CN113783174B - Lightning protection and abnormal power transmission line protection method and system - Google Patents
Lightning protection and abnormal power transmission line protection method and system Download PDFInfo
- Publication number
- CN113783174B CN113783174B CN202110985125.4A CN202110985125A CN113783174B CN 113783174 B CN113783174 B CN 113783174B CN 202110985125 A CN202110985125 A CN 202110985125A CN 113783174 B CN113783174 B CN 113783174B
- Authority
- CN
- China
- Prior art keywords
- lightning protection
- protection
- unit
- transmission line
- lightning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 238000012545 processing Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 2
- 208000025274 Lightning injury Diseases 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a lightning protection and abnormal power transmission line protection system, which comprises a lightning protection unit, a detection unit, a power supply adjusting unit, a control unit and an industrial personal computer integrated system, wherein the detection unit is connected with the power supply adjusting unit; the detection unit is respectively connected with the lightning protection unit, the power supply adjusting unit, the control unit and the industrial personal computer integrated system. The system equipment provided by the invention has the advantages of simple structure, low cost and simple protection method, and can detect in real time and accurately start lightning protection, so that the protection of a power transmission line is realized, and the power transmission safety is ensured.
Description
Technical Field
The invention relates to the technical field of transmission line protection, in particular to a method and a system for protecting a lightning protection and abnormal transmission line.
Background
The method is widely applied to the aspects of long-distance power transmission, large-area power grid interconnection, underground cable power transmission and the like. The transmission line is used for carrying the heavy duty of electric energy transmission between the energy source production place and the load center, the transmission distance is long, the operation condition is bad, the failure rate is higher than other parts of the direct current system, and the failure rate accounts for about 50% of the failure of the direct current system. Therefore, the high-performance high-voltage direct-current transmission line protection has important significance for improving the safety and stability of the whole power grid. Therefore, the protection of the power transmission line is not necessary, and particularly, the protection is needed to be prevented and protected in thunderstorm weather so as not to cause serious accidents.
Disclosure of Invention
The invention aims to provide a lightning protection and abnormal transmission line protection method and system, which are used for solving the problems in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: the lightning protection and abnormal power transmission line protection system comprises a lightning protection unit, a detection unit, a power supply adjusting unit, a control unit and an industrial personal computer integrated system; the detection unit is respectively connected with the lightning protection unit, the power supply adjusting unit, the control unit and the industrial personal computer integrated system.
Preferably, in the technical scheme, the lightning protection unit is used for protecting the power transmission line when encountering lightning stroke so as to maintain the normal work of the power transmission line or reduce the damage of the lightning stroke to the power transmission line.
Preferably, in this technical scheme, lightning protection unit, including tertiary lightning protection device and thunder and lightning current sensor, thunder and lightning current is firstly through one-level lightning protection device lightning protection and is released, and rethread power isolation suppressor is back through second grade lightning protection device lightning protection and is released the back output, tertiary lightning protection device with second grade lightning protection device passes through the switch parallelly connected, carries out different lightning protection level selections according to different thunderbolt currents, the N end of one-level lightning protection device is through a gas discharge tube back connection earth connection, the thunder and lightning current sensor cover is located on this earth connection.
Preferably, in this technical scheme, the power supply adjusting unit is configured to modulate a voltage of the power transmission line, so as to provide a working voltage to the detecting unit, the lightning protection unit, the control unit and the industrial personal computer integrated system.
Preferably, in the technical scheme, the detection unit is used for detecting the voltage, the current, the harmonic wave and the surge of the power transmission line in real time, and providing a data basis for the pre-judgment of the control unit and the rechecking of the industrial personal computer integrated system.
Preferably, in the present technical solution, the control unit is configured to compare the detection data of the detection unit with a parameter threshold to perform system working mode pre-judgment, and send a pre-judgment result to the industrial personal computer integrated system for rechecking, or directly control the lightning protection unit to perform transmission line protection.
Preferably, in the present technical solution, the control unit includes a database subunit and a control system;
the database subunit comprises a database module and a parameter management module, wherein the parameter management module is used for setting a voltage threshold value, a current threshold value, a harmonic threshold value and a surge threshold value for starting a protection mode so as to provide the control subsystem with data processing reference;
the data path module is used for storing the data confidence of the protection system.
