CN203745117U - Device for dynamic testing of contact pressure of contact terminal of alternating-current contactor - Google Patents
Device for dynamic testing of contact pressure of contact terminal of alternating-current contactor Download PDFInfo
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- CN203745117U CN203745117U CN201320783745.0U CN201320783745U CN203745117U CN 203745117 U CN203745117 U CN 203745117U CN 201320783745 U CN201320783745 U CN 201320783745U CN 203745117 U CN203745117 U CN 203745117U
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Abstract
The utility model discloses a device for dynamic testing of the contact pressure of a contact terminal of an alternating-current contactor. The device comprises an upper computer and a lower computer, wherein the upper computer is an industrial control computer, the lower computer comprises a contact terminal contact pressure sensor, a charge amplifier, a signal conditioning circuit, a high-speed data acquisition card and a closing phase angle controller, and the alternating-current contactor is a testing sample. According to the utility model, the dynamic changing process of the contact pressure of the contact terminal can be directly reflected, the bouncing condition of the contact terminal can be reflected more visually, and the problem that two contacts of the same touch bridge are not synchronous when the two contacts are closed is solved, Contact pressure signals of the contact terminal can provide new data for the study of the dynamic parameters, such as the optimal closing phase angle and the like of the alternating-current contactor in the future, the intensive study of the relations between the contact pressure of the contact terminal and other parameters such as the contact resistance and the contact vibration at the contact terminal contacting moment, and the optimization design of the alternating-current contactor.
Description
Technical field:
The utility model relates to method of testing and the device of dynamic characteristic parameter in Low Voltage Electrical Apparatus, is method of testing and the device of AC contactor touch head contact Dynamic Signal specifically.
Background technology:
A.C. contactor is that a kind of turnout is large, the automatic electromagnetic device of wide application.The mechanical parameter of AC contactor touch head mainly contains the asynchronism of opening distance, the excess of stroke, contact pressure and main contact of contact etc.Contact pressure is divided into contact initial pressure and end pressure, is one of important contact parameter, and electric property is had to direct impact.In order to further investigate the relation between other parameters such as the same contact resistance of contact moment contact pressure, vibration, also must obtain its dynamic overall process.
The measuring method of AC contactor touch head contact, the eighties in last century, China's industry mainly adopted following three kinds of methods: draw paper method, light method and manometer method.Wherein draw paper method simply more generally to adopt because of detection means, light method is taken second place, and pressure gauge rule is less.The measurement result of light method is (0～1.6) % with the error of the measured value of actual measurement touch spring counter-force, is 13.3%～20.4% and draw the measuring error of paper method.Light method is the method that current measuring accuracy is higher, but slightly complicated (bulb, the wire etc. of wanting power supply, each fracture to use) of the means of measuring.Although and draw paper method means of testing easy, is subject to power that the smooth finish of thickness, intensity, the contact surface of paper, the person that draws paper execute, draws the speed of paper and draw paper the restriction of the factors such as self sensation of person, thereby error is larger.At present, the patent of domestic AC contactor touch head contact measuring technology aspect or blank.External aspect, the mensuration apparatus (number of applying for a patent JP58060230) of a kind of electromagnetic contactor contact of the eighties Jap.P. in last century contact, this mensuration apparatus is mechanical, indirectly measure the size of contact pressure by measuring the distortion of the stage clip on moving contact, this measuring method has two shortcomings, once the elasticity coefficient that is spring, error was larger originally, and this can make the measuring error of contact pressure increase; Moreover this method can only be measured initial pressure and the end pressure value of static contact, but also cannot realize for the test of the dynamic process of contact pressure.
