CN217738467U - Fault detection device for lightning arrester - Google Patents

Fault detection device for lightning arrester Download PDF

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Publication number
CN217738467U
CN217738467U CN202222122057.1U CN202222122057U CN217738467U CN 217738467 U CN217738467 U CN 217738467U CN 202222122057 U CN202222122057 U CN 202222122057U CN 217738467 U CN217738467 U CN 217738467U
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module
arrester
fault detection
lightning arrester
terminal
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Inventor
姜东飞
唐程
张玉辉
唐邦义
周刚捷
潘以本
潘吟泓
陆玮
蒋子豪
刘小民
李泽锋
魏恒
王玉强
朱金康
王正武
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Jiaxing Dasong Intelligent Technology Co ltd
Super High Voltage Branch Of State Grid Xinjiang Electric Power Co ltd
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Jiaxing Dasong Intelligent Technology Co ltd
Maintenance Company State Grid Xinjiang Electric Power Co
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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Abstract

The utility model discloses a fault detection equipment for arrester, including fault detection terminal and detection analysis terminal, fault detection terminal is used for obtaining the working parameter of arrester, and the working parameter includes the actual operating temperature of arrester, and wherein fault detection terminal includes infrared acquisition module, MCU module and wireless transmitting module, and infrared acquisition module, MCU module and wireless transmitting module are connected electrically in proper order; the detection and analysis terminal is used for judging the working state of the lightning arrester according to the working parameters of the lightning arrester and comprises a wireless receiving module, a data processing module and a storage module, the wireless sending end is in communication connection with the wireless receiving end, and the data processing module is connected with the wireless receiving end and the storage module. This openly can be through the operating condition of thermal infrared imaging monitoring arrester, in time through the fault condition of the inside thermal imaging discovery arrester of arrester, need not artifical reconnaissance to the scene, whether accessible automated inspection arrester is in fault condition.

