Anti-maloperation device, multimeter device, and measurement method of multimeter device

Abstract

The invention provides an anti-maloperation device, a universal meter device and a measurement method of the universal meter device, and relates to the technical field of relay protection, the anti-maloperation device of the universal meter comprises an anti-maloperation circuit, the anti-maloperation circuit comprises a safety resistor, the safety resistor is connected in series between a universal meter body and a universal meter pen; the first switch module and the safety resistor are arranged in parallel, when the first switch module is in a closed state, the anti-misoperation circuit is in a zero-resistance state, and when the first switch module is in an open state, the anti-misoperation circuit is in a high-resistance state. The problem that in the prior art, in the using process of a universal meter, internal damage possibly occurs or a measuring gear is mistakenly selected, so that the outlet of secondary equipment in a transformer substation is mistakenly operated is solved, and the practicability of the anti-misoperation device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of relay protection, and in particular to an anti-malfunction device, a multimeter device, and a measurement method of the multimeter device. Background Art

[0002] When an existing multimeter is damaged internally or the measurement gear (resistance gear or current gear) is incorrectly selected, the overall loop resistance of the multimeter will be in a low resistance state, which is similar to a short circuit. In this state, using the multimeter to measure the ground potential of the secondary equipment outlet pressure plate in the substation will cause the secondary equipment outlet loop to be conductive to the ground, thereby causing the DC system to be grounded.

[0003] From the accidents that have occurred in recent years, we can see that when the DC system is grounded, it may cause equipment malfunction. Specifically, there are two reasons for malfunction: ① The discharge current caused by grounding causes the current type relay TBJ to operate (common relays can operate when the operating current is greater than 0.25A), which self-holds the circuit and causes tripping; ② The capacitor voltage difference caused by grounding is added to the voltage type relay TJR (voltage greater than 55% of the DC bus voltage can operate, and the operating power is not less than 5W) to cause the circuit to operate and trip. In general, during the use of the multimeter, there is a lack of methods to limit the current and voltage when the state is abnormal, which leads to malfunction of the equipment outlet.

[0004] There is no effective solution to the above technical problems. Summary of the invention

[0005] The main purpose of the present application is to provide an anti-maloperation device, a multimeter device and a measurement method for the multimeter device, so as to solve the problem in the prior art that the secondary equipment outlet in the substation may malfunction due to internal damage that may occur during the use of the multimeter or incorrect selection of the measurement gear.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, there is provided an anti-maloperation device for a multimeter, comprising an anti-maloperation circuit, the anti-maloperation circuit comprising: a safety resistor, the safety resistor is used to be connected in series between the multimeter body and the multimeter probe; a first switch module, the first switch module and the safety resistor are arranged in parallel with each other, when the first switch module is in a closed state, the anti-maloperation circuit is in a zero resistance state, and when the first switch module is in an open state, the anti-maloperation circuit is in a high resistance state.

[0007] Furthermore, the anti-maloperation circuit also includes: an indicator light circuit, the indicator light circuit at least includes an indicator light and an indicator light power supply arranged in series; wherein, a second switch module is also arranged on the indicator light circuit, and the second switch module is synchronously arranged with the state of the first switch module. When the second switch module is in a closed state, the indicator light is in a first display state, and when the second switch module is in an open state, the indicator light is in a second display state.

[0008] Further, the first switch module includes a first switch and a second switch arranged in series, and the second switch module includes a third switch and a fourth switch arranged in series, wherein the third switch is arranged synchronously with the first switch state, and the fourth switch is arranged synchronously with the second switch state.

[0009] Furthermore, the anti-maloperation device includes: a base, the base includes a base body and a connecting section arranged in sequence along a preset direction, wherein a safety resistor is arranged in the base body; a control component, at least part of the control component is arranged on the connecting section, and the control component is at least used to control the state switching of the first switch module; a sliding cover, at least part of the connecting section extends into the sliding cover, and the sliding cover is movably arranged with the base along a preset direction so that the sliding cover has a first working position covering the control component arranged on the connecting section and a second working position exposing at least part of the control component arranged on the connecting section.

[0010] Further, the connecting section includes a first connecting section close to the base body and a second connecting section away from the base body, and the control component includes: a control button, which is arranged on the first connecting section, and the control button is used to control the state switching of the fourth switch and the second switch; a contact pole component, the contact pole component includes a first contact pole arranged in the sliding cover and a second contact pole arranged on the second connecting section, the first contact pole is located between the second contact pole and the base body, when the first contact pole is in contact with the second contact pole, the third switch and the first switch are in a closed state, and when the first contact pole is separated from the second contact pole, the third switch and the first switch are in an open state; wherein, when the sliding cover is in the first working position, the control button is located in the sliding cover, and the first contact pole is separated from the second contact pole, and when the sliding cover is in the second working position, the control button is located outside the sliding cover, and the first contact pole is in contact with the second contact pole.

