CN105116818B - Monitoring method and system of alternating current contactor - Google Patents
Monitoring method and system of alternating current contactor Download PDFInfo
- Publication number
- CN105116818B CN105116818B CN201510420187.5A CN201510420187A CN105116818B CN 105116818 B CN105116818 B CN 105116818B CN 201510420187 A CN201510420187 A CN 201510420187A CN 105116818 B CN105116818 B CN 105116818B
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- contact
- contactor
- current
- voltage
- state information
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000012423 maintenance Methods 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 2
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000004378 air conditioning Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention provides a monitoring method and a system of an alternating current contactor, comprising the following steps: current detection means for detecting a current flowing through a contact of the ac contactor; voltage detection means for detecting a voltage between the contacts when the contacts are opened; the contact detection device is used for detecting the closing and opening of the contact so as to obtain the closing and opening times of the contact; the controller obtains the current state information of the alternating current contactor according to the voltage between the contacts when the contacts are disconnected, the current flowing through the contacts before the contacts are disconnected, the times of closing and opening of the contacts and historical test data, and displays the current state information to a user, so that the user can know the state of the alternating current contactor in time, the long-term operation with faults of the alternating current contactor is reduced, and the stability of the system is improved.
Description
Technical field
The present invention relates to air-conditioning technical field, more specifically to the monitoring method and system of a kind of A.C. contactor.
Background technology
A.C. contactor is a kind of control device of automation, for controlling load-carrying circuit or Large Copacity control circuit
Switch on and off.Due to A.C. contactor have the advantages that can remote operation, can frequent operation and control capability it is big, because
This, A.C. contactor has been widely used in various automatic control circuits and household electrical appliance.
But because user can not learn the state of A.C. contactor when using household electrical appliance or control system, therefore,
Once not finding the failure of A.C. contactor in time, cause A.C. contactor to operate with failure for a long time, peace will be brought to user
Full hidden danger, it can also influence the stability of household electrical appliance or control system operation.
The content of the invention
In view of this, the invention provides a kind of monitoring method of A.C. contactor and system, in the prior art can not
The running status of A.C. contactor is known in time, is caused A.C. contactor to operate with failure for a long time, is influenceed household electrical appliance or control
The problem of system run all right.
To achieve the above object, the present invention provides following technical scheme：
A kind of monitoring system of A.C. contactor, including：
Current sensing means, the current sensing means are arranged on the end of incoming cables of A.C. contactor, and institute is flowed through for detecting
State the electric current of the contact of A.C. contactor；
Voltage check device, the voltage check device are arranged on any end of incoming cables of the A.C. contactor and to loads
Between end, for detecting the voltage when contact disconnects between the contact；
Contact detection device, the contact detection device are arranged on the path of the contact, for detecting the contact
Closed and disconnected, with obtain the contact closure and disconnect number；
The controller being connected with the current sensing means, voltage check device and contact detection device, the controller
Voltage, the contact when being disconnected according to the contact between the contact flow through the electric current of the contact, the contact before disconnecting
Closed and disconnected number and historical test data, obtain the current state information of the A.C. contactor, and will described in
Current state information is shown to user.
Preferably, the current sensing means is current sensor；The voltage check device is voltage sensor；It is described
Contact detection device is proximity switch.
Preferably, the A.C. contactor is three-phase ac contactor, and the monitoring system comprises at least three electric currents
Detection means；The A.C. contactor is single phase ac contactor, and the monitoring system comprises at least a current detecting and filled
Put.
Preferably, the historical test data includes test data A.C. contactor at different operating conditions；It is described
The current state information of A.C. contactor includes the residual life and contact wear information of the A.C. contactor.
Preferably, the controller is additionally operable to judge whether the residual life of the A.C. contactor is less than setting value, if
It is then to control alarm module to send alarm, to remind user to change A.C. contactor in time.
Preferably, the controller is additionally operable to determine maintenance project according to the current state information, and by the maintenance
Plan is shown to user.
Preferably, in addition to the controller display module being connected, the display module are used to show the exchange
The current state information and maintenance project of contactor.
