Insulation state detection method and system of insulation equipment

Abstract

The invention discloses an insulation state detection method and system of insulation equipment. The insulation equipment is gas insulation equipment; the insulation state detection method is executed by an insulation state detection system, and the insulation state detection system comprises a gas measuring instrument, a power supply device, a sensor and a data processing device. The insulation state detection method comprises the following steps: a gas measuring instrument detects gas parameter information of insulation gas in insulation equipment; when a parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies a test voltage to the insulation equipment; the sensor detects electrical parameter information of the insulation equipment, converts the electrical parameter information into an electrical signal and sends the electrical signal to the data processing device; and the data processing device processes the electric signal to obtain target feature information of the electric signal, and compares the target feature information with the feature information of the preset waveform to determine the insulation state of the insulation equipment. According to the technical scheme, the accuracy of insulation state detection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of insulation state detection, and in particular to an insulation state detection method and system for insulation equipment. Background Art

[0002] C4F7N / C02 mixed environmentally friendly gas is an innovative environmentally friendly gas mixture, mainly composed of perfluoroisobutyronitrile (C4F7N) and carbon dioxide (CO2) mixed in precise scientific proportions. This composite material is particularly valued in the field of electrical engineering because it exhibits excellent insulation performance and dielectric properties, while providing a safer and more reliable working environment in electrical insulation switchgear and substations.

[0003] As an environmentally friendly alternative, the C4F7N / C02 mixed gas shows a smaller global greenhouse gas effect, especially compared with traditional insulating gases such as sulfur hexafluoride (SF6), and its potential impact on global warming is greatly reduced. This mixed gas also has the advantage of being easy to handle because it is gaseous at room temperature and does not require high-pressure storage, making it more cost-effective in transportation and installation.

[0004] Key application areas for this gas mixture include gas-insulated switchgear or gas-insulated substations for ultra-high and high voltages. In these critical infrastructures, the C4F7N / C02 mixed gas provides efficient insulation performance, reduces harmful gas emissions, and is therefore in line with the pursuit of more sustainable energy solutions. Its environmentally friendly characteristics also make it a viable option that both the electrical industry and policymakers are actively considering. With the increasing demand for environmental impact assessments and the reduction of greenhouse gas emissions, the C4F7N / C02 mixed environmentally friendly gas represents a step towards a greener and safer future.

[0005] The existing C4F7N / C02 mixed environmentally friendly gas lacks an appropriate insulation state type identification method during the identification process. The conventional insulation state detection accuracy and reliability are poor, and the identification effectiveness in complex environments is poor. Summary of the invention

[0006] The invention provides an insulation state detection method and system for insulation equipment to solve the problem of insulation state detection accuracy.

[0007] According to one aspect of the present invention, a method for detecting the insulation state of an insulation device is provided, wherein the insulation device is a gas insulation device; the insulation state detection method is performed by an insulation state detection system, wherein the insulation state detection system comprises a gas measuring instrument, a power supply device, a sensor and a data processing device, wherein the power supply device is connected to a power supply terminal of the insulation device, and the sensor is connected to the data processing device;

[0008] The insulation state detection method comprises:

[0009] The gas measuring instrument detects gas parameter information of the insulating gas in the insulating device; wherein the gas parameter information includes the concentration value, pressure value and temperature value of the insulating gas;

[0010] When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies a test voltage to the insulating device;

[0011] The sensor detects the electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to the data processing device; wherein the electrical parameter information includes electromagnetic wave information, ultrasonic wave information or electric field information;

[0012] The data processing device processes the electrical signal to obtain target characteristic information of the electrical signal, compares the target characteristic information with characteristic information of a preset waveform, and determines the insulation state of the insulation device.

[0013] Optionally, the parameter value corresponding to the gas parameter information is within a preset range, including:

[0014] The concentration value of the insulating gas is within a preset concentration range, the pressure value of the insulating gas is within a preset pressure range, and the temperature value of the insulating gas is within a preset temperature range.

[0015] Optionally, the test voltage is less than or equal to a preset multiple of the rated working voltage of the insulation device; wherein the preset multiple is less than or equal to 1.5;

[0016] The sensor is installed on the surface of the insulating device; the sensor is an electromagnetic wave sensor, an ultrasonic sensor or an electric field sensor;

[0017] The power supply device comprises a voltage generator or a transformer.

