CN110426607A - The monitoring system of arc flash occurs for a kind of identification lightning current - Google Patents
The monitoring system of arc flash occurs for a kind of identification lightning current Download PDFInfo
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- CN110426607A CN110426607A CN201910475643.4A CN201910475643A CN110426607A CN 110426607 A CN110426607 A CN 110426607A CN 201910475643 A CN201910475643 A CN 201910475643A CN 110426607 A CN110426607 A CN 110426607A
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- 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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Abstract
The invention discloses the monitoring systems that arc flash occurs for a kind of identification lightning current, monitoring system includes: lightning stroke monitor and host computer, carried out data transmission between lightning stroke monitor and host computer by wireless communication mode, the data that host computer sends the lightning stroke monitor received carry out current waveform reduction, and identification, the chain processing alarmed when waveform variation is beyond threshold values are carried out with reference waveform curve.Monitoring system of the invention can high-energy (waveform shows as 10/350uS) lightning current to the middle low frequency in a lightning stroke process carry out waveform reduction, pass through point-by-point acquisition and recording, reduction lightning current waveform is run by software in host computer, and it is compared in standard lightning current (10/350uS waveform), if waveform change rate is more than early warning threshold values, chain processing of alarming is carried out.Whether the present invention can not only be monitored by lightning stroke petrochemical equipment, at the same can intellectual analysis whether arc flash occurs on leakage path, early warning is carried out to the quick-fried event of sudden strain of a muscle that may occur.
Description
Technical field
The present invention relates to a kind of monitoring systems, more specifically, it relates to which arc flash occurs for a kind of identification lightning current
Monitoring system.
Background technique
Petroleum chemical enterprise volatilizees in process of production or discharges imflammable gas, these gases form explosion after mixing with air
Property mixed gas, can occur detonation when these gases encounter high temperature, open fire under a certain concentration.
Petrochemical industry operation area, memory block are typically found at open field, and thunderstorm season easily occurs direct lightning strike invasion and sets
Standby phenomenon occurs.When thunder and lightning flow direction the earth is released, such as poor contact between metal component on leakage path or there is gap, pole
Easily there is a phenomenon where high pressure lightning current breakdown dielectric (air) to form arc flash.Around the spark initiation of this high-energy
Explosive mixed combustible gas body is the immediate cause that lightning stroke Fire explosion occurs for petrochemical industry.
When petrochemical equipment, storage tank are hit by direct lightning strike, it can identify whether electricity occurs on lightning current leakage path early
Arc flashover, can timely early warning can be by economic loss, ecological disruption, social shadow to saving and control fire spread is significant
Sound is preferably minimized value.
The similar product state of the art:
The thunder and lightning flow assay device of petrochemical industry field application at present, can only to lightning stroke time of origin, lightning current peak value into
Row acquisition and recording, to master system, part instrument can be acquired lightning current waveform for scene display or teletransmission.But this side
Formula can only be acquired record to lightning current, cannot conduct release by lightning current and arc flash whether has occurred in the process divided
Analysis identification and early warning.
Summary of the invention
The purpose of the present invention is to provide the monitoring systems that arc flash occurs for a kind of identification lightning current, solve existing thunder and lightning
Flow assay device can only be acquired record to lightning current, and lightning current cannot being conducted to release, electric arc sudden strain of a muscle whether has occurred in the process
Network carries out the technical issues of analysis identification and early warning.
To achieve the above object, the present invention provides the following technical scheme that
The present invention provides a kind of monitoring system of identification lightning current generation arc flash, and the monitoring system includes: lightning stroke
Monitor and host computer are carried out data transmission between lightning stroke monitor and the host computer by wireless communication mode, it is described on
The data that position machine sends the lightning stroke monitor received carry out current waveform reduction, and are known with reference waveform curve
Do not compare, the chain processing alarmed when waveform variation is beyond threshold values.