A kind of monitoring method of A.C. contactor, including：
Detection flows through the electric current of the contact of A.C. contactor；
Detect the voltage between the contact when contact disconnects；
The closed and disconnected of the contact is detected, with the number for obtaining the contact closure and disconnecting；
Voltage when being disconnected according to the contact between the contact, the contact flowed through before disconnecting the contact electric current,
The number and historical test data of the closed and disconnected of the contact, the current state information of the A.C. contactor is obtained,
And the current state information is shown to user.
Preferably, in addition to：
Judge whether the residual life of the A.C. contactor is less than setting value；
If so, then control alarm module sends alarm, to remind user to change A.C. contactor in time.
Preferably, in addition to：
Maintenance project is determined according to the current state information, and the maintenance project is shown to user.
Compared with prior art, technical scheme provided by the present invention has advantages below：
The monitoring method and system of A.C. contactor provided by the present invention, electricity when being disconnected according to ac contactor contact
Electric current, the number and historical test data of closed and disconnected before pressure, disconnection, the current state information of A.C. contactor is obtained,
And current state information is shown to user, so as to make user recognize the state of A.C. contactor in time, reduce exchange
The long-term of contactor operates with failure, and improves the stability of system, also, can also reduce work of the user in regular maintenance
Amount.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of monitoring system for three-phase ac contactor that one embodiment of the present of invention provides；
Fig. 2 is a kind of monitoring system for single phase ac contactor that one embodiment of the present of invention provides；
Fig. 3 is the flow chart of the monitoring method for the A.C. contactor that an alternative embodiment of the invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
An embodiment provides a kind of monitoring system of A.C. contactor, with air-conditioning system in the present embodiment
In A.C. contactor exemplified by illustrate, the structure of the A.C. contactor is identical with existing structure, will not be repeated here.
It is a kind of monitoring system of three-phase ac contactor with reference to figure 1 and Fig. 2, Fig. 1, Fig. 2 is a kind of monitoring of single phase ac contactor
System.
The monitoring system that the present embodiment provides includes current sensing means 10, voltage check device 20, contact detection device
30 and controller 40, certainly, the monitoring system also includes display module 50, and alternatively, the display module 50 can be air-conditioning
Line control machine of system etc., i.e., using the remote control equipment of air-conditioning system as interactive interface.
Wherein, current sensing means 10 is preferably current sensor, and the current sensing means 10 is arranged on control ac contactor
Device KM end of incoming cables, for detecting the electric current for the contact for flowing through the A.C. contactor KM.With reference to figure 1, as A.C. contactor KM
For three-phase ac contactor when, the monitoring system comprises at least three current sensing means 10, i.e. each phase L1, L2 and L3
On be both provided with a current sensing means 10；With reference to figure 2, when A.C. contactor KM is single phase ac contactor, the monitoring
System comprises at least a current sensing means 10, and the current sensing means 10 is arranged on a single phase L, so as to
The electric current for flowing through each contacts of A.C. contactor KM is detected by current sensing means 10.
Voltage check device 20 is preferably voltage sensor, and the voltage check device 20 is arranged on the A.C. contactor KM
One of mutually as on L3, i.e., any end of incoming cables and between load end, for detecting the contact when contact disconnects
Voltage, that is, detect voltage check device 20 corresponding to contact stationary contact and movable contact between voltage.Voltage check device
20 when detecting the voltage that contact disconnects, and can obtain the undulating value of voltage in several milliseconds, voltage check device 20 can by its with
Magnitude of voltage after contact disconnection is stable is contrasted, and obtains magnitude of voltage during this contact tripping.
Contact detection device 30 is preferably close to switch, and the proximity switch is arranged on the path of the contact, for examining
Survey the closed and disconnected of the contact.When being disconnected and closed due to contact, movable contact stationary contact can move relatively, therefore, set
Proximity switch between movable contact and stationary contact on path is able to detect that the motion of movable contact.
Controller 40 and current sensing means 10, voltage check device 20, contact detection device 30 and display module 50
It is connected.When contact detection device 30 detects once disconnection and the closure of contact, it is used to record posting for number in controller 40
Storage adds 1, and the voltage of the contact, the contact flow through described touch when then controller 40 disconnects according to the contact before disconnecting
The number and historical test data of the electric current of point, the closed and disconnected of the contact, obtain the current of the A.C. contactor
Status information, and the current state information is shown to user.Wherein, historical test data includes A.C. contactor KM not
With the test data under service condition；A.C. contactor KM current state information includes the remaining longevity of the A.C. contactor KM
Life and contact wear information.
