A leakage fire alarm fault detector and a detection method thereof

Abstract

The application discloses a leakage fire alarm fault detector and a detection method thereof. The detection instrument comprises a leakage current simulation circuit and a fault detection circuit. The leakage current simulation circuit comprises a storage battery, a switch, an inverter and a potentiometer connected to form a loop. The output loop of the inverter is composed of an inner wire and an outer wire. The outer wire is connected to the inner wire through a connector around the AC transformer. The potentiometer is used to adjust the size of the output analog leakage current. The fault detection circuit comprises a single-chip microcomputer, a digital display ammeter, a liquid crystal display and a keyboard connected to the single-chip microcomputer. The single-chip microcomputer is connected to the storage battery. The single-chip microcomputer stores the analog leakage current value of the leakage current simulation circuit triggering the leakage fire alarm to generate an alarm and compares the triggering analog leakage current value with a standard leakage current value to determine whether the leakage fire alarm is faulty. The application can be judged online, and has rapidity and accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building engineering, in particular to a leakage fire alarm fault detector and a detection method thereof. BACKGROUND

[0002] In the building mechanical and electrical installation industry, the fire caused by the aging of electrical components and cables and the damage of equipment accounts for a large proportion in the large building fires in recent years. Therefore, a leakage fire alarm is installed in the electrical circuit of the power supply system to detect the residual current value in the electrical circuit and collect the signal to the monitoring host. The leakage fire alarm is also called a leakage fire alarm detector. The leakage fire alarm can only detect whether the electrical circuit signal is offline and whether the residual current is excessive. When the signal shows that the residual current is excessive, the leakage alarm is issued. However, when the leakage fire alarm system fails, it may not alarm, false alarm, alarm threshold deviation, etc. At this time, the leakage fire alarm cannot detect whether there is a leakage phenomenon in the electrical circuit, and cannot truly reflect whether there is a leakage fire hazard caused by a leakage accident in the electrical circuit. Therefore, how to judge whether the leakage fire alarm is faulty becomes a technical problem to be solved in the field. SUMMARY

[0003] The purpose of the present application is to provide a leakage fire alarm fault detector and a detection method thereof to solve the problem of how to judge whether the leakage fire alarm is faulty.

[0004] In order to achieve the above-mentioned purpose, the present application provides a leakage fire alarm fault detector, comprising:

[0005] A leakage current simulation circuit is used to output an analog leakage current and load it on the leakage fire alarm through the AC transformer of the leakage fire alarm detection circuit, comprising a storage battery, a switch, an inverter and a potentiometer connected to form a loop. The switch is connected to the power supply circuit of the storage battery. The output circuit of the inverter is composed of an inner wire and an outer wire. The outer wire surrounds the AC transformer and is connected to the inner wire through a connector. The potentiometer is connected to the inner wire. The potentiometer is a load of the output circuit of the inverter, and is used to adjust the size of the analog leakage current output by the output circuit of the inverter.

[0006] The fault detection circuit comprises a single-chip microcomputer and a digital electric meter, a liquid crystal display screen and a keyboard connected thereto, the single-chip microcomputer is connected with the battery circuit, the digital electric meter is connected on the inner wiring for detecting the value of the analog leakage current output by the leakage current analog circuit, the liquid crystal display screen is used for displaying the analog leakage current value detected by the digital electric meter, the single-chip microcomputer stores the analog leakage current value triggering the leakage fire alarm to alarm in different positions through keyboard coding and compares the triggering analog leakage current value with the standard leakage current value to determine whether the leakage fire alarm fails.

[0007] Further, the leakage fire alarm fault detection instrument provided by the present application further comprises:

[0008] A digital current meter is used to replace the digital electric meter.

[0009] Further, the leakage fire alarm fault detection instrument provided by the present application, the digital electric meter is further used for detecting the AC voltage signal of the output loop of the inverter and displaying on the liquid crystal display screen to determine the power of the battery.

[0010] Further, the leakage fire alarm fault detection instrument provided by the present application further comprises:

[0011] A digital current meter and a digital voltage meter are used to replace the digital electric meter.

[0012] Further, the leakage fire alarm fault detection instrument provided by the present application further comprises:

[0013] A shell, the battery, the inverter, the potentiometer, the digital electric meter are located in the shell, the switch, the liquid crystal display screen and the keyboard are arranged on the shell;

[0014] A knob is installed on the potentiometer and arranged on the shell.

