CN103675669A - Breaker electrical endurance monitoring system and method - Google Patents
Breaker electrical endurance monitoring system and method Download PDFInfo
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- CN103675669A CN103675669A CN201310695878.7A CN201310695878A CN103675669A CN 103675669 A CN103675669 A CN 103675669A CN 201310695878 A CN201310695878 A CN 201310695878A CN 103675669 A CN103675669 A CN 103675669A
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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, relate in particular to a kind of monitoring system and monitoring method of circuit no-failure operation state.
Background technology
Isolating switch is widely used in the ring main unit of cable system and on the on-pole switch of built on stilts network, isolating switch is as the important segmentation of power distribution network backbone, boundary, contact node, play distribution network line operation monitoring, the effect that faulty line is judged fast, locates, isolated and restores electricity is used widely in electric system power transmission and distribution.Yet, isolating switch because of load impact, cut-off large electric current number of times too much or long-play is easy to reach the use electric life of isolating switch in the inferior a variety of causes of large current condition, make quiet, moving contact heating distortion in isolating 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 isolating switch, even arcing or arc time are long and cause the accidents such as isolating switch is blasted, fire.This is by the security of operation of the whole power distribution network of impact.
Isolating switch has had the development of several more than ten years at home and abroad, and isolating switch quality and performance is very reliable, and the intrinsic electric life of isolating switch is that rated short circuit current open and close times can reach 30～50 times.If isolating switch in use cut-offs short-circuit current number of times, surpassed the specified number of times while dispatching from the factory, shown that isolating switch is quiet, moving contact electrical wear has reached its operating limit value.In order to realize the monitoring in isolating switch residual electricity life-span and early warning, quiet, moving contact wear oxidation, the heating deformation extent that just need to connect isolating switch carry out Real-Time Monitoring.Yet it is inner that quiet, moving contact is positioned at switch vacuum bubbles, without good means, it is carried out to direct Real-Time Monitoring at present, can only indirectly to contact of breaker, carry out Real-Time Monitoring from affecting the basic reason of electrical contact endurance.At present, in the residual electricity life-span that domestic all switch producer just removes to judge roughly isolating switch according to intrinsic electric life, reminding user overhauls or changes switchgear in time.Yet isolating 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 isolating switch residual electricity life-span is insecure.For example, at a certain secondary line, be short-circuited after fault, isolating switch makes isolating switch long-play in large electric current environment because of operating mechanism tripping, quiet, moving contact in isolating switch has a strong impact on the use electric life of isolating switch because of heating, oxidation, distortion etc., and now electrical wear situation quiet, moving contact did not calculate among the isolating switch residual electricity life-span.
For example at a certain secondary line, be short-circuited after fault again, isolating switch carries out disjunction short-circuit current overlong time, make quiet, the arcing of moving contact, the arc time of isolating switch long, cause contact to have a strong impact on the electric life of isolating switch because of heating, oxidation, electrical wear, distortion etc., and now isolating switch residual life to successively decrease be once insecure.
Again such as isolating switch 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 isolating switch, now, surface isolating switch elasticity electrical wear has reached serviceable life, need to isolating 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 isolating switch are gone the comprehensive monitoring isolating switch residual electricity life-span.
Summary of the invention
The object of the present invention is to provide a kind of circuit breaker electrical endurance monitoring system and method, solve the technical matters that isolating switch cannot effectively be monitored serviceable life.。
For achieving the above object, the invention provides a kind of circuit breaker electrical endurance monitoring system, comprise isolating switch, distribution terminal, communication module and backstage main website.
Described isolating 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 isolating 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 can be 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 circuit breaker electrical endurance monitoring 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 circuit breaker electrical endurance monitoring system of utilizing of the present invention is carried out the method that circuit breaker electrical endurance is measured monitoring, it is characterized in that following steps:
Disjunction short-circuit current number of times when the absolute wear extent of described circuit breaker electrical endurance is isolating switch work, described circuit breaker electrical endurance relative wear amount comprises: in circuit, current value exceeds the electrical wear amount that the time cumulation of threshold values changes into of setting, the electrical wear amount that during circuit-breaker switching on-off, arcing or arc time accumulative total changes into, the distance L that quiet when described isolating switch elasticity electrical wear amount is circuit-breaker switching on-off, moving contact Contact flicks again due to inertia and setpoint distance constant poor.
