A GIS / GIL equipment mechanical vibration simulation system and method

Abstract

The present invention provides a GIS / GIL equipment mechanical vibration simulation system and method thereof, comprising a GIS / GIL equipment mechanical defect simulation unit, a sweep frequency injection unit, a voltage and current generating unit, a multi-channel vibration test and structural modal analysis unit and a human-computer interaction control unit; the GIS / GIL equipment mechanical defect simulation unit comprises a main circuit formed by a combination of true gas chambers of the GIS / GIL equipment; the sweep frequency injection unit is used to inject a sweep frequency power supply into the main circuit; the voltage and current generating unit is used to apply a voltage load to the main circuit and inject a power frequency current; the multi-channel vibration test and structural modal analysis unit is used to collect the status information of the GIS / GIL equipment and perform defect identification and modal analysis and feed back the identification and analysis results to the human-computer interaction and control unit; the human-computer interaction and control unit is used to display the identification and analysis results. The present invention provides technical support for effectively detecting mechanical vibration defects of GIS / GIL equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical detection, and in particular relates to a GIS / GIL equipment mechanical vibration simulation system and a method thereof. Background Art

[0002] Gas insulated switchgear (GIS) and gas insulated transmission line (GIL) are reliable, safe, easy to maintain, and space-intensive. According to the "Compilation of Typical Fault Cases of High-voltage Switchgear" of the State Grid, mechanical and insulation defects are the main causes of power accidents in GIS / GIL equipment. Long-term mechanical vibration defects will cause hazards such as gas leakage, circuit temperature rise, and insulation aging damage, and gradually develop and even lead to accidents such as conductor short circuit and insulation breakdown. The detection and identification of mechanical vibration defects in GIS / GIL equipment has always been a key technical problem in the operation and maintenance of GIS / GIL equipment. Therefore, it is an important measure to effectively detect mechanical vibration defects in GIS / GIL equipment and ensure its safe and stable operation to simulate the mechanical vibration characteristics of GIS / GIL equipment and understand the law of mechanical vibration state changes in GIS / GIL equipment.

[0003] Traditional simulation and research on the vibration characteristics of GIS / GIL equipment are mostly based on a scaled model of a single air chamber.

[0004] The utility model patent "A vibration characteristic simulation and detection device for GIS equipment" provides a vibration characteristic simulation and detection device based on the busbar cavity of GIS equipment, but it can only simulate transient vibration signals and cannot simulate the actual operating conditions under the action of voltage and current. The invention patent "A vibration detection device for GIS under simulated operating conditions" provides a vibration simulation platform and device for GIS equipment that adjusts the thickness and length of the connecting rod to simulate the operating conditions, but it only focuses on the busbar air chamber. The invention patent "A GIS equipment defect simulation and analysis device and method" provides an operating vibration simulation system that integrates a GIS equipment simulation device, vibration and partial discharge sensors, a voltage source and a data acquisition card, but the air chamber has a single function and can only achieve voltage loading. In summary, the busbar vibration simulation system still has the following shortcomings, mainly in two aspects:

[0005] On the one hand, there are many internal components of GIS / GIL equipment, including circuit breakers, disconnectors, grounding switches, current transformers, voltage transformers (i.e., booster chambers), lightning arresters, busbars, connecting pipes, and transition elements. The defect forms, geometric structures, and constraint states of different components are quite different. In addition, the size and structure of GIS / GIL equipment vary greatly. Especially in long-distance transmission corridor projects, the busbar structure is often designed in different sizes according to environmental needs, or different support methods are used, and its vibration characteristics are also different. On the other hand, there are a large number of nonlinear components in the power system, and a large number of power electronic equipment are connected to the user side. There are certain harmonic current components in the power grid. Harmonic currents will not only increase equipment losses, shorten equipment life, and cause switch malfunctions, but also cause changes in the vibration phenomenon of the equipment. In particular, when the frequency of the electromagnetic force generated by the system harmonic current is close to or equal to the modal frequency of the internal components of the chamber, it will cause strong mechanical resonance in the GIS / GIL equipment, thereby destroying the insulation or mechanical properties of the equipment. However, there is no report on the vibration simulation system and vibration characteristics of GIS / GIL equipment under the action of harmonic currents. Summary of the invention

[0006] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a GIS / GIL equipment mechanical vibration simulation system and method thereof, so as to provide technical support for effectively detecting mechanical vibration defects of GIS / GIL equipment.

