CN114047410A - Mechanical vibration simulation system and method for GIS/GIL equipment - Google Patents
Mechanical vibration simulation system and method for GIS/GIL equipment Download PDFInfo
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- G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
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- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention provides a GIS/GIL equipment mechanical vibration simulation system and a method thereof, wherein the GIS/GIL equipment mechanical vibration simulation system comprises 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 structure mode analysis unit and a man-machine interaction control unit; the GIS/GIL equipment mechanical defect simulation unit comprises a main loop formed by combining true air chambers of the GIS/GIL equipment; the sweep frequency injection unit is used for injecting a sweep frequency power supply into the main loop; the voltage and current generating unit is used for applying voltage load to the main loop and injecting power frequency current; the multi-channel vibration testing and structural modal analysis unit is used for acquiring the state information of the GIS/GIL equipment, identifying defects, carrying out modal analysis and feeding back an identification analysis result to the human-computer interaction and control unit; the human-computer interaction and control unit is used for displaying the identification and analysis result. The invention provides technical support for effectively detecting the mechanical vibration defect of the GIS/GIL equipment.
Description
Technical Field
The invention belongs to the technical field of electrician detection, and particularly relates to a mechanical vibration simulation system and method for GIS/GIL equipment.
Background
Gas insulated metal enclosed switchgear (GIS) and Gas insulated transmission lines (GIL) have the characteristics of reliability, safety, convenience in maintenance, space integration and the like. According to the introduction of the national power grid 'high-voltage switchgear typical fault case list assembly', mechanical and insulation defects are main reasons for generating power accidents of GIS/GIL equipment, long-term mechanical vibration defects can cause damages such as gas leakage, loop temperature rise and insulation aging damage, and even lead to accidents such as conductor short circuit and insulation breakdown. The detection and identification of the mechanical vibration defect of the GIS/GIL equipment are always key technical problems in the operation and maintenance process of the GIS/GIL equipment. Therefore, the GIS/GIL equipment mechanical vibration characteristic simulation is carried out, the GIS/GIL equipment mechanical vibration state change rule is mastered, and the GIS/GIL equipment mechanical vibration characteristic simulation method is an important measure for effectively detecting the GIS/GIL equipment mechanical vibration defect and guaranteeing the safe and stable operation of the GIS/GIL equipment mechanical vibration defect.
The traditional GIS/GIL equipment vibration characteristic simulation and research is based on a scaling model of a single air chamber.
The utility model discloses a GIS equipment vibration characteristic simulation detection device provides a vibration characteristic simulation and detection device based on GIS equipment generating line cavity, but can only simulate transient state vibration signal, can not simulate the actual operating condition under the voltage current effect. The invention provides a vibration simulation platform and a device for simulating GIS equipment under an operating condition by adjusting the thickness and the length of a connecting rod, but the vibration simulation platform and the device are only concentrated in a bus air chamber. The invention provides a GIS equipment defect simulation analysis device and method, and provides an operation vibration simulation system integrating a GIS equipment simulation device, a vibration and partial discharge sensor, a voltage source and a data acquisition card, but the gas chamber has single function and can only realize voltage loading. Summarizing, the vibration simulation system of the bus still has the following defects, which mainly have two aspects:
on one hand, GIS/GIL equipment has numerous internal components, including circuit breakers, isolating switches, grounding switches, current transformers, voltage transformers (namely current booster air chambers), lightning arresters, buses, connecting pipes, transition elements and the like, and the defect forms, the geometrical structures and the constraint states of different components are different greatly. And GIS/GIL equipment size structure changes diversely, and especially long distance transmission corridor engineering, bus structure often carries out different size design according to the environmental requirement, or adopts different support mode, and its vibration characteristic also has the difference. On the other hand, a power system has a large number of nonlinear elements, and meanwhile, a large number of power electronic devices are connected to a user side, and a power grid has certain harmonic current components. Harmonic current can not only increase equipment loss, shorten equipment service life, cause switch misoperation and the like, but also cause the change of the vibration phenomenon of the equipment, particularly when the frequency of electromagnetic force generated by system harmonic current is close to or equal to the modal frequency of an internal component of an air chamber, the GIS/GIL equipment can generate strong mechanical resonance, so that the insulation or mechanical performance of the equipment is damaged, and the vibration simulation system and the vibration characteristic of the GIS/GIL equipment under the action of the harmonic current are not reported yet.
