CN103675669B - Breaker electrical endurance monitoring system and method - Google Patents
Breaker electrical endurance monitoring system and method Download PDFInfo
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- CN103675669B CN103675669B CN201310695878.7A CN201310695878A CN103675669B CN 103675669 B CN103675669 B CN 103675669B CN 201310695878 A CN201310695878 A CN 201310695878A CN 103675669 B CN103675669 B CN 103675669B
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Abstract
The invention discloses a breaker electrical endurance monitoring system and method. The breaker electrical endurance monitoring system comprises a breaker and a power distribution terminal. The breaker comprises an incoming and outgoing line sleeve, a phase-sequence current transformer, a zero-sequence current transformer, a vacuum arc-extinguishing chamber, a fixed contact, a moving contact, a voltage transformer and a disconnecting switch. The breaker is in reliable connection with the power distribution terminal through an aviation plug and a cable, a super distance sensor is arranged in a breaker body and located between the fixed contact and the moving contact. A control chip is arranged in the power distribution terminal and is connected with the phase-sequence current transformer, the zero-sequence current transformer, the super distance sensor and the voltage transformer in the breaker body, and the chip is connected with an alarming module. A sensor in the breaker transmits corresponding data to the power distribution terminal in real time, the power distribution terminal computes the remaining electrical endurance of the breaker through the chip, and an alarming device is started when the remaining electrical endurance is zero.
Description
Technical field
The present invention relates to a kind of circuit monitoring system and monitoring method, more particularly, to a kind of circuit no-failure operation state
Monitoring system and monitoring method.
Background technology
Chopper is widely used in the ring main unit of cable system and on the on-pole switch of built on stilts network, and chopper is as joining
The important segmentation of electrical network backbone, boundary, contact node, play to distribution network line operation monitoring, faulty line are quickly sentenced
The effect broken, position, isolate and restore electricity, is used widely in power system power transmission and distribution.However, chopper is because of load
Impact, cut-off that high current number of times is excessive or long-play easily reaches chopper in the inferior a variety of causes of high current condition
Deformation, wear oxidation etc. so that quiet, moving contact in chopper generate heat using electric life, if overhauling not in time or changing switch
Equipment, can lead to switch in quiet, moving contact because of loose contact, lose the effect of chopper, in addition arcing or the arc time long
And lead to chopper to explode, the accident such as fire.This will affect the operation safety of whole power distribution network.
Chopper has at home and abroad had the development of several more than ten years, chopper quality and performance very reliable, open circuit
The intrinsic electric life of device is that rated short circuit current open and close times can reach 30～50 times.If chopper cut-offs in use
Short circuit current number of times has exceeded specified number of times when dispatching from the factory, and shows that chopper is quiet, moving contact electrical wear has reached its operating limit
Value.In order to realize quiet, the moving contact abrasion oxygen that to the chopper residue monitoring of electric life and early warning it is necessary to chopper are connected
Change, heating deformation extent carries out real-time monitoring.However, quiet, moving contact is internal positioned at closing vacuum bubble, no good means at present
Direct real-time monitoring is carried out to it, indirectly reality can only be carried out to contact of breaker from the basic reason of impact electrical contact endurance
When monitoring.At present, domestic all switch producers simply remove to judge roughly the remaining electric life of chopper according to intrinsic electric life, carry
Awake user overhauls in time or changes switchgear.However, chopper is actual because of each producer's processing technology, fittings quality and switch
The operating reason such as bad, electric life has very big difference, goes to judge that chopper residue electric life is not with intrinsic electric life
Reliably.For example, after a certain secondary line is short-circuited fault, chopper makes chopper transport for a long time because of operating mechanism tripping
Go in high current environment, the quiet, moving contact in chopper is electric because heating, oxidation, deformation etc. have a strong impact on using of chopper
Life-span, and now quiet, moving contact electrical wear situation does not calculate among chopper residue electric life.
Again for example after a certain secondary line is short-circuited fault, chopper carry out disjunction short circuit current overlong time so that
Quiet, moving contact the arcing of chopper, arc time are long, lead to contact because of the serious shadow such as heating, oxidation, electrical wear, deformation
Ring the electric life of chopper, and now chopper residual life successively decreases is once insecure.