Domestic High-Voltage Electrical Appliances field had had the patented technology (the on-line measurement device 201220715335 of contact of breaker contact, switch contact pressure checkout equipment 201210319320.4, contact of high-voltage device for pressure measurement 201110430292.9) of some contact pressure test devices in recent years.Because the separatrix of generally acknowledged in the world high and low voltage electrical equipment is that to exchange 1kV(direct current be 1500V), exchanging 1kV is High-Voltage Electrical Appliances above, 1kV and following be low-voltage electrical apparatus.For ensureing that High-Voltage Electrical Appliances have enough insulation distances, its contact physical dimension is larger; The size of rated current has determined size and the structure of its carrying object, contact, and rated current is larger, and their size is larger, otherwise can not meet the requirement of rated temperature-rise.Therefore the contact of High-Voltage Electrical Appliances and low-voltage electrical apparatus has very big difference in structure and size, the contact pressure test device of High-Voltage Electrical Appliances can comprise the physical constructions such as base plate, tautness meter, pull bar, clamping force sounding rod, and the contact installation site narrow space of low-voltage electrical apparatus, it is very little that the size of its contact proving installation can only be done.Therefore for the patented technology of these High-Voltage Electrical Appliances contact pressure tests, can only use for reference some test thinkings, also it directly cannot be applied on A.C. contactor.
Utility model content:
Can accurately not obtain the problem of AC contactor touch head contact Dynamic Signal for prior art, the utility model provides a kind of PVDF of utilization piezoelectric membrane to carry out device and the method for testing thereof of AC contactor touch head contact dynamic signal testing.It is that sensitive element has been made a kind of contact pressure transducer and measured dynamically contact pressure that this device adopts PVDF piezoelectric membrane.When test, this contact pressure transducer is fixedly sticked on to the upper surface of A.C. contactor static contact, in the time that AC contactor iron core is closed, because PVDF piezoelectric membrane is subject to the shock of moving contact, to produce corresponding charge signal, this quantity of electric charge is changed into voltage signal, through demarcating, just can test in real time, dynamically the contact signal between the dynamic and static contact of A.C. contactor.Why piezoelectric membrane can survey very small physical signalling can be experienced again significantly movablely, is that the sensor response speed that it makes because serving as reasons is exceedingly fast (ns level), can catch timely and accurately transient signal; Sensitivity is very high, and in sizable dynamic range, (0～20GPa) is all linear, much larger than the maximum contact pressure value of A.C. contactor.The thickness of PVDF piezoelectric membrane is generally 30 μ m, is easy to cutting, and the area that can do is very little, and in actual applications, the error that the thickness of sensor causes is negligible, meets the test request of contact pressure completely.Apply this measuring technology or device not only can directly reflect the dynamic changing process of contact pressure, and can reflect more intuitively the situation of contact bounce, and the problem such as asynchronism when two closings of contact of same tactile bridge.Contact pressure signal can be for studying from now on the relation between other parameters such as dynamic parameter, the same contact resistance of further investigation contact moment contact pressure, contact vibration of the A.C. contactors such as best closing phase angle, and the optimal design of A.C. contactor provides new data.
The technical solution of the utility model:
A kind of AC contactor touch head contact dynamic checkout unit, this device comprises host computer and slave computer; Host computer is industrial computer, and slave computer comprises: contact pressure transducer, charge amplifier, signal conditioning circuit, high-speed data acquisition card, closing phase angle controller; A.C. contactor is test test product;
Connected mode is: contact pressure transducer is bonded on contactor test product, and the signal output part of contact pressure transducer is connected with charge amplifier by shielding line; The output terminal of charge amplifier is connected to signal conditioning circuit by shielding line; The output terminal of signal conditioning circuit is connected with high-speed data acquisition card by shielding line; The output terminal of high-speed data acquisition card is connected with industrial computer; The output terminal of industrial computer is connected to the signal input part of closing phase angle controller, and the signal output part of closing phase angle controller is connected with A.C. contactor test product;
Described contact pressure transducer is by extension line, upper surface diaphragm, and PVDF piezoelectric membrane and lower surface diaphragm form; The upper and lower surface of PVDF piezoelectric membrane is respectively upper surface diaphragm and lower surface diaphragm, and both materials are all teflon; One end of PVDF piezoelectric membrane has extension line to be used for drawing the electric charge that piezoelectric membrane produces.
Described closing phase angle controller composition comprises voltage detecting circuit, single-chip microcomputer and combined floodgate actuator three parts; Wherein single-chip microcomputer is connected with voltage detecting circuit, combined floodgate actuator respectively, and single-chip microcomputer is connected with industrial computer, and combined floodgate actuator is connected with A.C. contactor.
In described switching-on controller, voltage detecting circuit chief component is zero-crossing comparator, and zero-crossing comparator is LM324 chip; Single-chip microcomputer is the AT89S52 type single-chip microcomputer of Atmel company; Combined floodgate actuator is powerful field effect transistor SSP17N80C.
High-speed data acquisition card is PCI-1712L type data collecting card.
The test test product of this device is A.C. contactor.
The method of testing of described AC contactor touch head contact dynamic checkout unit, comprises the following steps:
(1), when test, with insulating gel, contact pressure transducer is sticked on to the upper surface of the static contact of tested A.C. contactor, extension line is drawn from the space, top of stationary contact bracket, is incorporated into charge amplifier by piezoelectric sensor private mask line;
(2), general supply powers on, whether industrial computer program checkout modules supply voltage normal, if normal, program is carried out initialization setting to all devices;
(3), on industrial computer, set experiment parameter;
(4), industrial computer communicates by letter with slave computer phase selection phase angle controller, will close/separating brake phase angle is issued phase selection phase angle controller, and sends the steering order of close/separating brake to phase selection phase angle controller;
(5), phase selection phase angle controller receives after the order of close/separating brake, carries out close/separating brake program, controls A.C. contactor adhesive or disjunction.After close/separating brake command execution, detect the whether normal adhesive of A.C. contactor test product or disjunction, if break down, slave computer sends fault prompting to industrial computer;
(6), after phase selection phase angle controller carries out combined floodgate program, on contact pressure transducer, just have contact signal and occur, this signal through charge amplifier amplify process after input signal conditioning circuit;
(7), enter high-speed data acquisition card through signal conditioning circuit data after treatment;
(8), industrial computer control receives the data-signal that high-speed data acquisition card gathers;
(9), industrial computer shows and store test results gathered signal waveform.
The utility model compared with prior art has following main beneficial effect:
1, this device, by the whole test process of industrial computer control, can automatically, accurately complete the test of A.C. contactor dynamic characteristic measuring, has improved the automatization level of measuring test; Good man-machine interactive interface is provided, has facilitated user to test and check test findings.
2, the designed contact pressure transducer of the utility model can be used in combination with other method (device) of measuring A.C. contactor dynamic characteristic parameter, thereby realizes the composite measurement of A.C. contactor dynamic characteristic parameter.
3, the designed contact pressure transducer of the utility model can be realized the kinetic measurement of contact pressure, has filled up the blank of the dynamic contact contact parameter measurement of A.C. contactor aspect.
4, the designed contact pressure transducer dynamometry scope of the utility model is wide, is applicable to the contactor of all models.
5, the designed contact pressure transducer of the utility model has higher precision, and the pressure on can accurate recording contact changes.
6,, when this measurement device contact dynamic pressure changes, can also reflect the spring situation of contact.By the amplitude situation of change of contact pressure, can it is evident that the number of times of contact bounce, and the vibration processes of contact, comprise without dangerous vibration.
7, this device can be measured respectively or simultaneously two contacts at same tactile bridge two ends.Can be used for analyzing the situation of change of touching Liang Ge contact, bridge two ends upward pressure in contact system motion process, realize the dynamic process from new angle analysis double-breakpoint contact system.
8, this device can be realized all main contacts, auxiliary contact synchronously or measure respectively, the problem of closing a floodgate while can be used for analyzing three-phase main contact different.
9, the designed contact pressure transducer of the utility model can be further used for measuring the dynamic pressure situation of change between the dynamic and static iron core of A.C. contactor.
Brief description of the drawings:
Fig. 1 is the utility model embodiment contact pressure test device structured flowchart.
Fig. 2 is the utility model embodiment contact pressure sensor structure schematic diagram.
Fig. 3 is the utility model embodiment contact pressure transducer installation site schematic diagram.
Fig. 4 is composition and the annexation figure of the utility model embodiment closing phase angle controller.
Fig. 5 is the software flow pattern of the utility model embodiment test macro.
Fig. 6 is the ideal waveform figure with ADAMS software emulation.
Fig. 7 is the dynamic change oscillogram of closing phase angle contact pressure while being about 240 °.
Fig. 8 is the dynamic change oscillogram of closing phase angle contact pressure while being about 0 °.
Fig. 9 is the dynamic change oscillogram of closing phase angle contact pressure while being about 70 °.
Figure 10 is the dynamic change oscillogram of closing phase angle contact pressure while being about 270 °.
Embodiment:
Embodiment: (illustrating by reference to the accompanying drawings):
The composition of AC contactor touch head contact dynamic checkout unit described in the utility model as shown in Figure 1, is divided into host computer and slave computer; Host computer is industrial computer (6), and slave computer comprises: contact pressure transducer (2), charge amplifier (3), signal conditioning circuit (4), high-speed data acquisition card (5), closing phase angle controller (7); A.C. contactor (1) is test test product.
Connected mode is: it is upper that contact pressure transducer (2) is bonded in contactor test product (1), and the signal output part of contact pressure transducer (2) is connected with charge amplifier (3) by shielding line; The output terminal of charge amplifier (3) is connected to signal conditioning circuit (4) by shielding line; The output terminal of signal conditioning circuit (4) is connected with high-speed data acquisition card (5) by shielding line; The output terminal of high-speed data acquisition card (5) is connected with industrial computer (6); The output terminal of industrial computer (6) is connected to the signal input part of closing phase angle controller (7), and the signal output part of closing phase angle controller (7) is connected with A.C. contactor (1) test product; Industrial computer (6) is made up of display, main frame, keyboard, mouse, and it is connected with closing phase angle controller (7) with high-speed data acquisition card (5) respectively.
What charge amplifier (3) was selected is the DHF-10 type six passage high precision electric charge amplifiers of new technological industry company of Bei Dai River radio factory.The PCLD-8712 type signal condition module that signal conditioning circuit (4) adopts Yan Hua company to provide.The PCI-1712L type data collecting card that high-speed data acquisition card (5) Shi Yanhua company provides; The 610H type industrial computer that industrial computer (6) Shi Yanhua company provides.
As shown in Figure 2, contact pressure transducer described in the utility model (2) is by extension line (8), upper surface diaphragm (9), and PVDF piezoelectric membrane (10) and lower surface diaphragm (11) form; The core component of this contact pressure transducer is PVDF piezoelectric membrane (10), and it is the sensitive element of pressure sensor; The upper and lower surface of PVDF piezoelectric membrane (10) has diaphragm: upper surface diaphragm (9) and lower surface diaphragm (11), and both materials are all teflon, their effect is protection and insulation.One end of PVDF piezoelectric membrane (10) has extension line (8) to be used for drawing the electric charge that piezoelectric membrane produces.The title of PVDF piezoelectric membrane is Kynoar (PVDF) piezoelectric membrane, and technical standard: piezoelectric constant d33 is 21 ± 1PC/N; Thickness deviation is ± 5%; Thickness is 30 μ m.
Fig. 3 is the installation site schematic diagram of contact pressure transducer (2), as shown in the figure, one end of contact pressure transducer (2) is fixed on shock-absorbing support (15), it is upper that shock-absorbing support (15) is fixed on stationary contact bracket (14), and the material of this shock-absorbing support is the JD1 type rubber damper of the quiet Shock Absorber Co., Ltd in Shanghai; When test, with insulating gel (12), contact pressure transducer (2) is sticked on to the upper surface of the static contact (13) of tested A.C. contactor (1), extension line (8) is drawn from the space on stationary contact bracket (14) top, is incorporated into charge amplifier (3) by piezoelectric sensor private mask line.
Fig. 4 is the schematic diagram of phase selection controller (7): composition and the annexation of phase selection controller (7) are: phase selection phase angle controller (7) comprises voltage detecting circuit (16), single-chip microcomputer (17) and combined floodgate actuator (18) three parts; Wherein single-chip microcomputer (17) is connected with voltage detecting circuit (16), combined floodgate actuator (18) respectively, and single-chip microcomputer (17) is connected with industrial computer (6), and combined floodgate actuator (18) is connected with A.C. contactor (1); Host computer is that industrial computer (6) is as host computer control process of the test, require to send required closing phase angle value to single-chip microcomputer (17) according to user, single-chip microcomputer (17) is received after the closing phase angle of appointment, gather the excitation voltage signal of voltage detecting circuit (16), and calculate zero-crossing timing point and the accurate cycle of current excitation voltage, the closing phase angle computing relay time of then specifying according to industrial computer (6), delayed trigger combined floodgate actuator (18) is controlled A.C. contactor (1) and has been moved the phase selection function of A.C. contactor.
In phase selection controller (7), voltage detecting circuit (16) main devices is zero-crossing comparator, realizes voltage detecting function by it, and zero-crossing comparator is LM324 chip; Single-chip microcomputer (17) is selected the AT89S52 type single-chip microcomputer of Atmel company; Combined floodgate actuator (18) is selected powerful field effect transistor SSP17N80C.
Fig. 5 is program control flow chart, specifically describe as follows: test macro, before testing, first carry out initialization, whether normally detects each functional module, ensure that each sensor of measurement module is in standby condition, and detect supply voltage and whether reach test request.In the time that single-chip microcomputer (17) is received the combined floodgate order of industrial computer (6) transmission, single-chip microcomputer (17) starts to gather the excitation voltage zero cross signal of voltage detecting circuit (16), and then single-chip microcomputer (17) calculates the corresponding time delay of phase angle of appointment again; Then, send to combined floodgate actuator (18) order of closing a floodgate by I/O mouth time delay, and combined floodgate actuator (18) control A.C. contactor (1) action realizes the phase selection of A.C. contactor; When combined floodgate actuator (18) sends reclosing command, signal condition module (4), high-speed data acquisition card (5) are started working, and the data-signal input industrial computer (6) collecting is stored and shown.This device adopts LabVIEW to carry out software programming, can realize easily data acquisition, demonstration and memory function.
Carry out the dynamic test of a phase main contact contact taking the CJ20-25 A.C. contactor of commercially available acquisition as sample, when test, need to survey the contact pressure of which contact, just on the static contact of that contact, paste a contact pressure transducer.This A.C. contactor is double breaking points bridge contact, therefore need all paste this contact pressure transducer on two static contacts of one phase main contact.
When test, indoor temperature is 17 DEG C, and humidity is 21%, and charge amplifier setting value is sensitivity 21pc, gain 0.1k, continuous acquisition 20 groups of data, object be observe: the trend of contact pressure dynamic change; The situation of change of contact pressure peak and the spring situation of contact under different closing phase angles.
The method of testing of the utility model AC contactor touch head contact dynamic checkout unit, comprises the steps:
1, as shown in Figure 3, with insulating gel (12), contact pressure transducer (2) is sticked on to the upper surface of the static contact (13) of tested A.C. contactor, extension line (8) is drawn from the space, top of stationary contact bracket (14), is incorporated into charge amplifier (3) by piezoelectric sensor private mask line.
2, general supply powers on, and whether industrial computer (6) program checkout modules supply voltage is normal, if normal, program is carried out initialization setting to all devices.
3, at the upper experiment parameter of setting of industrial computer (6), as closing phase angle etc.
4, industrial computer (6) is communicated by letter with slave computer phase selection phase angle controller (7), and will close/separating brake phase angle is issued phase selection phase selection phase angle controller (7), and sends the steering order of close/separating brake to phase selection phase angle controller (7).
5, phase selection phase angle controller (7) is received after the order of close/separating brake, carries out close/separating brake program, controls A.C. contactor adhesive or disjunction.After close/separating brake command execution, detect the whether normal adhesive of A.C. contactor test product (1) or disjunction, if break down, slave computer sends fault prompting to industrial computer (6).
6, when phase selection phase angle controller (7) is carried out combined floodgate program, just have contact signal and occur on contact pressure transducer (2), this signal is input signal conditioning circuit (4) after charge amplifier (3) amplifies processing.
7, enter high-speed data acquisition card (5) through signal conditioning circuit (4) data after treatment.
8, industrial computer (6) is controlled and is received the data-signal that high-speed data acquisition card (5) gathers.
9, industrial computer (6) is processed signal and demonstration, store test results.
Fig. 6 is that wherein A is the pulse waveform of once bouncing with the ideal waveform figure of a contact pressure of ADAMS software emulation, and B is the pulse waveform of secondary bounce, and C represents end pressure pulse waveform; Fig. 7 is the dynamic change oscillogram of closing phase angle contact pressure while being about 240 °, and wherein waveform F1 and waveform F2 are respectively that the pressure of upper and lower two contacts of same tactile bridge changes waveform.The simulation waveform of Fig. 6 can be found out with the pulse waveform F2 contrast in Fig. 7, and in Fig. 7, waveform F2 can reflect that contact once bounces and the dynamic changing process of secondary bounce, and the each flutter between twice spring also can show through amplifying.Certainly we also can obtain that contact once bounces and the contact peak value size of secondary bounce.Visible the method can obtain the Dynamic Signal overall process of contact pressure clearly.
In addition, contrast waveform F1 and waveform F2 can find out in Fig. 7, on same tactile bridge, to change be inconsistent to the amplitude of the contact of two contacts.The amplitude of waveform F1 changes more stably than waveform F2, and it is obvious that spring and vibration are all not so good as waveform F2.Contrast first rise time of waveform F1 and waveform F2 from time shaft, can find out very clearly the asynchronisms of two contact actions on same tactile bridge.Cause the reason of above inconsistent and asynchronism, the one, the restriction of supporting construction of touching bridge due to AC contactor touch head, moreover be that work and test time must be installed A.C. contactor level, in the time of contact closure, because the friction of contact probe bridge bracket bottom and A.C. contactor housing is larger, can make the closure time of two contacts and contact pressure size have certain difference.
For bandwagon effect, we enclose Fig. 8,9,10, are respectively the contact oscillogram of closing phase angle while being about 0 °, 70 °, 270 °.Waveform F3 in Fig. 8 and F4 are respectively that the contact of two contacts on same tactile bridge changes waveform, and waveform U represents electric current, waveform V representative voltage.Contrasting these three figure can find out, when closing phase angle is different, the amplitude of contact pressure alters a great deal; By the amplitude situation of change of contact pressure, can it is evident that the number of times of contact bounce, and the vibration processes of contact, comprise without dangerous vibration and (while being contact closure, have vibration, but dynamic and static contact does not separate, low voltage electrical apparatus industry is referred to as contact vibration now without dangerous vibration) also can reflect.This judges that for us best closing phase angle is very valuable.
The method can be tested the contact of arbitrary contact individually or simultaneously, releases and this contact pressure transducer can be positioned between dynamic and static iron core, to measure dynamic touch pressure signal between the dynamic and static iron core of A.C. contactor.This test macro can be stored the data of contact signal between contact pressure and dynamic and static iron core at any time, for later analysis processing.
The utility model is not addressed part and is applicable to prior art.
Claims (1)
1. an AC contactor touch head contact dynamic checkout unit, is characterized by this device and comprises host computer and slave computer; Host computer is industrial computer, and slave computer comprises: contact pressure transducer, charge amplifier, signal conditioning circuit, high-speed data acquisition card, closing phase angle controller; A.C. contactor is test test product;
Connected mode is: contact pressure transducer is bonded on contactor test product, and the signal output part of contact pressure transducer is connected with charge amplifier by shielding line; The output terminal of charge amplifier is connected to signal conditioning circuit by shielding line; The output terminal of signal conditioning circuit is connected with high-speed data acquisition card by shielding line; The output terminal of high-speed data acquisition card is connected with industrial computer; The output terminal of industrial computer is connected to the signal input part of closing phase angle controller, and the signal output part of closing phase angle controller is connected with A.C. contactor test product;
Described contact pressure transducer is made up of extension line, upper surface diaphragm, PVDF piezoelectric membrane and lower surface diaphragm; The upper and lower surface of PVDF piezoelectric membrane is respectively upper surface diaphragm and lower surface diaphragm, and both materials are all teflon; One end of PVDF piezoelectric membrane has extension line to be used for drawing the electric charge that piezoelectric membrane produces;
Described closing phase angle controller composition comprises voltage detecting circuit, single-chip microcomputer and combined floodgate actuator three parts; Wherein single-chip microcomputer is connected with voltage detecting circuit, combined floodgate actuator respectively, and single-chip microcomputer is connected with industrial computer, and combined floodgate actuator is connected with A.C. contactor;
In described switching-on controller, voltage detecting circuit chief component is zero-crossing comparator, and zero-crossing comparator is LM324 chip; Single-chip microcomputer is the AT89S52 type single-chip microcomputer of Atmel company; Combined floodgate actuator is powerful field effect transistor SSP17N80C;
High-speed data acquisition card is PCI-1712L type data collecting card.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320783745.0U CN203745117U (en) | 2013-11-30 | 2013-11-30 | Device for dynamic testing of contact pressure of contact terminal of alternating-current contactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320783745.0U CN203745117U (en) | 2013-11-30 | 2013-11-30 | Device for dynamic testing of contact pressure of contact terminal of alternating-current contactor |
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| CN203745117U true CN203745117U (en) | 2014-07-30 |
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| CN201320783745.0U Withdrawn - After Issue CN203745117U (en) | 2013-11-30 | 2013-11-30 | Device for dynamic testing of contact pressure of contact terminal of alternating-current contactor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604544A (en) * | 2013-11-30 | 2014-02-26 | 河北工业大学 | Device and method for dynamic testing of contact pressure of contact terminal of alternating-current contactor |
| CN105987780A (en) * | 2015-02-02 | 2016-10-05 | 国家电网公司 | High-precision measurement ammeter stand spring pressure circuit |
| CN113466110A (en) * | 2021-07-19 | 2021-10-01 | 中山大学 | Cell electrophysiological signal discrete in-situ long-time measurement and recording system and method |
| 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 |
-
2013
- 2013-11-30 CN CN201320783745.0U patent/CN203745117U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604544A (en) * | 2013-11-30 | 2014-02-26 | 河北工业大学 | Device and method for dynamic testing of contact pressure of contact terminal of alternating-current contactor |
| CN105987780A (en) * | 2015-02-02 | 2016-10-05 | 国家电网公司 | High-precision measurement ammeter stand spring pressure circuit |
| CN113466110A (en) * | 2021-07-19 | 2021-10-01 | 中山大学 | Cell electrophysiological signal discrete in-situ long-time measurement and recording system and method |
| 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 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140730 Effective date of abandoning: 20151007 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |