An experimental device for simulating insulation faults and detecting multiple parameters of separable connectors of gas-insulated switchgear

Abstract

The present invention relates to an experimental device for simulating insulation faults and detecting multi-parameters of separable connectors in gas-insulated switchgear, belonging to the field of power monitoring. The experimental device includes an insulation fault simulation unit, an environmental parameter simulation unit, and an on-line monitoring unit. The experimental device can conduct insulation fault simulation experiments on separable connectors under different environmental temperature and humidity conditions, and at the same time can on-line monitor the concentration of gases generated by the cracking of insulating materials and the partial discharge quantity parameters, improving the level and accuracy of fault simulation.

Description

Technical Field

[0001] The present invention relates to the field of power monitoring, and particularly relates to an experimental device for simulating insulation faults and detecting multiple parameters of a separable connector of an inflatable switchgear. Background Art

[0002] With the increasing number of applications of inflatable switchgears, the number of insulation faults is also rising year by year. Once an insulation fault occurs in the equipment, it will seriously affect the safe and stable operation of the power grid, causing serious property losses and posing a serious threat to personal safety. Therefore, adopting effective on-line detection methods to evaluate and warn the insulation state of inflatable switchgears is a necessary measure to avoid major insulation accidents and improve the power supply reliability of the power grid.

[0003] The shielded separable connector is a key component for connecting an inflatable switchgear and a cable, and is used to connect the incoming and outgoing line bushings and the power cable to achieve electrical connection and insulation functions. However, in actual applications, the shielded separable connector will form power lines axially along the conductor core, resulting in uneven electric field distribution and prone to electric field concentration. Therefore, the separable connector has become a weak link in electrical equipment such as high-voltage cables and switchgears, and is also the main part where operating faults occur. In recent years, the research on the insulation fault warning technology of the separable connector of inflatable switchgears has become a research hotspot. The pulse current method is currently the only measurement method recognized by the IEC and can quantify the severity of PD through physical parameters such as apparent discharge quantity. The equivalent capacitance of the bushing shielding ring of the inflatable switchgear is used as the coupling capacitance for the partial discharge test of the pulse current method, and a partial discharge pulse current detection circuit is constructed with a live display device, so that the partial discharge test method based on the pulse current method can be applied to the on-line monitoring field. The chemical detection method is a method for on-line monitoring the concentration and composition of gases generated by the cracking of insulating materials during partial discharge of electrical equipment to judge the insulation state of electrical equipment. The chemical detection method has the advantages of strong anti-interference and easy automation. Therefore, for the research on the insulation fault warning technology of the separable connector of inflatable switchgears, many researchers are studying the integrated monitoring method of pulse current and chemical detection. However, in-depth research on the integrated monitoring method of pulse current and chemical detection requires simulating the variation laws of gas release quantity and partial discharge quantity of the separable connector under different environmental parameters and different insulation fault conditions. The existing experimental devices often cannot take into account both fault simulation and parameter monitoring, and do not have complete experimental capabilities. Therefore, multiple experimental devices need to be used for experiments and detections, and the test results often cannot meet the real-time requirements, with a large demand for equipment funds and low work efficiency. Summary of the Invention

[0004] The object of the present invention is to provide an experimental device for simulating insulation faults and detecting multiple parameters of separable connectors in gas-insulated switchgear. This experimental device can conduct simulation experiments on insulation faults of separable connectors under different environmental temperature and humidity conditions, and at the same time can online monitor parameters such as the concentration of gas generated by the cracking of insulating materials and the partial discharge amount, improving the level and accuracy of fault simulation.

[0005] An experimental device for simulating insulation faults and detecting multiple parameters of separable connectors in gas-insulated switchgear, including an insulation fault simulation unit, an environmental parameter simulation unit and an online monitoring unit.

[0006] Optionally, the device includes: an experimental box housing, a monitoring device host, an antenna, a sensor module, an air humidifier, a protective cover, a heating plate, a separable connector, a cable, an insulating cylinder, a through-box bushing, a dehumidifier, a fan, a controller and a power supply;

[0007] The sensor module, the separable connector, the cable and the insulating cylinder are located inside the experimental box housing;

[0008] The monitoring device host, the antenna, the air humidifier, the protective cover, the heating plate, the dehumidifier, the fan, the controller and the power supply are located outside the experimental box housing;

[0009] The through-box bushing passes through the inner and outer sides of the experimental box housing.