Preferably, the lightning stroke monitor includes:
Power supply module, the power supply module are all need electricity module for power supply；
Lightning current waveform sensor, the lightning current waveform sensor are the sensor for detecting Leibo shape, itself is worked
Cheng Wuxu power supply, the signal of output is lightning current time differential；
Integral Processing module, the signal that the Integral Processing module is used to export the lightning current waveform sensor carry out
Lightning current signals are reduced to analog voltage signal by Integral Processing, the Integral Processing module；
AD voltage acquisition module, the AD voltage acquisition module are used to acquire the simulation electricity of the Integral Processing module output
Press signal；
Absolute value circuit module, the absolute value circuit module are to guarantee the positive voltage signal of lightning current either downlink thunder
Or the negative voltage signal of uplink thunder, can be collected by the AD voltage acquisition module；
Main control module, the data that the main control module acquires the AD voltage acquisition module carry out calculation process；
Wireless sending module, treated that data are wirelessly sent to institute by the main control module for the wireless sending module
Host computer is stated, data are sent to the wireless sending module by the main control module in the form of data packet, and described in control
The transmission of wireless sending module.
Preferably, the data-signal of transmission is modulated processing by transmission antenna by the wireless sending module.
Preferably, the lightning stroke monitor also includes clock module, and the main control module has sent a lightning stroke process
Described in after lightning current waveform sensor collects the waveform thunder and lightning flow data of data group, by clock information from the clock module
Middle extraction, and sent by the wireless sending module, the time as generation of being this time struck by lightning.
Preferably, the power supply module can add electric power storage pool mode or online AC and DC powering mode for solar panels.
Preferably, the lightning current waveform sensor can be Rogowski coil sensor or Hall sensor.
Preferably, the AD voltage acquisition module frequency acquisition is 1uS/ times, and one group of 10/350uS waveform lightning current is minimum
Acquisition data 360, a lightning discharge is by multiple groups wave component.
Preferably, the host computer includes:
Wireless receiving module, the wireless sending module that the wireless receiving module receives the lightning stroke monitor send over
Data；
Chain processing module, the data that the chain processing module receives the wireless receiving module carry out current wave
Shape reduction, and identification, the chain processing alarmed when waveform variation is beyond threshold values are carried out with reference waveform curve.
Preferably, received data-signal is modulated processing by receiving antenna by the wireless receiving module.
Preferably, pass through GPRS, Zigbee, 433MHz or 2.4G wireless telecommunications between lightning stroke monitor and the host computer
Mode carries out data transmission.
In conclusion the present invention mainly has the advantages that
The present invention provides a kind of monitoring system of identification lightning current generation arc flash, and the monitoring system includes: lightning stroke
Monitor and host computer are carried out data transmission between lightning stroke monitor and the host computer by wireless communication mode, it is described on
The data that position machine sends the lightning stroke monitor received carry out current waveform reduction, and are known with reference waveform curve
Do not compare, the chain processing alarmed when waveform variation is beyond threshold values.Monitoring system of the invention can be to a lightning stroke process
In high-energy (waveform the shows as 10/350uS) lightning current of middle low frequency carry out waveform reduction, by point-by-point acquisition and recording,
Reduction lightning current waveform is run by software in host computer, and is compared in standard lightning current (10/350uS waveform), such as wave
Deformation rate is more than early warning threshold values, carries out chain processing of alarming.Whether the present invention can not only be to petrochemical equipment by lightning stroke progress
Monitoring, at the same can intellectual analysis whether arc flash occurs on leakage path, the quick-fried event of the sudden strain of a muscle being likely to occur is carried out pre-
It is alert, it helps petrochemical industry to establish effectively coping mechanism in advance, can be put out rapidly in Initial Stage of Fire, loss is reduced to minimum journey
Degree.
