CN103675667A - Load switch electrical endurance monitoring system and method - Google Patents
Load switch electrical endurance monitoring system and method Download PDFInfo
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- CN103675667A CN103675667A CN201310693629.4A CN201310693629A CN103675667A CN 103675667 A CN103675667 A CN 103675667A CN 201310693629 A CN201310693629 A CN 201310693629A CN 103675667 A CN103675667 A CN 103675667A
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Abstract
The invention discloses a load switch electrical endurance monitoring system and method. The load switch electrical endurance monitoring system comprises a load switch and a power distribution terminal. The load switch comprises an incoming and outgoing line sleeve, a phase current transformer, a zero sequence current transformer, a vacuum arc-extinguishing chamber, a static contact, a moving contact, a voltage transformer and an isolating switch. The load switch is reliably connected with the power distribution terminal through an aviation plug and a cable. An overtravel sensor is arranged in a load switch body and located between the static contact and the moving contact. A control chip is arranged in the power distribution terminal and connected with the phase current transformer, the zero sequence current transformer, the overtravel sensor and the voltage transformer in a load switch body, and the control chip is connected to an alarm module. The sensor in the load switch transmits corresponding data to the power distribution terminal in real time, the power distribution terminal computes the residual electrical endurance of the load switch through the control chip of the power distribution terminal, and an alarm device can be started when the residual electrical endurance of the load switch is zero.
Description
Technical field
The present invention relates to a kind of monitoring system and method, relate in particular to a kind of electric service life monitor system and method.
Background technology
On-load switch is widely used in the ring main unit of cable system and on the on-pole switch of built on stilts network, on-load switch is as the important boundary of distribution backbone, contact node, play to the operation monitoring of distribution network line with to quick judgement, the location of faulty line, the effect isolating and restore electricity, in electric system power transmission and distribution, be used widely.Yet, on-load switch because of load impact, close large electric current number of times too much or long-play is easy to reach the use electric life of on-load switch in the inferior a variety of causes of large current condition, make quiet, moving contact heating distortion in on-load switch, wear oxidation etc., if overhaul not in time or change switchgear, can cause quiet in switch, moving contact because of loose contact, lose the effect of on-load switch, even arcing or arc time are long and cause the accidents such as on-load switch is blasted, fire.This is by the security of operation of the whole power distribution network of impact.
On-load switch has had the development of several more than ten years at home and abroad, and on-load switch quality and performance is very reliable, and the intrinsic electric life of on-load switch is that rated short circuit current closes number of times and can reach 3～5 times.If on-load switch in use closes short-circuit current number of times, surpassed the specified number of times while dispatching from the factory, shown that on-load switch is quiet, moving contact electrical wear has reached its operating limit value.At present, in the residual electricity life-span that domestic all switch producer just removes to judge roughly on-load switch according to intrinsic electric life, reminding user overhauls or changes switchgear in time.Yet on-load switch is because of the reason such as bad in each producer's manufacture craft, fittings quality and switch actual motion, electric life has very large difference, with intrinsic electric life, goes to judge that the on-load switch residual electricity life-span is insecure.
For example, at a certain secondary line, be short-circuited after fault, on-load switch because of superior load switch in time cutting-off of short-circuit fault make on-load switch long-play in large electric current environment, quiet, moving contact in on-load switch has a strong impact on the use electric life of on-load switch because of heating, oxidation, distortion etc., and now electrical wear situation quiet, moving contact did not calculate among the on-load switch residual electricity life-span.
For example at a certain secondary line, be short-circuited after fault again, fault is not also got rid of and on-load switch is closed a floodgate because of maloperation, on-load switch closes short-circuit current overlong time because of mechanical reason, make arcing, the arc time of contact long, cause quiet, moving contact in on-load switch to have a strong impact on the electric life of on-load switch because of heating, oxidation, electrical wear, distortion etc., and now on-load switch residual life to successively decrease be once insecure.
