Anti-interference track insulation on-line tester integrated with signal generator and method

Abstract

The invention provides an anti-interference track insulation on-line tester integrated with a signal generator and a method, and relates to the field of track insulation tests.The anti-interference track insulation on-line tester comprises a handset, a controller arranged in the handset, a signal generation assembly and an insulation resistance tester; the signal generating assembly and the insulation resistance tester are electrically connected with the controller, the controller is used for controlling the signal generating assembly to apply alternating current signals for track insulation testing to the two ends of a tested track, and the insulation resistance tester comprises a signal collecting assembly and a filtering assembly. The signal acquisition assembly is used for acquiring signals of a tested track in the process of applying alternating current signals for track insulation testing to the two ends of the tested track, and the filtering assembly is used for filtering the signals of the tested track acquired by the signal acquisition assembly. And the controller is used for calculating the insulation resistance value of the tested track according to the filtered signal of the tested track. The method has the advantage of improving the accuracy and efficiency of the track insulation online test.

Description

Technical Field

[0001] The invention relates to the field of track insulation testing, and in particular to an anti-interference track insulation online tester and method integrated with a signal generator. Background Art

[0002] Track circuits are important basic equipment for train operation safety control. Whether it works reliably and safely will directly affect the safety and efficiency of train operation, and directly affect the safety of transportation production. At present, frequent failures caused by damaged track insulation have seriously affected the safety of railway transportation. Most of the driving failures in the electrical system are caused by turnout and track circuit failures, and most of the track circuit failures are caused by insulation damage. Since the causes of track insulation damage are more complicated and difficult to find, track circuit insulation fault detection is an urgent problem that railway maintenance departments need to solve. Track insulation damage can cause track circuit failures. These insulations include: rail end insulation, turnout installation device insulation, gauge rod insulation and other track insulation.

[0003] In the prior art, multimeters or megohmmeters and the previous generation of insulation meters are mainly used to measure and estimate insulation damage. The workload is large and the test results are inaccurate. Therefore, online contact measurement to determine whether the insulation performance is good is a very important issue. In addition, the existing track insulation measurement equipment is often interfered by external factors in actual applications. These interference factors may include but are not limited to the electromagnetic environment on site, power supply fluctuations, climatic conditions, and signal interference from other electronic equipment. These external interferences not only affect the accuracy of the measurement results, but also reduce the reliability of the measurement process, and increase the difficulty and complexity of railway maintenance work.

[0004] Therefore, it is necessary to provide an anti-interference rail insulation online tester with an integrated signal generator to improve the accuracy and efficiency of the rail insulation online test. Summary of the invention

[0005] The present invention provides an anti-interference track insulation online tester with an integrated signal generator, comprising a handset, a controller arranged in the handset, a signal generating component and an insulation resistance tester, wherein the signal generating component and the insulation resistance tester are both electrically connected to the controller, wherein the controller is used to control the signal generating component to apply an AC signal for track insulation testing at both ends of the tested track, the insulation resistance tester comprises a signal acquisition component and a filtering component, the signal acquisition component is used to acquire the signal of the tested track in the process of applying the AC signal for track insulation testing at both ends of the tested track, the filtering component performs filtering processing on the signal of the tested track acquired by the signal acquisition component, the controller is used to calculate the insulation resistance value of the tested track according to the signal of the tested track after filtering processing, and the handset is also provided with an anti-interference component.

[0006] Furthermore, the signal generating component includes a signal generator and an operational amplifier component, wherein the signal generator is used to output a 230KHz AC square wave signal, and the operational amplifier component is used to convert the 230KHz AC square wave signal output by the signal generator into an AC signal for track insulation testing, wherein the AC signal for track insulation testing is a sinusoidal wave signal.

[0007] Further, the operational amplifier component includes a first-stage operational amplifier, a second-stage operational amplifier, a third-stage operational amplifier, a fourth-stage operational amplifier and a fifth-stage operational amplifier, wherein the output end of the signal generator is electrically connected to the inverting input end of the first-stage operational amplifier, the output end of the first-stage operational amplifier is electrically connected to the inverting input end of the second-stage operational amplifier, the output end of the second-stage operational amplifier is electrically connected to the inverting input end of the third-stage operational amplifier, the output end of the third-stage operational amplifier is electrically connected to the inverting input end of the fourth-stage operational amplifier, and the output end of the fourth-stage operational amplifier is electrically connected to the inverting input end of the fifth-stage operational amplifier.

[0008] Furthermore, the handheld device also includes a power conversion component for supplying power to the first-stage operational amplifier, the second-stage operational amplifier, the third-stage operational amplifier, the fourth-stage operational amplifier and the fifth-stage operational amplifier, the power conversion component includes a positive power conversion circuit and a negative power conversion circuit, the output end of the positive power conversion circuit is electrically connected to the positive input voltage pins of the first-stage operational amplifier, the second-stage operational amplifier, the third-stage operational amplifier, the fourth-stage operational amplifier and the fifth-stage operational amplifier, and the output end of the negative power conversion circuit is electrically connected to the negative input voltage pins of the first-stage operational amplifier, the second-stage operational amplifier, the third-stage operational amplifier, the fourth-stage operational amplifier and the fifth-stage operational amplifier.

[0009] Furthermore, the insulation resistance tester includes a voltage acquisition component and a current acquisition component, wherein the current acquisition component is used to collect the current signal of the tested track during the process of applying an AC signal for track insulation testing at both ends of the tested track, and the voltage acquisition component is used to collect the voltage signal of the tested track during the process of applying an AC signal for track insulation testing at both ends of the tested track.

[0010] Furthermore, the filtering component includes a current active bandpass filter and a voltage active bandpass filter, wherein the current active bandpass filter is used to filter the current signal, and the voltage active bandpass filter is used to filter the voltage signal.

[0011] Furthermore, the anti-interference component includes a metal shell, and the voltage collection component, current collection component and filter component are arranged in the metal shell; the anti-interference component also includes a magnetic shielding cover, a magnetic shielding cover is arranged in the metal shell, and the voltage collection component, current collection component and filter component are arranged in the magnetic shielding cover.

[0012] Furthermore, the handheld device also includes an overcurrent protector, which is connected in series between the tested track and the current collection component; the handheld device also includes an overvoltage protector, which is connected in series between the tested track and the voltage collection component.

[0013] The present invention provides an anti-interference rail insulation online test method of an integrated signal generator, which is applied to the above-mentioned anti-interference rail insulation online tester of the integrated signal generator, comprising: acquiring test data of the anti-interference rail insulation online tester of the integrated signal generator; judging whether the anti-interference rail insulation online tester of the integrated signal generator meets a preset condition according to the test data of the anti-interference rail insulation online tester of the integrated signal generator; if the anti-interference rail insulation online tester of the integrated signal generator does not meet the preset condition, calibrating the anti-interference rail insulation online tester of the integrated signal generator; if the anti-interference rail insulation online tester of the integrated signal generator meets the preset condition, connecting a signal generating component and an insulation resistance tester to a tested rail; controlling the signal generating component to apply an AC signal for rail insulation test at two ends of the tested rail by a controller; and calculating the insulation resistance value of the tested rail according to the signal of the tested rail after filtering by the controller.

[0014] Further, according to the test data of the anti-interference track insulation online tester of the integrated signal generator, judging whether the anti-interference track insulation online tester of the integrated signal generator meets the preset conditions, including: calculating the uncertainty of the anti-interference track insulation online tester of the integrated signal generator according to the test data of the anti-interference track insulation online tester of the integrated signal generator; calculating the measurement accuracy of the anti-interference track insulation online tester of the integrated signal generator according to the test data of the anti-interference track insulation online tester of the integrated signal generator; calculating the anti-interference ability of the anti-interference track insulation online tester of the integrated signal generator according to the test data of the anti-interference track insulation online tester of the integrated signal generator; calculating the environmental adaptability of the anti-interference track insulation online tester of the integrated signal generator according to the test data of the anti-interference track insulation online tester of the integrated signal generator; judging whether the anti-interference track insulation online tester of the integrated signal generator meets the preset conditions according to the uncertainty, measurement accuracy, anti-interference ability and environmental adaptability of the anti-interference track insulation online tester of the integrated signal generator.

