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

Abstract

The application provides a misoperation prevention device, a multimeter device and a measurement method of the multimeter device, and relates to the technical field of relay protection. The misoperation prevention device of the multimeter comprises a misoperation prevention circuit, and the misoperation prevention circuit comprises: a safety resistor, which is used to be connected in series between a multimeter body and a multimeter pen; and a first switch module, which is arranged in parallel with the safety resistor. When the first switch module is in a closed state, the misoperation prevention circuit is in a zero resistance state. When the first switch module is in an open state, the misoperation prevention circuit is in a high resistance state. Through the technical scheme, the problem that the secondary equipment outlet in a transformer substation is misoperated due to internal damage or incorrect selection of a measurement range during the use of the multimeter in the prior art is solved, and the practicability of the misoperation prevention device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relay protection, in particular to a misoperation prevention device, a multimeter device and a measurement method of the multimeter device. BACKGROUND

[0002] When the existing multimeter is internally damaged or the measurement range (resistance range or current range) is selected incorrectly, the overall loop resistance of the multimeter presents 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 panel in a 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 accident events in recent years, it can be seen that when the DC system is grounded, it may cause the equipment to malfunction. Specifically, there are two reasons for the malfunction: ① the discharge current caused by grounding causes the current type relay TBJ to act (the common relay action current is greater than 0.25A, which can act), which makes the loop self-holding, thereby causing the trip to occur; ② the voltage difference caused by the capacitance voltage caused by grounding is added to the voltage type relay TJR (the voltage is greater than 55% of the DC bus voltage, which can act, and the action power is not less than 5W), which makes the loop act and trip. In general, during the use of the multimeter, there is a lack of method to limit the current and voltage when the state is abnormal, thereby causing the equipment outlet to malfunction.

[0004] For the above technical problems, no effective solution has been proposed. SUMMARY

[0005] The main purpose of the present application is to provide a misoperation prevention device, a multimeter device and a measurement method of the multimeter device, so as to solve the problem that the secondary equipment outlet in a substation malfunctions due to internal damage or incorrect selection of the measurement range during the use of the multimeter in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a misoperation prevention device for a multimeter is provided, which comprises a misoperation prevention circuit, the misoperation prevention circuit comprising: a safety resistor, the safety resistor being connected in series between the multimeter body and the multimeter pen; and a first switch module, the first switch module being arranged in parallel with the safety resistor, when the first switch module is in a closed state, the misoperation prevention circuit is in a zero resistance state, and when the first switch module is in an open state, the misoperation prevention circuit is in a high resistance state.

[0007] Further, the anti-misoperation circuit further comprises an indicator lamp circuit, the indicator lamp circuit comprising at least an indicator lamp and an indicator lamp power supply arranged in series; wherein the second switch module is arranged on the indicator lamp circuit and is arranged synchronously with the state of the first switch module; when the second switch module is in a closed state, the indicator lamp is in a first display state; and when the second switch module is in an open state, the indicator lamp is in a second display state.

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

[0009] Further, the anti-misoperation device comprises a base, the base comprising a base body and a connecting segment arranged in sequence along a preset direction, wherein the base body is provided with a safety resistor; a control assembly, at least part of the control assembly being arranged on the connecting segment, the control assembly being used at least for controlling the state switching of the first switch module; and a sliding cover, at least part of the connecting segment extending into the sliding cover, the sliding cover being movably arranged with the base along the preset direction, so that the sliding cover has a first working position covering the control assembly arranged on the connecting segment and a second working position exposing at least part of the control assembly arranged on the connecting segment.

[0010] Further, the connecting segment comprises a first connecting segment close to the base body and a second connecting segment away from the base body, and the control assembly comprises a control button arranged on the first connecting segment and used for controlling the state switching of the fourth switch and the second switch; and a contact pole assembly comprising a first contact pole arranged in the sliding cover and a second contact pole arranged on the second connecting segment, the first contact pole being located between the second contact pole and the base body, the third switch and the first switch being in a closed state when the first contact pole and the second contact pole are in contact, and the third switch and the first switch being in an open state when the first contact pole and the second contact pole are separated; 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 and the second contact pole are separated, 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 and the second contact pole are in contact.

