CN1632608A - Reliability test installation for overload relay - Google Patents
Reliability test installation for overload relay Download PDFInfo
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- CN1632608A CN1632608A CN 200410094147 CN200410094147A CN1632608A CN 1632608 A CN1632608 A CN 1632608A CN 200410094147 CN200410094147 CN 200410094147 CN 200410094147 A CN200410094147 A CN 200410094147A CN 1632608 A CN1632608 A CN 1632608A
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Abstract
This invention relates to an overloading relay reliability test device, which comprises hardware and software, wherein, the software is composed of operation parameter display, modification module, file process module and test operation control module; and the hardware comprises the computer with display, host machine and keyboard, contact test circuit, test sample control circuit, and test current generation circuit. The computer is separately connected with contact test circuit, test sample control circuit and test current generation circuit through bus interface.
Description
Technical field
The invention belongs to a kind of reliability test in the low-voltage electrical apparatus field, particularly can finish the device of overload relay fail-test.
Background technology
The low-voltage electrical apparatus fail-test is a kind of important means that ensures and improve the low-pressure electronic equipment product quality, and reliability test is an essential condition of finishing fail-test.In the fail-test of overload relay, need strong current generator, also need to write down test figure.In the former test, these work all are manual records, can't finish automatically, and test figure are difficult for long preservation, lose easily, and human factor is big, and test figure is inaccurate.
Along with electronic technology and computer application, the electronization of test unit, digitizing and computerized development are very fast.Though in the performance test of thermal overload relay, people begin to adopt the performance test apparatus of PLC control technology development thermal overload relay, yet in the overload relay fail-test, also do not adopt the test unit of the direct control technology of computing machine.
In traditional overload relay test, adopt great current mutual inductor that test current is provided, and the adjusting of test current adopt staff to go to regulate usually, therefore when voltage ripple of power network, test current is fluctuation thereupon also, and staff can't accurately be reconciled, and causes test figure inaccurate.
" contact mechanism of electronic overload relay " (number of patent application 99808448.4) patent relates generally to a kind of mechanism of improving the overload relay reliability; " thermal overload relay that is used for the motor underphase-preventing protection " (number of patent application 01280693.5) patent relates generally to a kind of structure that improves the overload relay phase failure protection; " thermal overload relay " (number of patent application 02284613.1) patent relates generally to a kind of thermal overload relay, and this thermal overload relay can stop the position change of leaf spring of governor motion and the left and right motion of release lever, to improve the relay reliability of operation.Above patent all belongs to the device to the overload relay improvement in performance, improves the overload relay reliability with this, but does not relate to the device of overload relay fail-test.
In order to ensure and to improve the low-pressure electronic equipment product quality, guarantee the reliability of overload relay, so press for a kind of reliability test installation for overload relay that adopts the direct control technology of computing machine.
Summary of the invention
Technical matters to be solved
Task of the present invention is to provide a kind of device that can finish the overload relay fail-test, this device can be realized automatic adjusting, the automatic steady current of test current, can also finish whole overload relay fail-test automatically, realize the automatic record of test figure and the automatic record of fault data, and can realize shielding automatically the fault test product, and not influencing the test of other test product, this test unit can also carry out the output and the printing of test figure.The test unit that can control automatically and write down is provided.
Realize technical scheme of the present invention
For finishing above-mentioned task, the solution that the present invention takes is: a kind of thermal overload relay reliability test is made up of hardware and software, and software section is made up of operational factor demonstration and modified module, document processing module, test run control module; Hardware components is produced circuit 7 and is formed by display 1, main frame 2, keyboard 3, contacts status detection loop 5, test product test control circuit 6, test current.Constitute the computing machine of standard by display 1, main frame 2, keyboard 3, computing machine produces circuit 7 and links to each other with contact state testing circuit 5, test product test control circuit 6, test current by bus interface 4, and contacts status testing circuit 5, test product test control circuit 6, test current produce circuit 7 and link to each other with test product.
Contacts status detects loop 5 and comprises first photoisolator, second photoisolator, digital to analog converter, voltage amplifier, voltage comparator, its connected mode is: computing machine links to each other successively with second photoisolator, digital to analog converter, voltage amplifier, voltage comparator and first photoisolator, and the test product contact links to each other with voltage comparator simultaneously.