[0011] Furthermore, an elastic member is disposed in the sliding cover, one end of the elastic member is connected to the first connecting section, and the other end of the elastic member is connected to the inner wall of the sliding cover away from the base body.

[0012] According to another aspect of the present application, a multimeter device is provided, including a multimeter and an anti-malfunction device, wherein the anti-malfunction device is the anti-malfunction device described above.

[0013] According to another aspect of the present application, a measurement method of a multimeter device is provided, and the measurement method is performed using the above-mentioned multimeter device, and the measurement method includes: connecting an anti-malfunction device in series to a lead where any measuring probe of the multimeter is located; obtaining a measurement target of the part to be detected, wherein the measurement target includes at least one of the following: DC voltage, DC current, AC voltage and AC resistance; based on the measurement target, determining a target working state of the anti-malfunction device, wherein the target working state includes at least one of the following: a high resistance state and a zero resistance state; based on the target working state, generating a control instruction set, wherein the control instruction set is used to adjust the anti-malfunction device to the target working state; bringing the multimeter probe into contact with the part to be detected, and obtaining a measurement result.

[0014] Furthermore, based on the measurement target, the target working state of the anti-malfunction device is determined, including the following steps: determining the target gear of the multimeter according to the measurement target, the target gear including at least one of the following: voltage gear, current gear, resistance gear, on-off gear, capacitance gear, diode gear and transistor gear; when the target gear is determined to be any one of the current gear, resistance gear or on-off gear, determining the target working state of the anti-malfunction device to be a zero resistance state; when the target gear is determined to be the voltage gear, determining the target working state of the anti-malfunction device to be a high resistance state.

[0015] Furthermore, when it is determined that the target working state of the anti-malfunction device is a zero resistance state, a control instruction set is generated based on the target working state, and the control instruction set is used to adjust the anti-malfunction device to the target working state, including the following steps: based on the zero resistance state, a first control instruction in the control instruction set is generated, and the first control instruction is used to control the sliding cover to move in a direction away from the base body to a second working position, and control the control button to switch to a pressed state.

[0016] By applying the technical solution of the present application, a safety resistor is connected in series between the multimeter body and the multimeter probe, and the first switch module and the safety resistor are arranged in parallel with each other. When the multimeter is used normally, the first switch module is in a disconnected state, and the anti-malfunction circuit is in a high resistance state to limit the current and voltage in the multimeter measurement circuit. At this time, the setting of the safety resistor will not affect the voltage range measurement accuracy of the multimeter; when the current range, resistance range or on-off range of the multimeter is used, the first switch module is in a closed state, and the anti-malfunction circuit is in a zero resistance state, which will not affect the normal measurement of the multimeter. This setting avoids the misoperation of the secondary equipment outlet in the substation due to internal damage of the multimeter or incorrect selection of the measurement gear during the measurement process, solves the problem of misoperation of the secondary equipment outlet in the substation due to internal damage or incorrect selection of the measurement gear that may occur during the use of the multimeter in the prior art, and improves the practicality of the anti-maloperation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 A schematic structural diagram of a first embodiment of an anti-malfunction device according to the present application is shown;

[0019] Figure 2 A schematic structural diagram of a second embodiment of the anti-malfunction device according to the present application is shown;

[0020] Figure 3 A structural schematic diagram of an embodiment of an indicator light assembly according to the present application is shown.

[0021] The above drawings include the following reference numerals:

[0022] 10. Base;

[0023] 11. Base body;

[0024] 12. The first connecting section;

[0025] 13. Second connecting section;

[0026] 14. Elastic parts;

[0027] 15. Safety resistor;

[0028] 20. Slide cover;

[0029] 30. Control components;

[0030] 31. contact electrode assembly; 311. first contact electrode; 312. second contact electrode; 32. control button;

[0031] 40. Indicator light circuit; 41. Indicator light; 42. Indicator light power supply; 43. First resistor; 44. Second resistor;

[0032] 51. Multimeter body; 52. Multimeter probes;

[0033] 300, first switch module; 310, first switch; 320, second switch;

[0034] 60. Second switch module; 61. Third switch; 62. Fourth switch. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0039] It should be noted that during the use of the multimeter, incorrect gear selection or inadequate gear conversion due to improper operation may cause the relay protection device outlet to malfunction, or the power supply or voltage air switch to trip erroneously, affecting the safe operation of the power grid system. The cause of the malfunction is that the multimeter gear is incorrect or the gear is not in place, causing the multimeter circuit to be short-circuited, thereby causing the circuit to short-circuit to the ground when measuring the outlet potential to the ground or the terminal potential to the ground, and then causing the secondary equipment to malfunction or the related air switch to trip. The anti-malfunction device for the multimeter provided in the present application and the multimeter device having the same are mainly used for measuring the secondary circuit of the power system, and relate to the field of relay protection.