[0007] The technical solution adopted by the present invention is: a GIS / GIL equipment mechanical vibration simulation system, including a GIS / GIL equipment mechanical defect simulation unit, a sweep frequency injection unit, a voltage and current generation unit, a multi-channel vibration test and structural modal analysis unit and a human-computer interaction control unit;

[0008] Among them, the GIS / GIL equipment mechanical defect simulation unit includes a main circuit formed by a combination of true-type gas chambers of the GIS / GIL equipment;

[0009] The sweep frequency injection unit is used to inject the sweep frequency power into the main circuit;

[0010] The voltage and current generating unit is used to apply voltage load to the main circuit and inject power frequency current;

[0011] The multi-channel vibration test and structural modal analysis unit is used to collect the status information of GIS / GIL equipment and perform defect identification and modal analysis and feed back the identification and analysis results to the human-computer interaction and control unit;

[0012] The human-computer interaction and control unit is used to display the identification and analysis results, and generate control instructions based on the identification and analysis results and send them to the GIS / GIL equipment mechanical defect simulation unit, sweep frequency injection unit, and voltage and current generation unit.

[0013] In the above technical scheme, the main circuit includes a circuit breaker gas chamber, an isolating switch gas chamber, an isolating grounding switch gas chamber, a current transformer gas chamber, a voltage transformer gas chamber, a lightning arrester gas chamber, a busbar gas chamber, a high-voltage bushing and various connection structures and transition elements connected in series; each true-type gas chamber is filled with SF6 insulating gas of standard pressure; the internal components of each equipment in the main circuit are set to wear, looseness, fatigue mechanical defects through vacuuming and structural disassembly of each true-type gas chamber.

[0014] In the above technical solution, the busbar air chamber includes multiple busbar air chambers of different sizes and are equipped with different numbers of detachable sliding brackets; the detachable sliding brackets are used to support the structure of the busbar air chamber; the busbar air chamber support structure and stress state are adjusted by setting the position and number of sliding brackets.

[0015] In the above technical scheme, the swept frequency injection unit includes a three-phase power supply, a rectifier, an inverter and a filter connected in series in sequence; the output end of the filter is connected in parallel to the two ends of the isolating switch air chamber, and is used to output the swept frequency power supply to the main circuit; the rectifier converts the three-phase power supply into a DC signal and outputs it to the inverter, the inverter converts the DC signal into a PWM AC signal of a corresponding frequency and outputs it to the filter, the filter filters out the high-frequency component of the PWM signal, and obtains a smooth sinusoidal signal of a corresponding frequency to be injected into the main circuit; the frequency of the inverter output signal is continuously controlled by the human-computer interaction and control unit; the human-computer interaction and control unit accesses the output signals of the inverter and the filter for feedback adjustment.

[0016] In the above technical solution, the voltage and current generating unit includes a transformer circuit; the transformer circuit includes a test transformer and a capacitor; the external voltage is boosted by the test transformer and filtered by the capacitor and then injected into the main circuit through the high-voltage bushing air chamber.

[0017] In the above technical solution, the voltage and current generating unit includes a current boosting circuit, which includes a voltage regulator and a capacitor; the external voltage is electrically connected to the input end of the voltage regulator, and the output current of the voltage regulator flows into the current transformer air chamber after filtering by the capacitor, and the main circuit power frequency high current is injected through induction current boosting.

[0018] The above technical solution also includes a grounding protection unit; when the grounding protection unit is connected to the main circuit, the main circuit is in a disconnected state, and each device in the main circuit is grounded through the grounding protection unit.

