Multistage electric leakage switch override trip diagnosis device

Abstract

The utility model relates to the technical field of electric leakage switch protection equipment, in particular to a multistage electric leakage switch override trip diagnosis device, which comprises a shell, and the shell is provided with a power interface, a test interface and a display screen. The test interface is used for accessing a diagnosis line; the rectifying and voltage-stabilizing circuit is electrically connected with the power interface and is used for providing stable voltage for the leakage current selection circuit; the leakage current selection circuit is electrically connected with the test interface and is used for selecting different leakage current diagnosis lines according to the electric leakage switch; the control module is electrically connected with the leakage current selection circuit and the display screen. When the field voltage floats, the rectifying and voltage stabilizing circuit can provide stable base voltage for the triode VT4, so that the use of the triode VT4 is ensured; stable working voltage can be provided for the control module, and then the stable working state of the control module and all electronic components is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of leakage protection device, in particular to a multi-stage leakage protection device. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] In the operation process of the three-stage leakage protection of the low-voltage distribution area, sometimes the leakage protection switch is not from the same manufacturer, or the leakage action parameter of the intermediate stage leakage protection switch is not properly set, which causes the leakage tripping fault. Such faults generally occur accidentally, because the leakage reaches a certain critical value to cause a sudden fault, which is not easy to troubleshoot; after the leakage tripping power supply, it is difficult to reproduce the fault within a certain time, so it is not easy to locate which stage and which leakage protection switch causes it. At the same time, it is found in work that the voltage value is not stable in different occasions, some of which are high and some of which are low, and some electronic components such as MCUs in the leakage detection device need stable power supply to operate, and the base of some transistors needs stable voltage to maintain the stable working state of the transistor; the instability of the voltage causes difficulties in detecting the leakage switch on site.

[0004] In order to solve the above problems, it is necessary to develop a multi-stage leakage protection device. The use of this device can quickly reproduce the fault phenomenon and locate the leakage protection switch for timely fault handling; and can provide stable voltage to improve the fault troubleshooting work efficiency and low-voltage power supply reliability. SUMMARY

[0005] Therefore, in order to solve the above technical problems, the present application provides a multi-stage leakage protection device.

[0006] The technical scheme adopted by the present application to solve the problems existing in the prior art is:

[0007] The present application provides a multi-stage leakage protection device, which comprises:

[0008] The shell is provided with a power supply interface, a test interface and a display screen; the power supply interface is used for connecting an external power supply; and the test interface is used for connecting a diagnostic circuit;

[0009] The rectifier voltage stabilizing circuit is electrically connected with the power supply interface and is used for providing stable voltage for the leakage current selection circuit;

[0010] The leakage current selection circuit is electrically connected with the test interface and is used for selecting different leakage current diagnostic circuits according to the leakage switch;

[0011] The control module is electrically connected with the leakage current selection circuit and the display screen.

[0012] Preferably,

[0013] The test interface comprises a phase line access end and a zero line access end.

[0014] The leakage current selection circuit comprises a transistor VT4 and a switch selection circuit.

[0015] The base of the transistor VT4 is connected with the output end of the rectification and voltage stabilization circuit, the collector of the transistor VT4 is electrically connected with one end of the switch selection circuit, and the emitter of the transistor VT4 is connected with the phase line access end of the test interface.

[0016] The switch selection circuit comprises a first switch S 00 , a second switch S 01 , a third switch S 02 , a fourth switch S 03 and a fifth switch S 04 , all of which are connected with the collector of the transistor VT4; the other ends of the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 and the fifth switch S 04 are respectively connected with one end of a first resistor R 00 , a second resistor R 01 , a third resistor R 02 , a fourth resistor R 03 and a fifth resistor R 04 ; the other ends of the first resistor R 00 , the second resistor R 01 , the third resistor R 02 , the fourth resistor R 03 and the fifth resistor R 04 are all connected with the zero line access end of the test interface.

[0017] Preferably,

[0018] The rectification and voltage stabilization circuit comprises an AC voltage reduction unit, a bridge rectification unit, a filter unit and a voltage stabilization unit in sequence.