[0011] Further, the sliding cover is further provided with an elastic member, one end of the elastic member being connected with the first connecting segment and the other end of the elastic member being connected with an 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, comprising a multimeter and an anti-misoperation device, the anti-misoperation device being the anti-misoperation device described above.

[0013] According to another aspect of the present application, a measurement method of a multimeter device is provided, the measurement method is performed by the multimeter device described above, and the measurement method comprises the following steps: connecting the anti-misoperation device to a lead wire where any measurement probe of the multimeter is located; obtaining a measurement target of a to-be-detected component, wherein the measurement target comprises at least one of the following: a direct-current voltage, a direct-current current, an alternating-current voltage, and an alternating-current resistance; determining a target working state of the anti-misoperation device based on the measurement target, wherein the target working state comprises at least one of the following: a high-resistance state and a zero-resistance state; generating a control instruction set based on the target working state, wherein the control instruction set is used to adjust the anti-misoperation device to the target working state; and contacting the multimeter probe with the to-be-detected component and obtaining a measurement result.

[0014] Further, the determination of the target working state of the anti-misoperation device based on the measurement target comprises the following steps: determining a target gear of the multimeter according to the measurement target, wherein the target gear comprises at least one of the following: a voltage gear, a current gear, a resistance gear, a continuity gear, a capacitor gear, a diode gear, and a triode gear; in a case where the target gear is determined to be any one of the current gear, the resistance gear, or the continuity gear, the target working state of the anti-misoperation device is determined to be the zero-resistance state; and in a case where the target gear is determined to be the voltage gear, the target working state of the anti-misoperation device is determined to be the high-resistance state.

[0015] Further, in a case where the target working state of the anti-misoperation device is determined to be the zero-resistance state, the generation of the control instruction set based on the target working state, wherein the control instruction set is used to adjust the anti-misoperation device to the target working state, comprises the following steps: generating a first control instruction in the control instruction set based on the zero-resistance state, wherein the first control instruction is used to control the sliding cover to move to the second working position in the direction away from the base body and to control the control button to switch to the pressed state.

[0016] By applying the technical solution of the present application, the safety resistor is connected in series between the multimeter body and the multimeter probe, and the first switch module is arranged in parallel with the safety resistor. In the normal use of the multimeter, the first switch module is in the open state, and the anti-misoperation circuit is in the high-resistance state, so as to limit the current and voltage in the measurement loop of the multimeter. At this time, the setting of the safety resistor will not affect the voltage gear measurement accuracy of the multimeter. In the use of the current gear, the resistance gear, or the continuity gear of the multimeter, the first switch module is in the closed state, and the anti-misoperation circuit is in the zero-resistance state, which will not affect the normal measurement of the multimeter. Such a setting avoids the misoperation of the secondary equipment outlet in the substation caused by the internal damage or the wrong selection of the measurement gear of the multimeter during the measurement process, solves the problem of the misoperation of the secondary equipment outlet in the substation caused by the internal damage or the wrong selection of the measurement gear of the multimeter during the use of the multimeter in the prior art, and improves the practicability of the anti-misoperation device. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

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

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

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

[0021] Among the above drawings, the following reference signs are included:

[0022] 10, base;

[0023] 11, base body;

[0024] 12, first connecting section;

[0025] 13, second connecting section;

[0026] 14, elastic member;

[0027] 15, safety resistor;

[0028] 20, sliding cover;

[0029] 30, control assembly;

[0030] 31, contact pole assembly; 311, first contact pole; 312, second contact pole; 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 probe;

[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 the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] 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. 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.

[0037] It is to be understood that the terms "first", "second", and the like, used in the specification and claims herein are used to distinguish between similar objects, and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of practical implementation in other than the order illustrated or other than the order described herein. Moreover, the terms "comprise", "comprising", "include", "including", and the like, are typically used herein to indicate 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.

[0038] Reference will now be made in detail to the exemplary embodiments of the present application, which are illustrated in the accompanying drawings. However, these exemplary embodiments can be implemented in various different forms, and should not be construed as being limited to only the embodiments set forth herein. It should be understood that the embodiments are provided merely to make the present disclosure complete and to fully convey the concept of the exemplary embodiments to those having ordinary skill in the art, and the same reference numerals are used to designate the same elements throughout the drawings, and thus a description thereof will be omitted.

