Detection system and power supply branch insulation detection system

Abstract

The utility model provides a detection system and a power supply branch insulation detection system, the detection system comprises a main control unit and N digital Hall ICs, and N is an integer greater than or equal to 2; the digital Hall IC comprises a first wiring terminal and a second wiring terminal, and the main control unit comprises a third wiring terminal; the first wiring terminal of the first digital Hall IC in the N digital Hall ICs is connected with the third wiring terminal of the main control unit, and the second wiring terminals of the first N-1 digital Hall ICs are connected with the first wiring terminals of the digital Hall ICs of the next stage, so that a communication link between the digital Hall ICs and the main control unit is formed. The digital Hall ICs are provided with a plurality of wiring terminals, and all the digital Hall ICs are connected to the main control unit in a cascade connection mode, so that the wiring number of the main control unit side is effectively reduced. And meanwhile, when the digital Hall time IC is added, the digital Hall time IC can be directly connected with the previous-stage digital Hall IC, so that the system maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit monitoring, in particular to a detection system and a power supply branch insulation detection system. BACKGROUND

[0002] In the branch insulation detection of high-voltage direct current systems, the leakage current detection scheme has gradually shifted from the traditional analog Hall to the digital Hall. Compared with the analog Hall scheme, the digital Hall scheme has high integration and strong anti-interference, and has a self-calibration function, which can provide a more reliable and more accurate leakage current detection scheme. In the digital Hall scheme, the Hall communicates with the main monitoring through a digital interface and uploads the leakage current data, and the main monitoring system calculates the branch insulation resistance and further judges whether a branch insulation fault occurs. Usually, a serial communication is used between the digital Hall and the main monitoring.

[0003] Currently, the existing digital Hall provides a serial connection terminal. In a typical high-voltage direct current system, the number of branches is as many as dozens, and the digital Hall on each branch needs to be connected to the main monitoring through a serial cable and communicate with the main monitoring. In this application scenario, dozens of serial cables are collected on the main monitoring side, which has a bloated layout and is inconvenient to maintain and expand. CONTENT OF THE INVENTION

[0004] The present application provides a detection system and a power supply branch insulation detection system to solve the problem of bloated wiring in the prior art.

[0005] In a first aspect, the present application provides a detection system, which comprises a main control unit (100), N digital Hall ICs, N≥2 and N is an integer; the digital Hall IC comprises a first wiring terminal (201) and a second wiring terminal (202), the main control unit (100) comprises a third wiring terminal (101);

[0006] The first wiring terminal (201) of the first digital Hall IC in the N digital Hall ICs is connected with the third wiring terminal (101) of the main control unit (100), and the second wiring terminal (202) of the first N-1 digital Hall ICs is connected with the first wiring terminal (201) of the next level digital Hall IC, thereby forming a communication link between the digital Hall IC and the main control unit (100).

[0007] In one of the embodiments, the digital Hall IC further comprises an output module (203), the first wiring terminal (201) of the digital Hall IC is connected with the second wiring terminal (202), and the output module (203) is connected with the first wiring terminal (201) and the second wiring terminal (202).

[0008] In one of the embodiments, the digital Hall IC comprises a communication module (204), a first end of the communication module (204) is connected with the first wiring terminal (201), and a second end of the communication module (204) is connected with the second wiring terminal (202).

[0009] In one of the embodiments, the digital Hall IC communicates with the master control unit (100) through a serial communication mode, and the serial communication mode is an RS485 communication mode.

[0010] In one of the embodiments, the second wiring terminal (202) of the Nth digital Hall IC in the N digital Hall ICs is connected with a terminal resistance (R).

[0011] In one of the embodiments, the digital Hall IC further comprises a shell (205), and the second wiring terminal (202) and the first wiring terminal (201) are arranged on the same side of the shell (205).

[0012] In one of the embodiments, the digital Hall IC further comprises a shell (205), and the second wiring terminal (202) and the first wiring terminal (201) are arranged on different sides of the shell (205).

[0013] In a second aspect, the embodiments of the present application provide a power branch insulation detection system, which comprises a multi-branch power supply (2) and a detection system (1); the detection system (1) comprises a master control unit (100) and N digital Hall ICs, N≥2 and N is an integer; the digital Hall IC comprises a first wiring terminal (201) and a second wiring terminal (202), and the master control unit (100) comprises a third wiring terminal (101).

[0014] The N digital Hall ICs are respectively installed on N branches of the multi-branch power supply (2), and the digital Hall IC is used for detecting a leakage current on the branch of the multi-branch power supply (2).

[0015] The first wiring terminal (201) of the first digital Hall IC in the N digital Hall ICs is connected with the third wiring terminal (101) of the master control unit (100), the second wiring terminal (202) of the first N-1 digital Hall ICs is connected with the first wiring terminal (201) of the next level digital Hall IC, and a communication link between the digital Hall IC and the master control unit (100) is formed.

[0016] In one of the embodiments, the multi-branch power supply (2) is a high-voltage direct-current power supply.

[0017] This application provides a detection system and a power branch insulation detection system. The detection system includes a main control unit and N digital Hall effect ICs, where N ≥ 2 and N is an integer. Each digital Hall effect IC includes a first terminal and a second terminal, and the main control unit includes a third terminal. The first terminal of the first digital Hall effect IC among the N digital Hall effect ICs is connected to the third terminal of the main control unit, and the second terminals of the preceding N-1 digital Hall effect ICs are connected to the first terminal of the next-level digital Hall effect IC, forming a communication link between the digital Hall effect ICs and the main control unit. By setting multiple terminals on the digital Hall effect ICs and connecting all digital Hall effect ICs to the main control unit in a cascade manner, the number of wires on the main control unit side is effectively reduced. Furthermore, when adding a digital Hall effect IC, it can be directly connected to the previous-level digital Hall effect IC, facilitating system maintenance. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] Figure 1 This is a basic schematic diagram of DC leakage current monitoring provided in one embodiment;

[0020] Figure 2 This is a block diagram of a high-voltage DC system branch insulation detection system provided in one embodiment;

[0021] Figure 3 A schematic diagram of the detection system provided in one embodiment. Figure 1 ;

[0022] Figure 4 A schematic diagram of the structure of a digital Hall IC provided in one embodiment. Figure 1 ;

[0023] Figure 5 This is a schematic diagram showing the connection of N digital Hall ICs provided in one embodiment;

[0024] Figure 6 A schematic diagram of the detection system provided in one embodiment. Figure 2 ;

[0025] Figure 7 A schematic diagram of the structure of a digital Hall IC provided in one embodiment. Figure 2 ;

[0026] Figure 8 A schematic diagram of the structure of a digital Hall IC provided in one embodiment. Figure 3 ;

[0027] Figure 9A structure diagram of a power branch insulation detection system provided in an embodiment.

[0028] Explanation of reference signs:

[0029] 1-detection system; 2-multi-branch power supply; 100-master control unit; 101-third terminal; 201-first terminal; 202-second terminal; 203-output module; 204-communication module; 205-housing; 300-communication link; R-terminal resistor.

[0030] The specific embodiments of the present application have been shown and described in the above-described drawings, and will be described in more detail hereinafter. These drawings and the written description are not to be construed as limiting the scope of the present application in any way, but are merely to illustrate the concept of the present application to one of ordinary skill in the art by reference to a particular embodiment. DETAILED DESCRIPTION

[0031] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals refer to like elements, and the term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Unless specifically stated otherwise, the exemplary embodiments are not intended to represent one of the only embodiments consistent with the present application. Rather, the exemplary embodiments are merely examples of apparatus and methods consistent with the present application that are intended to provide those skilled in the art with an understanding of the basic underlying concepts of the present application.

[0032] In the description of the present application, the terms "first", "second", etc. are used only for the purpose of description, and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Thus, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the term "a plurality of" means two or more, unless otherwise explicitly specified and limited.