[0019] The voltage stabilization unit comprises a reference voltage circuit, a sampling circuit, a comparison and amplification circuit and an adjustment circuit; the comparison and amplification circuit amplifies the voltage difference provided by the sampling circuit and the reference voltage circuit and then controls the adjustment circuit to stabilize the output voltage.

[0020] Preferably,

[0021] The AC voltage reduction unit comprises a transformer T, one side of the transformer T is electrically connected with two ends of the power supply interface, and the other side of the transformer T is electrically connected with the bridge rectifier unit;

[0022] The bridge rectifier unit is composed of four diodes VD1, VD2, VD3 and VD4;

[0023] The filter unit is a capacitor C1, two ends of the capacitor C1 are connected with two ends of the bridge rectifier unit respectively;

[0024] The voltage stabilizing unit comprises a resistor R1, a regulating tube VT1, an amplifying tube VT3, a voltage stabilizing tube VD5, a resistor R5, a resistor R6, a resistor R7 and a capacitor C2;

[0025] Wherein:

[0026] One end of the resistor R1 is connected with one end of the capacitor C1 and the collector of the regulating tube VT1, and the other end of the resistor R1 is connected with the base of the regulating tube VT1 and the collector of the amplifying tube VT3;

[0027] The emitter of the regulating tube VT1 is connected with one end of the resistor R5, one end of the resistor R6 and one end of the capacitor C2;

[0028] The emitter of the amplifying tube VT3 is connected with the cathode of the voltage stabilizing tube VD5 and the other end of the resistor R5;

[0029] The base of the amplifying tube VT3 is connected with the other end of the resistor R6 and one end of the resistor R7;

[0030] The other end of the resistor R7 and the anode of the voltage stabilizing tube VD5 are both connected with the other end of the capacitor C1 and then connected with the ground terminal GND;

[0031] One end of the capacitor C2, which is different from the end connected with the ground terminal GND, is connected with the base of the triode VT4.

[0032] Preferably,

[0033] The rectifying and voltage stabilizing circuit is provided with a switch SK between the switch selection circuit.

[0034] Preferably,

[0035] The voltage stabilizing unit further comprises a protection circuit;

[0036] The protection circuit comprises a triode VT2, the collector of the triode VT2 is connected with the collector of the amplifying tube VT3, the base of the triode VT2 is connected with one end of a resistor R2 and one end of a resistor R3; one end of the capacitor C2, which is different from the end connected with the ground terminal GND, is connected with the emitter of the triode VT2, and the emitter of the triode VT2 is connected in series with the emitter of the regulating tube VT1 through a resistor R4;

[0037] The other end of the resistor R2 is connected with the emitter of the adjusting tube VT1.

[0038] One end of the resistor R3 is connected with the ground terminal GND.

[0039] Preferably,

[0040] The display screen is a touch screen, and the display screen is configured with a first switch S 00 , a second switch S 01 , a third switch S 02 , a fourth switch S 03 , a fifth switch S 04 , and a switch SK. By manually clicking the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 , the fifth switch S 04 , and the switch SK on the display screen, the opening and closing of each switch can be realized.

[0041] Preferably,

[0042] The housing is also provided with manual switches S0, S1, S2, S3, and S4, respectively, for controlling the opening and closing of the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 , and the fifth switch S 04 in the switch selection circuit.

[0043] Compared with the prior art, the application has the following beneficial effects:

[0044] 1. The design of the rectifier voltage stabilizing circuit can effectively ensure the voltage stabilizing effect through the adjusting tube, can provide a stable base voltage for the triode VT4 when the field voltage is floating, can ensure the use of the triode VT4, and can provide a stable working voltage for the control module, thereby ensuring the stable working state of the control module and each electronic component.

[0045] 2. The operation process is simple, safe, and convenient to use.