[0018] Optionally, the data processing device processes the electrical signal to obtain target feature information of the electrical signal, including:

[0019] The data processing device filters the electrical signal;

[0020] The data processing device uses the average value or standard deviation of the filtered electrical signal as the target feature information, or the data processing device uses the change direction of the filtered electrical signal as the target feature information, or the data processing device uses the frequency value of the filtered electrical signal as the target feature information.

[0021] Optionally, the data processing device processes the electrical signal to obtain target feature information of the electrical signal, including:

[0022] The data processing device determines the time interval between two adjacent amplitude changes of the electrical signal, and uses the time interval as the target feature information.

[0023] Optionally, the data processing device processes the electrical signal to obtain target feature information of the electrical signal, including:

[0024] The data processing device uses fast Fourier transform or short-time Fourier transform to determine the frequency value of the electrical signal at each moment, and uses the frequency value of the filtered electrical signal as the target feature information;

[0025] Alternatively, the data processing device uses wavelet transform to take the peak value, trough value and signal transition time of the electrical signal as the target feature information of the electrical signal.

[0026] Optionally, the insulation state detection system further includes a voltage detection device;

[0027] After the power supply device applies the test voltage to the insulation device, the method further includes:

[0028] The voltage detection device detects the actual voltage of the insulation device.

[0029] Optionally, the insulation state detection system further comprises a data collector; the data collector is connected between the sensor and the data processing device;

[0030] Before the data processing device processes the electrical signal, the method further includes:

[0031] The data processing device configures the data collector and the data processing device according to the received configuration parameter information; wherein the configuration parameter information includes a sampling frequency, a signal processing mode and a time window;

[0032] The data collector transmits the electrical signal collected by the sensor to the data processing device according to the sampling frequency;

[0033] The data processing device displays the electrical signal.

[0034] Optionally, after determining the insulation state of the insulation device, the method further includes:

[0035] When the data processing device determines that the electrical parameter value corresponding to the electrical signal is within a preset electrical parameter range corresponding to the determined insulation state, it determines that the insulation state detection is accurate; wherein the electrical parameter value includes a discharge intensity value and / or a frequency value.

[0036] According to another aspect of the present invention, there is provided an insulation state detection system for an insulation device, the insulation state detection system being used to execute the insulation state detection method described in any embodiment of the present invention; the insulation state detection system comprising a gas measuring instrument, a power supply device, a sensor and a data processing device, the power supply device being connected to the power supply terminal of the insulation device, and the sensor being connected to the data processing device.

[0037] The technical solution of the embodiment of the present invention detects the gas parameter information of the insulating gas in the insulating device through a gas measuring instrument. When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies the test voltage to the insulating device, which can ensure the accuracy of the insulation state detection. After the power supply device applies the test voltage to the insulating device, the sensor detects the electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to the data processing device. The data processing device processes the electrical signal to obtain the target characteristic information of the electrical signal, compares the target characteristic information with the characteristic information of the preset waveform, and determines the insulation state of the insulating device. By processing the electrical signal by the data processing device to obtain the target characteristic information of the electrical signal, it is convenient to accurately determine the insulation state of the insulating device according to the target characteristic information, and the reliability of the insulation state detection can be improved.

[0038] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a flow chart of a method for detecting the insulation state of an insulation device provided by an embodiment of the present invention;

[0041] Figure 2 is a flow chart of another insulation state detection method of an insulation device provided by an embodiment of the present invention;

[0042] Figure 3is a flow chart of another insulation state detection method of an insulation device provided by an embodiment of the present invention;

[0043] Figure 4 is a flow chart of another insulation state detection method of an insulation device provided by an embodiment of the present invention;

[0044] Figure 5 It is a structural schematic diagram of an insulation status detection system for insulation equipment provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] An embodiment of the present invention provides an insulation state detection method for an insulation device, wherein the insulation device is a gas insulation device; the insulation state detection method is performed by an insulation state detection system, and the insulation state detection system includes a gas measuring instrument, a power supply device, a sensor, and a data processing device, wherein the power supply device is connected to the power supply end of the insulation device, and the sensor is connected to the data processing device. The insulation device may be a gas-insulated switchgear or a gas-insulated substation. The insulation gas may be a mixture of perfluoroisobutyronitrile (C4F7N) and carbon dioxide (CO2).

[0048] Figure 1 is a flowchart of a method for detecting the insulation state of an insulation device provided by an embodiment of the present invention, with reference to Figure 1 , the insulation status detection methods include:

[0049] S110. A gas measuring instrument detects gas parameter information of insulating gas in insulating equipment; wherein the gas parameter information includes a concentration value, a pressure value, and a temperature value of the insulating gas.