Test product test control circuit 6 comprises solid-state relay, contactor J1-contactor J6, its connected mode is: computing machine links to each other with solid-state relay, the coil of contactor J1-contactor J6 links to each other successively, contact J1-1 and test product 1 among the contactor J1 are connected in series, again with contactor J4 in contact J4-1 be connected in parallel, contact J2-1 and test product 2 among the contactor J2 are connected in series, again with contactor J5 in contact J5-1 be connected in parallel, contact J3-1 and test product 3 among the contactor J3 are connected in series, contact J6-1 with contactor J6 is connected in parallel again, after contact J1-1 among the contactor J1 and the contact J4-1 among the contactor J4 are connected in parallel, link to each other with the strong current transformer that test current produces in the circuit 7 again, after the contact J6-1 of test product 3 and contactor J6 is connected in parallel, link to each other with the strong current transformer that test current produces in the circuit 7 again.
Test current produces circuit 7 and comprises electric voltage regulator, strong current transformer, current transformer, A/D converter, its connected mode is: electric voltage regulator be input as supply voltage, and " fall " control line with computing machine " liter " and be connected, the output of electric voltage regulator is connected with the primary side of strong current transformer, the secondary side output of strong current transformer and overload relay test product, the current transformer of low resistance are connected in series, current transformer is connected with A/D converter, and A/D converter is connected with computing machine.
The overload relay reliability test method is: the rated current that at first passes to 1.05 times, monitor the contact of test product then, the contacts status of overload relay does not change in the time of setting, test product is normal, in the time that the contacts status of overload relay is being set, change, test product is a fault, can shield the fault test product by contactor J1, J2, J3, J4, J5, J6; And then, to the rated current of logical 1.2 times of test product, the contacts status of overload relay changed in the time of setting, and test product is normal, otherwise overload relay is a fault, by contactor J1, J2, J3, J4, J5, J6 the fault test product is shielded; Test product is returned to cold conditions, then at logical specified test current to stable state, rated current to logical 1.5 times of test product, the contacts status of overload relay changed in the time of setting, test product is normal, otherwise overload relay is a fault, by contactor J1, J2, J3, J4, J5, J6 the fault test product is shielded; Test product is returned to cold conditions, to the rated current of logical 7.2 times of test product, the contacts status of overload relay changed in the time of setting, and test product is normal, otherwise overload relay is a fault, by contactor J1, J2, J3, J4, J5, J6 the fault test product is shielded; By above process of the test, constitute a test circulation, overload relay to be tested repeatedly, record test cycle index and test fault are carried out the fail-safe analysis and the calculating of overload relay by the fail-test theory after the off-test.
Reliability test installation for overload relay is tested under computer control, and its working procedure is:
(1) operating overload relay reliability test routine after computing machine powers on;
(2) judged whether the key input, no key repeated for the 2nd step when importing, and had the key input to change for the 3rd step;
(3) judge whether to be the parameter modification key, changeed for the 4th step when not being the parameter modification key, when being the parameter modification key, carry out following processing:
Show operational factor and revise operational factor.The test run parameter is the basic setting content of test, and the user shows by parameter can understand the condition that the test product test is carried out, and the test run parameter is that fault is judged main foundation.Different test products have different testing requirementss, and the user also can carry out parameter modification easily by keyboard, satisfies testing requirements.Computing machine is preserved amended operational factor automatically, moves the parameter that computer-chronograph is called in operation last time automatically in next time.Main operational factor comprises: the actuation time under being failure to actuate the time under 1.05 times of electric currents, 1.2 times of electric currents, the actuation time under 1.5 times of electric currents, 7.2 scope actuation time under the electric current doubly, short-time test electric current and actuation time, test product model, allow the number of stoppages, parameters such as test number (TN).
After showing operational factor and revising operational factor, changeed for the 2nd step.
(4) judge whether to be the file processing key, changeed for the 5th step when not being the file processing key, when being the file processing key, carry out following processing:
File processing comprised data file storage, call in, the demonstration printing of test figure etc.After a collection of test product test is finished, test figure is saved in the computing machine by document processing module; Also can pass through read data files, former test figure is read in, so that the user understands the test situation of test product in the past; Also can test figure be presented on the graphoscope or by printer carry out output print by showing or print command.
After file processing is finished, changeed for the 2nd step.
(5) judge whether to be the test run key, changeed for the 6th step when not being the test run key, when being the test run key, carry out following processing:
Test run is the core of fail-test, the process of the test of test unit and the record of test figure in this module controls entire test.This module can be finished the stability test electric current, monitors actuation time, monitor reset time.The test that this module is finished comprises: the fail-test of thermal overload protection relay under the fail-test of thermal overload protection relay under the fail-test of thermal overload protection relay under 1.2 times of rated current, the 1.5 times of rated current, the 7.2 times of rated current.
