Secondary fault discriminator for circuit breaker cabinet

Abstract

The utility model discloses a breaker cabinet secondary fault discriminator which is characterized in that the breaker cabinet secondary fault discriminator comprises a box body module, an interface module, a man-machine interaction module, a wireless transmission module, an indication module, a power supply module and a control module are arranged in the box body module, the discriminator is simple in structure, and faults of an intelligent electric meter can be rapidly discriminated; the man-machine interaction module is convenient to use and can quickly switch function options; locking among options can be realized, that is, only one test item can be tested at the same time, the interface module can be firmly and reliably connected with the switch, and the state quantity transmission of the switch is stable; the indication module can visually display the working state of the coil and can display the on-off condition of a switch auxiliary node, and the LED indication lamp and 8-shaped display screen module is low in cost, simple to manufacture and high in practicability; the liquid crystal display screen is good in display effect and high in development difficulty.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary fault discriminators, in particular to a secondary fault discriminator for a circuit breaker cabinet. Background Art

[0002] At present, a low-voltage circuit breaker is a switching electrical appliance that can not only connect and disconnect normal load current and overload current, but also connect and disconnect short-circuit current. In addition to playing a control role in the circuit, the low-voltage circuit breaker also has certain protection functions, such as overload, short-circuit, undervoltage and leakage protection. There are many classification methods for low-voltage circuit breakers. Classified by usage category, there are selective and non-selective types. Classified by arc extinguishing medium, there are air type and vacuum type. The capacity range of low-voltage circuit breakers is very large, with the minimum being 4A and the maximum reaching 5000A. Low-voltage circuit breakers are widely used in the outgoing lines at all levels of low-voltage distribution systems, the power control of various mechanical equipment, and the control and protection of power consumption terminals.

[0003] At present, the low-voltage communication medium of the low-voltage power consumption information acquisition system in the power system mainly uses low-voltage power lines and uses low-voltage carrier communication technology to collect data.

[0004] In such a power consumption information acquisition system, first, an intelligent meter uploads information such as meter number, electricity consumption, and amount to a collector installed on the low-voltage side of the corresponding substation area through a built-in carrier module with the power line as the carrier; then, the collector uploads the information to the acquisition master station through the GPRS signal method.

[0005] With the use of intelligent meters, the marketing low-voltage management mode has changed accordingly. The management of users is carried out daily. The user information collected remotely is analyzed every day to understand the user's power consumption status and timely handle the problems found. This places very high requirements on the timeliness and accuracy of remotely collected data. At present, the success rate of collecting low-voltage user power consumption information has become a bottleneck restricting this new management mode. The success rate of collecting low-voltage user power consumption information in the power system cannot reach 100%. This is mainly because the signal method used in low-voltage carrier communication technology modulates data signals onto 220 / 380V low-voltage power lines. Affected by fluctuations and impacts such as the amplitude and frequency of the power network, as well as the attenuation characteristics of inductive devices themselves, the carrier communication module in the intelligent meter has become the main vulnerable component in the system, thereby reducing the overall data collection success rate of the collection system. Moreover, this impact is long-term and continuous.

[0006] At present, the solution to the unsuccessful remote transmission of smart meters is as follows: First, analyze the basic files. After ensuring they are correct, arrange for technical personnel from the manufacturer of the carrier module of the corresponding centralized controller and power operation and maintenance staff to conduct on-site verification. Use the debugging equipment of our company for debugging. Staff need to carry testing equipment with two different carrier modes and infrared testing equipment for smart meters with unsuccessful collection to determine faults. However, traditional testing equipment requires the use of special receiving instruments or laptop computers and connection to the carrier communication module. Infrared testing also requires another set of equipment. Carrying, connecting, and implementing tests on-site are all very troublesome. On average, it takes 20 minutes to test one smart meter. Moreover, due to the large number of components in the wiring circuit, it must be guided by professional technical personnel and cannot be used on a large scale. In actual use, because there are many types of traditional testing equipment, it is not easy to prepare and carry, often resulting in the phenomenon that on-site personnel uniformly determine faulty smart meters as whole-meter faults and replace them, causing a large waste of equipment funds. The equipment and labor costs for replacing one smart meter are 8 - 10 times higher than those for replacing one carrier module. This does not include the losses caused to users by power outages when replacing smart meters, the unnecessary troubles brought to users by service changes after meter replacement, and the immeasurable negative impacts on the quality of smart meters caused by repeated meter replacements. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a secondary fault discriminator for a circuit breaker cabinet in view of the deficiencies of the background technology. The discriminator has a simple structure and can quickly discriminate the faults of smart electric meters.

[0008] The following technical solutions are adopted by this utility model to solve the above technical problems:

[0009] A secondary fault discriminator for a circuit breaker cabinet includes a box body module. An interface module, a human-computer interaction module, a wireless transmission module, an indication module, a power supply module, and a control module are arranged in the box body module. The interface module, the human-computer interaction module, the wireless transmission module, the indication module, and the power supply module are respectively connected to the control module. The power supply module is respectively connected to the interface module, the human-computer interaction module, the wireless transmission module, the indication module, and the control module to provide the required electric energy.

[0010] As a further preferred solution of the secondary fault discriminator for a circuit breaker cabinet of this utility model, the power supply module includes an EMI filtering module, an AC / DC conversion module, a high-frequency transformer, a loop compensation module, a charging control circuit, and a rechargeable battery. The EMI filtering module, the AC / DC conversion module, the high-frequency transformer, the loop compensation module, the charging control circuit, and the rechargeable battery are sequentially connected in order.

[0011] As a further preferred solution of a secondary fault discriminator for a circuit breaker cabinet of the present utility model, the indication module adopts an LED indicator light + an eight-segment liquid crystal display screen.

[0012] As a further preferred solution of a secondary fault discriminator for a circuit breaker cabinet of the present utility model, the cabinet body material of the cabinet body module adopts PVC material, and the panel of the cabinet body module adopts a PVC panel.

[0013] As a further preferred solution of a secondary fault discriminator for a circuit breaker cabinet of the present utility model, the EMI filtering module includes a common mode inductor, an X capacitor, a Y capacitor and a discharge resistor;

[0014] The common mode inductor is composed of two coils wound in the same direction and is used to eliminate the differential current in the loop;

[0015] The X capacitor is connected in parallel on both sides of the common mode inductor and is used to eliminate differential mode interference;

[0016] The Y capacitor is connected across the output end and the midpoint of the series connection is grounded and is used to suppress common mode interference; the discharge resistor is used to eliminate the static electricity accumulation in the filter.

[0017] As a further preferred solution of a secondary fault discriminator for a circuit breaker cabinet of the present utility model, the charging control circuit includes a signal control terminal, a charging power supply terminal, a device power supply terminal, a battery terminal, a triode, a first MOS transistor and a second MOS transistor; wherein, the charging power supply terminal is grounded through a series-connected first resistor and a second resistor; the base of the triode is respectively connected to the signal control terminal and the charging power supply terminal, the collector of the triode is connected to the gate of the second MOS transistor through a fourth resistor, and is also connected to the source of the first MOS transistor through a third resistor, and the emitter of the triode is grounded; the source of the second MOS transistor is connected to the charging power supply terminal through a first diode, and the drain is connected to the device power supply terminal; the source of the first MOS transistor is connected to the charging power supply terminal through a first diode, the gate is connected to the connection point of the first resistor and the second resistor, and the drain is connected to the battery terminal.