[0039] It should be noted that, in the process of using the multimeter, improper operation may cause the selection error of the gear or the gear conversion to be not in place, which may cause the misoperation of the relay protection device or the mis-trip of the power supply and voltage air switch, affecting the safe operation of the power grid system. The cause of the misoperation is that the multimeter circuit is in a short-circuit state due to the error of the multimeter gear or the gear not being in place, thereby causing the circuit to be short-circuited to the ground when measuring the potential of the outlet to the ground or the potential of the terminal to the ground, and then causing the secondary equipment to misoperate or the related air switch to trip. The anti-misoperation device for the multimeter and the multimeter device provided by the present application are mainly used for measurement of the secondary circuit of the power system, and relate to the field of relay protection.

[0040] In combination Figures 1 to 3 In the specific embodiments of the present application, an anti-misoperation device for a multimeter is provided, which includes an anti-misoperation circuit.

[0041] Specifically, the anti-malfunction circuit comprises a safety resistor 15 and a first switch module 300, the safety resistor 15 is connected in series between the multimeter body 51 and the multimeter probe 52, and the first switch module 300 is connected in parallel with the safety resistor 15. 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 malfunction when measuring the potential of the outlet of the measuring device: ① The capacitive discharge current caused by the grounding of the measuring circuit makes the current-type relay TBJ act (generally, a current greater than 0.25 A can act), thus causing the circuit to be self-holding, thereby causing the trip to occur; ② The voltage difference caused by the grounding of the measuring circuit is applied to the voltage-type relay TJR (a voltage greater than 55% of the DC bus voltage can act, and the starting power of the relay is greater than 5 W), thus causing the circuit to act and trip. In general, limiting the current and voltage when grounding is the key to preventing malfunction. There are only two DC voltage levels, 110 V and 220 V, in the substation, and the resistance of the voltage range of the commonly used multimeter is greater than 10 MΩ, so a 10 kΩ resistor can be selected as a high-value resistor and connected in series in the measuring circuit to limit the current and voltage of the measuring circuit while basically not affecting the measured voltage (the voltage measurement accuracy is higher than 0.1%).

[0043] In combination with Figure 1 As shown in the drawings, in the present embodiment, the resistance of the safety resistor 15 is greater than or equal to 10 kΩ, 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 measuring circuit of the multimeter. When the multimeter is used normally, the anti-malfunction circuit is in a high-resistance state (i.e., the resistance of the anti-malfunction circuit is greater than or equal to 10 kΩ), and at this time, the setting of the safety resistor 15 will not affect the voltage 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 0.1 Ω), and the normal measurement of the multimeter will not be affected. Such a setting avoids the malfunction of the secondary equipment outlet in the substation caused by internal damage or incorrect selection of the measurement range of the multimeter during the measurement process, solves the problem of malfunction of the secondary equipment outlet in the substation caused by internal damage or incorrect selection of the measurement range of the multimeter during the use of the multimeter in the prior art, and improves the practicability of the anti-malfunction device.

[0044] Further, the first switch module 300 can comprise one switch or multiple switches. In an embodiment of the present application, the first switch module 300 comprises one switch, and when the switch is closed, the first switch module 300 is in a closed state, and the anti-malfunction circuit is in a zero-resistance state; when the switch is open, the first switch module 300 is in an open state, and the anti-malfunction 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 all the plurality of switches are closed, the first switch module 300 is in the closed state, when at least one of the plurality of switches is open, the first switch module 300 is in the open state. In this way, the high resistance state of the anti-misoperation circuit can be switched to the zero resistance state by simultaneously closing the plurality of switches, avoiding the state switching of the anti-misoperation circuit caused by the misoperation (closure) of the switch, causing the secondary equipment outlet in the substation to misoperate, and improving the stability of the anti-misoperation device.

