CN216622644U - Lightning arrester detection device and system - Google Patents
Lightning arrester detection device and system Download PDFInfo
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- CN216622644U CN216622644U CN202220552689.9U CN202220552689U CN216622644U CN 216622644 U CN216622644 U CN 216622644U CN 202220552689 U CN202220552689 U CN 202220552689U CN 216622644 U CN216622644 U CN 216622644U
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Abstract
The application provides a lightning arrester detection device and system, wherein the device includes: the device comprises a signal input terminal, a grounding terminal, a battery module, a clock module, a miniature relay, a power supply module, a central processing unit, a GPS (global positioning system) time service module, a data storage unit, a communication module, an AD (analog-digital) sampling unit, a micro-current sensor and a relay; the signal input terminal is connected with the micro-current sensor through a relay, the micro-current sensor is respectively connected with the grounding terminal and the central processing unit, and the central processing unit is respectively connected with the power supply module, the GPS time service module, the data storage unit, the communication module, the clock module and the AD sampling unit; the power module is connected with the clock module and the battery module through the miniature relay, the battery module is connected with the clock module, and the micro-current sensor is connected with the AD sampling unit. The lightning arrester detection device and the lightning arrester detection system are simple and convenient to install and maintain, and can realize low-power-consumption live detection and online monitoring.
Description
Technical Field
The application relates to a detection device in the power industry, in particular to a lightning arrester detection device and system.
Background
The lightning arrester is used as an overvoltage protection device, and the operation state of the lightning arrester is very important for safe and reliable operation of a power system and personnel safety guarantee. The lightning arrester bears the system operation voltage and short-time overvoltage for a long time, is different from high-voltage equipment insulation, and the factors influencing the state of the lightning arrester are active loss including damp and resistance card active loss. The resistive current detection of the lightning arrester is divided into two forms of periodic live test and on-line monitoring.
The preventive test is a main link of the operation and maintenance of the arrester, and the power industry standard DL/T596-1996 'preventive test procedure for power equipment' defines the power failure preventive test items, periods and requirements of the arrester, and is always a main means of the operation and maintenance of the arrester. The lightning arrester power failure direct current leakage current test is very sensitive and effective for finding early defects of the lightning arrester, but has the defects of low efficiency, high cost and more prominent contradiction with the requirements of high-speed development of a power grid and power supply reliability in a periodic power failure preventive test. With the maturity of the electric test technology of the gapless metal oxide arrester, the technical means of replacing the power failure direct current leakage current test is provided, and the southern power grid enterprise standard Q/CSG114002-2011 'preventive test procedure for power equipment' combines the electric test and the infrared thermal imaging detection as the main means of the preventive test of the arrester.
The equivalent circuit for detecting the leakage current of the lightning arrester is shown in fig. 4, wherein C is the stray capacitance of the lightning arrester to the ground, R is the nonlinear resistance of the zinc oxide resistor disc of the lightning arrester, Ic is the capacitive current caused by the stray capacitance, and IR is the resistive current caused by the nonlinear resistance of the zinc oxide resistor disc of the lightning arrester. The total earth leakage current (hereinafter referred to as "total current") It of the lightning arrester is formed by superposing resistive leakage current and capacitive leakage current:
It＝Ic+IR
the capacitive current is less influenced by the running state of the lightning arrester, and the running state of the resistive current lightning arrester is closely related to reflect the active loss of the resistor disc and the internal insulation of the lightning arrester, so that the capacitive current is a main index for evaluating the running state of the lightning arrester.
Since the capacitive current Ic is much larger than the resistive current IR, the variation of the resistive current is difficult to accurately reflect from the amplitude of the full current It, and therefore, the operating state of the lightning arrester cannot be effectively obtained. Therefore, capacitive current and resistive current need to be decoupled, and a mainstream method for solving the problem at present is a capacitive current compensation method (or called as a phase voltage compensation method), which needs to additionally measure a voltage signal applied to the arrester, phase-shift the voltage signal by 90 degrees and adjust the amplitude to obtain an equivalent capacitive current, deduct the capacitive component from a full current signal to obtain a resistive current component, and obtain potential defects such as internal moisture of the arrester, aging of a resistor disc and the like according to the change of the resistive current component.
The capacitive current compensation method needs to synchronously extract the secondary signal of a voltage transformer (PT) on site, and the PT secondary signal is generally led to a lightning arrester test point through a signal wire of tens of meters on site. The method brings great potential safety hazard, and accidents caused by PT secondary short circuit can be caused; and because there is very strong electromagnetic interference in the high-voltage substation scene, very long PT secondary signal line receives the phase place skew that leads to the interference easily to lead to the measuring result error very big.