[0046] 3. By selecting one of the first switch S00, the second switch S01, the third switch S02, the fourth switch S03, or the fifth switch S04 to be closed, the leakage current in the injection circuit can be controlled, that is, different multiple leakage currents can be selected to test the circuit, thereby meeting the diagnosis requirements of different levels of leakage switches. BRIEF DESCRIPTION OF DRAWINGS

[0047] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The embodiments of the application, and their

[0048] Figure 1 An electrical schematic diagram of a multi-stage leakage circuit breaker over-trip diagnostic device of the present application,

[0049] Figure 2 An electrical schematic diagram of a multi-stage leakage circuit breaker over-trip diagnostic device of the present application, Figure 1 An electrical schematic diagram of a multi-stage leakage circuit breaker over-trip diagnostic device of the present application,

[0050] Figure 3 An electrical schematic diagram of a multi-stage leakage circuit breaker over-trip diagnostic device of the present application,

[0051] Figure 4 An electrical schematic diagram of a multi-stage leakage circuit breaker over-trip diagnostic device of the present application,

[0052] In the drawings:

[0053] 1, housing, 2, power interface, 3, test interface, 4, display screen. DETAILED DESCRIPTION

[0054] The application will be further described below in conjunction with the drawings and embodiments.

[0055] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0056] In the present disclosure, the terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the convenience of describing the structural relationship of the components or elements of the present disclosure, and cannot be understood as a limitation on the present disclosure.

[0057] Figure 4 An electrical schematic diagram of a multi-stage leakage circuit breaker over-trip diagnostic device of the present application, Figure 1 An electrical schematic diagram of a multi-stage leakage circuit breaker over-trip diagnostic device of the present application,

[0058] The housing 1 is provided with a power interface 2, a test interface 3 and a display screen 4; the power interface 2 is used for connecting external power supply; the test interface 3 is used for connecting diagnostic circuit;

[0059] The rectifier voltage stabilizing circuit is electrically connected with the power interface 2, and is used for providing stable voltage for the leakage current selection circuit;

[0060] The leakage current selection circuit is electrically connected with the test interface 3, and is used for selecting different leakage current diagnostic circuits according to the leakage switch;

[0061] The control module is electrically connected with the leakage current selection circuit and the display screen 4.

[0062] The test interface 3 comprises a phase line access end and a zero line access end; and with reference to Figure 4 , the test interface 3 is provided in multiple groups, and all groups except one are used as backup.

[0063] With reference to Figure 3 , the leakage current selection circuit comprises a triode VT4 and a switch selection circuit; the base of the triode VT4 is connected with the output end of the rectifier voltage stabilizing circuit, the collector of the triode VT4 is electrically connected with one end of the switch selection circuit, and the emitter of the triode VT4 is connected with the phase line access end of the test interface 3; the switch selection circuit comprises a first switch S 00 , a second switch S 01 , a third switch S 02 , a fourth switch S 03 and a fifth switch S 04 , all of which are connected with the collector of the triode VT4; the other ends of the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 and the fifth switch S 04 are respectively connected with one end of a first resistor R 00 , a second resistor R 01 , a third resistor R 02 , a fourth resistor R 03 and a fifth resistor R 04 ; the other ends of the first resistor R 00 , the second resistor R 01 , the third resistor R 02 , the fourth resistor R 03 and the fifth resistor R 04 are all connected with the zero line access end of the test interface 3.

[0064] With reference to Figure 1 , the rectifier voltage stabilizing circuit comprises an AC voltage reduction unit, a bridge rectifier unit, a filter unit and a voltage stabilizing unit in sequence; with reference to Figure 2The voltage stabilizing unit comprises a reference voltage circuit, a sampling circuit, a comparison amplification circuit and an adjusting circuit; the comparison amplification circuit amplifies the voltage difference provided by the sampling circuit and the reference voltage circuit and then controls the adjusting circuit to stabilize the output voltage.