[0018] As a further preferred solution of a secondary fault discriminator for a circuit breaker cabinet of the present utility model, the wireless transmission module includes an antenna ANT1, capacitors C1, C2, C3, C4, C5, C6, resistors R1, R2, inductors L1, L2, chips U1, U2, U3, and a VDD terminal; wherein, one end of the antenna ANT1 is respectively connected to one end of the inductor L1 and one end of the capacitor C6, the other end of the inductor L1 is grounded, the other end of the capacitor C6 is respectively connected to one end of the inductor L2 and pin 2 of the chip U1, the other end of the inductor L2 is grounded, pin 3 and pin 4 of the chip U1 are respectively connected to one end of the capacitor C4, one end of the capacitor C5 and the VDD terminal, the other ends of the capacitor C4 and the capacitor C5 are respectively grounded, pin 1 of the chip U1 is respectively connected to one end of the capacitor C3, the VDD terminal, pin 30 and pin 29 of the chip U1, the other end of the capacitor C3 is grounded, pin 31 of the chip U1 is connected to one end of the resistor R1, the other end of the resistor R1 is grounded, pin 28 of the chip U1 is respectively connected to one end of the capacitor C1 and pin 1 of the chip U2, pin 2 of the chip U2 is grounded, the other end of the capacitor C1 is grounded, pin 4 of the chip U2 is grounded, pin 3 of the chip U2 is respectively connected to one end of the capacitor C2 and pin 27 of the chip U1, the other end of the capacitor C2 is grounded, pin 18 of the chip U1 is connected to pin 7 of the chip U3, pin 19 of the chip U1 is connected to pin 3 of the chip U3, pin 20 of the chip U1 is connected to pin 1 of the chip U3, pin 21 of the chip U1 is connected to pin 6 of the chip U3 through the resistor R2, pin 22 of the chip U1 is connected to pin 2 of the chip U3, pin 23 of the chip U1 is connected to pin 5 of the chip U3, and pin 17 of the chip U1 is respectively connected to pin 11 of the chip U1 and the VDD terminal.

[0019] As a further preferred solution of a secondary fault discriminator for a circuit breaker cabinet of the present utility model, the interface module includes the DALI_RX terminal of the MCU, the DALI_TX terminal of the MCU, the VCC voltage terminal, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the first diode, the second diode, the third diode, the first zener diode, the first triode, the second triode, the third triode, the LM317 chip, the voltage stabilization control chip, the first capacitor, the second capacitor, and the third capacitor; wherein, the VCC voltage terminal is respectively connected to one end of the first capacitor, the Vin terminal of the voltage stabilization control chip, and the negative electrode of the first diode. The positive electrode of the first diode is respectively connected to the V0 terminal of the voltage stabilization control chip, the positive electrode of the first diode, the negative electrode of the second diode, and the DA+ terminal. The other end of the first resistor is respectively connected to one end of the second resistor, the ADJ terminal of the voltage stabilization control chip, the positive electrode of the second diode, and one end of the second capacitor. The other end of the second resistor is respectively connected to the other end of the second capacitor, the other end of the first capacitor, the DA- terminal and grounded; the DA+ terminal is respectively connected to the gate of the third triode, one end of the seventh resistor, and the negative electrode of the zener diode. The positive electrode of the zener diode is respectively connected to one end of the fifth resistor and one end of the sixth resistor. The other end of the fifth resistor is respectively connected to the negative electrode of the third diode, one end of the fourth resistor, and the 5V voltage terminal through the first triode. The positive electrode of the third diode is respectively connected to the DALI_RX terminal of the MCU and one end of the third resistor. The other end of the third resistor is connected to the 3.3V voltage terminal. The gate of the third triode is respectively connected to one end of the tenth resistor and the collector of the second triode through the eleventh resistor. The other end of the tenth resistor is connected to the 5V voltage terminal. The base of the second triode is connected to one end of the eighth resistor and the DALI_TX terminal of the MCU through the ninth resistor. The other end of the eighth resistor is connected to the 3.3V voltage terminal. The other end of the fourth resistor, the other end of the sixth resistor, the other end of the seventh resistor, the emitter of the second triode, and the DA- terminal are mutually connected and grounded.

