Inflatable insulation measuring tape and insulation verification method thereof

Abstract

The invention discloses an inflatable insulating tape, and belongs to the technical field of electric power measurement electrical safety tools, the inflatable insulating tape comprises a shell, the shell is internally provided with a closed air chamber, the closed air chamber is internally provided with an inflatable insulating tape which can be telescopically rolled, and the inflatable insulating tape is arranged in the closed air chamber. A hollow inflation channel extending in the length direction of the inflation insulation ruler tape is arranged in the inflation insulation ruler tape, a gas path system is arranged in the shell and used for inflating insulation gas into the closed gas chamber or the hollow inflation channel, and the shell is fixedly connected with an insulation verification module. And the insulation verification module is used for carrying out real-time detection and verification on the insulation performance of the inflatable insulation tape. According to the invention, the gas circuit system and the verification module are highly integrated in the measuring tape shell, the product integration degree is high, the measuring tape is convenient to carry and operate with one hand, the measuring tape is very suitable for field operation requirements in the fields of electric power, electricity and the like, operators are prevented from being in danger under the condition of insulation failure, and passive protection is changed into active early warning.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric power measurement electrical safety tools, and particularly relates to an inflatable insulating tape measure and an insulating verification method thereof. BACKGROUND

[0002] In power system operation and maintenance, substation maintenance and high-voltage equipment installation, distance measurement is often needed in a live or adjacent live equipment environment. The traditional steel tape is conductive, which has a great risk of electric shock and short circuit, seriously threatening the safety of operators and equipment. Patent publication No. CN119845113A discloses a power insulating tape measure, which comprises an insulating tape, an opening mechanism and a shell body formed by tightly connecting a first shell and a second shell. The insulating tape is wound inside the shell body. One side of the shell body is provided with an opening. The movable end of the insulating tape is directed outward from the opening. The opening mechanism comprises a rotation limiting device and a limiting switch device. The rotation limiting device comprises a rotating rod and a first functional gear. The limiting switch device comprises a limiting shell, a first clamping plate, an elastic component, a connecting rod, a second clamping plate and a second functional gear. The first functional gear is fixedly sleeved on the rotating rod. The rotating rod is used to control the second shell to open / close by rotating. The insulating tape measure disclosed in the above patent has the following defects: first, its insulating performance completely depends on the performance of the solid insulating material and the surface state. In a complex field environment such as humidity and dirt, the insulating performance will decrease sharply and it is difficult to judge intuitively. Second, once the solid insulation is cracked or broken down due to wear and tear or aging, its insulating performance will be permanently lost. Therefore, a device that can be integrated with the tape measure and can realize real-time and online insulating performance verification is needed. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art and provide an inflatable insulating tape measure and an insulating verification method thereof, which solve the technical problems in the background.

[0004] The purpose of the present application is achieved in that: an inflatable insulation tape measure, comprising a shell, the inside of the shell is provided with a sealed air chamber, the inside of the sealed air chamber is provided with an inflatable insulation tape band which can be retracted, the inside of the inflatable insulation tape band is provided with a hollow inflatable channel extending along the length direction thereof, the inside of the shell is provided with an air path system for filling the sealed air chamber or the hollow inflatable channel with insulation gas, the shell is fixedly connected with an insulation verification module for real-time detection and verification of the insulation performance of the inflatable insulation tape band. By filling the sealed air chamber of the tape measure shell and / or the inflatable channel inside the tape band with insulation gas (such as dry air, SF6, N2, etc.), a gas insulation barrier which can be actively established, has good fluidity and can be self-recovered after breakdown is added on the basis of the traditional solid insulation (outer layer of the tape band). When in use, before measurement, the air path system is started to fill the insulation gas into the specified space. The insulation verification module is started, which automatically establishes a test loop between the conductive layer of the tape band and the external environment (reference ground), applies a safe test voltage, and detects a weak leakage current, so as to calculate the insulation resistance and judge whether the insulation state meets the standard in real time. The pain point of the traditional insulation tool that the insulation performance is unknown is solved, and the user can quickly confirm whether the tool is safe and reliable before use.