Specifically, the Current calculation of contact is flowed through before the voltage and disconnection when controller 40 can disconnect according to contact between contact
Go out the energy rank this time disconnected between contact, by energy rank energy i.e. different from the historical test data stored in database
The test data of the not corresponding contact wear degree of magnitude is compared, and judges this time to disconnect the mill to A.C. contactor KM contacts
Damage degree, and obtain the wear information of the contact；
Also, controller 40 can also test number according to the history stored in the opening and closing of number in contact and database
According to the difference of i.e. A.C. contactor KM total electric life frequency table, show that the remaining access times i.e. residual life of the contact is believed
Breath；
Afterwards, controller 40 sends the wear information of the contact and residual life information etc. to display module 50, leads to
Display module 50 is crossed by these presentation of information to user, so that user understands A.C. contactor KM operation information in time, is avoided
The stability of its influence system that operates with failure for a long time.
Wherein, fuzzy Judgment can be carried out to the degree of wear of slider material according to energy, is such as calculated by voltage and current
The energy gone out is too high, then slider material radiating can be caused uneven, and then causes slider material to damage, for example, contact
When material is copper, the fusing point of copper is 2000 DEG C, and copper product bears the high voltage of 5ms times under normal circumstances, can produce normal mill
Damage, 10ms high voltage is born, heavy wear can be produced, also, more can more accelerated to later stage abrasion, based on this, according to energy
The degree of contact wear is can determine whether, and then judges the remaining usage time of contact.
In addition, the controller 40 in the present embodiment can also formulate maintenance meter according to A.C. contactor KM current state information
Draw, and maintenance project is shown to by user by display module 50.For example, controller 40 can be according to A.C. contactor KM abrasion
Situation and residual life information provide rational maintenance project, such as service free, need how long to be maintained or changed.
After general user has fixed maintenance period, controller 40 to obtain A.C. contactor KM remaining usage time,
Remind user to be maintained or changed within a certain period of time A.C. contactor, avoid A.C. contactor KM damage power-off.Also, work as
When replacing construction or residue degree are less than setting value, controller 40 can control sound and light alarm module to send alarm, to remind user
A.C. contactor is changed in maintenance in time.
The monitoring system for the A.C. contactor that the present embodiment provides, it is voltage when being disconnected according to ac contactor contact, disconnected
The number and historical test data of electric current, closed and disconnected before opening, the current state information of A.C. contactor is obtained, and will
Current state information is shown to user, so as to make user recognize the state of A.C. contactor in time, reduces ac contactor
The tape jam longtime running of device, the stability of system is improved, also, user is not required to oneself and formulates maintenance project etc., so as to
Enough reduce workload of the user in regular maintenance.
An alternative embodiment of the invention provides a kind of monitoring method of A.C. contactor, with reference to figure 3, including：
S301：Detection flows through the electric current of the contact of A.C. contactor；
The monitoring that the monitoring system that the monitoring method of A.C. contactor in the present embodiment uses provides with above-described embodiment
System is identical, and the monitoring system includes being arranged on the current sensing means of the end of incoming cables of A.C. contactor, is arranged on ac contactor
In one of phase of device be any end of incoming cables and to the voltage check device between load end, be arranged on the path of contact
Contact detection device and the controller being connected with current sensing means, voltage check device, contact detection device, so as to pass through
The electric current of the detectable each contact for flowing through A.C. contactor of current sensing means.
S302：Detect the voltage between the contact when contact disconnects；
By detecting the detectable corresponding voltage between stationary contact and movable contact of voltage check device.Voltage check device
When detecting the voltage that contact disconnects, the undulating value of voltage can be obtained in several milliseconds, voltage check device can be by itself and contact
Disconnect the magnitude of voltage after stabilization to be contrasted, obtain magnitude of voltage during this contact tripping.
S303：The closed and disconnected of the contact is detected, with the number for obtaining the contact closure and disconnecting；
Contact detection device is preferably close to switch, and the proximity switch is arranged on the path of the contact, for detecting
The closed and disconnected of the contact.When contact detection device detects once disconnection and the closure of contact, it is used in controller
The register of record number adds 1, it is hereby achieved that the contact closure and the number disconnected.