[0015] A power indicator light is connected to the power supply circuit of the battery, and the power indicator light is arranged on the shell.

[0016] Further, the leakage fire alarm fault detection instrument provided by the present application, the fault detection circuit further comprises:

[0017] A data interface is connected with the single-chip microcomputer, and the data interface is arranged on the shell.

[0018] Further, the leakage fire alarm fault detection instrument provided by the present application, the connector is arranged on the shell.

[0019] In order to achieve the above-mentioned purpose, the application further provides a detection method of the leakage fire alarm fault detector,

[0020] The leakage fire alarm fault detector is turned off through the switch, and the potentiometer is adjusted to the maximum value;

[0021] The external wire of the leakage current simulation circuit is connected to the AC transformer of the leakage fire alarm detection loop and connected to the internal wire;

[0022] The leakage fire alarm fault detector is turned on through the switch, and the size of the simulated leakage current output by the leakage current simulation circuit is gradually increased through the potentiometer until the simulated leakage current triggers the leakage fire alarm to generate an alarm, and the simulated leakage current value triggering the leakage fire alarm to generate an alarm is referred to as the first triggered simulated leakage current value;

[0023] The first triggered simulated leakage current value is stored in the single-chip microcomputer of the fault detection circuit through keyboard coding;

[0024] The leakage fire alarm fault detector is turned off through the switch, and the potentiometer is adjusted to the maximum value;

[0025] The alarm of the leakage fire alarm is released;

[0026] The two ends of the external wire are reversely connected to the internal wire;

[0027] The leakage fire alarm fault detector is turned on through the switch, and the size of the simulated leakage current output by the leakage current simulation circuit is gradually increased through the potentiometer until the simulated leakage current triggers the leakage fire alarm to generate an alarm, and the simulated leakage current value triggering the leakage fire alarm to generate an alarm is referred to as the second triggered simulated leakage current value;

[0028] The second triggered simulated leakage current value is stored in the single-chip microcomputer of the fault detection circuit through keyboard coding;

[0029] The single-chip microcomputer of the fault detection circuit compares the average value of the two triggered simulated leakage current values with the standard leakage current value to determine whether the leakage fire alarm is faulty;

[0030] When (Ia+Ib) / 2<Is, it is confirmed that the leakage fire alarm is normal, otherwise it is confirmed that the leakage fire alarm is faulty, wherein Ia is the first triggered simulated leakage current value, Ib is the second triggered simulated leakage current value, and Is is the standard leakage current value.

[0031] Further, the application provides a detection method of the leakage fire alarm fault detector,

[0032] The single-chip microcomputer exports the detection result of the electric leakage fire alarm detector through a data interface.

[0033] Further, the application provides a detection method of the electric leakage fire alarm detector fault detector.

[0034] Compared with the prior art, the application has the following beneficial effects:

[0035] The electric leakage fire alarm detector fault detector and the detection method thereof can load the simulated electric leakage current output by the electric leakage current simulation circuit to the AC transformer of the electric leakage fire alarm detector detection circuit, and the AC transformer can load the simulated electric leakage current to the electric leakage fire alarm detector.

[0036] The detection method of the electric leakage fire alarm detector fault detector can connect the external wires of the electric leakage current simulation circuit to the internal wires in the positive and negative directions twice, determine the average value of the triggered simulated electric leakage current value through the single-chip microcomputer, and then compare the average value of the triggered simulated electric leakage current value with the standard electric leakage current value through the single-chip microcomputer to determine whether the electric leakage fire alarm detector has a fault.

[0037] The electric leakage fire alarm detector fault detector and the detection method thereof can determine that no electric leakage occurs in the detection circuit and the corresponding electric circuit of the electric leakage fire alarm detector when the detection result determines that the electric leakage fire alarm detector is normal and the electric leakage fire alarm detector does not have an alarm, and the possibility of a fire caused by electric leakage does not exist.

