GIS Partial Discharge Detection Device and Method Based on Parity-Time Reversal Symmetry

Abstract

The present invention provides a GIS partial discharge detection device and method based on parity-time inversion symmetry. The device includes two parts: an LC sensor and a readout circuit. The LC sensor is composed of a parallel plate capacitor added with a charge adsorption material, an inductance coil, and a resistor connected in parallel. The LC sensor and the readout circuit perform energy coupling and signal transmission through inductive coupling. By adjusting the inductance, capacitance, and negative resistance parameters of the readout circuit, the LC sensor and the readout circuit are in the PT symmetry singular point position. When partial discharge occurs inside the GIS, the charge in the space increases, the charge adsorption material on the capacitor plates adsorbs the charge, the electrostatic force between the two capacitor plates increases, causing the distance between the two capacitor plates to change, the sensor capacitance changes, and a frequency splitting phenomenon appears. When the readout circuit system detects the system frequency splitting, it can detect the occurrence of partial discharge inside the GIS. The structure of the present invention is simple and has high sensitivity, which can improve the accuracy of partial discharge detection.

Description

Technical Field

[0001] The present invention relates to the technical field of LC sensors, and particularly to a GIS partial discharge detection device and method based on parity-time inversion symmetry. Background Art

[0002] Gas Insulated Substation (GIS) is widely used in high-voltage and extra-high-voltage power transmission systems. The GIS equipment has high reliability. However, once a fault occurs inside the GIS equipment, the characteristics of strong enclosure and complex internal structure of the GIS equipment make it difficult for people to accurately find and determine the location of the fault.

[0003] Among all the fault types that occur in GIS equipment, faults caused by insulation problems are the most common. Partial discharge is an important factor inducing insulation deterioration and even insulation faults in GIS equipment. It will further deepen the deterioration degree of its surface and thus trigger insulation faults.

[0004] In quantum mechanics, each classical physical quantity corresponds to an operator (or matrix), and they follow non-commutative multiplication algebra. If the operator has Hermiticity, it can ensure that the physical quantity is observable. It has always been a consensus that Hermitian operators represent observable physical quantities. However, non-Hermitian operators may also correspond to observable physical quantities. In 1998, Bender and Boettcher proposed a special series of PT-symmetric Hamiltonians. This PT-symmetric Hamiltonian is non-Hermitian but has a real energy spectrum; that is, the operator (or matrix) satisfying PT symmetry has a real energy spectrum. Since then, theoretical research on PT symmetry has been carried out internationally. If such a non-Hermitian system is to correspond to a self-consistent quantum theory, several conditions need to be met: the inner product of the system is positive definite, the system has completeness, the unitarity of the system time evolution, etc. So far, the framework of the PT-symmetric non-Hermitian quantum system is basically perfect.

[0005] In 2014, Jan Wiersig of the University of Magdeburg in Germany proposed to bias the PT-symmetric gain-loss system at the exceptional point. The change of external parameters is equivalent to applying a perturbation to the system, causing the system frequency to split. The sensor based on this principle has extremely high sensitivity.

[0006] The existing GIS partial discharge detection technologies are restricted by factors such as the volume of the sensor and the physical quantity to be detected, and cannot achieve high-sensitivity partial discharge detection. Therefore, a high-sensitivity partial discharge detection technology is needed. Summary of the Invention

[0007] Technical problem: The object of the present invention is to address the deficiencies of the above-mentioned background technology by providing a GIS partial discharge detection device and method based on parity-time reversal symmetry, which improves the sensitivity of partial discharge detection and solves the problem of insufficient sensitivity in traditional LC sensor partial discharge detection methods.

[0008] Technical solution:

[0009] The GIS partial discharge detection device based on parity-time reversal symmetry of the present invention adopts the following structure:

[0010] The GIS partial discharge detection device based on parity-time reversal symmetry includes: an LC sensor and a readout circuit;

[0011] The readout circuit includes a signal analyzer, a tunable capacitor, a readout inductor coil, and a negative resistor, and the signal analyzer, the tunable capacitor, the readout inductor coil, and the negative resistor are connected in parallel;

[0012] The LC sensor includes a sensor inductor coil, a parallel plate capacitor, and a resistor, and the sensor inductor coil, the parallel plate capacitor, and the resistor are connected in parallel;

[0013] The LC sensor and the readout circuit perform energy coupling and signal transmission through inductive coupling.

