Combined cable power transmission and transformation device with image processing function

Abstract

The present application belongs to the technical field of power transmission and transformation equipment, and specifically relates to a combined cable power transmission and transformation equipment with image processing, which comprises a temperature detection module, a coordinate module, a threshold comparison module, a region identification module, a position searching module, a calibration module and a control module. The temperature detection module is used for scanning the surface temperature of the circuit equipment and generating a temperature distribution image. The coordinate module is used for establishing the correlation between the temperature distribution image and the circuit equipment. The threshold comparison module is used for setting the temperature threshold of the circuit equipment, comparing the temperature of the temperature distribution image with the temperature threshold, and then marking the points exceeding the temperature threshold as temperature abnormal points. The control module of the device adjusts the current passing through the abnormal temperature region in the circuit equipment according to the current adjustment value, reduces the heat generated by the temperature abnormal region, and makes the abnormal temperature on the cable power transmission and transformation equipment return to the normal interval. Further, the frequency of alarms and the frequency of manual maintenance are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission and transformation equipment, in particular to a combined power transmission and transformation equipment with image processing. BACKGROUND

[0002] As the core carrier of efficient power transmission and distribution, the stable operation of cable power transmission and transformation equipment depends on the coordinated operation of power transmission lines, substations and power cables and other components. However, during long-term use, the equipment may cause accelerated aging of insulation materials, mechanical strength decline and other problems due to temperature abnormalities, resulting in shortened equipment life and even safety accidents such as fires in extreme cases.

[0003] Temperature abnormalities of cable power transmission and transformation equipment include short-circuit faults, overload operation and abnormal heat dissipation systems. In the traditional solution, the equipment detects temperature abnormalities and then triggers an alarm to notify professional personnel for manual repair. This passive processing method has obvious drawbacks: for some actively adjustable repairable cases (such as temperature abnormalities caused by current fluctuations or magnetic field changes), the system will still notify maintenance personnel to handle, which not only increases maintenance costs but also may cause response delays.

[0004] Therefore, we propose a combined power transmission and transformation equipment with image processing function, which actively identifies the causes of temperature abnormalities by monitoring the equipment operating state in real time and actively repairs repairable abnormalities to reduce the frequency of manual repair and improve the autonomy and safety of equipment operation. SUMMARY

[0005] The purpose of the present application is to provide a combined power transmission and transformation equipment with image processing to solve the problem of not analyzing temperature abnormal factors and actively repairing existing cable power transmission and transformation equipment as described in the background.

[0006] To achieve the above purpose, the present application provides the following technical solution: a combined power transmission and transformation equipment with image processing, comprising:

[0007] A temperature detection module for scanning the surface temperature of the circuit equipment and generating a temperature distribution image.

[0008] A coordinate module for establishing an association between the temperature distribution image and the circuit equipment.

[0009] A threshold comparison module for setting a temperature threshold for the circuit equipment and comparing the temperature of the temperature distribution image with the temperature threshold, and then marking points exceeding the temperature threshold as temperature abnormal points.

[0010] A region identification module for analyzing the temperature abnormal region where the temperature abnormal points are located and the causes of the temperature abnormal region, which include current abnormalities and magnetic field abnormalities.

[0011] The position searching module identifies the specific position of the temperature abnormal area in the circuit equipment through the correlation between the temperature distribution image and the circuit equipment.

[0012] The calibration module calculates the difference between the highest temperature in the temperature abnormal area and the highest value in the temperature threshold, and then calculates the current adjustment value through the difference.

[0013] The control module adjusts the current passing through the temperature abnormal area in the circuit equipment through the current adjustment value.

[0014] Preferably, the coordinate module establishes coordinates for the temperature distribution image and the projection image of the circuit equipment, and then makes the coordinate points in the temperature distribution image one-to-one corresponding to the projection image, thereby establishing the correlation between the temperature distribution image and the circuit equipment.

[0015] Preferably, the threshold comparison module sets the temperature threshold as a floating threshold, and when the cable power transmission and transformation equipment is in normal operation, the temperature threshold is the temperature interval of the circuit equipment in normal operation.

[0016] When the cable power transmission and transformation equipment is in abnormal operation, the temperature caused by the Joule heat generated by the current operation is calculated, and the temperature is taken as the temperature threshold, and the surface temperature of the circuit equipment is recorded. When the abnormal operation is converted to normal operation, the recorded surface temperature of the circuit equipment is taken as the temperature threshold.

