CN-122000826-A - State self-sensing lightning protection equipment, method and system

CN122000826ACN 122000826 ACN122000826 ACN 122000826ACN-122000826-A

Abstract

The invention provides state self-sensing lightning protection equipment, a state self-sensing lightning protection method and a state self-sensing lightning protection system, which comprise a lightning arrester body, a lightning arrester insulation base, a first self-sensing monitoring module integrated in the lightning arrester body, a second self-sensing monitoring module integrated in the lightning arrester insulation base and a communication and control unit, wherein the first self-sensing monitoring module is used for monitoring temperature and humidity information in the lightning arrester body in the operation process of the lightning arrester, the second self-sensing monitoring module is used for monitoring full-working-condition current of the lightning arrester body under the normal operation and the action of internal and external overvoltage, and the communication and control unit is used for analyzing and processing the waveform of the full-working-condition current to determine action information and position information of the lightning arrester and sending the action information and the position information of the lightning arrester, the waveform of the full-working-condition current and the temperature and humidity information to an intranet of a power grid, so that the problems of the operation state monitoring of the existing lightning protection equipment such as insufficient real-time, data isolation, service life assessment loss, low intelligent level and the like are solved.

Inventors

GU SHANQIANG
CAO WEI
XU YUANGEN
FANG YUHE
XIONG YI
ZHAO CHUN
WANG LULU
LI ZHE
LI WEIWEI

Assignees

中国电力科学研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20251217

Claims (16)