Detailed description of the invention
Fig. 1 is lightning current waveform figure；
Fig. 2 is that solar panels add rechargeable lithium battery power supply circuit；
Fig. 3 is lithium battery voltage detection circuit figure；
Fig. 4 is solar panels voltage detecting circuit figure；
Fig. 5 is lithium battery charging circuit；
Fig. 6 is sensor equivalent circuit figure；
Fig. 7 is integrating circuit figure；
Fig. 8 is absolute value circuit figure；
Fig. 9 is main control module circuit diagram；
Figure 10 is the structural schematic diagram of monitoring system of the present invention；
Figure 11 is the structural schematic diagram of present invention lightning stroke monitor；
Figure 12 is the structural schematic diagram of host computer of the present invention；
Figure 13 is chain processing module waveform drawing coordinate diagram.
Specific embodiment
Lightning current wave is a kind of harmonic wave, is formed, is mainly had: 10/350uS, 8/20uS, 1.25/ there are many addition of waveforms
40uS etc., wherein the main energetic of lightning current 90% is distributed in low frequency, and the waveform form of expression is 10/350uS (such as attached drawing 1
It is shown).
Lightning current is a kind of waveform in unipolarity atypia period, usually rises to amplitude (peak in a short period of time
Value), decay then again by the relatively slow decline of peak value, then after restoring to peak value, releases until completing a lightning current.For
Unipolar lightning current waveform mainly has 3 parameters to indicate: amplitude, wave head time and half amplitude time.
From attached drawing 1 it can be seen that, lightning current from 0 point to the rise time of peak value be it is very short, after reaching peak value with compared with
Slowly decline for a long time；When being known as wave head from D point (10% peak value) to the time A point (thunder and lightning flow valuve reaches 90% amplitude)
Between, it is indicated with T1；It is known as wavelength time from D point (10% peak value) to the time G point (thunder and lightning flow valuve reaches 50% amplitude),
It is indicated with T2；The major parameter for determining lightning current waveform is amplitude and wave head time.
The wave head time of direct lightning strike 10/350uS waveform is 10uS, and arc flash electric discharge such as occurs, and breakdown air needs make
Air ionization, this process need the time, and the wave head time can extend；Spark discharge needs to consume current energy, and current amplitude can be sent out
Raw rapid drawdown.
10/350uS reference waveform carries out data comparison from the 10/350uS lightning current waveform and database detected, such as
Biggish deviation occurs for curve waveform, can determine whether out whether arc flash occurs.
Present inventive concept is as follows:
The invention solves existing thunder and lightning flow assay devices, and record can only be acquired to lightning current, cannot spread thunder and lightning
It leads to release and the technical issues of arc flash carries out analysis identification and early warning whether has occurred in the process.
The present invention provides the following technical scheme that
The present invention provides a kind of monitoring system (as shown in Fig. 10) of identification lightning current generation arc flash, the monitoring
System includes: lightning stroke monitor (as shown in Fig. 11) and host computer (as shown in Fig. 12), the lightning stroke monitor and upper
Carried out data transmission between machine by wireless communication mode, the number that the host computer sends the lightning stroke monitor received
Identification is carried out according to progress current waveform reduction, and with reference waveform curve, is alarmed when waveform variation is beyond threshold values
Chain processing.
Monitoring system of the invention can high-energy to the middle low frequency in a lightning stroke process (waveform shows as 10/
350uS) lightning current carries out waveform reduction, by point-by-point acquisition and recording, runs reduction lightning current waveform by software in host computer,
And compared in standard lightning current (10/350uS waveform), if waveform change rate is more than early warning threshold values, carry out the chain place that alarms
Reason.Whether the present invention can not only be monitored by lightning stroke petrochemical equipment, at the same can intellectual analysis whether on leakage path
Arc flash occurs, early warning is carried out to the quick-fried event of the sudden strain of a muscle being likely to occur, helps petrochemical industry to establish and effectively copes with machine in advance
System, can put out rapidly in Initial Stage of Fire, loss is reduced to minimum.
Below in conjunction with attached drawing, invention is further described in detail.