Again such as chopper is because the reason such as processing technology is bad is during normal occlusion, separating brake, overtravel serious distortion (
As be ± 2mm), even without overtravel, now, because of quiet, moving contact because no pressure does not fit together, cause chopper empty
Zygosis Phenomenon, now, chopper elasticity electrical wear in surface reaches service life, needs chopper to be overhauled or changes.
Therefore, it is necessary to take certain means to consider the intrinsic electric life of chopper, circuit running current size, arcing or arcing
The correlatives such as time, overtravel remove comprehensive monitoring chopper residue electric life.
Content of the invention
It is an object of the invention to provide a kind of circuit breaker electrical endurance monitoring system and method, solve chopper service life
Cannot effective monitoring technical problem..
For reaching above-mentioned purpose, the invention provides a kind of circuit breaker electrical endurance monitoring system, including chopper, distribution eventually
End, communication module and backstage main website.
Described chopper includes into and out of thread casing, phase sequence current transformer, zero sequence current mutual inductor, vacuum interrupter,
Quiet, moving contact, overtravel sensor, voltage transformer, disconnecting switch.
Described into and out of thread casing connection line mains side and load side, described overtravel sensor is arranged in chopper
Portion, between quiet, moving contact.
Described distribution terminal includes digital signal controller, described phase sequence current transformer, zero sequence current mutual inductor, is out of the line
Journey sensor, voltage transformer are connected with the respective pin of described digital signal controller by transmission line.
Described distribution terminal is in communication with each other by transmission line with described communication module.
Described backstage main website can be long-distance intelligent machine terminal.
Described communication module includes wireless gprs/gsm communication module and rs232/485 communication module, and with described backstage
Main website is communicated by wireless network mode or fieldbus mode.
Described circuit breaker electrical endurance monitoring system also includes alarm module, photo-coupler, display module etc..
The digital signal controller of described distribution terminal and described alarm module, described display module, described communication module,
It is respectively arranged with photo-coupler between described distribution terminal.
Described alarm module is alarm, and described display module is display screen.
Preferably, described digital signal controller can adopt the dsc chip of model stm32f407vg.
Preferably, described communication module can be using h7710 series.
A kind of method carrying out circuit breaker electrical endurance measurement monitoring using circuit breaker electrical endurance monitoring system of the present invention, it is special
Levy and be following steps:
Step one, calculates the absolute wear extent of circuit breaker electrical endurance；
Step 2, calculates circuit breaker electrical endurance relative to electrical wear amount；
Step 3, calculates the elastic electrical wear amount of chopper；
Step 4, calculates chopper residue electric life；
Step 5, assessment chopper residue electric life, send it to corresponding display module or remote monitoring end；
Step 6, according to the chopper residue electric life assessed, corresponding initiation is reported to the police or is sent back by remote monitoring end
Corresponding control instruction.
Disjunction short circuit current number of times when the absolute wear extent of described circuit breaker electrical endurance works for chopper, described circuit breaker electric
Life-span relative wear amount includes: in circuit, current value exceeds the electrical wear amount that the time cumulation of setting threshold values changes into, chopper
During divide-shut brake, arcing or arc time add up the electrical wear amount changing into, and described chopper elasticity electrical wear amount is divided for chopper
The difference apart from l and setpoint distance constant that quiet during combined floodgate, moving contact Contact is flicked again due to inertia.
A kind of method carrying out circuit breaker electrical endurance measurement monitoring using circuit breaker electrical endurance monitoring system of the present invention, including
Following steps:
The intrinsic electric life s of known chopper, in short-circuiting device residue electric life calculates, chooses data below as criterion:
Disjunction short circuit current frequency n during chopper work, the current value in circuit during chopper work exceedes and sets in advance
Threshold values overtime t1, quiet during circuit-breaker switching on-off, moving contact arcing or arc time t2；
Overtime t1 and arcing or arc time t2 are converted to chopper dynamic and static contact abrasion journey by certain algorithm
Degree, with disjunction short circuit current time number scale；
Chopper residue electric life is that original life s deducts overtime t1 and arcing or arc time t2 changes into divides
Disconnected short circuit current number of times；
When chopper residue electric life is 0 time, digital signal controller produces alarm signal, and is sent to warning mould
Block, the alarm of described alarm module starts reports to the police；
Meanwhile, digital signal controller sends the data to communication module；
Alarm signal is sent to backstage main website by local bus or wireless network by communication module.