[0015] Compared with the prior art, the anti-interference rail insulation online tester and method with integrated signal generator provided by the present invention have at least the following beneficial effects: 1. A highly integrated design concept is adopted, integrating the handheld device, signal generator and insulation resistance tester into one, which greatly simplifies the equipment structure and reduces the size. This integrated design not only reduces the overall weight and improves portability, but also makes the rail insulation online tester more convenient and quick to deploy and operate on site; due to the reduction in equipment size and weight, operators can easily move the rail insulation online tester between different measurement points, speeding up the measurement process. Easy operation: The integrated design simplifies the connection process, and operators do not need to worry about additional signal generator connection issues and can focus more on the measurement itself. Spatial adaptability: Even in space-constrained environments, such as narrow tracks or tunnels, the rail insulation online tester can be used flexibly without space restrictions. Low maintenance cost: Integration reduces external connection points and reduces the failure rate caused by connection problems, thereby reducing maintenance costs and time.

[0016] 2. The metal shell and magnetic shielding cover are set to effectively prevent the influence of signal interference, communication interference, and especially the electromagnetic interference of the high-speed rail site environment on the measurement. The anti-interference ability of the anti-interference track insulation online tester is significantly improved, ensuring the accuracy and stability of the measurement results. Even under the conditions of complex electromagnetic environment such as the high-speed rail site, the anti-interference track insulation online tester can work normally, providing a strong guarantee for railway transportation safety; the current signal is filtered by the current active bandpass filter, and the voltage signal is filtered by the voltage active bandpass filter. It effectively solves the problem of performance degradation of the existing track insulation online tester in a complex electromagnetic environment, ensures that the track insulation online tester can accurately measure the insulation resistance on various railway lines, and improves the adaptability and stability of the test. Add overcurrent protector and overvoltage protector to prevent the measuring handheld device from being impacted by external signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein: Figure 1 is a module schematic diagram of an anti-interference rail insulation online tester with an integrated signal generator according to some embodiments of this specification; Figure 2 is a schematic diagram of the structure of a handset according to some embodiments of this specification; Figure 3 is a circuit diagram of an operational amplifier assembly according to some embodiments of this specification; Figure 4 is a circuit diagram of a power conversion component according to some embodiments of this specification; Figure 5 It is a flow chart of an anti-interference rail insulation online testing method with an integrated signal generator according to some embodiments of this specification.

[0018] In the figure, 1. Handheld device; 2. Display screen; 3. Control buttons; 4. Dial. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0020] Figure 1 is a schematic diagram of a module of an anti-interference rail insulation online tester with an integrated signal generator according to some embodiments of this specification, such as Figure 1 As shown, the anti-interference track insulation online tester with integrated signal generator includes a handheld device, a controller arranged in the handheld device, a signal generating component and an insulation resistance tester, wherein the signal generating component and the insulation resistance tester are both electrically connected to the controller, wherein the controller is used to control the signal generating component to apply an AC signal for track insulation test at both ends of the tested track, the insulation resistance tester includes a signal acquisition component and a filtering component, the signal acquisition component is used to collect the signal of the tested track during the process of applying the AC signal for track insulation test at both ends of the tested track, the filtering component performs filtering processing on the signal of the tested track collected by the signal acquisition component, the controller is used to calculate the insulation resistance value of the tested track according to the signal of the tested track after filtering processing, and the handheld device is also provided with an anti-interference component.

[0021] Specifically, when the anti-interference rail insulation online tester with integrated signal generator starts working, the signal generating component will apply an AC signal to both ends of the tested rail. This signal is an AC with a specific frequency and amplitude, which is used to excite the electromagnetic field in the rail. After applying the AC signal, the insulation resistance tester will start to measure the signals at both ends of the tested rail. The controller calculates the insulation resistance value of the tested rail based on the signal of the tested rail after filtering, and finally obtains the value of the insulation resistance. This value reflects the insulation performance of the rail and is an important indicator for evaluating the safety of the rail.

[0022] Figure 2 is a schematic diagram of the structure of a handset according to some embodiments of this specification, such as Figure 2 As shown, the handheld device 1 is also provided with a display screen 2 .

