A switch cabinet internal discharge simulation device

Abstract

This utility model relates to a discharge simulation device inside a switchgear. The device includes a digitally controlled voltage regulator, a transformer, an electrode controller, a coupling capacitor, a detection impedance, and multiple discharge model components, as well as an external PC. The discharge model components are fixed inside the switchgear by a bracket, and the discharge models are also fixed to the bracket by stepper motors. The multiple discharge model components are positioned relative to the copper busbars inside the switchgear. The digitally controlled voltage regulator is connected to the low-voltage input of the transformer, and the high-voltage output of the transformer is connected to the lower busbar of the switchgear. One end of the coupling capacitor is connected to the high-voltage output of the transformer, and the other end is connected to a partial discharge detector via the detection impedance. The partial discharge detector is connected to the PC, which controls actions such as voltage boosting, voltage bucking, and discharge model switching. This utility model improves the efficiency of simulated discharge tests inside switchgear, reduces the risk of human error, and increases the accuracy of the tests.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, specifically relating to a discharge simulation device inside a switchgear. Background Technology

[0002] High-voltage switchgear is a crucial piece of equipment in power systems, involved in power distribution, circuit control, power measurement, and monitoring. It is used extensively across a wide geographical area in complex operating environments, making it a device with a high rate of insulation failures in distribution networks. During operation, insulation degradation due to aging, moisture, contamination, or poor electrical connections can easily lead to discharge faults. Partial discharge detection is a key method for detecting insulation defects in switchgear.

[0003] Existing methods for simulating discharge faults in switchgear equipment primarily utilize defects in the existing structure of decommissioned switchgear, or artificially create insulation defects, or suspend copper wires from the busbars of new switchgear equipment. In these methods, discharge control, voltage control, and partial discharge detection are all implemented manually. The discharge type, magnitude, and occurrence and disappearance are all uncontrollable, and the simulated discharge types are limited. Furthermore, existing discharge simulation methods are cumbersome, labor-intensive, lack strong interoperability, have imprecise control, and produce inaccurate data, significantly impacting the convenience and accuracy of switchgear discharge simulation. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a device for simulating internal discharge in switchgear.

[0005] This utility model includes a digitally controlled voltage regulating power supply, a transformer, an electrode controller, a coupling capacitor, a detection impedance and multiple discharge model components installed in a switch cabinet, as well as an external PC terminal.

[0006] The digitally controlled voltage regulator is connected to the low-voltage input terminal of the transformer and is controlled by an external PC. The high-voltage output terminal of the transformer is connected to the lower busbar of the switchgear. One end of the coupling capacitor is connected to the high-voltage output terminal of the transformer, and the other end of the coupling capacitor is connected to a partial discharge detector through impedance detection. The partial discharge detector detects the discharge type and discharge magnitude data in real time and is connected to an external PC.

[0007] The discharge model assembly includes a support frame on which multiple discharge models are mounted. The discharge models are fixedly connected to the support frame via stepper motors.

[0008] Multiple discharge model components are arranged relative to the busbar copper bus in the switch cabinet; the head of the discharge model is arranged corresponding to the busbar copper bus, and the tail is connected to the rear panel of the switch cabinet and grounded; the electrode controller is connected to an external PC terminal, and the electrode controller is connected to a stepper motor to control the horizontal or vertical movement of the discharge model.

[0009] Furthermore, if a three-phase transformer is used, the three-phase output terminal on the high-voltage side of the transformer is connected to the three-phase busbar copper busbar of the lower cabinet of the switchgear; if a single-phase transformer is used, the single-phase output terminal on the high-voltage side of the transformer is connected to one phase busbar copper busbar of the lower cabinet of the switchgear, and the three-phase busbar copper busbar of the upper cabinet of the switchgear is short-circuited.

[0010] Furthermore, the multiple discharge model components are configured corresponding to the upper cabinet three-phase busbar copper busbar and / or the lower cabinet three-phase busbar copper busbar and / or the middle cabinet three-phase busbar copper busbar of the switchgear.

[0011] Furthermore, the multiple discharge models are one or more of the following: tip discharge model, suspension discharge model, air gap discharge model, and surface discharge model.

[0012] The PC has centralized control software installed inside. The PC is connected to the CNC voltage regulator, which is connected to the low-voltage side of the transformer. The PC controls the switching of the CNC voltage regulator and controls the step-up and step-down amplitude of the transformer through the CNC voltage regulator. The PC is also connected to the electrode controller, which controls the movement of the discharge model. The PC is connected to the partial discharge detector, which processes the partial discharge signal received by the partial discharge detector. The PC sends control commands to the CNC voltage regulator and the electrode controller, and the CNC voltage regulator and the electrode controller feed back the execution data to the PC. The electrode controller controls the rotation direction of the stepper motors connected to each discharge model and controls the opening and closing switching of each discharge model.

[0013] This utility model 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 switchgear discharge simulation process. It realizes the simulation of multiple discharge types, reduces workload, reduces human error, and improves the convenience and accuracy of switchgear discharge simulation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0015] Figure 2 This is a schematic diagram of the discharge model component structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the discharge model control device;

[0017] Figure 4 This is a schematic diagram of the control system. Detailed Implementation

[0018] like Figure 1 As shown, a discharge simulation device inside a switchgear is provided in an existing switchgear, which includes a digitally controlled voltage regulating power supply 1, a transformer 2, an electrode controller 3, a coupling capacitor, a detection impedance (not shown in the figure), and multiple discharge model components 4. The size and type of the simulated discharge in the switchgear are controlled by a PC.

[0019] The CNC voltage regulating power supply 1 is connected to the low-voltage input terminal of transformer 2, and is controlled by an external PC (not shown in the figure). In this embodiment, a single-phase transformer is used. The high-voltage single-phase output terminal of transformer 2 is connected to one phase busbar 51 of the lower cabinet of the switchgear, and the three-phase busbar 52 of the upper cabinet is short-circuited by conductor 6. If a three-phase transformer is used, the three-phase output of the high-voltage side of the transformer is connected to the corresponding three-phase busbar of the lower cabinet of the switchgear.

[0020] One end of the coupling capacitor is connected to the high-voltage output terminal of transformer 2, and the other end of the coupling capacitor is connected to the partial discharge detector (not shown in the figure) through the detection impedance. The partial discharge detector detects the discharge type and discharge size data in real time. The partial discharge detector is connected to an external PC.

[0021] like Figure 2 As shown, the specific structure of the discharge model component 4 is as follows: it includes a bracket 41, on which multiple discharge models 42 are arranged in parallel. The discharge models 42 are fixed to the bracket 41 by a stepper motor 43, and the bracket 41 is fixed inside the switch cabinet. The multiple discharge models are one or more of the following: tip discharge model, floating discharge model, air gap discharge model, and surface discharge model. One or more discharge models can be set on a single bracket, or one or more discharge models can be set on a single bracket.

[0022] like Figure 3 As shown, the lead screw 44 of the stepper motor 43 is threadedly connected to the slider 45, the slider 45 is movably connected to the guide rod 46, the slider 45 can slide up and down along the guide rod 46, and the slider 45 is connected to the discharge model 42 through the connecting rod 47 to control the linear motion of the discharge model 42.

[0023] Multiple discharge model components 4 are arranged relative to the busbar copper bus in the switchgear (the upper cabinet three-phase busbar copper bus and / or the lower cabinet three-phase busbar copper bus and / or the middle cabinet three-phase busbar copper bus). In this embodiment, the discharge model components 4 arranged in the upper part of the cabinet correspond to the conductor 6 connecting the upper cabinet three-phase busbar copper bus 52, and the head of each discharge model 42 is set with a copper post on the conductor 6; the discharge model components 4 arranged in the middle part of the cabinet correspond to the middle cabinet three-phase busbar copper bus 53, and the head of each discharge model 42 is set with a copper post on the middle cabinet three-phase busbar copper bus 53; the discharge model components 4 arranged in the lower part of the cabinet correspond to the lower cabinet three-phase busbar copper bus 51, and the head of each discharge model 42 is set with a copper post on the lower cabinet three-phase busbar copper bus 51. The tail of all discharge models 42 is connected to the rear plate of the switchgear and grounded. All stepper motors 43 are connected to the electrode controller 3, and the electrode controller is connected to an external PC. The PC controls each stepper motor 43 via the electrode controller 3, which in turn controls the horizontal or vertical movement of each discharge model 42.