[0010] Optionally, the monitoring device host and the antenna are fixed on the upper end of the experimental box housing, the protective cover and the heating plate are fixed on the front of the experimental box housing, and the air humidifier, the dehumidifier, the fan, the controller and the power supply are fixed on the side of the experimental box housing.

[0011] Optionally, one end of the insulating cylinder is fixed on the lower end face of the experimental box housing, the other end of the insulating cylinder is connected to one end of the cable, the other end of the cable is connected to one end of the separable connector, the other end of the separable connector is connected to one end of the through-box bushing located inside the experimental box housing, and the other high-voltage access point of the through-box bushing is located outside the experimental box housing and is connected to a high-voltage adjustable power supply to conduct an insulation fault simulation experiment.

[0012] Optionally, the through-box bushing is provided with a bushing shielding ring, and the bushing shielding ring has a bushing shielding ring interface.

[0013] Optionally, the experimental box housing, the separable connector, the cable, the insulating cylinder and the through-box bushing form an insulation fault simulation unit;

[0014] The monitoring device host, the antenna, the air humidifier, the protective cover, the heating plate, the dehumidifier, the fan, the controller and the power supply form an environmental parameter simulation unit;

[0015] The monitoring device host, the antenna, the sensor module and the power supply form an online monitoring unit.

[0016] Optionally, the monitoring data signal of the monitoring device host can be transmitted through an antenna and uploaded to the server through the network. The data platform statistically processes and displays the data. At the same time, the data platform can also perform reverse control and parameter setting on the host.

[0017] Optionally, by setting different fitting and installation methods between the separable connector and the bushing, the insulation faults that can be simulated by the experimental device at least include the separable connector being not properly assembled, the stress cone of the separable connector being disengaged, the presence of metal foreign objects between the bushing and the separable connector, the presence of metal foreign objects between the insulating plug and the separable connector, the presence of depressions on the surface of the bushing, and the presence of depressions on the inner surface of the separable connector.

[0018] Optionally, the partial discharge test interfaces of the monitoring device host for the three phases A, B, and C are respectively connected to the partial discharge signals on the shielding ring interfaces of the bushings passing through the tank for the three phases A, B, and C by coaxial cables to perform partial discharge monitoring.

[0019] Optionally, the monitoring device host sends instructions to the controller, and the controller comprehensively controls the coordinated operation of the air humidifier, heating plate, dehumidifier, and fan to complete the regulation of the internal environmental parameters of the test chamber.

[0020] Optionally, in this embodiment, a partial discharge measurer support is provided on the conductor side of the bushing shielding ring close to the bushing passing through the tank. The conductor side is where the cable is located in the insulating cylinder. Optionally, the partial discharge measurer support is conical, and the cone can be a triangular cone or a conical shape.

[0021] Optionally, in the longitudinal direction of the bushing passing through the tank, the lengths of the bushing shielding ring and the partial discharge measurer support are h and h1 respectively, and the units of h and h1 are mm; Optionally, h / h1 is an integer, or 2 ≤ h / h1, or 4 ≤ h / h1, or 8 ≤ h / h1, or 10 ≤ h / h1; Optionally, h1 < h. By setting the length of the partial discharge measurer support to be less than the length of the bushing shielding ring, the creepage distance of the bushing passing through the tank is not affected. Due to the setting of the partial discharge measurer support, partial discharge occurs at the conductor of the bushing passing through the tank and the end of the partial discharge measurer support, so that the partial discharge measurement location can be stably determined.

[0022] Optionally, the partial discharge measurer support is made of an insulating material, such as resin. A partial discharge measurer is provided at the end of the partial discharge measurer support. The partial discharge measurer is connected to the monitoring device host through a cable. It can be understood that each of the three phases A, B, and C uses a cable to connect to the monitoring device host, so as to accurately feedback the partial discharge measurement signal to the monitoring device host. Optionally, a hole is provided from the end to the bottom of the partial discharge measurer support, and the cable is laid in the hole. Optionally, the partial discharge measurer is an iron sheet or a copper sheet.