[0065] With reference to Figure 3 The AC voltage reduction unit comprises a transformer T, one side of the transformer T being electrically connected to both ends of the power supply interface 2, and the other side of the transformer T being electrically connected to the bridge rectifier unit;

[0066] The bridge rectifier unit is composed of four diodes VD1, VD2, VD3 and VD4;

[0067] The filter unit is a capacitor C1, two ends of the capacitor C1 being respectively connected to both ends of the bridge rectifier unit;

[0068] The voltage stabilizing unit comprises a resistor R1, an adjusting tube VT1, an amplifying tube VT3, a voltage stabilizing tube VD5, a resistor R5, a resistor R6, a resistor R7 and a capacitor C2;

[0069] Wherein:

[0070] One end of the resistor R1 is connected to one end of the capacitor C1 and the collector of the adjusting tube VT1, and the other end of the resistor R1 is connected to the base of the adjusting tube VT1 and the collector of the amplifying tube VT3;

[0071] The emitter of the adjusting tube VT1 is connected to one end of the resistor R5, one end of the resistor R6 and one end of the capacitor C2;

[0072] The emitter of the amplifying tube VT3 is connected to the cathode of the voltage stabilizing tube VD5 and the other end of the resistor R5;

[0073] The base of the amplifying tube VT3 is connected to the other end of the resistor R6 and one end of the resistor R7;

[0074] The other end of the resistor R7 and the anode of the voltage stabilizing tube VD5 are both connected to the other end of the capacitor C1 and then connected to the ground terminal GND;

[0075] One end of the capacitor C2, which is different from the end connected to the ground terminal GND, is connected to the base of the triode VT4.

[0076] In some embodiments, a switch SK is arranged between the rectifying and voltage stabilizing circuit and the switch selection circuit.

[0077] In some embodiments, the voltage stabilizing unit further comprises a protection circuit; with reference to Figure 3The protection circuit comprises a transistor VT2, the collector of the transistor VT2 is connected with the collector of an amplifier VT3, the base of the transistor VT2 is connected with one end of a resistor R2 and one end of a resistor R3; the emitter of the transistor VT2 is connected with one end of a capacitor C2 which is connected with a ground terminal GND, and the emitter of the transistor VT2 is connected with the emitter of a regulating tube VT1 in series with a resistor R4; the other end of the resistor R2 is connected with the emitter of the regulating tube VT1; one end of the resistor R3 is connected with the ground terminal GND.

[0078] In some embodiments, the display screen 4 is a touch screen, and the display screen 4 is configured with a first switch S 00 , a second switch S 01 , a third switch S 02 , a fourth switch S 03 , a fifth switch S 04 , and a switch SK; the opening and closing of the switches can be realized by manually clicking the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 , the fifth switch S 04 , and the switch SK on the display screen 4.

[0079] In some embodiments, the housing 1 is further provided with manual switches S0, S1, S2, S3, and S4, which are respectively used for controlling the opening and closing of the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 , and the fifth switch S 04 in the switch selection circuit.

[0080] In some embodiments, the opening and closing of the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 , and the fifth switch S 04 are realized by driving several relays by a control module, and the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 , and the fifth switch S 04 are electrically connected with the control module.

[0081] The control module can be an MCU.

[0082] Working principle:

[0083] Reference Figure 4The test interface 3 has a phase line access end and a zero line access end. When the leakage switch to be tested is selected, a single-phase live wire on the outgoing side of the leakage switch is connected to the phase line access end of the test interface 3, and the zero line on the incoming side of the leakage switch is connected to the zero line access end of the test interface 3. At this time, it is necessary to ensure that the leakage switch is in a normal operating state, i.e., the load is connected to provide power to the load.

[0084] Then, according to the type of the leakage switch, i.e., according to the leakage current of the leakage switch, reference Figure 3 is selected to close one of the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 or the fifth switch S 04 . According to the different resistance values of the first resistor R 00 , the second resistor R 01 , the third resistor R 02 , the fourth resistor R 03 and the fifth resistor R 04 , different current values can be injected into the circuit by closing different first switches S 00 , second switches S 01 , third switches S 02 , fourth switches S 03 or fifth switches S 04 .

[0085] It should be noted that closing the first switch S 00 , the second switch S 01 , the third switch S 02 , the fourth switch S 03 or the fifth switch S 04 is determined according to the type of the leakage switch and the resistance values of the first resistor R 00 , the second resistor R 01 , the third resistor R 02 , the fourth resistor R 03 and the fifth resistor R 04 . This is a common technical means for those skilled in the art, and will not be described again.