[0040] Combination Figures 1 to 3 In a specific embodiment of the present application, a device for preventing misoperation of a multimeter is provided, and the device for preventing misoperation includes a circuit for preventing misoperation.

[0041] Specifically, the anti-malfunction circuit includes: a safety resistor 15 and a first switch module 300, the safety resistor 15 is used to be connected in series between the multimeter body 51 and the multimeter probe 52; the first switch module 300 and the safety resistor 15 are arranged in parallel with each other, when the first switch module 300 is in a closed state, the anti-malfunction circuit is in a zero resistance state, and when the first switch module 300 is in an open state, the anti-malfunction circuit is in a high resistance state.

[0042] It should be noted that there are two reasons for false operation when measuring the potential of the equipment outlet to the ground: ① The capacitive discharge current caused by the grounding of the measuring loop causes the current type relay TBJ to operate (generally, the current is greater than 0.25A and can operate), which will self-hold the loop and cause the tripping to occur; ② The capacitive voltage difference caused by the grounding of the measuring loop is added to the voltage type relay TJR (the voltage is greater than 55% of the DC bus voltage and can operate, and the relay starting power is above 5W) to cause the loop to operate and trip. In general, limiting the current and voltage when grounding is the key to preventing false operation. There are currently only two DC voltage levels of 110V / 220V in the substation, and the internal resistance of the voltage range of the common multimeter at work is above 10MΩ. Therefore, a 10kΩ resistor can be selected as a high-value resistor and connected in series in the measuring loop to limit the current and voltage of the measuring loop, while basically not affecting the measured voltage (the voltage measurement accuracy is higher than 0.1%).

[0043] Combination Figure 1 As shown, in this embodiment, the resistance of the safety resistor 15 is greater than or equal to 10kΩ, and the safety resistor 15 is connected in series between the multimeter body 51 and the multimeter probe 52 to limit the current and voltage in the multimeter measurement circuit. When the multimeter is used normally, the anti-malfunction circuit is in a high resistance state (that is, the resistance of the anti-malfunction circuit is greater than or equal to 10kΩ), and the setting of the safety resistor 15 will not affect the voltage range measurement accuracy of the multimeter (the voltage measurement accuracy is higher than 0.1%); when the current range, resistance range or on-off range of the multimeter is used, the anti-malfunction circuit is in a zero resistance state (the resistance is less than 0.1Ω), which will not affect the normal measurement of the multimeter. This setting avoids the misoperation of the secondary equipment outlet in the substation due to internal damage of the multimeter or wrong selection of the measurement range during the measurement process, solves the problem of misoperation of the secondary equipment outlet in the substation due to internal damage or wrong selection of the measurement range that may occur during the use of the multimeter in the prior art, and improves the practicality of the anti-maloperation device.

[0044] Furthermore, the first switch module 300 may include one switch or multiple switches. In one embodiment of the present application, the first switch module 300 includes a switch. When the switch is closed, the first switch module 300 is in a closed state, and the anti-maloperation circuit is in a zero resistance state; when the switch is disconnected, the first switch module 300 is in a disconnected state, and the anti-maloperation circuit is in a high resistance state.

[0045] In another preferred embodiment of the present application, the first switch module 300 includes a plurality of switches. When the plurality of switches are closed, the first switch module 300 is in a closed state. When at least one of the plurality of switches is disconnected, the first switch module 300 is in an disconnected state. This arrangement allows the high resistance state of the anti-malfunction circuit to be switched to a zero resistance state by closing a plurality of switches at the same time, thereby avoiding the state switching of the anti-malfunction circuit caused by the switch being accidentally touched (closed), resulting in the malfunction of the secondary equipment outlet in the substation, and improving the stability of the anti-malfunction device.

[0046] In another embodiment of the present application, the first switch module 300 may include but is not limited to at least one of a micro switch, a rocker switch and an electronic switch, as long as the anti-malfunction circuit can be switched between a high resistance state and a zero resistance state.

[0047] Furthermore, the anti-maloperation circuit also includes an indicator light circuit 40, which includes at least an indicator light 41 and an indicator light power supply 42 arranged in series; wherein, a second switch module 60 is also arranged on the indicator light circuit 40, and the second switch module 60 is synchronously arranged with the state of the first switch module 300. When the second switch module 60 is in a closed state, the indicator light 41 is in a first display state, and when the second switch module 60 is in an open state, the indicator light 41 is in a second display state.