[0023] Optionally, there are multiple partial discharge measuring device brackets, for example, three. The partial discharge measuring device brackets are arranged circumferentially on the bushing shielding ring, and the ends of the partial discharge measuring device brackets are connected by a circular wire. Thus, when partial discharge occurs between the partial discharge measuring device brackets, the partial discharge signal is conducted to the partial discharge measuring device through the circular wire, thereby improving the partial discharge monitoring level in the circumferential direction of the bushing shielding ring.

[0024] Beneficial technical effects:

[0025] Through the experimental device of the present invention, insulation fault simulation experiments of separable connectors can be carried out under different environmental temperature and humidity conditions, and at the same time, parameters such as the concentration of gas generated by the cracking of insulating materials and the partial discharge amount can be monitored online. This experimental device can take into account both fault simulation and parameter monitoring, and has complete experimental capabilities. By means of online monitoring, the values and change trends of various parameters during the experimental process are monitored in real time, and the simulation experimental process is more in line with the actual operating state. While reducing the capital demand for experimental equipment, the work efficiency is improved, and the fault simulation level and accuracy are also improved. Description of the Drawings

[0026] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0027] Figure 1 It is a front view structural schematic diagram of an insulation fault simulation and multi-parameter detection experimental device for a separable connector of a gas-insulated switchgear provided by an embodiment of the present invention.

[0028] Figure 2 It is an overall structural schematic diagram of an insulation fault simulation and multi-parameter detection experimental device for a separable connector of a gas-insulated switchgear provided by an embodiment of the present invention.

[0029] Figure 3 It is a partial structural schematic diagram of an insulation fault simulation experimental unit of an insulation fault simulation and multi-parameter detection experimental device for a separable connector of a gas-insulated switchgear provided by an embodiment of the present invention.

[0030] Figure 4 It is a controller connection schematic diagram of an environmental parameter simulation unit of an insulation fault simulation and multi-parameter detection experimental device for a separable connector of a gas-insulated switchgear provided by an embodiment of the present invention.

[0031] Figure 5 It is a device interface structural schematic diagram of an environmental parameter simulation unit of an insulation fault simulation and multi-parameter detection experimental device for a separable connector of a gas-insulated switchgear provided by an embodiment of the present invention.

[0032] Figure 6 Schematic diagram of sensor connection of the on-line monitoring device unit of an insulating fault simulation and multi-parameter detection experimental device for a separable connector of an inflatable switchgear provided by an embodiment of the present invention.

[0033] Figure 7 Large-scale drawing of the bushing and the bushing shielding ring of an embodiment of the present invention.

[0034] Figure 8 Schematic diagram of the arrangement of the partial discharge measuring device and the bushing shielding ring of an embodiment of the present invention.

[0035] Figure 9 Schematic diagram of the support of the partial discharge measuring device of an embodiment of the present invention.

[0036] Figure 10 Schematic diagram of the arrangement of the partial discharge measuring device and the bushing shielding ring of another embodiment of the present invention.

[0037] Figure 11 Schematic diagram of the support of the partial discharge measuring device of another embodiment of the present invention. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that in this document, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including one..." does not exclude the presence of additional identical elements in the process, method, article or device including that element.

[0040] Embodiment 1

[0041] The connection modes of the various parts of the experimental device are as Figures 1-6 shown. An insulating fault simulation and multi-parameter detection experimental device for a separable connector of an inflatable switchgear includes: an experimental box housing 1, a monitoring device host 2, an antenna 3, a sensor module 4, an air humidifier 5, a protective cover 6, a heating plate 7, a separable connector 8, a cable 9, an insulating cylinder 10, a through-box bushing 11, a dehumidifier 12, a fan 13, a controller 14, and a power supply 15.

[0042] Optionally, the antenna 3 is a 4G, 5G or 6G antenna.

[0043] Preferably, the sensor module 4, the separable connector 8, the cable 9 and the insulating cylinder 10 are located inside the experimental box housing 1.

[0044] Preferably, the measurement device host 2, the antenna 3, the air humidifier 5, the protective cover 6, the heating plate 7, the dehumidifier 12, the fan 13, the controller 14, and the power supply 15 are located outside the experimental box housing 1.

[0045] Preferably, the through-box sleeve 11 passes through the inner and outer sides of the experimental box housing 1.