In addition, the remaining electric life of chopper also by elastic electrical wear amount l as criterion, its step includes:
Described chopper closes a floodgate every time, separating brake when, the distance that quiet, moving contact Contact is flicked again due to inertia is bullet
Property electrical wear amount l；Record elastic electrical wear amount l during each switch motion using overtravel sensor, when elastic electrical wear amount l
During less than setting threshold values, digital signal controller judges the no remaining electric life of chopper, and distribution terminal produces alarm signal, concurrently
Give alarm module, alarm signal is sent to communication module simultaneously, backstage main website is sent to by communication module.
In the above-mentioned methods, distribution terminal can be able to be passed through by the swapping data of gprs communication mode and main website again
Gsm communication mode is sent to user mobile phone alarm signal, has rs232/rs485 Local bus communication interface simultaneously.
By chopper residue electric life monitoring and the method for early warning of the present invention, can overcome the disadvantages that the remaining electricity longevity to chopper at present
Deficiency in life monitoring and method for early warning, can promote the intelligent level of chopper, improve safety, the increasing that chopper runs
Plus the reliability of power supply, ultimately help the development of intelligent distribution network.
Brief description
Fig. 1 is the breaker body structure chart of the chopper residue electric life monitoring and warning system of the present invention；
Fig. 2 is the distribution terminal schematic diagram of the chopper residue electric life monitoring and warning system of the present invention；
Fig. 3 is the principle schematic of the chopper residue electric life monitoring and warning of the present invention；
Fig. 4 is chopper residue electric life monitoring and method for early warning, the criterion schematic diagram of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in detail:
Fig. 1 show the breaker body structural representation of the embodiment of the present invention.
Entrance bushing 1 that breaker body includes being sequentially connected from left to right, zero sequence current mutual inductor 4, moving contact 7, quiet
Contact 6, vacuum interrupter 5, phase sequence current transformer 3, outlet casing tube 2, also include being arranged between moving contact 7 and static contact 6
Voltage transformer 9.It is full of sf6 gas in breaker body.
Entrance bushing 1 and outlet casing tube 2 connect mains side and the load side of breaker body, phase sequence current transformer respectively
3 and zero sequence current mutual inductor 4 be separately positioned on the circuit line of lead collar tube side and entrance bushing side in chopper.Chopper is originally
Body also includes overtravel sensor 8, and it is arranged between static contact 6 and moving contact 7.
Fig. 2 is the distribution terminal schematic diagram of the present invention, and distribution terminal 10 passes through aviation plug and cable with chopper originally
Body is electrically connected.It is provided with digital signal controller, definite value encoder, photo-coupler etc. in distribution terminal 10, do not show in figure
Go out.
Distribution terminal is used for realizing three distant functions of panel switches, soe(logout), time adjustment function etc..Can be real-time
Voltage x current size in separating brake, combined floodgate and fault of the monitoring voltage x current size of transmission line of electricity, on-load switch, the drawing of contact
Arc, arc time, on-load switch close short circuit current number of times statistics.Communication module in the present invention may also be arranged on distribution terminal
Inside, is responsible for and main website real-time Communication for Power.
Fig. 3 is chopper residue electric life monitoring and the prior-warning device schematic diagram of the embodiment of the present invention.
As illustrated, phase sequence current transformer in breaker body, zero sequence current mutual inductor, overtravel sensor and
Voltage transformer is connected with the digital signal controller in distribution terminal 10.Communication module within distribution terminal, alarm module,
Display module is connected to photo-coupler, and the other end of photo-coupler is connected with digital signal controller.Digital Signals
Device is also connected with the travel switch of the dynamic and static Contact Breaking/Making Operations state of monitoring in breaker body, is provided with photo-coupler between it.
