Cable comprehensive detection interconnection terminal monitoring system based on HFCT

Abstract

The invention, which belongs to the technical field of the power system, discloses an HFCT-based cable comprehensive detection interconnection terminal monitoring system comprising an HFCT sensor, a signal processing unit, a signal acquisition unit, an environmental data acquisition unit, a data processing terminal and a cable vibration monitoring module. The HFCT sensor is electrically connected with the signal processing unit. The signal acquisition unit is electrically connected with the signal processing unit, the environment data acquisition unit, the data processing terminal and the cable vibration monitoring module. By means of the mode, state monitoring of the cable is achieved, meanwhile, whether the cable is suitable for continuous service or not is evaluated, and therefore the cable fault hidden danger is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a cable comprehensive detection interconnection terminal monitoring system based on HFCT. Background Art

[0002] High Frequency Current Transformer (HFCT) in inductive sensors has the advantages of strong portability, easy installation, and good anti-interference ability on site. 1. It can quantify the intensity of partial discharge; 2. It is easy to carry, easy to use, and cost-effective; 3. It has high detection sensitivity. After partial discharge occurs, the discharge pulse current will propagate along the axial direction of the grounding wire, that is, it will generate a magnetic field on the plane perpendicular to the current propagation direction. The inductive sensor couples the discharge signal from this magnetic field.

[0003] Among many existing technologies, Chinese patent application CN111091108A discloses a cable resistance detection system, which includes a drone, a cable detection module, a wireless transmission module and a remote monitoring terminal. The drone is equipped with an image acquisition device for acquiring cable images. The cable detection module is installed on the cable for acquiring cable signals. The cable images acquired by the drone and the signals acquired by the cable detection module are transmitted to the remote monitoring terminal through the wireless transmission module. The remote monitoring terminal is used to process, analyze and display the acquired signals.

[0004] However, this patent application is unable to evaluate the wear and tear of the cable and the environment in which it is located, and is also unable to evaluate whether the cable is suitable for continued service.

[0005] Based on this, the present invention designs a cable comprehensive detection interconnection terminal monitoring system based on HFCT to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a cable comprehensive detection interconnection terminal monitoring system based on HFCT.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A cable comprehensive detection interconnection terminal monitoring system based on HFCT, comprising: an HFCT sensor, a signal processing unit, a signal acquisition unit, an environmental data acquisition unit, a data processing terminal and a cable vibration monitoring module;

[0009] The HFCT sensor is electrically connected to the signal processing unit, and the signal acquisition unit is electrically connected to the signal processing unit, the environmental data acquisition unit, the data processing terminal, and the cable vibration monitoring module;

[0010] The HFCT sensor is used to monitor the cable operation data at the cable monitoring point, and the HFCT sensor sends the cable monitoring data to the signal processing unit;

[0011] The signal processing unit is used to filter and amplify the cable monitoring data, and send the processed cable monitoring data to the signal acquisition unit;

[0012] The environmental data acquisition unit is used to monitor the cable operation environment, and sends the monitored environmental data to the signal acquisition unit;

[0013] The cable vibration monitoring module is used for cable vibration detection, the cable vibration monitoring module is electrically connected to the signal acquisition unit, and the cable vibration monitoring module sends the cable vibration data to the signal acquisition unit;

[0014] The signal acquisition unit is used to periodically collect the processed cable monitoring data sent by the signal processing unit. The signal acquisition unit converts the collected analog signals of the environmental data, cable monitoring data, and cable vibration data into digital signals recognized by the data processing terminal;

[0015] It also includes a cable status judgment unit for judging the cable status, the cable status judgment unit is electrically connected to the data processing terminal, the data processing terminal sends the cable monitoring data to the cable status judgment unit, and the cable status judgment unit judges the cable operation status according to the cable monitoring data;

[0016] It also includes a cable environment assessment module for cable operation environment assessment, the cable environment assessment module is electrically connected to the data processing terminal, the data processing terminal sends the environmental data to the cable state judgment unit, and the cable state judgment unit generates an environmental coefficient L;

[0017] It also includes a cable wear assessment module for assessing cable wear conditions, wherein the data processing terminal sends the cable vibration data to the cable wear assessment module, and the cable wear assessment module generates a wear coefficient Q;

[0018] It also includes a cable operation evaluation module for evaluating whether the cable is suitable for continued service. The cable operation evaluation module evaluates whether the cable is suitable for continued service based on the cable operation status, wear coefficient Q, and environmental coefficient L.

