CN111812459A - Simulation test system applied to switch cabinet partial discharge live detection - Google Patents
Simulation test system applied to switch cabinet partial discharge live detection Download PDFInfo
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- G01R31/12—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
- 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
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Abstract
The invention relates to a simulation test system applied to switch cabinet partial discharge live detection, which comprises at least two switch cabinet models, wherein the switch cabinet models are arranged in an array; the high-voltage buses sequentially penetrate through the switch cabinet models in the same row; the two ends of the cabinet penetrating sleeve are respectively fixed with two adjacent switch cabinet models in the same row so as to allow the high-voltage bus to penetrate through; the power supply device is connected with the high-voltage bus and is used for applying preset voltage to the high-voltage bus; the defect model is arranged in one or more switch cabinet models and is connected with the high-voltage bus, and the defect model is used for generating a partial discharge signal; and the monitoring device is used for monitoring the partial discharge signal of the switch cabinet model. The simulation test system truly simulates the environment of the discharge live detection of the field switch cabinet, so that the detection experience summarized in the experiment can be more effectively applied to the field detection.
Description
Technical Field
The invention relates to the technical field of electric power testing, in particular to a simulation test system applied to partial discharge live detection of a switch cabinet.
Background
According to the actual operation experience and theoretical research of a power grid, potential hidden dangers in a switch cabinet can be effectively found through partial discharge live detection, and tripping caused by equipment insulation degradation is avoided. Therefore, the simulation experiment of the local discharge live detection of the switch cabinet is carried out in a laboratory, and great help is provided for researching a detection method, a positioning method and a defect identification method of the local discharge.
At present, most of simulation experiments carried out in laboratories are based on single-sided switch cabinets. The method needs simple equipment and occupies a small test field. However, the simulation experiment mode using the single-sided switch cabinet has a large difference from the arrangement mode and the internal structure of the field switch cabinet, and cannot truly simulate the field test environment, so that the experience and the method summarized in the experiment have poor field application effect.
Disclosure of Invention
Therefore, it is necessary to provide a partial discharge live detection simulation test system applied to a switch cabinet to truly simulate a field test environment, aiming at the problem that a simulation test based on a single-sided cabinet cannot truly model a field environment.
A simulation test system applied to switch cabinet partial discharge live detection, the system comprises:
the switch cabinet models are at least two and are arranged in an array;
the high-voltage bus sequentially penetrates through the switch cabinet models in the same row;
two ends of the cabinet penetrating sleeve are respectively fixed with two adjacent switch cabinet models in the same row so as to allow the high-voltage bus to penetrate through the cabinet penetrating sleeve;
the power supply device is connected with the high-voltage bus and used for applying preset voltage to the high-voltage bus;
the defect model is arranged in one or more switch cabinet models, is connected with the high-voltage bus and is used for generating a partial discharge signal; and
and the monitoring device is used for monitoring the partial discharge signal of the switch cabinet model.
Above-mentioned be applied to simulation test system of cubical switchboard partial discharge live detection, the quantity of cubical switchboard model is two at least and be the array and arrange, adopts multiaspect cubical switchboard model to carry out the partial discharge experiment promptly, compares in the test environment that the simulation experiment mode that adopts single face cubical switchboard model can be more real simulation scene to make experience and method according to the experimental result summary be applicable to the field test more.
In one embodiment, the switch cabinet models are arranged in a row, and the high-voltage bus bar passes through all the switch cabinet models in sequence.
In one embodiment, each of the switch cabinet models is scaled down in accordance with the actual switch cabinet size.
In one embodiment, a detachable partition plate is arranged inside the switch cabinet model and is used for dividing the inside of the switch cabinet model into a plurality of function chambers; the defect model is arranged in one or more functional chambers.
In one embodiment, the functional rooms comprise a simulated busbar and instrument room, a simulated handcart room and a simulated cable room.
In one embodiment, the high-voltage bus and an actual high-voltage bus are made of the same material, or the high-voltage bus and the actual high-voltage bus are of the same type.
In one embodiment, the through cabinet sleeve comprises an epoxy resin layer positioned on an inner layer and a ceramic layer covering the epoxy resin layer, and a containing space for the high-power bus to pass through is formed inside the epoxy resin layer.
In one embodiment, the monitoring device comprises:
the sensors are the same in number and correspond to the switch cabinet models one by one, and the sensors are used for acquiring corresponding partial discharge signals of the switch cabinet models;
and the monitoring module is connected with the sensor and used for receiving and outputting the partial discharge signal.
