Fast electrical fire protection current limiting protection device

Abstract

The invention discloses a rapid electrical fire prevention current limiting protection device, which comprises a zero-crossing detection module, a change rate normalization module, a microprocessor, a current sensor, a main control switch and a load circuit. The device normalizes the load current so that the value of the real-time normalized current relative change rate drt based on which the microprocessor makes a short-circuit judgment is always kept between 0 and 1, and the threshold table is the same regardless of the value of the load rated current, that is, when the load rated current is 10A, 32A or 63A, etc., the value of its standard normalized current relative change rate drti is the same, and there is no need to replace different current limiting protection devices for different loads. The device can adapt to most rated current loads, especially load circuits below 64A.

Description

Technical Field

[0001] The invention relates to a rapid electrical fire protection and current limiting protection device. Background Art

[0002] In recent years, the number of electrical fire accidents in my country has been increasing year by year. According to statistics, electrical fires account for 30.2% of all types of fire accidents, of which major electrical fires account for 70% of the total number of major fires. In the past three years, electrical fires caused by electrical faults have occurred frequently, resulting in huge casualties and property losses. Due to the complexity of electrical equipment in buildings, fires caused by electrical short circuits and overloads are becoming more and more common, and related fire cases are also increasing.

[0003] In actual circuits, fires caused by local high temperatures due to short circuits, overloads, etc. are called overheating fires. Overheating fire prevention technology is based on the overcurrent protector cutting off the circuit when the current exceeds a given set value. However, since the action time of the overcurrent protector is between tens and hundreds of milliseconds, the current in the circuit has risen to hundreds of times the rated current before the circuit is cut off, which can easily cause high temperatures and fires.

[0004] Therefore, the key to effectively avoiding fires caused by short-circuit faults is how to achieve rapid current limiting. When a short-circuit fault occurs in the circuit, the detection system can detect and disconnect it in a very short time, so that the short-circuit current is only limited to several times the rated current and is disconnected by current limiting, effectively reducing the energy released by the short-circuit fault and greatly reducing the probability of electrical fires.

[0005] In order to achieve fast current limiting protection, the existing technology determines short circuit by setting relevant thresholds and uses fast electronic switches to disconnect the circuit, such as real-time current value, the rate of change of the difference between two adjacent load currents relative to time, etc. When the actual detected characteristic value exceeds the preset threshold, the protector will perform the disconnection process.

[0006] For example, the Chinese invention patent application number is 201910504259.2, and its name is a current-limiting electrical fire-proof short-circuit protection device and short-circuit protection method, which uses the method of comparing the change rate of the difference between two adjacent load current data relative to time with the reference change rate to determine whether there is a short circuit. This device has the following disadvantages:

[0007] 1. Different loads and currents require different reference change rates, i.e., thresholds, for different rated currents, which results in poor versatility.

[0008] 2. The change rate calculated by this method is large, and the noise will also be amplified;

[0009] 3. The setting of the reference change rate, i.e., the threshold, is affected by subjective factors. Usually, the reference change rate, i.e., the threshold, is artificially set to a constant value, which lacks reliability. If the threshold is set to a large value, the detection time will be extended; if the threshold is set to a small value, misjudgment will occur. Summary of the invention

[0010] The present invention provides a rapid electrical fire protection and current limiting protection device, which overcomes the shortcomings of the background technology. The technical solution adopted by the present invention to solve its technical problems is:

[0011] A fast electrical fire protection current limiting protection device, which includes a zero-crossing detection module, a rate of change normalization module, a microprocessor, a current sensor, a main control switch and a load circuit;

[0012] The zero-crossing detection module is used to detect the zero-crossing signal of the load current and convert the sinusoidal signal of the load current into a square wave signal. It is connected in parallel to the load circuit, and its output end is connected to the microprocessor;

[0013] The current sensor is used to collect the current of the load circuit and convert the load current signal into a voltage signal, the input end of which is connected in series in the load circuit, and the output end of which is connected to the input end of the change rate normalization module;

[0014] The main control switch is connected in series in the load circuit, which is connected to the microprocessor, and the main control switch is controlled to be turned on or off by the microprocessor;