[0050] Specifically, by detecting the gas parameter information of the insulating gas in the insulating device through the gas measuring instrument, such as detecting the concentration value, pressure value and temperature value of the insulating gas, it can be determined whether the gas parameter information of the insulating gas meets the requirements for the operation of the insulating device. When the gas parameter information does not meet the requirements for the operation of the insulating device, timely maintenance can be performed. When the gas parameter information meets the requirements for the operation of the insulating device, the insulation state of the insulating device is detected to ensure the accuracy of the insulation state detection. In addition, by detecting the gas parameter information of the insulating gas, it can be determined whether there is a leak in the insulating gas. After ensuring that there is no leak in the insulating gas, the insulation state of the insulating device is detected to ensure the accuracy of the insulation state detection.

[0051] Optionally, before the gas meter detects the gas parameter information of the insulating gas in the insulating device, it can be confirmed whether the components in the insulation state detection system function normally, that is, whether the power supply device, the gas meter, the sensor and the data processing device can operate normally, so as to ensure the normal progress of the detection. For example, check whether the power line of the insulating device under test and the power line of the sensor are intact, check whether the wiring of the sensor is intact, etc.

[0052] S120. When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies a test voltage to the insulating device.

[0053] Specifically, when the parameter value corresponding to the gas parameter information is within a preset range, that is, the concentration value of the insulating gas is within a preset concentration range, the pressure value of the insulating gas is within a preset pressure range, and the temperature value of the insulating gas is within a preset temperature range, it can be ensured that the gas parameter information meets the requirements for the operation of the insulating device, that is, when there is no leakage of the insulating gas, the power supply device applies a test voltage to the insulating device again, which can ensure the accuracy of the insulation state detection. For example, the power supply device applies a test voltage to the power supply terminal of the insulating device, and then detects the discharge condition of the insulating device, thereby determining the insulation state of the insulating device.

[0054] Optionally, before the power supply device applies the test voltage to the insulating device, a sensor can be selected and installed. When selecting the sensor, it can be selected according to the type of discharge that may occur in the insulating device. For high-frequency partial discharge, an electromagnetic wave sensor can be selected. For low-frequency partial discharge, an ultrasonic sensor or a low-frequency electric field sensor can be selected. According to the specific requirements and working environment of the insulating device, the sensitivity of the sensor can be adjusted, and a sensor with a suitable measurement range can be selected. For example, when the voltage that the insulating device may discharge is large, a sensor with a large measurement range can be selected; when the voltage that the insulating device may discharge is small, a sensor with a small measurement range can be selected. Select a sensor with a moderate size and easy installation and operation. Then check the cable connector, electrical interface or connection point of the sensor, choose to install the sensor on the surface of the insulating device, adjust the angle of the sensor to align it with the detection area, select an area away from strong electromagnetic interference, vibration sources or other areas that affect the performance of the sensor, and use a bracket, clamp or bolt to firmly fix the sensor at the predetermined position of the insulating device. After the sensor is installed, perform necessary calibration and conduct simulation tests or system tests.

[0055] S130. The sensor detects electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to a data processing device; wherein the electrical parameter information includes electromagnetic wave information, ultrasonic wave information or electric field information.

[0056] Specifically, after the power supply device applies the test voltage to the insulating device, the sensor detects the electrical parameter information of the insulating device, such as detecting the electric field information of the insulating device, converting the electrical parameter information into an electrical signal output, or detecting the ultrasonic information of the insulating device, converting the ultrasonic information into an electrical signal output, or detecting the electromagnetic wave information of the insulating device, converting the electromagnetic wave information into an electrical signal output. In this way, the discharge intensity of the insulating device can be determined according to the electrical parameter information, thereby determining the insulation state of the insulating device under test according to the electrical parameter information of the insulating device.

[0057] S140, the data processing device processes the electrical signal to obtain target characteristic information of the electrical signal, compares the target characteristic information with characteristic information of a preset waveform, and determines the insulation state of the insulation device.

[0058] Specifically, the data processing device processes the electrical signal to obtain target characteristic information of the electrical signal, such as the mean or standard deviation of the electrical signal, or the direction of change of the electrical signal (i.e., the change trend), or the frequency value of the electrical signal, or the time interval between two signal mutations (i.e., two amplitude changes) in the electrical signal, or the peak value, trough value and signal jump time (i.e., rise time and fall time) of the electrical signal, so as to compare the target characteristic information with the characteristic information in the preset waveform and determine the insulation state of the insulating equipment.