[0019] In the above technical scheme, the multi-channel vibration test and structural modal analysis unit includes a multi-channel piezoelectric accelerometer, an NI high-speed data acquisition unit and a signal detection identification and SignalPad modal analysis module; the multi-channel piezoelectric accelerometer is arranged on the shell of the GIS / GIL equipment and the collected status information of the GIS / GIL equipment is sent to the signal detection identification and SignalPad modal analysis module after pre-processing by the NI high-speed data acquisition unit, and the signal detection identification and SignalPad modal analysis module realizes defect identification and modal analysis functions.

[0020] The present invention provides a method for simulating mechanical vibration of GIS / GIL equipment, comprising the following steps:

[0021] a. Disassemble or set up each equipment air chamber and component in the main circuit of the mechanical defect simulation unit of the GIS / GIL equipment according to the experimental requirements, make electrical connections to the main circuit after completion, and arrange the voltage and current generating unit, the sweep frequency injection unit, and the multi-channel vibration test and structural modal analysis unit; select to execute step b or step c according to the experimental requirements;

[0022] b. Connect the voltage and current generating unit to the main circuit and isolate the frequency sweep injection unit from the main circuit; the voltage and current generating unit applies voltage load and injects power frequency current to the main circuit;

[0023] c. Connect the sweep frequency injection unit to the main circuit and isolate the voltage and current generating unit from the main circuit; the voltage and current generating unit injects the sweep frequency power supply into the main circuit;

[0024] d. The multi-channel vibration test and structural modal analysis unit collects the status information generated by the GIS / GIL device in step b or c, performs defect identification and modal analysis, and feeds back the identification and analysis results to the human-computer interaction and control unit;

[0025] e. The human-computer interaction and control unit displays the identification and analysis results, and generates control instructions based on the identification and analysis results and sends them to the GIS / GIL equipment mechanical defect simulation unit, sweep frequency injection unit, and voltage and current generation unit.

[0026] In the above technical solution, in step b and step c, before connecting the voltage and current generating unit or the sweep frequency injection unit to the main circuit, ensure that the voltage protection and starting circuit of the main circuit are in the disconnected state, and connect the grounding protection unit; after the main circuit wiring is completed, check whether there is a short circuit or a broken line, and disconnect the grounding protection unit after confirmation.

[0027] The beneficial effects of the present invention are as follows: the present invention can realize the operation vibration simulation of GIS / GIL equipment with variable size and variable type components in normal or mechanical defect state, the variable frequency vibration law test of GIS / GIL equipment under harmonic current injection and variable load conditions, and the structural modal analysis test of different components of GIS / GIL equipment, which has great scientific research use value and engineering practical significance. Compared with the existing GIS / GIL equipment simulation platform, the present invention integrates multiple types of components of 500kV real GIS / GIL equipment, and designs busbar air chambers of different sizes in the main circuit, and configures multiple detachable sliding brackets, realizing the operation vibration simulation of busbars of different lengths and different types of components in normal or mechanical defect state. The present invention introduces a harmonic generator and a high-voltage and high-current generator, and designs a harmonic injection interface in the mechanical defect simulation unit of the GIS / GIL equipment, realizing the variable frequency vibration law test of GIS / GIL equipment under harmonic injection and variable load conditions. The present invention is equipped with a multi-channel vibration test and structural modal analysis device, realizing the structural modal analysis test of different components of the GIS / GIL equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a wiring diagram of a vibration simulation circuit of the operating condition of the GIS / GIL equipment of the present invention;

[0029] Figure 2 It is a wiring diagram of a vibration simulation circuit of a GIS / GIL device variable frequency excitation condition of the present invention;

[0030] Figure 3 It is the air chamber distribution diagram of the mechanical defect simulation unit of the GIS / GIL equipment of the present invention;

[0031] The figure includes: circuit breaker gas chamber (CB1), disconnector gas chamber (DS1, DS2), disconnector grounding switch gas chamber (DS1-ES1), grounding switch gas chamber (ES2), current transformer gas chamber (CT1, i.e. current booster gas chamber), voltage transformer gas chamber (PT1), lightning arrester gas chamber (LA), busbar (Line1~Line6), tees (TV1, TV2, TV3, TV4), 1-test transformer, 2-voltage regulator, 3-capacitor, 4-expansion joint.