[0038] The electric leakage fire alarm detector fault detector and the detection method thereof can be used for online judgment, and the detection operation is simple, convenient and fast. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is the internal circuit structure diagram of the leakage fire alarm fault detector;

[0040] Figure 2 is the block schematic diagram of the leakage fire alarm fault detector;

[0041] Figures 3-4 is the three-dimensional structure schematic diagram of the leakage fire alarm fault detector;

[0042] Figure 5 is the structure schematic diagram of the leakage fire alarm fault detector in use state;

[0043] The drawings show:

[0044] 100, leakage fire alarm fault detector;

[0045] 110, leakage current simulation circuit, 111, battery, 112, switch, 113, inverter, 114, potentiometer, 115, power indicator, 116, internal wiring, 117, external wiring, 118, connector;

[0046] 120, fault detection circuit, 121, single-chip microcomputer, 122, digital display ammeter, 123, liquid crystal display screen, 124, keyboard, 125, data interface;

[0047] 130, shell;

[0048] 140, knob;

[0049] 200, leakage fire alarm detection circuit, 210, AC transformer, 220, leakage fire alarm, 230, circuit breaker, 240, zero line terminal row. DETAILED DESCRIPTION

[0050] The present application will be described in detail below with reference to the drawings: according to the following description, the advantages and features of the present application will be more apparent. It should be noted that the drawings are very simplified and all use non-precise proportions, only to facilitate, clear to assist in the purpose of explaining the embodiments of the present application.

[0051] Please refer to Figures 1-5 , the present application provides a leakage fire alarm fault detector 100, comprising leakage current simulation circuit 110 and fault detection circuit 120, wherein:

[0052] The leakage current simulation circuit 110, which is used to output analog leakage current and loaded on the leakage fire alarm 220 through the AC transformer 210 of the leakage fire alarm detector loop 200, comprises a storage battery 111, a switch 112, an inverter 113 and a potentiometer 114 which constitute the loop connection, the switch 112 is connected on the power supply circuit of the storage battery 111, the output loop of the inverter 113 is composed of an inner wire 116 and an outer wire 117, the outer wire 117 is connected on the inner wire 116 through a connector 118 around the AC transformer 210, the potentiometer 114 is connected on the inner wire 116, and the potentiometer 114 is the load of the output loop of the inverter 113 and is used to adjust the size of the analog leakage current output by the output loop of the inverter 113. Wherein the output loop of the inverter 113 is the potentiometer 114 connected on the output end of the inverter 113 with the inner wire 116 and the outer wire 117. Wherein the switch 112 can be a jump switch.

[0053] The fault detection circuit 120 comprises a single-chip microcomputer 121 and its connected digital display ammeter 122, liquid crystal display screen 123 and keyboard 124, the single-chip microcomputer 121 is connected with the circuit of the storage battery 111, the digital display ammeter 122 is connected on the inner wire 116 and is used to detect the value of the analog leakage current output by the leakage current simulation circuit 110, the liquid crystal display screen 123 is used to display the analog leakage current value detected by the digital display ammeter 122, and the single-chip microcomputer 121 judges whether the leakage fire alarm 220 is in failure by encoding and storing the analog leakage current value of different positions of the leakage current simulation circuit 110 triggering the leakage fire alarm 220 to alarm and comparing the triggering analog leakage current value with the standard leakage current value.

[0054] Please refer to Figure 1 In order to monitor the power of the storage battery 111, the leakage fire alarm fault detector 100 provided by the embodiment of the present application, the digital display ammeter 122 is also used to detect the AC voltage signal of the output loop of the inverter 113 and display on the liquid crystal display screen 123, so as to judge the power of the storage battery 111. That is, the output voltage value of the inverter 113 is compared with the output voltage value of the storage battery 111 to judge the power of the storage battery 111. Therefore, the power of the storage battery 111 can be judged through the AC voltage signal of the output loop of the inverter 113. Wherein the digital display ammeter 122 can measure the AC voltage signal and the AC current signal.

[0055] In order to achieve the purpose of the present application, the leakage fire alarm fault detector 100 provided by the embodiment of the present application can further comprise:

[0056] Digital ammeter, used to replace the digital voltmeter 122. That is, the digital ammeter can replace the digital voltmeter 122 without considering monitoring the power of the battery 111.

[0057] In order to achieve the purpose of measuring the alternating current signal and the alternating voltage signal, the leakage fire alarm fault detector 100 provided by the embodiment of the present application can further comprise:

[0058] Digital ammeter and digital voltmeter, used to replace the digital voltmeter 122. That is, the digital ammeter and the digital voltmeter replace the integrated digital voltmeter 122.