[0048] In this embodiment, the second switch module 60 is synchronously set with the state of the first switch module 300, so that different working states of the anti-misoperation circuit can be indicated by the display state of the indicator light 41. When the multimeter is used conventionally, the first switch module 300 is in the disconnected state, the second switch module 60 is in the disconnected state, the anti-misoperation circuit is in the high resistance state, and the indicator light 41 is in the first display state, wherein the first display state may include an off state and a first brightness constant light state; when the current range, resistance range or on-off range of the multimeter is used, the first switch module 300 is in the closed state, the second switch module 60 is in the closed state, the anti-misoperation circuit is in the zero resistance state (resistance is less than 0.1Ω), and the indicator light 41 is in the second display state, and the second display state includes a flashing state of the second brightness and a second brightness constant light state, so as to prompt the measurement personnel that the anti-misoperation circuit is in the zero resistance state at this time. Among them, the first brightness is less than the second brightness. In a specific embodiment of the present application, the first brightness is a darker brightness, and the second brightness is a brighter brightness or a bright state, so as to prompt the operator when the anti-malfunction circuit is in a zero resistance state.

[0049] Furthermore, the first switch module 300 includes a first switch 310 and a second switch 320 arranged in series, and the second switch module 60 includes a third switch 61 and a fourth switch 62 arranged in series, wherein the third switch 61 is arranged synchronously with the state of the first switch 310, and the fourth switch 62 is arranged synchronously with the state of the second switch 320. Such an arrangement realizes the linkage between the anti-maloperation circuit and the indicator light circuit 40, making the control process more convenient and improving the convenience of the anti-maloperation device.

[0050] In this embodiment, when the multimeter is used normally, at least one of the first switch 310 and the second switch 320 is in the open state, at least one of the third switch 61 and the fourth switch 62 is in the open state, the anti-malfunction circuit is in a high resistance state, and the indicator light 41 is in the first display state, wherein the first display state may include an off state and a darker constantly lit state; when the current range, resistance range or on-off range of the multimeter is used, the first switch 310 and the second switch 320 are both in the closed state, the third switch 61 and the fourth switch 62 are both in the closed state, the anti-malfunction circuit is in a zero resistance state (resistance is less than 0.1Ω), and the indicator light 41 is in the second display state, the second display state includes a flashing state of a second brightness and a constantly lit state of a second brightness, to prompt the measurement personnel that the anti-malfunction circuit is in a zero resistance state at this time, thereby improving the safety of the anti-malfunction device.

[0051] Combination Figure 1As shown, the indicator light circuit 40 includes an indicator light 41, an indicator light power supply 42, a first resistor 43 and a second resistor 44 arranged in series, wherein the indicator light 41, the indicator light power supply 42, the first resistor 43, the second resistor 44 and the third switch 61 are arranged in series, and the fourth switch 62 is arranged in parallel with the second resistor 44, wherein the resistance value of the first resistor 43 can be 200~400Ω, and the resistance value of the second resistor 44 can be 4.5~5.5kΩ. In a preferred embodiment of the present application, the resistance of the first resistor 43 is 300Ω, the resistance of the second resistor 44 is 5.1kΩ, and when the third switch 61 is disconnected, there is no current in the indicator light circuit 40, and the indicator light 41 is in the off state in the first display state; when the third switch 61 is closed and the fourth switch 62 is disconnected, the indicator light 41, the indicator light power supply 42, the first resistor 43 and the second resistor 44 are connected in series, and the resistance in the indicator light circuit 40 is 5.4kΩ, and the indicator light 41 is in the darker constant light state in the first display state; when the third switch 61 and the fourth switch 62 are both closed, the indicator light 41, the indicator light power supply 42 and the first resistor 43 are connected in series, and the second resistor 44 is short-circuited by the fourth switch 62. At this time, the resistance in the indicator light circuit 40 is 300Ω, and the indicator light 41 is in the brighter flashing state in the second display state. Since the third switch 61 is set synchronously with the state of the first switch 310, and the fourth switch 62 is set synchronously with the state of the second switch 320, the measurement personnel can directly observe the different working states of the anti-mistouch circuit through the display state of the indicator light 41, thereby reducing the safety hazards during the measurement process.

[0052] Combination Figure 2 and Figure 3 As shown, the anti-malfunction device includes a base 10, a slide cover 20 and a control component 30, the base 10 includes a base body 11 and a connecting section arranged in sequence along a preset direction, wherein a safety resistor 15 is arranged in the base body 11; at least part of the control component 30 is arranged on the connecting section, and the control component 30 is at least used to control the state switching of the first switch module 300; at least part of the connecting section extends into the slide cover 20, and the slide cover 20 is movably arranged with the base 10 along the preset direction, so that the slide cover 20 has a first working position (combined with the first working position) covering the control component 30 arranged on the connecting section. Figure 2 ) and a second working position (combined with Figure 3 shown).