Disclosure of Invention
The invention aims to solve the defects of the prior art, provides a GIS/GIL equipment mechanical vibration simulation system and a method thereof, and provides technical support for effectively detecting the mechanical vibration defects of the GIS/GIL equipment.
The technical scheme adopted by the invention is as follows: a mechanical vibration simulation system of GIS/GIL equipment comprises 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 structure mode analysis unit and a man-machine interaction control unit;
the GIS/GIL equipment mechanical defect simulation unit comprises a main loop formed by combining vacuum air chambers of the GIS/GIL equipment;
the sweep frequency injection unit is used for injecting a sweep frequency power supply into the main loop;
the voltage and current generating unit is used for applying voltage load to the main loop and injecting power frequency current;
the multi-channel vibration testing and structural modal analysis unit is used for acquiring the state information of the GIS/GIL equipment, identifying defects, carrying out modal analysis and feeding back an identification analysis result to the human-computer interaction and control unit;
and the human-computer interaction and control unit is used for displaying the identification and analysis result, generating a control command based on the identification and analysis result and sending the control command to the GIS/GIL equipment mechanical defect simulation unit, the sweep frequency injection unit and the voltage and current generation unit.
In the technical scheme, the main circuit comprises a breaker air chamber, an isolating switch air chamber, an isolating grounding switch air chamber, a current transformer air chamber, a voltage transformer air chamber, a lightning arrester air chamber, a bus air chamber, a high-voltage bushing, various connecting structures and transition elements which are mutually connected in series; the interior of each vacuum type gas chamber is filled with standard-pressure SF6 insulating gas; the internal components of each device in the main loop are provided with mechanical defects of abrasion, looseness and fatigue through air extraction and structural disassembly of each vacuum air chamber.
In the technical scheme, the bus air chamber comprises a plurality of detachable sliding supports with different sizes and different numbers; the detachable sliding support is used for supporting the structure of the bus air chamber; the bus air chamber supporting structure and the stress state are adjusted by setting the position and the number of the sliding supports.
In the technical scheme, the sweep frequency injection unit comprises a three-phase power supply, a rectifier, an inverter and a filter which are sequentially connected in series; the output end of the filter is connected in parallel with two ends of the isolating switch air chamber and used for outputting a sweep frequency power supply to the main loop; the rectifier converts a three-phase power supply into a direct current signal and outputs the direct current signal to the inverter, the inverter converts the direct current signal into a PWM alternating current signal with corresponding frequency and outputs the PWM alternating current signal to the filter, and the filter filters high-frequency components of the PWM signal to obtain a smooth sinusoidal signal with corresponding frequency and injects the smooth sinusoidal signal into the main loop; the frequency of the output signal of the inverter is continuously controlled by a human-computer interaction and control unit; the human-computer interaction and control unit is connected to the output signals of the inverter and the filter for feedback adjustment.
In the above technical solution, the voltage current generating unit includes a transformer loop; the transformer loop comprises a test transformer and a capacitor; the external voltage is boosted by the test transformer and filtered by the capacitor and then is injected into the main loop through the high-voltage bushing air chamber.
In the above technical solution, the voltage current generating unit includes a current rising loop, and the current rising loop includes a voltage regulator and a capacitor; the external voltage is electrically connected with the input end of the voltage regulator, the output current of the voltage regulator flows into the air chamber of the current transformer after being filtered by the capacitor, and the injection of the main loop power frequency large current is realized after the current is boosted by induction. .
