GIS dynamic test device and method based on intelligent voltage regulation and real-time monitoring

Abstract

The invention discloses a GIS dynamic test device and method based on intelligent voltage regulation and real-time monitoring, and belongs to the technical field of high-voltage switch monitoring and simulation analysis, and the device comprises a variable-frequency voltage regulation unit which has an input end connected with a power frequency power supply and an output end connected with a test transformation unit and is used for generating a continuously adjustable test power supply; the test voltage transformation unit is used for boosting to a target test voltage according to an insulation test requirement; the resonance feedback unit is used for collecting the test voltage of the GIS equipment to be tested to obtain the test voltage; the intelligent control unit is used for acquiring required values of capacitance and inductance according to the resonant frequency of the GIS equipment to be tested; and the test transformation unit is automatically tracked. The multi-stage adjustable transformer and the capacitive voltage divider are combined, the output voltage is automatically adjusted according to the test parameters output by the simulation model, and the accuracy of the dynamic test is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage switch monitoring and simulation analysis, and more specifically, relates to a GIS dynamic test device and method based on intelligent voltage regulation and real-time monitoring. Background Art

[0002] During long-term operation, GIS equipment may develop defects such as residual metal particles, contact oxide layers, and gas contamination. These defects can cause partial discharge and induce transient overvoltages. Withstand voltage testing is an important means of ensuring the insulation performance of equipment. During the test, the equipment's capacitance changes significantly with the opening and closing of circuit breakers and disconnectors, leading to overvoltage and damage to the test equipment. In recent years, State Grid Corporation has experienced 45 insulation failures during operation of active gas chamber components such as circuit breakers and disconnectors in its 330 kV and above ultra-high voltage GIS equipment, accounting for 46.7% of all failures. These failures are more frequent after the circuit breaker is switched to hot standby mode, with the time interval between failures exceeding one minute. The continued prevalence of operational failures poses a serious threat to the normal operation of the power grid and its operational adjustments.

[0003] Among them, the main reasons for frequent operational failures include:

[0004] 1. The operating conditions during equipment operation are harsh, and the operation brings mechanical vibration, airflow disturbance, electromagnetic transient process and other phenomena, which easily trigger potential defects of stress-bearing components such as closing resistors, shunt capacitors, and insulating rods.

[0005] 2. Operation causes the probability of foreign matter movement and discharge to increase. The results of the GIS real-type test show that mechanical shock vibration can significantly reduce the take-off field strength of various metal foreign matters. Under 80g vibration excitation, the take-off field strength can be reduced by more than 50%. Vibration also significantly enhances the activity of metal foreign matter movement, increases the flight altitude, and even promotes the formation of multi-star series discharge phenomenon among multiple particles, thereby reducing the breakdown voltage.

[0006] 3. The existing test and assessment methods are imperfect. For many years, the on-site insulation test method for GIS equipment has still used the main circuit AC withstand voltage test (static) and ultrasonic partial discharge detection. There are insufficient means to assess the insulation during the operation of the active gas chamber, making detection difficult; factory and on-site AC withstand voltage cannot simulate various actual operating conditions such as live opening and closing, making it difficult to effectively detect potential defects that are sensitive to operating conditions, and it is difficult to provide a true picture of the equipment's insulation margin and tolerance performance.

[0007] Therefore, there is an urgent need for a device that can effectively perform pressure resistance tests on GIS equipment to reduce problems that occur during the use of GIS equipment. Summary of the Invention

[0008] In view of the above-mentioned deficiencies or those existing in the prior art, the present invention proposes a GIS dynamic testing device and method based on intelligent voltage regulation and real-time monitoring, which enables the use of active air chamber AC withstand voltage test instead of static withstand voltage test in the handover process of newly installed GIS equipment, thereby better simulating the operating conditions of GIS. At the same time, the action and static insulation strength of newly installed GIS equipment and those after fault repair are assessed to ensure that the equipment is defect-free after repair.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0010] In a first aspect, the present invention provides a GIS dynamic test device based on intelligent voltage regulation and real-time monitoring, comprising:

[0011] The frequency conversion and voltage regulation unit has an input end connected to the industrial frequency power supply and an output end connected to the test voltage conversion unit, which is used to generate a continuously adjustable test power supply;