[0023] Specifically, the insulation resistance values ​​at both ends of the tested track can be displayed on the display screen 2 .

[0024] The handheld device 1 is also provided with a Bluetooth component electrically connected to the controller.

[0025] Specifically, the controller can send the insulation resistance values ​​of the two ends of the tested track to the operator's mobile terminal through the Bluetooth component, and can also receive the control signal sent by the operator through the mobile terminal through the Bluetooth component to adjust the parameters and / or functions of the track insulation online tester with an integrated signal generator.

[0026] like Figure 2 As shown, the handheld device 1 is also provided with a controller ( Figure 1 (not shown) and a plurality of control buttons 3 and / or dials 4 electrically connected to the controller.

[0027] Specifically, the operator can adjust the parameters of the rail insulation online tester with integrated signal generator through multiple control buttons 3. For example, adjust the parameters of the AC signal for rail insulation test output by the signal generator. The operator can adjust the functions of the rail insulation online tester with integrated signal generator through the dial 4, such as power on, power off, USB connection, measuring the current, voltage, resistance, etc. of the tested rail.

[0028] Button Description:

Switch

[0029] [Settings]: Background function, users should not press this button.

[0030]

Backlight

[0031] Dial Description:

OFF

[0032]

Resistance

[0033]

Voltage

[0034]

Current

[0035]

USB

[0036]

Bluetooth

[0037] In some embodiments, the signal generating component includes a signal generator and an operational amplifier component, wherein the signal generator is used to output a 230KHz AC square wave signal, and the operational amplifier component is used to convert the 230KHz AC square wave signal output by the signal generator into an AC signal for track insulation testing, wherein the AC signal for track insulation testing is a sine wave signal.

[0038] Figure 3 is a circuit diagram of an operational amplifier assembly according to some embodiments of this specification, such as Figure 3As shown, in some embodiments, the operational amplifier component includes a first-stage operational amplifier UP1B, a second-stage operational amplifier UP1A, a third-stage operational amplifier UP2B, a fourth-stage operational amplifier UP2A and a fifth-stage operational amplifier UP3, wherein the output end of the signal generator is electrically connected to the inverting input end of the first-stage operational amplifier UP1B, the output end of the first-stage operational amplifier UP1B is electrically connected to the inverting input end of the second-stage operational amplifier UP1A, the output end of the second-stage operational amplifier UP1A is electrically connected to the inverting input end of the third-stage operational amplifier UP2B, the output end of the third-stage operational amplifier UP2B is electrically connected to the inverting input end of the fourth-stage operational amplifier UP2A, and the output end of the fourth-stage operational amplifier UP2A is electrically connected to the inverting input end of the fifth-stage operational amplifier UP3.

[0039] Specifically, the 230KHz AC square wave signal is converted into a sine wave signal through the operational amplifier component, and the sine wave signal is filtered to remove other clutter, making it a standard sine wave signal. Then, the operational amplifier component adjusts the amplitude of the sine wave signal to the required amplitude, and the amplified voltage signal is sent to the voltage output terminal, which is loaded to the two ends of the tested track through wiring, forming a current loop in the tested track.

[0040] Figure 4 is a circuit diagram of a power conversion component according to some embodiments of this specification, such as Figure 4 As shown, in some embodiments, the handheld device 1 further includes a power conversion component for supplying power to the first-stage operational amplifier UP1B, the second-stage operational amplifier UP1A, the third-stage operational amplifier UP2B, the fourth-stage operational amplifier UP2A and the fifth-stage operational amplifier UP3, the power conversion component includes a positive power conversion circuit and a negative power conversion circuit, the output end of the positive power conversion circuit is electrically connected to the positive input voltage pins of the first-stage operational amplifier UP1B, the second-stage operational amplifier UP1A, the third-stage operational amplifier UP2B, the fourth-stage operational amplifier UP2A and the fifth-stage operational amplifier UP3, and the output end of the negative power conversion circuit is electrically connected to the negative input voltage pins of the first-stage operational amplifier UP1B, the second-stage operational amplifier UP1A, the third-stage operational amplifier UP2B, the fourth-stage operational amplifier UP2A and the fifth-stage operational amplifier UP3. The power conversion component includes a positive power conversion circuit and a negative power conversion circuit, both of which include a TPS5430 chip.