[0053] Among them, when the multimeter is used normally, the sliding cover 20 is located in the first working position, and the control component 30 controls the first switch module 300 to be in the disconnected state, at which time the anti-malfunction circuit is in the high resistance state; when the current range, resistance range or on-off range of the multimeter is used, the sliding cover 20 is first moved to the second working position, and then the first switch module 300 is controlled to be in the closed state through the control component 30, at which time the anti-malfunction circuit is in the zero resistance state (resistance is less than 0.1Ω). Such a setting can realize the switching of the high resistance state of the anti-malfunction circuit to the zero resistance state through two steps (first moving the sliding cover 20 to the second working position, and then controlling the first switch module 300 to be in the closed state through the control component 30), thereby avoiding the mis-touch that may occur when only the control component 30 is set to control the first switch module 300, resulting in the switching of the anti-malfunction circuit state, causing the secondary equipment outlet in the substation to malfunction.

[0054] Furthermore, the connecting section includes a first connecting section 12 close to the base body 11 and a second connecting section 13 away from the base body 11. The control component 30 includes a contact electrode component 31 and a control button 32. The control button 32 is arranged on the first connecting section 12. The control button 32 is used to control the state switching of the fourth switch 62 and the second switch 320. The contact electrode component 31 includes a first contact electrode 311 arranged in the sliding cover 20 and a second contact electrode 312 arranged on the second connecting section 13. The first contact electrode 311 is located between the second contact electrode 312 and the base body 11. When the first contact pole 311 contacts the second contact pole 312, the third switch 61 and the first switch 310 are in a closed state, and when the first contact pole 311 and the second contact pole 312 are separated, the third switch 61 and the first switch 310 are in an open state; wherein, when the sliding cover 20 is in the first working position, the control button 32 is located inside the sliding cover 20, and the first contact pole 311 and the second contact pole 312 are separated, and when the sliding cover 20 is in the second working position, the control button 32 is located outside the sliding cover 20, and the first contact pole 311 contacts the second contact pole 312. The state switching of the third switch 61 and the first switch 310 is controlled by the first contact pole 311 and the second contact pole 312, and the state switching of the fourth switch 62 and the second switch 320 is controlled by the control button 32, thereby improving the reliability of the anti-mistouch device.

[0055] Combination Figure 2 As shown, when the multimeter is used normally, the slide cover 20 is located in the first working position, and the control button 32 is located inside the slide cover 20. At this time, the first contact pole 311 is separated from the second contact pole 312, the first switch 310 and the third switch 61 are both disconnected, the control button 32 controls the fourth switch 62 and the second switch 320 to be disconnected, the anti-malfunction circuit is in a high resistance state, and the indicator light 41 is in the off state in the first display state.

[0056] Combination Figure 3As shown, when using the current range, resistance range or on-off range of the multimeter, first move the slide cover 20 to the second working position so that the control button 32 is located outside the slide cover 20. At this time, the first contact electrode 311 contacts the second contact electrode 312, the first switch 310 and the third switch 61 are both closed, the control button 32 controls the fourth switch 62 and the second switch 320 to be disconnected, the anti-malfunction circuit is still in a high resistance state, and the indicator light 41 is in a darker constant light state in the first display state.

[0057] Combination Figure 3 As shown, when using the current range, resistance range or on / off range of the multimeter, after the slide cover 20 is moved to the second working position, the control button 32 is located outside the slide cover 20, and the control button 32 is pressed. At this time, the first contact electrode 311 contacts the second contact electrode 312, the first switch 310 and the third switch 61 are both closed, the control button 32 controls the fourth switch 62 and the second switch 320 to be closed, the anti-malfunction circuit is in a zero resistance state, and the indicator light 41 is in a brighter flashing state in the second display state.

[0058] Furthermore, an elastic member 14 is further provided in the slide cover 20, one end of the elastic member 14 is connected to the first connecting section 12, and the other end of the elastic member 14 is connected to the inner wall of the slide cover 20 away from the base body 11. When the slide cover 20 is in the first working position, the elastic member 14 is in the initial state, and when a force is applied to move the slide cover 20 from the first working position to the second working position, the elastic member 14 is in the stretched state, and when the force applied to the slide cover 20 disappears, the elastic member 14 generates an elastic force to restore from the stretched state to the initial state, thereby driving the slide cover 20 to move from the second working position to the first working position, realizing the reset of the slide cover 20 and covering the control assembly 30 (at this time, the control assembly 30 is completely in the slide cover 20), avoiding accidental touch caused by the control assembly 30 being exposed outside the slide cover 20, and reducing safety hazards.