[0012] Test transformer unit, used to boost the voltage to the target test voltage according to insulation test requirements;

[0013] The resonant feedback unit is used to collect the test voltage of the GIS equipment to be tested and obtain the test voltage;

[0014] The intelligent control unit obtains the required capacitance and inductance values according to the resonant frequency of the GIS equipment to be tested; and automatically tracks the test transformer unit;

[0015] The input end of the frequency conversion and voltage regulation unit is connected to the industrial frequency power supply, the output end of the frequency conversion and voltage regulation unit is connected to the test transformer unit, the output end of the test transformer unit is connected to the GIS device to be tested, the GIS device to be tested is also connected to the resonant feedback unit, the output end of the resonant feedback unit is connected to the intelligent control unit; the output end of the intelligent control unit is connected to the frequency conversion and voltage regulation unit.

[0016] As a further technical solution of the present invention, the resonant feedback unit includes:

[0017] A compensation capacitor group and a voltage divider are arranged in parallel on the test circuit, a voltage transformer is provided on the voltage divider, and a high-frequency current sensor is provided on the grounding branch of the compensation capacitor group to capture partial discharge signals. The output ends of the voltage transformer and the high-frequency current sensor are connected to the intelligent control unit through a digital signal processor.

[0018] As a further technical solution of the present invention, the test transformer unit includes:

[0019] A test transformer and an adjustable reactor, wherein the input end of the test transformer is connected to the frequency conversion and voltage regulation unit, the output end of the test transformer is connected to the adjustable reactor, and the output end of the adjustable reactor is connected to the GIS device to be tested.

[0020] As a further technical solution of the present invention, the adjustable reactor includes at least three parallel-connected magnetic valve controllable reactor units, each unit including:

[0021] Saturated iron core, made of amorphous alloy strip;

[0022] A DC bias winding connected to a programmable DC source of an intelligent tuning control unit;

[0023] The AC main winding is connected in series in the test circuit; the magnetic permeability of the iron core is changed by adjusting the DC bias current to achieve continuous adjustment of the inductance value.

[0024] As a further technical solution of the present invention, the adjustable reactor and the voltage divider are an integrated structure, and the top cover of the voltage divider adopts an inflatable shielding ring.

[0025] As a further technical solution of the present invention, the test transformer includes a first-stage test transformer, a second-stage test transformer and a third-stage test transformer, wherein:

[0026] The secondary winding of the first-stage test transformer is mechanically fixed by a first insulating support and electrically connected to the primary winding of the second-stage test transformer;

[0027] The secondary winding of the second-stage test transformer is mechanically fixed by a second insulating support and electrically connected to the primary winding of the third-stage test transformer;

[0028] An adjustable reactor is connected in series to the output end of the secondary winding of the third-stage test transformer, and the iron core of each stage of the transformer adopts a stepped magnetic circuit cross-sectional area design to optimize the leakage magnetic distribution.

[0029] As a further technical solution of the present invention, the intelligent tuning control unit includes: a resonant frequency calculation module, which dynamically calculates the equivalent capacitance C of the test loop based on the real-time sampling value of the voltage transformer eq and equivalent inductance L eq ; The adaptive resonant controller generates the target inductance value L of the adjustable reactor according to the following formula target :

[0030] ;

[0031] where f res is the preset resonant frequency;

[0032] Overload protection module, when it detects that the loop current or voltage exceeds the threshold, it triggers the emergency lock of the frequency conversion and voltage regulation unit;

[0033] The driving end of the adjustable reactor is connected to the PWM output port of the adaptive resonance controller to achieve closed-loop regulation of the inductance value.

[0034] As a further technical solution of the present invention, the overload protection module performs the following priority actions:

[0035] Action 1: When a transient overvoltage is detected, the thyristor crowbar circuit connected in parallel at both ends of the compensation capacitor bank is triggered to discharge energy;

[0036] Action 2: When a continuous overcurrent is detected, a PWM duty cycle signal with a decreasing gradient is generated to the IGBT gate driver of the variable frequency voltage regulation unit;

[0037] When action 1 and action 2 fail and the fault lasts for more than 200ms, the power supply input is cut off and the mechanical tripping mechanism is started.