[0059] Wherein, the preset waveform may be an electrical signal waveform of a known insulation state type, for example, the insulation state includes a first insulation state, a second insulation state, a third insulation state and a fourth insulation state, the first insulation state corresponds to a first preset waveform, the second insulation state corresponds to a second preset waveform, the third insulation state corresponds to a third preset waveform, and the fourth insulation state corresponds to a fourth preset waveform. When the target characteristic information is close to or identical to the characteristic information in the first preset waveform, the insulation state of the insulation device is determined to be the first insulation state; when the target characteristic information is close to or identical to the characteristic information in the second preset waveform, the insulation state of the insulation device is determined to be the second insulation state; when the target characteristic information is close to or identical to the characteristic information in the third preset waveform, the insulation state of the insulation device is determined to be the third insulation state; when the target characteristic information is close to or identical to the characteristic information in the fourth preset waveform, the insulation state of the insulation device is determined to be the fourth insulation state. Wherein, the first insulation state may be basically normal, the second insulation state may be in need of attention, the third insulation state may be problematic, and the fourth insulation state may be serious.

[0060] In this way, by determining the insulation state of the insulation equipment, corresponding measures can be taken in time when the insulation state of the insulation equipment is abnormal, so as to facilitate causing greater damage to the insulation equipment.

[0061] The technical solution of this embodiment detects the gas parameter information of the insulating gas in the insulating device through a gas measuring instrument. When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies the test voltage to the insulating device, which can ensure the accuracy of the insulation state detection. After the power supply device applies the test voltage to the insulating device, the sensor detects the electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to the data processing device. The data processing device processes the electrical signal to obtain the target characteristic information of the electrical signal, and compares the target characteristic information with the characteristic information of the preset waveform to determine the insulation state of the insulating device. By processing the electrical signal by the data processing device to obtain the target characteristic information of the electrical signal, it is convenient to accurately determine the insulation state of the insulating device according to the target characteristic information, which can improve the reliability of the insulation state detection.

[0062] On the basis of the above technical solution, optionally, the parameter value corresponding to the gas parameter information is within a preset range, including:

[0063] The concentration value of the insulating gas is within a preset concentration range, the pressure value of the insulating gas is within a preset pressure range, and the temperature value of the insulating gas is within a preset temperature range.

[0064] Specifically, by determining that the concentration value of the insulating gas is within a preset concentration range, the pressure value of the insulating gas is within a preset pressure range, and the temperature value of the insulating gas is within a preset temperature range, it can be ensured that the gas parameter information meets the requirements for the operation of the insulating equipment, that is, when there is no leakage of the insulating gas, the power supply device applies a test voltage to the insulating equipment again, which can ensure the accuracy of the insulation status detection.

[0065] On the basis of the above technical solution, optionally, the test voltage is less than or equal to a preset multiple of the rated working voltage of the insulating equipment; wherein the preset multiple is less than or equal to 1.5;

[0066] The sensor is installed on the surface of the insulating equipment; the sensor is an electromagnetic wave sensor, an ultrasonic sensor or an electric field sensor;

[0067] The power supply unit comprises a voltage generator or transformer.

[0068] Specifically, the test voltage is less than or equal to a preset multiple of the rated working voltage of the insulating device, for example, the test voltage is equal to the rated working voltage of the insulating device, so that the test voltage is not too large and does not cause damage to the insulating device. The sensor is installed on the surface of the insulating device, which can facilitate accurate detection of electrical parameter information of the insulating device. The power supply device includes a voltage generator or a transformer, so that the power supply device can output a test voltage to power the insulating device, thereby detecting the discharge condition of the insulating device, that is, detecting the insulation state of the insulating device.

[0069] On the basis of the above technical solutions, several methods for processing electrical signals by a data processing device are described below, but they are not intended to limit the present application.

[0070] In one embodiment, optionally, the data processing device processes the electrical signal to obtain target feature information of the electrical signal, including:

[0071] Step a1: The data processing device filters the electrical signal.

[0072] The data processing device may include a filter, and the filter in the data processing device may filter the electrical signal.

[0073] Specifically, the data processing device filters the electrical signal to remove high-frequency noise, background noise and interference signals, thereby improving the signal-to-noise ratio of the data, facilitating the processing of the denoised signal, obtaining more accurate target feature information, and making the detection of the insulation status more reliable.

[0074] Optionally, when filtering, the cutoff frequency and bandwidth parameters may be set according to the characteristics of the electrical signal, which is not limited in this embodiment. Before filtering, the integrity of the data may be checked, and when it is determined that no data is missing, the electrical signal is filtered.