[0086] If the leakage switch operates, it is determined that the leakage switch has a problem.

[0087] If the leakage switch does not operate, the next leakage switch can be tested.

[0088] This application discloses a multi-stage leakage current switch over-trip diagnostic device. The voltage stabilization circuit design, through the adjustment tube, can effectively ensure voltage stabilization. When the field voltage fluctuates, it can provide a stable base voltage for the transistor VT4, ensuring the operation of the transistor VT4. By selecting to close one of the first switch S00, the second switch S01, the third switch S02, the fourth switch S03, or the fifth switch S04, the leakage current injected into the circuit can be controlled. That is, different leakage currents can be selected to test the circuit, meeting the diagnostic needs of different stages of leakage current switches.

[0089] It should be noted that the multi-stage leakage current switch over-trip diagnostic device of this application uses transistor VT4 to control the on / off state of the leakage current selection circuit. This is because the leakage current switch diagnostic is performed when the leakage current switch is normally energized. (Refer to...) Figure 3 When TEST L is connected to a phase wire on the output side of the residual current circuit breaker, TEST L will be connected to the power supply; similarly, when TEST N is connected to the neutral wire on the input side of the residual current circuit breaker, if the first switch S... 00 Second switch S 01 Third switch S 02 Fourth switch S 03 Or the fifth switch S 04 If the circuit is closed, then TEST L and TEST N will immediately form a loop and generate current; the purpose of this design is to prevent the first switch S from being closed. 00 Second switch S 01 Third switch S 02 Fourth switch S 03 Or the fifth switch S 04 The problem occurs when the control module, such as the MCU, malfunctions or the MCU power supply fails, causing the first switch S to malfunction. 00 Second switch S 01 Third switch S 02 Fourth switch S 03 Or the fifth switch S 04 Dangerous situations caused by abnormal closure, such as when TEST L or TEST N is connected to the line, the resistance at the connection point is unstable. If the first switch S... 00 Second switch S 01 Third switch S 02 Fourth switch S 03 Or the fifth switch S 04 An abnormal closure will create an unstable current in the circuit, causing overheating and potential danger at the connection point. A transistor VT4 is used to control the on / off state of the leakage current selection circuit, even if the first switch S... 00 Second switch S 01 Third switch S02 , the fourth switch S 03 or the fifth switch S 04 Abnormal closing, the circuit will not form a current.

[0090] In some other embodiments, the rectifier voltage stabilizing circuit supplies power to the control module, not connected with the leakage current selection circuit, Figure 3 In the middle of the transistor VT4, the transistor VT4 collector and emitter short-circuit processing.