[0041] In some embodiments, the insulation resistance tester includes a voltage acquisition component and a current acquisition component, wherein the current acquisition component is used to collect the current signal of the tested track during the process of applying an AC signal for track insulation test at both ends of the tested track, and the voltage acquisition component is used to collect the voltage signal of the tested track during the process of applying an AC signal for track insulation test at both ends of the tested track. The filter component includes a current active bandpass filter and a voltage active bandpass filter, wherein the current active bandpass filter is used to filter the current signal, and the voltage active bandpass filter is used to filter the voltage signal. The handheld device 1 also includes an overcurrent protector, which is connected in series between the tested track and the current acquisition component. The handheld device 1 also includes an overvoltage protector, which is connected in series between the tested track and the voltage acquisition component. The current acquisition component includes a Rogowski coil, which has the characteristics of real-time current measurement, fast response speed, and no saturation, and the measurement accuracy can reach up to 0.1%. It overcomes the problems of equipment damage and inaccurate measurement that may be caused by existing contact current measurement. There may be high voltage and high current track signals on the rails, so an overcurrent protector and an overvoltage protector are added to prevent the handheld device 1 from being impacted by external signals.

[0042] In some embodiments, the anti-interference component includes a metal shell, and the voltage acquisition component, the current acquisition component and the filter component are arranged in the metal shell. The anti-interference component also includes a magnetic shielding cover, and the metal shell is provided with a magnetic shielding cover, and the voltage acquisition component, the current acquisition component and the filter component are arranged in the magnetic shielding cover. By setting up the metal shell and the magnetic shielding cover, the influence of signal interference, communication interference, and especially the electromagnetic interference of the high-speed rail site environment on the measurement is effectively prevented. The anti-interference ability of the anti-interference track insulation online tester is significantly improved, ensuring the accuracy and stability of the measurement results. Even under the conditions of complex electromagnetic environment such as the high-speed rail site, the anti-interference track insulation online tester can work normally, providing a strong guarantee for railway transportation safety.

[0043] In some embodiments, the anti-interference rail insulation online tester with integrated signal generator further includes a frequency meter, the input end of which is electrically connected to the output end of the signal generating component. The frequency meter can detect the output signal frequency of the sine wave signal for rail insulation testing output by the signal generating component, and the operator can determine whether the signal generating component is faulty based on the output signal frequency of the sine wave signal for rail insulation testing output by the signal generating component.

[0044] In some embodiments, the anti-interference rail insulation online tester with integrated signal generator further includes a wireless communication component, wherein the output end of the single chip microcomputer is electrically connected to the input end of the wireless communication component. The wireless communication component can transmit the rail insulation resistance value to a mobile terminal used by an operator. The wireless communication component can use LORA (Long Range Radio) technology.

[0045] Main technical indicators of the anti-interference rail insulation online tester with integrated signal generator: Working temperature: -30℃~+55℃; Working relative humidity: no more than 93%; The output signal frequency of the sine wave signal for rail insulation test output by the signal generating component is 230KHz, and the relative deviation is not more than ±1×10 -4 ; The insulation resistance measurement range of the tested track is 5~200Ω. When the insulation resistance of the tested track is 5~120Ω, the maximum allowable error is (-5.0~0)%; when the insulation resistance of the tested track is >120Ω, the maximum allowable error is ±10.0%; Resolution: When the insulation resistance of the tested track is 0-10Ω, the resolution is 0.001Ω; when the insulation resistance of the tested track is 10-100Ω, the resolution is 0.01Ω; when the insulation resistance of the tested track is above 100Ω, the resolution is 0.1Ω.

[0046] The anti-interference rail insulation online tester with integrated signal generator can use low-temperature resistant rechargeable lithium batteries to meet the use requirements in low-temperature environments. The temperature in the northern region is extremely low in winter, and ordinary rechargeable batteries cannot meet the use requirements in low-temperature environments. In order to overcome the influence of low-temperature environments, low-temperature resistant rechargeable lithium batteries are used.