In the above technical solution, the device further comprises a ground protection unit; when the grounding protection unit is connected into the main loop, the main loop is in a disconnected state, and each device in the main loop is grounded through the grounding protection unit.
In the technical scheme, the multi-channel vibration testing and structural modal analysis unit comprises 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 a shell of the GIS/GIL equipment, collected state information of the GIS/GIL equipment is preprocessed by the NI high-speed data collection unit and then sent to the signal detection identification and SignalPad modal analysis module, and the signal detection identification and SignalPad modal analysis module achieves defect identification and modal analysis functions.
The invention provides a mechanical vibration simulation method of GIS/GIL equipment, which comprises the following steps:
a, disassembling or setting each equipment air chamber and component in a main loop of a GIS/GIL equipment mechanical defect simulation unit according to experimental requirements, electrically connecting the main loop after the disassembly or the setting, and arranging a voltage current generation unit, a sweep frequency injection unit and a multi-channel vibration test and structural mode analysis unit; selecting to execute the step b or the step c according to experiment requirements;
b, connecting the voltage and current generating unit to a main loop, and isolating the sweep frequency injection unit from the main loop; the voltage and current generating unit applies voltage load and injects power frequency current to the main loop;
c, connecting the sweep frequency injection unit to a main loop, and isolating the voltage and current generation unit from the main loop; the voltage and current generation unit injects a sweep frequency power supply into the main loop;
d, the multi-channel vibration testing and structural modal analysis unit collects the state information generated by the GIS/GIL equipment in the step b or c, performs defect identification and modal analysis and feeds back the identification and analysis result to the human-computer interaction and control unit;
and e, the man-machine interaction and control unit displays the identification and analysis result, generates a control command based on the identification and analysis result and sends the control command to the GIS/GIL equipment mechanical defect simulation unit, the sweep frequency injection unit and the voltage and current generation unit.
In the above technical solution, in the steps b and c, before the voltage and current generating unit or the sweep frequency injection unit is connected to the main circuit, the voltage protection and start-up circuit of the main circuit is ensured to be in a disconnected state, and the ground protection unit is connected; and after the main loop is wired, whether short circuit and disconnection conditions exist is checked, and the grounding protection unit is disconnected after the situation is confirmed to be correct.
The invention has the beneficial effects that: the invention can realize the running vibration simulation of GIS/GIL equipment under the condition of normal or existing mechanical defects of variable-size and variant components, the frequency conversion vibration rule test of the GIS/GIL equipment under the conditions of harmonic current injection and variable load and the structural mode analysis test of different components of the GIS/GIL equipment, and has greater scientific research and use value and practical engineering significance. Compared with the existing GIS/GIL equipment simulation platform, the invention integrates various types of components of 500kV true GIS/GIL equipment, simultaneously designs bus air chambers with different sizes in a main loop, and is provided with a plurality of detachable sliding supports, thereby realizing the operation vibration simulation of buses with different lengths and different types of components under the normal or mechanical defect state. The invention introduces a harmonic generator and a high-voltage heavy-current generator, designs a harmonic injection interface in a mechanical defect simulation unit of the GIS/GIL equipment, and realizes the frequency conversion vibration rule test of the GIS/GIL equipment under the conditions of harmonic injection and variable load. The invention is provided with a multi-channel vibration test and structural modal analysis device, thereby realizing the structural modal analysis test of different components of the GIS/GIL equipment.
Drawings
FIG. 1 is a wiring diagram of a GIS/GIL device operation condition working condition vibration simulation loop of the present invention;
FIG. 2 is a wiring diagram of a GIS/GIL device frequency conversion excitation condition vibration simulation loop of the present invention;
FIG. 3 is a distribution diagram of a GIS/GIL equipment mechanical defect simulation unit gas chamber of the present invention;
the figure includes: the air chamber of the circuit breaker (CB1), the air chambers of the disconnecting switches (DS1, DS2), the air chambers of the disconnecting grounding switches (DS1-ES1), the air chambers of the grounding switches (ES2), the air chambers of the current transformers (CT1, namely the air chambers of the current boosters), the air chambers of the voltage transformers (PT1), the air chambers of the Lightning Arresters (LA), the buses (Line 1-Line 6), the tee joints (TV1, TV2, TV3, TV4), the 1-test transformer, the 2-voltage regulator, the 3-capacitor and the 4-telescopic joint.