Again for example, on-load switch is because the reason such as manufacture craft is bad is in normal occlusion, separating brake process, over travel serious distortion (being generally ± 2mm), even there is no over travel, now, because quiet, moving contact is not because fitting together without pressure, cause the empty Zygosis Phenomenon of on-load switch, now, the electrical wear of surface loading switch elasticity has reached serviceable life, need to on-load switch be overhauled or be changed.Therefore the correlatives such as intrinsic electric life, circuit running current size, arcing or arc time, over travel that, must take certain means to consider on-load switch are gone the comprehensive monitoring on-load switch residual electricity life-span.
Summary of the invention
The object of the present invention is to provide a kind of on-load switch electric service life monitor system and method.
For achieving the above object, the invention provides a kind of on-load switch electric service life monitor system, comprise on-load switch, distribution terminal, communication module and backstage main website.
Described on-load switch comprises into and out of thread casing, phase-sequence current mutual inductor, zero sequence current mutual inductor, vacuum interrupter, quiet, moving contact, over travel sensor, voltage transformer (VT), disconnector.
Described into and out of thread casing connection line mains side and load side, described over travel sensor setting is inner at on-load switch, between quiet, moving contact.
Described distribution terminal comprises digital signal controller, and described phase-sequence current mutual inductor, zero sequence current mutual inductor, over travel sensor, voltage transformer (VT) are connected with the respective pin of described digital signal controller by transmission line.
Described distribution terminal intercoms by transmission line mutually with described communication module.
Described backstage main website is long-distance intelligent machine terminal.
Described communication module comprises wireless GPRS/gsm communication module and RS232/485 communication module, and communicates by letter by wireless network mode or fieldbus mode with described backstage main website.
Described on-load switch electric service life monitor system also comprises alarm module, photo-coupler, display module etc.
Between the digital signal controller of described distribution terminal and described alarm module, described display module, described communication module, described distribution terminal, be respectively arranged with photo-coupler.
Described alarm module is alarm, and described display module is display screen.
Preferably, can to adopt model be the DSC chip of STM32f407VG to described digital signal controller.
Preferably, described communication module can adopt H7710 series.
A kind of on-load switch electric service life monitor system that utilizes of the present invention carries out the method that on-load switch electric life is measured monitoring, it is characterized in that following steps:
The absolute wear extent of described on-load switch electric life closes short-circuit current number of times while being on-load switch work, described on-load switch electric life relative wear amount comprises: in circuit, current value exceeds and sets the electrical wear amount that the time cumulation of threshold values changes into, the electrical wear amount that during on-load switch separating brake, arcing or arc time accumulative total change into.The distance elasticity electrical wear amount L that quiet when described on-load switch elasticity electrical wear amount is on-load switch separating brake, moving contact Contact flicks again due to inertia and setpoint distance constant poor.
A kind of on-load switch electric service life monitor system that utilizes of the present invention carries out the method that on-load switch electric life is measured monitoring, comprises the following steps:
The intrinsic electric life S of known on-load switch, in calculating, chooses following data as criterion in the short-circuiting device residual electricity life-span:
In on-load switch when work, closes short-circuit current frequency n, and current value during on-load switch work in circuit surpasses the overtime t1 of the threshold values of setting in advance, arcing or the arc time t2 of quiet during on-load switch separating brake, moving contact;
Overtime t1 and arcing or arc time t2 are converted to the dynamic and static contact abrasion degree of on-load switch by certain algorithm, to close short-circuit current time number scale;
The on-load switch residual electricity life-span be original life S deduct that overtime t1 and arcing or arc time t2 change into close short-circuit current number of times;
When the on-load switch residual electricity life-span is 0 time, digital signal controller produces alerting signal, and sends to alarm module, and the alarm of described alarm module starts reports to the police;
Meanwhile, digital signal controller sends the data to communication module;
Communication module sends to backstage main website by alerting signal by local bus or wireless network.