[0019] Furthermore, the cable monitoring data of the HFCT sensor includes the operation status and power status of the cable;

[0020] When the cable operation state is normal and the power abnormality is normal, the cable operation state determined by the cable state determination unit is normal;

[0021] When the cable operation state is normal and the power abnormality is abnormal, the cable operation state determined by the cable state determination unit is resistance abnormality;

[0022] When the cable operation state is abnormal high voltage and the power abnormality is normal, the cable operation state determined by the cable state judgment unit is abnormal capacitance;

[0023] When the cable operation state is abnormal high voltage and the power abnormality is abnormal, the cable operation state determined by the cable state judgment unit is abnormal capacitance and resistance;

[0024] When the cable operation state is low voltage abnormality and the power abnormality is normal, the cable operation state determined by the cable state judgment unit is resistance abnormality;

[0025] When the cable operation state is low voltage abnormality and the power abnormality is abnormal, the cable operation state determined by the cable state determination unit is resistance abnormality;

[0026] The cable status judgment unit sends the cable operation status data to the data processing terminal.

[0027] Furthermore, the environmental data acquisition unit includes a temperature sensor, a humidity sensor and a pH sensor, wherein the temperature sensor is used to detect the actual value of the temperature data F of the soil where the cable is located. 1 ;

[0028] The humidity sensor is used to detect the actual value F of the humidity data of the soil where the cable is located. 2 ;

[0029] The pH sensor is used to detect the actual pH value of the soil where the cable is located. 3 .

[0030] Furthermore, the cable environment assessment module calculates the cable environmental coefficient L according to the following formula:

[0031] L=C 1 F 1 +C 2 *F 2 +C 3 *F 3 ;

[0032] Among them C 1 , C 2 , C 3 are all expressed as weight coefficients.

[0033] Furthermore, the cable environment assessment module compares L with a preset environmental coefficient value B and determines whether the environment in which the cable is located is normal;

[0034] When L is less than or equal to B, the cable environment assessment module determines that the cable environment is normal;

[0035] When L is greater than B, the cable environment assessment module determines that the environment in which the cable is located is abnormal.

[0036] Furthermore, the cable vibration data is the number of vibrations N of the cable within a period;

[0037] The cable wear assessment module calculates the cable wear coefficient Q according to the following formula:

[0038] Q=1 / T 2 *N*K;

[0039] K represents the soil roughness coefficient, and T represents the service time of the cable;

[0040] The cable wear assessment module compares the Q value with the cable wear standard value A;

[0041] When the Q value is greater than or equal to the cable wear standard value A, the cable wear assessment module assesses the wear abnormality of the cable;

[0042] When the Q value is less than the cable wear standard value A, the cable wear assessment module assesses that the wear of the cable is normal.

[0043] Furthermore, when the cable operation evaluation module identifies that abnormal words appear in the cable status data of the cable status judgment unit, the cable operation evaluation module evaluates that the cable is not suitable for continued service;

[0044] When the cable operation evaluation module does not recognize that abnormal words appear in the cable status data of the cable status judgment unit, the cable operation evaluation module determines the correlation between Q and L through covariance and uses the following formula:

[0045]

[0046] Where n is the number of Q and L data; q i and l i denote the observed values ​​of Q and L respectively, and denote the means of Q and L respectively;

[0047] When Cov(Q, L) is greater than or equal to the set value C, the cable operation evaluation module evaluates that the cable is not suitable for continued service;

[0048] When Cov(Q, L) is less than the set value C, the cable operation evaluation module evaluates that the cable can continue to be in service.

[0049] Furthermore, the HFCT sensor is a split HFCT high-frequency current sensor.

[0050] Furthermore, the cable vibration monitoring module is a vibration sensor.

[0051] Furthermore, the signal acquisition unit is a data collector.

[0052] Compared with the prior art, the present invention has the following beneficial effects: 1. By collecting the environmental data of the cable and the cable vibration data, the environmental coefficient L and the wear coefficient Q are calculated respectively, which serve as the basis for judging whether the cable is suitable for continued operation;

[0053] By calculating the correlation between the environmental factor L and the wear factor Q through covariance, a more accurate judgment can be made on whether the cable is suitable for continued operation.

[0054] 2. The HFCT sensor adopts a split HFCT high-frequency current sensor, and the coil can be opened and closed, which is convenient for testing, installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0056] Figure 1 The present invention is a cable comprehensive detection interconnection terminal monitoring system based on HFCT Figure 1 ;

[0057] Figure 2 The present invention is a cable comprehensive detection interconnection terminal monitoring system based on HFCT Figure 2 .

[0058] The numbers in the figure represent:

[0059] 1. HFCT sensor 2. Signal processing unit 3. Signal acquisition unit 4. Environmental data acquisition unit 41. Temperature sensor 42. Humidity sensor 43. PH value sensor 5. Data processing terminal 6. Cable status judgment unit 7. Cable environment assessment module 8. Cable wear assessment module 9. Cable vibration monitoring module 10. Cable operation assessment module. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 are within the scope of protection of the present invention.

[0061] Embodiment 1: In some embodiments, please refer to the drawings of the specification Figure 1-Figure 2 , a cable comprehensive detection interconnection terminal monitoring system based on HFCT, comprising: an HFCT sensor 1, a signal processing unit 2, a signal acquisition unit 3, an environmental data acquisition unit 4, a data processing terminal 5 and a cable vibration monitoring module 9;

[0062] The HFCT sensor 1 is electrically connected to the signal processing unit 2, and the signal acquisition unit 3 is electrically connected to the signal processing unit 2, the environmental data acquisition unit 4, the data processing terminal 5, and the cable vibration monitoring module 9;

[0063] The HFCT sensor 1 is used to monitor the cable operation data at the cable monitoring point, and the HFCT sensor 1 sends the cable monitoring data to the signal processing unit 2;

[0064] The signal processing unit 2 is used to filter and amplify the cable monitoring data, and send the processed cable monitoring data to the signal acquisition unit 3;

[0065] The environmental data acquisition unit 4 is used to monitor the cable operation environment, and sends the monitored environmental data to the signal acquisition unit 3;

[0066] The cable vibration monitoring module 9 is used for cable vibration detection. The cable vibration monitoring module 9 is electrically connected to the signal acquisition unit 3. The cable vibration monitoring module 9 sends the cable vibration data to the signal acquisition unit 3.

[0067] The signal acquisition unit 3 is used to periodically collect the processed cable monitoring data sent by the signal processing unit 2. The signal acquisition unit 3 converts the collected analog signals of the environmental data, cable monitoring data, and cable vibration data into digital signals recognized by the data processing terminal 5;

[0068] It also includes a cable status judgment unit 6 for judging the cable status. The cable status judgment unit 6 is electrically connected to the data processing terminal 5. The data processing terminal 5 sends the cable monitoring data to the cable status judgment unit 6. The cable status judgment unit 6 judges the cable operation status according to the cable monitoring data.

[0069] It also includes a cable environment assessment module 7 for cable operation environment assessment, the cable environment assessment module 7 is electrically connected to the data processing terminal 5, the data processing terminal 5 sends the environmental data to the cable state judgment unit 6, and the cable state judgment unit 6 generates an environmental coefficient L;

[0070] It also includes a cable wear assessment module 8 for assessing the cable wear condition. The data processing terminal 5 sends the cable vibration data to the cable wear assessment module 8, and the cable wear assessment module 8 generates a wear coefficient Q;

[0071] It also includes a cable operation evaluation module 10 for evaluating whether the cable is suitable for continued service. The cable operation evaluation module 10 evaluates whether the cable is suitable for continued service based on the cable operation status, wear coefficient Q, and environmental coefficient L.