During the monitoring system work of the present invention, 3 in breaker body three-phase phase-sequence current transformer, 1 zero sequence electricity
Current transformer, 1 voltage transformer and overtravel sensor send digital signal controller to as analog input.Distribution
Definite value encoder input value in terminal, on off state value, breaking current time numerical value and energy storage state value are defeated as digital quantity
Enter to send digital signal controller to.Communication module is connected with digital signal controller by fieldbus, meanwhile, by scene
Bus or wireless network carry out real-time communication with backstage main website.The controlled quentity controlled variable output signal of digital signal controller acts on open circuit
Quiet, the moving contact of device, is allowed to carry out breaking-closing operating.The alarm control signal of digital signal controller, status display controlled quentity controlled variable
Output valve is respectively acting on alarm module and display module, and the alarm that alarm module adopts may include buzzing warning, acousto-optic report
Alert, data disaply moudle includes led status indicator lamp, lcd LCDs etc..
In real work, digital signal controller can adopt the dsp chip of model stm32f407vg, the inside of chip
Resource is a lot, and memory capacity is big, low price, and arm chip has wireless communication interface, ethernet interface simultaneously, also can produce
Raw pwm ripple, can quickly process and export analog quantity, digital quantity, control signal, alarm signal etc..To control signal, alarm signal
Output increases tlp112 light-coupled isolation it is ensured that the stability of output signal and anti-interference.Meanwhile, using Hong electricity company
H7710 sequence of communications module, as distribution terminal, can be able to be passed through by the swapping data of gprs communication mode and main website again
Gsm communication mode is sent to user mobile phone alarm signal, has the local communication of rs232/rs485 and maintenance interface simultaneously.
Fig. 4 is chopper residue electric life monitoring and the method for early warning criterion schematic diagram of the embodiment of the present invention.Chopper remains
The criterion of remaining electric life includes data that each sensor in distribution terminal records and the intrinsic life value of chopper.Each sensing
Device records the real time data of circuit breaker internal and is sent to central processing unit cpu and is compared, calculates, and the data after process will pass
Giving backstage main website, data monitor in real time is passed through by the monitoring personnel of backstage main website, terminating to report to the police when there is circuit breaker electrical endurance
When, send attendant to go to scene to change chopper, provide user service in time.
Specific computational methods complete in the central processing unit cpu of distribution terminal, comprise the following steps:
The intrinsic electric life of known chopper is disjunction short circuit current number of times is s；
Digital signal controller statistics disjunction short circuit current frequency n when switch runs, in distribution terminal；
When switch runs, distribution terminal passes through current transformer measurement circuitry current value a, when current transformer detects
The current value a arriving is more than setting electric current value, and distribution terminal starts statistics integrating electric time t1, when integrating electric time t1 reaches
During to threshold values w, switch degree of wear m1 increases once, and current time t1 resets, and digital signal controller will switch the degree of wear
M1 is converted to switch disjunction short circuit current number of times, and m1 increases to certain value, and disjunction short circuit current frequency n 1 increases by 1 time, switch mill
Damage degree m1 resets and restarts to accumulate；
When switching each separating brake, closing a floodgate, distribution terminal detects that chopper from electric current generation time t2 of the separating brake that closes a floodgate is
Quiet, moving contact arcing or arc time, electric current generation time t2 is converted to switch electrical wear degree by digital signal controller
M2, when t2 reaches certain threshold values, m2 cumulative rises 1 time, t2 resets and restarts to accumulate, and digital signal controller will switch
Degree of wear m2 is converted to switch disjunction short circuit current number of times, and m2 increases to certain value, and disjunction short circuit current frequency n 2 increases by one
Secondary, switch degree of wear m2 resets and restarts to accumulate；
Generally.The intrinsic electric life of chopper is 30 times.
Digital signal controller calculates the remaining electric life of chopper: n=30-n-n1-n2.
As n=0, switch has been used up its electric life, produces alarm signal by distribution terminal, and is sent to alarm module.