In addition, the residual electricity life-span of on-load switch is also passed through elasticity electrical wear amount L as criterion, and its step comprises:
Described on-load switch closes a floodgate at every turn, during separating brake, distance quiet, that moving contact Contact flicks again due to inertia is elasticity electrical wear amount L; Elasticity electrical wear amount L while using over travel sensor to record each switch motion, when elasticity electrical wear amount L is less than setting threshold values, judge that the digital signal controller judgement on-load switch residual electricity life-span is 0 time, distribution terminal produces alerting signal, and send to alarm module, alerting signal is sent to communication module simultaneously, by communication module, send to backstage main website.
In said method, distribution terminal can send to user mobile phone alerting signal by gsm communication mode again by swap data between GPRS communication mode and main website, has RS232/RS485 local bus communication interface simultaneously.
By on-load switch residual electricity life-span monitoring of the present invention and method for early warning, can make up at present to the deficiency on the monitoring of on-load switch residual electricity life-span and method for early warning, the reliability that can promote the intelligent level of on-load switch, the security that improves on-load switch operation, increase power supply, finally contributes to the development of intelligent distribution network.
Accompanying drawing explanation
Fig. 1 is load switch body structural drawing of the present invention;
Fig. 2 is distribution terminal schematic diagram of the present invention;
Fig. 3 is the principle schematic of on-load switch residual electricity life-span monitoring and warning of the present invention;
Fig. 4 is on-load switch residual electricity life-span monitoring of the present invention and method for early warning, criterion schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail:
Shown in figure 1, the on-load switch residual electricity life-span monitoring warning device of the embodiment of the present invention comprises:
Load switch body: be inside full of SF6 gas, take vacuum interrupter.
Load switch body comprises the entrance bushing 1, the moving contact 8 that set gradually from left to right, be flexible coupling 5, vacuum interrupter 6, static contact 7, current transformer 4, outlet casing tube 2, between described entrance bushing 1 and moving contact 8, along on-load switch inwall, be provided with voltage sensor 3, described in be flexible coupling and 5 be connected between moving contact 8 and disconnector 11.Entrance bushing 1 and outlet casing tube 2 be mains side and the load side of connected load Switch main body respectively, and voltage transformer (VT) 3 summation current transformers 4 are separately positioned on the circuit line of the interior entrance bushing side of on-load switch and outlet casing tube side.Load switch body also comprises over travel sensor 9, and it is arranged between static contact 7 and moving contact 8.5 connection disconnector and the on-load switches that are flexible coupling, guarantee that disconnector and on-load switch do not influence each other in course of action; Built-in quiet, the moving contact of vacuum interrupter 6, reliable arc extinguishing while guaranteeing switch motion under vacuum environment.
Fig. 2 is distribution terminal schematic diagram of the present invention.
Distribution terminal 10 is electrically connected by aviation plug and cable and load switch body.
Distribution terminal 10 inside comprise digital signal controller, definite value scrambler, photo-coupler and communication module etc., not shown in the drawings.
Distribution terminal is for realizing three distant functions of panel switches, SOE(logout), time adjustment function etc.Electric current and voltage size, electric current and voltage size, the arcing of contact, arc time, the on-load switch of on-load switch when separating brake, combined floodgate and fault that can Real-Time Monitoring transmission line of electricity close short-circuit current number of times and add up.Be responsible for and main website real-time Communication for Power simultaneously.
Fig. 3 is the monitoring of on-load switch residual electricity life-span and the prior-warning device schematic diagram of the embodiment of the present invention.
As shown in the figure, the current transformer in load switch body, over travel sensor and voltage transformer (VT) are connected with the digital signal controller in distribution terminal 10.Communication module, alarm module, display module are connected with respectively photo-coupler, and the other end of photo-coupler is connected with digital signal controller.Digital signal controller is also connected with the travel switch of the dynamic and static Contact Breaking/Making Operations state of monitoring in load switch body, is provided with photo-coupler between it.
During monitoring system work of the present invention, the current transformer in load switch body, voltage transformer (VT) and over travel sensor send digital signal controller to as analog input.Definite value scrambler input value in distribution terminal, on off state value, breaking current time numerical value and energy storage state value as digital quantity, input sends digital signal controller to.Communication module is connected with digital signal controller by fieldbus, meanwhile, by fieldbus or wireless network and backstage main website, carries out real-time communication.The controlled quentity controlled variable output signal of digital signal controller acts on quiet, the moving contact of on-load switch, makes it to carry out breaking-closing operating.The alarm control signal of digital signal controller, state show that controlled quentity controlled variable output valve acts on respectively alarm module and display module, the alarm that alarm module adopts can comprise buzzing warning, sound and light alarm, and data disaply moudle comprises LED state pilot lamp, LCD LCDs etc.
In real work, it is the DSC chip of STM32f407VG that central processor CPU can adopt model, the internal resource of chip is a lot, memory capacity is large, low price, ARM chip has wireless communication interface, ethernet interface simultaneously, also can produce PWM ripple, can fast processing and output analog quantity, digital quantity, control signal, alerting signal etc.Control signal, alerting signal output are increased to TLP112 light-coupled isolation, guarantee stability and the anti-interference of output signal.Simultaneously, adopt the H7710 series communication module of Hong electricity company, distribution terminal can send to user mobile phone alerting signal by gsm communication mode again by swap data between GPRS communication mode and main website, has the local communication of RS232/RS485 and maintenance interface simultaneously.
Fig. 4 is the monitoring of on-load switch residual electricity life-span and the method for early warning criterion schematic diagram of the embodiment of the present invention.The criterion in on-load switch residual electricity life-span comprises data and the intrinsic life value of on-load switch that each sensor in distribution terminal records.Each sensor records the real time data of on-load switch inside and sends to central processor CPU to compare, calculate, data after processing will send backstage main website to, monitor staff by backstage main website monitors in real time by data, when generation on-load switch electric life finishes to report to the police, send in time maintainer to remove on-the-spot replacing on-load switch, provide user to serve.
As shown in the figure, concrete computing method complete in the central processor CPU of distribution terminal, comprise the following steps:
The intrinsic electric life of known on-load switch closes short-circuit current number of times is S;
When switch moves, the digital signal controller statistics in distribution terminal closes short-circuit current frequency n;
When switch moves, distribution terminal is by current transformer measuring circuit current value, comprise A phase current mutual inductor, B phase current mutual inductor, C phase current mutual inductor and zero sequence current mutual inductor, when detecting the current value obtaining, current transformer is greater than setting current value, distribution terminal starts to add up and adds up current time t1, when accumulative total current time t1 reaches threshold values W, switch degree of wear M1 increases once, current time t1 zero clearing, digital signal controller is converted to switch by switch degree of wear M1 and closes short-circuit current number of times, M1 is increased to certain value, closing short-circuit current frequency n 1 increases by 1 time, the M1 zero clearing of the switch degree of wear also restarts accumulation,
When the each separating brake of switch, combined floodgate, distribution terminal detection load switch is from i.e. arcing or the arc time of quiet, moving contact of the electric current generation time t2 of the separating brake that closes a floodgate, digital signal controller is converted to switch electrical wear degree M2 by electric current generation time t2, when t2 reaches certain threshold values, M2 cumulative rises 1 time, t2 zero clearing also restarts accumulation, digital signal controller is converted to switch by switch degree of wear M2 and closes short-circuit current number of times, M2 is increased to certain value, closing short-circuit current frequency n 2 increases once, and the M2 zero clearing of the switch degree of wear also restarts accumulation;
Conventionally the intrinsic electric life of on-load switch is 5 times;
The residual electricity life-span of digital signal controller calculated load switch: N=5-n-n1-n2;
When N=0, switch has been finished its electric life, produces alerting signal, and send to alarm module by distribution terminal.
In addition, the residual electricity life-span of on-load switch is also passed through elasticity electrical wear amount L as criterion, and its step comprises:
On-load switch closes a floodgate at every turn, during separating brake, distance quiet, that moving contact Contact flicks again due to inertia is elasticity electrical wear amount L; Elasticity electrical wear amount L while using over travel sensor to record each switch motion, when elasticity electrical wear amount L<0.5mm, digital signal controller judgement switch has been finished its electric life, distribution terminal produces alerting signal, and send to alarm unit, alerting signal is sent to backstage main website simultaneously.
On-load switch residual electricity life-span monitoring of the present invention and method for early warning, comprise that the damage that on-load switch electric current is transfinited is converted into electric life and elasticity electrical wear amount is monitored the on-load switch life-span as criterion two aspects, science, rationally more, the meaning with double insurance, to user's applied load switch in electrical network, main facilities, provide reliable foundation, can avoid by losses such as the improper fire causing of on-load switch Endurance Prediction, electric shocks.
Above embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention, all should fall in the definite protection domain of claims of the present invention.
Claims (10)
1. an on-load switch electric service life monitor system, comprise load switch body, distribution terminal (10), communication module and backstage main website, described load switch body comprises the entrance bushing (1) setting gradually from left to right, moving contact (8), (5) are flexible coupling, vacuum interrupter (6), static contact (7), current transformer (4), outlet casing tube (2), between described entrance bushing (1) and moving contact (8), along on-load switch inwall, be provided with voltage sensor (3), described be flexible coupling (5) are connected between moving contact (8) and disconnector (11), describedly enter, outlet casing tube (1, 2) connection line mains side and load side, described on-load switch is reliably connected with described distribution terminal (10) with cable by aviation plug, it is characterized in that,
Described distribution terminal (10) inside is provided with digital signal controller;
Described load switch body inside is provided with over travel sensor (9), and is positioned between quiet, moving contact (7,8);
The inner digital signal controller of described distribution terminal (10) is connected with described current transformer (4), over travel sensor (9), voltage transformer (VT) (3) and described communication module.
2. on-load switch electric service life monitor system according to claim 1, is characterized in that,
Described backstage main website is connected with described distribution terminal (10), and can intercom mutually;
Described backstage main website is long-distance intelligent machine terminal;
Described communication module comprises wireless GPRS/gsm communication module and RS232/485 communication module, and it is communicated by letter by wireless network mode or fieldbus mode with described backstage main website.
3. on-load switch electric service life monitor system according to claim 2, is characterized in that,
Also comprise photo-coupler, alarm module, display module;
Between the digital signal controller of described distribution terminal (10) and described warning, described display module, described communication module, by photo-coupler, be connected.
4. on-load switch electric service life monitor system according to claim 3, is characterized in that,
It is the DSC chip of STM32f407VG that described digital signal controller can adopt model;
Described photo-coupler adopts high light velocity photo-coupler TLP112;
Described communication module adopts the H7710 series communication module of Hong electricity company;
Described alarm module comprises alarm;
Described display module comprises display lamp or display screen.
5. a method of utilizing the arbitrary described on-load switch electric service life monitor system of claim 1-4 to carry out the measuring and calculating of on-load switch electric life, is characterized in that comprising the following steps:
Step 1, the absolute wear extent of calculated load switch electric life;
Step 2, the relative electrical wear amount of calculated load switch electric life;
Step 3, the elasticity electrical wear amount of calculated load switch;
Step 4, the calculated load switch residual electricity life-span;
Step 5, in the assessment on-load switch residual electricity life-span, sends it to corresponding display module or remote monitoring end;
Step 6, according to the assessed on-load switch residual electricity life-span, corresponding initiation is reported to the police or is sent it back corresponding steering order by remote monitoring end.
6. a method of utilizing on-load switch electric life measuring and calculating described in claim 5, is characterized in that:
The absolute wear extent of described on-load switch electric life closes short-circuit current number of times while being on-load switch work;
Described on-load switch electric life relative wear amount comprises: in circuit, current value exceeds the time of setting threshold values, the electrical wear amount that during on-load switch separating brake, arcing or arc time accumulative total change into;
The distance that described on-load switch elasticity electrical wear amount (L) is quiet when the on-load switch separating brake, moving contact Contact flicks again due to inertia and setpoint distance constant poor.
7. a method of utilizing on-load switch electric life measuring and calculating described in claim 6, is characterized in that comprising the following steps:
The intrinsic electric life of known on-load switch (S), in calculating in the on-load switch residual electricity life-span, choose following data as criterion:
In on-load switch when work, closes short-circuit current number of times (n), and current value during on-load switch work in circuit surpasses sets the overtime (t1) of threshold values in advance, arcing or the arc time (t2) of quiet during on-load switch separating brake, moving contact (7,8);
Overtime (t1) and arcing or arc time (t2) are converted to the dynamic and static contact abrasion degree of on-load switch by certain algorithm, to close short-circuit current time number scale;
The on-load switch residual electricity life-span be original life (S) deduct that overtime (t1) and arcing or arc time (t2) change into close short-circuit current number of times;
When the on-load switch residual electricity life-span is 0 time, digital signal controller produces alerting signal, and sends to alarm module, and the alarm of described alarm module starts reports to the police;
Meanwhile, digital signal controller sends the data to communication module, and communication module sends to backstage main website by alerting signal by local bus or wireless network.
8. on-load switch electric life measuring method according to claim 7, is characterized in that,
When switch moves at every turn, described quiet, moving contact (7,8) Contact is because inertia flicks certain distance again, while using described over travel sensor (9) to record each switch motion, flicking distance for elasticity electrical wear amount (L);
Described digital signal controller reads the elasticity electrical wear amount (L) that over travel sensor (9) records;
Elasticity electrical wear amount (L) is less than while setting threshold values, and digital signal controller produces alerting signal, and sends to alarm module;
The alarm of described alarm module starts reports to the police;
Meanwhile, digital signal controller sends the data to communication module, and communication module sends to backstage main website by alerting signal by local bus or wireless network.
9. on-load switch electric life measuring method according to claim 8, is characterized in that following steps:
The intrinsic electric life of known described on-load switch is and closes short-circuit current number of times (S);
When switch moves, described distribution terminal (10) statistics closes short-circuit current number of times (n);
When switch moves, described distribution terminal is by described current transformer measuring circuit current value (A);
When described current transformer detects the current value (A) obtaining, be greater than setting current value, described digital signal controller starts to add up the electric current overtime (t1);
When accumulative total current time reaches certain value, switch degree of wear M1 increases once, (t1) zero clearing of electric current overtime;
Switch degree of wear M1 is converted to on-load switch and closes short-circuit current number of times, it is increased to certain value, and closing short-circuit current frequency n 2 increases by 1 time, and the M1 zero clearing of the switch degree of wear also restarts accumulation;
During the each separating brake of switch, distribution terminal (10) detection load switch is from current vanishes time of the separating brake that closes a floodgate i.e. arcing or the arc time (t2) of quiet, moving contact;
Accumulation arcing or arc time (t2) are converted to switch electrical wear degree M2, when it reaches certain value, and switch electrical wear degree M2 cumulative rises 1 time, (t2) zero clearing of arcing or arc time also restarts accumulation;
Switch degree of wear M2 is converted to switch and closes short-circuit current number of times, it is increased to certain value, and closing short-circuit current frequency n 2 increases once, and the M2 zero clearing of the switch degree of wear also restarts accumulation;
The residual electricity life-span of the digital signal controller calculated load switch of described distribution terminal: N=S-n-n1-n2;
When N=0, switch has been finished its electric life, sends alerting signal, and send alarm module to by the digital signal controller of distribution terminal;
Described distribution terminal (10) sends alerting signal to backstage main website simultaneously.
10. on-load switch electric life measuring method according to claim 9, is characterized in that,
Described distribution terminal is by swap data between GPRS communication mode and main website;
Described distribution terminal also sends to user mobile phone by gsm communication mode alerting signal, has RS232/RS485 local communication function simultaneously.
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