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

[0047] Further, the anti-misoperation circuit further includes an indicator lamp circuit 40, the indicator lamp circuit 40 at least includes an indicator lamp 41 and an indicator lamp power supply 42 arranged in series; wherein the second switch module 60 is further arranged on the indicator lamp circuit 40, the second switch module 60 is arranged synchronously with the state of the first switch module 300, when the second switch module 60 is in the closed state, the indicator lamp 41 is in the first display state, when the second switch module 60 is in the open state, the indicator lamp 41 is in the second display state.

[0048] In this embodiment, the second switch module 60 is arranged synchronously with the state of the first switch module 300, which can realize the display of different working states of the anti-misoperation circuit through the display state of the indicator lamp 41. When the conventional multimeter is used, the first switch module 300 is in the open state, the second switch module 60 is in the open state, the anti-misoperation circuit is in the high resistance state, at this time the indicator lamp 41 is in the first display state, wherein the first display state can include the extinguishing state and the first brightness constant state; when the current, resistance or on-off file 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 less than 0.1Ω), at this time the indicator lamp 41 is in the second display state, the second display state includes the second brightness flashing state and the second brightness constant state, to prompt the measurer that the anti-misoperation circuit is in the zero resistance state at this time. Wherein, the first brightness is less than the second brightness. In a specific embodiment of the present application, the first brightness is a relatively dark brightness, and the second brightness is a relatively bright brightness or a bright state, so as to prompt the operator when the anti-misoperation circuit is in the zero resistance state.

[0049] Further, the first switch module 300 comprises the first switch 310 and the second switch 320 arranged in series, and the second switch module 60 comprises the third switch 61 and the fourth switch 62 arranged in series, wherein the third switch 61 is arranged in state synchronization with the first switch 310, and the fourth switch 62 is arranged in state synchronization with the second switch 320, so that the anti-misoperation circuit and the indicator lamp loop 40 are linked, the control process is more convenient, and the convenience of the anti-misoperation device is improved.

[0050] In the embodiment, when the multimeter is used normally, at least one of the first switch 310 and the second switch 320 is in an open state, at least one of the third switch 61 and the fourth switch 62 is in an open state, the anti-misoperation circuit is in a high resistance state, and the indicator lamp 41 is in a first display state, wherein the first display state can include an extinguished state and a dimmed always-on state; when the current range, the resistance range or the on-off range of the multimeter is used, the first switch 310 and the second switch 320 are both in a closed state, the third switch 61 and the fourth switch 62 are both in a closed state, the anti-misoperation circuit is in a zero resistance state (the resistance is less than 0.1Ω), and the indicator lamp 41 is in a second display state, wherein the second display state includes a second brightness flashing state and a second brightness always-on state, so as to prompt the measurer that the anti-misoperation circuit is in a zero resistance state at this time, and the safety of the anti-misoperation device is improved.

[0051] In combination Figure 1As shown, the indicator lamp circuit 40 comprises the indicator lamp 41, the indicator lamp power supply 42, the first resistor 43 and the second resistor 44 arranged in series, wherein the indicator lamp 41, the indicator lamp 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. The resistance of the first resistor 43 can be 200-400Ω, and the resistance 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, and the resistance of the second resistor 44 is 5.1kΩ. When the third switch 61 is open, no current flows in the indicator lamp circuit 40, and the indicator lamp 41 is in the off state in the first display state. When the third switch 61 is closed and the fourth switch 62 is open, the indicator lamp 41, the indicator lamp power supply 42, the first resistor 43 and the second resistor 44 are arranged in series, and the resistance in the indicator lamp circuit 40 is 5.4kΩ at this time. The indicator lamp 41 is in the dimmed always-on state in the first display state. When the third switch 61 and the fourth switch 62 are both closed, the indicator lamp 41, the indicator lamp power supply 42 and the first resistor 43 are arranged in series, and the second resistor 44 is short-circuited by the fourth switch 62. The resistance in the indicator lamp circuit 40 is 300Ω at this time. The indicator lamp 41 is in the bright flashing state in the second display state. Since the third switch 61 is arranged synchronously with the first switch 310, and the fourth switch 62 is arranged synchronously with the second switch 320, the measurer can directly observe the different working states of the anti-misoperation circuit through the display state of the indicator lamp 41, thereby reducing the safety hazards in the measurement process.