1. The state self-perception type lightning protection device is characterized by comprising a lightning arrester body, a lightning arrester insulation base, a first self-perception monitoring module, a second self-perception monitoring module and a communication and control unit, wherein the first self-perception monitoring module is integrated in the lightning arrester body, the second self-perception monitoring module is integrated in the lightning arrester insulation base, and the communication and control unit is respectively connected with the first self-perception monitoring module, the second self-perception monitoring module and an intranet of a power grid; the first self-sensing monitoring module is used for monitoring temperature and humidity information in the lightning arrester body in the operation process of the lightning arrester; The second self-sensing monitoring module is used for monitoring all-condition current of the lightning arrester body under the normal operation and the action of internal and external overvoltage, wherein the all-condition current comprises impulse current, leakage current and follow current, and the internal and external overvoltage comprises lightning overvoltage and operation overvoltage; the communication and control unit is used for analyzing and processing the waveform of the full-working-condition current, determining the action information and the position information of the lightning arrester, and sending the action information and the position information, the waveform of the full-working-condition current and the temperature and humidity information to an intranet of a power grid.
2. The apparatus of claim 1, wherein the second self-sensing monitoring module comprises a current sensing unit, a signal processing unit, and a conductive copper bar; The current sensing unit is used for monitoring the full-working-condition current of the lightning arrester body under the normal operation and the action of internal and external overvoltage; the signal processing unit is connected with the current sensing unit and is used for conditioning the waveform of the all-condition current; And the conductive copper rod penetrates through the second self-sensing monitoring module, two ends of the conductive copper rod are respectively and electrically connected with two ends of the insulation base of the lightning arrester body, and are electrically connected with the circuit pole tower or the transformer substation grounding body through the lower end of the insulation base to form a drainage channel connected with the current sensing unit in parallel.
3. The apparatus of claim 2, wherein the current sensing unit comprises a plurality of current monitoring channels, the current monitoring channels comprising: A first current monitoring channel for monitoring and collecting leakage current of the lightning arrester body, wherein the measured amplitude range comprises [0 muA, 1 mA); the second current monitoring channel is used for monitoring and collecting the follow current of the lightning arrester body, and the measured amplitude range of the second current monitoring channel comprises [1 mA-50A); the third current monitoring channel is used for monitoring and collecting first impulse current passing through the lightning arrester body under the action of internal and external overvoltage, and the amplitude range of the first impulse current comprises [50A-1 kA); And the fourth current monitoring channel is used for monitoring and collecting second impulse current passing through the lightning arrester body under the action of internal and external overvoltage, and the amplitude range of the second impulse current comprises [1kA-100kA ].
4. The apparatus of claim 3, wherein the first current monitoring channel and the second current monitoring channel each comprise a magneto-resistive sensor, wherein the magneto-resistive sensor samples at a first frequency and wherein the waveform recording duration is a first duration; the third current monitoring channel and the fourth current monitoring channel comprise Rogowski coils, the Rogowski coils adopt a second frequency for sampling, and the waveform recording duration is a second duration; wherein the first frequency < the second frequency, the first duration > the second duration.
5. The apparatus of claim 3, wherein the magnetoresistive sensor disposed in the first current monitoring channel comprises: And the magnetic collecting ring is used for enhancing the weak magnetic field and improving the monitoring sensitivity of the magnetic resistance sensor in the first current monitoring channel to weak current.
6. The apparatus of claim 2, wherein the conditioning of the signal processing unit comprises: And amplifying and filtering the waveform of the full-working-condition current to obtain a corresponding digital signal.
7. The apparatus of claim 1, wherein the communication and control unit comprises: The Beidou standard clock sub-unit, the Beidou positioning sub-unit, the control sub-unit and the communication sub-unit are connected with each other; The control subunit is connected with the second self-sensing monitoring module and is used for analyzing and processing the waveform of the all-working-condition current and determining the action of the lightning arrester; The Beidou standard clock subunit is used for recording the action time and action frequency information of the lightning arrester when the lightning arrester acts; the Beidou positioning subunit is used for positioning the position information of the lightning arrester; the communication subunit is further connected with the first self-sensing monitoring module and is used for: And encrypting the waveform of the all-condition current, the action information and the position information of the lightning arrester and the temperature and humidity information, and transmitting the encrypted waveform, the action information and the position information of the lightning arrester and the temperature and humidity information to an intranet of a power grid connected with the safety access gateway through the safety access gateway of the power grid.
8. The state self-perception type lightning protection method is characterized by comprising the following steps of: The communication and control unit of the state self-sensing lightning protection equipment acquires waveforms of all-condition currents of the lightning arrester body under the normal operation and internal and external overvoltage actions according to the second self-sensing monitoring module to determine action information and position information of the lightning arrester; The communication and control unit transmits the temperature and humidity information, the waveform of the full-working-condition current, the action information and the position information of the lightning arrester, which are acquired by the first self-sensing monitoring module, to an intranet of the power grid so as to realize action event authentication, running condition research and judgment and health state evaluation of the lightning arrester; The full-working-condition current comprises impulse current, leakage current and follow current, and the internal and external overvoltage comprises lightning overvoltage and operation overvoltage; the state-self-sensing lightning protection equipment is the state-self-sensing lightning protection equipment according to any one of claims 1 to 7.
9. The method of claim 8, wherein the determining the action information and the position information of the arrester comprises: The control subunit of the communication and control unit analyzes and processes the waveform of the all-condition current to determine the action of the lightning arrester; the Beidou standard clock subunit of the communication and control unit acquires action information when the lightning arrester acts based on the action of the lightning arrester, wherein the action information comprises action time and action frequency information of the lightning arrester; The Beidou positioning subunit of the communication and control unit is used for positioning the position information of the lightning arrester.
10. The method of claim 8, wherein the transmitting, by the communication and control unit, the temperature and humidity information collected by the first self-sensing monitoring module, the waveform of the full-condition current, the lightning arrester action information, and the position information to the intranet of the power grid includes: And the communication subunit of the communication and control unit encrypts the action information and the position information of the lightning arrester and the waveform and the temperature and humidity information of the conditioned full-working-condition current, and transmits the encrypted action information and the position information and the waveform and the temperature and humidity information of the conditioned full-working-condition current to an intranet of a power grid connected with the safety access gateway through the safety access gateway of the power grid.
11. The method of claim 8, wherein the health assessment of the arrester comprises: Extracting current data of a breaking stage of the follow current after the lightning arrester acts in the waveform of the full-working-condition current; Analyzing resistive current components from the current data of the follow current interruption stage through Fourier transformation; and determining the health risk level of the lightning arrester according to the amplitude and waveform characteristics of the resistive current component.
12. The method of claim 8, wherein the act of authenticating the arrester comprises: And carrying out space-time matching and consistency verification on the waveform, the current amplitude, the polarity, the action time of the lightning arrester, the action times and the position information of the lightning arrester and the temperature and humidity information of the all-condition current, the lightning information detected by the lightning positioning system and the lightning stroke information recorded by the transmission line fault diagnosis system so as to confirm the authenticity and the effectiveness of the action of the lightning arrester and evaluate the operation characteristics of the lightning arrester.
13. The method of claim 8, wherein prior to determining the action information and the position information of the arrester, further comprising: And the communication and control unit amplifies and filters the waveform of the full-working-condition current according to the signal processing unit of the second self-sensing monitoring module to obtain a corresponding digital signal.
14. A state self-aware lightning protection system, comprising: The determining module is used for acquiring waveforms of all-condition currents of the lightning arrester body under the normal operation and the action of internal and external overvoltage through the communication and control unit of the state self-sensing lightning protection equipment according to the second self-sensing monitoring module and determining action information and position information of the lightning arrester; and the transmission module is used for transmitting the temperature and humidity information acquired by the first self-sensing monitoring module, the waveform of the full-working-condition current, the action information and the position information of the lightning arrester to the intranet of the power grid through the communication and control unit so as to realize action event authentication, running condition research and judgment and health state evaluation of the lightning arrester.
15. The electronic equipment is characterized by comprising at least one processor and a memory, wherein the memory and the processor are connected through a bus; The memory is used for storing one or more programs; The state self-aware lightning protection method according to any of claims 8 to 13 is implemented when the one or more programs are executed by the at least one processor.
16. A readable storage medium, having stored thereon an execution program, which when executed, implements the state-self-aware lightning protection method according to any of claims 8 to 13.