[0033] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the traditional power system secondary circuit, generally uses 200V / 110V DC power supply system as the power supply circuit, in order to ensure the high reliability of the secondary circuit power supply, avoid because of single end insulation decline and lead to another end ground caused by DC bus short circuit fault occurs, also in order to avoid because of single end insulation decline and grounding, the other end to ground forms an effective high DC voltage and electric shock, the positive and negative bus of DC power supply system ground insulation monitoring becomes very important. With the explosive growth of power system and the wide application of HVDC power supply system in various power systems, from the perspective of maintaining the safety of power supply system and the safety of use and maintenance, the positive and negative bus insulation detection of HVDC power supply system is also very important.

[0035] In the common DC power supply system, generally AC power supply is converted into DC power supply output through rectifier. In order to ensure the safety of DC power supply system, avoid forming reference voltage to ground, generally DC power supply system will be designed as positive and negative bus floating to ground, which is different from the zero line grounding of some AC power supply system and-48 / 24V DC communication power supply system. The insulation detection of DC power supply system includes the insulation monitoring of DC bus and the insulation monitoring of each load branch.

[0036] The basic principle of bus insulation monitoring is to measure the insulation resistance between the positive and negative poles of the bus. The resistance of the charged body cannot be directly measured, so the sampling resistance is usually inserted between the positive and negative buses. Different sampling resistances and insulation resistances form different DC voltages to ground. By detecting the positive and negative bus voltages in different states, the ground insulation resistance of the bus is indirectly calculated. The insulation monitoring of DC branch generally monitors the leakage current of the branch output of the power supply system, and judges the size of the corresponding insulation resistance according to the size of the leakage current to give the alarm of branch insulation fault.

[0037] Among them, the branch insulation monitoring generally uses DC leakage current sensor for monitoring, such as through Hall sensor, general amplifier and other semiconductor technology for monitoring. The basic principle of DC leakage current monitoring is as shown in Figure 1 The positive and negative cables pass through the leakage current sensor at the same time. In the case of no insulation decline, the DC currents passing through the positive and negative cables are equal in size and opposite in direction, so there will be no induction signal on the DC transformer. When one of the poles has insulation decline, the current passing through the positive and negative poles will not be equal, which is the signal of the transformer induction of the current difference. Compared with the leakage current calculated by the correction resistance controlled by two 30kΩ resistors K1 and K2, when the alarm threshold is exceeded, the branch alarm is given.

[0038] In the high voltage direct current system branch insulation detection, the leakage current detection scheme has gradually started to shift from the traditional analog Hall to the digital Hall. Compared with the analog Hall scheme, the digital Hall scheme has high integration, strong anti-interference ability, and self-calibration function, and can provide a more reliable and more accurate leakage current detection scheme. As shown in Figure 2 , the digital Hall IC communicates with the main monitoring through a digital interface and sends the leakage current data, and the main monitoring as the master control unit calculates the branch insulation resistance and further judges whether the branch insulation fault occurs. Usually, the serial communication is used between the digital Hall IC and the master control unit.

[0039] Currently, the mainstream digital Hall IC provides a serial connection terminal. In a typical high voltage direct current system, the number of branches is dozens, and the digital Hall IC on each branch needs to be connected to the master control unit through a serial cable and communicate with the master control unit. In this application scenario, dozens of serial cables are gathered on the master control unit side, the layout is bloated, and it is not convenient to maintain and expand.

[0040] In view of the above technical problems, the embodiment of the present application provides a detection system, as shown in Figure 3 , the detection system 1 includes a master control unit 100, N digital Hall ICs (Hall1~ Hall N), N≥2 and N is an integer; the digital Hall IC includes a first wiring terminal 201 and a second wiring terminal 202, and the master control unit 100 includes a third wiring terminal 101;

[0041] The first wiring terminal 201 of the first digital Hall IC (Hall1) in the N digital Hall ICs (Hall1~ Hall N) is connected with the third wiring terminal 101 of the master control unit 100, and the second wiring terminal 202 of the digital Hall IC (Hall1~ Hall N-1) is connected with the first wiring terminal 201 of the next level digital Hall IC, to form a communication link between the N digital Hall ICs (Hall1~ Hall N) and the master control unit 100.