[0052] In combination Figure 2 and Figure 3 As shown, the anti-misoperation device comprises the base 10, the sliding cover 20 and the control assembly 30. The base 10 comprises the base body 11 and the connecting segment arranged in sequence along a preset direction, wherein the safety resistor 15 is arranged in the base body 11. At least part of the control assembly 30 is arranged on the connecting segment, and the control assembly 30 is at least used for controlling the state switching of the first switch module 300. At least part of the connecting segment extends into the sliding cover 20. The sliding cover 20 is movably arranged with the base 10 along the preset direction, so that the sliding cover 20 has the first working position (as shown in Figure 2 ) covering the control assembly 30 arranged on the connecting segment and the second working position (as shown in Figure 3 ) exposing at least part of the control assembly 30 arranged on the connecting segment.

[0053] In the conventional use of the multimeter, the slide cover 20 is located in the first working position, the control assembly 30 controls the first switch module 300 to be in the open state, and the anti-misoperation circuit is in the high resistance state; when the current, resistance or on-off scale of the multimeter is used, the slide cover 20 is first moved to the second working position, and then the control assembly 30 controls the first switch module 300 to be in the closed state, and the anti-misoperation circuit is in the zero resistance state (the resistance is less than 0.1Ω). By setting the high resistance state of the anti-misoperation circuit to the zero resistance state through two steps (first moving the slide cover 20 to the second working position, and then controlling the first switch module 300 to be in the closed state through the control assembly 30), the misoperation caused by the state switching of the anti-misoperation circuit due to the misoperation of the control assembly 30 controlling the first switch module 300 can be avoided, and the misoperation of the outlet of the secondary equipment in the substation can be avoided.

[0054] Further, 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 assembly 30 includes a contact pole assembly 31 and a control button 32, the control button 32 is arranged on the first connecting section 12, and the control button 32 is used to control the state switching of the fourth switch 62 and the second switch 320; the contact pole assembly 31 includes a first contact pole 311 arranged in the slide cover 20 and a second contact pole 312 arranged on the second connecting section 13, the first contact pole 311 is located between the second contact pole 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 the closed state, and when the first contact pole 311 is separated from the second contact pole 312, the third switch 61 and the first switch 310 are in the open state; wherein, when the slide cover 20 is in the first working position, the control button 32 is located in the slide cover 20, and the first contact pole 311 is separated from the second contact pole 312, and when the slide cover 20 is in the second working position, the control button 32 is located outside the slide 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-misoperation device.

[0055] In combination Figure 2 As shown, in the conventional use of the multimeter, the slide cover 20 is located in the first working position, the control button 32 is located in the slide cover 20, the first contact pole 311 is separated from the second contact pole 312, the first switch 310 and the third switch 61 are both open, the control button 32 controls the fourth switch 62 and the second switch 320 to be both open, the anti-misoperation circuit is in the high resistance state, and the indicator light 41 is in the extinguished state in the first display state.

[0056] In combination Figure 3As shown, when the current, resistance or continuity of the multimeter is used, the sliding cover 20 is moved to the second working position, and the control button 32 is located outside the sliding cover 20, at this time, the first contact pole 311 is in contact with the second contact pole 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 both open, the anti-misoperation circuit is still in the high resistance state, and the indicator lamp 41 is in the dim constant state in the first display state.

[0057] In combination Figure 3 Figure 3 As shown, when the current, resistance or continuity of the multimeter is used, the sliding cover 20 is moved to the second working position, and the control button 32 is located outside the sliding cover 20, at this time, the first contact pole 311 is in contact with the second contact pole 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 both open, the anti-misoperation circuit is still in the high resistance state, and the indicator lamp 41 is in the dim constant state in the first display state.