[0091] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0092] The above describes the specific embodiments of the present application in conjunction with the accompanying drawings, but is not intended to limit the protection scope of the present application. Those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A diagnostic device for cascading tripping of multi-stage residual current circuit breakers, characterized in that: include: The housing (1) is provided with a power interface (2), a test interface (3) and a display screen (4); the power interface (2) is used to connect to an external power source; the test interface (3) is used to connect to a diagnostic circuit. The rectifier and voltage regulator circuit is electrically connected to the power interface (2) and is used to provide a stable voltage for the leakage current selection circuit. The leakage current selection circuit is electrically connected to the test interface (3) and is used to select different leakage current diagnostic circuits according to the leakage current switch. The control module is electrically connected to the leakage current selection circuit and the display screen (4); The test interface (3) includes a phase wire access terminal and a neutral wire access terminal; The leakage current selection circuit includes a transistor VT4 and a switch selection circuit; The base of the transistor VT4 is connected to the output terminal of the rectifier and voltage regulator circuit, the collector of the transistor VT4 is electrically connected to one end of the switch selection circuit, and the emitter of the transistor VT4 is connected to the phase line input terminal of the test interface (3). The switch selection circuit includes a first switch S, one end of which is connected to the collector of transistor VT4. 00 Second switch S 01 Third switch S 02 Fourth switch S 03 and the fifth switch S 04 First switch S 00 Second switch S 01 Third switch S 02 Fourth switch S 03 and the fifth switch S 04 The other end is connected to the first resistor R. 00 Second resistor R 01 Third resistor R 02 Fourth resistor R 03 and the fifth resistor R 04 One end is connected; the first resistor R 00 Second resistor R 01 Third resistor R 02 Fourth resistor R 03 and the fifth resistor R 04 The other end of each is connected to the neutral wire access terminal of the test interface (3); The rectifier and voltage regulator circuit includes, in sequence, an AC step-down unit, a bridge rectifier unit, a filter unit, and a voltage regulator unit; The voltage regulation unit includes a reference voltage circuit, a sampling circuit, a comparison amplification circuit, and an adjustment circuit; the comparison amplification circuit amplifies the voltage difference provided by the sampling circuit and the reference voltage circuit and then controls the adjustment circuit to stabilize the output voltage. The AC step-down unit includes a transformer T, the primary side of which is electrically connected to both ends of the power interface (2), and the secondary side of which is electrically connected to the bridge rectifier unit. The bridge rectifier unit consists of four diodes: VD1, VD2, VD3, and VD4. The filter unit is capacitor C1, and the two ends of capacitor C1 are connected to the two ends of the bridge rectifier unit respectively. The voltage regulation unit includes a resistor R1, a regulating transistor VT1, an amplifying transistor VT3, a voltage regulator transistor VD5, a resistor R5, a resistor R6, a resistor R7, and a capacitor C2. in: One end of resistor R1 is connected to one end of capacitor C1 and the collector of regulating transistor VT1, and the other end of resistor R1 is connected to the base of regulating transistor VT1 and the collector of amplifying transistor VT3. The emitter of the regulating transistor VT1 is connected to one end of resistor R5, one end of resistor R6, and one end of capacitor C2; The emitter of amplifier tube VT3 is connected to the cathode of Zener tube VD5 and the other end of resistor R5. The base of amplifier transistor VT3 is connected to the other end of resistor R6 and one end of resistor R7; The other end of resistor R7 and the anode of Zener diode VD5 are both connected to the other end of capacitor C1 and then connected to ground terminal GND. The end of capacitor C2 that is connected to ground GND is connected to the base of transistor VT4.

2. The multi-stage leakage current switch over-tripping diagnostic device according to claim 1, characterized in that: A switch SK is provided between the rectifier and voltage regulator circuit and the switch selection circuit.

3. The multi-stage leakage current switch over-tripping diagnostic device according to claim 1, characterized in that: The voltage regulator unit also includes a protection circuit; The protection circuit includes a transistor VT2, the collector of transistor VT2 is connected to the collector of amplifier transistor VT3, the base of transistor VT2 is connected to one end of resistor R2 and one end of resistor R3, the emitter of transistor VT2 is connected to the end of capacitor C2 that is connected to ground GND, and a resistor R4 is connected in series between the emitter of transistor VT2 and the emitter of regulating transistor VT1. The other end of resistor R2 is connected to the emitter of regulating transistor VT1; One end of resistor R3 is connected to the ground terminal GND.

4. The multi-stage leakage current switch over-tripping diagnostic device according to claim 1, characterized in that: The display screen (4) is a touch screen, and a first switch S is configured on the display screen (4). 00 Second switch S 01 Third switch S 02 Fourth switch S 03 Fifth switch S 04 and switch SK; by manually clicking the first switch S on the display screen (4). 00 Second switch S 01 Third switch S 02 Fourth switch S 03 Fifth switch S 04 The SK switch can be used to open and close each switch.

5. The multi-stage leakage current switch over-tripping diagnostic device according to claim 1, characterized in that: The housing (1) is also provided with manual switches S0, S1, S2, S3 and S4, which are used to control the first switch S in the switch selection circuit. 00 Second switch S 01 Third switch S 02 Fourth switch S 03 and the fifth switch S 04 Opening and closing.

6. The multi-stage leakage current switch over-tripping diagnostic device according to claim 1, characterized in that: The first switch S 00 Second switch S 01 Third switch S 02 Fourth switch S 03 Fifth switch S 04 All switches are electrically connected to the control module, which controls the opening and closing of each switch.

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