FIG. 4 is a structural diagram of a frequency-sweeping power supply apparatus according to the present invention;
FIG. 5 is a schematic diagram of a swept frequency power supply circuit of the present invention;
FIGS. 6a-6d are graphs of vibration waveforms of the mechanical defect simulation platform of the GIS/GIL device under different working conditions.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in FIGS. 1-3, the device mainly comprises 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 mode analysis unit, a grounding protection unit and a man-machine interaction control unit.
The GIS/GIL equipment mechanical defect simulation unit comprises a main loop formed by combining vacuum air chambers of the GIS/GIL equipment;
the sweep frequency injection unit is used for injecting a sweep frequency power supply into the main loop;
the voltage and current generating unit is used for applying voltage load to the main loop and injecting power frequency current;
the multi-channel vibration testing and structural modal analysis unit is used for acquiring the state information of the GIS/GIL equipment, identifying defects, carrying out modal analysis and feeding back an identification analysis result to the human-computer interaction and control unit;
the human-computer interaction and control unit is used for displaying the identification and analysis result, generating a control command based on the identification and analysis result and sending the control command to the GIS/GIL equipment mechanical defect simulation unit, the sweep frequency injection unit and the voltage and current generation unit;
the grounding protection unit is used for protecting the safety of the main loop, the main loop is in a disconnected state when the main loop is connected, and each device in the main loop is grounded through the grounding protection unit.
The system structure and the loop circuit diagram are shown in fig. 1 and 2. The loop mainly comprises a GIS/GIL equipment vibration simulation main loop and peripheral equipment. The main circuit comprises a breaker air chamber (CB1), an isolation grounding switch air chamber (DS1-ES1), a grounding switch (ES2), a current transformer (CT1, namely a current booster air chamber), a voltage transformer air chamber (PT1), a lightning arrester air chamber (LA), a bus air chamber (Line 1-Line 6) and a high-voltage bushing BSG. The peripheral equipment comprises a sweep frequency power supply generating device (namely a sweep frequency injection unit), a transformer, a large current generating device (namely a voltage current generating unit) and the like.
The main loop comprises bus air chambers Line 1-Line 6, a breaker air chamber CB1, a disconnecting switch air chamber DS1, a current transformer air chamber CT1 (namely a current booster air chamber), a high-voltage bushing BSG and isolating grounding switch air chambers DS1-ES1 which are connected in series, and the main loop is electrically connected with a voltage transformer PT1 and a lightning arrester LA which are connected in series and are grounded through the disconnecting switch air chamber DS 2. The sweep frequency power supply (namely the sweep frequency access unit) is connected in parallel with two ends of the gas chamber DS1 of the isolating switch through a switch S1. The transformer loop in the voltage and current generating unit comprises a test transformer, a capacitor and a high-voltage bushing. The test transformer is connected to the main circuit through a switch S2 and a capacitor through a high-voltage bushing BSG. As shown by the arrows in the figure, the test transformer applies a voltage to the main circuit through the high-voltage bushing BSG. The current rising loop in the voltage and current generation unit comprises a voltage regulator, a capacitor and a current rising device. The external voltage is regulated by the voltage regulator and then is connected to the current booster (i.e. the inductive current booster shown in the figure), and 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 is injected into the main loop through the current transformer air chamber CT 1. The isolation grounding switches DS1-ES1 are single-pole double-throw switches, and the isolation grounding switches DS1-ES1 realize the switching of a main loop closed state and an open and grounding state.