[0015] The change rate normalization module is used to calculate the real-time normalized current relative change rate drt and transmit the real-time normalized current relative change rate drt to the microprocessor. It collects the load current value in real time according to the sampling time interval dt, subtracts the current value collected at the previous moment from the current value collected at the current moment, and takes the absolute value of the result, and then divides the data after taking the absolute value by the sum of the absolute value of the current value at the current moment and the absolute value of the current value at the previous moment, and finally obtains the real-time normalized current relative change rate drt. The output end of the change rate normalization module is connected to the microprocessor;

[0016] The microprocessor has a built-in threshold table, and the threshold in the threshold table is the standard normalized current relative change rate drti obtained by dividing the absolute value of the difference between the current value and the previous value of the standard sinusoidal signal by the sum of the absolute value of the current value and the absolute value of the previous value;

[0017] The microprocessor waits for the zero-crossing trigger signal, and is set to receive the real-time normalized current relative change rate drt once every dt seconds and compare it with the corresponding standard normalized current relative change rate drti in the threshold table. If the drt received is greater than drti for N consecutive times, the microprocessor determines that a short circuit has occurred in the load circuit, and controls the main control switch to disconnect to achieve short-circuit protection.

[0018] In a preferred embodiment: the change rate normalization module includes a proportional circuit, a delay circuit, a subtraction circuit, a first precision full-wave rectifier circuit, a division circuit, a square root circuit, a second precision full-wave rectifier circuit, a third precision full-wave rectifier circuit and an addition circuit. The input end of the proportional circuit is connected to the output end of the current sensor, and its output end is connected to the input end of the delay circuit and the input end of the subtraction circuit. The output end of the delay circuit is connected to the input end of the subtraction circuit, and the output end of the subtraction circuit is connected to the input end of the first precision full-wave rectifier circuit. The output end of the first precision full-wave rectifier circuit is connected to the input end of the division circuit, the input end of the second precision full-wave rectifier circuit is connected to the output end of the delay circuit, the input end of the third precision full-wave rectifier circuit is connected to the output end of the proportional circuit, the output end of the second precision full-wave rectifier circuit and the output end of the third precision full-wave rectifier circuit are both connected to the input end of the addition circuit, the output end of the addition circuit is connected to the input end of the division circuit, the output end of the division circuit is connected to the input end of the square root circuit, and the output end of the square root circuit is connected to the microprocessor.

[0019] In a preferred embodiment: the zero-crossing detection module includes a voltage compensation circuit and a zero-crossing detection circuit, the zero-crossing detection circuit uses a high-speed photocoupler for detection, and the output end of the high-speed photocoupler is connected to a microprocessor; the voltage compensation circuit is used to compensate for the forward voltage drop of the high-speed photocoupler, its input end is connected in parallel with the load circuit, and its output end is connected to the input end of the zero-crossing detection circuit.

[0020] In a preferred embodiment: it also includes a valid value acquisition module and a key input module:

[0021] The effective value acquisition module is used to process the load current to obtain the effective value of the load current, and its input end is connected to the output end of the current sensor, and its output end is connected to the microprocessor;

[0022] The key input module is used to set the reference overload threshold and control the reset of the main control switch, and is connected to the microprocessor;

[0023] The microprocessor refreshes the collected current effective value once every half-wave. At the same time, the microprocessor refreshes the overload threshold from the key input module once every half-wave, and compares the current effective value with the overload threshold. When the current effective value exceeds the overload threshold for n consecutive times, the microprocessor determines that the load circuit is overloaded and controls the main control switch to disconnect.

[0024] In a preferred embodiment: the effective value acquisition module includes a low-pass filter circuit, a fourth precision full-wave rectifier circuit and a capacitor filter circuit connected in series in sequence, the input end of the low-pass filter circuit is connected to the output end of the current sensor, and the output end of the capacitor filter circuit is connected to the microprocessor.

[0025] In a preferred embodiment, it also includes a display module, which is used to display the reference overload threshold and whether the line is short-circuited or overloaded, and its input end is connected to the microprocessor.

[0026] A preferred embodiment also includes an alarm module, which is used to send out sound and light alarm signals when a short circuit or overload occurs in the load circuit, and its input end is connected to the microprocessor.