[0032] Figure 4 It is a structural diagram of the swept frequency power supply device of the present invention;

[0033] Figure 5 The schematic diagram of the frequency sweeping power supply circuit of the present invention;

[0034] Figure 6a-6d Vibration waveform diagram of the GIS / GIL equipment mechanical defect simulation platform under different working conditions. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0036] like Figure 1-3 As shown, the present invention is mainly composed of a GIS / GIL equipment mechanical defect simulation unit, a sweep frequency injection unit, a voltage and current generation unit, a multi-channel vibration test and structural modal analysis unit, a grounding protection unit, and a human-computer interaction control unit.

[0037] Among them, the GIS / GIL equipment mechanical defect simulation unit includes a main circuit formed by a combination of true-type gas chambers of the GIS / GIL equipment;

[0038] The sweep frequency injection unit is used to inject the sweep frequency power into the main circuit;

[0039] The voltage and current generating unit is used to apply voltage load to the main circuit and inject power frequency current;

[0040] The multi-channel vibration test and structural modal analysis unit is used to collect the status information of GIS / GIL equipment and perform defect identification and modal analysis and feed back the identification and analysis results to the human-computer interaction and control unit;

[0041] The human-machine interaction and control unit is used to display the identification and analysis results, and generate control instructions based on the identification and analysis results and send them to the GIS / GIL equipment mechanical defect simulation unit, sweep frequency injection unit, and voltage and current generation unit;

[0042] The grounding protection unit is used to protect the safety of the main circuit. When connected to the main circuit, the main circuit is in a disconnected state, and each device in the main circuit is grounded through the grounding protection unit.

[0043] System structure and circuit diagram as shown below: Figure 1 , 2 As shown. The circuit mainly consists of the GIS / GIL equipment vibration simulation main circuit and peripheral equipment. The main circuit includes the circuit breaker gas chamber (CB1), the isolation grounding switch gas chamber (DS1-ES1), the grounding switch (ES2), the current transformer (CT1, i.e. the booster gas chamber), the voltage transformer gas chamber (PT1), the lightning arrester gas chamber (LA), the busbar gas chamber (Line1~Line6), and the high-voltage bushing BSG. The peripheral equipment includes the sweep frequency power supply generator (i.e. the sweep frequency injection unit), the transformer and the large current generator (i.e. the voltage and current generating unit).

[0044] The main circuit includes busbar gas chambers Line1 to Line6, circuit breaker gas chamber CB1, disconnector gas chamber DS1, current transformer gas chamber CT1 (i.e., booster gas chamber), high-voltage bushing BSG, and disconnecting grounding switch gas chambers DS1-ES1, which are connected in series with each other. The main circuit is electrically connected to the voltage transformer PT1 and lightning arrester LA, which are connected in series and grounded, through the disconnector gas chamber DS2. The sweeping frequency power supply (i.e., sweeping frequency access unit) is connected in parallel to both ends of the disconnector gas chamber DS1 through switch S1. The transformer circuit in the voltage and current generating unit includes a test transformer, a capacitor, and a high-voltage bushing. The test transformer is connected to the main circuit through the high-voltage bushing BSG via switch S2 and the capacitor. As shown by the arrow in the figure, the test transformer applies voltage to the main circuit through the high-voltage bushing BSG. The boosting circuit in the voltage and current generating unit includes a voltage regulator, a capacitor, and a booster. The external voltage is regulated by the voltage regulator and then connected to the current booster (i.e., the inductive current booster shown in the figure). As shown by the arrow in the figure, the output current of the current booster is filtered by the switch S3 and the capacitor and then injected into the main circuit through the current transformer chamber CT1. The isolation grounding switch DS1-ES1 is a single-pole double-throw switch, which realizes the switching between the main circuit closed state and the open and grounded state.