Description

State self-sensing lightning protection equipment, method and system Technical Field The invention relates to the field of lightning protection of power grids, in particular to state self-sensing lightning protection equipment, a state self-sensing lightning protection method and a state self-sensing lightning protection system. Background In a power system, lightning protection equipment such as a lightning arrester is key equipment for guaranteeing safe and stable operation of a power grid, and is also a foundation for insulation fit of the power system. Various types of lightning arresters such as a line arrester, a station arrester, a high-capacity energy absorbing device and the like are developed for limiting internal and external overvoltage such as lightning overvoltage, operation overvoltage and temporary overvoltage in a power system, and the large-scale application is realized in a power grid, so that the rapid development and the safe operation of the power grid are supported. With the development of a novel power system, the power grid scale is continuously enlarged, the operation environment is increasingly complex, higher requirements are put forward on the lightning arrester, and real-time sensing, accurate evaluation and intelligent early warning on the operation state of the lightning arrester are needed to be realized so as to meet the requirements of intelligent and lean operation and maintenance of the power grid. At present, the existing lightning arrester mainly records the action times through a mechanical action counter or a monitor, and operation and maintenance personnel need to read data in a manual inspection mode before and after a thunderstorm season, so that effective monitoring and evaluating means for the quality of the in-operation lightning arrester are lacking. The real-time performance is insufficient, namely, the action state and the operation parameters of the lightning arrester cannot be mastered in real time, and the rapid state change caused by sudden lightning events is difficult to deal with; the method comprises the steps of (1) data isolation, namely, action records only reflect lightning stroke times, lack of correlation analysis with lightning parameters (such as lightning current amplitude, waveform and the like), incapability of evaluating whether the action characteristics of a lightning arrester are matched with lightning impulse, and (3) service life evaluation, namely, ageing state and residual service life of the lightning arrester can be replaced blindly only depending on fixed years, and accurate evaluation means based on actual operation conditions are lacking, so that resource waste or potential safety hazard is easily caused, and (4) the intelligent level is low, namely, the existing lightning arrester action counter with a remote transmission function is mostly required to depend on handheld equipment to download data offline, and the counter cannot be designed and tested synchronously with the lightning arrester due to the adoption of external hanging design, so that the anti-interference capability and high-current impulse tolerance are insufficient, and the counter is difficult to adapt to complex electromagnetic environments. In addition, the monitored data are single, and fusion analysis is not carried out on the monitored data and the data such as a lightning positioning system, a power transmission line distributed fault diagnosis system and the like, so that the accuracy of lightning arrester state evaluation is restricted. In the prior art 1:CN119247017B, an online monitoring and evaluating method for the running state of a zinc oxide arrester is disclosed, and the running state of the zinc oxide arrester is evaluated by obtaining historical use state data (comprising the total number of years of historical use, the total number of times of historical use faults and the corrosion area ratio of a historical use shell) of the zinc oxide arrester, so that the running state evaluating method is an experience-based running state evaluating method. The lightning arrester plays a role in protecting equipment in a voltage limiting and current discharging mode, and the action condition of the lightning arrester can reflect the running state of the lightning arrester. For example, under the action of large lightning current, the action times of the lightning arrester in the service life period is definitely less than the action of small-amplitude lightning current, and the lightning arrester is too simple to judge only according to the action times. In the prior art 2, the self-sensing monitoring unit of the lightning arrester and the lightning arrester realize the acquisition of the action current of the lightning arrester, the data volume is single, the fusion analysis of the data such as a lightning positioning system and the like is not provided, the leakage current monitoring of the lightning arrester in a normal working state and the impact