[0072] When the present invention is used, the environmental data of the cable and the cable vibration data are collected, and the environmental coefficient L and the wear coefficient Q are calculated respectively as the basis for judging whether the cable is suitable for continued operation;

[0073] When the present invention is used, the cable state judgment unit 6 judges the operation state of the cable through the monitoring data of the HFCT sensor 1, so as to timely discover the operation state of the cable and avoid the hidden danger of cable failure.

[0074] Embodiment 2: In some embodiments, Figure 1 , Figure 2 As shown, as a preferred embodiment of the present invention, the cable monitoring data of the HFCT sensor 1 includes the operating state and power state of the cable;

[0075] When the cable operation state is normal and the power abnormality is normal, the cable operation state determined by the cable state determination unit 6 is normal;

[0076] When the cable operation state is normal and the power abnormality is abnormal, the cable operation state determined by the cable state determination unit 6 is resistance abnormality;

[0077] When the cable operation state is abnormal high voltage and the power abnormality is normal, the cable operation state determined by the cable state determination unit 6 is abnormal capacitance;

[0078] When the cable operation state is abnormal high voltage and the power abnormality is abnormal, the cable operation state determined by the cable state determination unit 6 is abnormal capacitance and resistance;

[0079] When the cable operation state is low voltage abnormality and the power abnormality is normal, the cable operation state determined by the cable state determination unit 6 is resistance abnormality;

[0080] When the cable operation state is low voltage abnormality and the power abnormality is abnormal, the cable operation state determined by the cable state determination unit 6 is resistance abnormality;

[0081] The cable status determination unit 6 sends the cable operation status data to the data processing terminal 5 .

[0082] The environmental data acquisition unit 4 includes a temperature sensor 41, a humidity sensor 42 and a pH sensor 43. The temperature sensor 41 is used to detect the actual value F of the temperature data of the soil where the cable is located. 1 ;

[0083] The humidity sensor 42 is used to detect the actual value F of the humidity data of the soil where the cable is located. 2 ;

[0084] The pH sensor 43 is used to detect the actual pH value of the soil where the cable is located. 3 .

[0085] The cable environmental assessment module 7 calculates the environmental factor L of the cable according to the following formula:

[0086] L=C 1 F 1 +C 2 *F 2 +C 3 *F 3 ;

[0087] Among them C 1 , C 2 , C 3 are all expressed as weight coefficients.

[0088] The cable environment assessment module 7 compares L with the preset environmental coefficient value B and determines whether the environment in which the cable is located is normal;

[0089] When L is less than or equal to B, the cable environment assessment module 7 determines that the environment in which the cable is located is normal;

[0090] When L is greater than B, the cable environment assessment module 7 determines that the environment in which the cable is located is abnormal.

[0091] The cable vibration data is the number of vibrations N of the cable in a period;

[0092] The cable wear assessment module 8 calculates the cable wear coefficient Q according to the following formula:

[0093] Q=1 / T 2 *N*K;

[0094] K represents the soil roughness coefficient, and T represents the service time of the cable;

[0095] The cable wear assessment module 8 compares the Q value with the cable wear standard value A;

[0096] When the Q value is greater than or equal to the cable wear standard value A, the cable wear assessment module 8 assesses the wear abnormality of the cable;

[0097] When the Q value is less than the cable wear standard value A, the cable wear assessment module 8 assesses that the wear of the cable is normal.

[0098] When the cable operation evaluation module 10 identifies that abnormal words appear in the cable status data of the cable status judgment unit 6, the cable operation evaluation module 10 evaluates that the cable is not suitable for continued service;

[0099] When the cable operation evaluation module 10 does not recognize that abnormal words appear in the cable status data of the cable status judgment unit 6, the cable operation evaluation module 10 determines the correlation between Q and L through covariance and adopts the following formula:

[0100]

[0101] Where n is the number of Q and L data; q i and l i denote the observed values ​​of Q and L respectively, and denote the means of Q and L respectively;

[0102] When Cov(Q, L) is greater than or equal to the set value C, the cable operation evaluation module 10 evaluates that the cable is not suitable for continued service;

[0103] When Cov(Q, L) is less than the set value C, the cable operation evaluation module 10 evaluates that the cable can continue to be in service.