The distribution diagram of loop air chambers formed by the GIS/GIL equipment mechanical defect simulation units is shown in figure 3, wherein the main loop comprises a breaker air chamber, a disconnecting switch air chamber, a disconnecting grounding switch air chamber, a current transformer air chamber, a voltage transformer air chamber, a lightning arrester air chamber, a bus, a sleeve, various connecting structures and transition elements (comprising a tee joint, a base, a telescopic joint, an insulator and the like), and the main loop is combined and designed by adopting a true air chamber of 500kV GIS/GIL equipment. The gas chamber of each device of the GIS/GIL device mechanical defect simulation unit is filled with standard-pressure SF6 insulating gas, and mechanical defects such as abrasion, looseness, fatigue and the like can be set on internal components through air extraction and structural disassembly. And the GIS/GIL equipment, the frequency sweeping power supply generating device, the transformer and the large current generating device are uniformly grounded. The built-in ground protection unit of the system realizes the self-cut-off protection function for breakdown, short circuit, misoperation and other working conditions.
As shown in fig. 3, two three-way TV1 and TV2 on the left side of the main loop are respectively provided with an input port and an output port for accessing the sweep frequency power generation device. A current booster air chamber is connected between two tee joints TV3 and TV4 on the left side of the main loop, and a voltage divider (namely a test transformer) access port is arranged on the lower right-hand tee joint TV4 through a high-voltage bushing. The air chamber of the current booster is provided with a current access port and is externally connected with a voltage regulator. The loop bus adopts a multi-scale structure, the bus air chambers respectively correspond to the main loops Line 1-Line 6, and the lengths of the bus air chambers are 2m, 3m, 4m, 5m and 6m respectively. The long interval Line5 and the Line6 are provided with different numbers of detachable sliding supports, so that the bus air chamber is structurally supported. The position and the number of the sliding supports can be adjusted according to actual requirements, so that the bus air chamber supporting structure and the stress state can be adjusted.
The swept frequency current injection unit generates a swept frequency power supply, and the device structure and the circuit principle thereof are shown in fig. 4 and 5. The device mainly comprises four components of a rectifier, an inverter, a filter and a controller. The rectifier converts a three-phase power supply into a direct current signal through a bridge rectifier circuit consisting of diodes VT 1-VT 6, then converts the direct current signal into a PWM alternating current signal with corresponding frequency through a thyristor V1-V4 inverter circuit, and finally filters out high-frequency components of the PWM signal by using a filter circuit to obtain a smooth sinusoidal signal with corresponding frequency and injects the smooth sinusoidal signal into a main loop. The frequency of the output signal of the inverter is continuously controlled by the human-computer interaction and control unit and is connected with the output signals of the inverter and the filter for feedback adjustment. The frequency sweeping power supply can provide a frequency-variable alternating current output signal of 0-5000A, and the output frequency can be continuously controlled within the range of 0-2000 Hz.
The voltage and current generating unit consists of a transformer loop and a current rising loop, the transformer loop comprises a test transformer, a capacitor and a sleeve, external voltage is boosted by the test transformer and filtered by the capacitor and then is injected into the main loop through a high-voltage sleeve, and a voltage load in the range of 0-500 kV can be applied. The current rising loop comprises a voltage regulator, a capacitor and a current rising device air chamber (namely a current transformer air chamber in the main loop), the three and the main loop form an induction current rising loop, and power frequency current in the range of 0-5000A can be injected.
The multi-channel vibration testing and structural modal analysis unit comprises a multi-channel piezoelectric acceleration sensor (fixed on the equipment shell), an NI high-speed data acquisition unit and signal detection identification and SignalPad modal analysis software, and realizes the functions of dynamic data acquisition, AD conversion, defect identification and modal analysis of vibration signals.
The man-machine interaction and control unit is used for realizing the functions of main loop switching control, voltage and current lifting control of the voltage and current generation unit, external vibration excitation control of the sweep frequency access unit, and vibration waveform and analysis result display. The human-computer interaction and control unit keeps a certain safe distance from the main loop, and remote control and display of the vibration test are achieved.