The monitoring system of arc flash occurs for a kind of identification lightning current, as in Figure 2-4,
The monitoring system includes: lightning stroke monitor (slave computer) 10 and host computer 20, and the lightning stroke monitor is (the next
Machine) carried out data transmission between 10 and host computer 20 by wireless communication mode, the thunder that the host computer 20 will receive
It hits the data that monitor (slave computer) 10 is sent and carries out current waveform reduction, and carry out identification, wave with reference waveform curve
Deformationization exceeds the chain processing alarmed when threshold values.
Specifically, between the lightning stroke monitor (slave computer) 10 and host computer 20 by GPRS, Zigbee, 433MHz or
2.4G wireless communication mode carries out data transmission.
Specifically, the lightning stroke monitor 10 includes:
Power supply module 11, the power supply module 11 are all need electricity module for power supply；
Specifically, the power supply module 11 can add electric power storage pool mode or online AC and DC power supply mould for solar panels
Formula, scene are mostly field or are inconvenient to lay power supply line's occasion, and the embodiment of the present invention is added and can be filled using existing solar panels
Electric lithium battery power supply technology (as shown in Fig. 2), solar panel export electric energy and charge to rechargeable lithium battery, chargeable lithium
Battery exports electric energy by power conversion module and gives need electric module.Charge controller controls the charging rate of battery, every 20
Minute just detects the output voltage of lithium battery, and according to detection voltage value, output phase answers the PWM waveform of duty ratio to control P-MOS
The working condition of pipe.
The embodiment of the present invention uses existing solar panels that rechargeable lithium battery mode is added to be powered for lightning stroke monitor,
As shown in attached drawing 3 and attached drawing 4, respectively lithium battery and solar panels voltage detecting circuit.Voltage signal is connected
Journey is set in electric resistance partial pressure, the input for making voltage division signal be suitble to charge controller.The signal of input enters charge controller (single-chip microcontroller)
Internal A/D converter is converted to digital signal, by Digital Signal Processing, voltage value is identified, so as to carry out PWM wave
Adjustment controls charge rate.
It is as shown in Fig. 5 the charging circuit of lithium battery, solar panels output voltage signal passes through anti-recoil diode D1,
Linear regulator chip LM2576 is controlled using electronic switch TPCF8105, TPCF8105.To make battery provide burning voltage,
Voltage stabilizing chip LM2576 must be used to carry out voltage conversion.
Lightning current waveform sensor 12, sensor equivalent circuit figure is as shown in Fig. 6, the lightning current waveform sensor 12
For the sensor for detecting the Leibo 10/350uS shape, for itself course of work without power supply, the signal of output is lightning current to the time
Differential.
Specifically, the lightning current waveform sensor 12 can be Rogowski coil sensor or Hall sensor.
Integral Processing module 13, integrating circuit figure is as shown in Fig. 7, and the Integral Processing module 13 is used for the thunder and lightning
It flows the signal that model transducer 12 exports and carries out Integral Processing, lightning current signals are reduced to simulate by the Integral Processing module 13
Voltage signal, this voltage signal are divided into positive and negative；
AD voltage acquisition module 14, the AD voltage acquisition module 14 are used to acquire what the Integral Processing module 13 exported
Analog voltage signal.
Specifically, 14 frequency acquisition of AD voltage acquisition module is 1uS/ times, and one group of 10/350uS waveform lightning current is most
Data 360 are acquired less, and a lightning discharge is by multiple groups wave component.
Absolute value circuit module 15, absolute value circuit figure is as shown in Fig. 8, and the absolute value circuit module 15 is to guarantee thunder
(lightning current flows to the positive voltage signal or uplink thunder of electric current either downlink thunder (lightning current flows to the earth from sky) from the earth
Sky) negative voltage signal, can be collected by the AD voltage acquisition module 14.
Voltage waveform of 13 output amplitude of Integral Processing module between ± 3.5V, by absolute value circuit by input voltage
0-3.5V voltage is converted to, carries out voltage acquisition for AD voltage acquisition module 14.