After test run is finished, changeed for the 2nd step.
(6) judge whether to be ESC Escape, changeed for the 2nd step when being not ESC Escape, when being ESC Escape, withdraw from the overload relay fail-test.
The present invention's beneficial effect and advantage compared with prior art:
(1) reliability test installation for overload relay of the present invention can be finished the overload relay reliability compliance test automatically, does not need in test manual intervention, has shortened the whole test time.
(2) reliability test installation for overload relay of the present invention can be provided with and revise test parameters, and these test parameterss comprise the test period under 1.05 times, 1.2 times, 1.5 times, 7.2 times rated current, quick equivalent test electric current and the corresponding test current thereof.
(3) test current among the present invention is by computer-controlled, when the test product resistance in circuit changes and during mains fluctuations, it is constant that test current keeps;
(4) reliability test installation for overload relay of the present invention carries out automatic record to the overload test time, when the overload relay output state change, computing machine writes down test period automatically, the human factors such as misregister of having avoided the manual record test period to bring, be convenient to the fault analysis of people after test, reach the purpose that improves the overload relay reliability;
(5) complete data protection function, data are not lost behind the accident power-off, do not destroy the data of having gathered behind the power up, the permanent computing machine that is kept at of test figure, and can easily transfer in the external memory device, can also on other computing machine, check easily and the printout test figure;
(6) can carry out separate unit test product test, also can test all test products, in process of the test, computing machine carries out operation indicating, can reduce maloperation, and termination test at any time.Easy and simple to handle, man-machine interface good.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a contacts status testing circuit structural representation of the present invention;
Fig. 3 is a test product test control circuit structural representation of the present invention;
Fig. 4 is that test current of the present invention produces electrical block diagram;
Fig. 5 is a test run computer programme flow diagram of the present invention;
Fig. 6 is an embodiment of the invention circuit diagram.
The specific embodiment of the invention (specifying in conjunction with the accompanying drawings)
Embodiment:
As shown in Figure 1, this reliability test installation for overload relay, comprised that display 1, main frame 2, keyboard 3, contacts status testing circuit 5, test product test control circuit 6, test current produce circuit 7, display 1, main frame 2, keyboard 3 have constituted the computing machine of standard, and the connection of this device is: computing machine produces circuit 7 and is connected with contact state testing circuit 5, test product test control circuit 6, test current by bus interface 4.
Be illustrated in figure 3 as contacts status detection of the present invention loop 5 and comprise first photoisolator, second photoisolator, digital to analog converter, voltage amplifier, voltage comparator, its connected mode is: computing machine links to each other successively with second photoisolator, digital to analog converter, voltage amplifier, voltage comparator and first photoisolator, and the test product contact links to each other with voltage comparator simultaneously.Computing machine is sent into second photoisolator with the test current data of setting by bus interface, send into digital to analog converter by second photoisolator, is aanalogvoltage by digital to analog converter with the digital signal conversion of test current, be converted to the threshold voltage signal through voltage amplifier, the threshold voltage signal is connected voltage comparator with contact both end voltage signal, when contact is closure, its voltage ratio threshold voltage signal is low, voltage comparator is output as the digital signal of high level, when contact is disconnection, its voltage ratio threshold voltage signal height, voltage comparator is output as low level digital signal, the digital signal of voltage comparator output inputs to computing machine through the isolation of the first photoisolator light, on behalf of the digital signal of test product contact state, computing machine will read in, realization judges to the monitoring of overload relay contact state whether overload relay moves.
Be illustrated in figure 4 as test product test control circuit 6 of the present invention, test product test control circuit 6 comprises solid-state relay, contactor J1-contactor J6, its connected mode is: computing machine links to each other with solid-state relay, the coil of contactor J1-contactor J6 links to each other successively, contact J1-1 and test product 1 among the contactor J1 are connected in series, again with contactor J4 in contact J4-1 be connected in parallel, contact J2-1 and test product 2 among the contactor J2 are connected in series, again with contactor J5 in contact J5-1 be connected in parallel, contact J3-1 and test product 3 among the contactor J3 are connected in series, contact J6-1 with contactor J6 is connected in parallel again, after contact J1-1 among the contactor J1 and the contact J4-1 among the contactor J4 are connected in parallel, link to each other with the strong current transformer that test current produces in the circuit 7 again, after the contact J6-1 of test product 3 and contactor J6 is connected in parallel, link to each other with the strong current transformer that test current produces in the circuit 7 again.J1, J2, J3, J4, J5, J6 are 6 contactors among the figure, computing machine is by the input/output port control solid-state relay of bus interface, solid-state relay drives contactor, realize the control of computing machine thus to contactor J1, J2, J3, J4, J5, J6, when contactor J1 closure, when contactor J4 disconnects test product 1 is tested, when contactor J4 closure, shielding test product 1 when contactor J1 disconnects, it is not tested, the test product 2 of contactor J2, contactor J5 control in like manner, contactor J3, contactor J6 control test product 3.