In addition, the remaining electric life of chopper also by elastic electrical wear amount l as criterion, its step includes:
Chopper closes a floodgate every time, separating brake when, the distance that quiet, moving contact Contact is flicked again due to inertia is elasticity electricity
Wear extent l；Record elastic electrical wear amount l during each switch motion using overtravel sensor, when elastic electrical wear amount l <
During 0.5mm, digital signal controller judges that switch has been used up its electric life, and distribution terminal produces alarm signal, and is sent to report
Alarm signal is sent to backstage main website by alert unit simultaneously.
The chopper residue electric life monitoring of the present invention and method for early warning, convert into including the damage that circuit breaker current transfinites
The chopper life-span is monitored for electric life and using elastic electrical wear amount as criterion two aspect, more science, reasonable, tool
There is the meaning of double insurance, using chopper, reliable foundation is provided in electrical network, main facilities to user, it can be avoided that by
Circuit breaker electrical endurance predicts the loss such as the improper fire causing, electric shock.
Above embodiment is only that the preferred embodiment of the present invention is described, and not the scope of the present invention is entered
Row limits, on the premise of without departing from design spirit of the present invention, the technical side to the present invention for this area ordinary skill technical staff
Various modifications and improvement that case is made, all should fall in the protection domain of claims of the present invention determination.
Claims (10)
1. a kind of circuit breaker electrical endurance monitoring system, including breaker body, distribution terminal (10), communication module and backstage master
Stand, entrance bushing (1) that described breaker body includes being sequentially connected from left to right, zero sequence current mutual inductor (4), moving contact
(7), static contact (6), vacuum interrupter (5), phase sequence current transformer (3), outlet casing tube (2), also include being arranged on moving contact
(7) voltage transformer (9) and static contact (6) between, described entrance bushing (1) and outlet casing tube (2) connection line mains side
And load side, described breaker body passes through aviation plug and cable is reliably connected with described distribution terminal (10), its feature
It is,
Described distribution terminal (10) is internally provided with digital signal controller；
Described breaker body is internally provided with overtravel sensor (8), and is located between static contact (6) and moving contact (7)；
The internal digital signal controller of described distribution terminal (10) and described phase sequence current transformer (3), zero sequence current mutual inductance
Device (4), overtravel sensor (8), voltage transformer (9) and described communication module are connected.
2. circuit breaker electrical endurance monitoring system according to claim 1 it is characterised in that
Described backstage main website and described distribution terminal (10) electrical connection or network connection；
Described backstage main website is long-distance intelligent machine terminal；
Described communication module includes wireless gprs/gsm communication module and rs232/485 communication module, and it is with described backstage main website
Communicated by wireless network mode or fieldbus mode.
3. circuit breaker electrical endurance monitoring system according to claim 2 it is characterised in that
Described circuit breaker electrical endurance monitoring system also includes photo-coupler, alarm module, display module；
The digital signal controller of described distribution terminal and described alarm module, described display module, described communication module and disconnected
It is connected by photo-coupler between the internal dynamic and static contact (6,7) of road device.
4. circuit breaker electrical endurance monitoring system according to claim 3 it is characterised in that
Described digital signal controller can adopt the dsc chip of model stm32f407vg；
Described photo-coupler adopts high light velocity photo-coupler tlp112；
Described communication module adopts the h7710 sequence of communications module of Hong electricity company；
Described alarm module includes alarm；
Described display module includes display screen, in real time display chopper residue electric life.
5. a kind of side carrying out circuit breaker electrical endurance monitoring using the arbitrary described circuit breaker electrical endurance monitoring system of claim 1-4
Method is it is characterised in that comprise the following steps:
Step one, calculates circuit breaker electrical endurance absolute electrical wear amount；
Step 2, calculates circuit breaker electrical endurance relative to electrical wear amount；
Step 3, calculates the elastic electrical wear amount of chopper；
Step 4, calculates chopper residue electric life；
Step 5, assessment chopper residue electric life, send it to corresponding display module or remote monitoring end；
Step 6, according to the chopper residue electric life assessed, corresponding initiation is reported to the police or is sent back accordingly by remote monitoring end
Control instruction.