[0104] By calculating the correlation between the environmental factor L and the wear factor Q through covariance, a more accurate judgment can be made on whether the cable is suitable for continued operation.

[0105] Embodiment 3: In some embodiments, Figure 1-Figure 2 As shown, as a preferred embodiment of the present invention, the HFCT sensor 1 is a split HFCT high-frequency current sensor;

[0106] The cable vibration monitoring module 9 is a vibration sensor.

[0107] The signal acquisition unit 3 is a data collector.

[0108] When the present invention is used, the HFCT sensor HFCT sensor 1 adopts a split HFCT high-frequency current sensor, and the coil can be opened and closed, which is convenient for testing, installation and disassembly.

[0109] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cable comprehensive detection interconnection terminal monitoring system based on HFCT, characterized by: include: HFCT sensor (1), signal processing unit (2), signal acquisition unit (3), environmental data acquisition unit (4), data processing terminal (5) and cable vibration monitoring module (9); The HFCT sensor (1) is electrically connected to the signal processing unit (2), and the signal acquisition unit (3) is electrically connected to the signal processing unit (2), the environmental data acquisition unit (4), the data processing terminal (5), and the cable vibration monitoring module (9); The HFCT sensor (1) is used to monitor the cable operation data at the cable monitoring point, and the HFCT sensor (1) sends the cable monitoring data to the signal processing unit (2); The signal processing unit (2) is used to filter and amplify the cable monitoring data, and send the processed cable monitoring data to the signal acquisition unit (3); The environmental data acquisition unit (4) is used to monitor the cable operation environment, and sends the monitored environmental data to the signal acquisition unit (3); The cable vibration monitoring module (9) is used for detecting cable vibration, the cable vibration monitoring module (9) is electrically connected to the signal acquisition unit (3), and the cable vibration monitoring module (9) sends the cable vibration data to the signal acquisition unit (3); The signal acquisition unit (3) is used to periodically acquire the processed cable monitoring data sent by the signal processing unit (2), and the signal acquisition unit (3) converts the acquired analog signals of the environmental data, cable monitoring data, and cable vibration data into digital signals recognized by the data processing terminal (5); The device also comprises a cable status judgment unit (6) for judging the cable status, wherein the cable status judgment unit (6) is electrically connected to the data processing terminal (5), and the data processing terminal (5) sends the cable monitoring data to the cable status judgment unit (6), and the cable status judgment unit (6) judges the cable operation status according to the cable monitoring data; It also includes a cable environment assessment module (7) for cable operation environment assessment, the cable environment assessment module (7) is electrically connected to the data processing terminal (5), the data processing terminal (5) sends environmental data to the cable state judgment unit (6), and the cable state judgment unit (6) generates an environmental coefficient L; It also includes a cable wear assessment module (8) for assessing the cable wear condition. The data processing terminal (5) sends the cable vibration data to the cable wear assessment module (8), and the cable wear assessment module (8) generates a wear coefficient Q. It also includes a cable operation evaluation module (10) for evaluating whether the cable is suitable for continued service. The cable operation evaluation module (10) evaluates whether the cable is suitable for continued service based on the cable operation status, wear coefficient Q, and environmental coefficient L.