[0045] The distribution diagram of the circuit air chamber of the GIS / GIL equipment mechanical defect simulation unit is as follows: Figure 3 As shown, the main circuit includes the circuit breaker gas chamber, disconnector gas chamber, isolating grounding switch gas chamber, current transformer gas chamber, voltage transformer gas chamber, lightning arrester gas chamber, busbar, bushing, various connection structures and transition elements (including tees, bases, expansion joints and insulators, etc.). The main circuit adopts the real gas chamber of 500kV GIS / GIL equipment for combined design. The gas chamber of each device in the mechanical defect simulation unit of GIS / GIL equipment is filled with SF6 insulating gas of standard pressure, which can be set by exhausting and structural disassembly and setting mechanical defects such as wear, looseness and fatigue for internal components. GIS / GIL equipment, sweep frequency power supply generator, transformer and large current generator are uniformly grounded. The system has a built-in grounding protection unit to realize the self-cut-off protection function for working conditions such as breakdown, short circuit and misoperation.

[0046] like Figure 3As shown, the two tees TV1 and TV2 on the left side of the main circuit are respectively provided with input and output ports for connecting to the sweep frequency power supply generator. The two tees TV3 and TV4 on the left side of the main circuit are connected to the booster air chamber, and the tee TV4 in the lower right corner is provided with a voltage divider (i.e., test transformer) access port through a high-voltage bushing. The booster air chamber is the current access port, and the booster air chamber is connected to a voltage regulator. The loop bus adopts a multi-scale structure, and the busbar air chambers correspond to the main circuit Line1 to Line6, with lengths of 2m, 3m, 4m, 5m and 6m respectively. Among them, the long interval Line5 and Line6 are equipped with different numbers of detachable sliding brackets to achieve structural support for the busbar air chamber. The position and number of sliding brackets can be adjusted according to actual needs to achieve the adjustment of the busbar air chamber support structure and stress state.

[0047] The swept frequency current is injected into the unit cell to generate a swept frequency power supply. The device structure and circuit principle are as follows Figure 4 and Figure 5 As shown. The device mainly includes four components: rectifier, inverter, filter and controller. The rectifier converts the three-phase power supply into a DC signal through a bridge rectifier circuit composed of diodes VT1~VT6, and then converts it into a PWM AC signal of the corresponding frequency through the thyristor V1~V4 inverter circuit. Finally, the high-frequency component of the PWM signal is filtered out by the filter circuit to obtain a smooth sinusoidal signal of the corresponding frequency and inject it into the main circuit. The frequency of the inverter output signal is continuously controlled by the human-computer interaction and control unit, and the output signals of the inverter and filter are connected for feedback adjustment. The swept frequency power supply can provide a variable frequency AC output signal of 0~5000A, and the output frequency can be continuously controlled in the range of 0~2000Hz.

[0048] The voltage and current generating unit consists of a transformer circuit and a current boosting circuit. The transformer circuit includes a test transformer, a capacitor and a bushing. The external voltage is boosted by the test transformer and filtered by the capacitor before being injected into the main circuit through the high-voltage bushing. A voltage load in the range of 0 to 500 kV can be applied. The current boosting circuit includes a voltage regulator, a capacitor and a current booster chamber (i.e., the current transformer chamber in the main circuit). The three together with the main circuit form an inductive current boosting circuit, which can inject a power frequency current in the range of 0 to 5000 A.

[0049] The multi-channel vibration test and structural modal analysis unit consists of a multi-channel piezoelectric accelerometer (fixed on the equipment housing), an NI high-speed data acquisition unit, signal detection and identification, and SignalPad modal analysis software, which realizes dynamic data acquisition, AD conversion, defect identification, and modal analysis functions of vibration signals.

[0050] The human-machine interaction and control unit is used to realize the main circuit opening and closing control, the voltage and current rise and fall control of the voltage and current generating unit, the external vibration excitation control of the frequency sweeping access unit, and the vibration waveform and analysis result display function. The human-machine interaction and control unit maintains a certain safe distance from the main circuit to realize the remote control and display of the vibration test.

[0051] The working process of this specific embodiment is as follows:

[0052] Step 1: Setting of mechanical defects of GIS / GIL equipment and adjustment of supporting structure

[0053] The vibration of GIS / GIL equipment operating conditions can be divided into normal state and defect state. In the defect state, the main circuit of the system can be disassembled for different air chambers and components, and single or coupled settings of defect states such as loose bolts, poor contact, switch jamming, spring breakage, component wear, etc. can be carried out as needed. After the structure is restored, voltage and current loading and vibration detection can be carried out.