The working process of the specific embodiment is as follows:
the first step is as follows: setting of mechanical defects and adjustment of support structure of GIS/GIL equipment
The GIS/GIL equipment operation condition vibration can be divided into a normal state and a defect state, under the defect state, a system main loop can be disassembled aiming at different air chambers and components, single or coupling arrangement of the defect states such as bolt looseness, poor contact, switch jamming, spring fracture, component abrasion and the like can be carried out according to needs, and voltage and current loading and vibration detection can be carried out after the structure is restored.
Specifically, the GIL bus air chambers can be set to be in single-end, two-end or multi-end and other multi-type supporting constraint modes by disassembling and moving the sliding supporting structures B1-B5 of the GIL bus air chambers Line5 and Line6 according to experimental requirements. The vibration detection sensors (i.e. the multi-channel piezoelectric acceleration sensor) are arranged and installed according to requirements and sampling points.
The second step is that: access and return connection checking of exciter
(1) And (3) simulating the working condition vibration of the GIS/GIL equipment under the operation condition:
the GIS/GIL equipment operation condition vibration simulation is the generation simulation of equipment vibration under the action of power frequency voltage and current, a transformer loop and an induction current rising device are connected, and a sweep frequency power supply device is isolated from a main loop. The voltage and the current at the transmission part of the transformer loop and the induction current rising device are set through the man-machine interaction and control unit, and a simulation experiment is carried out after wiring and setting are completed. The main loop is connected as shown in fig. 1, wherein the switch S1 is open, the switches S2, S3 and the isolating switch DS2 are closed, the isolating grounding switch DS1-ES1 are connected to the main loop, and the transformer loop and the inductive current rising device can be loaded singly or in a coupling mode according to experimental requirements. Before the main circuit is connected, whether the voltage protection and the starting circuit are disconnected or not is guaranteed, the grounding protection is started, whether short circuit and disconnection conditions exist or not is checked after the connection is finished, and the grounding electrode (namely the grounding protection unit) is taken down after the situation that no fault exists is confirmed.
(2) Vibration simulation of the GIS/GIL equipment under the variable-frequency excitation condition:
under the vibration simulation condition of the variable frequency excitation condition GIS/GIL equipment, the sweep frequency power supply device is connected into the main loop, and the transformer and the induction current rising device are isolated from the main loop. The output voltage of the frequency sweeping power supply is set through the man-machine interaction and control unit, and a simulation experiment is carried out after wiring and setting are completed. The main circuit is connected as shown in fig. 2, wherein the switch S1 is closed, the switches S2, S3 and the disconnecting switch DS2 are all opened, and the disconnecting grounding switch DS1-ES1 is connected to the main circuit. Under the frequency conversion excitation of the GIS/GIL equipment, the sweep frequency power supply can apply a single-frequency steady-state sinusoidal signal, a slow sweep frequency steady-state sinusoidal signal, a fast sweep frequency sinusoidal signal and a sweep frequency sinusoidal burst signal to the main loop, so that the research on the integral frequency conversion vibration of the internal components of the main loop is realized. Before the main circuit is connected, whether the voltage protection and the starting circuit are disconnected or not is guaranteed, the grounding protection is started, whether short circuit and disconnection conditions exist or not is checked after the connection is finished, and the grounding electrode (namely the grounding protection unit) is taken down after the situation that no fault exists is confirmed.
The third step: vibration detection and signal analysis
A sensor detection network formed by the multi-channel piezoelectric acceleration sensors and a multi-channel vibration test acquisition unit are used for carrying out dynamic acquisition on vibration signals, and the sampling rate and the sampling time are set through a man-machine interaction and control unit according to actual requirements, so that signal spectrum analysis and identification of structural integral modal parameters are further realized. And the human-computer interaction and control unit displays the generated identification and analysis result.
After the GIS/GIL equipment operation condition vibration simulation is detected, the input voltage U of the induction current rising device is sensedi2Dropping to 0, the main loop current drops to zero and the loop voltage is cut off, i.e., switches S2 and S3 are opened.