In one embodiment, the monitoring module outputs a partial discharge signal of the switch cabinet model, and the monitoring module outputs the amplitude of the partial discharge signal and the time of receiving the partial discharge signal.
In one embodiment, the power supply device includes: the transformer is used for adjusting the size of the alternating voltage output to the high-voltage bus so that the alternating voltage output to the high-voltage bus is equal to the preset voltage.
Drawings
Fig. 1 is a schematic structural diagram of a simulation test system applied to partial discharge live detection of a switch cabinet in an embodiment.
Fig. 2 is a partially enlarged perspective view of the area a in fig. 1.
Fig. 3 is a left side view of the switchgear cabinet penetration bushing, the high voltage bus bar, and the switchgear cabinet model after installation in an embodiment.
Fig. 4 is a perspective view of a model of a switchgear in an embodiment.
Reference is made to the accompanying drawings in which: 110. a switch cabinet model; 111. a partition plate; 112. simulating a busbar and an instrument room; 113. simulating a handcart room; 114. a simulated cable chamber; 120. a high voltage bus; 130. a cabinet bushing is penetrated; 131. a ceramic layer; 132. an epoxy resin layer; 140. a power supply device; 150. a defect model; 160. and a monitoring device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present application, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" and "outer" etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. Further, when an element is referred to as being "formed on" another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.
The switch cabinets are common equipment used for executing electric energy distribution and line protection in the power industry, in actual conditions, the switch cabinets are generally placed side by side, and system buses are respectively connected with electrical equipment in each cabinet. Once the switch cabinet is put into operation, the switch cabinet works in an adult day by month, various conductors inside the switch cabinet generate heat due to flowing of current, equipment aging inevitably occurs after a long time, particularly the aging of an insulating part in the equipment, and if the aging cannot be found in time, partial discharge can occur. The partial discharge is a discharge that occurs between the electrodes but does not penetrate the electrodes, and is a phenomenon in which repeated breakdown and extinction occur under the effect of high electric field strength due to a weak point inside the insulation of the device or a defect caused during the production process. Partial discharge is a significant cause of insulation failure of power transformation equipment. Therefore, it is necessary to periodically check for partial discharge and to find potential hidden dangers in time, so as to avoid circuit faults caused by insulation degradation of equipment, thereby ensuring reliable operation of the power system.
However, in actual power generation, the partial discharge phenomenon has randomness and uncontrollable property, which brings difficulty to study the detection of the partial discharge and also hinders the progress of other related studies, such as the determination of the position of the partial discharge, the optimal arrangement of the sensors, and the like. Therefore, it is necessary to design a simulation test system (hereinafter referred to as a simulation test system) for detecting the local discharge of the switch cabinet in a live manner, which can simulate the local discharge detection environment of the field switch cabinet more truly, so that the experience and method summarized according to the local discharge signal of the switch cabinet obtained by the test system are more suitable for the field detection.
Fig. 1 is a schematic structural diagram of a simulation test system in an embodiment. As shown in fig. 1, the testing system includes a switch cabinet model 110, a high voltage bus 120, a cabinet bushing 130, a power supply device 140, a defect model 150, and a monitoring device 160.
The switchgear model 110 may be designed according to the actual switchgear in the field. The size of the switchgear model 110 is scaled up or down according to the size of the field switchgear, and the internal structure of the switchgear model 110 is designed with reference to the internal structure of the field switchgear. The material of the cabinet body can be selected according to actual requirements, for example, a cold-rolled steel plate is adopted as the material of the cabinet body, and the thickness is selected to be 3 mm. In this embodiment, the number of the switch cabinet models 110 is at least two and the switch cabinet models are arranged in an array.
The two ends of the through-cabinet sleeve 130 are respectively fixed with two adjacent switch cabinet models 110 in the same row so as to pass through the high-voltage bus 120. Referring to fig. 2, holes are formed at corresponding positions on the sidewalls of two adjacent switch cabinet models 110 in the same row according to the size of the cabinet penetrating sleeve 130, so that the cabinet penetrating sleeve 130 is installed to fix and connect the adjacent switch cabinet models 110, and the cabinet penetrating sleeve 130 also fixes the high-voltage bus 120 penetrating through the cabinet penetrating sleeve 130.
The defect models 150 are disposed in one or more of the switch cabinet models 110, and the defect models 150 are connected to the high voltage bus 120 for generating partial discharge signals. The number of defect models 150 may be one or more. When there is only one defect model 150, the defect model 150 can be disposed in any one of the switch cabinet models 110. When there are a plurality of defect models 150, the defect types of the defect models 150 may be the same, may be partially the same, or may be different, and two different defect models 150 may be disposed in the same switch cabinet model 110. The switch cabinet model 110 in which each defect model 150 is placed is not limited, and various situations in actual partial discharge of the switch cabinet can be simulated by placing each defect model 150 in different switch cabinet models 110. For example, when the same defect model 150 is located in different switch cabinet models 110, the simulated partial discharge locations are different; for another example, when the defect models 150 of different defect types are located in the same switch cabinet model 110, the positions of the simulated partial discharges are the same, but the partial discharge types or the strengths of the partial discharge signals may be different.
The power supply device 140 is disposed outside the switch cabinet model 110, and the power supply device 140 is connected to the high voltage bus 120 and configured to apply a preset voltage to the high voltage bus 120. The preset voltage is an alternating current voltage set according to the working condition of the actual transformer substation, and the size of the preset voltage can be equal to the voltage of the actual transformer substation and can also be larger than or smaller than the voltage of the actual transformer substation. After the power supply device 140 applies a preset voltage to the high-voltage bus 120, the defect model 150 connected to the high-voltage bus 120 inside the switch cabinet model 110 performs partial discharge to simulate a scene of the actual switch cabinet in which the partial discharge occurs.
The monitoring device 160 is used for monitoring the partial discharge signal of the switch cabinet model 110. The monitoring device 160 can collect the partial discharge signals of the switch cabinet models 110 and output the signals in the forms of display screen, projection, voice and the like, so that an operator can know the partial discharge conditions inside each switch cabinet model 110, and the operator can summarize the experience of the partial discharge obtained by the experiment, such as the detection method, the positioning method, the defect identification method and the like.
According to the simulation test system, the switch cabinet models 110 are at least two and are arranged in an array mode, namely, the multi-surface switch cabinet model 110 is adopted for carrying out a partial discharge test, and compared with a traditional simulation test mode adopting a single-surface switch cabinet, the simulation test system can simulate a field test environment more truly, so that the experience and the method summarized according to the test result are more suitable for field test.
In one embodiment, all of the switch cabinet models 110 are aligned, the high voltage bus 120 sequentially passes through all of the switch cabinet models 110, i.e., the multi-sided switch cabinet models 110 are arranged side by side, the adjacent switch cabinet models 110 are fixed by the through-cabinet bushing 130, and the high voltage bus 120 passes through the switch cabinet models 110 and the through-cabinet bushing 130 at intervals. Therefore, the equipment structure is simplified, the consumable is reduced, and on the basis of reducing the occupied space of the simulation test system, the field arrangement mode of the high-voltage switch cabinet of the actual transformer substation is simulated more truly, so that the experience obtained by testing by using the simulation test system is more effectively suitable for field detection. In other embodiments, the switch cabinet models 110 may be arranged in multiple rows and columns, the high voltage bus 120 sequentially passes through all the switch cabinet models 110 in the same row, and the high voltage bus 120 in each row may be connected together.
In one embodiment, all the switch cabinet models 110 are scaled down according to the actual size of the switch cabinet, which can reduce the consumables and the overall occupied area of the simulation test system. In other embodiments, the dimensions of each switchgear model 110 may also be the same or similar to the actual substation switchgear dimensions.
In one embodiment, a removable partition 111 is disposed inside the switch cabinet model 110, the partition 111 can be used to divide the inside of the switch cabinet model 110 into a plurality of functional compartments, and the defect model 150 is disposed in one or more of the functional compartments. The inside of the switch cabinet model 110 may be divided into different numbers of function compartments by using different numbers of partitions 111, and the size and structure of each function compartment may be divided according to the arrangement position of the partitions 111. The functional room may be divided according to the internal structure of the actual switch cabinet, so that the internal structure of the switch cabinet model 110 is consistent with the internal structure of the actual switch cabinet. The partition boards 111 inside the switch cabinet model 110 can be detached and installed at will, so that even if the actual internal structure of the switch cabinet is changed, the number and the positions of the partition boards 111 can be changed, and the internal structure of the switch cabinet model 110 is still consistent with the changed actual internal structure of the switch cabinet.
The division of the functional room can be correspondingly changed according to the change of the structure of the actual switch cabinet on site. When the actual switch cabinet comprises a busbar, an instrument room, a handcart room and a cable room, correspondingly, the interior of the switch cabinet model 110 is divided into three layers through the partition boards 111, and each layer is used as a functional room, so that the functional room of the switch cabinet model 110 sequentially simulates the busbar, the instrument room 112, the handcart room 113 and the cable room 114 from top to bottom.
In one embodiment, the power supply device 140 includes a transformer for adjusting the magnitude of the ac voltage output to the high voltage bus 120, so that the ac voltage output to the high voltage bus 120 is equal to the predetermined voltage. For example, the transformer may be a test transformer. The test transformer has small volume, light weight, compact structure and complete functions, and is suitable for AC high-voltage tests on various high-voltage electrical equipment. The test transformer may step up the power supply voltage to obtain a preset voltage and apply the preset voltage to the high voltage bus 120. When the test transformer applies a predetermined voltage to the high voltage bus 120, the defect model 150 placed inside the switch cabinet model 110 releases a partial discharge signal, and the partial discharge signal is conducted to the adjacent switch cabinet model 100 through the cabinet penetrating bushing. By the method for manually arranging the defect model 150, the partial discharge condition of the actual switch cabinet on site can be simulated. For example, a test transformer with a capacity of 10KVA may be used to generate an AC voltage of 10KV/50Hz, i.e., a predetermined voltage of 10 KV.
In an embodiment, the material of the high voltage bus 120 is the same as the actual high voltage bus, or the model of the high voltage bus 120 is the same as the actual high voltage bus, so as to simulate the field test environment more truly. For example, in accordance with an actual high voltage bus on the site, the high voltage bus 120 is made of copper material, the rated voltage is 10KV, the rated current is 400A, when the operating voltage on the high voltage bus 120 is 2500V or less, the unit insulation resistance is not less than 1000M Ω, and the protection grade of the high voltage bus 120 is ip 40. In addition, it is also necessary to ensure that the high-voltage bus 120 does not discharge when performing the partial discharge live detection simulation test, so as to avoid interfering with the monitoring of the partial discharge signal, so that the monitoring result is inaccurate.
In one embodiment, the through-cabinet bushing 130 includes an epoxy layer 132 on an inner layer and a ceramic layer 131 covering the epoxy layer 132. The epoxy layer 132 has an accommodating space therein through which the high voltage bus bar 120 passes. The rated voltage of the through-cabinet bushing 130 may be set to 10KV and the rated current may be set to 1250A.
The epoxy layer 132 has good adhesion and electrical insulation properties, wherein the good adhesion can help the epoxy layer 132 adhere to the ceramic layer 131 more firmly and not easily to fall off, and can also enhance the fixation of the high voltage bus 120. Because the epoxy layer 132 and the ceramic layer 131 are insulating layers, the insulating property of the cabinet bushing 130 is improved, and the good electrical insulating property can effectively prevent the high-voltage bus 120 from generating electric leakage accidents.
In one embodiment, the monitoring device 160 includes a sensor and a monitoring module. The number of sensors is the same as and corresponds to one with the switch cabinet model 110. Each sensor is correspondingly installed on the surface of one switch cabinet model 110 and is used for collecting partial discharge signals of the corresponding switch cabinet model 110. In this embodiment, use magnetism to inhale formula partial discharge sensor, can gather the partial discharge signal that corresponds cubical switchboard model 110 with the direct absorption of partial discharge sensor at cubical switchboard model 110's surface. In other embodiments, sensors such as electromagnetic wave sensors and high-frequency current sensors may be used to collect the partial discharge signals of the switch cabinet model 110.
The monitoring module is connected with the sensor and used for receiving and outputting a partial discharge signal. The monitoring module receives the partial discharge signal from the sensor and outputs the partial discharge signal for further processing. For example, the monitoring module may output the partial discharge signal received by each sensor through a display screen, a projection, a voice, and the like. The monitoring module can be further arranged to communicate with the mobile terminal in wired communication modes such as metal wires and optical fibers or wireless communication modes such as WIFI, Bluetooth and infrared, partial discharge signals to be output are output to the mobile terminal, and therefore operators can remotely monitor the partial discharge signals of the switch cabinet models 110.
In one embodiment, the monitoring module outputs the partial discharge signal, and the monitoring module outputs the amplitude of the partial discharge signal and the time when the partial discharge signal is received. The operator can judge the severity of the partial discharge according to the amplitude of the partial discharge signal, and can judge the position of the partial discharge according to the time of receiving the partial discharge signal.
Illustratively, the severity of the partial discharge is classified into a plurality of classes, for example, a first class, a second class and a third class, according to the magnitude of the partial discharge signal. The amplitudes of the partial discharge signals corresponding to the first level, the second level and the third level are gradually increased. When the amplitude of the partial discharge signal reaches a first level, the monitoring module only outputs the partial discharge signal for monitoring by an operator; when the amplitude of the partial discharge signal reaches a second level, the monitoring module outputs the partial discharge signal for an operator to monitor and prompts the operator to overhaul; and a control device connected with the monitoring module and the power supply device 140 is arranged, when the amplitude of the partial discharge signal reaches a third level, the monitoring module triggers an alarm signal and outputs the alarm signal to the control device, so that the control device cuts off the power supply of the power supply device 140 to the high-voltage bus 120, and the equipment damage caused by the excessively serious partial discharge is avoided. And, grading the severity of partial discharge can also provide reference for the protection of partial discharge of the field switchgear.
In the switch cabinet model 110 of the same row, the partial discharge signal amplitude of the switch cabinet model 110 in which the defective model 150 is placed should be the largest, and the partial discharge signal is also transmitted to other switch cabinet models 110 of the same row through the cabinet penetrating bushing 130, so that the sensors corresponding to the other switch cabinet models 110 also detect the partial discharge signal, but the partial discharge signal amplitude is smaller than that of the switch cabinet model 110 in which the defective model 150 is placed. The position of the defect model 150 can be calculated according to the amplitude of the partial discharge signal detected by each sensor and the time of receiving the partial discharge signal. And the interference factors of the partial discharge signals such as grounding interference, electromagnetic radiation interference and corona discharge can be eliminated by comparing the partial discharge signals corresponding to each switch cabinet model 110, and the influence of the interference factors can be reduced by arranging a filtering unit in the monitoring module, so that the reference can be given to the interference of the partial discharge detection of the actual switch cabinet.
In this embodiment, each sensor collects a partial discharge signal of the corresponding switch cabinet model 110, and the monitoring module outputs the partial discharge signal, which includes an amplitude of the partial discharge signal and a time when the partial discharge signal is received. Therefore, an operator can conveniently research the propagation mode of the partial discharge signals in the actual switch cabinet, the arrangement strategy of the sensors, the interference elimination technology of the partial discharge signals of the multi-surface switch cabinet, the positioning technology and the like according to the output result of the monitoring module.
In other embodiments, the monitoring module may further generate a waveform map, such as a Phase Resolved Partial map (PRPD), according to the Partial Discharge signal collected by each sensor, and the type of the Partial Discharge may be determined according to the waveform map of the Partial Discharge signal.
In an embodiment, with reference to fig. 1 to 4, six switch cabinet models 110 are arranged in a row, two adjacent switch cabinet models 110 are fixed by a cabinet penetrating sleeve 130, and the high voltage bus 120 penetrates through the cabinet penetrating sleeve 130 and the switch cabinet models 110 at intervals. The cabinet penetrating sleeve 130 comprises an inner epoxy layer 132 and a ceramic layer 131 covering the epoxy layer 132, and the epoxy layer 132 has an accommodating space for the high-voltage bus bar 120 to penetrate through. The rated voltage of the through-cabinet bushing 130 is set to 10kV and the rated current is set to 1250A. The shells of the adjacent switch cabinet models 110 are subjected to short-circuit treatment and are grounded.
A test transformer with a capacity of 10kVA is provided outside the switchgear cabinet model 110. The test transformer is connected to the power supply and pressurizes the power supply voltage to output a preset voltage of 10kV to the high voltage bus 120. The high-voltage bus 120 is made of copper materials, the rated voltage is 10KV, the rated current is 400A, when the voltage is below 2500V in operation on the high-voltage bus 120, the unit insulation resistance is not less than 1000 MOmega, and the protection grade of the high-voltage bus 120 is ip 40.
The size of the switch cabinet model 110 is reduced according to the size of an actual switch cabinet, for example, the size of the switch cabinet model 110 is set to 850mm × 390mm × 1800 mm. The cabinet body material of the switch cabinet model 110 adopts a cold-rolled steel plate, and the thickness is set to be 3 mm. The interior of the switch cabinet model 110 is divided into three layers by using a partition 111, and each layer corresponds to a functional chamber in an actual switch cabinet. The simulation bus bar and instrument room 112, the simulation handcart room 113 and the simulation cable room 114 are arranged from top to bottom in sequence. One of the defect models 150 is disposed in the simulated hand truck compartment 113 of the third switchgear model 110 counted from left to right, and the other defect model 150 is disposed in the simulated hand truck compartment 113 of the fifth switchgear model 110 counted from left to right. Both defect models 150 are connected to the high voltage bus bar 120 by copper bars. After the test transformer outputs a preset voltage to the high voltage bus 120, the two defect models 150 send out partial discharge signals to simulate actual partial discharge conditions.
Monitoring devices 160 include magnetism and inhale formula partial discharge sensor and monitoring module, inhale formula partial discharge sensor at the preceding cabinet door outside installation of every cubical switchboard model 110 to gather the partial discharge signal that corresponds cubical switchboard model 110. The monitoring module is connected with the sensor and used for receiving the partial discharge signal detected by the sensor and outputting the partial discharge signal, such as information of the amplitude of the partial discharge signal, the time when the partial discharge signal is received and the like.
In the present embodiment, when the simulation test system is powered on and the voltage applied to the high voltage bus 120 reaches the preset voltage, the defect models 150 disposed in the third and fifth switch cabinet models 110 from left to right emit partial discharge signals. The magnetic-type partial discharge sensors disposed on the two switch cabinet models 110 detect the partial discharge signal first, and the amplitude of the detected partial discharge signal is maximum. From these two pieces of information, the operator can determine where the defect model is located. Moreover, since the partial discharge signal is propagated to the other switch cabinet models 110 through the cabinet bushing 130, the sensors on the surfaces of the six switch cabinet models 110 can acquire the partial discharge signal, but due to attenuation of the partial discharge signal in the propagation process, the amplitude of the partial discharge signal acquired by the sensors on the surfaces of the different switch cabinet models 110 and the time for receiving the partial discharge signal are different, so that a basis is provided for studying experience and technology of live detection of the partial discharge signal. The detection method is also suitable for the field.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A simulation test system applied to switch cabinet partial discharge live detection is characterized by comprising:
the switch cabinet models are at least two and are arranged in an array;
the high-voltage bus sequentially penetrates through the switch cabinet models in the same row;
two ends of the cabinet penetrating sleeve are respectively fixed with two adjacent switch cabinet models in the same row so as to allow the high-voltage bus to penetrate through the cabinet penetrating sleeve;
the power supply device is connected with the high-voltage bus and used for applying preset voltage to the high-voltage bus;
the defect model is arranged in one or more switch cabinet models, is connected with the high-voltage bus and is used for generating a partial discharge signal; and
and the monitoring device is used for monitoring the partial discharge signal of the switch cabinet model.
2. The system of claim 1, wherein the switchgear modules are arranged in a row, and the high voltage bus bar passes through all of the switchgear modules in sequence.
3. The system of claim 1, wherein each of the switchgear models is scaled down in accordance with actual switchgear size.
4. The system of claim 1, wherein a removable partition is disposed inside the switchgear cabinet model, and the partition is used for dividing the inside of the switchgear cabinet model into a plurality of functional chambers; the defect model is arranged in one or more functional chambers.
5. The system of claim 4, wherein the functional compartments include a simulated busbar and instrumentation compartment, a simulated handcart compartment, and a simulated cable compartment.
6. The system of claim 1, wherein the high voltage bus is the same material as an actual high voltage bus or the high voltage bus is the same type as the actual high voltage bus.
7. The system of claim 1, wherein the through-cabinet bushing comprises an epoxy layer on an inner layer and a ceramic layer covering the epoxy layer, and the epoxy layer is internally provided with a containing space for the high-power bus to pass through.
8. The system of claim 1, wherein the monitoring device comprises:
the sensors are the same in number and correspond to the switch cabinet models one by one, and the sensors are used for acquiring corresponding partial discharge signals of the switch cabinet models;
and the monitoring module is connected with the sensor and used for receiving and outputting the partial discharge signal.
9. The system of claim 8, wherein the monitoring module, when outputting the partial discharge signal of the switchgear model, comprises outputting an amplitude of the partial discharge signal and a time at which the partial discharge signal is received.
10. The system of claim 1, wherein the power supply means comprises: the transformer is used for adjusting the size of the alternating voltage output to the high-voltage bus so that the alternating voltage output to the high-voltage bus is equal to the preset voltage.
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| CN114034993A (en) * | 2021-11-05 | 2022-02-11 | 国网青海省电力公司检修公司 | Local discharge positioning test method for switch cabinet based on TEV and ultrahigh frequency method |
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Application publication date: 20201023 |