Device and method for simulating multi-turn continuous breakdown of reactor winding

Abstract

According to the simulation device and method for the multi-turn continuous breakdown of the reactor winding, in the simulation device for the multi-turn continuous breakdown of the reactor winding, a high-voltage power supply unit provides power frequency voltage; the voltage regulator is connected with the high-voltage power supply unit so as to regulate the value of voltage applied to the turn-to-turn coil assembly; the protective resistor # imgabs0 # is positioned between the voltage regulator and the turn-to-turn coil assembly so as to limit the current in the circuit; the turn-to-turn coil assembly is fixed on the supporting structure, and a conductor winds a plurality of turns of coils on the outer wall of the supporting structure to form a turn-to-turn winding; the voltage-dividing capacitor network is connected in series with a capacitor between every two adjacent turns of coils of the turn-to-turn coil assembly so as to adjust and distribute voltage; and the voltage monitoring system is used for measuring and recording the voltage between turns in the turn-to-turn coil assembly in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of reactors, in particular to a device and method for simulating continuous breakdown of multiple turns of a reactor winding. Background Art

[0002] As a key component in power systems, the insulation performance of reactor windings between turns is crucial to the stable operation of the system. In actual operation, due to manufacturing defects, mechanical stress, environmental factors, and long-term aging, local discharges may occur between reactor winding turns, gradually developing into interturn breakdown, leading to serious electrical failures. These failures not only damage the equipment but can also trigger a chain reaction in the power system, resulting in severe consequences such as widespread power outages.

[0003] In the prior art, existing simulation devices and technologies mainly focus on fault simulation of transformer windings, mostly relying on oil-immersed structures, ignoring the differences in structure and operating characteristics between reactors and transformers, resulting in limited applicability in reactor fault simulation. In addition, existing simulation devices and technologies are mostly based on research on defect types such as pin plates and surface defects, lacking research based on inter-turn discharge, and there is even a lack of research on devices and test methods for continuous breakdown of multi-turn windings. Therefore, there is an urgent need for test devices and methods that can accurately simulate the voltage distribution between turns of reactor windings through a capacitive voltage divider network, and achieve inter-turn breakdown at different positions by introducing defects. This method can not only flexibly adjust the voltage distribution between turns, but also select specific locations to introduce defects as needed, thereby more accurately simulating fault conditions under different working conditions.

[0004] The information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0005] In response to the shortcomings or defects of the existing technology, a simulation device and method for continuous breakdown of multiple turns of a reactor winding are provided. By flexibly adjusting the capacitance value and the location of the introduced defects, the fault scenarios under various actual working conditions are fully simulated, filling the gaps in the existing technology and providing more flexible and controllable experimental conditions, which provides important theoretical basis and technical support for improving the design of the reactor and enhancing its reliability and safety.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] A device for simulating the continuous breakdown of multiple turns of a reactor winding comprises:

[0008] a high-voltage power supply unit, which provides a power frequency voltage;

[0009] a voltage regulator connected to the high-voltage power supply unit to adjust the voltage value applied to the inter-turn coil assembly;

[0010] protective resistor , which is located between the voltage regulator and the inter-turn coil assembly to limit the current in the circuit;

[0011] Support structure;

[0012] An inter-turn coil assembly is fixed on the support structure, and a conductor is wound around the outer wall of the support structure with multiple turns of coil to form an inter-turn winding;

[0013] A voltage-dividing capacitor network, in which a capacitor is connected in series between every two adjacent turns of the inter-turn coil assembly to adjust and distribute the voltage;

[0014] A voltage monitoring system is used to measure and record the voltage between each turn in the inter-turn coil assembly in real time.

[0015] In the simulation device for the continuous breakdown of multiple turns of a reactor winding, the inter-turn coil assembly is wound with a copper wire coated with an insulating material.

[0016] In the device for simulating the continuous breakdown of multiple turns of a reactor winding, defects can be introduced between two adjacent turns of the inter-turn coil assembly to simulate different fault scenarios.

[0017] In the device for simulating the continuous breakdown of multiple turns of a reactor winding, the voltage-dividing capacitor network includes an adjustable capacitor.

[0018] In the simulation device for the continuous breakdown of multiple turns of the reactor winding, the inter-turn coil assembly has a total of four turns, which are recorded as the 1st, 2nd, 3rd, and 4th turns from bottom to top, forming a total of three turn gaps. Each turn gap is connected in series with an adjustable capacitor, which are recorded as capacitor C1, capacitor C2, and capacitor C3 respectively.