[0075] Optionally, after filtering, the data processing device may display the filtered electrical signal so that the filtering effect can be intuitively seen.

[0076] Step a2: The data processing device uses the average value or standard deviation of the filtered electrical signal as the target feature information, or the data processing device uses the change direction of the filtered electrical signal as the target feature information, or the data processing device uses the frequency value of the filtered electrical signal as the target feature information.

[0077] Specifically, the data processing device may calculate the average value or standard deviation of the amplitude of the filtered electrical signal, and use the average value or standard deviation as the target feature information. For example, the average value is used as the target feature information, the average value determined by the data processing device is compared with the average value of the preset waveform, and a close preset waveform is determined, thereby determining the insulation state of the insulation device. For example, the standard deviation is used as the target feature information, the standard deviation determined by the data processing device is compared with the standard deviation of the preset waveform, and a close preset waveform is determined, thereby determining the insulation state of the insulation device.

[0078] Alternatively, the data processing device can determine the change direction (i.e., change trend) of the filtered electrical signal by drawing a trend line or using smoothing technology, use the change direction of the filtered electrical signal as target feature information, compare the change direction determined by the data processing device with the change method of the preset waveform, determine a close preset waveform, and thus determine the insulation state of the insulating equipment.

[0079] Alternatively, the data processing device may perform spectrum analysis to determine the frequency value of the filtered electrical signal, which may be an average frequency value over a period of time or a frequency value corresponding to each moment, which is not limited in this embodiment. The frequency value of the filtered electrical signal determined by the data processing device is compared with the frequency value of the preset waveform to determine a close preset waveform, thereby determining the insulation state of the insulation device.

[0080] In another embodiment, optionally, the data processing device processes the electrical signal to obtain target feature information of the electrical signal, including:

[0081] The data processing device determines the time interval between two adjacent amplitude changes of the electrical signal and uses the time interval as target characteristic information.

[0082] Specifically, the data processing device determines the time interval between two adjacent amplitude changes of the electrical signal, that is, the time interval between two adjacent amplitude mutations, and compares the time interval between two adjacent amplitude changes of the electrical signal determined by the data processing device with the time interval between two adjacent amplitude changes of a preset waveform to determine a close preset waveform, thereby determining the insulation state of the insulating device.

[0083] In another embodiment, optionally, the data processing device processes the electrical signal to obtain target feature information of the electrical signal, including:

[0084] The data processing device uses fast Fourier transform or short-time Fourier transform to determine the frequency value of the electrical signal at each moment, and uses the frequency value of the filtered electrical signal as target feature information.

[0085] Specifically, the data processing device uses fast Fourier transform or short-time Fourier transform to convert the electrical signal from the time domain to the frequency domain, determine the spectrum information of the electrical signal, determine the frequency value of the electrical signal at each moment, use the frequency value of the filtered electrical signal as the target feature information, compare the frequency value of the filtered electrical signal with the frequency value at the corresponding moment in the preset waveform, determine the close preset waveform, and thus determine the insulation state of the insulating equipment.

[0086] In another embodiment, optionally, the data processing device processes the electrical signal to obtain target feature information of the electrical signal, including:

[0087] The data processing device adopts wavelet transform and takes the peak value, trough value and signal jump time of the electric signal as the target characteristic information of the electric signal.

[0088] Specifically, the data processing device uses wavelet transform to convert the electrical signal, and obtains the peak value, trough value and signal transition time (rise time and fall time) of the electrical signal as the target characteristic information of the electrical signal, and compares the peak value, trough value and signal transition time of the electrical signal with the peak value, trough value and signal transition time in the preset waveform to determine the close preset waveform, thereby determining the insulation state of the insulating equipment.

[0089] On the basis of the above technical solutions, optionally, the insulation state detection system also includes a voltage detection device.

[0090] Figure 2 is a flowchart of another insulation state detection method of an insulation device provided by an embodiment of the present invention. Optionally, refer to Figure 2 , the insulation status detection methods include:

[0091] S210. A gas measuring instrument detects gas parameter information of insulating gas in insulating equipment; wherein the gas parameter information includes concentration value, pressure value and temperature value of the insulating gas.

[0092] S220. When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies a test voltage to the insulating device.

[0093] S230. The voltage detection device detects the actual voltage of the insulation equipment.