[0020] Compared with the prior art, the present utility model adopts the above technical solutions and has the following technical effects:

[0021] The secondary fault discriminator for a circuit breaker cabinet of the present utility model includes a box body module. An interface module, a human-computer interaction module, a wireless transmission module, an indication module, a power supply module, and a control module are provided inside the box body module. The discriminator has a simple structure and can quickly discriminate the faults of an intelligent electric meter; it is relatively easy to develop using a circuit board, has a simple principle, and operates reliably; the human-computer interaction module is convenient to use and can quickly switch function options; it can achieve locking between options, that is, only one test item can be tested at the same time. The interface module can firmly and reliably connect to the switch, and the switch status quantity is transmitted stably; the indication module can intuitively display the working state of the coil and can also display the on-off situation of the switch auxiliary node. The LED indicator + 8-digit display screen module has low cost, is simple to manufacture, and has strong practicability; the liquid crystal display screen scheme has good display effect but high development difficulty; the pointer electronic meter does not display data intuitively and has errors; the LED indicator + 8-digit display screen module has strong feasibility and is convenient for group development, so the LED indicator + 8-digit display screen module is selected; using a rechargeable battery has high reliability and can provide the stable voltage required by the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is the structural schematic diagram of the secondary fault discriminator for a circuit breaker cabinet of the present utility model;

[0024] Figure 2 is the schematic diagram of the power supply module of the secondary fault discriminator for a circuit breaker cabinet of the present utility model;

[0025] Figure 3 is the circuit diagram of the charging control circuit of the secondary fault discriminator for a circuit breaker cabinet of the present utility model;

[0026] Figure 4 is the circuit diagram of the wireless transmission module of the secondary fault discriminator for a circuit breaker cabinet of the present utility model;

[0027] Figure 5 is the circuit diagram of the interface module of the secondary fault discriminator for a circuit breaker cabinet of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will further elaborate on the technical solutions of the present utility model in conjunction with the drawings:

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] A secondary fault discriminator for a circuit breaker cabinet includes a box body module. Inside the box body module, there are an interface module, a human-machine interaction module, a wireless transmission module, an indication module, a power supply module, and a control module. The interface module, the human-machine interaction module, the wireless transmission module, the indication module, and the power supply module are respectively connected to the control module. The power supply module is respectively connected to the interface module, the human-machine interaction module, the wireless transmission module, the indication module, and the control module to provide the required electric energy. It is relatively easy to develop using a circuit board, with a simple principle and reliable operation; the human-machine interaction module is convenient to use and can quickly switch function options; it can achieve interlock between options, that is, only one test item can be tested at the same time. The interface module can firmly and reliably connect to the switch, and the switch status quantity is transmitted stably; the indication module can intuitively display the working state of the coil and can also display the on-off situation of the switch auxiliary node. The LED indicator + 8-digit display screen module has low cost, is simple to manufacture, and has strong practicability; the liquid crystal display screen scheme has good display effect but high development difficulty; the pointer-type electronic watch displays data not intuitively and has errors; the LED indicator + 8-digit display screen module has strong feasibility and is convenient for group development, so the LED indicator + 8-digit display screen module is selected; using a rechargeable battery has high reliability and can provide a stable voltage required by the device.

[0031] The power supply module includes an EMI filtering module, an AC / DC conversion module, a high-frequency transformer, a loop compensation module, a charging control circuit, and a rechargeable battery. The EMI filtering module, the AC / DC conversion module, the high-frequency transformer, the loop compensation module, the charging control circuit, and the rechargeable battery are connected in sequence.

[0032] The EMI filtering module includes a common-mode inductor, an X capacitor, a Y capacitor, and a discharge resistor;

[0033] The common-mode inductor is composed of two coils wound in the same direction and is used to eliminate the differential current in the loop;

[0034] The X capacitor is connected in parallel on both sides of the common-mode inductor and is used to eliminate differential-mode interference;

[0035] The Y capacitor is connected across the output terminal and the midpoint of the series connection is grounded and is used to suppress common-mode interference; the discharge resistor is used to eliminate the static electricity accumulation in the filter.

[0036] The charging control circuit includes a signal control terminal, a charging power supply terminal, a device power supply terminal, a battery terminal, a triode, a first MOS transistor, and a second MOS transistor; wherein, the charging power supply terminal is grounded through a series-connected first resistor and second resistor; the base of the triode is respectively connected to the signal control terminal and the charging power supply terminal, the collector of the triode is connected to the gate of the second MOS transistor through a fourth resistor, and is also connected to the source of the first MOS transistor through a third resistor, and the emitter of the triode is grounded; the source of the second MOS transistor is connected to the charging power supply terminal through a first diode, and the drain is connected to the device power supply terminal; the source of the first MOS transistor is connected to the charging power supply terminal through a first diode, the gate is connected to the connection point of the first resistor and the second resistor, and the drain is connected to the battery terminal.

[0037] The MOS transistor is used as a power device, and the power supply efficiency is high; when the device battery is charging, the battery power supply can be cut off and the power supply is used to supply power to the device to protect the battery and extend the battery life; the power on and off of the device can be controlled by hardware and software, and the device can also be reset through the hardware reset port, so that the device shuts down.

[0038] The wireless transmission module includes an antenna ANT1, capacitors C1, C2, C3, C4, C5, C6, resistors R1, R2, inductors L1, L2, chips U1, U2, U3, and a VDD terminal; wherein, the antenna ANT1 is respectively connected to one end of the inductor L1 and one end of the capacitor C6, the other end of the inductor L1 is grounded, the other end of the capacitor C6 is respectively connected to one end of the inductor L2 and pin 2 of the chip U1, the other end of the inductor L2 is grounded, pins 3 and 4 of the chip U1 are respectively connected to one end of the capacitor C4, one end of the capacitor C5, and the VDD terminal, the other ends of the capacitor C4 and the capacitor C5 are respectively grounded, pin 1 of the chip U1 is respectively connected to one end of the capacitor C3, the VDD terminal, pin 30 of the chip U1, and pin 29 of the chip U1, the other end of the capacitor C3 is grounded, pin 31 of the chip U1 is connected to one end of the resistor R1, the other end of the resistor R1 is grounded, pin 28 of the chip U1 is respectively connected to one end of the capacitor C1 and pin 1 of the chip U2, pin 2 of the chip U2 is grounded, the other end of the capacitor C1 is grounded, pin 4 of the chip U2 is grounded, pin 3 of the chip U2 is respectively connected to one end of the capacitor C2 and pin 27 of the chip U1, the other end of the capacitor C2 is grounded, pin 18 of the chip U1 is connected to pin 7 of the chip U3, pin 19 of the chip U1 is connected to pin 3 of the chip U3, pin 20 of the chip U1 is connected to pin 1 of the chip U3, pin 21 of the chip U1 is connected to pin 6 of the chip U3 through the resistor R2, pin 22 of the chip U1 is connected to pin 2 of the chip U3, pin 23 of the chip U1 is connected to pin 5 of the chip U3, and pin 17 of the chip U1 is respectively connected to pin 11 of the chip U1 and the VDD terminal.

[0039] This utility model uses ESP8266 as the main control chip. Additionally, when used as a communication module, the terminal device is connected to the Internet for data transmission through a serial port to WIFI, and the communication mode adopts a basic network topology structure.

[0040] The interface module includes the DALI_RX terminal of the MCU, the DALI_TX terminal of the MCU, the VCC voltage terminal, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the first diode, the second diode, the third diode, the first zener diode, the first triode, the second triode, the third triode, the LM317 chip, the voltage stabilization control chip, the first capacitor, the second capacitor, and the third capacitor. Among them, the VCC voltage terminal is respectively connected to one end of the first capacitor, the Vin terminal of the voltage stabilization control chip, and the negative electrode of the first diode. The positive electrode of the first diode is respectively connected to the V0 terminal of the voltage stabilization control chip, the positive electrode of the first diode, the negative electrode of the second diode, and the DA+ terminal. The other end of the first resistor is respectively connected to one end of the second resistor, the ADJ terminal of the voltage stabilization control chip, the positive electrode of the second diode, and one end of the second capacitor. The other end of the second resistor is respectively connected to the other end of the second capacitor, the other end of the first capacitor, the DA- terminal and grounded. The DA+ terminal is respectively connected to the gate of the third triode, one end of the seventh resistor, and the negative electrode of the zener diode. The positive electrode of the zener diode is respectively connected to one end of the fifth resistor and one end of the sixth resistor. The other end of the fifth resistor is respectively connected to the negative electrode of the third diode, one end of the fourth resistor, and the 5V voltage terminal through the first triode. The positive electrode of the third diode is respectively connected to the DALI_RX terminal of the MCU and one end of the third resistor. The other end of the third resistor is connected to the 3.3V voltage terminal. The gate of the third triode is respectively connected to one end of the tenth resistor and the collector of the second triode through the eleventh resistor. The other end of the tenth resistor is connected to the 5V voltage terminal. The base of the second triode is connected to one end of the eighth resistor and the DALI_TX terminal of the MCU through the ninth resistor. The other end of the eighth resistor is connected to the 3.3V voltage terminal. The other ends of the fourth resistor, the sixth resistor, the seventh resistor, the emitter of the second triode, and the DA- terminal are connected to each other and grounded.

[0041] The interface module uses the voltage stabilization control chip of LM317 to provide the working voltage for the MCU and provide a stable output voltage for the bus interface. During device transmission, it effectively improves the anti-disturbance ability of the interface, can adapt to the level signal range specified by the DALI 2.0 standard, and improves the reliability of the system.

[0042] Those skilled in the art can understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as the general understanding of those of ordinary skill in the field to which this utility model belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with their meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as such here.

[0043] The above embodiments are only used to illustrate the technical idea of this utility model, and the protection scope of this utility model cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by this utility model falls within the protection scope of this utility model. The above has made a detailed description of the implementation manner of this utility model, but this utility model is not limited to the above implementation manner. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can also be made without departing from the purpose of this utility model.

[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of this utility model, rather than to limit it; although this utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A circuit breaker cabinet secondary fault identification instrument, characterized in that: It comprises a box module, in which an interface module, a human-computer interaction module, a wireless transmission module, an indication module, a power module and a control module are arranged, the interface module, the human-computer interaction module, the wireless transmission module, the indication module and the power module are respectively connected to the control module, and the power module is respectively connected to the interface module, the human-computer interaction module, the wireless transmission module, the indication module and the control module to provide required electric energy.

2. A circuit breaker cabinet secondary fault identification instrument according to claim 1, characterized in that: The power supply module includes an EMI filter module, an AC / DC conversion module, a high-frequency transformer, a loop compensation module, a charging control circuit, and a rechargeable battery. The EMI filter module, the AC / DC conversion module, the high-frequency transformer, the loop compensation module, the charging control circuit, and the rechargeable battery are connected in sequence.

3. A circuit breaker cabinet secondary fault identification instrument according to claim 1, characterized in that: The indication module adopts an LED indicator light + an 8-character liquid crystal display screen.

4. A circuit breaker cabinet secondary fault identification instrument according to claim 1, characterized in that: The box body material of the box body module is PVC material, and the panel of the box body module is PVC panel.

5. A circuit breaker cabinet secondary fault identification instrument according to claim 2, characterized in that: The EMI filter module includes a common mode inductor, an X capacitor, a Y capacitor and a bleeder resistor; The common mode inductor is composed of two coils wound in the same direction and is used to eliminate loop differential current; The X capacitor is connected in parallel on both sides of the common mode inductor to eliminate differential mode interference; The Y capacitor is connected across the output end and the midpoint of the series connection is grounded to suppress common mode interference; the discharge resistor is used to eliminate static electricity accumulation in the filter.

6. A circuit breaker cabinet secondary fault identification instrument according to claim 2, characterized in that: The charging control circuit includes a signal control terminal, a charging power terminal, a device power terminal, a battery terminal, a transistor, a first MOS transistor and a second MOS transistor; wherein the charging power terminal is grounded through a first resistor and a second resistor connected in series; the base of the transistor is connected to the signal control terminal and the charging power terminal respectively, the collector of the transistor is connected to the gate of the second MOS transistor through a fourth resistor, and is also connected to the source of the first MOS transistor through a third resistor, and the emitter of the transistor is grounded; the source of the second MOS transistor is connected to the charging power terminal through a first diode, and the drain is connected to the device power terminal; the source of the first MOS transistor is connected to the charging power terminal through a first diode, the gate is connected to the connection point of the first resistor and the second resistor, and the drain is connected to the battery terminal.