[0042] Among them, the structure of the digital Hall IC includes a Hall element and a circuit part, when the current passes through the Hall element, if there is an external magnetic field perpendicular to the current direction, a potential difference will be generated on both sides of the Hall element. The Hall voltage generated by the Hall element is processed by the circuit part, and then the data is sent to the master control unit 100 through the communication link formed between the master control unit 100. Therefore, the digital Hall IC provides a wiring terminal connected with the master control unit 100 to build a communication link.

[0043] In the embodiment of the present application, the digital Hall IC includes at least two terminals, in the case that the monitoring system includes a plurality of digital Hall ICs, the first terminal 201 of each digital Hall IC is connected with the second terminal 202 of the upper-level digital Hall IC, and the second terminal is connected with the first terminal 201 of the lower-level digital Hall IC, forming a cascaded structure. As for the digital Hall IC (Hall 1), the first terminal 201 is connected with the third terminal 101 of the master control unit 100, thereby constructing the communication link between the N digital Hall ICs and the master control unit 100.

[0044] Therefore, only the first terminal of the digital Hall IC (Hall 1) needs to be connected with the terminal of the master control unit 100, and then the communication with all the digital Hall ICs is completed through Hall 1~ Hall N in sequence.

[0045] In the case that the monitoring system (1) further includes other digital Hall ICs, the other digital Hall ICs can be connected with the master control unit 100 in the cascaded manner as in the above embodiment, or each of the other digital Hall ICs can be directly connected with the master control unit 100, or a part of the other digital Hall ICs are connected with the master control unit 100 in the cascaded manner and a part of the other digital Hall ICs are directly connected with the master control unit 100. Regardless of the connection manner, at least two digital Hall ICs among all the digital Hall ICs connected with the master control unit 100 are connected with the master control unit 100 in the cascaded manner, which can effectively reduce the number of terminals on the side of the master control unit 100.

[0046] It should be noted that, in the above structure, if a plurality of digital Hall ICs need to be connected with the master control unit 100 in the cascaded manner, all the digital Hall ICs in the cascade need to have two terminals, i.e., the first terminal and the second terminal, thereby realizing the cascade.

[0047] In one embodiment, all the digital Hall ICs in the monitoring system (1) have two terminals, and all the digital Hall ICs are connected with the master control unit 100 in the cascaded manner, so that only one cable needs to be connected on the side of the third terminal of the master control unit 100.

[0048] The detection system provided by the above embodiment comprises a master control unit, N digital Hall ICs, N≥2 and N is an integer; the digital Hall IC comprises a first connecting terminal and a second connecting terminal, the master control unit comprises a third connecting terminal; the first connecting terminal of a first digital Hall IC among the N digital Hall ICs is connected with the third connecting terminal of the master control unit, the second connecting terminal of a previous N-1 digital Hall IC is connected with the first connecting terminal of a next digital Hall IC, thereby forming a communication link between the digital Hall IC and the master control unit. By arranging a plurality of connecting terminals on the digital Hall IC, all the digital Hall ICs are connected to the master control unit in a cascading manner, thereby effectively reducing the number of wirings on the master control unit side. Meanwhile, when a digital Hall IC is added, it can be directly connected with a previous digital Hall IC, thereby facilitating system maintenance.

[0049] In one embodiment, as shown in Figure 4 The digital Hall IC further comprises an output module 203, the first connecting terminal 201 of the digital Hall IC is connected with the second connecting terminal 202, and the output module 203 is connected with the first connecting terminal 201 and the second connecting terminal 202.

[0050] The output module 203 is used for outputting detection data in the digital Hall IC. The first connecting terminal 201 of the digital Hall IC is connected with the second connecting terminal 202 inside the structure of the digital Hall IC, so that after the first connecting terminal 201 of one digital Hall IC is connected with the second connecting terminal 202 of a current digital Hall IC, the communication link between the digital Hall IC and the master control unit 100 is accessed to realize communication. At this time, one-to-one communication is realized between the latter- accessed digital Hall IC and the master control unit 100, and the communication data is not passed through other digital Hall ICs. The data of the digital Hall IC is transmitted to the master control unit 100 through the output module 203, the first connecting terminal 201 or the second connecting terminal 202.

