging of the dust filter.

[0015] Secondly, the device has two fans, providing a larger maximum airflow to meet the heat dissipation needs in hotter environments. By staggering the arrangement of the fans, airflow can pass through the casing more comprehensively, further improving the heat dissipation effect on the relay protection device. Third, a support assembly is provided between the box and the back cover. A friction connection is established through the spring on the support assembly. When frequently inspecting the relay protection device, the box can be easily removed for convenient maintenance.

[0016] In summary, this utility model has the advantages of easy dustproof mesh clogging, good heat dissipation effect, and convenient maintenance. Attached Figure Description

[0017] Figure 1 This is a front view schematic diagram of Example 1.

[0018] Figure 2 yes Figure 1 Enlarged view at point A.

[0019] Figure 3 yes Figure 1 A left-side view diagram.

[0020] Figure 4 This is a structural diagram of a temperature alarm.

[0021] Figure 5 This is a front view schematic diagram of Example 2.

[0022] Figure 6 This is a connection diagram of the microcontroller.

[0023] The labels in the attached diagram are as follows: 1-box body, 2-back cover, 3-fixing ear, 4-vent, 5-dustproof mesh, 6-fan, 7-thermometer, 8-power supply, 9-temperature alarm, 10-temperature control switch, 11-buzzer, 12-indicator light, 13-display screen, 14-temperature sensor, 15-microcontroller, 16-button, 17-support assembly, 18-positioning block, 19-arc groove, 20-connecting plate, 21-spring, 22-first screw, 23-second screw. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0025] Example 1: A monitoring and alarm device for power plant relay protection, such as... Figure 1 As shown, the box includes a box body 1 with an opening at the bottom. A back cover 2 is provided at the opening of the box body 1. The back cover 2 is connected to the box body 1 by multiple second screws 23. Four fixing ears 3 are provided on the outer edge of the back cover 2, and the four fixing ears 3 are respectively located near the four corners of the back cover 2. Both the box body 1 and the back cover 2 are plastic parts.

[0026] like Figure 3 As shown, ventilation openings 4 are provided on both sides of the box 1. Dustproof nets 5 are covered on the ventilation openings 4. The dustproof nets 5 are connected to the box 1 by multiple first screws 22. Fans 6 are provided on the inner side of the two ventilation openings. The two fans 6 are staggered. The fans 6 are connected to the power supply 8 through thermistors 7. The power supply 8 is fixed to the box 1. A temperature alarm 9 connected to the power supply 8 is provided inside the box 1.

[0027] like Figure 4 As shown, the temperature alarm 9 includes a temperature control switch 10, a buzzer 11, and an indicator light 12. The buzzer 11 and indicator light 12 are connected in parallel and then connected to a power supply 8 through the temperature control switch 10. The indicator light 12 is fixed to the top plate of the housing 1. The housing 1 has a light-emitting hole corresponding to the position of the indicator light 12. The indicator light 12 uses a light-emitting diode, and multiple lights can be set to improve visibility. The temperature control switch 10 is a KSD9700 model, which conducts at 55°C.

[0028] like Figure 2As shown, a support assembly 17 is provided between the box body 1 and the back cover 2. The support assembly 17 includes four positioning blocks 18, each fixed to the back cover 2. The four positioning blocks 18 are located at the four corners of the back cover 2. The positioning blocks 18 are provided with arc grooves 19 facing the edges of the box body 1. An arc-shaped connecting plate 20 is provided at the arc groove 19. The connecting plate 20 is connected to the box body 1 by a spring 21.

[0029] Working principle of Example 1: The relay protection device is fixed to the back cover 2 and located in the box 1. The back cover 2 is connected to the corresponding installation position on site by bolts passing through the fixing ears.

[0030] The resistance of thermistor 7 changes with temperature. When the temperature inside the housing 1 rises, the resistance decreases, the current through fan 6 increases, and the airflow of fan 6 increases, meeting the heat dissipation requirements. Conversely, when the temperature drops, the resistance of thermistor 7 increases, the airflow of fan 6 decreases, and the dust filter 5 is slowed down from clogging. Thermistor 7 can be model NTC 33D-11.

[0031] Both fans 6 exhaust air inwards. Because the two fans are staggered, the two airflows are in opposite directions and form a local collision, making the airflow inside the box 1 more turbulent and covering a larger area, thus improving the heat dissipation effect on the relay protection device.