[0019] In the simulation device for continuous breakdown of multiple turns of the reactor winding, the voltage between the three turn gaps is inversely proportional to the capacitive reactance of the corresponding capacitors C1, C2, and C3. The voltage distribution between the turns is adjusted by adjusting the capacitance values of the capacitors C1, C2, and C3 to simulate the uneven voltage distribution under different working conditions.

[0020] In the simulation device for the continuous breakdown of multiple turns of reactor windings, the voltage monitoring system includes a voltage sensor and an oscilloscope for real-time monitoring of voltage changes at both ends of each turn of the coil. The voltage sensor transmits data to the oscilloscope for recording and analysis.

[0021] In the simulation device for the continuous breakdown of multiple turns of a reactor winding, the protective resistor is a water resistor, and the resistance value is changed by changing the solute concentration.

[0022] The test method of the simulation device for the continuous breakdown of multiple turns of reactor windings includes the following steps:

[0023] Step 1: Adjust the capacitance value of the capacitor so that the capacitance value decreases or increases from bottom to top to simulate different voltage distribution conditions;

[0024] Step 2: Introduce a defect at a selected location so that the inter-turn insulation at the selected location breaks down first;

[0025] Step 3: Use the high-voltage power supply unit to gradually increase the voltage until the insulation between the first turns breaks down, causing the corresponding capacitor to short-circuit;

[0026] Step 4: Continue to apply voltage, and the remaining turns of the coil will break down one after another, and the corresponding capacitors will be short-circuited one after another.

[0027] In the test method, during the entire process from step 3 to step 4, a voltage monitoring system is used to record the voltage across each turn of the coil in real time.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention can simulate various fault scenarios under actual operating conditions by flexibly adjusting the capacitance value and the location of the introduced defects. The flexible and controllable experimental conditions fill a gap in the existing technology. This provides more flexible and controllable experimental conditions, providing important theoretical basis and technical support for improving reactor design and enhancing its reliability and safety.

[0030] The above description is only an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and easier to understand, so that those skilled in the art can implement it according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are illustrated below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are intended only to illustrate preferred embodiments and are not to be construed as limiting the present invention. It should be understood that the drawings described below are merely examples of the present invention, and that those skilled in the art will be able to derive other drawings from these drawings without inventive effort. Throughout the drawings, identical reference numerals are used to denote identical components.

[0032] In the attached figure:

[0033] Figure 1A schematic diagram showing the structure of a simulation device for continuous breakdown of multiple turns of a reactor winding according to a preferred embodiment of the present invention;

[0034] Figure 2 A schematic diagram showing a test flow of a device for simulating continuous breakdown of multiple turns of a reactor winding according to a preferred embodiment of the present invention.

[0035] The present invention will be further explained below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0036] Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0037] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the invention. The scope of protection of the present invention shall be as defined in the attached claims.

[0038] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings. However, the accompanying drawings do not limit the embodiments of the present invention.

[0039] For better understanding, Figures 1 to 2 As shown, a simulation device for continuous breakdown of multiple turns of a reactor winding includes:

[0040] a high-voltage power supply unit, which provides a power frequency voltage;

[0041] a voltage regulator connected to the high-voltage power supply unit to adjust the voltage value applied to the inter-turn coil assembly;

[0042] protective resistor , which is located between the voltage regulator and the inter-turn coil assembly to limit the current in the circuit;

[0043] Support structure;

[0044] An inter-turn coil assembly is fixed on the support structure, and a conductor is wound around the outer wall of the support structure with multiple turns of coil to form an inter-turn winding;

[0045] A voltage-dividing capacitor network, in which a capacitor is connected in series between every two adjacent turns of the inter-turn coil assembly to adjust and distribute the voltage;

[0046] A voltage monitoring system is used to measure and record the voltage between each turn in the inter-turn coil assembly in real time.

[0047] In a preferred embodiment of the device for simulating the continuous breakdown of multiple turns of a reactor winding, the inter-turn coil assembly is wound with a copper wire coated with an insulating material.

[0048] In a preferred embodiment of the device for simulating the continuous breakdown of multiple turns of a reactor winding, defects can be introduced between two adjacent turns of the inter-turn coil assembly to simulate different fault scenarios.

