Generation and detection device for partial discharge signal
By using a device to generate partial discharge signals in the power metal cabinet, AC power supply and magnetic coupling technology, the danger and high cost problems of high-voltage discharge experiments are solved, and the safe, low-cost and adjustable generation of partial discharge signals is achieved to meet different monitoring needs.
Patent Information
- Application Number
- CN202422680293.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-04
AI Technical Summary
Existing high-voltage discharge experiments have problems when generating partial discharge signals, such as high risk, high cost, strict environmental requirements, inability to accurately adjust in real time, and weak signals.
A partial discharge signal generation and detection device is designed, which includes a partial discharge signal generator and a detection sensor. Using components such as an AC power supply, a step-up transformer, a full-wave rectifier circuit, a lighter, and metal electrodes, a high-voltage and high-frequency signal is generated through magnetic coupling to generate a partial discharge signal inside a power metal cabinet. A Bluetooth module is used to remotely adjust the amplitude and frequency.
It achieves safe, low-cost and continuous generation of partial discharge signals, and can adjust the signal amplitude and frequency as needed to adapt to different monitoring requirements, reducing the restrictions of the experimental environment on the device.
Smart Images
Figure CN223486050U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of partial signal generation and detection devices, and in particular to a partial discharge signal generation and detection device. Background Technology
[0002] Partial discharge refers to discharge that occurs between electrodes but does not penetrate them. It is caused by weaknesses in the insulation of electrical equipment or defects resulting from the manufacturing process, leading to repeated breakdowns and extinction under a high electric field. Partial discharge is a significant cause of deterioration in the insulation performance of electrical equipment. Therefore, monitoring partial discharge signals in electrical equipment is crucial. Currently, partial discharge detection sensors are typically placed either externally or internally to detect partial discharge signals.
[0003] Partial discharge detection sensors require partial discharge signal detection testing during factory testing to meet certain standards before delivery. Furthermore, training the partial discharge signal big data model also requires a large amount of partial discharge signal sample data. Currently, partial discharge signals are generally generated through discharge experiments in high-voltage laboratories. However, this method has several drawbacks: First, high-voltage discharge experiments require manual operation and typically involve generating high-voltage electricity, thus posing a certain risk. Second, each high-voltage discharge experiment consumes materials, and the sample data generation process requires a large amount of partial discharge signal data and numerous high-voltage discharge experiments, resulting in high costs. Third, high-voltage discharge experiments have strict environmental requirements; non-compliance with these requirements can easily lead to experimental failure or generate excessively weak, undetectable partial discharge signals. Fourth, since partial discharge signal samples and partial discharge detection sensor factory testing require partial discharge signals of different amplitudes and / or frequencies, the partial discharge signals generated by existing high-voltage discharge experiments cannot be accurately adjusted in real time.
[0004] The purpose of this invention is to design a partial discharge signal generation and detection device to address the problems existing in the prior art. Utility Model Content
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a partial discharge signal generation and detection device that can solve the above-mentioned technical problems.
[0006] This utility model provides a partial discharge signal generation and detection device, comprising: a partial discharge signal generating device and a partial discharge signal detection sensor; the partial discharge signal generating device is disposed inside a power metal cabinet, and the partial discharge signal generating device is connected to a wire inside the power metal cabinet and then connected to the grounding wire of the power metal cabinet, for generating a cable partial discharge signal; the partial discharge signal detection sensor is disposed on the grounding wire of the power metal cabinet, for detecting the cable partial discharge signal generated by the partial discharge signal generating device;
[0007] The partial discharge signal generating device includes:
[0008] Alternating current power supply, used to generate alternating current;
[0009] A step-up transformer, connected to the output terminal of the AC power supply, is used to step up the AC voltage to above 10kV;
[0010] A full-wave rectifier circuit, connected to the output terminal of the step-up transformer, is used to convert the AC cycle into a positive half-cycle;
[0011] The lighter is connected in parallel to both ends of the full-wave rectifier circuit to obtain the positive half-cycle AC power output by the full-wave rectifier circuit. The lighter and the primary coil L1 are connected in parallel to form an LC oscillation circuit, which generates a high-voltage high-frequency signal through oscillation.
[0012] The secondary coil L2 is coupled to the primary coil L1 and is used to obtain the high-voltage, high-frequency signal generated by the LC oscillation circuit.
[0013] A metal electrode is connected to the secondary coil L2 to generate a discharge electric field, thereby generating a partial discharge signal.
[0014] The partial discharge signal detection sensor is used to detect the partial discharge signal generated by the partial discharge signal generating device.