Description

Fault detection device for lightning arrester
Technical Field
The utility model relates to a check out test set, especially a fault detection equipment for arrester.
Background
The lightning arrester is often subjected to temperature rise abnormality or partial discharge under a continuous operation voltage after being internally damped due to the reduction of sealing performance or the reduction of insulation performance due to the aging of a valve sheet. The performance of the arrester is further reduced due to abnormal temperature rise or partial discharge, so that the arrester fails, the protection effect on the electric power system is lost, and the safety of the electric power system is damaged. Therefore, the lightning arrester needs to be inspected on site regularly to ensure good performance and stable operation of the lightning arrester.
The traditional inspection method comprises the steps of manually observing the appearance of the lightning arrester on site, detecting the temperature distribution of the lightning arrester through an infrared imager, detecting the partial discharge of the lightning arrester through an ultraviolet imaging or ultrasonic method and the like. Partial discharge on the surface of the lightning arrester can be detected by the partial discharge detection ultraviolet imager, the precision is high, but the internal discharge cannot be detected, and the manual judgment often causes misjudgment.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to provide a fault detection equipment for arrester in order to overcome the artifical defect that is difficult to the judgement of arrester internal fault among the prior art.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
the fault detection device for the lightning arrester comprises a fault detection terminal and a detection analysis terminal, wherein the fault detection terminal is used for obtaining working parameters of the lightning arrester, the working parameters comprise the actual working temperature of the lightning arrester, the fault detection terminal comprises an infrared acquisition module, an MCU (micro controller Unit Microcontroller) module and a wireless transmission module, and the infrared acquisition module, the MCU module and the wireless transmission module are sequentially and electrically connected;
the detection and analysis terminal is used for judging the working state of the arrester according to the working parameters of the arrester, and comprises a wireless receiving module, a data processing module and a storage module, wherein the wireless sending module is in communication connection with the wireless receiving module, and the data processing module is electrically connected with a wireless receiving end and the storage module.
Preferably, the fault detection terminal further comprises a very high frequency module and/or a high frequency current module electrically connected with the MCU module;
the ultrahigh frequency module and the high-frequency current module are used for acquiring partial discharge parameters of the lightning arrester.
Preferably, the fault detection terminal comprises a housing, the MCU module and the wireless transmission module are disposed in the housing, and the housing comprises a shielding layer for shielding high-voltage electromagnetic interference.
Preferably, the shielding layer comprises wires arranged in an equidistant grid, the wire diameter is 0.45mm, and the mesh size is 3mm by 3mm.
The utility model discloses an actively advance the effect and lie in: can be through the operating condition of thermal infrared imaging monitoring arrester, in time discover the fault condition of arrester through the inside thermal imaging of arrester, need not artifical reconnaissance to the scene, whether accessible automated inspection arrester is in the fault condition.
Drawings
Fig. 1 is a flowchart of a fault detection method for an arrester according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram illustrating the maximum value of the surface temperature rise of the metal oxide arrester under different environmental temperatures and different defective heat source powers in embodiment 1 of the present invention;
fig. 3 is a schematic diagram illustrating the maximum value of the internal temperature rise of the metal oxide arrester according to different environmental temperatures and different defective heat source powers in embodiment 1 of the present invention;
fig. 4 is a schematic block diagram of a fault detection system for an arrester according to embodiment 2 of the present invention;
fig. 5 is a schematic structural diagram 1 of a fault detection device for an arrester according to embodiment 3 of the present invention;
fig. 6 is a schematic structural diagram 2 of a fault detection device for an arrester according to embodiment 3 of the present invention.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a fault detection method for an arrester, as shown in fig. 1, the fault detection method includes:
s101, acquiring the power of the lightning arrester and the ambient temperature;
s102, acquiring a thermal infrared image of the lightning arrester, and acquiring the temperature inside the lightning arrester according to the thermal infrared image;
s103, judging whether the temperature difference between the internal temperature of the lightning arrester and the ambient temperature is greater than a preset temperature threshold value of corresponding power;
and S104, if so, determining that the lightning arrester is in a fault state.
As an implementation manner, the preset temperature threshold is based on a maximum temperature rise value of the arrester temperature rise simulation model, and the establishing method of the arrester temperature rise simulation model includes:
determining a control equation and boundary conditions of the model;
wherein the governing equation comprises:
conservation of mass equation:
Figure 39517DEST_PATH_IMAGE001
；
the conservation of momentum equation:
Figure DEST_PATH_IMAGE002
energy conservation equation:
Figure 18974DEST_PATH_IMAGE003
solid heat transfer control equation:
Figure DEST_PATH_IMAGE004
wherein rho, cp and k are distributed as the density, specific heat capacity and thermal conductivity of the corresponding gas or solid material; u is a velocity vector; p is the gas pressure; μ is aerodynamic viscosity; g is gravity acceleration; Δ ρ is the density difference due to thermal expansion of the gas; i is an identity matrix; q is the volumetric heat;
the interface of gas and solid adopts the boundary of not slipping, and natural convection and the heat radiation of air are only considered to the casing outside, and the boundary condition is the constant temperature boundary condition:
Figure 798711DEST_PATH_IMAGE005
the lightning arrester radiation boundary is:
Figure DEST_PATH_IMAGE006
in the formula, epsilon is the surface emissivity of the lightning arrester; qr is total heat flux of surface inflow radiation heat exchange; j is the outflow radiant heat flux; g is the surface incident radiant heat flux; σ is Stefan-Boltzmann constant;