[0049] In a preferred embodiment of the device for simulating the continuous breakdown of multiple turns of a reactor winding, the voltage-dividing capacitor network includes an adjustable capacitor.

[0050] In a preferred embodiment of the simulation device for the continuous breakdown of multiple turns of the reactor winding, the inter-turn coil assembly has a total of four turns, which are respectively recorded as the 1st, 2nd, 3rd, and 4th turns from bottom to top, forming a total of three turn gaps, and each turn gap is connected in series with an adjustable capacitor, which are respectively recorded as capacitor C1, capacitor C2, and capacitor C3.

[0051] In a preferred embodiment of the device for simulating continuous breakdown of multiple turns of a reactor winding, the voltage between the three turn gaps is inversely proportional to the capacitive reactance of the corresponding capacitors C1, C2, and C3. The voltage distribution between the turns is adjusted by adjusting the capacitance values of the capacitors C1, C2, and C3 to simulate the uneven voltage distribution under different working conditions.

[0052] In a preferred embodiment of the device for simulating the continuous breakdown of multiple turns of a reactor winding, the voltage monitoring system includes a voltage sensor and an oscilloscope for real-time monitoring of voltage changes across each turn of the coil, and the voltage sensor transmits data to the oscilloscope for recording and analysis.

[0053] In a preferred embodiment of the device for simulating the continuous breakdown of multiple turns of a reactor winding, the protective resistor is a water resistor, and the resistance value is changed by changing the solute concentration.

[0054] The test method of the simulation device for the continuous breakdown of multiple turns of reactor windings includes the following steps:

[0055] Step 1: Adjust the capacitance value of the capacitor so that the capacitance value decreases or increases from bottom to top to simulate different voltage distribution conditions;

[0056] Step 2: Introduce a defect at a selected location so that the inter-turn insulation at the selected location breaks down first;

[0057] Step 3: Use the high-voltage power supply unit to gradually increase the voltage until the insulation between the first turns breaks down, causing the corresponding capacitor to short-circuit;

[0058] Step 4: Continue to apply voltage, and the remaining turns of the coil will break down one after another, and the corresponding capacitors will be short-circuited one after another.

[0059] In a preferred embodiment of the test method, during the entire process from step 3 to step 4, a voltage monitoring system is used to record the voltage across each coil turn in real time.

[0060] In one embodiment, Figure 1 As shown, a simulation device for continuous breakdown of multiple turns of a reactor winding includes:

[0061] High-voltage power supply unit A1: provides power frequency voltage for the circuit;

[0062] Voltage regulator A2: connected to the high-voltage power supply unit A1, used to freely adjust the voltage value applied to the inter-turn coil assembly;

[0063] protective resistor A3: Located between the voltage regulator A2 and the inter-turn coil assembly A5, it is used to control the current in the circuit so as not to be too high to avoid safety accidents;

[0064] Support structure A4: provides basic support, and its outer wall can be wound with multiple turns of coil;

[0065] Inter-turn coil assembly A5: fixed on the support structure A4, formed by winding a conductor to form an inter-turn winding;

[0066] Voltage divider capacitor network A6: A capacitor is connected in series between each two adjacent turns of the coil to regulate and distribute the voltage;

[0067] Voltage monitoring system A7: used for measuring and recording the voltage between each turn in the inter-turn coil assembly A5 in real time.

[0068] The inter-turn coil assembly A5 is wound with copper wire covered with insulating material.

[0069] In the inter-turn coil assembly A5, defects can be introduced between two adjacent turns of the coil, thereby simulating different fault scenarios.

[0070] The voltage-dividing capacitor network A6 is composed of adjustable capacitors.

[0071] The inter-turn coil assembly A5 has a total of four turns, which are marked as the 1st, 2nd, 3rd and 4th turns from bottom to top, forming three turn gaps. Each turn gap is connected in series with an adjustable capacitor, which are marked as capacitor C1, capacitor C2 and capacitor C3 respectively.

[0072] The voltage between the three turn gaps is inversely proportional to the capacitive reactance of the corresponding three capacitors. By adjusting the capacitance values of capacitors C1, C2, and C3, the voltage distribution between the turns can be flexibly adjusted to simulate the uneven voltage distribution under different working conditions.

[0073] The voltage monitoring system A7 includes a high-precision voltage sensor and an oscilloscope. The high-precision voltage sensor is used to monitor the voltage changes at both ends of each coil turn in real time and transmit the data to the oscilloscope for recording and analysis.