[0038] In a second aspect, the present invention provides a GIS dynamic test method based on intelligent voltage regulation and real-time monitoring, comprising:

[0039] Generate continuously adjustable test power through frequency conversion and voltage regulation unit;

[0040] The test transformer unit boosts the voltage to the target test voltage according to the insulation test requirements;

[0041] The resonant feedback unit collects the test voltage of the GIS equipment to be tested to obtain the test voltage;

[0042] The intelligent control unit obtains the required values of capacitance and inductance according to the resonant frequency of the GIS equipment to be tested, and automatically tracks the test transformer unit.

[0043] The beneficial effects of the present invention are:

[0044] 1. The present invention adopts a combination of a multi-stage adjustable transformer and a capacitive voltage divider to achieve continuous adjustment of the test voltage within the range of 100kV to 800kV;

[0045] 2. Automatically adjust the output voltage according to the test parameters output by the simulation model to ensure the accuracy of the dynamic test;

[0046] 3. During the test, key parameters such as voltage, current, and partial discharge signals are collected in real time and transmitted to the control center through a high-speed data acquisition system;

[0047] 4. When abnormal discharge or overcurrent is detected, the test power supply will be automatically cut off and the fault characteristics will be recorded;

[0048] 5. The voltage regulation unit, monitoring unit and protection unit are designed as independent modules, which can be flexibly combined according to test requirements. The combination of intelligent voltage regulation and real-time monitoring solves the problem that traditional test equipment cannot adapt to dynamic test requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 labor.

[0050] Figure 1 A structural diagram of a GIS dynamic test device based on intelligent voltage regulation and real-time monitoring provided by an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the installation of a GIS dynamic test device based on intelligent voltage regulation and real-time monitoring provided by an embodiment of the present invention.

[0052] Figure 3 Flowchart of the GIS dynamic test method based on intelligent voltage regulation and real-time monitoring provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0054] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0055] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention should be

[0056] The ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] As used herein, "one embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0060] Example 1

[0061] Reference below Figures 1 and 2 It should be noted that the embodiments of the present invention can be applied to any applicable scenario.

[0062] Figure 1 The GIS dynamic test device based on intelligent voltage regulation and real-time monitoring provided by one embodiment of the present invention includes:

[0063] The frequency conversion and voltage regulation unit 101 has an input end connected to the industrial frequency power supply and an output end connected to the test voltage conversion unit, and is used to generate a continuously adjustable test power supply;

[0064] The test transformer unit 102 is used to boost the voltage to the target test voltage according to the insulation test requirements;

[0065] The resonant feedback unit 103 is used to collect the test voltage of the GIS device to be tested to obtain the test voltage;

[0066] The intelligent control unit 104 obtains the required values of capacitance and inductance according to the resonant frequency of the GIS device to be tested; and automatically tracks the test transformer unit;

[0067] The input end of the frequency conversion and voltage regulation unit 101 is connected to the industrial frequency power supply, the output end of the frequency conversion and voltage regulation unit 101 is connected to the test transformer unit 102, the output end of the test transformer unit 102 is connected to the GIS device to be tested, and the GIS device to be tested is also connected to the resonant feedback unit 103, the output end of the resonant feedback unit 103 is connected to the intelligent control unit 104; the output end of the intelligent control unit 104 is connected to the frequency conversion and voltage regulation unit 101.

[0068] In an embodiment of the present invention, a frequency conversion and voltage regulation unit is used to frequency-convert and voltage-regulate an input industrial frequency power supply to output a test voltage, and then the test voltage is boosted to a target test voltage by a test transformer unit to test the GIS device to be tested. The GIS device to be tested is also connected to a resonance feedback unit for collecting the target test voltage and feeding it back to an intelligent control unit. The intelligent control unit calculates the required values of capacitance and inductance according to the resonant frequency. The frequency conversion and voltage regulation unit and the test transformer unit are controlled to lock the frequency while the adjustable reactance is automatically tracked and controlled to meet the resonant frequency requirement. If the capacitance value suddenly decreases and the resonant frequency is destroyed, the control console automatically adjusts the adjustable reactance and inductance values to re-establish resonance and protect the device.

[0069] The intelligent control unit simultaneously sets or adjusts the overcurrent or overvoltage protection action capability.