[0005] Further, the inflatable insulation tape band comprises: a flexible insulation outer layer; a metal tape band layer: which is arranged on the inner side of the flexible insulation outer layer, a plurality of hollow structures are arranged on the metal tape band layer, and the hollow inflatable channel is formed by the flexible insulation outer layer and the metal tape band layer. Under the premise of ensuring the flexibility, retractability and measurement function of the tape band, the metal tape band layer provides strength, rigidity and measurement reference, the flexible insulation outer layer provides primary sealing and insulation, and the hollow structure reduces weight and facilitates bending. The two are jointly enclosed to form a continuous channel which can be used as an "air pipe". When manufacturing, a strip-shaped metal layer (such as special steel) is processed to have a dense hollow mesh, and high-performance engineering plastic films are compounded on the upper and lower surfaces thereof, and heat sealing or high-frequency welding is performed along the two side edges to form a closed inflatable flat tubular structure, which is finally retracted in the shell. The hollow design makes the metal tape band maintain necessary flexibility, ensuring that it can be smoothly pulled out and retracted like a common tape measure, the gas flows uniformly in the channel, and the insulation effect is stable.

[0006] Further, the gas path system comprises: a gas pump arranged in the housing; a gas storage unit for storing insulating gas, connected with the inlet of the gas pump; a gas pressure regulating valve connected with the outlet of the gas pump, and the outlet of the gas pressure regulating valve is communicated with the closed gas chamber and the hollow gas-filled channel through gas guide pipes. In use, the user presses the gas filling button, and the control unit starts the gas pump to draw gas from the gas storage unit (such as a small high-pressure gas tank or a rechargeable gas chamber), accurately controls the output pressure through the gas pressure regulating valve, and then fills the inside of the housing and the inside of the ruler through the gas guide pipes through the three-way distribution element, until the gas pressure sensor feedback reaches the preset value and stops. Through the gas pressure regulating valve and the sensor, the insulating gas pressure can be accurately controlled to ensure stable and reliable insulation performance and avoid overpressure damage to the ruler or underpressure leading to insulation failure.

[0007] Further, the insulation verification module comprises: a program-controlled high-voltage power supply for generating a test voltage; a micro-current detection unit for detecting the leakage current flowing through the gas-filled insulating ruler; and a control processing unit electrically connected with the program-controlled high-voltage power supply and the micro-current detection unit, and the control processing unit is configured to calculate the insulation resistance value based on the leakage current and determine whether it is lower than a preset safety threshold. The program-controlled high-voltage power supply simulates a safe and adjustable test condition (such as 500V or 1000V DC), the micro-current detection unit acts as a "sensitive eye" to capture the weak leakage current signal of nA or even pA level, and the control processing unit is the "brain" which calculates the insulation resistance according to Ohm's law (R=U / I) and compares it with the preset safety threshold (such as 100MΩ) to make a pass / fail judgment without manual reading or judgment, thereby reducing the use threshold and human error risk.

[0008] Further, the micro-current detection unit is a composite measurement circuit combining the electrostatic meter method based on integrating capacitor and the feedback resistance method for measuring the leakage current of pA level and above. The integrating capacitor method is suitable for measuring extremely weak and slowly changing current, and the current is inferred by measuring the voltage change rate on the capacitor, which has extremely high sensitivity. The feedback resistance method (such as transimpedance amplifier) has a wider dynamic range and faster response speed. The combination of the two can balance the pA level ultra-high sensitivity and the relatively large range, ensuring that both excellent insulation state (extremely small current) and near failure state (increased current) can be accurately measured. The accuracy level of the insulation test is improved, so that the verification result has high credibility.

[0009] Further, the insulation verification module further comprises a self-correction unit, which comprises a standard current source for periodically outputting a standard signal to the micro-current detection unit to reconstruct an electrical model of the measurement system and realize self-correction of the measurement data. Any high-precision measurement system will produce drift (zero drift, gain drift) over time or with changes in the environment. The self-correction unit periodically (such as when powered on or every certain period of time) injects a known, accurate standard current signal (such as 1 pA) into the measurement input, allowing the system to measure this "known answer". The control processing unit compares the measurement result with the theoretical value, calculates the actual "gain" and "offset" errors of the current measurement system, and digitally compensates in subsequent real measurements, thereby correcting system errors and overcoming the drift problems caused by aging of electronic components, changes in temperature and humidity.