[0058] Further, the sliding cover 20 is further provided with an elastic member 14, one end of the elastic member 14 is connected with the first connecting segment 12, and the other end of the elastic member 14 is connected with the inner wall of the sliding cover 20 away from the base body 11. When the sliding cover 20 is from the first working position, the elastic member 14 is in the initial state, and when a force is applied to move the sliding cover 20 from the first working position to the second working position, the elastic member 14 is in the stretched state, when the force applied to the sliding cover 20 disappears, the elastic member 14 generates the elastic force from the stretched state to the initial state, and further drives the sliding cover 20 to move from the second working position to the first working position, so as to reset the sliding cover 20 and cover the control assembly 30 (at this time, the control assembly 30 is completely in the sliding cover 20), avoid the misoperation caused by the exposure of the control assembly 30 outside the sliding cover 20, and reduce the security risks.

[0059] In another embodiment of the present application, a multimeter device is also provided, which comprises a multimeter and an anti-misoperation device.

[0060] Specifically, the anti-malfunction circuit comprises a safety resistor 15 and a first switch module 300, the safety resistor 15 is connected in series between the multimeter body 51 and the multimeter probe 52, the first switch module 300 is connected in parallel with the safety resistor 15, when the first switch module 300 is in a closed state, the anti-malfunction circuit is in a zero resistance state, when the first switch module 300 is in an open state, the anti-malfunction circuit is in a high resistance state. In this way, the secondary equipment outlet malfunction in the transformer substation caused by the internal damage of the multimeter or the wrong selection of the measurement range during the measurement process is avoided, the problem that the secondary equipment outlet in the transformer substation is malfunctioned due to the internal damage of the multimeter or the wrong selection of the measurement range during the use of the multimeter in the prior art is solved, and the practicability of the anti-malfunction device is improved.

[0061] In another embodiment of the present application, a measurement method of a multimeter device is also provided, the measurement method is performed by using the multimeter device, and the measurement method comprises the following steps:

[0062] 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, in this way, the safety resistor 15 is connected in series between the multimeter body 51 and the multimeter probe 52, so as to limit the current and voltage in the multimeter measurement circuit.

[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, in this way, the safety resistor 15 is connected in series between the multimeter body 51 and the multimeter probe 52, so as to limit the current and voltage in the multimeter measurement circuit.

[0064] In step S2, the measurement target of the to-be-detected object is obtained, and the measurement target comprises at least one of the following: DC voltage, DC current, AC voltage and AC resistance.

[0065] In step S3, the target working state of the anti-malfunction device is determined based on the measurement target, and the target working state comprises at least one of the following: high resistance state and zero resistance state.

[0066] In step S4, 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.

[0067] In step S5, the multimeter probe is contacted with the to-be-detected object, and the measurement result is obtained.

[0068] In the above steps, the anti-malfunction device is connected in series in the lead wire where the measurement probe of the multimeter is located, the anti-malfunction device is adjusted to the target working state according to the measurement target of the to-be-detected object, the multimeter probe is contacted with the to-be-detected object, and the measurement result is obtained, so that the secondary equipment outlet malfunction in the transformer substation caused by the internal damage of the multimeter or the wrong selection of the measurement range during the measurement process is avoided, and safe measurement is achieved.

[0069] Optionally, based on the measurement target, the target working state of the anti-misoperation device is determined, including the following steps:

[0070] Step S31: 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, continuity gear, capacitance gear, diode gear and triode 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, diode and triode, etc. The selection of the target gear depends on the physical quantity to be measured.

[0072] Step S32: in the case where the target gear is determined to be any one of the current gear, the resistance gear or the continuity gear, the target working state of the anti-misoperation device is determined to be the zero resistance state.

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

[0074] Step S33: in the case where the target gear is determined to be the voltage gear, the target working state of the anti-misoperation device is determined to be the high resistance state.

[0075] In step S33, if the determined target gear is the voltage gear, the target working state of the anti-misoperation device is set to the high resistance state, which is 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-misoperation device can automatically adjust its working state according to the measurement target, thereby improving the accuracy and safety of measurement.

[0077] Further, in the case where the target working state of the anti-misoperation device is determined to be the zero resistance state, a control instruction set is generated based on the target working state, the control instruction set being used to adjust the anti-misoperation device to the target working state, including the following steps:

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

[0079] In step S41, the sliding cover 20 is moved to the second working position in the direction away from the base body, the first contact pole 311 is in contact with 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 sliding cover 20, the control button 32 is switched to the pressed state, the fourth switch 62 and the second switch 320 are both closed, the anti-misoperation circuit is in the zero resistance state, and the indicator lamp 41 is in the brighter flashing state in the second display state. Wherein, the movement of the control sliding cover to the second working position in the direction away from the base body can be achieved by manual operation or by program control, and the state switching of the control button can be achieved by manual operation or by program control.