And after the vibration simulation of the GIS/GIL equipment under the variable-frequency excitation condition is detected, the switch S1 is switched off.
The specific embodiment provides a test example of a defect testing platform. Fig. 6a-6d are vibration waveforms of the GIS device under the conditions that the simulation platform is loaded with only 50Hz current (as shown in fig. 6 a), the 50Hz current and voltage coupling loading is normal (as shown in fig. 6 b), the guide rod contact seat loosening defect state (as shown in fig. 6 c) and the 100Hz current and voltage coupling (as shown in fig. 6 d), respectively. Wherein, the abscissa of the upper graph in fig. 6a-6d is time, and the ordinate is vibration amplitude (output amplitude unit is voltage, V); the lower graph has frequency (Hz) on the abscissa and vibration amplitude (output amplitude in voltage, V) on the ordinate. The defect simulation method realizes good defect simulation, the defect vibration signal and the normal signal have larger difference, the vibration main frequency of 100Hz voltage and current is 2 times of the vibration main frequency of 50Hz voltage and current, and the vibration characteristics of different components under different operating conditions are objectively and truly reflected.
The invention integrates the multi-type true GIS/GIL equipment and the size-adjustable component, simultaneously introduces the functions of voltage-current coupling loading and harmonic current injection, and realizes the operation vibration simulation of the GIS/GIL equipment under the state that the size-variable and variety components are normal or have mechanical defects. The system can carry out frequency conversion vibration rule testing of the GIS/GIL equipment and structural modal analysis testing of different components, not only can provide technical support for detecting vibration defects of the GIS/GIL equipment at different voltage levels on site, but also can be used for relevant scientific research of colleges and universities and scientific research institutes on the GIS/GIL equipment, fully simulates the operation vibration mechanism and rule characteristics of the GIS/GIL equipment, and has important engineering practical significance.
Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A mechanical vibration simulation system of GIS/GIL equipment is characterized in that: the system comprises 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 man-machine interaction control unit;
the GIS/GIL equipment mechanical defect simulation unit comprises a main loop formed by combining vacuum air chambers of the GIS/GIL equipment;
the sweep frequency injection unit is used for injecting a sweep frequency power supply into the main loop;
the voltage and current generating unit is used for applying voltage load to the main loop and injecting power frequency current;
the multi-channel vibration testing and structural modal analysis unit is used for acquiring the state information of the GIS/GIL equipment, identifying defects, carrying out modal analysis and feeding back an identification analysis result to the human-computer interaction and control unit;
and the human-computer interaction and control unit is used for displaying the identification and analysis result, generating a control command based on the identification and analysis result and sending the control command to the GIS/GIL equipment mechanical defect simulation unit, the sweep frequency injection unit and the voltage and current generation unit.
2. The mechanical vibration simulation system of a GIS/GIL device of claim 1, wherein: the main circuit comprises a breaker air chamber, an isolating switch air chamber, an isolating grounding switch air chamber, a current transformer air chamber, a voltage transformer air chamber, a lightning arrester air chamber, a bus air chamber, a high-voltage sleeve, various connecting structures and transition elements which are connected in series; the interior of each vacuum type gas chamber is filled with standard-pressure SF6 insulating gas; the internal components of each device in the main loop are provided with mechanical defects of abrasion, looseness and fatigue through air extraction and structural disassembly of each vacuum air chamber.
3. The mechanical vibration simulation system of a GIS/GIL device of claim 2, wherein: the bus air chamber comprises a plurality of detachable sliding supports with different sizes and different numbers; the detachable sliding support is used for supporting the structure of the bus air chamber; the bus air chamber supporting structure and the stress state are adjusted by setting the position and the number of the sliding supports.