The traditional mechanical arrester counter (monitoring device) can only monitor the total current and the action times of the arrester, the mechanical counter counts the number of the circulating jumps, a pointer type ammeter is used for indicating the total current of the arrester, the resistance current of the arrester concerned by people cannot be reflected, the specific action time of the arrester cannot be reflected, and effective information cannot be provided for the fault analysis of a transformer substation.
In addition, at present, an electronic lightning arrester on-line monitoring device is installed in a part of substations, a high-voltage primary loop needs to be transformed on site, a connecting line between a lightning arrester body and a counter needs to be disconnected, the monitoring device is connected into a system in series, and the lightning arrester on-line monitoring device can be installed generally only when power is cut off in order to guarantee safety. Under the background that the power supply reliability requirement is higher and the power failure time is shorter and shorter, the monitoring device and the high-voltage system form a 'hard connection' relationship, and great inconvenience exists in both installation and subsequent updating, maintenance and repair.
In addition, the existing online lightning arrester monitoring device has large overall power consumption, and a special power supply power line, a special PT signal line and a special communication line need to be arranged in a total station range. The field wiring and construction workload is large, the cost is high, and the influence of the field interference environment causes low reliability of measured data, high failure rate and incapability of obtaining accurate earth resistance current results, so that the problems of erroneous judgment and missed judgment often occur, and the effectiveness of monitoring the state of the lightning arrester is influenced.
Therefore, a technical solution is needed to solve the problems of a lot of field wiring, high installation and maintenance costs, and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a lightning arrester detection device and a lightning arrester detection system. An arrester testing device comprising:
the device comprises a signal input terminal, a grounding terminal, a battery module, a clock module, a miniature relay, a power supply module, a central processing unit, a GPS (global positioning system) time service module, a data storage unit, a communication module, an AD (analog-digital) sampling unit, a micro-current sensor and a relay;
the signal input terminal is connected with the micro-current sensor through the relay, the micro-current sensor is respectively connected with the grounding terminal and the central processing unit, and the central processing unit is respectively connected with the power supply module, the GPS time service module, the data storage unit, the communication module, the clock module and the AD sampling unit; the power module passes through miniature relay with clock module with battery module connects, battery module with clock module connects, little current sensor with AD sampling unit connects.
In some embodiments, further comprising:
and the power supply module is connected with the battery module and used for supplying power to the battery module.
In some embodiments, the power supply module comprises a solar module and/or a leakage current energy-taking module.
In some embodiments, the device further comprises a manual wake-up module and an action detection module, wherein the manual wake-up module is respectively connected with the power supply module and the micro relay, and the action detection module is respectively connected with the signal input terminal, the clock module and the central processor module;
the manual awakening module is used for awakening the lightning arrester detection device manually, and the action detection module is used for detecting lightning stroke actions.
In some embodiments, the device further comprises an isolated voltage transformer, wherein the isolated voltage transformer and the AD sampling unit are used for secondarily outputting the electric signal collected by the AD sampling unit.
In some embodiments, the communication module comprises a short-range communication module.
In some embodiments, the communication module further comprises a long-range communication module.
An arrester detection system comprising: a plurality of lightning arrester detection devices according to the first four preceding claims, further comprising isolated voltage transformers, wherein the AD sampling units of the plurality of lightning arrester detection devices are respectively connected to the isolated voltage transformers, and the isolated voltage transformers respectively output the electrical signals collected by different AD sampling units.
The lightning arrester detection device and the lightning arrester detection system are simple and convenient to install and maintain, and can realize low-power-consumption live detection and online monitoring.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural view of a lightning arrester detection device according to a first embodiment of the utility model;
fig. 2 is a schematic structural view of a lightning arrester detection device according to a second embodiment of the utility model;
fig. 3 is a schematic structural view of a lightning arrester detecting system according to a third embodiment of the present invention;
fig. 4 is a schematic diagram of an equivalent circuit for detecting leakage current of the arrester.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the utility model. It should be noted that, for convenience of description, only the relevant portions of the related inventions are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the utility model provides a lightning arrester detection device and system, which are used for detecting electric leakage of a lightning arrester. The lightning arrester detection device comprises a signal input terminal, a grounding terminal, a battery module, a clock module, a miniature relay, a power supply module, a central processing unit, a GPS time service module, a data storage unit, a communication module, an AD sampling unit, a micro-current sensor and a relay;
the signal input terminal is connected with the micro-current sensor through the relay, the micro-current sensor is respectively connected with the grounding terminal and the central processing unit, and the central processing unit is respectively connected with the power supply module, the GPS time service module, the data storage unit, the communication module, the clock module and the AD sampling unit; the power module passes through miniature relay with clock module with battery module connects, battery module with clock module connects, little current sensor with AD sampling unit connects.