[0094] Specifically, the voltage detection device can be a voltmeter, or a voltage transformer or other voltage detection device, which is not limited in this embodiment. In this way, the voltage condition of the power supply end of the insulating device can be monitored in real time during the process of applying the test voltage, and the test voltage output by the power supply device can be adjusted according to the actual voltage so that the output test voltage meets the test requirements.

[0095] Optionally, the insulation state detection system of the insulation device may further include a current detection device, which may be a current sensor, and the current detection device may detect the actual current of the insulation device after the power supply device applies the test voltage to the insulation device under test. In this way, the actual current of the power supply end of the insulation device may be monitored in real time during the process of applying the test voltage, and the test voltage output by the power supply device may be adjusted according to the actual current, so that the output test voltage meets the test requirements.

[0096] S240. The sensor detects electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to a data processing device; wherein the electrical parameter information includes electromagnetic wave information, ultrasonic wave information or electric field information.

[0097] S250, the data processing device processes the electrical signal to obtain target characteristic information of the electrical signal, compares the target characteristic information with characteristic information of a preset waveform, and determines the insulation state of the insulation device.

[0098] On the basis of the above technical solutions, optionally, the insulation status detection system further includes a data collector; the data collector is connected between the sensor and the data processing device.

[0099] Figure 3 is a flowchart of another insulation state detection method of an insulation device provided by an embodiment of the present invention. Optionally, refer to Figure 3 , the insulation status detection methods include:

[0100] S310. A gas measuring instrument detects gas parameter information of insulating gas in insulating equipment; wherein the gas parameter information includes concentration value, pressure value and temperature value of the insulating gas.

[0101] S320. When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies a test voltage to the insulating device.

[0102] S330. The voltage detection device detects the actual voltage of the insulating device.

[0103] S340. The sensor detects electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to a data processing device; wherein the electrical parameter information includes electromagnetic wave information, ultrasonic wave information or electric field information.

[0104] S350. The data processing device configures the data collector and the data processing device according to the received configuration parameter information; wherein the configuration parameter information includes a sampling frequency, a signal processing mode and a time window.

[0105] Specifically, the data processing device may be a host computer. The data processing device configures the data collector and the data processing device according to the received configuration parameter information, such as configuring the sampling frequency of the data collector, the signal processing mode and the time window of the data processing device. For example, if the sampling frequency of the data collector is 100 MHz, more data can be collected, and the time window is 5 microseconds, then the data received by the data processing device is 5 microseconds, that is, the data of the electrical signal can be stored every 5 microseconds.

[0106] S360, the data collector transmits the electrical signal collected by the sensor to the data processing device according to the sampling frequency.

[0107] Specifically, the data collector transmits the electrical signal collected by the sensor to the data processing device. For example, the data collector can convert the electrical signal collected by the sensor into a digital signal. After the data processing device obtains the digital signal, it can convert it into a corresponding electrical signal, thereby processing the electrical signal collected by the sensor.

[0108] S370. The data processing device displays the electrical signal.

[0109] Specifically, the data processing device can display the electrical signal, thereby intuitively displaying the electrical signal in real time, making it easy to observe the electrical signal. When the electrical signal fluctuates abnormally, the machine can be shut down for maintenance in a timely manner.

[0110] Optionally, the data processing device may also transmit the electrical signal to a backup device to achieve timely data backup. The backup device may be a server or a mobile storage device.

[0111] S380, the data processing device processes the electrical signal to obtain target characteristic information of the electrical signal, compares the target characteristic information with characteristic information of a preset waveform, and determines the insulation state of the insulation device.

[0112] On the basis of the above technical solutions, Figure 4 is a flowchart of another insulation state detection method of an insulation device provided by an embodiment of the present invention. Optionally, refer to Figure 4 , the insulation status detection methods include:

[0113] S410. A gas measuring instrument detects gas parameter information of insulating gas in insulating equipment; wherein the gas parameter information includes concentration value, pressure value and temperature value of the insulating gas.

[0114] S420: When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies a test voltage to the insulating device.

[0115] S430. The voltage detection device detects the actual voltage of the insulating device.

[0116] S440. The sensor detects electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to a data processing device; wherein the electrical parameter information includes electromagnetic wave information, ultrasonic wave information or electric field information.

[0117] S450, the data processing device processes the electrical signal to obtain target characteristic information of the electrical signal, compares the target characteristic information with characteristic information of a preset waveform, and determines the insulation state of the insulation device.