4. The mechanical vibration simulation system of a GIS/GIL device of claim 2, wherein: the sweep frequency injection unit comprises a three-phase power supply, a rectifier, an inverter and a filter which are sequentially connected in series; the output end of the filter is connected in parallel with two ends of the isolating switch air chamber and used for outputting a sweep frequency power supply to the main loop; the rectifier converts a three-phase power supply into a direct current signal and outputs the direct current signal to the inverter, the inverter converts the direct current signal into a PWM alternating current signal with corresponding frequency and outputs the PWM alternating current signal to the filter, and the filter filters high-frequency components of the PWM signal to obtain a smooth sinusoidal signal with corresponding frequency and injects the smooth sinusoidal signal into the main loop; the frequency of the output signal of the inverter is continuously controlled by a human-computer interaction and control unit; the human-computer interaction and control unit is connected to the output signals of the inverter and the filter for feedback adjustment.
5. The mechanical vibration simulation system of a GIS/GIL device of claim 2, wherein: the voltage and current generating unit comprises a transformer loop; the transformer loop comprises a test transformer and a capacitor; the external voltage is boosted by the test transformer and filtered by the capacitor and then is injected into the main loop through the high-voltage bushing air chamber.
6. The mechanical vibration simulation system of a GIS/GIL device of claim 2, wherein: the voltage and current generating unit comprises a current rising loop, and the current rising loop comprises a voltage regulator and a capacitor; the external voltage is electrically connected with the input end of the voltage regulator, the output current of the voltage regulator flows into the air chamber of the current transformer after being filtered by the capacitor, and the injection of the main loop power frequency large current is realized after the current is boosted by induction.
7. The mechanical vibration simulation system of a GIS/GIL device of claim 1, wherein: the grounding protection unit is also included; when the grounding protection unit is connected into the main loop, the main loop is in a disconnected state, and each device in the main loop is grounded through the grounding protection unit.
8. The mechanical vibration simulation system of a GIS/GIL device of claim 1, wherein: the multi-channel vibration testing and structural modal analysis unit comprises 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 a shell of the GIS/GIL equipment, collected state information of the GIS/GIL equipment is preprocessed by the NI high-speed data collection unit and then sent to the signal detection identification and SignalPad modal analysis module, and the signal detection identification and SignalPad modal analysis module achieves defect identification and modal analysis functions.
9. A mechanical vibration simulation method of GIS/GIL equipment is characterized by comprising the following steps: the method comprises the following steps:
a, disassembling or setting each equipment air chamber and component in a main loop of a GIS/GIL equipment mechanical defect simulation unit according to experimental requirements, electrically connecting the main loop after the disassembly or the setting, and arranging a voltage current generation unit, a sweep frequency injection unit and a multi-channel vibration test and structural mode analysis unit; selecting to execute the step b or the step c according to experiment requirements;
b, connecting the voltage and current generating unit to a main loop, and isolating the sweep frequency injection unit from the main loop; the voltage and current generating unit applies voltage load and injects power frequency current to the main loop;
c, connecting the sweep frequency injection unit to a main loop, and isolating the voltage and current generation unit from the main loop; the voltage and current generation unit injects a sweep frequency power supply into the main loop;
d, the multi-channel vibration testing and structural modal analysis unit collects the state information generated by the GIS/GIL equipment in the step b or c, performs defect identification and modal analysis and feeds back the identification and analysis result to the human-computer interaction and control unit;
and e, the man-machine interaction and control unit displays the identification and analysis result, generates a control command based on the identification and analysis result and sends the control command to the GIS/GIL equipment mechanical defect simulation unit, the sweep frequency injection unit and the voltage and current generation unit.
10. The method of claim 9 for simulating mechanical vibration of a GIS/GIL device, wherein: in the steps b and c, before the voltage and current generating unit or the sweep frequency injection unit is connected to the main circuit, the voltage protection and the starting circuit of the main circuit are ensured to be in a disconnection state, and the grounding protection unit is connected; and after the main loop is wired, whether short circuit and disconnection conditions exist is checked, and the grounding protection unit is disconnected after the situation is confirmed to be correct.
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