the characteristic dimension of the lightning arrester which determines the surface air convection heat transfer coefficient is the length of the lightning arrester in a vertical installation mode, and the lightning arrester is longer, so that the heat transfer coefficient of each point along the axial surface of the lightning arrester is greatly changed. It must be described in terms of local heat transfer coefficient:
the local heat transfer coefficient is:
Figure 256237DEST_PATH_IMAGE007
in the formula (I), the compound is shown in the specification,
Figure DEST_PATH_IMAGE008
in order to have a local heat transfer coefficient,
Figure 70610DEST_PATH_IMAGE009
local expression for the Shert's criterion [2 ]]，
Figure DEST_PATH_IMAGE010
The heat conductivity is adopted, and X is the boundary layer coordinate of the vertical wall heat exchange surface of the lightning arrester;
based on the model, carrying out multi-physical field coupling solving on the internal heating fault of the lightning arrester in a COMSOL Multiphysics simulation environment, wherein voltage, environment temperature and material boundary conditions are applied, and a result is divided through finite element meshes;
and processing and analyzing the finite element meshing result to obtain the corresponding maximum temperature rise value of the lightning arrester under each power at the corresponding environment temperature.
The lightning arrester structure comprises an upper cover plate, a lower cover plate, a ceramic outer sleeve, an insulating sleeve, a stud guide rod, a spring equivalent cylinder, an aluminum gasket, a zinc oxide resistance card and an insulating penetrating rod. Wherein for simplifying the model, a spring equivalent cylinder is used to replace the spring.
The heat dissipation of the metal oxide lightning arrester mainly comprises conductor and shell solid heat transfer, internal gas heat transfer, external air natural convection heat dissipation and lightning arrester surface heat radiation. The heat transfer process of the metal oxide lightning arrester relates to the multi-physical field coupling theory of an electric field, a temperature field and the like.
Take the high-voltage terminal voltage of the metal oxide arrester as 124.5kV as an example. The lightning arrester is vertically installed, the radius of the lightning arrester is far smaller than the length of the lightning arrester, so that the surface convection heat transfer coefficient is increased from the upper end to the bottom, and the surface emissivity of the SiC material is 0.9. The environmental temperature T0 is-30 deg.C, -20 deg.C, -10 deg.C, 0 deg.C, 10 deg.C, 20 deg.C, 30 deg.C, 40 deg.C, and the power of the heat source for the defect in the lightning arrester is 0, 50W, 100W, 150W, and 200W. The internal defect of the lightning arrester often occurs between the zinc oxide resistance card and the insulating sleeve, so that a defect heat source is arranged inside the lightning arrester, and the lightning arrester is subjected to finite element calculation meshing.
The maximum temperature rise of the surface of the metal oxide arrester is influenced by the environment temperature, the environment temperature is 0 ℃, the power of a defect heat source is 100W, the calculation result of the surface temperature of the metal oxide arrester is obtained, and the highest point of the surface temperature of the arrester is located at the upper metal cover plate.
Changing the environmental temperature and the power of a defect heat source, and calculating the maximum value of the surface temperature rise of the metal oxide arrester under different environmental temperatures and heat source powers, as shown in table 1:
Figure 893072DEST_PATH_IMAGE011
as shown in fig. 2, when the power of the defective heat source is constant, the maximum value of the temperature rise on the surface of the arrester is smaller as the ambient temperature is higher. Therefore, the maximum value of the surface temperature rise of the lightning arrester is related to the environmental temperature factor, and the lower the environmental temperature is, the larger the maximum value of the surface temperature rise is, the more obvious the temperature change is, and the lightning arrester can be detected by the infrared thermometer more easily.
The maximum temperature rise inside the metal oxide arrester is influenced by the environment temperature, taking the environment temperature as 0 ℃ and the power of a defective heat source as 100W as an example, and the highest point of the temperature inside the arrester is located at a fault heat source.
Changing the ambient temperature and the power of the defect heat source, and calculating the maximum value of the internal temperature rise of the metal oxide arrester under different ambient temperatures and heat source powers, as shown in table 2:
Figure DEST_PATH_IMAGE012
as shown in fig. 3, when the power of the defect heat source is small, the maximum value of the internal temperature rise of the arrester is not obvious along with the change of the environmental temperature; when the power of the defect heat source is larger, the higher the ambient temperature is, the higher the maximum value of the temperature rise in the lightning arrester is. The reason is that when the ambient temperature is higher, the heat generated by the heat source cannot be conducted out in time compared with the low-temperature environment, so that the heat is accumulated in the defective heat source area to form higher temperature rise. The maximum value of the temperature rise inside the arrester increases with the increase of the ambient temperature.
As an implementable manner, the fault detection method further comprises:
and detecting the lightning arrester by a high-frequency pulse current method, an ultrahigh frequency method and/or an ultrasonic method, and judging whether the lightning arrester is in a fault state in an auxiliary manner.
According to the fault detection method for the arrester, the working state of the arrester can be monitored through thermal infrared imaging, the fault state of the arrester can be found through thermal imaging inside the arrester in time, manual investigation to a field is not needed, and whether the arrester is in the fault state or not can be automatically detected through the fault detection method. And whether the lightning arrester is in a fault state is rechecked in an auxiliary way by a high-frequency pulse current method, an ultrahigh frequency method and/or an ultrasonic wave method so as to improve the detection accuracy.
Example 2
The present embodiment provides a fault detection system 200 for a lightning arrester, as shown in fig. 4, the fault detection system including:
the monitoring module 201 is used for acquiring the power of the lightning arrester and the ambient temperature;
the thermal imaging conversion module 202 is configured to obtain a thermal infrared image of the lightning arrester, and obtain a temperature inside the lightning arrester according to the thermal infrared image;
the judgment module is used for judging whether the temperature difference between the internal temperature of the lightning arrester and the environmental temperature is greater than a preset temperature threshold value or not, and if so, determining that the lightning arrester is in a fault state;
and the storage module is used for storing the preset temperature threshold.
As an implementation manner, the preset temperature threshold value is based on a maximum temperature rise value of the arrester temperature rise simulation model.
The method for establishing the lightning arrester temperature rise simulation model comprises the following steps:
determining a control equation and boundary conditions of the model;
wherein the governing equation comprises:
conservation of mass equation:
Figure 222422DEST_PATH_IMAGE013
；
the conservation of momentum equation:
Figure DEST_PATH_IMAGE014
energy conservation equation:
Figure 421322DEST_PATH_IMAGE015
solid heat transfer control equation:
Figure DEST_PATH_IMAGE016
wherein rho, cp and k are distributed as the density, specific heat capacity and thermal conductivity of the corresponding gas or solid material; u is a velocity vector; p is the gas pressure; μ is aerodynamic viscosity; g is gravity acceleration; Δ ρ is the density difference due to thermal expansion of the gas; i is an identity matrix; q is the volumetric heat;
the gas and solid interface adopts a non-slip boundary, the natural convection and the heat radiation of air are only considered outside the shell, and the boundary condition is a constant temperature boundary condition:
Figure 90201DEST_PATH_IMAGE017
the lightning arrester radiation boundary is:
Figure DEST_PATH_IMAGE018
in the formula, epsilon is the surface emissivity of the lightning arrester; qr is total heat flux of surface inflow radiation heat exchange; j is the effluent radiant heat flux; g is the surface incident radiant heat flux; sigma is Stefan-Boltzmann constant;
the characteristic dimension of the lightning arrester which determines the surface air convection heat transfer coefficient is the length of the lightning arrester in a vertical installation mode, and the lightning arrester is longer, so that the heat transfer coefficient of each point along the axial surface of the lightning arrester is greatly changed. It must be described in terms of local heat transfer coefficient:
the local heat transfer coefficient is:
Figure 145882DEST_PATH_IMAGE019
in the formula (I), the compound is shown in the specification,
Figure 900211DEST_PATH_IMAGE008
in order to have a local heat transfer coefficient,
Figure DEST_PATH_IMAGE020
local expression for the Shert criterion [2]，
Figure 637223DEST_PATH_IMAGE010
The heat conductivity is adopted, and X is the boundary layer coordinate of the vertical wall heat exchange surface of the lightning arrester;
based on the model, carrying out multi-physics coupling solving on the internal heating fault of the lightning arrester in COMSOL Multiphysics, wherein the boundary conditions of voltage, ambient temperature and materials are applied, and the result is divided through finite element gridding;
and processing and analyzing the finite element meshing result to obtain the corresponding maximum temperature rise value of the lightning arrester under each power at the corresponding environment temperature.
As an implementation manner, the fault detection apparatus further includes: the high-frequency pulse current module, the ultrahigh-frequency module and/or the ultrasonic module are used for detecting the lightning arrester and assisting in judging whether the lightning arrester is in a fault state or not.
The fault detection system of arrester that this embodiment provided can be through the operating condition of thermal infrared imaging monitoring arrester, in time discovers the fault condition of arrester through the inside thermal imaging of arrester, need not artifical reconnaissance to the scene, and whether accessible automated inspection arrester is in the fault condition. And whether the lightning arrester is in a fault state is rechecked in an auxiliary way by a high-frequency pulse current method, an ultrahigh frequency method and/or an ultrasonic wave method so as to improve the detection accuracy.
Example 3
The embodiment provides a fault detection device for an arrester, which comprises a fault detection terminal and a detection analysis terminal, wherein the fault detection terminal is used for acquiring working parameters of the arrester, the working parameters comprise the actual working temperature of the arrester, the fault detection terminal comprises an infrared acquisition module 1, an MCU (micro controller Unit Microcontroller) module 2 and a wireless transmission module 3, and the infrared acquisition module 1, the MCU module 2 and the wireless transmission module 3 are electrically connected in sequence;
in one embodiment, the fault detection terminal further comprises a display module 4, the display module 4 is electrically connected with the MCU module 2, and the display module is used for displaying the infrared imaging of the lightning arrester obtained by the infrared acquisition module 1 in real time and the actual working temperature of the lightning arrester corresponding to the infrared imaging.
The detection and analysis terminal is used for judging the working state of the arrester according to the working parameters of the arrester, the detection and analysis terminal comprises a wireless receiving module 5, a data processing module 6 and a storage module 7, the wireless sending module 3 is in communication connection with the wireless receiving module 5, and the data processing module 6 is electrically connected with the wireless receiving end 5 and the storage module 7.
As an implementation manner, the fault detection terminal further comprises an ultrahigh frequency module and/or a high frequency current module electrically connected with the MCU module;
the ultrahigh frequency module and the high-frequency current module are used for acquiring partial discharge parameters of the lightning arrester.
As an implementation manner, as shown in fig. 6, the fault detection terminal includes a housing, the MCU module 2 and the wireless transmission module 3 are disposed in the housing 8, the housing 8 includes a shielding layer 9, and the shielding layer 9 is used for shielding high-voltage electromagnetic interference.
In one embodiment, the display module 4 is exposed on the housing 8, and operation keys electrically connected to the MCU module 2 are disposed on the housing 8. As an implementation manner, the display module 4 may be a touch display terminal, and is used for implementing the practicability of the human-computer interaction interface. An interface 11 is arranged at one end of the housing 8 for electrically connecting the infrared acquisition module 1, and the uhf module and/or the hf current module.
As an implementation manner, the shielding layer 9 includes the wires 10 arranged in a grid at equal intervals, the wire diameter is 0.45mm, and the mesh size is 3mm by 3mm. The conducting wire can be made of conducting materials such as copper wires.
The fault detection equipment for the arrester provided by the embodiment can monitor the working state of the arrester through the thermal infrared imaging of the fault detection terminal, finds the fault state of the arrester through the thermal imaging inside the arrester in time, does not need manual work to carry out on-site investigation, and can automatically detect whether the arrester is in the fault state or not through the fault detection terminal.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (4)

1. The fault detection equipment for the lightning arrester is characterized by comprising a fault detection terminal and a detection analysis terminal, wherein the fault detection terminal is used for acquiring working parameters of the lightning arrester, the working parameters comprise the actual working temperature of the lightning arrester, the fault detection terminal comprises an infrared acquisition module, an MCU module and a wireless transmission module, and the infrared acquisition module, the MCU module and the wireless transmission module are electrically connected in sequence;
the detection and analysis terminal is used for judging the working state of the arrester according to the working parameters of the arrester, the detection and analysis terminal comprises a wireless receiving module, a data processing module and a storage module, the wireless sending end is in communication connection with the wireless receiving end, and the data processing module is connected with the wireless receiving end and the storage module.
2. The fault detection device for the surge arrester according to claim 1, wherein the fault detection terminal further comprises a very high frequency module and/or a high frequency current module electrically connected to the MCU module;
the ultrahigh frequency module and the high frequency current module are used for acquiring partial discharge parameters of the lightning arrester.
3. The fault detection device for the lightning arrester according to claim 1, wherein the fault detection terminal comprises a housing, the MCU module and the wireless transmission module are disposed within the housing, and the housing comprises a shielding layer for shielding high voltage electromagnetic interference.
4. The fault detection device for a surge arrester of claim 3, wherein the shielding layer comprises wires arranged in a grid with an equal spacing, the wire diameter is 0.45mm, and the mesh size is 3mm by 3mm.
CN202222122057.1U 2022-08-12 2022-08-12 Fault detection device for lightning arrester Active CN217738467U (en)

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Address after: 830000 No.5 Jianshe Road, Tianshan District, Urumqi, Xinjiang Uygur Autonomous Region

Patentee after: Super high voltage branch of State Grid Xinjiang Electric Power Co.,Ltd.

Patentee after: JIAXING DASONG INTELLIGENT TECHNOLOGY Co.,Ltd.

Address before: 830000 123 Jianshe Road, Tianshan District, Urumqi, Xinjiang Uygur Autonomous Region

Patentee before: MAINTENANCE COMPANY, STATE GRID XINJIANG ELECTRIC POWER Co.

Patentee before: JIAXING DASONG INTELLIGENT TECHNOLOGY Co.,Ltd.

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