7. A circuit breaker cabinet secondary fault identification instrument according to claim 1, characterized in that: The wireless transmission module includes an antenna ANT1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a resistor R1, a resistor R2, an inductor L1, an inductor L2, a chip U1, a chip U2, a chip U3, and a VDD terminal; wherein the antenna ANT1 is respectively connected to one end of the inductor L1 and one end of the capacitor C6, the other end of the inductor L1 is grounded, the other end of the capacitor C6 is respectively connected to one end of the inductor L2 and a pin 2 of the chip U1, the other end of the inductor L2 is grounded, the pin 3 of the chip U1 and the pin 4 of the chip U1 are respectively connected to one end of the capacitor C4, one end of the capacitor C5 and the VDD terminal, the other end of the capacitor C4 and the other end of the capacitor C5 are respectively grounded, the pin 1 of the chip U1 is respectively connected to one end of the capacitor C3, the VDD terminal, the pin 30 of the chip U1 and the pin 29 of the chip U1, the other end of the capacitor C3 is grounded, Pin 31 of chip U1 is connected to one end of resistor R1, and the other end of resistor R1 is grounded, pin 28 of chip U1 is respectively connected to one end of capacitor C1 and pin 1 of chip U2, pin 2 of chip U2 is grounded, the other end of capacitor C1 is grounded, pin 4 of chip U2 is grounded, pin 3 of chip U2 is respectively connected to one end of capacitor C2 and pin 27 of chip U1, and the other end of capacitor C2 is grounded, pin 18 of chip U1 is connected to pin 7 of chip U3, pin 19 of chip U1 is connected to pin 3 of chip U3, pin 20 of chip U1 is connected to pin 1 of chip U3, pin 21 of chip U1 is connected to pin 6 of chip U3 through resistor R2, pin 22 of chip U1 is connected to pin 2 of chip U3, pin 23 of chip U1 is connected to pin 5 of chip U3, and pin 17 of chip U1 is respectively connected to pin 11 of chip U1 and the VDD end.

8. The circuit breaker cabinet secondary fault identification instrument according to claim 1, characterized in that: The interface module includes a DALI_RX terminal of an MCU, a DALI_TX terminal of an MCU, a VCC voltage terminal, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first diode, a second diode, a third diode, a first voltage regulator diode, a first transistor, a second transistor, a third transistor, an LM317 chip, a voltage regulator control chip, a first capacitor, a second capacitor, and a third capacitor; wherein the VCC voltage terminal is respectively connected to one end of the first capacitor, the Vin terminal of the voltage regulator control chip, and the negative electrode of the first diode, the positive electrode of the first diode is respectively connected to the V0 terminal of the voltage regulator control chip, the positive electrode of the first diode, the negative electrode of the second diode, and the DA+ terminal, the other end of the first resistor is respectively connected to one end of the second resistor, the ADJ terminal of the voltage regulator control chip, the positive electrode of the second diode, and one end of the second capacitor, and the other end of the second resistor is respectively connected to the other end of the second capacitor , the other end of the first capacitor, the DA- end and grounded; the DA+ end is respectively connected to the gate of the third triode, one end of the seventh resistor, and the negative electrode of the voltage regulator diode, the positive electrode of the voltage regulator diode is respectively connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is respectively connected to the negative electrode of the third diode, one end of the fourth resistor and the 5V voltage end through the first triode, the positive electrode of the third diode is respectively connected to the DALI_RX end of the MCU and one end of the third resistor, the other end of the third resistor is connected to the 3.3V voltage end, the gate of the third triode is respectively connected to one end of the tenth resistor and the collector of the second triode through the eleventh resistor, the other end of the tenth resistor is connected to the 5V voltage end, the base of the second triode is connected to one end of the eighth resistor and the DALI_TX end of the MCU through the ninth resistor, the other end of the eighth resistor is connected to the 3.3V voltage end, the other end of the fourth resistor, the other end of the sixth resistor, the other end of the seventh resistor, the emitter of the second triode, and the DA- end are mutually connected and grounded.

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