[0051] That is, by arranging the first connecting terminal 201 and the second connecting terminal 202 on the digital Hall IC, the first connecting terminal 201 and the second connecting terminal 202 are connected inside the digital Hall IC, and outside, the digital Hall IC is cascaded through the first connecting terminal 201 and the second connecting terminal 202, so as to connect all the digital Hall ICs to the bus of the communication link. As shown in Figure 5 All the N digital Hall ICs are connected to the communication link 300.

[0052] It can be seen that the second connecting terminal 202 is designed for the next digital Hall IC to be directly connected to the communication link 300 without being connected to the third connecting terminal 101 of the master control unit 100.

[0053] The detection system provided in the above embodiment realizes one-to-many communication between the master control unit and the digital Hall IC by changing the structure and connection mode of the digital Hall IC, and reduces the wiring.

[0054] In one of the embodiments, the digital Hall IC and the master control unit 100 communicate through a serial communication mode, which is an RS485 communication mode.

[0055] The RS485 communication mode adopts a differential signal transmission mode, that is, two signal lines A line and B line are used to transmit data. When the A line is at a high level, the B line is at a low level, and vice versa. In the embodiment of the application, a two-wire connection mode is adopted to realize one-to-many communication between the master control unit 100 and N digital Hall ICs.

[0056] In the RS485 communication mode, if the impedance is discontinuous or mismatched, signal reflection will occur, causing unstable communication. Therefore, when the RS485 communication mode is adopted, a terminal resistor R (generally 120Ω) with the same size as the cable characteristic impedance is connected across the two ends of the transmission line, so that the impedance of the cable is continuous, as shown in Figure 6 .

[0057] In one of the embodiments, as shown in Figure 7 , the digital Hall IC includes a communication module 204, the first end of the communication module 204 is connected with the first wiring terminal 201, and the second end of the communication module 204 is connected with the second wiring terminal 202.

[0058] The communication module 204 is used to receive the signal input by the first wiring terminal 201, and then determine whether to send the signal to the next level of digital Hall IC after processing and analyzing the signal. Compared with the above scheme in which the output module 203 is connected with the first wiring terminal 201 and the second wiring terminal 202, the communication between the master control unit 100 and the N digital Hall ICs in this embodiment is not a bus broadcast type, but a level-by-level transmission.

[0059] In one of the embodiments, as shown in Figure 8 , the digital Hall IC further includes a shell 205, and the second wiring terminal 202 and the first wiring terminal 201 can be arranged on the same side of the shell 205, or can be arranged on different sides of the shell 205.

[0060] The shell 205 refers to a packaging structure of the digital Hall IC. The shell 205 can be of any shape and any size. The first connecting terminal 201 and the second connecting terminal 202 are arranged on the shell 205 and used to be connected with other devices. One side of the shell 205 refers to one side of the shell 205. The second connecting terminal 202 and the first connecting terminal 201 can be arranged on the same side of the shell 205, and the second connecting terminal 202 and the first connecting terminal 201 can be at any position on the same side, adjacent or not adjacent. Similarly, when the second connecting terminal 202 and the first connecting terminal 201 are arranged on different sides of the shell 205, the positions of the second connecting terminal 202 and the first connecting terminal 201 can be symmetrical or not symmetrical. The present application does not limit the positions of the first connecting terminal 201 and the second connecting terminal 202 on the shell 205. It can be understood that, as long as the digital Hall IC is connected according to the connection mode in the present application, the scheme including two connecting terminals belongs to the protection scope of the present application.

[0061] Based on the detection system provided in the above embodiments, as shown in Figure 9 The present application also provides a power branch insulation detection system. The power branch insulation detection system includes a multi-branch power supply 2 and a detection system 1. The detection system 1 includes a master control unit 100, N digital Hall ICs (Hall1~Hall N), N≥2 and N is an integer. The digital Hall IC includes a first connecting terminal 201 and a second connecting terminal 202. The master control unit includes a third connecting terminal 101.

[0062] The N digital Hall ICs (Hall1~Hall N) are respectively installed on the N branches of the multi-branch power supply 2. The digital Hall IC is used to detect the leakage current on the branch of the multi-branch power supply 2.