A kind of circuit breaker electrical endurance monitoring system of utilizing of the present invention is carried out the method that circuit breaker electrical endurance is measured monitoring, comprises the following steps:
The intrinsic electric life S of known isolating switch, in calculating, chooses following data as criterion in the short-circuiting device residual electricity life-span:
Isolating switch when work disjunction short-circuit current times N, current value during isolating 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 circuit-breaker switching on-off, moving contact;
Overtime t1 and arcing or arc time t2 are converted to the dynamic and static contact abrasion degree of isolating switch by certain algorithm, with disjunction short-circuit current time number scale;
The isolating switch residual electricity life-span is that original life S deducts the disjunction short-circuit current number of times that overtime t1 and arcing or arc time t2 change into;
When the isolating 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 isolating switch is also passed through elasticity electrical wear amount L as criterion, and its step comprises:
Described isolating 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 when threshold values is set, digital signal controller judgement isolating switch is without the residual electricity life-span, 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 isolating 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 isolating switch residual electricity life-span and method for early warning, the reliability that can promote the intelligent level of isolating switch, the security that improves isolating switch operation, increase power supply, finally contributes to the development of intelligent distribution network.
Accompanying drawing explanation
Fig. 1 is the breaker body structural drawing of isolating switch residual electricity life-span monitor and early warning system of the present invention;
Fig. 2 is the distribution terminal schematic diagram of isolating switch residual electricity life-span monitor and early warning system of the present invention;
Fig. 3 is the principle schematic of isolating switch residual electricity life-span monitoring and warning of the present invention;
Fig. 4 is isolating 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:
Figure 1 shows that the breaker body structural representation of the embodiment of the present invention.
Breaker body comprises entrance bushing 1, zero sequence current mutual inductor 4, moving contact 7, static contact 6, vacuum interrupter 5, phase-sequence current mutual inductor 3, the outlet casing tube 2 connecting successively from left to right, also comprises the voltage transformer (VT) 9 being arranged between moving contact 7 and static contact 6.In breaker body, be full of SF6 gas.
Entrance bushing 1 and outlet casing tube 2 be mains side and the load side of connecting breaker body respectively, and phase-sequence current mutual inductor 3 and zero sequence current mutual inductor 4 are separately positioned on the circuit line of the interior outlet casing tube side of isolating switch and entrance bushing side.Breaker body also comprises over travel sensor 8, and it is arranged between static contact 6 and moving contact 7.
Fig. 2 is distribution terminal schematic diagram of the present invention, and distribution terminal 10 is electrically connected by aviation plug and cable and breaker body.In distribution terminal 10, be provided with digital signal controller, definite value scrambler, photo-coupler 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.Communication module in the present invention also can be arranged on distribution terminal inside, is responsible for and main website real-time Communication for Power.
Fig. 3 is the monitoring of isolating 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 phase-sequence current mutual inductor in breaker body, zero sequence current mutual inductor, over travel sensor and voltage transformer (VT) are connected with the digital signal controller in distribution terminal 10.The communication module of distribution terminal inside, 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 breaker body, is provided with photo-coupler between it.
During monitoring system of the present invention work, 3 three-phase phase-sequence current transformers in breaker body, 1 zero sequence current mutual inductor, 1 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 isolating 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 dsp chip of STM32f407VG that digital signal controller 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 as distribution terminal, can can alerting signal be sent to user mobile phone by gsm communication mode again by swap data between GPRS communication mode and main website, there is the local communication of RS232/RS485 and maintenance interface simultaneously.
Fig. 4 is the monitoring of isolating switch residual electricity life-span and the method for early warning criterion schematic diagram of the embodiment of the present invention.The criterion in isolating switch residual electricity life-span comprises data and the intrinsic life value of isolating switch that each sensor in distribution terminal records.Each sensor records the real time data of isolating 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 circuit breaker electrical endurance finishes to report to the police, send in time maintainer to remove on-the-spot replacing isolating switch, provide user to serve.