2. The cable comprehensive detection interconnection terminal monitoring system based on HFCT according to claim 1 is characterized in that: The cable monitoring data of the HFCT sensor (1) includes the operation status and power status of the cable; When the cable operation state is normal and the power abnormality is normal, the cable operation state determined by the cable state determination unit (6) is normal; When the cable operation state is normal and the power abnormality is abnormal, the cable operation state determined by the cable state determination unit (6) is resistance abnormality; When the cable operation state is abnormal high voltage and the power abnormality is normal, the cable operation state determined by the cable state judgment unit (6) is abnormal capacitance; When the cable operation state is abnormal high voltage and the power abnormality is abnormal, the cable operation state determined by the cable state judgment unit (6) is abnormal capacitance and resistance; When the cable operation state is low voltage abnormality and the power abnormality is normal, the cable operation state determined by the cable state judgment unit (6) is resistance abnormality; When the cable operation state is low voltage abnormality and the power abnormality is abnormal, the cable operation state determined by the cable state judgment unit (6) is resistance abnormality; The cable status judgment unit (6) sends the cable operation status data to the data processing terminal (5).

3. The cable comprehensive detection interconnection terminal monitoring system based on HFCT according to claim 2 is characterized in that: The environmental data acquisition unit (4) comprises a temperature sensor (41), a humidity sensor (42) and a pH value sensor (43), wherein the temperature sensor (41) is used to detect an actual value F1 of temperature data of the soil in which the cable is located; The humidity sensor (42) is used to detect the actual value F2 of the humidity data of the soil where the cable is located; the pH value sensor (43) is used to detect the actual value F3 of the pH value data of the soil where the cable is located.

4. The cable comprehensive detection interconnection terminal monitoring system based on HFCT according to claim 3 is characterized in that: The cable environment assessment module (7) calculates the cable environment coefficient L according to the following formula: L = C1F1 + C2*F2 + C3*F3; Among them, C1, C2, and C3 are all expressed as weight coefficients.

5. The cable comprehensive detection interconnection terminal monitoring system based on HFCT according to claim 4 is characterized in that: The cable environment assessment module (7) compares L with a preset environmental coefficient value B and determines whether the environment in which the cable is located is normal; When L is less than or equal to B, the cable environment assessment module (7) determines that the environment in which the cable is located is normal; When L is greater than B, the cable environment assessment module (7) determines that the environment in which the cable is located is abnormal.

6. The HFCT-based cable comprehensive detection interconnection terminal monitoring system according to claim 5 is characterized in that: The cable vibration data is the number of vibrations N of the cable within a period; The cable wear assessment module (8) calculates the cable wear coefficient Q according to the following formula: Q=1 / T 2 *N*K; K represents the soil roughness coefficient, and T represents the service time of the cable; The cable wear assessment module (8) compares the Q value with the cable wear standard value A; When the Q value is greater than or equal to the cable wear standard value A, the cable wear assessment module (8) assesses the wear abnormality of the cable; When the Q value is less than the cable wear standard value A, the cable wear assessment module (8) assesses that the wear of the cable is normal.

7. The HFCT-based cable comprehensive detection interconnection terminal monitoring system according to claim 6 is characterized in that: When the cable operation evaluation module (10) identifies that abnormal words appear in the cable status data of the cable status judgment unit (6), the cable operation evaluation module (10) evaluates that the cable is not suitable for continued service; When the cable operation evaluation module (10) does not recognize that abnormal words appear in the cable status data of the cable status judgment unit (6), the cable operation evaluation module (10) judges the correlation between Q and L through covariance and adopts the following formula: Where n is the number of Q and L data; q i and l i denote the observed values ​​of Q and L respectively, and denote the means of Q and L respectively; When Cov(Q, L) is greater than or equal to a set value C, the cable operation evaluation module (10) evaluates that the cable is not suitable for continued service; When Cov(Q, L) is less than the set value C, the cable operation evaluation module (10) evaluates that the cable can continue to be in service.

8. The HFCT-based cable comprehensive detection interconnection terminal monitoring system according to claim 7 is characterized in that: The HFCT sensor (1) is a split-type HFCT high-frequency current sensor.

9. The HFCT-based cable comprehensive detection interconnection terminal monitoring system according to claim 8 is characterized in that: The cable vibration monitoring module (9) is a vibration sensor.

10. The HFCT-based cable comprehensive detection interconnection terminal monitoring system according to claim 9 is characterized in that: The signal acquisition unit (3) is a data collector.

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