[0024] like Figure 4 As shown, the PC-based host computer has centralized control software installed inside. The PC is connected to the CNC voltage regulator to control its switching, boosting, and bucking. It is also connected to the electrode controller to control the movement of the discharge model. Finally, it is connected to the partial discharge detector to process the partial discharge signal received by the detector. The PC-based host computer's centralized control software allows for setting and inputting eight parameter combinations: "Manual On," "Manual Off," "Boost," "Buck," "Voltage Regulation Amplitude," "Target Voltage," "Partial Discharge Measurement," and "Video Monitoring." The PC is connected to a router via fiber optic cable. The router's first output is connected to the partial discharge detector via a network cable. The router's second output is connected to the power supply motor control board via a network cable. The power supply motor control board is wirelessly connected to the CNC voltage regulator at one end and wirelessly connected to the electrode controller at the other. The external PC acts as the host computer, and the power supply motor control board acts as the slave computer. The power supply motor control board receives control commands from the PC and transmits them to the CNC voltage regulator and electrode controller, while simultaneously feeding back execution data to the PC. The electrode controller controls the rotation direction of the stepper motor connected to each discharge model, thereby controlling the forward / backward or upward / lowering switching of each discharge model. A digitally controlled adjustable power supply is connected to the low-voltage side of the transformer. The PC-based host computer controls the transformer's voltage boost and buck amplitude via the power supply, with adjustable steps selectable from 1-10V.

[0025] By integrating the CNC voltage regulator and electrode controller into the switch cabinet, there is no need to rewire for each test. Actions such as voltage boosting / debossing and discharge model switching also do not require manual operation each time, and there is no need for human interference. The integrated control system automatically completes the actions such as voltage boosting / debossing and discharge model switching upon receiving the instruction from the host computer on the PC. This improves the convenience and efficiency of simulated discharge tests inside the switch cabinet, reduces the test risks caused by human error, and increases the accuracy of the test.

[0026] The specific method for simulating discharge detection using the internal discharge simulation device of the switchgear is as follows:

[0027] Step (1) Discharge Model Selection: On the PC-based host computer control platform, select the "manual closing" parameter for the discharge model of the type being tested. The PC-based host computer sends a specified discharge model movement command signal to the router. The power supply motor control board receives the digital signal of the motor movement command forwarded by the router and converts it into a PWM signal, which is then output to the electrode controller. The electrode controller executes the PWM signal to drive the corresponding motor screw to rotate clockwise, thereby causing the discharge model to close the high-voltage bus.

[0028] Step (2) Boosting Operation: First, determine the discharge initiation voltage generated by partial discharge. Input any step from 1V to 10V in the "Voltage Adjustment Amplitude" parameter on the PC host computer control platform. Select the "Boost" parameter multiple times. The PC host computer sends a step-by-step boosting command signal to the router. The power supply motor control board receives the step-by-step boosting digital command signal forwarded by the router and converts it into a PWM signal, which is then sent to the CNC voltage regulator. The CNC voltage regulator executes the received PWM signal to precisely and slowly adjust the boost value. When the discharge signal first appears on the "Partial Discharge Measurement" parameter interface of the PC host computer, the currently displayed voltage value is the discharge initiation voltage. After determining the discharge initiation voltage, for each subsequent test of the same discharge model, input the determined initiation voltage in the "Target Voltage" parameter on the PC host computer control platform, and then select the "Boost" parameter. The PC host computer sends a boosting command signal to the "Target Voltage," and the CNC voltage regulator automatically boosts the voltage to the discharge initiation voltage, improving efficiency and boosting accuracy.

[0029] Step (3) Automatic detection of partial discharge phase amplitude in switchgear: On the PC-side host computer centralized control platform, input any step of 1V-10V for the "Voltage Adjustment Amplitude" parameter, input the starting voltage for the "Target Voltage" parameter, and then select the "Automatic Partial Discharge Measurement" parameter. The PC-side host computer simultaneously sends a boost command signal to the CNC boost power supply and a partial discharge acquisition signal to the partial discharge detector. After the CNC boost power supply boosts to the starting voltage, it continues to boost the voltage in selected steps based on the starting voltage, maintaining each voltage amplitude for 10s. At the same time, the partial discharge detector collects the discharge measurement data corresponding to each voltage level and feeds it back to the PC-side host computer. When the PC-side host computer centralized control platform detects that a partial discharge signal appears within a fixed phase range of each 20ms AC voltage cycle within a 10s time period at a certain current voltage level, it sends a stop boost command signal to the CNC boost power supply. The discharge measurement data collected at this time displayed on the PC-side host computer centralized control platform is the stable discharge spectrum data, which is used to determine the discharge type.

[0030] Step (4) Voltage reduction operation: First, determine the discharge extinction voltage inside the switch cabinet. Input any step of 1V-10V in the "Voltage Adjustment Amplitude" parameter on the PC host computer control platform. Select the "Voltage Reduction" parameter multiple times. The PC host computer sends a step-by-step voltage reduction command signal to the router. The power supply motor control board receives the step-by-step voltage reduction digital command signal forwarded by the router and converts it into a PWM signal, which is then sent to the CNC voltage regulator. The CNC voltage regulator executes the received PWM signal to precisely and slowly adjust the voltage reduction value. When the "Partial Discharge Measurement" parameter interface on the PC host computer loses the discharge signal for the first time, the currently displayed voltage value is the discharge extinction voltage. After determining the discharge extinction voltage, each subsequent test of the same discharge model will input the determined extinction voltage in the "Target Voltage" parameter on the PC host computer control platform, and then select the "Voltage Reduction" parameter. The PC host computer will send a step-up / step-down command signal to the "Target Voltage". The CNC voltage regulator will automatically reduce the voltage to the discharge extinction voltage, improving efficiency and the accuracy of voltage increase.

[0031] Step (5) Disconnect the current discharge model under test and switch to the next different type of discharge model; after the voltage drops to 0V, select the "manual separation" parameter for the current discharge model under test on the PC host computer control platform. The PC host computer sends a specified discharge model movement command signal to the router. The power supply motor control board receives the digital signal of the motor movement command forwarded by the router and converts it into a PWM signal output to the electrode controller. The electrode controller executes the PWM signal to drive the motor screw to rotate counterclockwise, causing the discharge model to separate from the high-voltage bus. Select the next test model on the PC host computer control platform and repeat the operation until the test of each discharge model is completed.

Claims

1. A device for simulating internal discharge of a switchgear, characterized in that: It includes a digitally controlled voltage regulating power supply, transformer, electrode controller, coupling capacitor, detection impedance and multiple discharge model components installed in the switch cabinet, as well as an external PC terminal; The digitally controlled voltage regulator is connected to the low-voltage input terminal of the transformer and is controlled by an external PC. The high-voltage output terminal of the transformer is connected to the lower busbar of the switchgear. One end of the coupling capacitor is connected to the high-voltage output terminal of the transformer, and the other end of the coupling capacitor is connected to the partial discharge detector through the detection impedance. The partial discharge detector detects the discharge type and discharge magnitude data in real time and is connected to an external PC. The discharge model assembly includes a support frame on which multiple discharge models are mounted. The discharge models are fixedly connected to the support frame via stepper motors. Multiple discharge model components are arranged relative to the busbar copper bus in the switch cabinet; the head of the discharge model is arranged corresponding to the busbar copper bus, and the tail is connected to the rear panel of the switch cabinet and grounded; the electrode controller is connected to an external PC terminal, and the electrode controller is connected to a stepper motor to control the horizontal or vertical movement of the discharge model.

2. The internal discharge simulation device for switchgear as described in claim 1, characterized in that: If a three-phase transformer is used, the three-phase output terminal on the high-voltage side of the transformer is connected to the three-phase busbar copper busbar of the lower cabinet of the switchgear; if a single-phase transformer is used, the single-phase output terminal on the high-voltage side of the transformer is connected to one phase busbar copper busbar of the lower cabinet of the switchgear, and the three-phase busbar copper busbar of the upper cabinet of the switchgear is short-circuited.

3. The internal discharge simulation device for switchgear as described in claim 1, characterized in that: The multiple discharge model components are configured corresponding to the upper cabinet three-phase busbar copper busbar and / or the lower cabinet three-phase busbar copper busbar and / or the middle cabinet three-phase busbar copper busbar of the switchgear.

4. The internal discharge simulation device for switchgear as described in claim 1, characterized in that: Multiple discharge models are one or more of the following: tip discharge model, suspension discharge model, air gap discharge model, and surface discharge model.

5. A switchgear internal discharge simulation device as described in claim 1, 2, 3 or 4, characterized in that: The PC has centralized control software installed inside. The PC is connected to the CNC voltage regulator, which is connected to the low-voltage side of the transformer. The PC controls the switching of the CNC voltage regulator and controls the step-up and step-down amplitude of the transformer through the CNC voltage regulator. The PC is also connected to the electrode controller, which controls the movement of the discharge model. The PC is connected to the partial discharge detector, which processes the partial discharge signal received by the partial discharge detector. The PC sends control commands to the CNC voltage regulator and the electrode controller, and the CNC voltage regulator and the electrode controller feed back the execution data to the PC. The electrode controller controls the rotation direction of the stepper motors connected to each discharge model and controls the opening and closing switching of each discharge model.

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