[0014] Preferably, a charge adsorption material is added to the upper plate of the parallel plate capacitor.

[0015] The LC sensor is installed inside the metal cavity of the gas-insulated transformer equipment GIS, and the readout circuit is installed outside the metal cavity of the gas-insulated transformer equipment GIS.

[0016] By adjusting the tunable capacitor and the negative resistor of the readout circuit, the system is made to satisfy the PT symmetry singularity condition, where the system includes the LC sensor and the readout circuit.

[0017] When partial discharge occurs inside the metal cavity of the gas-insulated transformer equipment GIS, the charge in the space increases, the charge adsorption material adsorbs the charge, the electrostatic force between the two plates of the parallel plate capacitor increases, causing the distance between the two plates of the parallel plate capacitor to change, the parallel plate capacitor of the LC sensor changes, frequency splitting occurs, and the readout circuit detects the frequency splitting of the system, indicating that partial discharge has occurred inside the metal cavity of the gas-insulated transformer equipment GIS.

[0018] The GIS partial discharge detection method based on parity-time reversal symmetry includes the following steps:

[0019] Step 1: Adjust the tunable capacitor and the negative resistor of the readout circuit to make the entire system in the PT symmetry singularity state;

[0020] Step 2: When partial discharge occurs inside the metal cavity of the gas-insulated switchgear (GIS), the space charge quantity increases, the charge adsorption material adsorbs charges, the electrostatic force between the two plates of the parallel-plate capacitor increases, causing the distance between the two plates of the parallel-plate capacitor to change, and the capacitance value of the LC sensor changes. The change in the capacitance value of the LC sensor is equivalent to applying a perturbation to the system, causing system frequency splitting;

[0021] Step 3: The readout circuit performs signal transmission through the inductive coupling of the readout inductance coil and the sensor inductance coil;

[0022] Step 4: The signal analyzer detects the system frequency splitting, thereby detecting the occurrence of partial discharge.

[0023] Beneficial effects: By adopting the above technical solutions, the present invention has the following advantages:

[0024] (1) Compared with other GIS partial discharge detection methods, the GIS partial discharge detection device based on parity-time reversal symmetry of the present invention has relatively high sensitivity.

[0025] (2) The present invention can place the sensor probe inside the GIS device to achieve wireless signal transmission without opening holes in the GIS box body, which affects the normal operation of the GIS device.

[0026] (3) The structure of the present invention is simple. By using the PT symmetry principle, the readout system is simplified, real-time measurement is achieved, and the measurement accuracy is improved. Brief description of the drawings

[0027] Figure 1 It is a schematic diagram of the GIS partial discharge detection device based on parity-time reversal symmetry of the present invention.

[0028] Figure 2 is Figure 1 a schematic diagram when the provided system generates frequency splitting.

[0029] In the figure:

[0030] LC sensor 1, sensor inductance coil 11, parallel-plate capacitor 12, resistor 13, charge adsorption material 14;

[0031] Readout system 2, signal analyzer 21, adjustable capacitor 22, readout inductance coil 23, negative resistor 24. Detailed implementation manners

[0032] The technical solutions of the invention will be described in detail below with reference to the drawings.

[0033] As Figure 1 、 Figure 2As shown in the figure, the GIS partial discharge detection device based on parity-time reversal (PT) symmetry disclosed by the present invention includes two parts: an LC sensor 1 and a readout circuit 2. Among them, the LC sensor 1 and the readout circuit 2 perform energy coupling and signal transmission through inductive coupling. The readout circuit 2 is composed of a signal analyzer 21, a tunable capacitor 22, a readout inductance coil 23, and a negative resistor 24 connected in parallel; the LC sensor 1 is composed of a sensor inductance coil 11, a parallel plate capacitor 12, and a resistor 13 connected in parallel.

