An integrated control power cable partial discharge simulation device

Abstract

The utility model relates to a kind of integrated control's power cable partial discharge simulation device.The utility model includes simulation partial discharge cylinder, control cabinet and partial discharge model component.The left and right side cylinder body of simulation partial discharge cylinder is connected with middle cylinder body, and the left and right side cylinder body is respectively provided with electrically conductive pole, and electrically conductive disc is provided in middle cylinder body, and electrically conductive disc is provided with electrically conductive column, and the end of two electrically conductive poles is connected with electrically conductive column.Control cabinet is provided with numerical control voltage regulating power supply, transformer, electrode controller, coupling capacitor, detection impedance and partial discharge detector.Partial discharge model component includes multiple partial discharge models arranged in parallel, and is controlled telescopic by respective stepping motor, and partial discharge model is set corresponding electrically conductive disc, when the head of partial discharge model touches electrically conductive disc, partial discharge is generated.The utility model realizes multiple discharge type simulation, reduces workload and artificial operation failure, and improves the convenience and accuracy of power cable discharge simulation.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology and relates to an integrated control device for simulating partial discharge of power cables. Background Technology

[0002] In the operation and maintenance of power cables, partial discharge detection is not only an important measure but also an effective method for discovering latent defects and hidden dangers. Given the diversity of partial discharge types and the complexity of their properties, realistic and dynamic simulation of partial discharge in power cables is helpful for experimental research on partial discharge in power cables, partial discharge training, and improving the accuracy and effectiveness of partial discharge identification in power cables.

[0003] Existing methods for simulating partial discharge in power cables primarily utilize existing defects in decommissioned cables or artificially create insulation defects (such as air gaps or scratches). These methods are costly, time-consuming, and cannot simulate discharges at cable terminations or intermediate joints separately. In these existing fault simulation methods, discharge control, voltage control, and partial discharge detection are all implemented manually. The discharge type, magnitude, and occurrence and disappearance of discharges cannot be precisely controlled, and the simulated discharge types are limited. Existing discharge simulation methods are cumbersome, labor-intensive, lack strong linkage, have imprecise control, and produce inaccurate data, significantly impacting the convenience and accuracy of partial discharge simulation in power cables. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an integrated control device for simulating partial discharge in power cables.

[0005] This utility model includes a simulated partial discharge cylinder, a control cabinet, and a partial discharge model assembly; the simulated partial discharge cylinder is disposed above the control cabinet, and the partial discharge model assembly is disposed on the simulated partial discharge cylinder.

[0006] The simulated partial discharge cylinder comprises three coaxially arranged parts: a left cylinder, a middle cylinder, and a right cylinder. Both the left and right cylinders are closed at one end by an end cap, with the other end connected to the middle cylinder. Cable connectors are provided on both end caps. Conductive rods are installed inside the left and right cylinders, respectively, with the two rods aligned on the same straight line. One end of each rod is connected to a corresponding cable connector, and the other ends are positioned opposite each other within the middle cylinder. A conductive disk is installed within the middle cylinder, and conductive posts are fixedly mounted on the conductive disk, perpendicular to the conductive rods. The ends of both conductive rods are connected to the conductive posts.

[0007] The control cabinet contains a digitally controlled voltage regulator, a transformer, an electrode controller, a coupling capacitor, a detection impedance, and a partial discharge detector. The digitally controlled voltage regulator is connected to the low-voltage input of the transformer and is controlled by an external PC. One end of the coupling capacitor is connected to the high-voltage output of the transformer, and the other end is connected to the partial discharge detector via the detection impedance. The partial discharge detector detects the discharge type and magnitude in real time and is connected to the external PC. The electrode controller is connected to the PC, and the PC sends control signals to the electrode controller to control the partial discharge model components. The high-voltage output of the transformer is connected to a conductive post via a cable.

[0008] The partial discharge model assembly includes multiple partial discharge models arranged in parallel. Each partial discharge model is controlled to extend and retract by its own stepper motor. The multiple partial discharge models are set with corresponding conductive disks, and their movement direction is perpendicular to the plane of the conductive disks. When the head of a partial discharge model touches the conductive disk, a partial discharge is generated.

[0009] During partial discharge detection, a high voltage is applied to the detection point of the power cable under test, and a partial discharge model is used to simulate partial discharge at the detection point. The type and magnitude of the simulated partial discharge are integrated and controlled via an external PC. The partial discharge detector receives the partial discharge signal and transmits it to the PC. The detection point is either the terminal joint or the intermediate joint of the cable under test. To simulate partial discharge at a cable terminal joint, a high voltage is applied to the end of one cable, and the partial discharge model simulates partial discharge at that end, with the cable's shield and armor layers grounded. To simulate partial discharge at an intermediate joint, one end of two cables is connected, and a high voltage is applied to the connection point, simulating partial discharge at the connection point, with both cables' shields and armor layers grounded. The high voltage is applied via a digitally controlled voltage regulator and a transformer. The PC controls the switching of the digitally controlled voltage regulator and, through it, controls the voltage increase and decrease of the transformer. The PC controls the linear movement of the partial discharge model; when the head of the partial discharge model touches the detection point, a partial discharge occurs.

[0010] This invention integrates the control of the rise and fall of the test voltage, the start, stop and switch of the fault discharge model, and the detection of partial discharge, making the discharge size, discharge type, and the generation and disappearance of discharge controllable in the process of power cable partial discharge simulation. It enables the simulation of multiple discharge types, reduces workload, reduces human error, and improves the convenience and accuracy of power cable discharge simulation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure and the interior of the discharge cylinder of this utility model; Figure 2 This is a schematic diagram of the overall structure and internal structure of the control cabinet of this utility model; Figure 3 This is a schematic diagram of the overall structure and internal components of the partial discharge model of this utility model; Figure 4 This is a schematic diagram of the discharge model control device in the utility model. Detailed Implementation

[0012] like Figure 1 , 2 As shown in Figure 3, an integrated control power cable partial discharge simulation device includes a simulated partial discharge cylinder 1, a control cabinet 2, and a partial discharge model assembly 3. The simulated partial discharge cylinder 1 is positioned above the control cabinet 2, and the partial discharge model assembly 3 is positioned on the simulated partial discharge cylinder 1.

[0013] like Figure 1 The simulated partial discharge cylinder 1 comprises three coaxially arranged parts: a left cylinder 11, a middle cylinder 12, and a right cylinder 13. Both the left and right cylinders 11 and 13 are closed at one end by an end cap 14, with the other end connected to the middle cylinder 12. Cable connectors 15 are respectively provided on the two end caps 14. Conductive rods 16 are respectively installed inside the left and right cylinders 11 and 13, with the two conductive rods 16 located on the same straight line. One end of each conductive rod 16 is connected to the corresponding cable connector 15, and the other ends are positioned opposite each other inside the middle cylinder 12. A support frame 17 is provided inside the simulated partial discharge cylinder 1, and the two conductive rods 16 are fixed inside the cylinder 1 via the support frame 17. A conductive disk 18 is provided inside the middle cylinder 12, and conductive posts 19 are fixedly installed on the conductive disk 18. The conductive posts 19 are perpendicular to the conductive rods 16, and the ends of both conductive rods 16 are connected to the conductive posts 19.

[0014] like Figure 2 The control cabinet 2 includes a cabinet 21, which houses a digitally controlled voltage regulator 22, a transformer 23, an electrode controller 24, a coupling capacitor 25, a detection impedance 26, and a partial discharge detector 27. The digitally controlled voltage regulator 22 is connected to the low-voltage input of the transformer 23 and is controlled via an external PC (not shown in the figure). One end of the coupling capacitor 25 is connected to the high-voltage output of the transformer 23, and the other end is connected to the partial discharge detector 27 via the detection impedance 26. The partial discharge detector 27 detects the discharge type and magnitude in real time and is connected to the external PC. The electrode controller 24 is connected to the PC, and the PC sends control signals to the electrode controller 24 to control the partial discharge model component 3. The high-voltage output of the transformer 23 is connected to the conductive post 19 via a cable, enabling pressure application to the conductive post.

[0015] like Figure 3The partial discharge model assembly 3 includes a model cylinder 31, which is fixedly mounted on the central cylinder 12 and forms a three-way connection with the central cylinder 12. A model support 32 is installed inside the model cylinder 31, and multiple partial discharge models 33 are arranged parallel to each other on the model support 32. Each partial discharge model 33 is fixed to the model support 32 via its corresponding stepper motor 34, and the model support 32 is fixed inside the model cylinder 31. The multiple partial discharge models are one or more of the following: tip discharge model, suspension discharge model, air gap discharge model, and surface discharge model. The stepper motors 34 are connected to an electrode controller 24, and the PC controls each stepper motor 34 through the electrode controller 24, thereby controlling the extension and retraction of each partial discharge model 33.

[0016] like Figure 4 The lead screw 35 of the stepper motor 34 is threadedly connected to the slider 36, which is movably connected to the guide rod 37. The slider 36 can slide up and down along the guide rod 37. The slider 36 is connected to the partial discharge model 33 through the connecting rod 38, controlling the linear movement of the partial discharge model 33. The head of the partial discharge model 33 is correspondingly positioned to the conductive disk 18, and the direction of movement of the partial discharge model 33 is perpendicular to the plane of the conductive disk 18.

[0017] The PC-based host computer has centralized control software installed. The PC is connected to a CNC power supply, controlling its switching and, through it, the voltage boost and buck adjustments of the transformer. The PC is also connected to an electrode controller, which controls the movement of the partial discharge models. Furthermore, the PC is connected to a partial discharge detector, processing the partial discharge signals received by the detector. The PC sends control commands to the CNC power supply and electrode controller, which in turn send execution data back to the PC. The electrode controller controls the rotation direction of the stepper motors connected to each partial discharge model, controlling the opening and closing of each model.

[0018] The specific testing steps are as follows: Step (1) Cable connection: If it is necessary to simulate partial discharge at the intermediate joint of the cable, connect one end of the two cables to be tested to the two cable joints respectively, and ground the shielding layer and armor layer of the cable; if it is necessary to simulate partial discharge at the terminal joint of the cable, connect one end of the cable to be tested to one cable joint, and ground the shielding layer and armor layer of the cable.

[0019] Step (2) Partial discharge type simulation: Select different types of partial discharge models (surface, suspension, tip or air gap) as test discharge models on the PC host computer's centralized control platform to simulate the discharge of power cables. For example, select the "manual closing" parameter of the tip discharge model. The PC host computer sends a command to the electrode controller. The electrode controller executes the PWM signal to drive the stepper motor screw corresponding to the tip discharge model to rotate clockwise, which drives the tip discharge model to move forward. When the head of the tip discharge model touches the conductive disk, it is connected to the conductive rod, generating partial discharge at the tip of the cable.

[0020] Step (3) Partial Discharge Size Control: Input any step of 1V-10V in the "Voltage Adjustment Amplitude" parameter on the PC host computer control platform, and select the "Boost" parameter multiple times. The PC host computer sends a step-by-step boost command signal to the CNC voltage regulator. The CNC voltage regulator executes the received PWM signal to precisely and slowly adjust the boost value, accurately controlling the size of the partial discharge in the power cable.

[0021] Step (4) Switching the simulated partial discharge model: After selecting the "Step down to 0V" parameter on the PC-based host computer control platform, select the "Manually split" parameter for the current test discharge model on the PC-based host computer control platform. The PC-based host computer sends a command to the electrode controller, which executes a PWM signal to drive the stepper motor screw corresponding to the test discharge model to rotate counterclockwise, causing the test discharge model to move backward and separate from the conductive disk. Switch to the next test discharge model on the PC-based host computer control platform and repeat the operation to complete the switching of the simulated partial discharge model type.

Claims

1. An integrated control device for simulating partial discharge in power cables, characterized in that: It includes a simulated partial discharge cylinder, a control cabinet, and a partial discharge model assembly; the simulated partial discharge cylinder is positioned above the control cabinet, and the partial discharge model assembly is positioned on the simulated partial discharge cylinder. The simulated partial discharge cylinder comprises three coaxially arranged parts: a left cylinder, a middle cylinder, and a right cylinder. Both the left and right cylinders are closed at one end by an end cap, with the other end connected to the middle cylinder. Cable connectors are provided on both end caps. Conductive rods are installed inside the left and right cylinders, respectively, with the two rods aligned on the same straight line. One end of each rod is connected to a corresponding cable connector, and the other ends are positioned opposite each other within the middle cylinder. A conductive disk is installed within the middle cylinder, and conductive posts are fixedly mounted on the conductive disk, perpendicular to the conductive rods. The ends of both conductive rods are connected to the conductive posts. The control cabinet contains a digitally controlled voltage regulator, a transformer, an electrode controller, a coupling capacitor, a detection impedance, and a partial discharge detector. The digitally controlled voltage regulator is connected to the low-voltage input of the transformer and is controlled by an external PC. One end of the coupling capacitor is connected to the high-voltage output of the transformer, and the other end is connected to the partial discharge detector via the detection impedance. The partial discharge detector detects the discharge type and magnitude in real time and is connected to the external PC. The electrode controller is connected to the PC, and the PC sends control signals to the electrode controller to control the partial discharge model components. The high-voltage output of the transformer is connected to a conductive post via a cable. The partial discharge model assembly includes multiple partial discharge models arranged in parallel. Each partial discharge model is controlled to extend and retract by its own stepper motor. The multiple partial discharge models are set with corresponding conductive disks, and their movement direction is perpendicular to the plane of the conductive disks. When the head of a partial discharge model touches the conductive disk, a partial discharge is generated.

2. The power cable partial discharge simulation device as described in claim 1, characterized in that: The partial discharge model assembly also includes a model cylinder, which is fixedly mounted on the central cylinder and connected to the central cylinder in a three-way configuration. A model support is installed inside the model cylinder, and each partial discharge model is fixed to the model support via its corresponding stepper motor. The model support is fixed inside the model cylinder. The stepper motor is connected to an electrode controller, and the PC controls each stepper motor through the electrode controller, thereby controlling the extension and retraction of each partial discharge model.

3. The power cable partial discharge simulation device as described in claim 1, characterized in that: Multiple partial discharge models are one or more of the following: tip discharge model, suspension discharge model, air gap discharge model, and surface discharge model.

4. The power cable partial discharge simulation device as described in claim 1, characterized in that: The simulated partial discharge cylinder is equipped with a support frame, and two conductive rods are fixed inside the simulated partial discharge cylinder through the support frame.

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