[0118] S460. When the data processing device determines that the electrical parameter value corresponding to the electrical signal is within a preset electrical parameter range corresponding to the determined insulation state, it is determined that the insulation state detection is accurate; wherein the electrical parameter value includes a discharge intensity value and / or a frequency value.

[0119] Specifically, the preset electrical parameter range is the electrical parameter range in the relevant standard. The preset electrical parameter range includes a discharge intensity range and / or a frequency range. For example, the preset electrical parameter range includes a discharge intensity range and a frequency range, and different insulation states correspond to different discharge intensity ranges and frequency ranges. Among them, the discharge intensity can be the electric field intensity or the intensity of the electromagnetic wave, etc. The discharge intensity is the amplitude of the electrical signal corresponding to the electrical parameter information. Among them, the relevant standard can be the partial discharge measurement standard IEC60270.

[0120] For example, the insulation state includes a first insulation state, a second insulation state, a third insulation state and a fourth insulation state. The discharge intensity range includes a first discharge intensity range, a second discharge intensity range, a third discharge intensity range and a fourth discharge intensity range; the frequency range includes a first frequency range, a second frequency range, a third frequency range and a fourth frequency range. For example, according to the insulation state detection method of the insulation device provided by the embodiment of the present invention, it is determined that the insulation state of the insulation device is the first insulation device, then it is determined whether the amplitude of the electrical signal determined by the data processing device is in the first discharge intensity range, and whether the frequency value of the electrical signal determined by the data processing device is in the first frequency range. If so, it is determined that the insulation state detection is accurate. The judgment methods for other insulation states are the same and will not be repeated here.

[0121] In this way, by comparing the determined insulation state with the standard, the accuracy of the insulation state detection can be further determined. In addition, by comparing the threshold of the discharge intensity in the standard (such as the boundary value of the discharge intensity range) with the amplitude of the detected electrical signal, the severity of the discharge of the insulation device under test can be determined.

[0122] Optionally, during the detection of the insulation state, all important data in the test process can be recorded in time, including the test time, test conditions, collected signal characteristics (target characteristic information) and the results of the determined insulation state, and a test report can be written. Specifically, the date and time of the test can be recorded, the specific location where the test is conducted can be recorded, the operating status of the insulation equipment during the test can be recorded, including the load condition, voltage and environmental conditions of the insulation equipment, the configuration and parameter settings of the sensor, data processing device and data acquisition device can be recorded, including the sensor model, the filter settings of the data processing device and the sampling rate of the data acquisition device, etc., the relevant information of the test environment can be recorded, including the surrounding electromagnetic interference sources and the equipment installation location, and the recorded information can be organized into a report.

[0123] An embodiment of the present invention further provides an insulation state detection system for insulation equipment, and the insulation state detection system is used to execute the insulation state detection method provided by any embodiment of the present invention. Figure 5 is a schematic diagram of the structure of an insulation state detection system for an insulation device provided by an embodiment of the present invention, with reference to Figure 5 The insulation state detection system includes a gas measuring instrument 101, a power supply device 102, a sensor 103 and a data processing device 104. The power supply device 102 is connected to the power supply end of the insulation device 201, and the sensor 103 is connected to the data processing device 104.

[0124] Specifically, the gas meter 101 can test the gas parameter information of the insulating gas in the insulating device. The power supply device 102 includes a voltage generator or a transformer, so as to output the test voltage to the power supply terminal of the insulating device 201 under test. The sensor 103 can detect the electrical parameter information of the insulating device, and convert the electrical parameter information into an electrical signal, and transmit it to the data processing device 104. The data processing device 104 can be a host computer, etc. The data processing device 104 can process the electrical signal to obtain the target characteristic information of the electrical signal, so as to compare the target characteristic information with the characteristic information in the preset waveform and determine the insulation state of the insulating device.

[0125] It should be noted that Figure 5 The sensor 103 is shown to be connected to the insulating device 201, which does not mean that the sensor 103 and the insulating device 201 are connected, but only means that the sensor 103 detects the electrical parameter information of the insulating device 201. Similarly, the gas meter 101 is connected to the insulating device 201, which does not mean that the gas meter 101 and the insulating device 201 are connected, but only means that the gas meter 101 detects the gas parameter information of the insulating gas in the insulating device 201.

[0126] The technical solution of this embodiment detects the gas parameter information of the insulating gas in the insulating device through a gas measuring instrument. When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies the test voltage to the insulating device, which can ensure the accuracy of the insulation state detection. After the power supply device applies the test voltage to the insulating device, the sensor detects the electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to the data processing device. The data processing device processes the electrical signal to obtain the target characteristic information of the electrical signal, and compares the target characteristic information with the characteristic information of the preset waveform to determine the insulation state of the insulating device. By processing the electrical signal by the data processing device to obtain the target characteristic information of the electrical signal, it is convenient to accurately determine the insulation state of the insulating device according to the target characteristic information, which can improve the reliability of the insulation state detection.