The lightning arrester detection device and the lightning arrester detection system are simple and convenient to install and maintain, and can realize low-power-consumption live detection and online monitoring.
Fig. 1 shows a schematic structural diagram of a lightning arrester detection device according to an embodiment of the present invention. As can be seen from fig. 1, the lightning arrester detection device of the present embodiment includes a signal input terminal, a ground terminal, a battery module, a clock module, a micro-relay, a power module, a central processing unit, a GPS time service module, a data storage unit, a communication module, an AD sampling unit, a micro-current sensor, and a relay;
the signal input terminal is connected with the micro-current sensor through the relay, the micro-current sensor is respectively connected with the grounding terminal and the central processing unit, and the central processing unit is respectively connected with the power supply module, the GPS time service module, the data storage unit, the communication module, the clock module and the AD sampling unit; the power module passes through miniature relay with clock module with battery module connects, battery module with clock module connects, little current sensor with AD sampling unit connects.
In addition, the method further comprises the following steps:
and the power supply module is connected with the battery module and used for supplying power to the battery module. Specifically, the power supply module comprises a solar module and/or a leakage current energy-taking module.
The manual wake-up module is respectively connected with the power supply module and the miniature relay, and the action detection module is respectively connected with the signal input terminal, the clock module and the central processor module; the manual awakening module is used for awakening the lightning arrester detection device manually, and the action detection module is used for detecting lightning stroke actions.
In this embodiment, the communication module includes a short-distance communication module, and in some other embodiments, may further include a long-distance communication module.
The lightning arrester detection device and the lightning arrester detection system are simple and convenient to install and maintain, and can realize low-power-consumption live detection and online monitoring.
Fig. 2 is a schematic structural diagram of a lightning arrester detection device according to a second embodiment of the present invention. As an optional embodiment of the present invention, on the basis of the lightning arrester detection apparatus in the above embodiment, the lightning arrester detection apparatus further includes an isolated voltage transformer, where the isolated voltage transformer and the AD sampling unit are used to perform secondary output on the electrical signal collected by the AD sampling unit.
Fig. 3 is a schematic structural diagram of a lightning arrester detection system according to a third embodiment of the present invention. The arrester detecting system of this embodiment includes: a plurality of arrester detection device as in the embodiment one to and, isolated voltage transformer, a plurality of arrester detection device's AD sampling unit respectively with isolated voltage transformer connects, through the signal of telecommunication that different AD sampling unit of isolated voltage transformer output respectively gathered.
The signal input terminal of the lightning arrester detection device is connected with the upper end of a lightning arrester counter (the lower end of a lightning arrester body), and the grounding terminal is grounded. The signal input terminal is also connected with the action detection module and the relay, and the other end of the relay is connected to the grounding terminal after passing through the precise micro-current sensor. The output of the current sensor is connected to the AD sampling unit, and the output of the AD sampling unit is connected to the central processing unit. The central processor is also connected with a GPS time service module, a clock module, a data storage unit, an action detection module, a clock module, a short-distance communication module, a long-distance transmission module and a relay.
The action detection module and the clock module are simultaneously connected with the central processing unit, so that the central processing unit can distinguish whether the action detection module or the clock module is awakened at regular time after being electrified so as to execute different program actions.
The lightning arrester detection device comprises a solar energy or leakage current energy acquisition module, the solar energy or leakage current energy acquisition module is connected with a battery module and used for charging and supplementing energy for a battery, the battery module supplies power for a clock module all the time, the battery module is also connected to a power supply module through a miniature relay switch, and the miniature relay can be triggered to be closed by a manual awakening button, the clock module, an action detection module and a central control processor so as to supply power for all modules at the rear end of the miniature relay.
In a daily standby state of the lightning arrester detection device, only the clock module is electrified, and the standby current is uA level, so that the overall power consumption is extremely low. The battery is connected with the power module through the micro relay contact, the power module supplies power to the central processing unit and all other modules, and the micro relay is in a disconnected state and does not consume electric quantity in normal standby.
The signal input terminal is connected in parallel to the upper end of the current discharge counter and then connected to the grounding terminal through a relay, and the grounding terminal is connected to a grounding grid. The relay is in an open circuit state under normal conditions, so the device is connected in parallel at two ends of the lightning arrester counter, and the discharge counting and full current monitoring functions of the conventional lightning arrester counter are not influenced. When the total current and the resistive current need to be measured at regular time every day, the relay is controlled by the central processing unit to be closed for a few seconds, so that the total current flows from the micro-current sensor in the device.
The signal input terminal is connected with an action detection module, when lightning overvoltage action occurs to the lightning arrester, an instantaneous voltage of dozens of volts to hundreds of volts is generated at the signal input terminal, the action detection module controls the action of the miniature relay by utilizing the energy of the voltage so as to electrify the power supply module, the power supply module is electrified to the central processing unit and other modules after being switched on, the central processing unit outputs a control signal after being electrified to keep the miniature relay closed and continuously supply power, meanwhile, a program records the action of one lightning stroke, acquires accurate time through the clock module, stores the time into the data storage unit, and sends data to the background server in a wired or wireless mode through the remote communication module. After the program is executed, the central processing unit outputs a stop output signal to disconnect the micro relay, so that the power supply module and the central processing unit are powered off.
The central processing unit controls the clock module at the same time, and can set the time for triggering and starting the clock module next time. The clock module triggers an output signal to close the micro relay after reaching the set time, the central processing unit is electrified through the power supply module, the central processing unit starts a program to measure the full-current resistive current, the measured result is stored in the data storage unit, and the data is sent to the background server through the remote communication module in a wired or wireless mode. After the program is executed, the central processing unit outputs a stop output signal to disconnect the micro relay, so that the power supply module and the central processing unit are powered off.
The micro-current sensor is connected with the AD sampling module for digital-to-analog conversion, the output of the AD sampling module is connected with the central processing unit, the central processing unit is connected with the GPS time service module, the GPS time service module can provide nS-level accurate second pulse, the phase difference between the voltage or current waveforms of a plurality of different places and the same accurate second pulse can be realized, and then the relative phase difference between the voltage and current waveforms of different places can be calculated.
In order to save the whole cost and power consumption, a long-distance communication module can be installed on the online monitoring units of part of the lightning arresters or on the main control equipment in the station, and the short-distance communication in the station can be completed through a special short-distance communication module.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. An arrester testing apparatus, comprising:
the device comprises a signal input terminal, a grounding terminal, a battery module, a clock module, a miniature relay, a power supply module, a central processing unit, a GPS (global positioning system) time service module, a data storage unit, a communication module, an AD (analog-digital) sampling unit, a micro-current sensor and a relay;
the signal input terminal is connected with the micro-current sensor through the relay, the micro-current sensor is respectively connected with the grounding terminal and the central processing unit, and the central processing unit is respectively connected with the power supply module, the GPS time service module, the data storage unit, the communication module, the clock module and the AD sampling unit; the power module passes through miniature relay with clock module with battery module connects, battery module with clock module connects, little current sensor with AD sampling unit connects.
2. The lightning arrester detection apparatus according to claim 1, further comprising:
and the power supply module is connected with the battery module and used for supplying power to the battery module.
3. A lightning arrester detection apparatus according to claim 2 wherein the power supply module comprises a solar module and/or a leakage current energy-harvesting module.
4. The lightning arrester detection device according to claim 3, further comprising a manual wake-up module and an action detection module, wherein the manual wake-up module is respectively connected with the power supply module and the micro relay, and the action detection module is respectively connected with the signal input terminal, the clock module and the central processor module;
the manual awakening module is used for awakening the lightning arrester detection device manually, and the action detection module is used for detecting lightning stroke actions.
5. The arrester detection device according to claim 4, further comprising an isolated voltage transformer, wherein the isolated voltage transformer and the AD sampling unit are used for performing secondary output on the electric signal collected by the AD sampling unit.
6. A lightning arrester testing device according to claim 5 wherein the communication module comprises a short range communication module.
7. An arrester testing device according to claim 6 wherein the communication module further comprises a long-range communication module.
8. An arrester testing system, comprising: the lightning arrester detection device according to any one of claims 1 to 4, further comprising an isolation type voltage transformer, wherein the AD sampling units of the lightning arrester detection device are respectively connected with the isolation type voltage transformer, and the AD sampling units respectively output the electric signals collected by different AD sampling units through the isolation type voltage transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220552689.9U CN216622644U (en) | 2022-03-14 | 2022-03-14 | Lightning arrester detection device and system |
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| CN202220552689.9U CN216622644U (en) | 2022-03-14 | 2022-03-14 | Lightning arrester detection device and system |
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| CN216622644U true CN216622644U (en) | 2022-05-27 |
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| CN202220552689.9U Active CN216622644U (en) | 2022-03-14 | 2022-03-14 | Lightning arrester detection device and system |
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