[0017] Preferably, when the region identification module analyzes the cause of the temperature abnormal area, it first calculates the horizontal coordinate standard deviation and the vertical coordinate standard deviation in the temperature abnormal area, and then calculates the ratio of the horizontal coordinate standard deviation to the vertical coordinate standard deviation. When the ratio belongs to the interval of magnetic field abnormality, the cause of the temperature abnormal area is magnetic field abnormality. When the ratio belongs to the interval of current abnormality, the cause of the temperature abnormal area is current abnormality. When the ratio is outside the interval of current abnormality and the interval of magnetic field abnormality, the cause of the temperature abnormal area is current abnormality and magnetic field abnormality.

[0018] Preferably, it further comprises a re-inspection module, which calculates the heat dissipation time required by the temperature abnormal area through Newton's cooling law after the control module makes current adjustment, and when the heat dissipation time is reached, the temperature abnormal area is re-included in the measurement range.

[0019] Preferably, it further comprises an alarm module, which outputs an alarm when the re-inspection module determines that the current adjustment by the control module is invalid adjustment, and when the current temperature abnormal area is only the standby area connected to the joint of the circuit equipment.

[0020] Preferably, when the temperature abnormal area has both current abnormality and magnetic field abnormality, the weight of the cause close to the current abnormality and the magnetic field abnormality is calculated, and then the difference between the highest temperature in the temperature abnormal area and the highest value in the temperature threshold is distributed to the two causes of the current abnormality and the magnetic field abnormality through the weight. Then the current adjustment value is calculated respectively, and the larger value is taken as the real current adjustment value and brought into the control module.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1) The device calculates the difference between the temperature abnormal area and the temperature threshold through the adjustment module, and calculates the current adjustment value through the temperature difference. Then the control module adjusts the current passing through the temperature abnormal area in the circuit equipment according to the current adjustment value, reduces the heat generated by the temperature abnormal area, and makes the abnormal temperature on the cable power transmission and transformation equipment return to the normal range. Further, the alarm frequency and the manual maintenance frequency are reduced.

[0023] 2) The device identifies the cause of the temperature abnormal area through the area identification module, and then finds out whether the cause belongs to the current abnormality or the magnetic field abnormality. Then the adjustment module calculates the current adjustment value according to the different causes. Accurate identification of the cause of the temperature abnormal area is beneficial to accurate calculation of the current adjustment value. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 The figure is a schematic diagram of the modules of the present application.

[0025] Fig. 2 The figure is a schematic diagram of the flow of the present application. DETAILED DESCRIPTION

[0026] Please refer to Figs. 1-2 A combined cable power transmission and transformation equipment with image processing, comprising: a cable, a joint, a circuit equipment, a frame, a monitoring device, an image processing device and an alarm device. The cable is connected to the circuit equipment through the joint, the frame is used to fix the circuit equipment, the monitoring device, the alarm device and the image processing device, a standby power supply can be installed in the frame to provide power support for the circuit equipment, the monitoring device, the alarm device and the image processing device when power is off. The monitoring device is used to detect the circuit equipment, and the image processing device is used to process image data and control the circuit equipment.

[0027] The monitoring device comprises an infrared thermal imager, and the infrared thermal imager is integrated with a temperature detection module. The infrared thermal imager detects the surface temperature of the circuit equipment by scanning the surface of the circuit equipment (because the joint is connected to the circuit equipment, the connection between the joint and the circuit equipment is within the scanning range), and then generates a temperature distribution image.

[0028] The monitoring device is electrically connected with the image processing device, and the temperature distribution image generated by the temperature detection module is uploaded to the image processing device. The image processing device comprises a coordinate module, a threshold comparison module, a region identification module, a position searching module, a calibration module and a re-inspection module.

[0029] The coordinate module establishes coordinates for the projection image of the circuit device and the temperature distribution image, so that the coordinate points in the temperature distribution image correspond to the coordinate points of the projection image of the circuit device one by one, that is, the coordinates of each point in the temperature distribution image can find a corresponding position on the circuit device. When the temperature distribution image is abnormal, the corresponding abnormal position on the circuit device can be found through the coordinates of the abnormal point. The projection image of the circuit device and the temperature distribution image are in the same plane image, so as to facilitate the correspondence of the coordinates.

[0030] The threshold comparison module calculates the temperature interval of the circuit device when the cable power transmission and transformation device is in normal operation, and takes the temperature interval as the temperature threshold. When the cable power transmission and transformation device is abnormal, such as current channel adjustment, current passing maximum current change and the like, the surface temperature of the circuit device will also change, and this change is a non-regular change. When the current changes, the temperature caused by the Joule heat generated by the current passing through the circuit device (the thermal resistance of the resistor in the circuit device is known) is calculated, and this temperature is taken as the temperature threshold. When the cable power transmission and transformation device is locally abnormal, the current channel changes, and the changed current channel will be in normal operation, that is, the non-regular change is converted into regular operation. Therefore, it is necessary to record the surface temperature of the circuit device when the non-regular change occurs, and to take the recorded surface temperature of the circuit device as the temperature threshold when the non-regular operation is converted into regular operation.

[0031] Each coordinate point in the projection image of the circuit device has a corresponding temperature threshold, and the threshold comparison module compares the temperature of each coordinate point in the temperature distribution image with the temperature threshold of the coordinate point in the projection image of the circuit device, judges whether the temperature exceeds the temperature threshold, and if not, does not mark, and if exceeds, marks it as a temperature abnormal point.

[0032] Heat transfers from high to low, which will cause multiple temperature abnormal points to be combined together to form a temperature abnormal region. There will be a temperature abnormal region when there is a temperature abnormal point, and there will be one or more temperature abnormal regions. The coordinate points in all temperature abnormal regions are identified by the region identification module to determine whether they contain the connection position of the joint and the circuit device, and if so, the temperature abnormal region is taken as a standby region. Then, the horizontal coordinate standard deviation σ xi and the vertical coordinate standard deviation σ yi of the remaining temperature abnormal regions are calculated, and then the horizontal coordinate standard deviation σ xi and the vertical coordinate standard deviation σ yiThe ratio K is determined by the distribution of the ratio K in the existing data of the circuit device, the current anomaly, and the temperature anomaly caused by the magnetic field anomaly. When K ∈ [a, b], it represents a current anomaly, where a represents the minimum value of the ratio of the horizontal standard deviation to the vertical standard deviation when the current causes a temperature anomaly in the existing data. b represents the maximum value of the ratio of the horizontal standard deviation to the vertical standard deviation when the current causes a temperature anomaly in the existing data. When K ∈ (0, c] ∪ [d, +∞), it represents a magnetic field anomaly, where c represents the maximum value of the ratio of the horizontal standard deviation to the vertical standard deviation when the magnetic field causes a temperature anomaly in the existing data, which is less than 1. d represents the minimum value of the ratio of the horizontal standard deviation to the vertical standard deviation when the magnetic field causes a temperature anomaly in the existing data, which is greater than 1. When the ratio K is greater than 1, there is no c, and K ∈ [d, +∞] at this time. When the ratio K is less than 1, there is no d, and K ∈ (0, c] at this time.

[0033] For example, when the device circuit temperature is detected (see Table 1), the extreme values of the ratio K (K takes the last three digits after the decimal point) in the two intervals are 0.546, 0.389 and 2.569, 3.781 when the magnetic field is abnormal. The two extreme values of the ratio K in the value range are 1.329 and 0.916 when the current is abnormal. Therefore, when the ratio K ∈ [0.916, 1.329], it represents a current anomaly. When K ∈ (0, 0.546] ∪ [2.569, +∞), it represents a magnetic field anomaly.

[0034]

[0035] The position searching module confirms the temperature anomaly area in the specific facility corresponding to the circuit device through coordinate comparison. The specific facilities in the circuit device include power distribution transformers, circuit breakers, disconnectors, capacitors, etc. The area of the specific facility in the coordinate is confirmed, and then the center point coordinates (x z , y z ) of these areas are analyzed. The average value of the horizontal coordinates and the vertical coordinates of all points in the area can be calculated as the center point coordinates. Then compare the center point coordinates falling into the temperature anomaly area, i.e. x min ≤x z ≤x max , y min ≤y z ≤y max (x min represents the minimum value of the horizontal coordinate in the current temperature area, x max represents the maximum value of the horizontal coordinate in the current temperature area. y min represents the minimum value of the vertical coordinate in the current temperature area, and y maxThe maximum value of the ordinate in the current temperature region). For example: if the center point coordinate of a capacitor falls into the temperature abnormal region, it means that the capacitor is the specific facility corresponding to the temperature abnormal region in the circuit equipment. When the center point coordinate does not fall into the temperature abnormal region, first determine whether it is a temperature abnormality caused by a magnetic field anomaly. If not, an alarm is output. If yes, calculate the distance between the center point coordinate of the specific facility that causes the magnetic field anomaly (such as a power distribution transformer) and the temperature abnormal region, and take the center point coordinate with the minimum distance as the corresponding center point coordinate of the temperature abnormal region.

[0036] The highest point in the temperature abnormal region is found by the adjustment module, and then the coordinate of the point corresponding to the temperature threshold value is found, and the difference between the highest temperature and the highest value in the temperature threshold value is calculated to obtain the temperature exceeding temperature. The current adjustment value is calculated through the exceeding temperature.

[0037] When the temperature abnormal region is caused by a current anomaly, the current adjustment value is calculated by Joule's law and the heat conduction law.

[0038] ΔT = (I 初 + ΔI) 2 × R i × R zθ - I 2 初 × R i × R cθ .

[0039] Where ΔT represents the exceeding temperature.

[0040] ΔI represents the current adjustment value.

[0041] I 初 represents the highest value of the temperature threshold value corresponding to the current.

[0042] R i represents the resistance of the corresponding facility.

[0043] R zθ and R cθ represent the thermal resistance of the facility at the current temperature.

[0044] When the temperature abnormal region is caused by a magnetic field anomaly, first calculate the magnetic field strength change through the exceeding temperature, and then calculate the current adjustment value required to offset the magnetic field strength change.

[0045]

[0046] Where, represents the partial derivative of temperature with respect to time.

[0047] represents the partial derivative of magnetic field strength with respect to time.

[0048] μ0 represents the vacuum permeability.

[0049] C represents the Curie constant.

[0050] C H represents the magnetic field heat capacity (constant field heat capacity).

[0051] T represents the current temperature.

[0052] H represents the current magnetic field strength.

[0053] Since the Joule heat changes the magnetic susceptibility of the material through the thermal effect, and further affects the magnetic field distribution, it can be derived that:

[0054] ΔH≈[(T×C H ) / (μ0×C)]×ΔT。‌

[0055] Where ΔH represents the change in magnetic field strength.

[0056] Then the current adjustment value is calculated through the relationship between the change in magnetic field strength and the current.

[0057] ΔI≈(ΔH×L) / N。

[0058] Where L represents the length of the magnetic circuit.

[0059] N represents the number of turns of the coil.

[0060] The control module is integrated in the circuit device, and the current adjustment value generated by the calibration module is fed back to the control module. At the same time, the position searching module also transmits the temperature abnormal area in the specific facility corresponding to the circuit device to the control module, and the control module adjusts the current in the specific facility through the current adjustment value. The circuit device in the prior art has the functions of controlling the on-off and size of the current, which will not be described here.

[0061] In most cases, the ratio K of the horizontal standard deviation to the vertical standard deviation will fall in (0, c], [a, b], [d, +∞), where c

[0062] K∈(c,a),G=(K-c) / (a-c)×100%。

[0063] K∈(b,d), G=(d-K) / (d-b) x 100%.

[0064] The calibration module assigns the weight G in the temperature ΔT when calculating the current adjustment value.

[0065] ΔT1=ΔT x G. ΔT2=ΔT x (1-G).

[0066] Then ΔT1 is substituted into the formula of the temperature abnormal area caused by current abnormality to calculate ΔI1. ΔT2 is substituted into the formula of the temperature abnormal area caused by magnetic field abnormality to calculate ΔI2. Then the size of ΔI1 and ΔI2 is compared, and the larger one is taken as the current adjustment value.

[0067] When the control module makes the current adjustment, the recheck module calculates the heat dissipation time required by the temperature abnormal area through Newton's cooling law. When the heat dissipation time reaches, the temperature abnormal area is re-included in the measurement range, that is, the area identification module judges again whether the area is a temperature abnormal area. During the heat dissipation period, the recheck module also compares the temperature of the temperature abnormal area at different times to detect whether the temperature gradually decreases. If the temperature gradually decreases, it is determined that this adjustment is effective. If the temperature does not decrease, it is determined that the adjustment is invalid.

[0068] The alarm module is integrated in the alarm device. When the recheck module determines that the adjustment of the control module to the current is invalid, it outputs an abnormal signal to the alarm device, and the alarm module outputs an alarm. When the area identification module determines the standby area containing the joint and the circuit device, if the current temperature abnormal area is only the standby area, it outputs an abnormal signal to the alarm device, and the alarm module outputs an alarm. If there is other temperature abnormal area, the area identification module transmits a waiting signal. When the recheck module detects the heat dissipation, if the standby area does not reduce the temperature, the recheck module outputs an abnormal signal to the alarm device, and the alarm module outputs an alarm.

Claims

1. A combined cable power transmission and transformation equipment with image processing capabilities, characterized in that, include: The temperature detection module is used to scan the surface temperature of circuit equipment and generate a temperature distribution image. The coordinate module is used to establish the association between the temperature distribution image and the circuit device. The coordinate module establishes coordinates for the temperature distribution image and the projected image of the circuit device, and then makes the coordinate points in the temperature distribution image correspond one-to-one with the projected image, thereby establishing the association between the temperature distribution image and the circuit device. The threshold comparison module is used to set the temperature threshold of the circuit equipment, compare the temperature of the temperature distribution image with the temperature threshold, and then mark the points that exceed the temperature threshold as temperature anomalies. The region identification module is used to analyze the temperature anomaly region where the temperature anomaly point is located, as well as the causes of the temperature anomaly region, including current anomalies and magnetic field anomalies. When analyzing the causes of the temperature anomaly region, the region identification module first calculates the x-coordinate standard deviation and y-coordinate standard deviation of the temperature anomaly region, and then calculates the ratio of the x-coordinate standard deviation to the y-coordinate standard deviation. When this ratio belongs to the interval where the magnetic field anomaly is located, the cause of the temperature anomaly region is a magnetic field anomaly; when this ratio belongs to the interval where the current anomaly is located, the cause of the temperature anomaly region is a current anomaly; when this ratio is outside the intervals where the current anomaly is located and the magnetic field anomaly is located, the cause of the temperature anomaly region is both a current anomaly and a magnetic field anomaly. The location search module identifies the specific location of abnormal temperature areas within the circuit equipment by correlating temperature distribution images with the circuit equipment. The calibration module is used to calculate the difference between the highest temperature in the temperature anomaly region and the highest value in the temperature threshold, and then calculate the current adjustment value based on this difference; The control module regulates the current passing through abnormal temperature zones in the circuit equipment by adjusting the current regulation value.

2. A combined cable power transmission and transformation equipment with image processing according to claim 1, characterized in that: The temperature threshold set by the threshold comparison module is a floating threshold. When the cable transmission and transformation equipment is running normally, the temperature range of the circuit equipment during normal operation is used as the temperature threshold. When cable power transmission and transformation equipment is operating under non-standard conditions, the temperature caused by Joule heating generated by the current operation is calculated and used as the temperature threshold. The surface temperature of the circuit equipment is also recorded. When this non-standard operation is converted to regular operation, the surface temperature of the circuit equipment is recorded as the temperature threshold.

3. A combined cable power transmission and transformation equipment with image processing according to claim 1, characterized in that: It also includes a retesting module. After the control module adjusts the current, the retesting module calculates the heat dissipation time required for the temperature abnormal area using Newton's law of cooling. Once the heat dissipation time is reached, the temperature abnormal area is included back in the measurement range.

4. A combined cable power transmission and transformation equipment with image processing according to claim 3, characterized in that: It also includes an alarm module, which outputs an alarm when the retest module determines that the control module’s adjustment of the current is invalid, and when the current abnormal temperature area is only a spare area with a connector and circuit equipment connected.

5. A combined cable power transmission and transformation equipment with image processing according to claim 1, characterized in that: When the causes of temperature anomalies are both current anomalies and magnetic field anomalies, the weights of the causes close to the current anomalies and magnetic field anomalies are calculated. Then, the difference between the highest temperature in the temperature anomaly area and the highest value in the temperature threshold is assigned to the two causes of current anomalies and magnetic field anomalies based on the weights. Subsequently, the current adjustment value is calculated separately, and the larger value is used as the actual current adjustment value and fed into the control module.

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