[0054] Specifically, the sliding support structures B1 to B5 of the GIL busbar air chambers Line5 and Line6 can be disassembled and moved according to the experimental requirements, and the GIL busbar air chambers can be set to multiple types of support constraints such as single-end, double-end or multi-end. The vibration detection sensor (i.e., multi-channel piezoelectric acceleration sensor) is arranged and installed according to the requirements and sampling points.

[0055] Step 2: Check the connection of the excitation device and the loop wiring

[0056] (1) Vibration simulation of GIS / GIL equipment operating conditions:

[0057] The vibration simulation of GIS / GIL equipment operating conditions is to simulate the vibration of the equipment under the action of power frequency voltage and current. The transformer circuit and the induction current boosting device are connected, and the sweep power supply device is isolated from the main circuit. The output voltage and current of the transformer circuit and the induction current boosting device are set through human-machine interaction and control unit. After the wiring and setting are completed, the simulation experiment is carried out. The main circuit connection is as follows Figure 1 As shown, switch S1 is disconnected, switches S2, S3 and isolating switch DS2 are all closed, isolating grounding switch DS1-ES1 is connected to the main circuit, and transformer circuit and inductive current raising device can be loaded singly or coupled according to experimental needs. Before connecting the main circuit, it should be ensured that the voltage protection and starting circuit are disconnected, and the grounding protection is started. After the connection is completed, check whether there is a short circuit and disconnection. After confirmation, remove the grounding electrode (i.e., grounding protection unit).

[0058] (2) GIS / GIL equipment vibration simulation under variable frequency excitation conditions:

[0059] Under the vibration simulation condition of GIS / GIL equipment under variable frequency excitation condition, the frequency sweeping power supply device is connected to the main circuit, and the transformer and induction current raising device are isolated from the main circuit. The output voltage of the frequency sweeping power supply is set through human-computer interaction and control unit, and the simulation experiment is carried out after the wiring and setting are completed. Figure 2 As shown, switch S1 is closed, switches S2, S3 and isolating switch DS2 are all disconnected, and isolating grounding switch DS1-ES1 is connected to the main circuit. Under variable frequency excitation of GIS / GIL equipment, the swept frequency power supply can apply a single frequency steady-state sinusoidal signal, a slow swept frequency steady-state sinusoidal signal, a fast swept frequency sinusoidal signal and a swept frequency sinusoidal burst signal to the main circuit to realize the study of the integral variable frequency vibration of the internal components of the main circuit. Before wiring the main circuit, it should be ensured that the voltage protection and the start-up circuit are disconnected, and the grounding protection is started. After the wiring is completed, check whether there is a short circuit and a broken line. After confirmation, remove the grounding electrode (i.e., the grounding protection unit).

[0060] Step 3: Vibration Detection and Signal Analysis

[0061] The sensor detection network composed of multi-channel piezoelectric acceleration sensors and the multi-channel vibration test acquisition unit are used to carry out dynamic collection of vibration signals, and the sampling rate and sampling time are set through the human-computer interaction and control unit according to actual needs to further realize signal spectrum analysis and identification of overall modal parameters of the structure. The human-computer interaction and control unit display the generated identification and analysis results.

[0062] After the vibration simulation test of the GIS / GIL equipment operating conditions is completed, the input voltage U i2 The main circuit current drops to zero and the circuit voltage is cut off, that is, switches S2 and S3 are disconnected.

[0063] After the detection of the vibration simulation of the GIS / GIL equipment under variable frequency excitation conditions is completed, the switch S1 is disconnected.