[0059] In another embodiment of the present application, a multimeter device is provided, including a multimeter and an anti-maloperation device, wherein the anti-maloperation device is the anti-maloperation device in the above embodiment.

[0060] Specifically, the anti-malfunction circuit includes: a safety resistor 15 and a first switch module 300, the safety resistor 15 is used to be connected in series between the multimeter body 51 and the multimeter probe 52; the first switch module 300 and the safety resistor 15 are arranged in parallel with each other, when the first switch module 300 is in a closed state, the anti-malfunction circuit is in a zero resistance state, and when the first switch module 300 is in an open state, the anti-malfunction circuit is in a high resistance state. This arrangement avoids the misoperation of the secondary equipment outlet in the substation due to internal damage of the multimeter or wrong selection of the measurement gear during the measurement process, solves the problem of misoperation of the secondary equipment outlet in the substation due to internal damage or wrong selection of the measurement gear that may occur during the use of the multimeter in the prior art, and improves the practicality of the anti-malfunction device.

[0061] In another embodiment of the present application, a measurement method of a multimeter device is also provided. The measurement method is performed using the above-mentioned multimeter device, and the measurement method includes the following steps:

[0062] Step S1: Connect the anti-malfunction device in series to any lead of the multimeter where the measuring probe is located.

[0063] In step S1, one end of the anti-malfunction device is electrically connected to the multimeter body, and the other end of the anti-malfunction device is electrically connected to the multimeter probe. This arrangement realizes connecting the safety resistor 15 in series between the multimeter body 51 and the multimeter probe 52 to limit the current and voltage in the multimeter measurement circuit.

[0064] Step S2: obtaining a measurement target of the component to be tested, wherein the measurement target includes at least one of the following: direct current voltage, direct current, alternating current voltage and alternating current resistance.

[0065] Step S3: Based on the measurement target, determine the target working state of the anti-malfunction device, the target working state includes at least one of the following: a high resistance state and a zero resistance state.

[0066] Step S4: Based on the target working state, a control instruction set is generated, and the control instruction set is used to adjust the anti-malfunction device to the target working state.

[0067] Step S5: contact the multimeter probe with the object to be tested and obtain the measurement result.

[0068] Through the above steps, the anti-maloperation device is connected in series to the lead of any measuring probe of the multimeter. According to the measurement target of the part to be tested, the anti-maloperation device is adjusted to the target working state, and then the multimeter probe is brought into contact with the part to be tested to obtain the measurement result, thereby avoiding maloperation of the secondary equipment outlet in the substation due to internal damage of the multimeter or incorrect selection of the measurement gear during the measurement process, thereby achieving safe measurement.

[0069] Optionally, determining a target working state of the anti-malfunction device based on the measurement target includes the following steps:

[0070] Step S31: determining a target gear of the multimeter according to a measurement target, wherein the target gear includes at least one of the following: voltage gear, current gear, resistance gear, on-off gear, capacitance gear, diode gear and transistor gear.

[0071] In step S31, the target gear of the multimeter needs to be determined according to the measurement target. The multimeter is a multifunctional measuring tool that can measure voltage, current, resistance, continuity, capacitance, diodes and transistors, etc. The selection of the target gear depends on the physical quantity to be measured.

[0072] Step S32: when it is determined that the target gear is any one of the current gear, the resistance gear or the on-off gear, the target working state of the anti-malfunction device is determined to be a zero resistance state.

[0073] In step S32, if the determined target gear is the current gear, the resistance gear or the on-off gear, the target working state of the anti-malfunction device is set to the zero resistance state. This setting ensures that in these measurement modes, measurement errors of current or resistance caused by misoperation are prevented.

[0074] Step S33: when it is determined that the target gear is the voltage gear, the target working state of the anti-malfunction device is determined to be a high resistance state.

[0075] In step S33, if the determined target gear is the voltage gear, the target working state of the anti-malfunction device is set to a high resistance state in order to protect the circuit from damage.

[0076] Through the above steps, it can be ensured that when the multimeter is used for measurement, the anti-malfunction device can automatically adjust its working state according to the measurement target, thereby improving the accuracy and safety of the measurement.

[0077] Further, when it is determined that the target working state of the anti-malfunction device is a zero resistance state, a control instruction set is generated based on the target working state, and the control instruction set is used to adjust the anti-malfunction device to the target working state, including the following steps:

[0078] Step S41: Based on the zero resistance state, a first control instruction in the control instruction set is generated, the first control instruction is used to control the sliding cover to move in a direction away from the base body to a second working position, and control the control button to switch to a pressed state.