[0032] When the fan 6 malfunctions, causing heat to accumulate inside the box 1 and the temperature to exceed the standard, or when the ambient temperature rises abnormally, causing the temperature inside the box 1 to exceed the standard, the temperature control switch 10 will be turned on, and the buzzer 11 and indicator light 12 will be powered on to provide timely assistance to the staff.

[0033] Some relay protection devices protect critical equipment, such as generators. To ensure safe production, these devices require frequent maintenance. For monitoring and alarm devices with built-in relay protection, the first screw 22 should be removed before fixing the rear cover 2. The connection between the rear cover 2 and the housing 1 relies on the friction between the connecting plate 20 and the positioning block 18 provided by the spring 21. When maintaining the relay protection device, the housing 1 can be directly removed, exposing the relay protection device for easy maintenance.

[0034] Example 2: A monitoring and alarm device for power plant relay protection, modified from Example 1, such as... Figure 5 As shown, the device includes a box body 1 with an opening at the bottom. A rear cover 2 is located at the opening of the box body 1. The rear cover 2 is connected to the box body 1 by multiple second screws 23. Four fixing ears 3 are located on the outer edge of the rear cover 2, near the four corners of the rear cover 2. Both the box body 1 and the rear cover 2 are made of plastic. A display screen 13 and multiple buttons 16 are located on the top surface of the box body 1. Some of the buttons 16 are reserved for future functional expansion. A temperature sensor 14 is located inside the box body 1.

[0035] like Figure 6 As shown, temperature sensor 14 is connected to display screen 13 via microcontroller 15, and multiple buttons 16 are also connected to microcontroller 15. Temperature sensor 14 can be a PT100 type. Microcontroller 15 can be an Arduino Uno (ATmega328P core). Microcontroller 15 drives temperature sensor 14 through the OneWire library, reading the temperature every 5-10 seconds. The real-time temperature is displayed on display screen 13. Using the RTClib library in conjunction with the DS3231 module, a timestamp of year, month, day, hour, minute, and second is generated and recorded to form historical temperatures. Historical temperatures can be retrieved via buttons 16 for later reference.

[0036] Both sides of the box 1 are provided with ventilation openings 4, and the ventilation openings 4 are covered with dustproof nets 5. The dustproof nets 5 are connected to the box 1 by multiple first screws 22. The inside of the two ventilation openings is provided with fans 6, and the two fans 6 are staggered. The fans 6 are connected to the power supply 8 through thermistors 7. The power supply 8 is fixed to the box 1. The box 1 is provided with a temperature alarm 9 connected to the power supply 8.

[0037] The temperature alarm 9 includes a temperature control switch 10, a buzzer 11, and an indicator light 12. The buzzer 11 and indicator light 12 are connected in parallel and then connected to a power supply 8 via the temperature control switch 10. The indicator light 12 is fixed to the top plate of the housing 1. The housing 1 has a light-emitting hole corresponding to the position of the indicator light 12. The indicator light 12 uses a light-emitting diode, and multiple lights can be set to improve visibility. The temperature control switch 10 is a KSD9700 model, which conducts at 55°C.

[0038] A support assembly 17 is provided between the box body 1 and the back cover 2. The support assembly 17 includes four positioning blocks 18, each fixed to the back cover 2. The four positioning blocks 18 are located at the four corners of the back cover 2. The positioning blocks 18 are provided with arc grooves 19 facing the edges of the box body 1. An arc-shaped connecting plate 20 is provided at the arc groove 19. The connecting plate 20 is connected to the box body 1 by a spring 21.

[0039] Example 3: A monitoring alarm for power plant relay protection, modified from Example 1, includes a box 1 with an opening at the bottom, a back cover 2 at the opening of the box 1, the back cover 2 and the box 1 being snapped together, and two fixing ears 3 on the outer edge of the back cover 2, the two fixing ears 3 being located in the middle of the two sides of the back cover 2 respectively.

[0040] Both sides of the box 1 are provided with ventilation openings 4, and the ventilation openings 4 are covered with dustproof nets 5. The dustproof nets 5 are riveted to the box 1. The inside of the two ventilation openings is provided with fans 6. The two fans 6 are staggered. The fans 6 are connected to the power supply 8 through thermistors 7. The power supply 8 is fixed to the box 1. The box 1 is provided with a temperature alarm 9 connected to the power supply 8.

[0041] The temperature alarm 9 includes a temperature control switch 10, a buzzer 11, and an indicator light 12. The buzzer 11 and the indicator light 12 are connected in parallel and then connected to a power supply 8 through the temperature control switch 10. The indicator light 12 is fixed to the top plate of the housing 1. The housing 1 has a light-emitting hole corresponding to the position of the indicator light 12. The indicator light 12 is a red LED.

[0042] A support assembly 17 is provided between the box body 1 and the back cover 2. The support assembly 17 includes four positioning blocks 18, each fixed to the back cover 2. The four positioning blocks 18 are located at the four corners of the back cover 2. The positioning blocks 18 are provided with arc grooves 19 facing the edges of the box body 1. An arc-shaped connecting plate 20 is provided at the arc groove 19. The connecting plate 20 is connected to the box body 1 by a spring 21.

[0043] Example 4: A monitoring alarm for power plant relay protection, modified from Example 1, includes a box 1 with an opening at the bottom, a rear cover 2 at the opening of the box 1, and the rear cover 2 is ultrasonically welded to the box 1. Four fixing ears 3 are provided on the outer edge of the rear cover 2, respectively located near the four corners of the rear cover 2. Both the box 1 and the rear cover 2 are made of plastic.

[0044] Both sides of the box 1 are provided with ventilation openings 4, and the ventilation openings 4 are covered with dustproof nets 5. The dustproof nets 5 are glued to the box 1. A fan 6 is provided inside one of the ventilation openings. The fan 6 is connected to a power supply 8 through a thermistor 7. The power supply 8 is fixed to the box 1. A temperature alarm 9 connected to the power supply 8 is provided inside the box 1.

[0045] The temperature alarm 9 includes a temperature control switch 10, a buzzer 11, and an indicator light 12. The buzzer 11 and the indicator light 12 are connected in parallel and then connected to the power supply 8 through the temperature control switch 10. The indicator light 12 is fixed to the top plate of the box 1. The box 1 is provided with a light-emitting hole corresponding to the position of the indicator light 12.

[0046] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A monitoring and alarm device for power plant relay protection, characterized in that: The box (1) includes a box body with an opening at the bottom. A back cover (2) is provided at the opening of the box body (1). Multiple fixing ears (3) are provided on the outer edge of the back cover (2). Ventilation openings (4) are provided on both sides of the box body (1). A dustproof net (5) is provided on the ventilation openings (4). A fan (6) is provided inside at least one ventilation opening (4). The fan (6) is connected to a power supply (8) through a thermistor (7). A temperature alarm (9) connected to the power supply (8) is provided inside the box body (1). A support assembly (17) is provided between the box body (1) and the back cover (2). The support assembly (17) includes four positioning blocks (18) that are fixed to the back cover (2). The four positioning blocks (18) are located at the four corners of the back cover (2). The positioning blocks (18) are provided with arc grooves (19) facing the edge of the box body (1). A connecting plate (20) is provided at the arc groove (19). The connecting plate (20) is connected to the box body (1) by a spring (21).

2. A monitoring and alarm device for power plant relay protection according to claim 1, characterized in that: The temperature alarm (9) includes a temperature control switch (10), a buzzer (11) and an indicator light (12). The buzzer (11) and the indicator light (12) are connected in parallel and then connected to the power supply (8) through the temperature control switch (10).

3. A monitoring and alarm device for power plant relay protection according to claim 1, characterized in that: Fans (6) are provided on the inner side of the ventilation openings (4) on both sides of the box (1), and the two fans (6) are staggered.

4. A monitoring and alarm device for power plant relay protection according to claim 1, characterized in that: The top surface of the box (1) is provided with a display screen (13), and a temperature sensor (14) is provided inside the box (1). The temperature sensor (14) is connected to the display screen (13) through a microcontroller (15).

5. A monitoring and alarm device for power plant relay protection according to claim 1, characterized in that: The top surface of the box (1) is provided with a button (16) for connecting to the microcontroller (15).

6. A monitoring and alarm device for power plant relay protection according to claim 1, characterized in that: The rear cover (2) is connected to the box body (1) by a plurality of second screws (23).

7. A monitoring and alarm device for power plant relay protection according to claim 1, characterized in that: The dustproof net (5) is connected to the box body (1) by a plurality of first screws (22).

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