CN203688763U - Electric life monitoring system for load switch - Google Patents
Electric life monitoring system for load switch Download PDFInfo
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- CN203688763U CN203688763U CN201320833878.4U CN201320833878U CN203688763U CN 203688763 U CN203688763 U CN 203688763U CN 201320833878 U CN201320833878 U CN 201320833878U CN 203688763 U CN203688763 U CN 203688763U
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Abstract
The utility model discloses an electric life monitoring system for a load switch. The electric life monitoring system for the load switch comprises the load switch and a distribution terminal. The load switch comprises an inlet-and-outlet wire bushing, a phase current transformer, a zero sequence current transformer, a vacuum explosion chamber, a static contact, a moving contact, a voltage transformer and an isolation switch. The load switch is reliably connected with the distribution terminal through an aviation plug and a cable conductor. An overtravel sensor is arranged in the load switch body and between the static contact and the moving contact. A control chip arranged in the distribution terminal is connected to the phase current transformer, the zero sequence current transformer, the overtravel sensor and the voltage transformer in the load switch body, and is connected to an alarming module. The sensor in the load switch sends according data in real time to the distribution terminal. The distribution terminal calculates the residual electric life of the load switch by the chip, and an alarming device is started when the residual electric life is zero.
Description
Technical field
The utility model relates to a kind of monitoring system, relates in particular to a kind of electric service life monitor system.
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, the effect of play the operation monitoring to distribution network line and quick judgement, the location to faulty line, isolating and restore electricity is used widely in electric system power transmission and distribution.But, 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, wear oxidation etc. in on-load switch, if maintenance or replacing switchgear not in time, 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.Exceed the specified number of times while dispatching from the factory if on-load switch in use closes short-circuit current number of times, 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.But 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, goes to judge that with intrinsic electric life the on-load switch residual electricity life-span is insecure.
For example, be short-circuited after fault at a certain secondary line, 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 be short-circuited after fault at a certain secondary line 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, must take certain means to consider the correlatives such as intrinsic electric life, circuit running current size, arcing or arc time, the over travel of on-load switch and go the comprehensive monitoring on-load switch residual electricity life-span.
Utility model content
The purpose of this utility model is to provide a kind of on-load switch electric service life monitor system.
For achieving the above object, the utility model provides a kind of on-load switch electric service life monitor system, comprises 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 in on-load switch inside, 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.
Utilize a kind of on-load switch electric service life monitor system of the utility model to carry out on-load switch electric life and measure the method for monitoring, comprise the 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 when 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.
In said method, distribution terminal can, by swap data between GPRS communication mode and main website, can send to user mobile phone alerting signal by gsm communication mode again, has RS232/RS485 local bus communication interface simultaneously.
By on-load switch residual electricity life monitoring system of the present utility model, 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 utility model;
Fig. 2 is distribution terminal schematic diagram of the present utility model;
Fig. 3 is the principle schematic of on-load switch residual electricity life-span monitoring and warning of the present utility model;
Fig. 4 is the method for early warning schematic diagram of on-load switch residual electricity life monitoring system of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail:
Shown in figure 1, the on-load switch residual electricity life monitoring system of the utility model embodiment 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, be provided with voltage sensor 3 along on-load switch inwall, described in be flexible coupling and 5 be connected between moving contact 8 and disconnector 11.Entrance bushing 1 and outlet casing tube 2 mains side and the load side of connected load Switch main body respectively, 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 guarantee switch motion under vacuum environment time.
Fig. 2 is distribution terminal schematic diagram of the present utility model.
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 in the time of separating brake, combined floodgate and fault that can Real-Time Monitoring transmission line of electricity closes short-circuit current number of times statistics, is responsible for and main website real-time Communication for Power simultaneously.
Fig. 3 is the on-load switch residual electricity life monitoring system schematic diagram of the utility model embodiment.
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.
When monitoring system work of the present utility model, current transformer, voltage transformer (VT) and over travel sensor in load switch body send digital signal controller to as analog input.Input sends digital signal controller to as digital quantity for definite value scrambler input value in distribution terminal, on off state value, breaking current time numerical value and energy storage state value.Communication module is connected with digital signal controller by fieldbus, meanwhile, carries out real-time communication by fieldbus or wireless network and backstage main website.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, by swap data between GPRS communication mode and main website, can send to user mobile phone alerting signal by gsm communication mode again, has the local communication of RS232/RS485 and maintenance interface simultaneously.
Fig. 4 is the method for early warning schematic diagram of the on-load switch residual electricity life monitoring system of the utility model embodiment.The criterion in on-load switch residual electricity life-span comprises data and the intrinsic life value of on-load switch that the 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 treatment will send backstage main website to, monitor staff by backstage main website monitors in real time by data, in the time that 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;
In the time that switch moves, the digital signal controller statistics in distribution terminal closes short-circuit current frequency n;
In the time that 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, in the time that 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 closing a floodgate i.e. arcing or the arc time of quiet, moving contact of the electric current generation time t2 of separating brake, electric current generation time t2 is converted to switch electrical wear degree M2 by digital signal controller, in the time that 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;
In the time of 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, when 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, in the time of elasticity electrical wear amount L<0.5mm, digital signal controller judges that 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 monitoring system of the present utility model, 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, reasonable more, there is the meaning of double insurance, provide reliable foundation to user's applied load switch in electrical network, main facilities, can avoid by the improper loss such as fire, electric shock causing of on-load switch Endurance Prediction.
Above embodiment is described preferred implementation of the present utility model; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that the common engineering technical personnel in this area make the technical solution of the utility model, all should fall in the definite protection domain of claims of the present utility model.
Claims (4)
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), be provided with voltage sensor (3) along on-load switch inwall, described be flexible coupling (5) are connected between moving contact (8) and disconnector (11), described 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, be connected by photo-coupler.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320833878.4U CN203688763U (en) | 2013-12-17 | 2013-12-17 | Electric life monitoring system for load switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320833878.4U CN203688763U (en) | 2013-12-17 | 2013-12-17 | Electric life monitoring system for load switch |
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| CN203688763U true CN203688763U (en) | 2014-07-02 |
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| CN201320833878.4U Expired - Lifetime CN203688763U (en) | 2013-12-17 | 2013-12-17 | Electric life monitoring system for load switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675667A (en) * | 2013-12-17 | 2014-03-26 | 北京合锐赛尔电力科技有限公司 | Load switch electrical endurance monitoring system and method |
-
2013
- 2013-12-17 CN CN201320833878.4U patent/CN203688763U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675667A (en) * | 2013-12-17 | 2014-03-26 | 北京合锐赛尔电力科技有限公司 | Load switch electrical endurance monitoring system and method |
| CN103675667B (en) * | 2013-12-17 | 2017-02-15 | 北京合锐赛尔电力科技股份有限公司 | Load switch electrical endurance monitoring system and method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING HERUI SEL POWER TECHNOLOGY CO., LTD. Free format text: FORMER NAME: BEIJING HERUI SEL POWER SCIENCE + TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: Advantech No. 7 building, 100085 Beijing city Haidian District on the street 5 Patentee after: BEIJING HEROSAIL POWER SCI & TECH CO., LTD. Address before: Advantech No. 7 building, 100085 Beijing city Haidian District on the street 5 Patentee before: Beijing Herui SEL Power Science & Technology Co., Ltd. |