[0047] Figure 5 is a flow chart of an anti-interference rail insulation online testing method with an integrated signal generator according to some embodiments of this specification, such as Figure 5 As shown, the anti-interference rail insulation online testing method with integrated signal generator may include the following steps.

[0048] Step 510, acquiring test data of an anti-interference rail insulation online tester with an integrated signal generator; Step 520, judging whether the anti-interference rail insulation online tester with integrated signal generator meets preset conditions according to the test data of the anti-interference rail insulation online tester with integrated signal generator; Step 530, if the anti-interference rail insulation online tester with integrated signal generator does not meet the preset conditions, calibrate the anti-interference rail insulation online tester with integrated signal generator; Step 540, if the anti-interference rail insulation online tester with integrated signal generator meets the preset conditions, the signal generating component and the insulation resistance tester are connected to the tested rail; Step 550, controlling the signal generating assembly through the controller to apply an AC signal for track insulation testing to both ends of the track being tested; Step 560: The controller is used to calculate the insulation resistance of the tested track according to the signal of the tested track after filtering.

[0049] In some embodiments, judging whether the anti-interference track insulation online tester with integrated signal generator meets preset conditions according to the test data of the anti-interference track insulation online tester with integrated signal generator includes: According to the test data of the anti-interference rail insulation online tester with integrated signal generator, the uncertainty of the anti-interference rail insulation online tester with integrated signal generator is calculated; According to the test data of the anti-interference rail insulation online tester with integrated signal generator, the measurement accuracy of the anti-interference rail insulation online tester with integrated signal generator is calculated; According to the test data of the anti-interference rail insulation online tester with integrated signal generator, the anti-interference capability of the anti-interference rail insulation online tester with integrated signal generator is calculated; According to the test data of the anti-interference rail insulation online tester with integrated signal generator, the environmental adaptability of the anti-interference rail insulation online tester with integrated signal generator is calculated; According to the uncertainty, measurement accuracy, anti-interference ability and environmental adaptability of the anti-interference track insulation online tester with integrated signal generator, it is judged whether the anti-interference track insulation online tester with integrated signal generator meets the preset conditions. For example, if the uncertainty of the anti-interference track insulation online tester with integrated signal generator is greater than the uncertainty threshold, the measurement accuracy is less than the measurement accuracy threshold, the anti-interference ability is less than the preset anti-interference ability and / or the environmental adaptability is less than the preset environmental adaptability, then it is judged that the anti-interference track insulation online tester with integrated signal generator does not meet the preset conditions.

[0050] Specifically, measurement accuracy test: Use a precision resistance box to set different resistance values ​​(5Ω, 50Ω, 100Ω, 200Ω, etc.), use an anti-interference rail insulation online tester with an integrated signal generator to measure, and compare with the standard value.

[0051] Data Records: Table 1 Set resistance(Ω) Measurement value (Ω) error(%) 5 4.99 0.20 50 50.01 0.02 100 99.98 0.02 200 200.02 0.01 Anti-interference ability test Apply electromagnetic interference signals of different intensities around the anti-interference track insulation online tester with integrated signal generator, and observe and record the working conditions and measurement results of the anti-interference track insulation online tester with integrated signal generator.

[0052] Data Records: Table 2 Interference intensity Measurement value stability Is it working properly? Low Stablize yes middle Stablize yes high Slightly fluctuating yes Environmental adaptability test Tests were carried out under different temperature conditions (including low temperature of -30°C and high temperature of +55°C) to verify the working performance of the anti-interference rail insulation online tester with integrated signal generator.

[0053] Data Records: Table 3 Temperature(℃) Working status Measurement accuracy (%) -30 Normal operation 0.20 +55 Normal operation 0.15 Repeatability measurement gives the uncertainty: Frequency uncertainty includes the uncertainty component introduced by the internal crystal oscillator error, the uncertainty component introduced by the long-term stability of the internal crystal oscillator, the frequency deviation caused by internal circuit interference, and the uncertainty component introduced by the on-site electromagnetic environment and high and low temperature effects.