[0059] Please refer to Figure 1 , Figures 3-4 In order to improve the safety and convenience, the leakage fire alarm fault detector 100 provided by the embodiment of the present application can further comprise:

[0060] The housing 130, the battery 111, the inverter 113, the potentiometer 114, the digital voltmeter 122 are located in the housing 130, and the switch 112, the liquid crystal display 123 and the keyboard 124 are arranged on the housing 130,

[0061] The knob 140 is installed on the potentiometer 114 and arranged on the housing 130.

[0062] The power indicator 115 is connected to the power supply circuit of the battery 111, and the power indicator 115 is arranged on the housing 130. The power indicator 115 can determine whether the power supply of the detector 100 is normal. Of course, when there is no power indicator 115, whether the liquid crystal display 123 is lit can also be used to determine whether the power supply of the detector 100 is normal.

[0063] Please refer to Figure 1 In order to facilitate finding the installation position of the leakage fire alarm 220 which has failed, the leakage fire alarm fault detector 100 provided by the present application can further comprise:

[0064] The data interface 125 is connected with the single-chip microcomputer, and the data interface 125 is arranged on the housing 130. Through the data interface 125, the leakage fire alarm 220 which has failed at different positions in the building can be found out and the maintenance personnel can be notified to repair, repair and replace.

[0065] Please refer to Figure 1 、 Figure 3 and Figure 5In order to facilitate the external wire 117 to be connected to the internal wire 116, the leakage fire alarm fault detector 100 provided by the embodiment of the present application is provided with the connector 118 arranged on the shell 130. The connector 118 can be a common electrical interface or a terminal post.

[0066] Please refer to Figures 1-5 The embodiment of the present application further provides a detection method of the leakage fire alarm fault detector 100, which can include the following steps:

[0067] In step S301, the leakage fire alarm fault detector 100 is turned off by the switch 112, and the potentiometer 114 is adjusted to the maximum value. At this time, the output analog leakage current is minimum.

[0068] In step S302, the external wire 117 of the leakage current simulation circuit 110 is passed through the AC transformer 210 of the leakage fire alarm detection circuit 200 and connected to the internal wire 116. The leakage fire alarm detection circuit 200 includes the AC transformer 210 on the power grid through the live wire L and the neutral wire N and the leakage fire alarm 220 connected to the AC transformer 210. The live wire L is usually connected to the circuit breaker 230 in the electrical control box, and the neutral wire N is usually installed on the neutral terminal strip 240 in the electrical control box. The electrical control box is installed in the building.

[0069] In step S303, the leakage fire alarm fault detector 100 is turned on by the switch 112, and the size of the analog leakage current output by the leakage current simulation circuit 110 is gradually increased by the potentiometer 114 controlled by the knob 140 until the analog leakage current triggers the leakage fire alarm 220 to alarm. The analog leakage current value triggering the leakage fire alarm 220 to alarm is referred to as the first triggering analog leakage current value.

[0070] In step S304, the first triggering analog leakage current value is stored in the single-chip microcomputer 121 of the fault detection circuit 120 by the keyboard 124 coding.

[0071] In step S305, the leakage fire alarm fault detector 100 is turned off by the switch 112, and the potentiometer 114 is adjusted to the maximum value.

[0072] In step S306, the alarm of the leakage fire alarm 220 is released.

[0073] In step S307, the two ends of the external wire 117 are reversely connected to the internal wire 116. That is, the external wire 117 is connected as a positive wire in the previous connection and as a reverse wire in the present connection.

[0074] Step S308, open the leakage fire alarm fault detector 100 through the switch 112, gradually increase the size of the analog leakage current output by the leakage current analog circuit 110 through the potentiometer 114, until the output analog leakage current triggers the leakage fire alarm 220 to alarm, the analog leakage current value that triggers the leakage fire alarm 220 to alarm is called the second trigger analog leakage current value.

[0075] Step S309, store the second trigger analog leakage current value in the single-chip microcomputer 121 of the fault detection circuit 120 by the keyboard 124 coding.

[0076] Step S310, the single-chip microcomputer 121 of the fault detection circuit 120 compares the average value of the two trigger analog leakage current values with the standard leakage current value to determine whether the leakage fire alarm 220 is faulty. When (Ia+Ib) / 2<Is, it is confirmed that the leakage fire alarm 220 is normal, otherwise it is confirmed that the leakage fire alarm 220 is faulty, wherein Ia is the first trigger analog leakage current value, Ib is the second trigger analog leakage current value, and Is is the standard leakage current value. The standard leakage current value Is is 500mA, of course, it can also be adjusted according to the needs.