Preferably, in the present technical solution, the control subsystem includes a data processing module, a load executing module, an alarm control module, and a line recovery module;
the data processing module acquires the detected real-time data information from the database module, acquires a preset parameter threshold from the parameter management module, analyzes and processes the real-time data information and the parameter threshold to generate corresponding digital signals, and sends the digital signals to the load execution module, the alarm control module, the line recovery module or directly transmits the digital signals to the industrial personal computer integrated system.
Another object of the present invention is to provide a protection method of a lightning protection and abnormal transmission line protection system, comprising the steps of:
s10, starting a power supply adjusting unit;
s20, the industrial personal computer integrated system monitors the protection system on line in real time;
s30, judging the line monitoring state to determine whether to enter protection;
s40, the input power supply is closed, and lightning protection and overvoltage protection are started.
Preferably, in the present technical solution, in the step S20, the method includes the following steps:
s21, detecting and sampling the current, the voltage and the harmonic waves of the power transmission line for a plurality of times by the detecting unit;
s22, the control unit prejudges the actual data information detected by the detection unit, and sends a prejudging result to the industrial personal computer integrated system;
s23, the industrial personal computer integrated system rechecks the prejudgment result of the control unit according to the detection data of the detection unit;
s24, judging whether to perform a protection state mode according to the rechecking result.
Compared with the prior art, the invention has the following beneficial effects:
the system equipment provided by the invention has the advantages of simple structure, low cost and simple protection method, and can detect in real time and accurately start lightning protection, so that the protection of a power transmission line is realized, and the power transmission safety is ensured.
Drawings
FIG. 1 is a block diagram of a protection system according to the present invention;
FIG. 2 is a schematic diagram of a control unit according to the present invention;
FIG. 3 is a flowchart of the protection method of the present invention;
FIG. 4 is a flowchart of a monitoring and judging method according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; the same or similar concepts or processes may not be described in detail in some embodiments.
Referring to fig. 1, the protection system for lightning protection and abnormal transmission lines of the present invention includes a lightning protection unit 10, a detection unit 20, a power supply adjusting unit 30, a control unit 40 and an industrial personal computer integrated system 50. The detection unit 20 is connected with the lightning protection unit 10, the power supply adjusting unit 30, the control unit 40 and the industrial personal computer integrated system 50 respectively.
Further, the lightning protection unit 10 is configured to protect the power transmission line when it encounters a lightning strike, so as to maintain the normal operation of the power transmission line or reduce the damage of the lightning strike to the power transmission line. In this embodiment, the lightning protection unit 10 at least includes a three-stage lightning protection device and a lightning current sensor, where lightning current is firstly discharged through the first-stage lightning protection device, then is output through the second-stage lightning protection device after being discharged through the power isolation inhibitor, and the three-stage lightning protection device and the second-stage lightning protection device are connected in parallel through a switch, and different lightning protection levels are selected according to different lightning current. The N end of the primary lightning protection device is connected with a grounding wire through a gas discharge tube, and the lightning current sensor is sleeved on the grounding wire. In addition, the lightning protection unit 10 may alternatively be provided with other means for protecting against lightning strikes.
Further, the power supply adjusting unit 30 is configured to modulate the voltage of the power transmission line to provide the working voltage to the detecting unit 20, the lightning protection unit 10, the control unit 40 and the industrial personal computer integrated system 50. In this embodiment, the power supply adjusting unit 30 at least includes an AD/DA converter, a booster and a voltage stabilizer, where the AD/DA converter is used to convert the voltage of the power transmission line (commercial power) into the voltage used for working of the lightning protection device, the sensor, etc., the booster is used to convert the commercial power into the working voltage required by the industrial personal computer integrated system 50, and the voltage stabilizer is used to stabilize the output voltage of the power supply adjusting unit 30, so as to keep the stable working of the detecting unit 20, the lightning protection unit 10, the control unit 40 and the industrial personal computer integrated system 50, and reduce errors and erroneous judgment.