[0054] Measurement Model:

[0055] Where: - frequency deviation of measuring instrument signal; ——Internal crystal oscillator deviation; ——Internal crystal oscillator stability; ——Frequency deviation caused by internal circuit interference.

[0056] The frequency uncertainty is:

[0057] in, is the frequency uncertainty, is the uncertainty component introduced by the internal crystal oscillator error, The uncertainty component introduced by the long-term stability of the internal crystal oscillator is The frequency deviation is caused by the internal circuit interference. The uncertainty component introduced by the on-site electromagnetic environment and high and low temperature effects.

[0058] Impedance uncertainty includes the uncertainty components introduced by the technical indicators of current Rogowski coil measurement, the uncertainty components of current Rogowski coil measurement stability, the uncertainty components introduced by the internal voltage measurement module, the uncertainty components introduced by the stability of the internal voltage measurement module, the uncertainty components introduced by the internal impedance calculation, the uncertainty components introduced by the display resolution of the measuring instrument, and the uncertainty components introduced by the on-site electromagnetic environment and the influence of high and low temperatures.

[0059] Measurement Model:

[0060] Where: ——Measuring instrument impedance error, Ω; ——Internal voltage measurement module error, V; ——Internal voltage measurement module stability error, V; ——Current Rogowski coil measurement error, A; ——Current Rogowski coil measurement error, A; ——Error introduced by internal impedance calculation, Ω.

[0061] The impedance uncertainty is:

[0062] in, is the impedance uncertainty, The uncertainty component introduced by the current Rogowski coil measurement technical indicators, is the uncertainty component of the current Rogowski coil measurement stability, The uncertainty component introduced by the internal voltage measurement module, The uncertainty component introduced by the stability of the internal voltage measurement module, The uncertainty introduced by the internal impedance calculation is The uncertainty component introduced by the display resolution of the measuring instrument, The uncertainty component introduced by the on-site electromagnetic environment and high and low temperature effects.

[0063] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, as an example and not a limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

Claims

1. Anti-interference rail insulation online tester with integrated signal generator, characterized in that: The invention comprises a handset, a controller arranged in the handset, a signal generating component and an insulation resistance tester, wherein the signal generating component and the insulation resistance tester are both electrically connected to the controller, wherein the controller is used to control the signal generating component to apply an AC signal for track insulation test at both ends of the tested track, the insulation resistance tester comprises a signal acquisition component and a filtering component, the signal acquisition component is used to acquire the signal of the tested track during the process of applying the AC signal for track insulation test at both ends of the tested track, the filtering component performs filtering processing on the signal of the tested track acquired by the signal acquisition component, the controller is used to calculate the insulation resistance value of the tested track according to the signal of the tested track after filtering processing, and the handset is also provided with an anti-interference component.

2. The anti-interference rail insulation online tester with integrated signal generator according to claim 1 is characterized in that: The signal generating component includes a signal generator and an operational amplifier component, wherein the signal generator is used to output a 230KHz AC square wave signal, and the operational amplifier component is used to convert the 230KHz AC square wave signal output by the signal generator into an AC signal for track insulation testing, wherein the AC signal for track insulation testing is a sine wave signal.

3. The anti-interference rail insulation online tester with integrated signal generator according to claim 2 is characterized in that: The operational amplifier component includes a first-stage operational amplifier, a second-stage operational amplifier, a third-stage operational amplifier, a fourth-stage operational amplifier and a fifth-stage operational amplifier, wherein the output end of the signal generator is electrically connected to the inverting input end of the first-stage operational amplifier, the output end of the first-stage operational amplifier is electrically connected to the inverting input end of the second-stage operational amplifier, the output end of the second-stage operational amplifier is electrically connected to the inverting input end of the third-stage operational amplifier, the output end of the third-stage operational amplifier is electrically connected to the inverting input end of the fourth-stage operational amplifier, and the output end of the fourth-stage operational amplifier is electrically connected to the inverting input end of the fifth-stage operational amplifier.