[0074] See also Figure 1 The high-voltage power supply unit A1 provides the power frequency voltage for the circuit and acts as a power supply; the voltage regulator A2 is connected to the high-voltage power supply unit A1 and is used to freely adjust the voltage transmitted by A1 and apply it to the inter-turn coil assembly A5; the protective resistor A3 is located between the voltage regulator A2 and the interturn coil assembly A5. It controls the current in the circuit to prevent excessively high levels, thereby preventing potential safety hazards and protecting the circuit. The resistance of the protective resistor is adjustable. The support structure A4 provides basic support, and its outer wall can be wound around multiple turns of coils. The interturn coil assembly A5 is fixed to this support structure and is composed of conductors wound to form an interturn winding. The voltage divider capacitor network A6, with a capacitor connected in series between each two adjacent turns, regulates and distributes the voltage. The value of the capacitor is adjustable. The voltage monitoring system A7 measures and records the voltage between each turn of the interturn coil assembly A5 in real time. Furthermore, CH1-CH4 represent the voltage values at specific locations in the diagram. CH1 represents the voltage at the power supply terminal C1, CH2 represents the voltage value at any point between C1 and C2, CH3 represents the voltage value at any point between C2 and C3, and CH4 represents the voltage value at any point between C3 and ground. The voltage values at CH1-CH4 are acquired by sensors and input into an oscilloscope in the voltage monitoring system for waveform acquisition and storage. It can simulate various types of multi-turn breakdown faults in reactor windings, filling the current research gap.

[0075] The protective resistor is a water resistor, and the resistance value can be changed by changing the solute concentration.

[0076] A test method simulating the continuous breakdown of multiple turns of reactor windings, such as Figure 2 As shown, specifically including,

[0077] Step 1: Adjust the capacitance values of the series capacitors so that the capacitance values decrease or increase from bottom to top to simulate different voltage distributions.

[0078] Step 2: Introduce defects at selected locations (such as damaging the coil insulation layer or adding metal particles) so that the inter-turn insulation at that location breaks down first.

[0079] Step 3: Use the high-voltage power supply unit A1 to gradually increase the voltage until the first inter-turn insulation breaks down, causing the corresponding capacitor to short-circuit.

[0080] Step 4: Continue to apply voltage, and the remaining turns of the coil will break down one after another, and the corresponding capacitors will be short-circuited one after another.

[0081] During the entire process from step 13 to step 4, the voltage monitoring system A7 is used to record the voltage across each coil turn in real time.

[0082] In another embodiment provided by the present invention, the development process of continuous breakdown of multiple turns of the reactor winding is simulated. First, the capacitance value is adjusted so that C1>C2>C3, and an insulation defect is introduced between the 3rd turn and the 2nd turn. The spacing between the three turn gaps is kept consistent to ensure the consistency of the experimental conditions. Subsequently, the voltage is gradually increased by the step-by-step voltage step-up method using the high-voltage power supply unit A1 and the voltage regulator A2. When the external applied voltage reaches a certain critical value, the gap between the 3rd turn and the 2nd turn is first broken down due to the introduced defect, causing the capacitor C2 to short-circuit first, forming a single-turn arc, and the winding voltage is redistributed to C1 and C3. Since C1 is greater than C3, the voltage between the 4th turn and the 3rd turn rises rapidly, and the voltage between the 3rd turn and the 2nd turn is significantly higher than the voltage between the 4th turn and the 3rd turn. Therefore, the gap between the 4th turn and the 3rd turn quickly breaks down and forms an arc. At this point, C3 is also short-circuited, and the winding voltage is completely borne by C1, causing the voltage between the second and first turns to rise sharply until it breaks down and forms an arc, short-circuiting capacitor C1. The above steps effectively simulate the multi-turn continuous breakdown process of a reactor winding under power frequency voltage conditions with uneven voltage distribution.