[0079] In step S41, the slide cover 20 moves to the second working position in the direction away from the base body, the first contact pole 311 contacts the second contact pole 312, the first switch 310 and the third switch 61 are both closed, the control button 32 is located outside the slide cover 20, the control button 32 is switched to the pressing state, the fourth switch 62 and the second switch 320 are both closed, the anti-malfunction circuit is in the zero resistance state, and the indicator light 41 is in the brighter flashing state in the second display state. The control slide cover can be moved to the second working position in the direction away from the base body by manual operation or program control, and the state switching of the control button can be achieved by manual operation or program control.

[0080] Step S42: Based on the high resistance state, generate a second control instruction in the control instruction set, the second control instruction is used to control the control button to switch to the initial state.

[0081] In step S42, the control button switches to the initial state, the fourth switch 62 and the second switch 320 are both disconnected, the anti-malfunction circuit is in a high resistance state, and if the sliding cover is in the second working position at this time, the indicator light 41 is in a darker constant light state in the first display state.

[0082] In step S42, the control button switches to the initial state, the fourth switch 62 and the second switch 320 are both disconnected, and the anti-malfunction circuit is in a high resistance state. If the sliding cover is in the first working position at this time, the first switch 310 and the third switch 61 are both disconnected, then the indicator light 41 is in the off state in the first display state.

[0083] Step S43: Based on the high resistance state, a third control instruction in the control instruction set is generated, and the third control instruction is used to control the sliding cover to move to the first working position in a direction close to the base body.

[0084] In step S43, the sliding cover moves to the first working position in the direction close to the base body, and the first switch 310 and the third switch 61 are both disconnected. At this time, no matter whether the control button is in the initial state or the pressed state, the indicator light 41 is in the off state in the first display state. Specifically, the control sliding cover can be moved to the second working position in the direction close to the base body by manual operation or program control, and the state switching of the control button can be achieved by manual operation or program control.

[0085] The anti-malfunction device can be adjusted to a high resistance state by at least one of step S42 and step S43. The default working state of the anti-malfunction device is a high resistance state, and it can be switched to a zero resistance state in certain occasions, but it needs to be maintained in a zero resistance state by human or program operation, otherwise it will return to a high resistance state.

[0086] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0087] 1. The resistance of the safety resistor 15 is greater than or equal to 10kΩ. The safety resistor 15 is connected in series between the multimeter body 51 and the multimeter probe 52 to limit the current and voltage in the multimeter measurement circuit. When the multimeter is used normally, the anti-malfunction circuit is in a high resistance state. At this time, the setting of the safety resistor will not affect the voltage range measurement accuracy of the multimeter (the voltage measurement accuracy is higher than 0.1%); when the current range, resistance range or on-off range of the multimeter is used, the anti-malfunction circuit is in a zero resistance state (resistance is less than 0.1Ω), which will not affect the normal measurement of the multimeter. This setting avoids the misoperation of the secondary equipment outlet in the substation due to internal damage of the multimeter or wrong selection of the measurement range during the measurement process, solves the problem of misoperation of the secondary equipment outlet in the substation due to internal damage or wrong selection of the measurement range that may occur during the use of the multimeter in the prior art, and improves the practicality of the anti-maloperation device.

[0088] 2. When the multimeter is used normally, the anti-malfunction circuit is in a high-resistance state. In specific situations, the anti-malfunction circuit can be switched to a zero-resistance state, but it needs to be maintained in a zero-resistance state by human or program operation, otherwise it will return to a high-resistance state (i.e., the high-resistance state is the default working state), thereby preventing the relay protection device or the secondary circuit from malfunctioning or tripping due to a short circuit during the use of the multimeter.

[0089] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0090] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0091] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] The above description 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 may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0093] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0094] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0095] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0096] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0097] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

[0098] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A malfunction prevention device for a multimeter, characterized in that: The invention comprises an anti-malfunction circuit, wherein the anti-malfunction circuit comprises: A safety resistor (15), the safety resistor (15) being connected in series between a multimeter body (51) and a multimeter probe (52); A first switch module (300), wherein the first switch module (300) and the safety resistor (15) are arranged in parallel with each other; when the first switch module (300) is in a closed state, the anti-malfunction circuit is in a zero resistance state; and when the first switch module (300) is in an open state, the anti-malfunction circuit is in a high resistance state.

2. The anti-malfunction device according to claim 1, characterized in that: The anti-malfunction circuit also includes: An indicator light circuit (40), the indicator light circuit (40) comprising at least an indicator light (41) and an indicator light power supply (42) arranged in series; The indicator light circuit (40) is further provided with a second switch module (60), and the second switch module (60) is synchronously arranged with the state of the first switch module (300); when the second switch module (60) is in a closed state, the indicator light (41) is in a first display state; and when the second switch module (60) is in an open state, the indicator light (41) is in a second display state.