[0077] In order to realize the export of the information of the faulty leakage fire alarm 220, the detection method of the leakage fire alarm fault detector 100 provided by the embodiment of the present application can further include:

[0078] Step S311, the single-chip microcomputer 121 exports the detection result of the leakage fire alarm detector 100 through the data interface 125. The data can be exported to a computer in table form, and the faults can be summarized and distributed to maintenance personnel for repair.

[0079] In order to distinguish the trigger analog leakage current values of leakage fire alarms at different positions, the detection method of the leakage fire alarm fault detector 100 provided by the embodiment of the present application, the keyboard 124 is a 12-bit keyboard 124, and the trigger analog leakage current values of leakage fire alarms at different positions are recorded by the keyboard 124 coding.

[0080] The leakage fire alarm fault detector 100 and the detection method thereof provided by the embodiment of the present application, the analog leakage current output by the leakage current simulation circuit 110 is loaded on the AC transformer 210 of the leakage fire alarm detection circuit 200, the AC transformer 210 loads the analog leakage current on the leakage fire alarm 220, the leakage fire alarm 220 judges whether to alarm according to the loaded analog leakage current value, and the fault detection circuit 120 compares the trigger analog leakage current value of the leakage fire alarm 220 with the standard leakage current value to judge whether the leakage fire alarm 220 is faulty.

[0081] The detection method of the leakage fire alarm fault detector 100 provided by the embodiment of the present application, the external connection line 117 of the leakage current simulation circuit 110 is connected to the internal connection line 116 in the positive and negative directions twice to determine the average value of the trigger analog leakage current value by the single-chip microcomputer 121, and then the average value of the trigger analog leakage current value is compared with the standard leakage current value by the single-chip microcomputer 121 to judge whether the leakage fire alarm 220 is faulty, which can avoid the analog leakage current in the same direction being loaded on the leakage fire alarm detection circuit 200, can correct the current deviation of the detection circuit, and thus improves the accuracy of judging whether the leakage fire alarm 220 is faulty.

[0082] The leakage fire alarm fault detector 100 and the detection method thereof provided by the embodiment of the present application, when the detection result determines that the leakage fire alarm 220 is normal and the leakage fire alarm 220 does not alarm, it can be judged that there is no leakage on the detection circuit and the corresponding electric circuit of the leakage fire alarm 220, and there is no possibility of fire caused by leakage; when the detection result determines that the leakage fire alarm 220 is faulty, it cannot accurately reflect whether there is leakage current on the electric circuit, and there may be a fire safety hazard caused by leakage, so the leakage fire alarm 220 should be maintained or replaced in time to monitor the fire safety hazard of the electric circuit and the power grid, and reduce the electrical fire hazard caused by leakage in buildings, factories and the like.

[0083] The leakage fire alarm fault detector 100 and the detection method thereof provided by the embodiment of the present application can be judged online, the detection operation is simple, convenient and fast, and there is no need to disconnect the detection circuit or the electric circuit to detect the leakage fire alarm 220 offline, which reduces the installation and maintenance cost of the leakage fire alarm detection circuit of the operating personnel.

[0084] The electric leakage fire alarm fault detector 100 and the detection method thereof provided by the embodiment of the present application utilize the principle of calculating the electric leakage current size by using the zero sequence current vector sum in the electric leakage fire alarm detection circuit 200. In the operation, an additional same direction adjustable AC current (i.e. simulating the electric leakage current) is applied to the AC transformer 210 by human, and the current size is gradually increased to promote the zero sequence current vector sum in the AC transformer 210 to gradually increase and exceed the alarm threshold of the electric leakage fire alarm 220, and whether the electric leakage fire alarm 220 can generate the alarm by itself or what current size can make the electric leakage fire alarm 220 generate the alarm is observed.

[0085] The present application is not limited to the above specific embodiments, and obviously, the above described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application. Those skilled in the art can make other levels of modifications and changes to the present application. Thus, if these modifications and changes of the present application belong to the scope of the claims of the present application, the present application also intends to include these modifications and changes.