Concrete computing method complete in the central processor CPU of distribution terminal, comprise the following steps:
The intrinsic electric life of known isolating switch is that disjunction short-circuit current number of times is S;
When switch moves, the digital signal controller statistics disjunction short-circuit current frequency n in distribution terminal;
When switch moves, distribution terminal is by current transformer measuring circuit current value A, when detecting the current value A 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 disjunction short-circuit current number of times by switch degree of wear M1, M1 is increased to certain value, disjunction short-circuit current frequency n 1 increases by 1 time, and the M1 zero clearing of the switch degree of wear also restarts accumulation;
When the each separating brake of switch, combined floodgate, distribution terminal detects isolating switch 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 disjunction short-circuit current number of times by switch degree of wear M2, M2 is increased to certain value, disjunction 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 isolating switch is 30 times.
Digital signal controller calculates the residual electricity life-span of isolating switch: N=30-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 isolating switch is also passed through elasticity electrical wear amount L as criterion, and its step comprises:
Isolating 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.
Isolating switch residual electricity life-span monitoring of the present invention and method for early warning, comprise that the damage that circuit breaker current is transfinited is converted into electric life and elasticity electrical wear amount is monitored the isolating switch life-span as criterion two aspects, science, rationally more, the meaning with double insurance, to user, in electrical network, main facilities, use isolating switch that reliable foundation is provided, can avoid by losses such as the improper fire causing of circuit breaker electrical 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. a circuit breaker electrical endurance monitoring system, comprise breaker body, distribution terminal (10), communication module and backstage main website, described breaker body comprises the entrance bushing (1) connecting successively from left to right, zero sequence current mutual inductor (4), moving contact (7), static contact (6), vacuum interrupter (5), phase-sequence current mutual inductor (3), outlet casing tube (2), also comprise the voltage transformer (VT) (9) being arranged between moving contact (7) and static contact (6), described entrance bushing (1) and outlet casing tube (2) connection line mains side and load side, described breaker body 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 breaker body inside is provided with over travel sensor (8), and is positioned between static contact (6) and moving contact (7);
The inner digital signal controller of described distribution terminal (10) is connected with described phase-sequence current mutual inductor (3), zero sequence current mutual inductor (4), over travel sensor (8), voltage transformer (VT) (9) and described communication module.
2. circuit breaker electrical endurance monitoring system according to claim 1, is characterized in that,
Described backstage main website is connected with described distribution terminal (10) electrical connection or network;
Described backstage main website can be 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. circuit breaker electrical endurance monitoring system according to claim 2, is characterized in that,
Described circuit breaker electrical endurance monitoring system also comprises photo-coupler, alarm module, display module;
Between the inner dynamic and static contact of the digital signal controller of described distribution terminal and described alarm module, described display module, described communication module and isolating switch (6,7), by photo-coupler, be connected.
4. circuit breaker electrical endurance monitoring 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 screen, shows in real time the isolating switch residual electricity life-span.
5. a method of utilizing the arbitrary described circuit breaker electrical endurance monitoring system of claim 1-4 to carry out circuit breaker electrical endurance monitoring, is characterized in that comprising the following steps:
Step 1, calculates the absolute wear extent of circuit breaker electrical endurance;
Step 2, calculates the relative electrical wear amount of circuit breaker electrical endurance;
Step 3, the elasticity electrical wear amount of calculating isolating switch;
Step 4, calculates the isolating switch residual electricity life-span;
Step 5, in the assessment isolating switch residual electricity life-span, sends it to corresponding display module or remote monitoring end;
Step 6, according to the assessed isolating 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. the method that circuit breaker electrical endurance according to claim 5 is monitored, is characterized in that:
Disjunction short-circuit current number of times when the absolute wear extent of described circuit breaker electrical endurance is isolating switch work;
Described circuit breaker electrical endurance relative wear amount comprises: in circuit, current value exceeds and sets the some wear extent that the time cumulation of threshold values changes into, the electrical wear amount that during circuit-breaker switching on-off, arcing or arc time accumulative total change into;
The distance L that quiet when described isolating switch elasticity electrical wear amount is circuit-breaker switching on-off, moving contact Contact flicks again due to inertia and setpoint distance constant poor.
7. a method of utilizing circuit breaker electrical endurance measuring and calculating described in claim 6, is characterized in that comprising the following steps:
The intrinsic electric life of known isolating switch (S), in calculating in the short-circuiting device residual electricity life-span, choose following data as criterion:
Isolating switch when work disjunction short-circuit current number of times (n), current value during isolating 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 circuit-breaker switching on-off, moving contact;
Overtime (t1) and arcing or arc time (t2) are converted to the dynamic and static contact abrasion degree of isolating switch by certain algorithm, with disjunction short-circuit current time number scale;
The isolating switch residual electricity life-span is that original life (S) deducts the disjunction short-circuit current number of times that overtime (t1) and arcing or arc time (t2) change into;
When the isolating 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.
8. circuit breaker electrical endurance measuring method according to claim 7, is characterized in that,
When switch moves at every turn, described quiet, moving contact Contact is because inertia flicks distance (L), the elasticity electrical wear amount (L) while using described over travel sensor to record each switch motion again;
Described digital signal controller reads the elasticity electrical wear amount (L) that over travel sensor records;
When described elasticity electrical wear amount (L) is less than setting threshold values, 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;
Communication module sends to backstage main website by alerting signal by local bus or wireless network.
9. circuit breaker electrical endurance measuring method according to claim 8, is characterized in that following steps:
The intrinsic electric life of known described isolating switch is that disjunction short-circuit current number of times is (S);
When switch moves, described distribution terminal statistics disjunction short-circuit current frequency 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 switch disjunction short-circuit current number of times, and switch degree of wear M1 is increased to certain value, and disjunction short-circuit current frequency n 1 increases successively 1 time from 0, and the M1 zero clearing of the switch degree of wear also restarts accumulation;
The each separating brake of switch, while closing a floodgate, distribution terminal detects isolating switch 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 the arc time (t2) is converted to switch electrical wear degree M2, and switch electrical wear degree M2 increases by 1 time, (t2) zero clearing restart accumulation;
Switch degree of wear M2 is converted to switch disjunction short-circuit current number of times, and it is increased to certain value, and disjunction short-circuit current frequency n 2 increases once successively from 0, and the M2 zero clearing of the switch degree of wear also restarts accumulation;
The digital signal controller of described distribution terminal calculates the residual electricity life-span of isolating switch: 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 sends alerting signal to backstage main website simultaneously.
10. circuit breaker electrical endurance 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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| CN106772014A (en) * | 2016-12-30 | 2017-05-31 | 中车长春轨道客车股份有限公司 | A kind of miniature circuit breaker electric life test system and method |
| CN106872885A (en) * | 2017-01-24 | 2017-06-20 | 东莞市广安电气检测中心有限公司 | A kind of guard method of arc failure of being restriked in primary cut-out breaking test and device |
| CN105699889B (en) * | 2016-03-17 | 2018-06-05 | 国网四川省电力公司电力科学研究院 | Circuit breaker of intelligent transformer substation electrical endurance loses and the evaluation method of arc extinguishing ability |
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| CN110716133A (en) * | 2019-09-06 | 2020-01-21 | 国网浙江省电力有限公司嘉兴供电公司 | High-voltage circuit breaker fault studying and judging method based on Internet of things and big data technology |
| CN110752669A (en) * | 2019-10-29 | 2020-02-04 | 国网湖南省电力有限公司 | Circuit breaker energy storage spring abnormal state evaluation system |
| CN112098829A (en) * | 2020-09-11 | 2020-12-18 | 江苏大烨智能电气股份有限公司 | FTU-based terminal and method for monitoring service life of power distribution switch |
| CN112395772A (en) * | 2020-11-30 | 2021-02-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method, terminal and system for evaluating residual electric life of circuit breaker |
| CN112782571A (en) * | 2020-03-25 | 2021-05-11 | 天津市中力神盾电子科技有限公司 | Method, device and system for monitoring service life of circuit breaker |
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