3. The anti-malfunction device according to claim 2, characterized in that: The first switch module (300) comprises a first switch (310) and a second switch (320) which are arranged in series, and the second switch module (60) comprises a third switch (61) and a fourth switch (62) which are arranged in series, wherein the third switch (61) is arranged in synchronization with the state of the first switch (310), and the fourth switch (62) is arranged in synchronization with the state of the second switch (320).

4. The anti-malfunction device according to claim 3, characterized in that: The anti-malfunction device comprises: A base (10), the base (10) comprising a base body (11) and a connecting section arranged in sequence along a preset direction, wherein the safety resistor (15) is arranged in the base body (11); a control component (30), at least a portion of the control component (30) being arranged on the connecting section, the control component (30) being at least used for controlling the state switching of the first switch module (300); A sliding cover (20), wherein at least a portion of the connecting section extends into the sliding cover (20), and the sliding cover (20) is movably arranged with the base (10) along the preset direction, so that the sliding cover (20) has a first working position covering the control component (30) arranged on the connecting section and a second working position exposing at least a portion of the control component (30) arranged on the connecting section.

5. The anti-malfunction device according to claim 4, characterized in that: The connecting section comprises a first connecting section (12) close to the base body (11) and a second connecting section (13) far from the base body (11), and the control component (30) comprises: a control button (32), the control button (32) being arranged on the first connecting section (12), the control button (32) being used to control the state switching of the fourth switch (62) and the second switch (320); A contact electrode assembly (31), the contact electrode assembly (31) comprising a first contact electrode (311) arranged in the sliding cover (20) and a second contact electrode (312) arranged on the second connecting section (13), the first contact electrode (311) being located between the second contact electrode (312) and the base body (11), when the first contact electrode (311) is in contact with the second contact electrode (312), the third switch (61) and the first switch (310) are in a closed state, and the first contact electrode (311) and the second contact electrode (312) are in a closed state. When the second contact pole (312) is separated, the third switch (61) and the first switch (310) are in a disconnected state; wherein, when the sliding cover (20) is in the first working position, the control button (32) is located inside the sliding cover (20), and the first contact pole (311) is separated from the second contact pole (312); when the sliding cover (20) is in the second working position, the control button (32) is located outside the sliding cover (20), and the first contact pole (311) is in contact with the second contact pole (312).

6. The anti-malfunction device according to claim 5, characterized in that: An elastic member (14) is also provided inside the sliding cover (20), one end of the elastic member (14) is connected to the first connecting section (12), and the other end of the elastic member (14) is connected to the inner wall of the sliding cover (20) away from the base body (11).

7. A multimeter device, comprising a multimeter and an anti-malfunction device, characterized in that: The anti-malfunction device is the anti-malfunction device according to any one of claims 1 to 6.

8. A measuring method of a multimeter device, characterized in that: The measuring method is performed using the multimeter device described in claim 7, and the measuring method comprises: Connect the anti-malfunction device in series to any lead of the multimeter where the measuring probe is located; Acquire a measurement target of the part to be tested, wherein the measurement target includes at least one of the following: direct current voltage, direct current, alternating current voltage and alternating current resistance; Based on the measurement target, determining a target working state of the anti-malfunction device, wherein the target working state includes at least one of the following: a high resistance state and a zero resistance state; Based on the target working state, generating a control instruction set, wherein the control instruction set is used to adjust the anti-malfunction device to the target working state; The multimeter probe is brought into contact with the object to be tested, and a measurement result is obtained.

9. The measuring method according to claim 8, characterized in that: Based on the measurement target, determining the target working state of the anti-malfunction device comprises the following steps: Determining a target gear of the multimeter according to the measurement target, wherein the target gear includes at least one of the following: voltage gear, current gear, resistance gear, on-off gear, capacitance gear, diode gear and transistor gear; When the target gear is determined to be any one of the current gear, the resistance gear or the on-off gear, the target working state of the anti-malfunction device is determined to be the zero resistance state; When it is determined that the target gear is the voltage gear, the target working state of the anti-malfunction device is determined to be the high resistance state.

10. The measuring method according to claim 8, characterized in that: When it is determined that the target working state of the anti-malfunction device is the zero resistance state, a control instruction set is generated based on the target working state, and the control instruction set is used to adjust the anti-malfunction device to the target working state, including the following steps: Based on the zero resistance state, a first control instruction in a control instruction set is generated, wherein the first control instruction is used to control the sliding cover to move to a second working position in a direction away from the base body and control the control button to switch to a pressed state.

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