Be illustrated in figure 5 as test current of the present invention and produce circuit 7, test current produces circuit and comprises electric voltage regulator, strong current transformer, current transformer, AD converter, its connected mode is: electric voltage regulator be input as supply voltage, and " fall " control line with computing machine " liter " and be connected, the output of electric voltage regulator links to each other with the input of the primary side of strong current transformer, the secondary side output of strong current transformer and overload relay, the current transformer of low resistance are connected in series, current transformer is connected with A/D converter, and A/D converter is connected with computing machine.Current transformer detects the electric current that flows through test product, convert current signal to digital signal in computing machine by A/D converter, computing machine compares the current value of detected current value and setting, the current value of setting when detected current value ratio hour, the computer control electric voltage regulator rises voltage, when the current value of setting when detected current value ratio is big, the computer control electric voltage regulator descends voltage, equate with the current value of setting up to detected current value, when mains fluctuations or the variation of test product loop resistance, make test current and setting value not simultaneously, computing machine also automatically regulation voltage galvanoscope is equated with setting value, realize the current stabilization of test current.
Reliability test installation for overload relay of the present invention is finished the overload relay fail-test under computer control, flow chart as shown in Figure 5, its test run program is:
(1) operating overload relay reliability test routine after computing machine powers on;
(2) judged whether the key input, no key repeated for the 2nd step when importing, and had the key input to change for the 3rd step;
(3) judge whether to be the parameter modification key, changeed for the 4th step when not being the parameter modification key, when being the parameter modification key, carry out following processing:
Show operational factor and revise operational factor.The test run parameter is the basic setting content of test, and the user shows by parameter can understand the condition that the test product test is carried out, and the test run parameter is that fault is judged main foundation.Different test products have different testing requirementss, and the user can carry out parameter modification easily by keyboard.Amended operational factor computing machine is preserved automatically, moves the parameter that computer-chronograph is called in operation last time automatically in next time.Main operational factor comprises: the actuation time under being failure to actuate the time under 1.05 times of electric currents, 1.2 times of electric currents, the actuation time under 1.5 times of electric currents, 7.2 scope actuation time under the electric current doubly, short-time test electric current and actuation time, test product model, allow the number of stoppages, parameters such as test number (TN).
After showing operational factor and revising operational factor, changeed for the 2nd step.
(4) judge whether to be the file processing key, changeed for the 5th step when not being the file processing key, when being the file processing key, carry out following processing:
File processing comprised data file storage, call in, the demonstration printing of test figure etc.After a collection of test product test is finished, test figure is saved in the computing machine by document processing module; By read data files, former test figure can be read in, so that the user understands the test situation of test product in the past; By showing or print command, test figure can be presented on the graphoscope or by printer and carry out output print.
After file processing is finished, changeed for the 2nd step.
(5) judge whether to be the test run key, changeed for the 6th step when not being the test run key, when being the test run key, carry out following processing:
Test run is the core of fail-test, and whole reliability is carried out by this module controls, is responsible for the process of the test of the test unit in the control entire test and the record of test figure.This module can be finished the stability test electric current, monitors actuation time, monitor reset time.
The test that this module is finished comprises: the fail-test of thermal overload protection relay under the fail-test of thermal overload protection relay under the fail-test of thermal overload protection relay under 1.2 times of rated current, the 1.5 times of rated current, the 7.2 times of rated current.
Overload relay fail-test implementation method is: the rated current that at first passes to 1.05 times, monitor the contact of test product then, the contacts status of overload relay does not change in the time of setting, test product is normal, in the time that the contacts status of overload relay is being set, change, test product is a fault, can shield the fault test product by contactor J1, J2, J3, J4, J5, J6; And then, to the rated current of logical 1.2 times of test product, the contacts status of overload relay changed in the time of setting, and test product is normal, otherwise overload relay is a fault, can shield the fault test product by contactor J1, J2, J3, J4, J5, J6; Test product is returned to cold conditions, then at logical specified test current to stable state, rated current to logical 1.5 times of test product, the contacts status of overload relay changed in the time of setting, test product is normal, otherwise overload relay is a fault, can shield the fault test product by contactor J1, J2, J3, J4, J5, J6; Test product is returned to cold conditions, to the rated current of logical 7.2 times of test product, the contacts status of overload relay changed in the time of setting, and test product is normal, otherwise overload relay is a fault, by contactor J1, J2, J3, J4, J5, J6 the fault test product is shielded; By above process of the test, constitute a test circulation, overload relay is tested repeatedly record test cycle index and test fault.
After test run is finished, changeed for the 2nd step.
(6) judge whether to be ESC Escape, changeed for the 2nd step when being not ESC Escape, when being ESC Escape, withdraw from the overload relay fail-test.
Provided the physical circuit of overload relay fail-test of the present invention as shown in Figure 6.
Among Fig. 6 the contact thresholding setting value of computing machine output as calculated the bus interface 4 of machine export to No. 8 photoisolators of forming by resistance R 1-R8 and photoelectrical coupler T1-T8 in the contact state testing circuit 5, photoelectrical coupler T1-T8 connecting resistance R9-R16, and input to the digital input end of D/A converter, D/A converter is converted to aanalogvoltage with the digital signal of input, this voltage is via resistance R 17, R18, the amplifying circuit that amplifier U1 constitutes amplifies, give comparer U2 as threshold voltage, U3, the in-phase input end of U4, comparer U2, U3, the inverting input of U4 fetches respectively from test product 1, test product 2, the contact of test product 3, when the test product contact is disconnection, comparer is output as low level, when the test product contact is closure, comparer is output as high level, comparer U2, U3, the output of U4 is respectively through resistance R 19, R20, R21, photoelectrical coupler T9, T10, T11, resistance R 22, R23, R24 inputs to computing machine, realizes the detection to the test product contact state.
Computing machine is realized by test product test control circuit 6 control of test product test among Fig. 6, the output connecting resistance R28-R33 of computing machine, resistance R 28-R33 and six A.C. contactor J1-A.C. contactor J6 of solid-state relay SSR1-SSR6 control, the contact J1-1 of A.C. contactor, J2-1, J3-1, J4-1, J5-1, J6-1 controls test product 1 respectively, test product 2, test product 3, when the contact of contactor J1 J1-1 closure, when the contact J2-1 of contactor J2 disconnects test product 1 is tested, when the contact of contactor J1 J1-1 disconnects, when the contact J2-1 of contactor J2 is closed test product 1 is shielded, realize the test control of computing machine to test product 1, equally, computing machine is by contactor J3, contactor J4 realizes the test control to test product 2, and computing machine is by contactor J5, contactor J6 realizes the test control to test product 3.
Test current at Fig. 6 produces in the circuit 7, resistance R 34, R35, R37, R38, photoelectrical coupler T12, T13, T14, T15 forms the control circuit of the rotating of motor M 1, its control end is two delivery outlet controls of computing machine, when two mouths are all high level or low level, motor M 1 is not changeed, when first mouthful is high level, when another mouthful was low level, motor M 1 was just being changeed, and drove pressure regulator BY1 and boosted, electric current increases in the test product loop, when first mouthful is low level, when another mouthful is high level, motor M 1 counter-rotating, drive pressure regulator BY1 step-down, electric current reduces in the test product loop.Pressure regulator BY1 output meets big electric current device BL1, the output of big electric current device BL1 meets current transformer LH1, and with test product test control circuit 5 in probe of contactor and test product form current return, the secondary side connecting resistance R39 of current transformer LH1 is converted to voltage, this voltage amplifies via the amplifying circuit that resistance R 40, R41, operational amplifier U5 form, and inputing to A/D converter, A/D converter inputs to computing machine after aanalogvoltage is converted to digital signal.Computing machine produces adjusting, control and the detection that circuit 7 is realized test current by test current.
Claims (4)
1, a kind of reliability test installation for overload relay, it is characterized in that: it comprises by display (1), main frame (2), the computing machine that keyboard (3) constitutes, contacts status testing circuit (5), test product test control circuit (6), test current produces circuit (7), its connected mode is: computing machine by bus interface (4) respectively with contact state testing circuit (5), test product test control circuit (6), test current produces circuit (7) and links to each other contacts status testing circuit (5), test product test control circuit (6), test current produces circuit (7) and links to each other with test product respectively.
2, reliability test installation for overload relay according to claim 1, it is characterized in that: contacts status detects loop (5) and comprises first photoisolator, second photoisolator, digital to analog converter, voltage amplifier, voltage comparator, its connected mode is: computing machine links to each other successively with second photoisolator, digital to analog converter, voltage amplifier, voltage comparator and first photoisolator, and the test product contact links to each other with voltage comparator simultaneously.
3, reliability test installation for overload relay according to claim 1, it is characterized in that: test product test control circuit (6) comprises solid-state relay, contactor J1-contactor J6, its connected mode is: computing machine and solid-state relay, the coil of contactor J1-contactor J6 links to each other successively, contact J1-1 and test product 1 among the contactor J1 are connected in series, again with contactor J4 in contact J4-1 be connected in parallel, contact J2-1 and test product 2 among the contactor J2 are connected in series, again with contactor J5 in contact J5-1 be connected in parallel, contact J3-1 and test product 3 among the contactor J3 are connected in series, contact J6-1 with contactor J6 is connected in parallel again, after contact J1-1 among the contactor J1 and the contact J4-1 among the contactor J4 are connected in parallel, link to each other with the strong current transformer that test current produces in the circuit (7) again, after the contact J6-1 of test product 3 and contactor J6 is connected in parallel, link to each other with the strong current transformer that test current produces in the circuit (7) again.
4, reliability test installation for overload relay according to claim 1, it is characterized in that: test current produces circuit (7) and comprises electric voltage regulator, strong current transformer, current transformer, A/D converter, its connected mode is: electric voltage regulator be input as supply voltage, and " fall " control line with computing machine " liter " and be connected, the output of electric voltage regulator is connected with the primary side of strong current transformer, the secondary side output of strong current transformer and the overload relay test product of low resistance, current transformer is connected in series, current transformer is connected with A/D converter, and A/D converter is connected with computing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100941478A CN100354641C (en) | 2004-12-31 | 2004-12-31 | Reliability test installation for overload relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100941478A CN100354641C (en) | 2004-12-31 | 2004-12-31 | Reliability test installation for overload relay |
Publications (2)
| Publication Number | Publication Date |
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| CN1632608A true CN1632608A (en) | 2005-06-29 |
| CN100354641C CN100354641C (en) | 2007-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100941478A Expired - Fee Related CN100354641C (en) | 2004-12-31 | 2004-12-31 | Reliability test installation for overload relay |
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| CN (1) | CN100354641C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293471A (en) * | 2013-04-25 | 2013-09-11 | 上海电器科学研究所（集团）有限公司 | Device and method capable of intelligently detecting electric leakage switch in communicating mode |
| CN105510823A (en) * | 2016-01-25 | 2016-04-20 | 南安普敦咨询服务有限公司 | Thermal relay running monitoring system |
| CN108828442A (en) * | 2018-06-22 | 2018-11-16 | 中广核核电运营有限公司 | Time-delay relay detection device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58190778A (en) * | 1982-04-30 | 1983-11-07 | Matsushita Electric Works Ltd | Relay inspector |
| DE4211251C1 (en) * | 1992-04-03 | 1993-07-15 | Siemens Ag, 8000 Muenchen, De | |
| CN1243957A (en) * | 1998-07-30 | 2000-02-09 | 曹骥 | High-low temperature life experimental device for comprehensive electromagnetic relay |
| CN2620283Y (en) * | 2003-06-03 | 2004-06-09 | 南京大学 | Automatic fast measurer for relay |
| CN2768015Y (en) * | 2004-12-31 | 2006-03-29 | 河北工业大学 | Device for testing overload relay reliability |
-
2004
- 2004-12-31 CN CNB2004100941478A patent/CN100354641C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293471A (en) * | 2013-04-25 | 2013-09-11 | 上海电器科学研究所（集团）有限公司 | Device and method capable of intelligently detecting electric leakage switch in communicating mode |
| CN105510823A (en) * | 2016-01-25 | 2016-04-20 | 南安普敦咨询服务有限公司 | Thermal relay running monitoring system |
| CN108828442A (en) * | 2018-06-22 | 2018-11-16 | 中广核核电运营有限公司 | Time-delay relay detection device |
| CN108828442B (en) * | 2018-06-22 | 2021-08-03 | 中广核核电运营有限公司 | Time-delay relay detection device |
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| Publication number | Publication date |
|---|---|
| CN100354641C (en) | 2007-12-12 |
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