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

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

[0082] In step S42, the control button is switched to the initial state, the fourth switch 62 and the second switch 320 are both disconnected, the anti-misoperation circuit is in the high resistance state, and if the sliding cover is located in the first working position at this time, the first switch 310 and the third switch 61 are both disconnected, and the indicator lamp 41 is in the extinguished 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 the direction close to the base body.

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

[0085] Wherein, the adjustment of the anti-misoperation device to the high resistance state can be achieved by at least one of step S42 and step S43. The default working state of the anti-misoperation device is the high resistance state, and the zero resistance state can be switched in specific occasions, but it needs to be manually or program-controlled to remain in the zero resistance state, otherwise it will return to the high resistance state.

[0086] From the above description, it can be seen that the above-mentioned 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, 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-misoperation circuit is in a high resistance state, and 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-misoperation circuit is in a zero resistance state (the resistance is less than 0.1Ω), and will not affect the normal measurement of the multimeter. Such a setting avoids the misoperation of the secondary equipment outlet in the substation caused by internal damage or incorrect selection of the measurement range of the multimeter during the measurement process, solves the problem of misoperation of the secondary equipment outlet in the substation caused by internal damage or incorrect selection of the measurement range of the multimeter during the use of the multimeter in the prior art, and improves the practicability of the anti-misoperation device.

[0088] 2. When the multimeter is used normally, the anti-misoperation circuit is in a high resistance state, and in special cases, the anti-misoperation circuit can be switched to a zero resistance state, but it needs to be manually or programmed to remain in the zero resistance state, otherwise it will return to the high resistance state (i.e. the high resistance state is the default working state), thereby preventing the misoperation or mis-trip of the relay protection device or secondary circuit caused by short circuit during the use of the multimeter.

[0089] For the sake of description, spatial relative terms such as "above", "upper", "top", "up", and the like, can be used herein for ease of description to describe the spatial relationship between one device or feature and another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" the other device or structure will be positioned "below" or "below" the other device or structure. 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 spatial relative descriptions used herein are interpreted accordingly.

[0090] In addition, it needs to be explained that "one embodiment", "another embodiment", "embodiment" and the like mentioned in the specification refer to the specific features, structures or characteristics described in connection with the embodiment, which are included in at least one embodiment described in the general description of the application. The same expression appearing in several places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in connection with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in connection with other embodiments also falls within the scope of the application.

[0091] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0092] The above only describes the preferred embodiments of the application and is not intended to limit the application. The application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

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

[0094] In the several embodiments provided by the present application, it should be understood that the disclosed technology can be implemented in other ways. Of course, the embodiment described above is only illustrative, and the division of the units can be a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, unit or module, which can be electrical or other forms.

[0095] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed on multiple units. Part or all of the units can be selected to achieve the purpose of the embodiment scheme according to actual needs.

[0096] In addition, the functional units in each embodiment of the application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0097] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or say the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0098] The above is only the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A misoperation preventing device for a multimeter, characterized by comprising: The anti-misoperation circuit comprises: A safety resistor (15) connected in series between a multimeter body (51) and a multimeter probe (52); A first switch module (300) connected in parallel with the safety resistor (15), wherein when the first switch module (300) is in a closed state, the anti-misoperation circuit is in a zero resistance state, and when the first switch module (300) is in an open state, the anti-misoperation circuit is in a high resistance state; A base (10) comprising a base body (11) and a connecting section arranged in sequence along a preset direction, wherein the connecting section comprises a second connecting section (13); A sliding cover (20) having a first working position and a second working position; An indicator light circuit (40) provided with a second switch module (60), wherein the first switch module (300) comprises a first switch (310), and the second switch module (60) comprises a third switch (61); A control assembly (30) comprising a control button (32) and a contact pole assembly (31), wherein the contact pole assembly (31) comprises a first contact pole (311) arranged in the sliding cover (20) and a second contact pole (312) arranged on the second connecting section (13), the first contact pole (311) is located between the second contact pole (312) and the base body (11), when the first contact pole (311) is in contact with 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) is separated from the second contact pole (312), 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 in the sliding cover (20), and the first contact pole (311) is separated from the second contact pole (312), 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) is in contact with the second contact pole (312).