4. The anti-interference rail insulation online tester with integrated signal generator according to claim 3 is characterized in that: The handheld device also includes a power conversion component for supplying power to the first-stage operational amplifier, the second-stage operational amplifier, the third-stage operational amplifier, the fourth-stage operational amplifier and the fifth-stage operational amplifier. The power conversion component includes a positive power conversion circuit and a negative power conversion circuit. The output end of the positive power conversion circuit is electrically connected to the positive input voltage pins of the first-stage operational amplifier, the second-stage operational amplifier, the third-stage operational amplifier, the fourth-stage operational amplifier and the fifth-stage operational amplifier, and the output end of the negative power conversion circuit is electrically connected to the negative input voltage pins of the first-stage operational amplifier, the second-stage operational amplifier, the third-stage operational amplifier, the fourth-stage operational amplifier and the fifth-stage operational amplifier.

5. The anti-interference rail insulation online tester with integrated signal generator according to any one of claims 1 to 4, characterized in that: The insulation resistance tester includes a voltage acquisition component and a current acquisition component, wherein the current acquisition component is used to collect the current signal of the tested track during the process of applying an AC signal for track insulation test at both ends of the tested track, and the voltage acquisition component is used to collect the voltage signal of the tested track during the process of applying an AC signal for track insulation test at both ends of the tested track.

6. The anti-interference rail insulation online tester with integrated signal generator according to claim 5, characterized in that: The filtering component includes a current active bandpass filter and a voltage active bandpass filter, wherein the current active bandpass filter is used to filter the current signal, and the voltage active bandpass filter is used to filter the voltage signal.

7. The anti-interference rail insulation online tester with integrated signal generator according to any one of claims 1 to 4, characterized in that: The anti-interference component includes a metal shell, and the voltage collection component, the current collection component and the filter component are arranged in the metal shell; The anti-interference component also includes a magnetic shielding cover. The metal shell is provided with a magnetic shielding cover. The voltage collection component, the current collection component and the filter component are provided in the magnetic shielding cover.

8. The anti-interference rail insulation online tester with integrated signal generator according to claim 5, characterized in that: The handheld device also includes an overcurrent protector, which is connected in series between the tested track and the current collection component; The handheld device also includes an overvoltage protector, which is connected in series between the tested track and the voltage collection component. 9.Anti-interference rail insulation online testing method with integrated signal generator, characterized in that: The anti-interference rail insulation online tester with integrated signal generator applied to any one of claims 1 to 8 comprises: Acquiring test data of the anti-interference rail insulation online tester with integrated signal generator; According to the test data of the anti-interference rail insulation online tester with integrated signal generator, judging whether the anti-interference rail insulation online tester with integrated signal generator meets the preset conditions; If the anti-interference rail insulation online tester with integrated signal generator does not meet the preset conditions, calibrating the anti-interference rail insulation online tester with integrated signal generator; If the anti-interference rail insulation online tester with integrated signal generator meets the preset conditions, the signal generating component and the insulation resistance tester are connected to the tested rail; The controller controls the signal generating assembly to apply an AC signal for track insulation testing at both ends of the track being tested; The controller is used to calculate the insulation resistance of the tested track according to the signal of the tested track after filtering.

10. The anti-interference rail insulation online testing method with integrated signal generator according to claim 9, characterized in that: According to the test data of the anti-interference rail insulation online tester with integrated signal generator, judging whether the anti-interference rail insulation online tester with integrated signal generator meets the preset conditions includes: Calculating the uncertainty of the anti-interference rail insulation online tester with integrated signal generator according to the test data of the anti-interference rail insulation online tester with integrated signal generator; Calculating the measurement accuracy of the anti-interference rail insulation online tester with integrated signal generator according to the test data of the anti-interference rail insulation online tester with integrated signal generator; Calculating the anti-interference capability of the anti-interference online track insulation tester with integrated signal generator according to the test data of the anti-interference online track insulation tester with integrated signal generator; Calculating the environmental adaptability of the anti-interference rail insulation online tester with integrated signal generator according to the test data of the anti-interference rail insulation online tester with integrated signal generator; According to the uncertainty, measurement accuracy, anti-interference ability and environmental adaptability of the anti-interference track insulation online tester with integrated signal generator, it is judged whether the anti-interference track insulation online tester with integrated signal generator meets the preset conditions.

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