[0010] Further, the housing is further provided with: an alarm indicator, which is electrically connected with the control processing unit, and emits a warning signal when the insulation resistance value is lower than the preset safety threshold; and an air pressure sensor for monitoring the air pressure values in the closed air chamber and the hollow air-filled channel, and being electrically connected with the control processing unit. Users do not need to check the values, but can instantly determine "available" (green), "dangerous" (red) or "maintenance required" (yellow) through colors, which is suitable for safety warning needs in fast operation scenarios.

[0011] An insulation verification method of an inflatable insulation tape measure, comprising the following steps: S1, filling insulation gas into a closed air chamber of a housing or a hollow air-filled channel of an air-filled insulation tape through an air path system until the air pressure reaches a set value; S2, applying a test voltage between a metal tape layer and a reference electrode through a program-controlled high-voltage source of an insulation verification module; S3, detecting a leakage current between the metal tape layer and the reference electrode in real time through a micro-current detection unit; S4, calculating an insulation resistance value according to the leakage current and the test voltage through a control processing unit, and comparing the insulation resistance value with a preset safety threshold, and if the insulation resistance value is lower than the preset safety threshold, determining that the insulation performance is unqualified and emitting an alarm.

[0012] In step S3, a non-stationary slowly varying background current suppression algorithm is used to compensate for the leakage current, for eliminating measurement errors introduced by environmental interference.

[0013] After step S4, further comprising: S5, outputting a standard current signal through a self-correction unit to calibrate the micro-current detection unit online, for eliminating measurement system drift errors.

[0014] The beneficial effects of the present application: by filling the inside channel of the tape and the shell air chamber with insulating gas, a gas insulation barrier is established on the basis of the solid insulation layer, forming a solid and gas composite insulation system, greatly improving the overall insulation strength and reliability. Even if the outer solid insulation has a small damage, the internal gas insulation can still provide effective protection. The integrated high-precision insulation verification module can detect the insulation performance in real time and online before and after each use or during use. Once the insulation resistance is lower than the safety threshold, an alarm is immediately sent to prevent workers from using in the case of insulation failure, changing passive protection to active early warning. The gas path system and verification module are highly integrated in the tape shell, the product has high integration, is easy to carry and operate with one hand, and is very suitable for on-site operation needs in the fields of power and electricity. The micro-current detection unit uses a composite measurement circuit combined with a self-correcting unit to achieve stable measurement of pA-level weak current. Through self-correction and advanced digital signal processing algorithms, environmental interference and system drift are effectively suppressed, ensuring the long-term accuracy and reliability of the verification results. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the main structure of the shell of the present application.

[0016] Figure 2 is the top view of the shell of the present application.

[0017] Figure 3 is the bottom view of the shell of the present application.

[0018] Figure 4 is the internal structure of the shell of the present application.

[0019] In the figure: 1 shell, 2 sealed air chamber, 3 gas-filled insulation tape, 4 hollow gas-filled channel, 5 gas path system, 6 insulation verification module. DETAILED DESCRIPTION

[0020] The present application will be further described in detail below with reference to the accompanying drawings, it should be pointed out that all the orientation words such as above, below, front, back, left and right appearing in the present application do not limit the present application, but only for more clearly explaining and interpreting the present application.

[0021] Example 1

[0022] As Figures 1-4As shown, the embodiment discloses an inflatable insulation tape measure, comprising a shell 1, the inside of the shell 1 is provided with a closed air chamber 2, the inside of the closed air chamber 2 is provided with an inflatable insulation tape 3 which can be retracted, the inside of the inflatable insulation tape 3 is provided with a hollow inflatable channel 4 extending along the length direction thereof, the inside of the shell 1 is provided with a gas circuit system 5 for inflating insulation gas into the closed air chamber 2 or the hollow inflatable channel 4, the shell 1 is fixedly connected with an insulation verification module 6 for real-time detection and verification of the insulation performance of the inflatable insulation tape 3. By inflating insulation gas (such as dry air, SF6, N2, etc.) into the closed air chamber 2 of the tape measure shell 1 and / or the inflatable channel inside the tape, on the basis of the traditional solid insulation (outer layer of the tape), a gas insulation barrier which can be actively established, has good fluidity and can be self-recovered after breakdown is added. When in use, before measurement, the gas circuit system 5 is started to inflate insulation gas into the specified space. The insulation verification module 6 is started, the module automatically establishes a test loop between the conductive layer of the tape and the external environment (reference ground), applies a safe test voltage, and detects a weak leakage current, so as to calculate the insulation resistance and judge whether the insulation state meets the standard in real time. The pain point of the traditional insulation tool "unknown insulation performance" is solved, and the user can quickly confirm whether the tool is safe and reliable before use.

[0023] In the embodiment, the inflatable insulation tape 3 comprises: a flexible insulation outer layer; a metal tape layer: which is arranged on the inside of the flexible insulation outer layer, a plurality of hollow structures are arranged on the metal tape layer, and the hollow inflatable channel 4 is formed by the flexible insulation outer layer and the metal tape layer. Under the premise of ensuring the flexibility, retractability and measurement function of the tape, the metal tape layer provides strength, rigidity and measurement reference, the flexible insulation outer layer provides primary sealing and insulation, the hollow structure reduces weight and facilitates bending, and the two together form a continuous channel which can be used as an "air pipe". When manufacturing, a strip-shaped metal layer (such as special steel) is processed to have dense hollow mesh holes, high-performance engineering plastic films are compounded on the upper and lower surfaces thereof, and heat sealing or high-frequency welding is performed along the two side edges to form a closed inflatable flat tubular structure, and finally the structure is retracted in the shell 1. The hollow design makes the metal tape maintain necessary flexibility, ensuring that it can be smoothly pulled out and retracted like a common tape measure, the gas flows uniformly in the channel, and the insulation effect is stable.

[0024] In the embodiment, the gas path system 5 comprises: a gas pump arranged in the housing 1; a gas storage unit for storing insulating gas, connected with the inlet of the gas pump; a gas pressure regulating valve connected with the outlet of the gas pump, and the outlet of the gas pressure regulating valve is connected with the closed gas chamber 2 and the hollow gas-filled channel 4 through gas pipes respectively. In use, the user presses the gas filling button, and the control unit starts the gas pump to draw gas from the gas storage unit (such as a small high-pressure gas tank or a rechargeable gas chamber), accurately controls the output pressure through the gas pressure regulating valve, and then fills the inside of the housing 1 and the inside of the ruler tape through the three-way distribution element and the gas pipes simultaneously until the gas pressure sensor feedback reaches the preset value and stops. Through the gas pressure regulating valve and the sensor, the insulating gas pressure can be accurately controlled to ensure stable and reliable insulation performance and avoid overpressure damage to the ruler tape or underpressure leading to insulation failure.

[0025] In the embodiment, the insulation verification module 6 comprises: a program-controlled high-voltage power supply for generating a test voltage; a micro-current detection unit for detecting the leakage current flowing through the gas-filled insulating ruler tape 3; and a control processing unit electrically connected with the program-controlled high-voltage power supply and the micro-current detection unit, and the control processing unit is configured to calculate the insulation resistance value based on the leakage current and determine whether it is lower than a preset safety threshold. The program-controlled high-voltage power supply simulates a safe and adjustable test condition (such as 500V or 1000V DC), the micro-current detection unit acts as a "sensitive eye" to capture the weak leakage current signal of nA or even pA level, and the control processing unit is the "brain" to calculate the insulation resistance according to Ohm's law (R=U / I) and compare it with the preset safety threshold (such as 100MΩ) to make a pass / fail judgment without manual reading or judgment, thereby reducing the use threshold and human error risk.

[0026] In the embodiment, the micro-current detection unit is a composite measurement circuit combining the electrostatic meter method based on integrating capacitor and the feedback resistance method for measuring the leakage current of pA level and above. The integrating capacitor method is suitable for measuring extremely weak and slowly changing current, and the current is inferred by measuring the voltage change rate on the capacitor, which has extremely high sensitivity. The feedback resistance method (such as transimpedance amplifier) has a wider dynamic range and faster response speed. The combination of the two can balance the pA level ultra-high sensitivity and the relatively large range, ensuring that both excellent insulation state (extremely small current) and near failure state (increased current) can be accurately measured. The accuracy level of the insulation test is improved, thereby making the verification result highly reliable.

[0027] Embodiment 2

[0028] As Figures 1-4As shown, in this embodiment, on the basis of Embodiment 1, the insulation verification module 6 further comprises a self-correction unit, which comprises: a standard current source for periodically outputting a standard signal to the micro-current detection unit to reconstruct the electrical model of the measurement system and realize self-correction of the measurement data. Any high-precision measurement system will produce drift (zero drift, gain drift) over time or with environmental changes. The self-correction unit periodically (such as when powered on or every certain period of time) injects a known, accurate standard current signal (such as 1 pA) into the measurement input, allowing the system to measure this "known answer". The control processing unit compares the measurement result with the theoretical value, calculates the actual "gain" and "offset" errors of the current measurement system, and digitally compensates in subsequent real measurements, thereby correcting system errors and overcoming the drift problems caused by electronic component aging and temperature and humidity changes.

[0029] In this embodiment, the housing 1 is further provided with: an alarm indicator, which is electrically connected with the control processing unit and emits a warning signal when the insulation resistance value is lower than the preset safety threshold; and an air pressure sensor for monitoring the air pressure values in the closed air chamber 2 and the hollow air-filled channel 4 and being electrically connected with the control processing unit. Users do not need to check the values and can instantly determine "available" (green), "dangerous" (red), or "maintenance required" (yellow) through colors, which is suitable for safety warning needs in fast operation scenarios.

[0030] In this embodiment, a kind of insulation verification method of inflatable insulation tape measure is disclosed, comprising the following steps: S1, through air path system 5, the closed air chamber 2 of housing 1 or the hollow air-filled channel 4 of inflatable insulation tape 3 is filled with insulation gas, until the air pressure reaches the set value;S2, the program-controlled high-voltage source of insulation verification module 6 applies test voltage between metal tape layer and a reference electrode;S3, the leakage current between metal tape layer and reference electrode is detected in real time by micro-current detection unit;S4, the control processing unit calculates the insulation resistance value according to the leakage current and test voltage, and compares with the preset safety threshold, if the insulation resistance value is lower than the preset safety threshold, it is determined that the insulation performance is unqualified and an alarm is issued.

[0031] In step S3, a non-stationary slowly varying background current suppression algorithm is used to compensate for the leakage current, which is used to eliminate the measurement error introduced by environmental interference.

[0032] After step S4, further comprising: S5, output a standard current signal by the self-correction unit to calibrate the micro-current detection unit online, for eliminating the drift error of the measurement system.

[0033] In implementation, the inflatable insulating tape 3 is telescopically wound in the sealed air chamber 2. The inflatable insulating tape 3 comprises, from outside to inside, a flexible insulating outer layer (e.g. a high-strength engineering plastic film) and a metal tape layer (e.g. a corrosion-treated steel tape). The metal tape layer is regularly provided with a plurality of hollow structures, which not only reduce the weight but also make the tape have good bending property. The flexible insulating outer layer and the metal tape layer are combined by heat pressing or adhesion, and the edges on both sides are sealed, so as to form a hollow air channel 4 extending along the length direction of the tape between the two layers. The air pump draws insulating gas from the gas storage unit, and after the pressure is stabilized by the regulating valve, the insulating gas is filled into the sealed air chamber 2 of the housing 1 and the hollow air channel 4 of the tape through the air guide pipe.

[0034] The insulation verification module 6 is a core intelligent unit. The program-controlled high-voltage power supply can program output DC or power frequency test voltage in the range of 0-10kV. The micro-current detection unit adopts a composite measurement circuit with high-impedance input and electromagnetic shielding, which can accurately measure the leakage current in the order of pA to nA. The control processing unit (e.g. MCU) receives the signals of the current, voltage and air pressure sensors, and calculates the insulation resistance in real time, and compares it with the preset safety threshold (e.g. 100MΩ) stored in the internal. The standard current source in the self-correcting unit can periodically inject a known pA-level standard current into the detection circuit. The MCU automatically corrects the measurement model parameters by comparing the measured value with the theoretical value, and realizes the "zero drift" calibration. The program-controlled high-voltage power supply applies a test voltage of, for example, 5kV between the metal tape layer and the grounded housing 1. The micro-current detection unit detects the leakage current I. The control processing unit calculates the insulation resistance R according to Ohm's law R=U / I. If R is greater than the safety threshold, the alarm indicator shows green, indicating that the insulation performance is good and it can be used safely; if R is lower than the threshold, the alarm indicator turns red and flashes, and the buzzer alarm is triggered, prohibiting measurement operation. The entire verification process can be completed in a few seconds. In the current measurement of step S3, the control processing unit runs the "non-stationary slowly varying background current suppression algorithm", which models and adaptively filters the monitored background current noise, and subtracts it from the real-time signal, improving the accuracy of the measurement.

[0035] The present application highly integrates the air path system 5 and the verification module in the tape housing 1, has high product integration, is convenient to carry and operate with one hand, and is very suitable for the on-site operation needs in the fields of power and electricity.

[0036] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacement or change according to the technical solution and concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An inflatable insulating tape measure, comprising a housing, wherein a sealed air chamber is provided inside the housing, characterized in that, The sealed air chamber is equipped with a retractable inflatable insulating tape. The inflatable insulating tape has a hollow inflation channel extending along its length. The housing is equipped with an air passage system for filling the sealed air chamber or the hollow inflation channel with insulating gas. An insulation verification module is fixedly connected to the housing for real-time detection and verification of the insulation performance of the inflatable insulating tape.

2. The inflatable insulating tape measure according to claim 1, characterized in that, The inflatable insulating tape includes: Flexible insulating outer layer; Metal strip layer: It is attached to the inner side of the flexible insulating outer layer. The metal strip layer has multiple hollow structures. The hollow air-filling channel is formed by the flexible insulating outer layer and the metal strip layer.

3. The inflatable insulating tape measure according to claim 2, characterized in that, The gas path system includes: Air pump: located inside the housing; Gas storage unit: used to store insulating gas, connected to the inlet of the gas pump; Air pressure regulating valve: connected to the outlet of the air pump, and the outlet of the air pressure regulating valve is connected to the sealed air chamber and the hollow air filling channel respectively through the air guide pipe.

4. The inflatable insulating tape measure according to claim 3, characterized in that, The insulation verification module includes: Programmable high-voltage voltage source: used to generate test voltage; Microcurrent detection unit: used to detect the leakage current flowing through the inflatable insulating tape; Control processing unit: Electrically connected to the programmable high voltage source and the micro current detection unit, and the control processing unit is configured to calculate the insulation resistance value based on the leakage current and determine whether it is lower than the preset safety threshold.

5. The inflatable insulating tape measure according to claim 4, characterized in that, The microcurrent detection unit is a composite measurement circuit combining the electrometer method based on integrating capacitance and the feedback resistance method, used to measure leakage currents of pA level and above.

6. The inflatable insulating tape measure according to claim 4, characterized in that, The insulation verification module further includes a self-calibration unit, which includes: A standard current source is used to periodically output a standard signal to the microcurrent detection unit to reconstruct the electrical model of the measurement system and realize the self-calibration of the measurement data.

7. The inflatable insulating tape measure according to claim 4, characterized in that, The housing is also provided with: An alarm indicator light is electrically connected to the control processing unit and emits a warning signal when the insulation resistance value is lower than the preset safety threshold. A pressure sensor is used to monitor the pressure values ​​in the sealed air chamber and the hollow inflation channel, and is electrically connected to the control processing unit.

8. A method for verifying the insulation of an inflatable insulating tape measure, characterized in that, Includes the following steps: S1. Insulating gas is injected into the sealed air chamber of the shell or the hollow air inflation channel of the inflatable insulating tape through the air circuit system until the air pressure reaches the set value. S2. Apply a test voltage between the metal strip layer and a reference electrode through the programmable high voltage source of the insulation verification module. S3. The leakage current between the metal strip layer and the reference electrode is detected in real time by the micro-current detection unit; S4. The control processing unit calculates the insulation resistance value based on the leakage current and test voltage, and compares it with the preset safety threshold. If the insulation resistance value is lower than the preset safety threshold, the insulation performance is determined to be unqualified and an alarm is issued.

9. The insulation verification method for the inflatable insulating tape measure according to claim 8, characterized in that, In step S3, a non-stationary, gradually varying background current suppression algorithm is used to compensate for the leakage current, thereby eliminating measurement errors introduced by environmental interference.

10. The insulation verification method for the inflatable insulating tape measure according to claim 8, characterized in that, Following step S4, the following is also included: S5. The self-calibration unit outputs a standard current signal to calibrate the micro-current detection unit online, thereby eliminating drift errors in the measurement system.

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