2. The misoperation prevention device according to claim 1, characterized by The anti-misoperation circuit further comprises: The indicator light circuit (40) comprises at least an indicator light (41) and an indicator light power supply (42) connected in series; The second switch module (60) is synchronously arranged with the first switch module (300), wherein 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 misoperation prevention device according to claim 2, characterized by The first switch module (300) comprises the first switch (310) and the second switch (320) arranged in series, and the second switch module (60) comprises the third switch (61) and the fourth switch (62) arranged in series, wherein the third switch (61) is arranged in a state synchronous manner with the first switch (310), and the fourth switch (62) is arranged in a state synchronous manner with the second switch (320).

4. The misoperation prevention device according to claim 3, characterized by The anti-misoperation device comprises: The base body (11) is provided with the safety resistor (15); At least part of the control assembly (30) is arranged on the connecting section, and the control assembly (30) is used at least for controlling state switching of the first switch module (300); At least part of the connecting section extends into the sliding cover (20), and the sliding cover (20) is movably arranged along the preset direction with respect to the base (10) so that the sliding cover (20) has the first working position of covering the control assembly (30) arranged on the connecting section and the second working position of exposing at least part of the control assembly (30) arranged on the connecting section.

5. The misoperation prevention device according to claim 4, wherein The connecting section comprises a first connecting section (12) close to the base body (11) and a second connecting section (13) away from the base body (11), and the control assembly (30) comprises: The control button (32) is arranged on the first connecting section (12), and the control button (32) is used for controlling state switching of the fourth switch (62) and the second switch (320).

6. The misoperation prevention device according to claim 5, wherein The sliding cover (20) is further provided with an elastic member (14), one end of the elastic member (14) is connected with the first connecting section (12), and the other end of the elastic member (14) is connected with an inner wall of the sliding cover (20) away from the base body (11).

7. A multimeter device comprising a multimeter and a misoperation prevention device, characterized by comprising: The anti-misoperation device is the anti-misoperation device according to any one of claims 1 to 6.

8. A measurement method of a multimeter device, characterized by, The measuring method is performed by using the multimeter device according to claim 7, and the measuring method comprises: The anti-misoperation device is connected in series to a lead wire where any measuring probe of the multimeter is located; A measurement target of a to-be-detected member is acquired, wherein the measurement target comprises at least one of the following: a direct-current voltage, a direct-current current, an alternating-current voltage, and an alternating-current resistance; Based on the measurement target, a target working state of the anti-misoperation device is determined, and the target working state comprises at least one of the following: a high-resistance value state and a zero-resistance value state; Based on the target working state, a control instruction set is generated, and the control instruction set is used for adjusting the anti-misoperation device to the target working state; The multimeter probe is contacted with the to-be-detected member, and a measurement result is acquired.

9. The measurement method according to claim 8, characterized in that, Based on the measurement target, the target working state of the anti-misoperation device is determined, comprising the following steps: According to the measurement target, a target gear of the multimeter is determined, and the target gear comprises at least one of the following: a voltage gear, a current gear, a resistance gear, a on-off gear, a capacitor gear, a diode gear, and a triode gear; In a case where it is determined that the target gear is any one of a current gear, a resistance gear or a on-off gear, it is determined that the target working state of the anti-misoperation device is the zero resistance state; In a case where it is determined that the target gear is a voltage gear, it is determined that the target working state of the anti-misoperation device is the high resistance state.

10. The measurement method according to claim 8, characterized by, In a case where it is determined that the target working state of the anti-misoperation device is the zero resistance state, a control instruction set is generated based on the target working state, the control instruction set being used to adjust the anti-misoperation device to the target working state, comprising the following steps: A first control instruction in the control instruction set is generated based on the zero resistance state, the first control instruction being 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 pressing state.

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