[0046] Preferably, the measurement device host 2 and the antenna 3 are fixed to the upper end of the experimental box housing 1, the protective cover 6 and the heating plate 7 are fixed to the front of the experimental box housing 1, and the air humidifier 5, the dehumidifier 12, the fan 13, the controller 14, and the power supply 15 are fixed to the side of the experimental box housing 1.

[0047] Preferably, one end of the insulating cylinder 10 is fixed to the lower end face of the experimental box housing 1, the other end of the insulating cylinder 10 is connected to one end of the cable 9, the other end of the cable 9 is connected to one end of the separable connector 8, the other end of the separable connector 8 is connected to one end of the through-box sleeve 11 located inside the experimental box housing 1, and the high-voltage access point 11-1 at the other end of the through-box sleeve 11 is located outside the experimental box housing 1 and connected to a high-voltage adjustable power supply for conducting an insulation fault simulation experiment.

[0048] Preferably, the separable connector 8 is provided with a grounding connection point 8-1.

[0049] Preferably, the through-box sleeve 11 is provided with a sleeve shielding ring interface 11-2.

[0050] Preferably, the experimental box housing 1, the separable connector 8, the cable 9, the insulating cylinder 10, and the through-box sleeve 11 form an insulation fault simulation unit.

[0051] Preferably, the monitoring device host 2, the antenna 3, the air humidifier 5, the protective cover 6, the heating plate 7, the dehumidifier 12, the fan 13, the controller 14, and the power supply 15 form an environmental parameter simulation unit.

[0052] Preferably, the monitoring device host 2, the antenna 3, the sensor module 4, and the power supply 15 form an online monitoring unit.

[0053] Preferably, the temperature and humidity are set through the host 2 of the monitoring device, and instructions are sent to the controller 14. The controller 14 controls the operation of the air humidifier 5, the heating plate 7, the dehumidifier 12 and the fan 13 to adjust the internal environmental parameters of the test chamber. Preferably, the host serial port 2-1 on the host 2 of the monitoring device is communicatively connected to the controller serial port 14-1 on the controller 14 to monitor the device status.

[0054] The controller 14 controls the heating plate 7, the air humidifier 5, the dehumidifier 12 and the fan 13 respectively through the heating plate control interface 14-2, the air humidifier control interface 14-3, the dehumidifier control interface 14-4 and the fan control interface 14-5.

[0055] The fan 13 has a fan power signal interface 13-1 and fan blades 13-2.

[0056] The dehumidifier 12 has a dehumidifier power signal interface 12-1 and a dehumidifier drain port 12-2.

[0057] The air humidifier 5 has an air humidifier power signal interface 5-1, a water injection port 5-2 and a water vapor atomization outlet 5-3.

[0058] The host 2 of the monitoring device has a sensor connection port 2-2, a power interface 2-3, a screen 2-4, a button 2-5 and an antenna interface 2-6. The antenna 3 is communicatively connected to the antenna interface 2-6 of the monitoring device host 2.

[0059] The sensor module 4 has a power signal connection port 4-1 and a sensor probe 4-2. The sensor probe 4-2 monitors the temperature, humidity and gas concentration inside the test chamber. The monitored gas types can be selected according to experimental requirements. The host 2 of the monitoring device can monitor the partial discharge quantity and partial discharge frequency of three phases A, B and C. The host 2 of the monitoring device transmits the monitored data signal through the antenna 3 and uploads it to the server through the network. The data platform statistically analyzes and displays the data. At the same time, the data platform can also perform reverse control and parameter setting on the host.

[0060] Preferably, a gas sensor is used to monitor the characteristic gas concentration. Optionally, the characteristic gas concentration is nitric oxide gas, nitrogen dioxide gas, total hydrocarbons or other organic and inorganic volatile gases.

[0061] When conducting the insulation fault simulation experiment, the grounding connection point 8-1 is grounded, and the high-voltage access port is connected to an external adjustable three-phase high-voltage power supply for the insulation fault simulation experiment. The optional maximum allowable access voltage is 45 kV. The A, B, and C phase partial discharge test interfaces of the monitoring device host 2 are respectively connected to the A, B, and C phase through-box bushing shielding ring interfaces 11-2 by coaxial cables for partial discharge monitoring. The temperature and humidity inside the experimental box are controlled. The monitoring device host sends instructions to the controller, and the controller comprehensively controls the air humidifier, heating plate, dehumidifier, and fan to cooperate to complete the regulation of the internal environmental parameters of the test box. The screen of the monitoring device host can display the internal temperature, humidity, A, B, and C phase partial discharge amounts, partial discharge frequencies, and characteristic gas concentrations of the experimental box.