6. circuit breaker electrical endurance according to claim 5 monitoring method it is characterised in that:
Disjunction short circuit current number of times when the absolute electrical wear amount of described circuit breaker electrical endurance works for chopper；
Described circuit breaker electrical endurance includes relative to electrical wear amount: in circuit, current value changes into beyond the time cumulation setting threshold values
Electrical wear amount, during circuit-breaker switching on-off, arcing or arc time add up the electrical wear amount changing into；
Described chopper elasticity electrical wear amount is for quiet, moving contact Contact during circuit-breaker switching on-off because inertia flicks again
The difference apart from l and setpoint distance constant.
7. the method for circuit breaker electrical endurance monitoring according to claim 6 is it is characterised in that comprise the following steps:
The intrinsic electric life (s) of known chopper, in chopper residue electric life calculates, chooses data below as criterion:
Disjunction short circuit current number of times (n) during chopper work, the current value in circuit during chopper work exceedes and sets in advance
The overtime (t1) of threshold values, quiet during circuit-breaker switching on-off, moving contact arcing or arc time (t2)；
Overtime (t1) and arcing or arc time (t2) are converted to chopper dynamic and static contact abrasion journey by certain algorithm
Degree, with disjunction short circuit current time number scale；
Chopper residue electric life deducts overtime (t1) and arcing for original life (s) or the arc time (t2) changes into
Disjunction short circuit current number of times；
When chopper residue electric life is 0 time, digital signal controller produces alarm signal, and is sent to alarm module, institute
The alarm stating alarm module starts warning；
Meanwhile, digital signal controller sends the data to communication module；
Alarm signal is sent to backstage main website by local bus or wireless network by communication module.
8. circuit breaker electrical endurance monitoring method according to claim 7 it is characterised in that
When switching each action, described quiet, moving contact Contact flicks distance (l) again due to inertia, is out of the line using described
Journey sensor records elastic electrical wear amount (l) during each switch motion；
Described digital signal controller reads elastic electrical wear amount (l) that overtravel sensor records；
Set threshold values when described elasticity electrical wear amount (l) is less than, digital signal controller produces alarm signal, and is sent to warning
Module；
The alarm of described alarm module starts reports to the police；
Meanwhile, digital signal controller sends the data to communication module；
Alarm signal is sent to backstage main website by local bus or wireless network by communication module.
9. circuit breaker electrical endurance monitoring method according to claim 8 is it is characterised in that following steps:
The intrinsic electric life of known described chopper is disjunction short circuit current number of times (s)；
When switch runs, described distribution terminal counts disjunction short circuit current frequency n；
When switch runs, described distribution terminal is by described current transformer measurement circuitry current value (a)；
When the current value a that the detection of described current transformer obtains is more than setting electric current value, described digital signal controller starts to unite
Meter electric current overtime (t1)；
When the integrating electric time reaching certain value, switch degree of wear m1 increases once, and the electric current overtime (t1) resets；
Switch degree of wear m1 is converted to switch disjunction short circuit current number of times, switch degree of wear m1 increases to certain value, point
Disconnected short circuit current frequency n 1 increases by 1 time from 0 successively, and switch degree of wear m1 resets and restarts to accumulate；
When switching each separating brake, closing a floodgate, distribution terminal detects that chopper is quiet, dynamic touching from the current vanishes time of the separating brake that closes a floodgate
The arcing of head or arc time (t2)；
Accumulation arcing or arc time (t2) are converted to switch electrical wear degree m2, and switch electrical wear degree m2 increases by 1 time, accumulation
Arcing or arc time (t2) reset and restart to accumulate；
Switch degree of wear m2 is converted to switch disjunction short circuit current number of times, it increases to certain value, disjunction short circuit current
Number n2 increases once from 0 successively, and switch degree of wear m2 resets and restarts to accumulate；
The digital signal controller of described distribution terminal calculates the remaining electric life of chopper: n=s-n-n1-n2；
As n=0, switch has been used up its electric life, sends alarm signal by the digital signal controller of distribution terminal, and transmits
To alarm module；
Described distribution terminal sends alarm signal to backstage main website simultaneously.
10. circuit breaker electrical endurance monitoring method according to claim 9 it is characterised in that
Described distribution terminal passes through the swapping data of gprs communication mode and main website；
Described distribution terminal is sent to user mobile phone also by gsm communication mode alarm signal, has rs232/rs485 simultaneously
Local communication function.
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