[0034] The GIS partial discharge detection device based on parity-time reversal (PT) symmetry of the present invention is characterized in that when partial discharge occurs inside the GIS, the charge in the space increases, and the charge adsorption material 14 on the plates of the parallel plate capacitor 12 adsorbs the charge, so that the electrostatic force between the two plates increases, the distance d between the two capacitor plates changes, the capacitance of the LC sensor 1 changes, and a frequency splitting phenomenon appears. The readout circuit 2 detects the system frequency splitting, as Figure 2 shown, and the occurrence of partial discharge inside the GIS can be detected.

[0035] GIS Partial Discharge Detection Method Based on Parity-Time Reversal Symmetry

[0036] (1) Adjust the tunable capacitor 22 and the negative resistor 24 of the readout circuit 2 to make the whole system in the PT symmetry singularity state;

[0037] (2) When partial discharge occurs inside the GIS, the amount of charge in the space increases, and the charge adsorption material 14 on the plates of the parallel plate capacitor 12 adsorbs the charge, so that the electrostatic force between the two plates increases, the distance d between the two plates changes, the capacitance of the LC sensor 1 changes, and the change in the capacitance value of the LC sensor 1 is equivalent to applying a perturbation to the system, causing system frequency splitting;

[0038] (3) The readout circuit 2 performs signal transmission through inductive coupling between the readout coil 23 and the sensor coil 11;

[0039] (4) The signal analyzer 21 detects the system frequency splitting, thereby detecting the occurrence of partial discharge, and analyzing the frequency splitting amount Δf can form a corresponding relationship with the partial discharge amount.

[0040] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A detection method for a partial discharge detection device of GIS based on parity-time reversal symmetry, characterized in that, The device includes: an LC sensor and a readout circuit; The readout circuit includes a signal analyzer, a tunable capacitor, a readout inductance coil, and a negative resistance, and the signal analyzer, the tunable capacitor, the readout inductance coil, and the negative resistance are connected in parallel; The LC sensor includes a sensor inductance coil, a parallel plate capacitor, and a resistor, and the sensor inductance coil, the parallel plate capacitor, and the resistor are connected in parallel; The LC sensor and the readout circuit perform energy coupling and signal transmission through inductive coupling; The detection method includes the following steps: Step 1: Adjust the tunable capacitor and the negative resistance of the readout circuit to make the system in the PT-symmetric singular point state; Step 2: When partial discharge occurs inside the metal cavity of the gas-insulated transformer (GIS) equipment, the space charge amount increases, the charge adsorption material adsorbs charges, the electrostatic force between the two plates of the parallel plate capacitor increases, causing the distance between the two plates of the parallel plate capacitor to change, the parallel plate capacitance value of the LC sensor changes, and the change in the capacitance value of the LC sensor is equivalent to applying a perturbation to the system, resulting in system frequency splitting; Step 3: The readout circuit performs signal transmission through the inductive coupling of the readout inductance coil and the sensor inductance coil; Step 4: The signal analyzer detects the frequency splitting of the system, thereby detecting the occurrence of the partial discharge phenomenon.

2. The detection method of the GIS partial discharge detection device based on parity-time reversal symmetry according to claim 1, wherein, A charge adsorption material is added to the upper plate of the parallel plate capacitor.

3. The detection method of the GIS partial discharge detection device based on parity-time reversal symmetry according to claim 1, characterized in that, The LC sensor is installed inside the metal cavity of the gas-insulated transformer (GIS) equipment, and the readout circuit is installed outside the metal cavity of the gas-insulated transformer (GIS) equipment.

4. The detection method of the GIS partial discharge detection device based on parity-time reversal symmetry according to claim 1, characterized in that, By adjusting the tunable capacitor and the negative resistance of the readout circuit, the system satisfies the PT-symmetric singular point condition, where the system includes the LC sensor and the readout circuit.

5. The detection method of the GIS partial discharge detection device based on parity-time inversion symmetry according to claim 2, characterized in that When partial discharge occurs inside the metal cavity of the gas-insulated transformer (GIS) equipment, the charge in the space increases, the charge adsorption material adsorbs charges, the electrostatic force between the two plates of the parallel plate capacitor increases, causing the distance between the two plates of the parallel plate capacitor to change, the parallel plate capacitance of the LC sensor changes, frequency splitting occurs, and the readout circuit detects the system frequency splitting, that is, partial discharge occurs inside the metal cavity of the gas-insulated transformer (GIS) equipment.

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