[0127] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0128] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting the insulation state of an insulating device, characterized in that: The insulating device is a gas-insulated device; the insulating state detection method is performed by an insulating state detection system, the insulating state detection system comprises a gas measuring instrument, a power supply device, a sensor and a data processing device, the power supply device is connected to the power supply terminal of the insulating device, and the sensor is connected to the data processing device; The insulation state detection method comprises: The gas measuring instrument detects gas parameter information of the insulating gas in the insulating device; wherein the gas parameter information includes the concentration value, pressure value and temperature value of the insulating gas; When the parameter value corresponding to the gas parameter information is within a preset range, the power supply device applies a test voltage to the insulating device; The sensor detects the electrical parameter information of the insulating device, and converts the electrical parameter information into an electrical signal and sends it to the data processing device; wherein the electrical parameter information includes electromagnetic wave information, ultrasonic wave information or electric field information; The data processing device processes the electrical signal to obtain target characteristic information of the electrical signal, compares the target characteristic information with characteristic information of a preset waveform, and determines the insulation state of the insulation device.

2. The method according to claim 1, characterized in that: The parameter value corresponding to the gas parameter information is within a preset range, including: The concentration value of the insulating gas is within a preset concentration range, the pressure value of the insulating gas is within a preset pressure range, and the temperature value of the insulating gas is within a preset temperature range.

3. The method according to claim 1, characterized in that The test voltage is less than or equal to a preset multiple of the rated working voltage of the insulation equipment; wherein the preset multiple is less than or equal to 1.5; The sensor is installed on the surface of the insulating device; the sensor is an electromagnetic wave sensor, an ultrasonic sensor or an electric field sensor; The power supply device comprises a voltage generator or a transformer.

4. The method according to claim 1, characterized in that: The data processing device processes the electrical signal to obtain target feature information of the electrical signal, including: The data processing device filters the electrical signal; The data processing device uses the average value or standard deviation of the filtered electrical signal as the target feature information, or the data processing device uses the change direction of the filtered electrical signal as the target feature information, or the data processing device uses the frequency value of the filtered electrical signal as the target feature information.

5. The method according to claim 1, characterized in that The data processing device processes the electrical signal to obtain target feature information of the electrical signal, including: The data processing device determines the time interval between two adjacent amplitude changes of the electrical signal, and uses the time interval as the target feature information.

6. The method according to claim 1, characterized in that The data processing device processes the electrical signal to obtain target feature information of the electrical signal, including: The data processing device uses fast Fourier transform or short-time Fourier transform to determine the frequency value of the electrical signal at each moment, and uses the frequency value of the filtered electrical signal as the target feature information; Alternatively, the data processing device uses wavelet transform to take the peak value, trough value and signal transition time of the electrical signal as the target feature information of the electrical signal.

7. The method according to claim 1, characterized in that The insulation state detection system also includes a voltage detection device; After the power supply device applies the test voltage to the insulation device, the method further includes: The voltage detection device detects the actual voltage of the insulation device.

8. The method according to claim 1, characterized in that The insulation state detection system further includes a data collector; the data collector is connected between the sensor and the data processing device; Before the data processing device processes the electrical signal, the method further includes: The data processing device configures the data collector and the data processing device according to the received configuration parameter information; wherein the configuration parameter information includes a sampling frequency, a signal processing mode and a time window; The data collector transmits the electrical signal collected by the sensor to the data processing device according to the sampling frequency; The data processing device displays the electrical signal.

9. The method according to any one of claims 1 to 8, characterized in that: After determining the insulation state of the insulation device, the method further includes: When the data processing device determines that the electrical parameter value corresponding to the electrical signal is within a preset electrical parameter range corresponding to the determined insulation state, it determines that the insulation state detection is accurate; wherein the electrical parameter value includes a discharge intensity value and / or a frequency value.

10. An insulation status detection system for an insulation device, characterized in that: The insulation state detection system is used to execute the insulation state detection method described in any one of claims 1 to 9; the insulation state detection system includes a gas measuring instrument, a power supply device, a sensor and a data processing device, the power supply device is connected to the power supply end of the insulation equipment, and the sensor is connected to the data processing device.

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