[0015] Furthermore, the step-up transformer includes a resistor R1 and a variable resistor RP1 connected in sequence; the variable resistor RP1 is used to adjust the output voltage of the step-up transformer.
[0016] Furthermore, the step-up transformer is connected to a first controller, which is wirelessly connected to a first Bluetooth module. The first Bluetooth module is used to acquire a remote amplitude adjustment signal and forward it to the first controller. The first controller is used to adjust the resistance value of the variable resistor RP1 according to the remote amplitude adjustment signal to realize the amplitude adjustment of the partial discharge signal.
[0017] Furthermore, the full-wave rectifier circuit includes: a MOSFET Q1 and a diode Q2;
[0018] The MOSFET Q1 is connected in series with the diode Q2 through the primary coil L1. The MOSFET Q1 and the diode Q2 are used for unidirectional current conduction.
[0019] Furthermore, the full-wave rectifier circuit is connected to a second controller, which is wirelessly connected to a second Bluetooth module. The second Bluetooth module is used to acquire a remote frequency adjustment signal and forward it to the second controller. The second controller is used to adjust the switching frequency of the MOSFET Q1 according to the remote frequency adjustment signal to achieve frequency adjustment of the partial discharge signal.
[0020] Furthermore, the lighter includes: capacitor C2, capacitor C3, and resistor R2 connected in parallel;
[0021] The capacitors C2 and C3 are connected in parallel to form a large capacitor; the resistor R2 is used to limit the current of the large capacitor.
[0022] Furthermore, the number of turns of the primary coil L1 is less than the number of turns of the secondary coil L2.
[0023] Furthermore, the metal electrode has a needle-like structure and is connected to a wire inside the power metal cabinet.
[0024] Furthermore, the partial discharge signal detection sensor is a high-frequency current sensor.
[0025] This utility model has the following advantages:
[0026] First, the generating device only needs to be connected to a standard 220V AC power supply to obtain a partial discharge signal, eliminating the need for additional artificial high-voltage experiments. This allows for continuous generation of partial discharge signals, effectively reducing the cost of signal generation. The existing safe distance for 10kV partial discharge experiments is 0.7m; however, the generating device in this embodiment does not require setting an additional distance, thus placing no restrictions on the environment for partial discharge signal generation.
[0027] Secondly, the voltage output of the AC power supply is boosted to above 10kV by a step-up transformer to ensure the stable generation of subsequent partial discharge signals. By adjusting the resistance value of the variable resistor inside the step-up transformer, the output voltage of the step-up transformer can be changed, thereby changing the amplitude of the partial discharge signal.
[0028] Third, the full-wave rectifier circuit ensures unidirectional current flow, thus achieving the rectification function.
[0029] Fourth, a large capacitor is formed by connecting capacitors C2 and C3 in parallel in the lighter. When the potential difference of the large capacitor reaches a certain level, it will break down the air in the gap of the large capacitor and form an LC oscillation circuit with the primary coil L1. Then, the LC oscillation circuit generates a high voltage and high frequency signal.
[0030] Fifth, the primary coil L1 and the secondary coil L2 transfer energy through magnetic coupling, so that the secondary coil L2 has a high voltage and high frequency signal, which causes the metal electrode to generate a discharge electric field and thus generate a partial discharge signal. Attached Figure Description
[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0032] Figure 1 This is a schematic diagram of the generation detection device in Embodiment 1.
[0033] Figure 2 This is a circuit diagram of the generating device in Embodiment 1. Detailed Implementation
[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the present invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0035] Example 1
[0036] like Figure 1 As shown, this solution provides a partial discharge signal generation and detection device, including: a partial discharge signal generator and a partial discharge signal detection sensor; the partial discharge signal generator is disposed inside a power metal cabinet, and the partial discharge signal generator is connected to a conductor inside the power metal cabinet and then to the grounding wire of the power metal cabinet, for generating a cable partial discharge signal; the partial discharge signal detection sensor is disposed on the grounding wire of the power metal cabinet, for detecting the cable partial discharge signal generated by the partial discharge signal generator;
[0037] In this embodiment, if Figure 1 As shown, the generating device in this embodiment can be installed inside a power metal cabinet. The metal electrode tip of the generating device is connected to a wire inside the metal cabinet, so that a partial discharge of the cable is generated between the metal cabinet and the wire. This partial discharge signal will flow into the ground through the grounding wire. The detection device in this embodiment is a high-frequency current sensor, which detects and collects the partial discharge signal through the high-frequency current sensor on the grounding wire.
[0038] like Figure 2 As shown, the partial discharge signal generating device includes:
[0039] Alternating current power supply, used to generate alternating current;
[0040] A step-up transformer, connected to the output terminal of the AC power supply, is used to step up the AC voltage to above 10kV;
[0041] A full-wave rectifier circuit, connected to the output terminal of the step-up transformer, is used to convert the AC cycle into a positive half-cycle;
[0042] A lighter is connected in parallel to both ends of the full-wave rectifier circuit, and a primary coil L1 is connected in parallel to obtain the positive half-cycle AC current input from the full-wave rectifier circuit. The lighter and the primary coil L1 are connected in parallel to form an LC oscillation circuit, which generates a high-voltage high-frequency signal through oscillation.
[0043] The secondary coil L2 is coupled to the primary coil L1 and is used to obtain the high-voltage, high-frequency signal generated by the LC oscillation circuit.
[0044] A metal electrode is connected to the secondary coil L2 to generate a discharge electric field, thereby generating a partial discharge signal.
[0045] In this embodiment, a capacitor C1 is connected in parallel across the AC power supply to filter the AC power. The generator only needs to be connected to a commonly used 220V AC power supply to obtain a partial discharge signal, eliminating the need for a separate artificial high-voltage experiment to generate the signal. This allows for continuous generation of partial discharge signals, effectively reducing the cost of signal generation. The existing safe distance for 10kV partial discharge experiments is 0.7m; however, the generator in this embodiment does not require setting an additional distance, thus placing no restrictions on the environment for partial discharge signal generation.
[0046] Furthermore, the step-up transformer includes a resistor R1 and a variable resistor RP1 connected in sequence; the variable resistor RP1 is used to adjust the output voltage of the step-up transformer.
[0047] In this embodiment, since the AC power supply is the commonly used 220V, and the generation of partial discharge signals requires high voltage, the voltage output by the AC power supply is boosted to above 10kV by a step-up transformer to ensure the stable generation of subsequent partial discharge signals.
[0048] Furthermore, the step-up transformer is connected to a first controller (not shown in the figure), and the controller is wirelessly connected to a first Bluetooth module (not shown in the figure). The first Bluetooth module is used to acquire a remote amplitude adjustment signal and forward it to the first controller. The first controller is used to adjust the resistance value of the variable resistor RP1 according to the remote amplitude adjustment signal to realize the amplitude adjustment of the partial discharge signal.
[0049] In this embodiment, the resistance value of the variable resistor RP1 can be adjusted by a knob connected to the variable resistor RP1, thereby changing the output voltage of the step-up transformer (adjustment range is 0-20kV) and thus changing the amplitude of the partial discharge signal. The amplitude of the partial discharge signal can also be adjusted by a controller and a Bluetooth module. The amplitude adjustment signal can be sent remotely via a mobile APP to ensure that the subsequent output partial discharge signal is compatible with different partial discharge monitoring devices.
[0050] Furthermore, the full-wave rectifier circuit includes: a MOSFET Q1 and a diode Q2;
[0051] The MOSFET Q1 is connected in series with the diode Q2 through the primary coil L1. The MOSFET Q1 and the diode Q2 are used for unidirectional current conduction.
[0052] In this embodiment, when the input voltage is positive, MOSFET Q1 is turned on to allow current to flow; when the input voltage is negative, MOSFET Q1 is turned off. Diode Q2 is used to provide a reverse path when MOSFET Q1 is turned off to ensure unidirectional current flow and achieve rectification.
[0053] Furthermore, the full-wave rectifier circuit is connected to a second controller (not shown in the figure), and the second controller is wirelessly connected to a second Bluetooth module (not shown in the figure). The second Bluetooth module is used to acquire a remote frequency adjustment signal and forward it to the second controller. The second controller is used to adjust the switching frequency of the MOS transistor Q1 according to the remote frequency adjustment signal to realize the frequency adjustment of the partial discharge signal.
[0054] In this embodiment, the frequency of the partial discharge signal can be remotely adjusted via a mobile app through the controller and Bluetooth module, ensuring that the subsequent output partial discharge signal is compatible with different partial discharge monitoring devices.
[0055] In this embodiment, the first controller and the second controller can be two independent controllers or the same controller, and the first Bluetooth module and the second Bluetooth module can be two independent Bluetooth modules or the same Bluetooth module.
[0056] Furthermore, the lighter includes: capacitor C2, capacitor C3, and resistor R2 connected in parallel;
[0057] The capacitors C2 and C3 are connected in parallel to form a large capacitor; the resistor R2 is used to limit the current of the large capacitor.
[0058] In this embodiment, the voltage output from the full-wave rectifier circuit powers capacitors C2 and C3 connected in parallel to form a large capacitor. When the potential difference of the large capacitor reaches a certain level, it breaks down the air in the gap between the large capacitors, forming an LC oscillation circuit with the primary coil L1. This LC oscillation circuit then generates a high-voltage, high-frequency signal. Resistor R2 is used to limit the current magnitude to prevent large currents from damaging the circuit.
[0059] Furthermore, the number of turns of the primary coil L1 is less than the number of turns of the secondary coil L2.
[0060] In this embodiment, since the turns ratio of the coil is inversely proportional to the current, the primary coil L1 has far fewer turns than the secondary coil, and the current in the secondary coil L2 is smaller, which can ensure personal safety.
[0061] Furthermore, the metal electrode has a needle-like structure and is connected to a wire inside the power metal cabinet.
[0062] In this embodiment, since the partial discharge signal of the power equipment is generated by electric field distortion, in order to simulate this partial discharge signal, it is necessary to ensure that the electric field distortion at the metal electrode of the discharge is large. Therefore, the metal electrode is made into a needle-shaped structure.
[0063] The above description is only a part of the embodiments of this utility model, and does not limit the scope of protection of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this utility model.
Claims
1. A device for detecting the generation of partial discharge signals, characterized in that, include: A partial discharge signal generator and a partial discharge signal detection sensor are provided. The partial discharge signal generator is installed inside a power metal cabinet and connected to a conductor inside the power metal cabinet, which in turn connects to the grounding wire of the power metal cabinet, for generating a partial discharge signal in the cable. The partial discharge signal detection sensor is installed on the grounding wire of the power metal cabinet for detecting the partial discharge signal generated by the partial discharge signal generator. The partial discharge signal generating device includes: Alternating current power supply, used to generate alternating current; A step-up transformer, connected to the output terminal of the AC power supply, is used to step up the AC voltage to above 10kV; A full-wave rectifier circuit, connected to the output terminal of the step-up transformer, is used to convert the AC cycle into a positive half-cycle; The lighter is connected in parallel to both ends of the full-wave rectifier circuit to obtain the positive half-cycle AC power output by the full-wave rectifier circuit. The lighter and the primary coil L1 are connected in parallel to form an LC oscillation circuit, which generates a high-voltage high-frequency signal through oscillation. The secondary coil L2 is coupled to the primary coil L1 and is used to obtain the high-voltage, high-frequency signal generated by the LC oscillation circuit. A metal electrode is connected to the secondary coil L2 to generate a discharge electric field, thereby generating a partial discharge signal in the cable.
2. The partial discharge signal generation and detection device according to claim 1, characterized in that, The step-up transformer includes a resistor R1 and a variable resistor RP1 connected in sequence; the variable resistor RP1 is used to adjust the output voltage of the step-up transformer.
3. The partial discharge signal generation and detection device according to claim 2, characterized in that, The step-up transformer is connected to a first controller, which is wirelessly connected to a first Bluetooth module. The first Bluetooth module is used to acquire a remote amplitude adjustment signal and forward it to the first controller. The first controller is used to adjust the resistance value of the variable resistor RP1 according to the remote amplitude adjustment signal to realize the amplitude adjustment of the partial discharge signal.
4. The partial discharge signal generation and detection device according to claim 1, characterized in that, The full-wave rectifier circuit includes: MOSFET Q1 and diode Q2; The MOSFET Q1 is connected in series with the diode Q2 through the primary coil L1. The MOSFET Q1 and the diode Q2 are used for unidirectional current conduction.
5. The partial discharge signal generation and detection device according to claim 4, characterized in that, The full-wave rectifier circuit is connected to a second controller, which is wirelessly connected to a second Bluetooth module. The second Bluetooth module is used to acquire a remote frequency adjustment signal and forward it to the second controller. The second controller is used to adjust the switching frequency of the MOSFET Q1 according to the remote frequency adjustment signal to achieve frequency adjustment of the partial discharge signal.
6. The partial discharge signal generation and detection device according to claim 1, characterized in that, The lighter includes: capacitor C2, capacitor C3, and resistor R2 connected in parallel; The capacitors C2 and C3 are connected in parallel to form a large capacitor; the resistor R2 is used to limit the current of the large capacitor.
7. The partial discharge signal generation and detection device according to claim 1, characterized in that, The number of turns of the primary coil L1 is less than the number of turns of the secondary coil L2.
8. The partial discharge signal generation and detection device according to claim 1, characterized in that, The metal electrode has a needle-like structure and is connected to a wire inside the power metal cabinet.
9. The partial discharge signal generation and detection device according to claim 1, characterized in that, The partial discharge signal detection sensor is a high-frequency current sensor.