Claims

1. A fault detector for a leakage current fire alarm, characterized in that, include: A leakage current simulation circuit is used to output a simulated leakage current and load it onto a leakage current fire alarm via an AC transformer in the detection circuit of the leakage current fire alarm. It includes a battery, a switch, an inverter, and a potentiometer forming a circuit connection. The switch is connected to the power supply line of the battery. The output circuit of the inverter consists of an internal wiring and an external wiring. The external wiring surrounds the AC transformer and is connected to the internal wiring via a connector. The potentiometer is connected to the internal wiring and serves as the load for the output circuit of the inverter, used to adjust the magnitude of the simulated leakage current output by the inverter's output circuit. The fault detection circuit includes a microcontroller and its connected digital display meter, LCD screen, and keyboard. The microcontroller is connected to the battery, and the digital display meter is connected to the internal wiring to detect the value of the simulated leakage current output by the leakage current simulation circuit. The LCD screen is used to display the simulated leakage current value detected by the digital display meter. The microcontroller stores the simulated leakage current values ​​at different locations triggered by the leakage current simulation circuit to activate the leakage current fire alarm via keyboard encoding, and compares the triggered simulated leakage current value with the standard leakage current value to determine whether the leakage current fire alarm has malfunctioned.

2. The fault detector for leakage current fire alarms according to claim 1, characterized in that, Also includes: A digital ammeter is used to replace the digital display ammeter.

3. The fault detector for leakage current fire alarms according to claim 1, characterized in that, The digital display meter is also used to detect the AC voltage signal of the inverter's output circuit and display it on the LCD screen to determine the battery's charge level.

4. The fault detector for leakage current fire alarms according to claim 3, characterized in that, Also includes: Digital ammeters and digital voltmeters are used to replace the digital display meters.

5. The fault detector for leakage current fire alarms according to claim 1, characterized in that, Also includes: The battery, inverter, potentiometer, and digital display meter are located inside the housing, while the switch, LCD screen, and keyboard are mounted on the housing. A knob is mounted on the potentiometer and is disposed on the housing; A power indicator light is connected to the power supply line of the battery and is located on the housing.

6. The fault detector for leakage current fire alarms according to claim 5, characterized in that, The fault detection circuit also includes: A data interface is provided, which is connected to the microcontroller and is located on the housing.

7. The fault detector for leakage current fire alarms according to claim 5, characterized in that, The connector is mounted on the housing.

8. A detection method for a fault detector for a leakage current fire alarm according to claim 1, characterized in that, Turn off the fault detector of the leakage current fire alarm by switching it off, and adjust the potentiometer to the maximum value; The external wiring of the leakage current simulation circuit is passed through the AC transformer of the leakage current fire alarm detection circuit and connected to the internal wiring. Turn on the fault detector of the leakage current fire alarm by switching on the switch, and gradually increase the magnitude of the simulated leakage current output by the leakage current simulation circuit by adjusting the potentiometer until the output simulated leakage current triggers the leakage current fire alarm to alarm. The simulated leakage current value that triggers the leakage current fire alarm to alarm is called the first trigger simulated leakage current value. The simulated leakage current value of the first trigger is stored in the microcontroller of the fault detection circuit through keyboard encoding. Turn off the fault detector of the leakage current fire alarm by switching it off, and adjust the potentiometer to the maximum value; To deactivate the residual current fire alarm; Reverse the two ends of the external wiring and connect them to the internal wiring; Turn on the fault detector of the leakage current fire alarm by switching on the switch, and gradually increase the magnitude of the simulated leakage current output by the leakage current simulation circuit by adjusting the potentiometer until the output simulated leakage current triggers the leakage current fire alarm to alarm. The simulated leakage current value that triggers the leakage current fire alarm to alarm is called the second trigger simulated leakage current value. The simulated leakage current value of the second trigger is stored in the microcontroller of the fault detection circuit through keyboard encoding. The microcontroller in the fault detection circuit compares the average value of the simulated leakage current value from two triggers with the standard leakage current value to determine whether the leakage fire alarm has malfunctioned. When (Ia+Ib) / 2 < Is, the leakage current fire alarm is confirmed to be normal; otherwise, the leakage current fire alarm is confirmed to be faulty. Where Ia is the simulated leakage current value of the first trigger, Ib is the simulated leakage current value of the second trigger, and Is is the standard leakage current value.

9. The detection method of the fault detector for leakage current fire alarm according to claim 8, characterized in that, The microcontroller exports the detection results of the leakage current fire alarm detector through the data interface.

10. The detection method of the fault detector for leakage current fire alarm according to claim 8, characterized in that, The keyboard is a 12-bit coded keyboard, which records the simulated leakage current value triggered by the leakage current fire alarm at different locations through keyboard encoding.

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