[0063] The first connecting terminal 201 of the first digital Hall IC (Hall1) in the N digital Hall ICs (Hall1~Hall N) is connected with the third connecting terminal 101 of the master control unit 100. The second connecting terminal 202 of the first N-1 digital Hall ICs (Hall1~Hall N-1) is connected with the first connecting terminal 201 of the next level digital Hall IC, thereby forming a communication link between the digital Hall IC and the master control unit 100.

[0064] The insulation detection of the multi-branch power supply 2 is completed through the plurality of digital Hall ICs and the master control unit. The digital Hall IC is installed on each branch of the multi-branch power supply 2, collects the leakage current of each branch, sends the collected leakage current to the master control unit, and the master control unit judges whether it is abnormal and issues a warning. The multi-branch power supply 2 can be a high-voltage direct-current power supply. The branch insulation of the high-voltage direct-current power supply is detected by the detection system 1.

[0065] In the high-voltage direct-current power supply system, a plurality of digital Hall ICs with two terminals are used to detect the leakage current of direct current, the plurality of digital Hall ICs are connected with the master control unit through the cascade mode, communicate with the master control unit, and send the leakage current data to the master control unit. Through the cascade mode, the number of wiring on the master control unit side can be effectively reduced, the wiring is simplified, and when the digital Hall IC is increased, the number of Hall can be expanded by directly connecting with the last digital Hall IC.

[0066] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0067] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is indicated only by the appended claims.

Claims

1. A detection system, characterized in that, The detection system (1) comprises a master control unit (100), N digital Hall ICs, N>=2 and N is an integer; the digital Hall IC comprises a first terminal (201) and a second terminal (202), the master control unit (100) comprises a third terminal (101); The first terminal (201) of the first digital Hall IC in the N digital Hall ICs is connected with the third terminal (101) of the master control unit (100), the second terminal (202) of the first N-1 digital Hall ICs is connected with the first terminal (201) of the next level digital Hall IC, and a communication link between the digital Hall IC and the master control unit (100) is formed.

2. The detection system of claim 1, wherein, The digital Hall IC further comprises an output module (203), the first terminal (201) of the digital Hall IC is connected with the second terminal (202), and the output module (203) is connected with the first terminal (201) and the second terminal (202).

3. The detection system of claim 1, wherein, The digital Hall IC comprises a communication module (204), a first end of the communication module (204) is connected with the first terminal (201), and a second end of the communication module (204) is connected with the second terminal (202).

4. The detection system of claim 1, wherein, The digital Hall IC and the master control unit (100) communicate through a serial communication mode, and the serial communication mode is an RS485 communication mode.

5. The detection system of claim 4, wherein, The second terminal (202) of the Nth digital Hall IC in the N digital Hall ICs is connected with a terminal resistance (R).

6. The detection system according to any one of claims 1 to 5, characterized in that The digital Hall IC further comprises a shell (205), and the first terminal (201) and the second terminal (202) are arranged on the same side of the shell (205).

7. The detection system according to any one of claims 1 to 5, characterized in that The digital Hall IC further comprises a shell (205), and the first terminal (201) and the second terminal (202) are arranged on different sides of the shell (205).

8. A power branch insulation detection system characterized by, The power branch insulation detection system comprises a multi-branch power supply (2) and a detection system (1); the detection system (1) comprises a master control unit (100) and N digital Hall ICs, N>=2 and N is an integer; the digital Hall IC comprises a first terminal (201) and a second terminal (202), and the master control unit (100) comprises a third terminal (101); The N digital Hall ICs are respectively installed on N branches of the multi-branch power supply (2), and the digital Hall IC is used for detecting a leakage current on the branch of the multi-branch power supply (2); The first terminal (201) of the first digital Hall IC in the N digital Hall ICs is connected with the third terminal (101) of the master control unit (100), the second terminal (202) of the first N-1 digital Hall ICs is connected with the first terminal (201) of the next level digital Hall IC, and a communication link between the digital Hall IC and the master control unit (100) is formed.

9. The power leg insulation detection system of claim 8, wherein, The multi-branch power supply (2) is a high-voltage direct-current power supply.

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