[0064] This specific embodiment provides a defect testing platform test example. Figure 6a-6d The simulation platform is only loaded with 50Hz current (such as Figure 6a As shown), 50Hz current and voltage coupling loading is normal (as shown Figure 6b As shown), guide rod contact seat loose defect state (as shown Figure 6c As shown) and 100Hz current voltage coupling (as shown Figure 6d The vibration waveform of GIS equipment under loading (as shown in Figure 2). Figure 6a-6dThe horizontal axis of the upper figure is time, and the vertical axis is vibration amplitude (the output amplitude unit is voltage, V); the horizontal axis of the lower figure is frequency (Hz), and the vertical axis is vibration amplitude (the output amplitude unit is voltage, V). It can be found that the present invention achieves good defect simulation, and there is a large difference between the defect vibration signal and the normal signal. The main vibration frequency of 100Hz voltage and current is twice that of 50Hz voltage and current, which objectively and truly reflects the vibration characteristics of different components under different operating conditions.

[0065] The present invention integrates multiple types of real GIS / GIL equipment and adjustable-size components, and introduces voltage-current coupling loading and harmonic current injection functions, realizing the operation vibration simulation of GIS / GIL equipment with variable sizes and types of components in normal or mechanical defect states. The system can carry out variable-frequency vibration law tests of GIS / GIL equipment and structural modal analysis tests of different components, which can not only provide technical support for the detection of vibration defects of GIS / GIL equipment at different voltage levels on site, but also can be used in relevant scientific research on GIS / GIL equipment in colleges and universities and research institutes, fully simulating the operation vibration mechanism and regular characteristics of GIS / GIL equipment, which has important engineering practical significance.

[0066] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A GIS / GIL equipment mechanical vibration simulation system, characterized by: It includes GIS / GIL equipment mechanical defect simulation unit, frequency sweep injection unit, voltage and current generation unit, multi-channel vibration test and structural modal analysis unit and human-machine interaction control unit; Among them, the GIS / GIL equipment mechanical defect simulation unit includes a main circuit formed by a combination of true gas chambers of the GIS / GIL equipment; The sweep frequency injection unit is used to inject the sweep frequency power supply into the main circuit; the sweep frequency injection unit includes a three-phase power supply, a rectifier, an inverter and a filter connected in series in sequence; the filter is used to output the sweep frequency power supply to the main circuit; the rectifier converts the three-phase power supply into a DC signal and outputs it to the inverter, the inverter converts the DC signal into a PWM AC signal of a corresponding frequency and outputs it to the filter, the filter filters out the high-frequency component of the PWM signal, and obtains a smooth sinusoidal signal of a corresponding frequency to be injected into the main circuit; the frequency of the inverter output signal is continuously controlled by the human-computer interaction and control unit; the human-computer interaction and control unit accesses the output signals of the inverter and the filter for feedback adjustment; The voltage and current generating unit is used to apply voltage load to the main circuit and inject power frequency current; The multi-channel vibration test and structural modal analysis unit is used to collect the status information of GIS / GIL equipment and perform defect identification and modal analysis and feed back the identification and analysis results to the human-computer interaction and control unit; The human-computer interaction and control unit is used to display the identification and analysis results, and generate control instructions based on the identification and analysis results and send them to the GIS / GIL equipment mechanical defect simulation unit, sweep frequency injection unit, and voltage and current generation unit.

2. A GIS / GIL equipment mechanical vibration simulation system according to claim 1, characterized in that: The main circuit includes a circuit breaker gas chamber, an isolating switch gas chamber, an isolating grounding switch gas chamber, a current transformer gas chamber, a voltage transformer gas chamber, a lightning arrester gas chamber, a busbar gas chamber, a high-voltage bushing and various connection structures and transition elements connected in series; each true-type gas chamber is filled with SF6 insulating gas at standard pressure; through exhaustion and structural disassembly of each true-type gas chamber, the internal components of each equipment in the main circuit are set to wear, looseness, fatigue mechanical defects.

3. A GIS / GIL equipment mechanical vibration simulation system according to claim 2, characterized in that: The busbar air chamber includes multiple detachable sliding brackets of different sizes and configured with different numbers; the detachable sliding brackets are used to support the structure of the busbar air chamber; the supporting structure and stress state of the busbar air chamber are adjusted by setting the position and number of the sliding brackets.

4. A GIS / GIL equipment mechanical vibration simulation system according to claim 2, characterized in that: The output end of the filter is connected in parallel to the two ends of the isolating switch air chamber.

5. A GIS / GIL equipment mechanical vibration simulation system according to claim 2, characterized in that: The voltage and current generating unit includes a transformer circuit; the transformer circuit includes a test transformer and a capacitor; the external voltage is boosted by the test transformer and filtered by the capacitor and then injected into the main circuit through the high-voltage bushing air chamber.

6. A GIS / GIL equipment mechanical vibration simulation system according to claim 2, characterized in that: The voltage and current generating unit includes a current boosting circuit, which includes a voltage regulator and a capacitor; the external voltage is electrically connected to the input end of the voltage regulator, and the output current of the voltage regulator flows into the current transformer chamber after filtering by the capacitor, and the injection of the main circuit power frequency high current is realized after the induction current boosting.

7. A GIS / GIL equipment mechanical vibration simulation system according to claim 1, characterized in that: It also includes a grounding protection unit; when the grounding protection unit is connected to the main circuit, the main circuit is in a disconnected state, and each device in the main circuit is grounded through the grounding protection unit.

8. The GIS / GIL equipment mechanical vibration simulation system according to claim 1, characterized in that: The multi-channel vibration test and structural modal analysis unit includes a multi-channel piezoelectric acceleration sensor, an NI high-speed data acquisition unit, and a signal detection identification and SignalPad modal analysis module; the multi-channel piezoelectric acceleration sensor is arranged on the shell of the GIS / GIL equipment and the collected status information of the GIS / GIL equipment is sent to the signal detection identification and SignalPad modal analysis module after pre-processing by the NI high-speed data acquisition unit, and the signal detection identification and SignalPad modal analysis module realizes defect identification and modal analysis functions.

9. A method for simulating mechanical vibration of GIS / GIL equipment, characterized in that: The following steps are involved: a. Disassemble or set up each equipment air chamber and component in the main circuit of the mechanical defect simulation unit of the GIS / GIL equipment according to the experimental requirements, make electrical connections to the main circuit after completion, and arrange the voltage and current generating unit, the sweep frequency injection unit, and the multi-channel vibration test and structural modal analysis unit; select to execute step b or step c according to the experimental requirements; b. Connect the voltage and current generating unit to the main circuit and isolate the frequency sweep injection unit from the main circuit; The voltage and current generating unit applies voltage load and injects power frequency current to the main circuit; c. Connect the frequency sweep injection unit to the main circuit and isolate the voltage and current generating unit from the main circuit; The sweep frequency injection unit injects the sweep frequency power supply into the main circuit; the sweep frequency injection unit includes a three-phase power supply, a rectifier, an inverter and a filter connected in series in sequence; the filter is used to output the sweep frequency power supply to the main circuit; the rectifier converts the three-phase power supply into a DC signal and outputs it to the inverter, the inverter converts the DC signal into a PWM AC signal of a corresponding frequency and outputs it to the filter, the filter filters out the high-frequency component of the PWM signal, and obtains a smooth sinusoidal signal of a corresponding frequency and injects it into the main circuit; the frequency of the inverter output signal is continuously controlled by the human-computer interaction and control unit; the human-computer interaction and control unit accesses the output signals of the inverter and the filter for feedback adjustment; d. The multi-channel vibration test and structural modal analysis unit collects the status information generated by the GIS / GIL device in step b or c, performs defect identification and modal analysis, and feeds back the identification and analysis results to the human-computer interaction and control unit; e. The human-computer interaction and control unit displays the identification and analysis results, and generates control instructions based on the identification and analysis results and sends them to the GIS / GIL equipment mechanical defect simulation unit, sweep frequency injection unit, and voltage and current generation unit.

10. A method for simulating mechanical vibration of GIS / GIL equipment according to claim 9, characterized in that: In step b and step c, before connecting the voltage and current generating unit or the sweep frequency injection unit to the main circuit, ensure that the voltage protection and starting circuit of the main circuit are in the disconnected state, and connect the grounding protection unit; after the main circuit wiring is completed, check whether there is a short circuit or a broken line, and disconnect the grounding protection unit after confirmation.

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