[0062] The A, B, and C phase partial discharge test interfaces are used for accessing partial discharge signals. At least one A, B, and C phase partial discharge test interface is set in each of the A phase, B phase, and C phase, specifically the A phase partial discharge signal interface, B phase partial discharge signal interface, and C phase partial discharge signal interface. The A, B, and C phase partial discharge test interfaces can simultaneously access, collect, and detect the partial discharge signals of the A, B, and C phases of the gas-insulated switchgear.

[0063] The A, B, and C phase partial discharge test interfaces are connected to the partial discharge measurer through cables, and the partial discharge measurer is arranged at the A, B, and C phase bushing shielding ring interfaces 11-2 (as Figure 3 shown).

[0064] The monitoring device host can be connected to 1-7 sensors according to the experimental requirements. The resolution of partial discharge amount monitoring is 0.5 pC, the measurement accuracy is ±1 pC, and the sampling frequency range is 0-500 KHz. The gas sensor has a temperature compensation function, and the temperature compensation range is -40°C to +70°C. The measurement range of the characteristic gas sensor is 0-1000 ppm, the resolution is 0.1 ppm, and the error is ±3%. The temperature measurement range of the temperature sensor is -40°C - 125°C, the resolution is 0.1°C, and the error is ±0.2°C. The humidity measurement range is 0-100%, the resolution is 0.1%, and the error is ±2%. The internal temperature adjustment range of the experimental box is room temperature - 70°C, and the humidity adjustment range is 0-100%. The monitoring device host communicates with the sensors through the RS485 method, and the monitoring device host communicates with the controller, the controller communicates with the air humidifier, heating plate, dehumidifier, and fan through the serial communication method.

[0065] By setting different fitting and experimental installation methods between the separable connector and the bushing, the insulation faults that can be simulated by this experimental device include but are not limited to the separable connector being assembled in place incompletely, the stress cone of the separable connector being disengaged, there being metal foreign objects between the bushing and the separable connector, there being metal foreign objects between the insulating plug and the separable connector, there being depressions on the bushing surface, and there being depressions on the inner surface of the separable connector.

[0066] Embodiment 2

[0067] This embodiment is an improvement based on Embodiment 1.

[0068] See Figure 7 , a sleeve shielding ring is provided on the feedthrough sleeve 11, and a sleeve shielding ring interface 11-2 is provided on the sleeve shielding ring. The sleeve shielding ring interface 11-2 is arranged at one end of the feedthrough sleeve 11 located inside the test chamber housing 1. Figure 7 The distributed capacitance 31 between the conductor of the feedthrough sleeve 11 and the sleeve shielding ring is schematically shown in . When partial discharge occurs in the cable chamber, the conductor of the feedthrough sleeve 11 discharges to the sleeve shielding ring through the distributed capacitance. Due to the stray nature of the distributed capacitance, it is difficult to determine the partial discharge, so the strength of the partial discharge cannot be accurately detected in the prior art, and the detection of the partial discharge is not accurate enough.

[0069] See Figures 8-9 , in this embodiment, a partial discharge measuring device support 32 is arranged on the side of the sleeve shielding ring close to the conductor of the feedthrough sleeve 11. The conductor side is the cable 9 located in the insulating cylinder 10. Optionally, the partial discharge measuring device support 32 is conical, and the cone can be a triangular cone or a conical cone.

[0070] Optionally, in the length direction of the feedthrough sleeve 11, the lengths of the sleeve shielding ring and the partial discharge measuring device support 32 are h and h1 respectively, and the units of h and h1 are mm; optionally, h / h1 is an integer, or 2≤h / h1, or 4≤h / h1, or 8≤h / h1, or 10≤h / h1; optionally, h1 < h. By setting the length of the partial discharge measuring device support 32 to be less than the length of the sleeve shielding ring, the creepage distance of the feedthrough sleeve 11 is not affected. Due to the setting of the partial discharge measuring device support 32, the partial discharge occurs at the conductor of the feedthrough sleeve 11 and the end of the partial discharge measuring device support 32, so that the partial discharge measuring location can be stably determined.

[0071] Optionally, the partial discharge measuring device support 32 is made of insulating material, such as resin. A partial discharge measuring device 41 is arranged at the end of the partial discharge measuring device support 32. The partial discharge measuring device 41 is connected to the monitoring device host 2 through a cable 42. It can be understood that each of the A phase, B phase, and C phase uses 1 cable 42 to be connected to the monitoring device host 2, so as to accurately feed back the partial discharge measurement signal to the monitoring device host 2. Optionally, a hole is provided from the end to the bottom of the partial discharge measuring device support 32, and the cable 42 is arranged in the hole. Optionally, the partial discharge measuring device 41 is an iron sheet or a copper sheet.

[0072] Embodiment 3

[0073] This embodiment is an improvement based on Embodiment 2.

[0074] See Figure 10, there are multiple partial discharge measuring device brackets 32, for example, three of them. The partial discharge measuring device brackets 32 are arranged circumferentially on the bushing shielding ring, and the ends of the partial discharge measuring device brackets 32 are connected by a ring-shaped wire 33. Thus, when partial discharge occurs between the partial discharge measuring device brackets 32, the partial discharge signal is conducted to the partial discharge measuring device 41 through the ring-shaped wire 33, thereby improving the partial discharge monitoring level in the circumferential direction of the bushing shielding ring.

[0075] Embodiment 4

[0076] This embodiment is an improvement based on Embodiment 2 or 3.

[0077] In Embodiment 2 or 3, the partial discharge measurement location is accurately determined. However, if the partial discharge is weak, the control host may not be able to capture the partial discharge signal, and thus cannot measure the slow insulation weakening.

[0078] See Figure 11 , one or more grooves 43 are provided on the side surface of the partial discharge measuring device bracket 32, and a partial discharge point gas sensor 44 is arranged in the groove 43. The partial discharge point gas sensor 44 is connected to the monitoring device host 2 through a cable 45; when weak partial discharge occurs, the gas concentration at the partial discharge point changes, and the partial discharge point gas sensor 44 monitors the gas concentration at the partial discharge point and gives an early warning through the control host, thereby improving the insulation detection level.

[0079] Optionally, there is a gap between the partial discharge measuring device 41 and the groove 43; the gap is less than 0.8h1.

[0080] Embodiment 5

[0081] This embodiment is an improvement based on Embodiment 3 or 4.

[0082] See Figure 10, there are multiple partial discharge measuring device brackets 32, such as 3, 4, 5,..., 10. The partial discharge measuring device brackets 32 are arranged circumferentially on the bushing shielding ring. The ends of the partial discharge measuring device brackets 32 are connected by an annular wire 33. Thus, when partial discharge occurs between the partial discharge measuring device brackets 32, the partial discharge signal is conducted to the partial discharge measuring device 41 through the annular wire 33, thereby improving the monitoring level of partial discharge in the circumferential direction of the bushing shielding ring. In simulated insulation faults: the separable connector is not assembled in place, the stress cone of the separable connector is disengaged, there is a metal foreign object between the bushing and the separable connector, there is a metal foreign object between the insulating plug and the separable connector, there is a depression on the surface of the bushing, and there is a depression on the inner surface of the separable connector, the insulation distance between the conductor of the bushing-through cable 11 and the cable 9 becomes asymmetric. And under different fitting and experimental installation methods between the separable connector and the bushing, some of the asymmetry may be eliminated, resulting in a deviation between the experiment and the actual situation. In this actual example, the lengths of multiple partial discharge measuring device brackets 32 along the length direction of the bushing-through cable 11 are not equal. Optionally, the length of at least one partial discharge measuring device bracket 32 among the multiple partial discharge measuring device brackets 32 along the length direction of the bushing-through cable 11 is less than the average length of the multiple partial discharge measuring device brackets 32 along the length direction of the bushing-through cable 11. By changing the length of the partial discharge measuring device bracket 32 along the length of the bushing-through cable 11, the insulation distance is adjusted to improve the accuracy of the experimental device.

[0083] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0084] It should be noted that the serial numbers of the embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0085] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An experimental device for simulating insulation faults and detecting multiple parameters of detachable connectors of an inflatable switch cabinet, characterized in that: It includes insulation fault simulation unit, environmental parameter simulation unit and online monitoring unit; The experimental device comprises: an experimental box housing, a monitoring device host, an antenna, a sensor module, an air humidifier, a protective cover, a heating plate, a detachable connector, a cable, an insulating tube, a box casing, a dehumidifier, a fan, a controller and a power supply; The sensor module, the detachable connector, the cable and the insulating barrel are located inside the experimental box housing; The monitoring device host, antenna, air humidifier, protective cover, heating plate, dehumidifier, fan, controller and power supply are located outside the experimental box shell; The box-penetrating sleeve is arranged on the inner side and the outer side of the shell of the test box; One end of the insulating tube is fixed to the lower end surface of the test box shell, the other end of the insulating tube is connected to one end of the cable, the other end of the cable is connected to one end of the detachable connector, the other end of the detachable connector is connected to one end of the box-penetrating sleeve located inside the test box shell, and the high-voltage access point at the other end of the box-penetrating sleeve is located outside the test box shell and is connected to a high-voltage adjustable power supply; A casing shielding ring is provided on the casing through the box, and a casing shielding ring interface is provided on the casing shielding ring; the casing shielding ring interface is provided at one end of the casing through the box located inside the shell of the experimental box, and a conical partial discharge measuring device bracket is provided on the conductor side of the casing shielding ring close to the casing through the box; In the length direction of the casing, the lengths of the casing shielding ring and the partial discharge measuring device bracket are h and h1 respectively, 4≤h / h1; A partial discharge measuring device is arranged at the end of the partial discharge measuring device bracket, and the partial discharge measuring device is connected to the monitoring device host through a cable. A hole is opened from the end to the bottom of the partial discharge measuring device bracket, and the cable is laid in the hole; There are multiple partial discharge measuring device brackets, which are arranged on the sleeve shielding ring along the circumferential direction; One or more grooves are provided on the side of the partial discharge measuring device bracket, and a partial discharge point gas sensor is arranged in the groove, and the partial discharge point gas sensor is connected to the monitoring device host through a cable; A gap is provided between the partial discharge measuring device and the groove, and the gap is less than 0.8h1; The length of at least one partial discharge measuring device bracket among the plurality of partial discharge measuring device brackets along the length direction of the box-penetrating sleeve is smaller than the average length of the plurality of partial discharge measuring device brackets along the box-penetrating sleeve; The test box housing, detachable connector, cable, insulation tube and box bushing constitute an insulation fault simulation unit; The monitoring device host, antenna, air humidifier, protective cover, heating plate, dehumidifier, fan, controller and power supply constitute the environmental parameter simulation unit; The monitoring device host, antenna, sensor module and power supply constitute an online monitoring unit.

2. The experimental device according to claim 1, characterized in that: The host and antenna of the monitoring device are fixed on the upper end of the experimental box shell, the protective cover and the heating plate are fixed on the front of the experimental box shell, and the air humidifier, dehumidifier, fan, controller and power supply are fixed on the side of the experimental box shell.

3. The experimental device according to claim 1, characterized in that: The monitoring data signal of the monitoring device host is transmitted through the antenna and uploaded to the server through the network. The data platform counts and displays the data. At the same time, the data platform performs reverse control and parameter setting on the host.

4. The experimental device according to claim 1, characterized in that: The experimental device sets different matching and installation methods between the detachable connector and the sleeve, and can simulate insulation failures that at least include the detachable connector being not properly assembled, the stress cone of the detachable connector being disengaged, the presence of metal foreign matter between the sleeve and the detachable connector, the presence of metal foreign matter between the insulating plug and the detachable connector, the presence of depressions on the surface of the sleeve, and the presence of depressions on the inner surface of the detachable connector.

5. The experimental device according to claim 1, characterized in that: The A, B, and C three-phase partial discharge test interfaces of the monitoring device host use coaxial cables to connect the partial discharge signals on the A, B, and C three-phase box-penetrating bushing shielding ring interfaces respectively for partial discharge monitoring.

6. The experimental device according to claim 1, characterized in that: The host of the monitoring device sends instructions to the controller, and the controller comprehensively controls the air humidifier, heating plate, dehumidifier and fan to work together to complete the regulation of the internal environmental parameters of the test chamber.

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