Main control module 16, main control module circuit diagram is as shown in Fig. 9, and the main control module 16 is by the AD voltage
The data that acquisition module 14 acquires carry out calculation process, and main control module 16 is single-chip microcontroller main control module, and core is monolithic
Machine.
Main control module of the embodiment of the present invention uses STM32F103VET6 single-chip microcontroller for Master control chip, and responsible voltage is adopted
The functions such as collection, data calculation processing, storage, data interaction, control wireless sending module.
Wireless sending module 17, treated that data are wirelessly sent out by the main control module 16 for the wireless sending module 17
The host computer 20 is given, the main control module 16 sends 360 number evidences to the wireless transmission in the form of data packet
Module 17, and control the transmission of the wireless sending module 17.
Specifically, the data-signal of transmission is modulated processing by transmission antenna 18 by the wireless sending module 17.
Specifically, the lightning stroke monitor 10 also includes clock module 19, and the main control module 16 has sent a thunder
After hitting the 10/350uS waveform thunder and lightning flow data that the lightning current waveform sensor 12 in the process collects data group, clock is believed
Breath is extracted from the clock module 19, and is sent by the wireless sending module 17, is occurred as this time lightning stroke
Time.
Specifically, the host computer 20 includes:
Wireless receiving module 21, the wireless receiving module 21 receive the wireless sending module 17 of the lightning stroke monitor 10
The data sended over, wireless receiving module 21 are made of antenna and receiver, and aerial signal is carried out frequency modulation processing by receiver
Afterwards, data interaction is carried out by USB interface and computer；
Chain processing module 22, the data that the chain processing module 22 receives the wireless receiving module 21 carry out
Current waveform reduction, and identification, the chain place to alarm when waveform variation is beyond threshold values are carried out with reference waveform curve
Reason.
The carrier of chain processing module 22 can be the terminal devices such as computer or Ipad, the present embodiment by taking computer as an example,
Computer is desktop computer or laptop, and operation program is Windows98 or more, wireless receiving module and intercomputer
Data interaction is carried out using the communication modes such as USB or RS232 or RS485, runs software using language such as C#, Delphi, Java
Establishment will upload data and carry out current waveform reduction, and waveform drawing (reduction) is with a regular length and fixed height rectangle
Reference data, in a coordinate system, setting horizontal axis length are X, are the time quantum of waveform；Y-axis (ordinate) is lightning current signals
Numerical value is the amplitude of lightning current.Computer by the data received according to program carry out waveform drawing and with standard 10/350uS
Wavy curve carries out identification, carries out the chain processing such as alarm when waveform variation is beyond threshold values.
Specifically, received data-signal is modulated processing by receiving antenna 23 by the wireless receiving module 21.
Lightning current is when leakage path conducts, when because there is gap between conductor between poor contact or conductor, high-voltage electricity potential difference
By air ionization, discharge channel is made, there have been arc flashes.This arc flash endangers not in non-explosion-proof area
Greatly, it may be said that be that (this arc flash frequently appears in the lead of high voltage power transmission tower, broadcasting television tower the phenomenon that often appearance
On).
Current lightning stroke detection device has to be used on the lightning rod, oil storage tank, reaction unit of petrochemical industry.It is at present
Function whether equipment can only be occurred lightning stroke be monitored, to thunder and lightning flow to the earth conduction in arc flash whether occurs can not
It is monitored and early warning.
Monitoring system of the invention can high-energy to the middle low frequency in a lightning stroke process (waveform shows as 10/
350uS) lightning current carries out waveform reduction.By point-by-point acquisition and recording, lightning current waveform is restored in upper computer software row, and in mark
Quasi- lightning current (10/350uS waveform) compares, and if waveform change rate is more than early warning threshold values, carries out chain processing of alarming.This hair
It is bright whether petrochemical equipment to be monitored by lightning stroke, at the same can intellectual analysis whether electric arc occurs on leakage path
Flashover carries out early warning to the quick-fried event of the sudden strain of a muscle being likely to occur, and helps petrochemical industry to establish effectively coping mechanism in advance, in fire
Initial stage can put out rapidly, and loss is reduced to minimum.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (10)
1. the monitoring system that arc flash occurs for a kind of identification lightning current, which is characterized in that the monitoring system includes: lightning stroke prison
Instrument and host computer are surveyed, is carried out data transmission between lightning stroke monitor and the host computer by wireless communication mode, it is described upper
The data that machine sends the lightning stroke monitor received carry out current waveform reduction, and are identified with reference waveform curve
Compare, the chain processing alarmed when waveform variation is beyond threshold values.
2. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 1, which is characterized in that described
Lightning stroke monitor include:
Power supply module, the power supply module are all need electricity module for power supply；
Lightning current waveform sensor, the lightning current waveform sensor be detect Leibo shape sensor, itself course of work without
It needs to power, the signal of output is lightning current time differential；
Integral Processing module, the signal that the Integral Processing module is used to export the lightning current waveform sensor integrate
Lightning current signals are reduced to analog voltage signal by processing, the Integral Processing module；
AD voltage acquisition module, the AD voltage acquisition module are used to acquire the analog voltage letter of the Integral Processing module output
Number；
Absolute value circuit module, the absolute value circuit module be guarantee lightning current either the positive voltage signal of downlink thunder or
The negative voltage signal of uplink thunder can be collected by the AD voltage acquisition module；
Main control module, the data that the main control module acquires the AD voltage acquisition module carry out calculation process；
Wireless sending module, treated that data are wirelessly sent on described by the main control module for the wireless sending module
Data are sent to the wireless sending module by position machine, the main control module in the form of data packet, and are controlled described wireless
The transmission of sending module.
3. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 2, which is characterized in that described
The data-signal of transmission is modulated processing by transmission antenna by wireless sending module.
4. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 3, which is characterized in that described
The monitor that is struck by lightning also includes clock module, and the main control module has sent the sensing of lightning current waveform described in a lightning stroke process
After device collects the waveform thunder and lightning flow data of data group, clock information is extracted from the clock module, and pass through the nothing
Line sending module is sent, the time as generation of being this time struck by lightning.
5. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 4, which is characterized in that described
Power supply module can add electric power storage pool mode or online AC and DC powering mode for solar panels.
6. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 5, which is characterized in that described
Lightning current waveform sensor can be Rogowski coil sensor or Hall sensor.
7. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 6, which is characterized in that described
AD voltage acquisition module frequency acquisition is 1uS/ times, and one group of 10/350uS waveform lightning current at least acquires data 360, a thunder
Electric discharge is hit by multiple groups wave component.
8. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 1, which is characterized in that described
Host computer includes:
Wireless receiving module, the wireless receiving module receive the number that the wireless sending module of the lightning stroke monitor sends over
According to；
Chain processing module, the data that the chain processing module receives the wireless receiving module carry out current waveform also
Original, and identification, the chain processing alarmed when waveform variation is beyond threshold values are carried out with reference waveform curve.
9. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 8, which is characterized in that described
Received data-signal is modulated processing by receiving antenna by wireless receiving module.
10. the monitoring system that arc flash occurs for a kind of identification lightning current according to claim 1, which is characterized in that institute
It states and is carried out data transmission between lightning stroke monitor and host computer by GPRS, Zigbee, 433MHz or 2.4G wireless communication mode.
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| KR101665952B1 (en) * | 2016-03-07 | 2016-10-24 | 상도전기통신 주식회사 | System for detecting the resistive leakage current and the insulation damage using high frequency CT and ZCT |
| CN107064677A (en) * | 2017-04-05 | 2017-08-18 | 昆明理工大学 | A kind of method for differentiating transmission line lightning stroke flashover and non-flashover |
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| CN109765441A (en) * | 2018-12-27 | 2019-05-17 | 国网浙江诸暨市供电有限公司 | The sub- fault judgment method of Intelligent insulation |
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