S304：Voltage, the contact when being disconnected according to the contact between the contact flow through the contact before disconnecting
Electric current, the contact closed and disconnected number and historical test data, obtain the current state of the A.C. contactor
Information, and the current state information is shown to user.
Specifically, the galvanometer that contact is flowed through before the voltage and disconnection when controller can disconnect according to contact between contact calculates
This time disconnect the energy rank between contact, the historical test data i.e. different-energy that will be stored in the energy rank and database
The test data of contact wear degree is compared corresponding to rank, judges this time to disconnect the abrasion journey to ac contactor contact
Degree, and obtain the wear information of the contact；
Also, controller can also be according to the historical test data stored in the opening and closing of number in contact and database
That is the difference of total electric life frequency table of A.C. contactor, the remaining access times i.e. residual life information of the contact is drawn；
Afterwards, controller sends the wear information of the contact and residual life information etc. to display module, by aobvious
Show that these presentation of information to user, so that user understands the operation information of A.C. contactor in time, are avoided its long-term band by module
Failure operation influences the stability of system.
In addition, the monitoring method of the A.C. contactor in the present embodiment also includes：
Judge whether the residual life of the A.C. contactor is less than setting value；
If so, then control alarm module sends alarm, to remind user to change A.C. contactor in time.
The monitoring method of A.C. contactor in the present embodiment also includes：
Maintenance project is determined according to the current state information, and the maintenance project is shown to user.
The monitoring method for the A.C. contactor that the present embodiment provides, it is voltage when being disconnected according to ac contactor contact, disconnected
The number and historical test data of electric current, closed and disconnected before opening, the current state information of A.C. contactor is obtained, and will
Current state information is shown to user, so as to make user recognize the state of A.C. contactor in time, reduces ac contactor
The tape jam longtime running of device, improves the stability of system, also, can also reduce work of the user in regular maintenance
Amount.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
- A kind of 1. monitoring system of A.C. contactor, it is characterised in that including：Current sensing means, the current sensing means are arranged on the end of incoming cables of A.C. contactor, and the friendship is flowed through for detecting Flow the electric current of the contact of contactor；Voltage check device, the voltage check device be arranged on the A.C. contactor any end of incoming cables and to load end it Between, for detecting the voltage when contact disconnects between the contact；Contact detection device, the contact detection device are arranged on the path of the contact, for detecting closing for the contact Close and disconnect, with the number for obtaining the contact closure and disconnecting；The controller being connected with the current sensing means, voltage check device and contact detection device, the controller according to Voltage, the contact when contact disconnects between the contact flow through the electric current of the contact before disconnecting, the contact is closed The number and historical test data for closing and disconnecting, the current state information of the A.C. contactor is obtained, and will be described current Status information is shown to user.
- 2. system according to claim 1, it is characterised in that the current sensing means is current sensor；The electricity Pressure detection means is voltage sensor；The contact detection device is proximity switch.
- 3. system according to claim 1, it is characterised in that the A.C. contactor is three-phase ac contactor or list Cross streams contactor, when the A.C. contactor is three-phase ac contactor, the monitoring system comprises at least three electric currents Detection means；When the A.C. contactor is single phase ac contactor, the monitoring system comprises at least a current detecting Device.
- 4. system according to claim 1, it is characterised in that the historical test data includes A.C. contactor in difference Test data under service condition；The current state information of the A.C. contactor includes the residual life of the A.C. contactor And contact wear information.
- 5. system according to claim 4, it is characterised in that the controller is additionally operable to judge the A.C. contactor Whether residual life is less than setting value, if so, then control alarm module sends alarm, to remind user to change ac contactor in time Device.
- 6. system according to claim 1, it is characterised in that the controller is additionally operable to according to the current state information Maintenance project is determined, and the maintenance project is shown to user.
- 7. according to the system described in any one of claim 1~6, it is characterised in that also include being connected with the controller shows Show module, the display module is used for the current state information and maintenance project for showing the A.C. contactor.
- A kind of 8. monitoring method of A.C. contactor, it is characterised in that including：Detection flows through the electric current of the contact of A.C. contactor；Detect the voltage between the contact when contact disconnects；The closed and disconnected of the contact is detected, with the number for obtaining the contact closure and disconnecting；Voltage when being disconnected according to the contact between the contact, the contact flow through the electric current, described of the contact before disconnecting The number and historical test data of the closed and disconnected of contact, the current state information of the A.C. contactor is obtained, and will The current state information is shown to user.
- 9. according to the method for claim 8, it is characterised in that also include：Judge whether the residual life of the A.C. contactor is less than setting value；If so, then control alarm module sends alarm, to remind user to change A.C. contactor in time.
- 10. according to the method for claim 8, it is characterised in that also include：Maintenance project is determined according to the current state information, and the maintenance project is shown to user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510420187.5A CN105116818B (en) | 2015-07-16 | 2015-07-16 | Monitoring method and system of alternating current contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510420187.5A CN105116818B (en) | 2015-07-16 | 2015-07-16 | Monitoring method and system of alternating current contactor |
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| CN105116818A CN105116818A (en) | 2015-12-02 |
| CN105116818B true CN105116818B (en) | 2018-01-16 |
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| CN201510420187.5A Active CN105116818B (en) | 2015-07-16 | 2015-07-16 | Monitoring method and system of alternating current contactor |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106774103A (en) * | 2016-11-20 | 2017-05-31 | 广西大学 | A kind of A.C. contactor electronic information acquisition system |
| CN106546860A (en) * | 2016-12-09 | 2017-03-29 | 中国恩菲工程技术有限公司 | Cancel the monitoring system and monitoring method of catalyst monitoring in control system |
| CN106959416A (en) * | 2017-04-25 | 2017-07-18 | 深圳供电局有限公司 | Low-voltage contactor contact state online monitoring device and method |
| CN107728049A (en) * | 2017-09-20 | 2018-02-23 | 昆山国力源通新能源科技有限公司 | The detection method of D.C. contactor service life |
| KR102248533B1 (en) | 2017-09-29 | 2021-05-04 | 주식회사 엘지화학 | System and method for predicting the failure rate of contactor |
| CN111799762A (en) * | 2020-05-27 | 2020-10-20 | 河北新天科创新能源技术有限公司 | Wind turbine generator set and method for preventing engine room of fan from being on fire |
| CN114047437A (en) * | 2021-11-09 | 2022-02-15 | 中车青岛四方机车车辆股份有限公司 | Contactor state detection method, system and device and railway vehicle |
| CN115891876B (en) * | 2022-12-19 | 2024-10-18 | 中国重汽集团济南动力有限公司 | Control method and control equipment of distribution box, distribution box and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000501228A (en) * | 1995-12-01 | 2000-02-02 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for monitoring burnout of contact piece in switchgear |
| WO2004057633A1 (en) * | 2002-12-20 | 2004-07-08 | Siemens Aktiengesellschaft | Method for determining the remaining service life of a switching device and corresponding assembly |
| CN103018667A (en) * | 2012-12-11 | 2013-04-03 | 福州大学 | Characteristic test analysis system for alternating current contactor |
| CN104345270A (en) * | 2014-11-23 | 2015-02-11 | 哈尔滨理工大学 | On-line electric switch contact health state monitoring and early warning system |
| CN104733227A (en) * | 2013-12-18 | 2015-06-24 | 苏州御能动力科技有限公司 | Alternating-current contactor protection device and protection method thereof |
-
2015
- 2015-07-16 CN CN201510420187.5A patent/CN105116818B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000501228A (en) * | 1995-12-01 | 2000-02-02 | シーメンス アクチエンゲゼルシヤフト | Method and apparatus for monitoring burnout of contact piece in switchgear |
| WO2004057633A1 (en) * | 2002-12-20 | 2004-07-08 | Siemens Aktiengesellschaft | Method for determining the remaining service life of a switching device and corresponding assembly |
| CN103018667A (en) * | 2012-12-11 | 2013-04-03 | 福州大学 | Characteristic test analysis system for alternating current contactor |
| CN104733227A (en) * | 2013-12-18 | 2015-06-24 | 苏州御能动力科技有限公司 | Alternating-current contactor protection device and protection method thereof |
| CN104345270A (en) * | 2014-11-23 | 2015-02-11 | 哈尔滨理工大学 | On-line electric switch contact health state monitoring and early warning system |
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| CN105116818A (en) | 2015-12-02 |
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