[0027] A preferred embodiment also includes a communication module, which is used to complete human-computer interaction and send alarm information, and is connected to the microprocessor.

[0028] In a preferred embodiment: it also includes a driving module, the input end of the driving module is connected to the microprocessor, and the output end of the driving module is connected to the main control switch.

[0029] In a preferred embodiment, it also includes an auxiliary power supply module, which provides power with different voltages for the entire device, and its output end is connected to the microprocessor.

[0030] Compared with the background technology, this technical solution has the following advantages:

[0031] 1. The device normalizes the load current so that the value of the real-time normalized current relative change rate drt used by the microprocessor for short-circuit judgment is always maintained between 0 and 1, and the threshold table is the same regardless of the load rated current value, that is, when the load rated current is 10A or 32A or 63A, etc., the value of the standard normalized current relative change rate drti is the same, and there is no need to replace different current limiting protection devices for different loads. The device can adapt to most rated current loads, especially load circuits below 64A.

[0032] Moreover, the threshold value calculated by using the normalized current relative change rate is small, so that the noise will not be amplified and will not be easily disturbed by the noise.

[0033] At the same time, it is more reliable to use the standard normalized current relative change rate drti as the threshold. The threshold is not a constant value, but is calculated according to the current value of the standard sinusoidal signal. The drti value at each moment is different, which makes the real-time normalized current relative change rate drt closer to the corresponding standard normalized current relative change rate drti value. Not only is it less likely to make a misjudgment, but the reaction time of the microprocessor to detect and judge whether a short circuit has occurred in the load circuit is shorter, which can reach 120us, thereby improving the reliability and effectiveness of the detection results.

[0034] 2. The voltage compensation circuit is used to compensate for the forward voltage drop of the high-speed optocoupler, which can make the square wave signal and the load current signal strictly synchronized without delay, ensuring the strict correspondence between the real-time normalized current relative change rate drt and the standard normalized current relative change rate drti.

[0035] 3. The effective value acquisition module can collect the effective value of the load current. The microprocessor can compare the effective value of the current with the overload threshold to determine whether the load circuit is overloaded, and can further protect the load circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Figure 1 A principle block diagram of a fast electrical fire protection and current limiting protection device according to a preferred embodiment is shown.

[0038] Figure 2 The circuit block diagram of the rate-of-change normalization module is shown.

[0039] Figure 3 The specific circuit diagram of the change rate normalization module is shown.

[0040] Figure 4 The specific circuit diagram of the zero-crossing detection module is shown.

[0041] Figure 5 The circuit block diagram of the driving module is shown.

[0042] Figure 6 The specific circuit diagram of the effective value acquisition module is shown.

[0043] Figure 7 The waveform of the standard normalized current relative change rate drti is plotted. DETAILED DESCRIPTION

[0044] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0045] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0046] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, the terms "fixed connection" and "fixed connection" should be understood in a broad sense, that is, any connection method without any displacement relationship and relative rotation relationship between the two parties, that is to say, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0047] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0048] Please refer to Figures 1 to 7 A preferred embodiment of a rapid electrical fire-proof current-limiting protection device, the rapid electrical fire-proof current-limiting protection device, comprises a zero-crossing detection module 5, a rate-of-change normalization module 2, a microprocessor 10, a current sensor 1, a main control switch 6 and a load circuit.

[0049] The zero-crossing detection module 5 is used to detect the zero-crossing signal of the load current and convert the sinusoidal signal of the load current into a square wave signal. It is connected in parallel to the load circuit, and its output end is connected to the microprocessor 10 .

[0050] In this embodiment, the zero-crossing detection module 5 includes a voltage compensation circuit 51 and a zero-crossing detection circuit 52. The zero-crossing detection circuit 52 uses a high-speed photocoupler for detection, and the output end of the high-speed photocoupler is connected to the microprocessor 10; the voltage compensation circuit 51 is used to compensate for the forward voltage drop of the high-speed photocoupler, and its input end is connected in parallel with the load circuit, and its output end is connected to the input end of the zero-crossing detection circuit 52. Figure 4 As shown, the high-speed optocoupler uses a 6N137 chip.

[0051] The current sensor 1 is used to collect the current of the load circuit and convert the load current signal into a voltage signal. Its input end is connected in series in the load circuit, and its output end is connected to the input end of the change rate normalization module 2.

[0052] The main control switch 6 is connected in series in the load circuit, which is connected to the microprocessor 10 , and the main control switch 6 is controlled to be turned on or off by the microprocessor 10 .

[0053] The change rate normalization module 2 is used to calculate the real-time normalized current relative change rate drt and transmit the real-time normalized current relative change rate drt to the microprocessor 10, which collects the load current value in real time according to the sampling time interval dt, subtracts the current value collected at the previous moment from the current value collected at the current moment, and takes the absolute value of the result, and then divides the data after taking the absolute value by the sum of the absolute value of the current value at the current moment and the absolute value of the current value at the previous moment, and finally obtains the real-time normalized current relative change rate drt, and the output end of the change rate normalization module is connected to the microprocessor 10;

[0054] The microprocessor 10 has a built-in threshold table 3, in which the threshold value is the standard normalized current relative change rate drti obtained by dividing the absolute value of the difference between the current value and the previous value of the standard sinusoidal signal by the sum of the absolute value of the current value and the absolute value of the previous value. Figure 6 As shown, it is a waveform diagram formed between the standard normalized current relative change rate drti and the time axis, and the waveform diagram is the same regardless of the current value in the load circuit.

[0055] The microprocessor 10 waits for a zero-crossing trigger signal, and is set to receive a real-time normalized current relative change rate drt every dt seconds and compare it with the corresponding standard normalized current relative change rate drti in the threshold table. If the drt received is greater than drti for N consecutive times, the microprocessor 10 determines that a short circuit occurs in the load circuit, and controls the main control switch 6 to disconnect to achieve short-circuit protection.

[0056] Taking the current of the load circuit during normal operation as 10A as an example, if at a certain moment its standard normalized current relative change rate drti is 0.02, but at this time the load circuit is short-circuited and the current rises to 100A, the change rate normalization module 2 calculates the real-time normalized current relative change rate drt = |100-10| / (|100|+|10|) = 0.818, 0.818 is greater than 0.02, that is, at this moment: the real-time normalized current relative change rate drt is greater than the corresponding standard normalized current relative change rate drti. If the microprocessor 10 receives signals for N consecutive times that the real-time normalized current relative change rate drt is greater than the corresponding standard normalized current relative change rate drti, the microprocessor 10 determines that the load circuit is short-circuited and the main control switch 6 is disconnected.

[0057] In this embodiment, Figure 2As shown, the change rate normalization module 2 includes a proportional circuit 21, a delay circuit 22, a subtraction circuit 24, a first precision full-wave rectifier circuit 26, a division circuit and a square root circuit 28, a second precision full-wave rectifier circuit 23, a third precision full-wave rectifier circuit 25 and an addition circuit 27. The input end of the proportional circuit 21 is connected to the output end of the current sensor 1, and its output end is connected to the input end of the delay circuit 22 and the input end of the subtraction circuit 24. The output end of the delay circuit 22 is connected to the input end of the subtraction circuit 24, and the output end of the subtraction circuit 24 is connected to the output end of the first precision full-wave rectifier circuit 26. The input end is connected, the output end of the first precision full-wave rectifier circuit 26 is connected to the input end of the division circuit and the open circuit 28, the input end of the second precision full-wave rectifier circuit 23 is connected to the output end of the delay circuit 22, the input end of the third precision full-wave rectifier circuit 25 is connected to the output end of the proportional circuit 21, the output end of the second precision full-wave rectifier circuit 23 and the output end of the third precision full-wave rectifier circuit 25 are both connected to the input end of the addition circuit 27, the output end of the addition circuit 27 is connected to the input end of the division circuit and the square root circuit 28, and the output end of the division circuit and the square root circuit 28 is connected to the microprocessor 10.

[0058] Furthermore, the device further comprises a valid value acquisition module 4 and a key input module 8:

[0059] The effective value acquisition module 4 is used to process the load current to obtain the effective value of the load current, and its input end is connected to the output end of the current sensor 1, and its output end is connected to the microprocessor 10;

[0060] The key input module 8 is used to set the reference overload threshold and control the reset of the main control switch 6, and is connected to the microprocessor 10;

[0061] The microprocessor 10 refreshes the collected current effective value once every half-wave. At the same time, the microprocessor 10 refreshes the overload threshold from the key input module 8 once every half-wave, and compares the current effective value with the overload threshold. When the current effective value exceeds the overload threshold for n consecutive times, the microprocessor 10 determines that the load circuit is overloaded and controls the main control switch 6 to disconnect.

[0062] In this embodiment, the effective value acquisition module 4 includes a low-pass filter circuit, a fourth precision full-wave rectifier circuit and a capacitor filter circuit connected in series in sequence, the input end of the low-pass filter circuit is connected to the output end of the current sensor, and the output end of the capacitor filter circuit is connected to the microprocessor.

[0063] In this embodiment, the device further includes a display module 11 , which is used to display the reference overload threshold and whether the line is short-circuited or overloaded, and an input end of the display module 11 is connected to the microprocessor 10 .

[0064] In this embodiment, the device further includes an alarm module 12 , which is used to send out an audible and visual alarm signal when a short circuit or overload occurs in the load circuit, and an input end of the alarm module 12 is connected to the microprocessor 10 .

[0065] In this embodiment, the device further includes a communication module 13 , which is used to complete human-computer interaction and send alarm information, and is connected to the microprocessor 10 .

[0066] In this embodiment, the device further comprises a driving module, the input end of the driving module is connected to the microprocessor, and the output end of the driving module is connected to the main control switch. Figure 6 As shown, the driving module includes a 2SD315AI chip 71 and a reset circuit 73 , an RC network 72 , a first peripheral protection circuit 74 and a second peripheral protection circuit 75 , all of which are connected to the chip 71 .

[0067] In this embodiment, the device further includes an auxiliary power supply module 9 , which provides power with different voltages for the entire device, and an output end of which is connected to a microprocessor 10 .

[0068] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. Rapid electrical fire protection and current limiting protection device, characterized by: It includes a zero-crossing detection module, a change rate normalization module, a microprocessor, a current sensor, a main control switch and a load circuit; The zero-crossing detection module is used to detect the zero-crossing signal of the load current and convert the sinusoidal signal of the load current into a square wave signal. The zero-crossing detection module is connected in parallel to the load circuit. The output end of the zero-crossing detection module is connected to the microprocessor. The zero-crossing detection module outputs a zero-crossing trigger signal. The current sensor is used to collect the current of the load circuit and convert the load current signal into a voltage signal. The input end of the current sensor is connected in series in the load circuit, and the output end of the current sensor is connected to the input end of the change rate normalization module. The main control switch is connected in series in the load circuit, and the main control switch is connected to the microprocessor, and the microprocessor controls the main control switch to be turned on or off; The change rate normalization module is used to calculate the real-time normalized current relative change rate drt and transmit the real-time normalized current relative change rate drt to the microprocessor. The change rate normalization module collects the load current value in real time according to the sampling time interval dt, subtracts the current value collected at the previous moment from the current value collected at the current moment, and takes the absolute value of the result, and then divides the data after taking the absolute value by the sum of the absolute value of the current value at the current moment and the absolute value of the current value at the previous moment, and finally obtains the real-time normalized current relative change rate drt. The output end of the change rate normalization module is connected to the microprocessor; The microprocessor has a built-in threshold table, and the threshold in the threshold table is the standard normalized current relative change rate drti obtained by dividing the absolute value of the difference between the current moment value and the previous moment value of the standard sinusoidal signal by the sum of the absolute value of the current moment value and the absolute value of the previous moment value; The microprocessor waits for the zero-crossing trigger signal, and is set to receive the real-time normalized current relative change rate drt once every dt seconds and compare it with the corresponding standard normalized current relative change rate drti in the threshold table. If the drt received is greater than drti for N consecutive times, the microprocessor determines that a short circuit has occurred in the load circuit, and controls the main control switch to disconnect to achieve short-circuit protection.

2. The rapid electrical fire protection and current limiting protection device according to claim 1 is characterized in that: The change rate normalization module includes a proportional circuit, a delay circuit, a subtraction circuit, a first precision full-wave rectifier circuit, a division circuit, a square root circuit, a second precision full-wave rectifier circuit, a third precision full-wave rectifier circuit and an addition circuit. The input end of the proportional circuit is connected to the output end of the current sensor, the output end of the proportional circuit is connected to the input end of the delay circuit and the input end of the subtraction circuit, the output end of the delay circuit is connected to the input end of the subtraction circuit, the output end of the subtraction circuit is connected to the input end of the first precision full-wave rectifier circuit, the output end of the first precision full-wave rectifier circuit is connected to an input end of the division circuit, the input end of the second precision full-wave rectifier circuit is connected to the output end of the delay circuit, the input end of the third precision full-wave rectifier circuit is connected to the output end of the proportional circuit, the output end of the second precision full-wave rectifier circuit and the output end of the third precision full-wave rectifier circuit are respectively connected to two input ends of the addition circuit, the output end of the addition circuit is connected to the other input end of the division circuit, the output end of the division circuit is connected to the input end of the square root circuit, and the output end of the square root circuit is connected to a microprocessor.

3. The rapid electrical fire protection and current limiting protection device according to claim 1 is characterized in that: The zero-crossing detection module includes a voltage compensation circuit and a zero-crossing detection circuit. The zero-crossing detection circuit uses a high-speed photoelectric coupler for detection, and the output end of the high-speed photoelectric coupler is connected to a microprocessor; the voltage compensation circuit is used to compensate for the forward voltage drop of the high-speed photoelectric coupler, the input end of the voltage compensation circuit is connected in parallel with the load circuit, and the output end of the voltage compensation circuit is connected to the input end of the zero-crossing detection circuit.

4. The rapid electrical fire protection and current limiting protection device according to claim 1 is characterized in that: It also includes a valid value acquisition module and a key input module: The effective value acquisition module is used to process the load current to obtain the effective value of the load current, the input end of the effective value acquisition module is connected to the output end of the current sensor, and the output end of the effective value acquisition module is connected to the microprocessor; The key input module is used to set the reference overload threshold and control the reset of the main control switch, and the key input module is connected to the microprocessor; The microprocessor refreshes the collected current effective value once every half-wave. At the same time, the microprocessor refreshes the overload threshold from the key input module once every half-wave, and compares the current effective value with the overload threshold. When the current effective value exceeds the overload threshold for n consecutive times, the microprocessor determines that the load circuit is overloaded and controls the main control switch to disconnect.

5. The rapid electrical fire protection and current limiting protection device according to claim 4 is characterized in that: The effective value acquisition module includes a low-pass filter circuit, a fourth precision full-wave rectifier circuit and a capacitor filter circuit which are connected in series in sequence. The input end of the low-pass filter circuit is connected to the output end of the current sensor, and the output end of the capacitor filter circuit is connected to the microprocessor.

6. The rapid electrical fire protection and current limiting protection device according to claim 4 is characterized in that: It also includes a display module, which is used to display the reference overload threshold and whether the line is short-circuited or overloaded. The input end of the display module is connected to the microprocessor.

7. The rapid electrical fire protection and current limiting protection device according to claim 4 is characterized in that: It also includes an alarm module, which is used to send out sound and light alarm signals when a short circuit or overload occurs in the load circuit, and the input end of the alarm module is connected to the microprocessor.

8. The rapid electrical fire protection and current limiting protection device according to claim 7 is characterized in that: It also includes a communication module, which is used to complete human-computer interaction and send alarm information, and the communication module is connected to the microprocessor.

9. The rapid electrical fire protection and current limiting protection device according to claim 1 is characterized in that: It also includes a driving module, the input end of the driving module is connected to the microprocessor, and the output end of the driving module is connected to the main control switch.

10. The rapid electrical fire protection and current limiting protection device according to claim 1 is characterized in that: It also includes an auxiliary power supply module, which provides power with different voltages for the entire device, and the output end of the auxiliary power supply module is connected to the microprocessor.

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