[0070] In an embodiment of the present invention, the test transformer unit 102 includes: a test transformer 121 and an adjustable reactor 122. The input end of the test transformer 121 is connected to the frequency conversion and voltage regulation unit 101, the output end of the test transformer 121 is connected to the adjustable reactor 122, and the output end of the adjustable reactor 122 is connected to the GIS device to be tested.

[0071] The resonant feedback unit 103 includes: a compensation capacitor group 131 and a voltage divider 132 arranged in parallel on the test circuit, a voltage transformer 133 is provided on the voltage divider 132, and a high-frequency current sensor 134 is provided on the grounding branch of the compensation capacitor group 131 for capturing partial discharge signals. The output ends of the voltage transformer 133 and the high-frequency current sensor 134 are connected to the intelligent control unit through a digital signal processor 135. The adjustable inductor 122 and the voltage divider 132 are an integrated structure, and the top cover of the voltage divider adopts an inflatable shielding ring.

[0072] See also Figure 2 In an embodiment of the present invention, the test transformer adopts a multi-stage transformer structure, and the multi-stage transformer is supported by setting an insulating support platform. The test transformer raises the low voltage to the high-voltage target voltage. By setting the support platform, a certain electrical safety distance is met to prevent air breakdown around the test transformer, which may cause a high-voltage arc electric shock hazard. The test transformer 121 includes a first-stage test transformer 1211, a second-stage test transformer 1212 and a third-stage test transformer 1213, and the three-stage test transformers are gradually increased in height; the secondary winding of the first-stage test transformer 1211 is mechanically fixed by a first insulating support 123 and electrically connected to the primary winding of the second-stage test transformer 1212; the secondary winding of the second-stage test transformer 1212 is mechanically fixed by a second insulating support 124 and electrically connected to the primary winding of the third-stage test transformer 1213; the output end of the secondary winding of the third-stage test transformer 1213 is connected in series with an adjustable inductor 122, and the iron core of each stage of the transformer adopts a stepped magnetic circuit cross-sectional area design to optimize the leakage magnetic distribution.

[0073] In the embodiment of the present invention, the intelligent control unit 104 includes: a resonant frequency calculation module 141, which dynamically calculates the equivalent capacitance C of the test circuit based on the real-time sampling value of the voltage transformer. eq and equivalent inductance L eq Adaptive resonant controller 142 generates the target inductance value L of the adjustable reactor according to the following formula target :

[0074] ;

[0075] where f res is the preset resonant frequency;

[0076] The overload protection module 143 triggers the emergency lockout of the variable frequency voltage regulation unit when detecting that the loop current or voltage exceeds a threshold value;

[0077] The driving end of the adjustable reactor is connected to the PWM output port of the adaptive resonant controller to achieve closed-loop regulation of the inductance value.

[0078] Among them, the overload protection module performs the following priority actions:

[0079] Action 1: When a transient overvoltage is detected, the thyristor crowbar circuit connected in parallel at both ends of the compensation capacitor bank is triggered to discharge energy;

[0080] Action 2: When a continuous overcurrent is detected, a PWM duty cycle signal with a decreasing gradient is generated to the IGBT gate driver of the variable frequency voltage regulation unit;

[0081] When action 1 and action 2 fail and the fault lasts for more than 200ms, the power supply input is cut off and the mechanical tripping mechanism is started.

[0082] In an embodiment of the present invention, the adjustable reactor includes at least three parallel-connected magnetic valve controllable reactor units, each unit including:

[0083] Saturated iron core, made of amorphous alloy strip;

[0084] A DC bias winding connected to a programmable DC source of an intelligent tuning control unit;

[0085] The AC main winding is connected in series in the test circuit;

[0086] By adjusting the DC bias current to change the core magnetic permeability, the inductance value can be continuously adjusted.

[0087] This device can meet on-site withstand voltage and partial discharge (PD) tests at 110kV (withstand voltage 230kV), 220kV (withstand voltage 460kV), 330kV (withstand voltage 520kV), and 750kV (PD measurement value 554kV). Furthermore, the opening and closing of active gas chambers in disconnectors and circuit breakers between 110kV and 750kV (PD measurement value 554kV) will not cause overcurrent or overvoltage in the test equipment. The load capacitance range is 1nF to 30nF at 40kV. The current is 5.4A; the high-voltage adjustable compensating reactor is rated at 600kV and 6A.

[0088] The present invention provides a GIS dynamic test device based on intelligent voltage regulation and real-time monitoring, which covers the 750kV equipment withstand test voltage of 960kV. The specific configuration parameters are as follows:

[0089] Cascade transformer: 500kV, 3.5m; 2 sections reach 1000kV, total height 7m, assembled on site;

[0090] Cascade transformer: 350kV, 2.6m; 3 sections of 1050kV, total height 7.8m, assembled on site;

[0091] Supplementary capacitor: 1000kV, 3nF; assembled on site;

[0092] Compensating resistor: 1000kV, 3 sections, inductance: 80H-10000H, about 7m, on-site assembly;

[0093] Overvoltage protection resistor: 1000kV.

[0094] Example 2

[0095] See also Figure 3 The present invention provides a GIS dynamic test method based on intelligent voltage regulation and real-time monitoring, comprising:

[0096] Step 201: Generate a continuously adjustable test power supply through a variable frequency voltage regulation unit;

[0097] Step 202: The test transformer unit boosts the voltage to the target test voltage according to the insulation test requirements;

[0098] Step 203: The resonant feedback unit collects the test voltage of the GIS device to be tested to obtain the test voltage;

[0099] Step 204: The intelligent control unit obtains required values of capacitance and inductance according to the resonant frequency of the GIS device to be tested; and automatically tracks the test transformer unit.

[0100] The various variations and specific examples of a GIS dynamic testing device based on intelligent voltage regulation and real-time monitoring in the aforementioned embodiment are also applicable to a GIS dynamic testing method based on intelligent voltage regulation and real-time monitoring in this embodiment. Through the aforementioned detailed description of a GIS dynamic testing device based on intelligent voltage regulation and real-time monitoring, those skilled in the art can clearly understand a GIS dynamic testing method based on intelligent voltage regulation and real-time monitoring in this embodiment, so for the sake of brevity of the specification, it will not be described in detail here.

[0101] This invention combines a multi-stage adjustable transformer with a capacitive voltage divider to achieve continuous adjustment of the test voltage within a range of 100kV to 800kV. The output voltage is automatically adjusted based on test parameters (such as voltage level and equivalent capacitance) output by the simulation model to ensure the accuracy of dynamic testing. During the test, key parameters such as voltage, current, and partial discharge signals are collected in real time and transmitted to a control center via a high-speed data acquisition system. When abnormal discharge or overcurrent is detected, the test power supply is automatically cut off and the fault characteristics are recorded. The voltage regulation unit, monitoring unit, and protection unit are designed as independent modules, allowing for flexible combination based on test requirements. The standardized interface supports rapid installation and removal, improving the equipment's field suitability. By combining intelligent voltage regulation with real-time monitoring, this system overcomes the problem of traditional test equipment being unable to adapt to dynamic testing requirements.

[0102] Furthermore, although the operations of the method of the present invention are described in a particular order in the accompanying drawings, this does not require or imply that these operations must be performed in this particular order, or that all illustrated operations must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

Claims

1. GIS dynamic test device based on intelligent voltage regulation and real-time monitoring, characterized by: include: The frequency conversion and voltage regulation unit has an input end connected to the industrial frequency power supply and an output end connected to the test voltage conversion unit, which is used to generate a continuously adjustable test power supply; Test transformer unit, used to boost the voltage to the target test voltage according to insulation test requirements; The resonant feedback unit is used to collect the test voltage of the GIS equipment to be tested and obtain the test voltage; The intelligent control unit obtains the required capacitance and inductance values according to the resonant frequency of the GIS equipment to be tested; and automatically tracks the test transformer unit; The input end of the frequency conversion and voltage regulation unit is connected to the industrial frequency power supply, the output end of the frequency conversion and voltage regulation unit is connected to the test transformer unit, the output end of the test transformer unit is connected to the GIS device to be tested, the GIS device to be tested is also connected to the resonant feedback unit, the output end of the resonant feedback unit is connected to the intelligent control unit; the output end of the intelligent control unit is connected to the frequency conversion and voltage regulation unit.

2. The GIS dynamic test device based on intelligent voltage regulation and real-time monitoring according to claim 1 is characterized in that: The resonant feedback unit includes: A compensation capacitor group and a voltage divider are arranged in parallel on the test circuit, a voltage transformer is provided on the voltage divider, and a high-frequency current sensor is provided on the grounding branch of the compensation capacitor group to capture partial discharge signals. The output ends of the voltage transformer and the high-frequency current sensor are connected to the intelligent control unit through a digital signal processor.

3. The GIS dynamic test device based on intelligent voltage regulation and real-time monitoring according to claim 1 is characterized in that: The test transformer unit comprises: A test transformer and an adjustable reactor, wherein the input end of the test transformer is connected to the frequency conversion and voltage regulation unit, the output end of the test transformer is connected to the adjustable reactor, and the output end of the adjustable reactor is connected to the GIS device to be tested.

4. The GIS dynamic test device based on intelligent voltage regulation and real-time monitoring according to claim 3 is characterized in that: The adjustable reactor includes at least three parallel-connected magnetic valve controllable reactor units, each unit including: Saturated iron core, made of amorphous alloy strip; A DC bias winding connected to a programmable DC source of an intelligent tuning control unit; The AC main winding is connected in series in the test circuit; the magnetic permeability of the iron core is changed by adjusting the DC bias current to achieve continuous adjustment of the inductance value.

5. The GIS dynamic test device based on intelligent voltage regulation and real-time monitoring according to claim 3 is characterized in that: The adjustable reactor and the voltage divider are an integrated structure, and the top cover of the voltage divider adopts an inflatable shielding ring.

6. The GIS dynamic test device based on intelligent voltage regulation and real-time monitoring according to claim 3 is characterized in that: The test transformer includes a first-stage test transformer, a second-stage test transformer and a third-stage test transformer, wherein: The secondary winding of the first-stage test transformer is mechanically fixed by a first insulating support and electrically connected to the primary winding of the second-stage test transformer; The secondary winding of the second-stage test transformer is mechanically fixed by a second insulating support and electrically connected to the primary winding of the third-stage test transformer; An adjustable reactor is connected in series to the output end of the secondary winding of the third-stage test transformer, and the iron core of each stage of the transformer adopts a stepped magnetic circuit cross-sectional area design to optimize the leakage magnetic distribution.

7. The GIS dynamic test device based on intelligent voltage regulation and real-time monitoring according to claim 1 is characterized in that: The intelligent tuning control unit includes: a resonant frequency calculation module that dynamically calculates the equivalent capacitance C of the test loop based on the real-time sampling value of the voltage transformer. eq and equivalent inductance L eq ; Adaptive resonant controller generates the target inductance value L of the adjustable reactor according to the following formula target : ； where f res is the preset resonant frequency; Overload protection module, when it detects that the loop current or voltage exceeds the threshold, it triggers the emergency lock of the frequency conversion and voltage regulation unit; The driving end of the adjustable reactor is connected to the PWM output port of the adaptive resonance controller to achieve closed-loop regulation of the inductance value.

8. The GIS dynamic test device based on intelligent voltage regulation and real-time monitoring according to claim 7 is characterized in that: The overload protection module performs the following priority actions: Action 1: When a transient overvoltage is detected, the thyristor crowbar circuit connected in parallel at both ends of the compensation capacitor bank is triggered to discharge energy; Action 2: When a continuous overcurrent is detected, a PWM duty cycle signal with a decreasing gradient is generated to the IGBT gate driver of the variable frequency voltage regulation unit; When action 1 and action 2 fail and the fault lasts for more than 200ms, the power supply input is cut off and the mechanical tripping mechanism is started.

9. A GIS dynamic test method based on intelligent voltage regulation and real-time monitoring, characterized in that: A GIS dynamic test device based on intelligent voltage regulation and real-time monitoring as described in any one of claims 1 to 8 is used, comprising: Generate continuously adjustable test power through frequency conversion and voltage regulation unit; The test transformer unit boosts the voltage to the target test voltage according to the insulation test requirements; The resonant feedback unit collects the test voltage of the GIS equipment to be tested to obtain the test voltage; The intelligent control unit obtains the required values of capacitance and inductance according to the resonant frequency of the GIS equipment to be tested, and automatically tracks the test transformer unit.

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