[0083] In addition, the test method of the present invention can also simulate the multi-turn continuous breakdown process in other situations. In another embodiment of the present invention, the capacitance value is first adjusted so that C1=C2=C3, and an insulation defect is introduced between the second turn and the first turn. At the same time, the spacing between the three turn gaps is adjusted so that d1 <d2>d3 (i.e., the distance between the 1st and 2nd turns is shorter, the distance between the 2nd and 3rd turns is longer, and the distance between the 3rd and 4th turns is further shortened). Subsequently, the voltage is gradually increased using a step-by-step voltage-boosting method using high-voltage power supply unit A1 and voltage regulator A2. When the applied voltage reaches a critical value, breakdown occurs first at the location between the 2nd and 1st turns due to the short distance and presence of a defect. This causes capacitor C1 to short-circuit first, forming a single-turn arc. At this point, the winding voltage is redistributed to capacitors C2 and C3. Because the distance between the 2nd and 3rd turns is longer and the insulation strength is higher, the gap between the 3rd and 2nd turns is less susceptible to breakdown. As the voltage continues to rise, the voltage between the 4th and 3rd turns rises rapidly. Because the distance at this location is shorter and free of defects, but the voltage distribution is higher, breakdown quickly occurs, leading to arc formation. At this point, C3 is also short-circuited, and the winding voltage is completely borne by C2. This causes the voltage between the 3rd and 2nd turns to rise sharply, until breakdown and arc formation occur. Finally, the gap between the second and third turns breaks down due to the further increase in voltage, short-circuiting capacitor C2. The above steps can effectively simulate the continuous breakdown process of multiple turns of a reactor winding under power frequency voltage conditions with different inter-turn distances.

[0084] In summary, the present invention flexibly adjusts the capacitance value and the location of the introduced defects to comprehensively simulate fault scenarios under various actual working conditions, filling the gaps in the existing technology and providing more flexible and controllable experimental conditions, thus providing important theoretical basis and technical support for improving the design of reactors and enhancing their reliability and safety.

[0085] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0086] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A device for simulating the continuous breakdown of multiple turns of a reactor winding, characterized in that: It includes, a high-voltage power supply unit, which provides a power frequency voltage; a voltage regulator connected to the high-voltage power supply unit to adjust the voltage value applied to the inter-turn coil assembly; protective resistor , which is located between the voltage regulator and the inter-turn coil assembly to limit the current in the circuit; Support structure; An inter-turn coil assembly is fixed on the support structure, and a conductor is wound around the outer wall of the support structure with multiple turns of coil to form an inter-turn winding; A voltage-dividing capacitor network, in which a capacitor is connected in series between every two adjacent turns of the inter-turn coil assembly to adjust and distribute the voltage; A voltage monitoring system is used to measure and record the voltage between each turn in the inter-turn coil assembly in real time.

2. The device for simulating the continuous breakdown of multiple turns of a reactor winding according to claim 1, characterized in that: Preferably, the inter-turn coil assembly is wound from copper wire coated with insulating material.

3. The device for simulating the continuous breakdown of multiple turns of a reactor winding according to claim 1, characterized in that: In the inter-turn coil assembly, defects can be introduced between two adjacent turns of the coil, thereby simulating different fault scenarios.

4. The device for simulating the continuous breakdown of multiple turns of a reactor winding according to claim 1, characterized in that: The voltage-dividing capacitor network includes an adjustable capacitor.

5. The device for simulating the continuous breakdown of multiple turns of a reactor winding according to claim 4, characterized in that: The inter-turn coil assembly has a total of four turns, which are marked as the 1st, 2nd, 3rd and 4th turns from bottom to top, forming three turn gaps. Each turn gap is connected in series with an adjustable capacitor, which are marked as capacitor C1, capacitor C2 and capacitor C3 respectively.

6. The device for simulating the continuous breakdown of multiple turns of a reactor winding according to claim 5, characterized in that: The voltages of the three turn gaps are inversely proportional to the capacitive reactances of the corresponding capacitors C1 , C2 , and C3 .

7. The device for simulating the continuous breakdown of multiple turns of a reactor winding according to claim 5, characterized in that: The voltage distribution between turns is adjusted by adjusting the capacitance values of capacitors C1, C2, and C3 to simulate the uneven voltage distribution under different working conditions.

8. The device for simulating the continuous breakdown of multiple turns of a reactor winding according to claim 1, characterized in that: The protective resistor is a water resistor, and the resistance value is changed by changing the solute concentration.

9. The device for simulating the continuous breakdown of multiple turns of a reactor winding according to claim 1, characterized in that: The voltage monitoring system includes a voltage sensor and an oscilloscope for real-time monitoring of voltage changes across each coil turn. The voltage sensor transmits data to the oscilloscope for recording and analysis.

10. A test method for a device simulating continuous breakdown of multiple turns of a reactor winding according to any one of claims 1 to 9.

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