Further, the detecting unit 20 is configured to detect voltage, current, harmonic wave, surge, etc. of the power transmission line in real time, and provide a data basis for the pre-determination of the control unit 40 and the review of the industrial personal computer integrated system 50. In this embodiment, the detection unit 20 at least includes a voltage detection module, a current detection module, a harmonic detection module, and a surge detection module. The voltage detection module, the current detection module, the harmonic detection module and the surge detection module are realized by adopting the following specific scheme:
the voltage detection module or the current detection module preferably adopts an integrated 24-channel alternating current or voltage data acquisition module, adopts a high-precision current/voltage transformer to realize signal isolation and sensing, adopts a special true effective value measurement chip for signal measurement so as to accurately measure the current/voltage true effective values of various waveforms, and performs data communication based on a standard RS-485 bus interface and a MODBUS-RTU protocol.
The harmonic detection module is a harmonic detector, and particularly performs harmonic measurement by using a Fourier transform method, and performs harmonic analysis on a plurality of periodic waveforms of integer multiples by using the Fourier transform.
The surge detection module can adopt CPLD and AD9240 to carry out the module design of a lightning surge signal detection circuit, the attenuated surge signal is collected through the AD9240 with 14 bits, the digital signal is stored in the SRAM through CPLD coordination control, the SRAM data is read through MCU, the larger value is reserved and then is transmitted to an upper PC, and finally the processed peak value is output.
Further, the control unit 40 is configured to compare the detection data of the detection unit 20 with a parameter threshold to perform system operation mode pre-judgment, and send the pre-judgment result to the industrial personal computer integrated system 50 for review, or directly control the lightning protection unit 10 to perform transmission line protection. In this embodiment, as shown in fig. 2, the control unit 40 at least includes a database subunit 41 and a control system 42, where the database subunit 41 includes a database module 411 and a parameter management module 412, and the parameter management module 412 is configured to provide a voltage threshold, a current threshold, a harmonic threshold, and a surge threshold for setting a startup protection mode to the control subsystem 41 for data processing reference. The datapath module 411 is used to store data confidence of the protection system.
Further, the control subsystem 42 includes a data processing module 421, a load executing module 422, an alarm control module 423, and a line restoration module 424. In operation, the data processing module 421 obtains the detected real-time data information from the database module 411, and simultaneously obtains the preset parameter threshold from the parameter management module 412, analyzes and processes the real-time data information and the parameter threshold to generate a corresponding digital signal, and sends the digital signal to the load executing module 422, the alarm control module 423 or the line recovery module 424, or directly transmits the digital signal to the industrial personal computer integrated system 50. In the process, rules of analysis processing are agreed, data are detected in real time and compared with a threshold value to obtain a comparison difference value, when the comparison difference value is negative, a-1 digital signal is output and directly transmitted to the industrial personal computer integrated system 50, and the existing working state is maintained and lightning protection is not started; when the comparison difference is 0 or positive, a digital signal of 0 is output and directly transmitted to the industrial personal computer integrated system 50 for rechecking, so that lightning protection is indicated to be started, the alarm control module 423 gives an alarm, and the protection circuit of the load execution module 422 is started simultaneously. When the comparison difference changes from positive to negative, the line restoration module 424 is activated, performing line restoration and service.
More specifically, a voltage parameter threshold value of U can be defined 0 The method comprises the steps of carrying out a first treatment on the surface of the The current parameter threshold value is I 0 The method comprises the steps of carrying out a first treatment on the surface of the The surge threshold isWherein V is 0 The rated surge voltage is the rated surge voltage when the system is in a standard working state, and t is the time for rising to the standard reference voltage; the detected real-time voltage parameter is U s The method comprises the steps of carrying out a first treatment on the surface of the The current parameter threshold value is I s The method comprises the steps of carrying out a first treatment on the surface of the The surge threshold value is E s Wherein V is s For surge voltage when the system is in working state, s is real-time of detection, according to the prejudgement rule of the invention, defining control signal output function as F S (Us,Is,Es)，F S (Us, is, es) byThe following formula is expressed:
wherein λ is the surge voltage change rate, a is the maximum peak value of the surge voltage, s is time, |E s || 2,1 The range value of the norm is represented, that is, the calculated change rate requires two numbers to be compared, so that 1-2 periods are defined as the internal surge change rate, the inner product is a range symbol, the singular is an absolute value, and the double number is a norm. When the above formula is used to calculate the definition result, it is necessary to determine whether to start lightning protection according to the set threshold range, for example, when F S (Us, is, es) in the set threshold range:and if the threshold value is not within the set threshold value range, starting the lightning protection.
In addition, the result may be defined by the judgment criteria of the present invention, the judgment logic criteria are as follows:
when U is s ≧U 0 F is then S (Us,Is,Es)＝0；
When I s ≥I 0 F is then S (Us,Is,Es)＝0；
When (when)Then F S (Us,Is,Es)＝0；
When U is s <U 0 F is then S (Us,Is,Es)＝-1；
When I s <I 0 F is then S (Us,Is,Es)＝-1；
When (when)Then F S (Us,Is,Es)＝-1。
Further, the industrial personal computer integrated system 50 is configured to perform accurate monitoring, complete control of the detection unit, the control unit, and the lightning protection unit, and provide the functions of parameter setting, historical data query statistics, fault record query, etc. for the user.
The invention relates to a protection method of a lightning protection and abnormal transmission line protection system, which comprises the following steps:
s10, starting a power supply adjusting unit;
s20, the industrial personal computer integrated system monitors the protection system on line in real time;
s30, judging the line monitoring state to determine whether to enter protection;
s40, the input power supply is closed, and lightning protection and overvoltage protection are started.
Further, the specific process in step S20 includes the following steps:
s21, detecting and sampling the current, the voltage, the harmonic waves and the like of the power transmission line for a plurality of times by the detecting unit;
s22, the control unit prejudges the actual data information detected by the detection unit, and sends a prejudging result to the industrial personal computer integrated system;
specifically, the control unit calculates a comparison difference value according to the comparison of the real-time detection data and the threshold value, and then performs security level pre-judgment according to the comparison difference value, wherein the pre-judgment rule is as follows:
(1) And outputting a-1 digital signal when the comparison difference is negative, and pre-judging to be safe, wherein the current running working state is required to be maintained.
(2) When the comparison difference is 0 or positive, outputting a 0 digital signal, predicting as dangerous, requesting to start a protection mode, and carrying out lightning stroke protection.
More specifically, a voltage parameter threshold value of U can be defined 0 The method comprises the steps of carrying out a first treatment on the surface of the The current parameter threshold value is I 0 The method comprises the steps of carrying out a first treatment on the surface of the The surge threshold isWherein V is 0 The rated surge voltage is the rated surge voltage when the system is in a standard working state, and t is the time for rising to the standard reference voltage; the detected real-time voltage parameter is U s The method comprises the steps of carrying out a first treatment on the surface of the The current parameter threshold value is I s The method comprises the steps of carrying out a first treatment on the surface of the The surge threshold value is E s Wherein V is s For surge voltage when the system is in working state, s is real-time of detection, according to the prejudgement rule of the invention, defining control signal output function as F S (Us, is, es) are:
when U is s ≧U 0 、I s ≥I 0 Or (b)Then F S (Us,Is,Es)＝0；
When U is s <U 0 、I s <I 0 Or (b)Then F S (Us,Is,Es)＝-1；
S23, the industrial personal computer integrated system rechecks the prejudgment result of the control unit according to the detection data of the detection unit;
the industrial personal computer integrated system directly acquires real-time detection data from the detection unit and compares the real-time detection data with a threshold value, a comparison difference value is obtained through calculation, the comparison difference value is compared according to the control unit, the comparison is consistent, the rechecking result is +1, the current prejudgment is carried out by the approval control unit, and the industrial personal computer integrated system controls each unit to execute the current prejudgment working mode. And if the comparison results are inconsistent, collecting detection data for rechecking for three times at intervals of 0.2s respectively, and when two inconsistencies appear in the three times, selecting to start the lightning protection unit to enter a transmission line protection mode.
S24, judging whether to perform a protection state mode according to the rechecking result.
In conclusion, the system equipment provided by the invention has the advantages of simple structure, low cost and simple protection method, and can be used for detecting and accurately starting lightning protection in real time, so that the protection of a power transmission line is realized, and the power transmission safety is ensured.
The component structures, connection relationships, operation principles, and the like, which are not described in the present embodiment, are realized by using the prior art, and a detailed description thereof will not be repeated here.
The present invention also provides a readable storage medium having stored therein a computer program for implementing the methods provided by the various embodiments described above when executed by a processor.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The lightning protection and abnormal power transmission line protection system is characterized by comprising a lightning protection unit, a detection unit, a power supply adjusting unit, a control unit and an industrial personal computer integrated system; the detection unit is respectively connected with the lightning protection unit, the power supply adjusting unit, the control unit and the industrial personal computer integrated system;
the control unit is used for comparing the detection data of the detection unit with a parameter threshold value to conduct system working mode pre-judgment, and sending a pre-judgment result to the industrial personal computer integrated system for rechecking;
the control unit comprises a database sub-unit and a control sub-system;
the database subunit comprises a database module and a parameter management module, wherein the parameter management module is used for setting a voltage threshold value, a current threshold value, a harmonic threshold value and a surge threshold value for starting a protection mode so as to provide the control subsystem with data processing reference;
the database module is used for storing data information of the protection system;
the control subsystem comprises a data processing module, a load execution module, an alarm control module and a line recovery module;
the data processing module acquires the detected real-time data information from the database module, acquires a preset parameter threshold from the parameter management module, analyzes and processes the real-time data information and the parameter threshold to generate corresponding digital signals, and sends the digital signals to the load execution module, the alarm control module, the line recovery module or directly transmits the digital signals to the industrial personal computer integrated system.
2. The lightning protection and anomaly transmission line protection system of claim 1, wherein the lightning protection unit is configured to protect the transmission line when it encounters a lightning strike, so as to maintain normal operation of the transmission line or reduce damage to the transmission line caused by the lightning strike.
3. The lightning protection and abnormal transmission line protection system according to claim 2, wherein the lightning protection unit comprises a three-stage lightning protection device and a lightning current sensor, lightning current is firstly discharged through the first-stage lightning protection device in a lightning protection mode, then is discharged through the second-stage lightning protection device in a lightning protection mode after passing through the power isolation inhibitor, the three-stage lightning protection device is connected with the second-stage lightning protection device in parallel through the switch, different lightning protection levels are selected according to different lightning currents, the N end of the first-stage lightning protection device is connected with a grounding wire after passing through a gas discharge tube, and the lightning current sensor is sleeved on the grounding wire.
4. The lightning protection and abnormal transmission line protection system according to claim 1, wherein the power supply adjusting unit is configured to modulate a voltage of a transmission line to provide an operating voltage to the detecting unit, the lightning protection unit, the control unit and the industrial personal computer integrated system.
5. The lightning protection and abnormal power transmission line protection system according to claim 1, wherein the detection unit is used for detecting the voltage, current, harmonic wave and surge of the power transmission line in real time, and providing data basis for the pre-judgment of the control unit and the rechecking of the industrial personal computer integrated system.
6. The protection method of a lightning protection and anomaly transmission line protection system according to any one of claims 1 to 5, comprising the steps of:
s10, starting a power supply adjusting unit;
s20, the industrial personal computer integrated system monitors the protection system on line in real time;
s30, judging the line monitoring state to determine whether to enter protection;
s40, switching off an input power supply, starting lightning protection and overvoltage protection;
in step S20, the steps of:
s21, detecting and sampling the current, the voltage and the harmonic waves of the power transmission line for a plurality of times by the detecting unit;
s22, the control unit prejudges the actual data information detected by the detection unit, and sends a prejudging result to the industrial personal computer integrated system;
s23, the industrial personal computer integrated system rechecks the prejudgment result of the control unit according to the detection data of the detection unit;
s24, judging whether to perform a protection state mode according to the rechecking result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110985125.4A CN113783174B (en) | 2021-08-25 | 2021-08-25 | Lightning protection and abnormal power transmission line protection method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110985125.4A CN113783174B (en) | 2021-08-25 | 2021-08-25 | Lightning protection and abnormal power transmission line protection method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113783174A CN113783174A (en) | 2021-12-10 |
| CN113783174B true CN113783174B (en) | 2024-03-22 |
Family
ID=78839236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110985125.4A Active CN113783174B (en) | 2021-08-25 | 2021-08-25 | Lightning protection and abnormal power transmission line protection method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113783174B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114552551A (en) * | 2022-02-28 | 2022-05-27 | 国网上海市电力公司 | Multi-station fusion edge data center lightning protection device and sampling control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100026348A (en) * | 2008-08-29 | 2010-03-10 | 현대중공업 주식회사 | Lightning damage monitoring device |
| CN201594731U (en) * | 2009-12-11 | 2010-09-29 | 深圳市永联科技有限公司 | Intelligent photovoltaic array lightning-proof header box |
| CN204465144U (en) * | 2015-03-23 | 2015-07-08 | 南京普天鸿雁电器科技有限公司 | With the lightning protection box of the compatible online lightning monitoring of Long-distance Control break-make |
| WO2015191840A1 (en) * | 2014-06-11 | 2015-12-17 | 540 Grid Solutions, Llc | Surge suppression system for medium and high voltage |
| CN108362950A (en) * | 2018-01-09 | 2018-08-03 | 吉林省泰华电子股份有限公司 | A kind of thunder and lightning intelligent monitor system |
-
2021
- 2021-08-25 CN CN202110985125.4A patent/CN113783174B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100026348A (en) * | 2008-08-29 | 2010-03-10 | 현대중공업 주식회사 | Lightning damage monitoring device |
| CN201594731U (en) * | 2009-12-11 | 2010-09-29 | 深圳市永联科技有限公司 | Intelligent photovoltaic array lightning-proof header box |
| WO2015191840A1 (en) * | 2014-06-11 | 2015-12-17 | 540 Grid Solutions, Llc | Surge suppression system for medium and high voltage |
| CN204465144U (en) * | 2015-03-23 | 2015-07-08 | 南京普天鸿雁电器科技有限公司 | With the lightning protection box of the compatible online lightning monitoring of Long-distance Control break-make |
| CN108362950A (en) * | 2018-01-09 | 2018-08-03 | 吉林省泰华电子股份有限公司 | A kind of thunder and lightning intelligent monitor system |
Non-Patent Citations (1)
| Title |
|---|
| 输电线路雷电预警系统中心站的设计与研发;陶汉涛;谷山强;王海涛;冯万兴;郭钧天;张磊;陈;吴大伟;;高压电器(10);第61-68页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113783174A (en) | 2021-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103529321B (en) | CT saturation detection method | |
| CN111398733B (en) | Ocean nuclear power platform power grid ground fault line selection protection method and system | |
| CN103293415B (en) | Mini-inverter fault detecting method based on neural network expert system | |
| CN205539234U (en) | Arrester performance monitoring system | |
| CN105067963A (en) | Distribution network fault early warning method and system based on transient waveforms | |
| CN105510760A (en) | Method for detecting short circuit fault data based on wavelet analysis | |
| CN109888729B (en) | Early warning type transformer protection method and device | |
| CN105138843A (en) | Electric system sampling flying spot detection and repair method thereof | |
| CN113783174B (en) | Lightning protection and abnormal power transmission line protection method and system | |
| CN103712551A (en) | Power distribution network transformer low-voltage winding deformation on-line monitoring device and method | |
| CN109888733A (en) | A kind of early warning type motor protection method and device | |
| CN109831033A (en) | A kind of power supply line's early warning protection equipment and sectional monitoring early warning system | |
| CN113533910A (en) | Method and system suitable for converter transformer partial discharge early warning | |
| Tajani et al. | A novel differential protection scheme for AC microgrids based on discrete wavelet transform | |
| CN112200998A (en) | Early fire early warning method and system applied to power equipment and storage medium thereof | |
| CN105371742A (en) | Bushing tap pulse signal injection method-based transformer winding deformation detection device and method | |
| CN112748362B (en) | Small current ground fault detection method based on combination of VMD and grey correlation degree | |
| CN112379161B (en) | Alarm method for judging electricity stealing behavior | |
| CN104062555B (en) | The discrimination method of distribution line high resistance earthing fault characteristic harmonics | |
| CN104410053B (en) | DC power transmission system traveling wave protection method | |
| CN109635430A (en) | Grid power transmission route transient signal monitoring method and system | |
| CN116544877B (en) | Relay protection device for real-time monitoring of submarine cable current of offshore oil platform | |
| CN104090211A (en) | Method for online detection of high impedance grounding fault of distributing line | |
| CN113125905B (en) | Arc fault detection device, method, apparatus and storage medium | |
| CN111929630B (en) | Method and device for detecting saturation of current transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |