CN101464496A - Overload reliability test assembly for plastic case breakers and implementing method thereof - Google Patents

Overload reliability test assembly for plastic case breakers and implementing method thereof Download PDF

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Publication number
CN101464496A
CN101464496A CNA2009100676831A CN200910067683A CN101464496A CN 101464496 A CN101464496 A CN 101464496A CN A2009100676831 A CNA2009100676831 A CN A2009100676831A CN 200910067683 A CN200910067683 A CN 200910067683A CN 101464496 A CN101464496 A CN 101464496A
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test
circuit
current
test specimen
contactor
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CN101464496B (en
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陆俭国
李奎
王晓旭
姚冬梅
岳大为
王尧
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Hebei University of Technology
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Hebei University of Technology
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Abstract

The invention relates to a reliability testing device in the field of low voltage devices, in particular to an overload reliability testing device for a molded case circuit breaker and an implementation method thereof. The testing device comprises a computer control cabinet and a testing cabinet. The computer control cabinet comprises an industrial control computer, a test voltage and current detecting circuit, a control circuit and a test sample state detecting circuit; the testing cabinet comprises a heavy current adjusting circuit, a current threshold regulating circuit and a balanced loop switching circuit; the industrial control computer is respectively connected with the test voltage and current detecting circuit, the control circuit and the test sample detecting circuit; the test voltage and current detecting circuit is respectively connected with the current threshold regulating circuit and the heavy current adjusting circuit; and the control circuit is respectively connected with the current threshold regulating circuit, the heavy current adjusting circuit and the balanced loop switching circuit. The testing device can complete the overload reliability test of the whole molded case circuit breaker, automatically record test data and failure data, and automatically shield defective test samples, and can not influence the test of other test samples; and the testing device also can output and print the test data. The testing device is controlled by the computer, has the advantages of simple operation and high automaticity, can be widely used in the overload reliability test of the whole molded case circuit breaker, and has the advantages of important social benefit and application value.

Description

Overload reliability test assembly for plastic case breakers and implementation method
Technical field
The present invention relates to reliability test in the low-voltage electrical apparatus field, particularly a kind of overload reliability test assembly for plastic case breakers and implementation method.This device can be realized automatic adjusting, the automatic steady current of test current, can also finish whole breaker of plastic casing overload fail-test automatically, realize the automatic record of test figure and the automatic record of fault data, and can realize shielding the Test to Failure sample automatically, and do not influence the test of other test specimen.
Background technology
Moulded case circuit breaker (hereinafter to be referred as breaker of plastic casing) is the visual plant in the low-voltage electrical apparatus, is used for the safety of low-voltage distribution loop, motor or other consumer protection electric wiring and equipment.When electric wiring or during fault such as consumer transships, short circuit, its electrical apparatus release can in time move, reliably with circuitry cuts; When electric wiring or consumer were in normal condition, its main contact can reliably be connected circuit, and its electrical apparatus release is not answered misoperation.
Along with national economy is growing to the quantity of breaker of plastic casing demand; performance, quality requirements to breaker of plastic casing is more and more higher simultaneously; require dispatching from the factory of breaker of plastic casing to debug and test through more perfect dispatching from the factory; if its reliability is not high; especially the overload protection performance does not meet the needs of producing and living; can bring very big influence to the user, even cause serious economy loss.
The overload characteristics of breaker of plastic casing is meant that the low-voltage circuit breaker tripping characteristic should meet following provisions: when test current equaled 1.05 times of rated current, electrical apparatus release was failure to actuate the official hour planted agent; When test current equaled 1.3 times of rated current, electrical apparatus release moved the official hour planted agent.When test current equaled 3.0 times of rated current, electrical apparatus release was failure to actuate the very short time planted agent of regulation, and when and then logical test current equaled 0.9 times of rated current, electrical apparatus release was failure to actuate the official hour planted agent.
At present, aspect the related correlation technique of this test unit, domestic and international research mainly contains following several respects: the 1) end of the eighties, the appliance contact wear test station of U.S. Engelhowd company, requirement according to IEC158-1 is tested various types of contactors, the connection of major loop and disjunction are realized by the traditional switch of solid-state relay control by computing machine, according to different sequential, control corresponding switch, realize the contactor electrical endurance test of various use classes, can not carry out the overload characteristics test; 2) parameter measurement and data handling system are developed in US Westinghouse company and centre of development, and this system can detect parameters such as trial voltage, electric current, has 10 sense channels, sampling interval 77 μ s, measuring accuracy 1%, still, this equipment can only be used for parameter detecting, can not control the process of test; 3) domestic, what Lu Jianguo, Li Zhigang professor chief editor's " electrical apparatus test technology and test method " and Lu Jianguo, professor Zhang Naikuan edited " discusses the conventional method of isolating switch overload characteristics verification in the treatise such as Machine Tool Electric Appliance verification test handbook.4) in moulded case circuit breaker life experiment device, designed a kind of mode that drives circuit breaker handle with pneumatic operator and realized test unit the closing of isolating switch/sub-switching operation, this device has been realized a kind of " soft " operation, but non-contact status monitoring function in the process of the test.5) move in the trip-gear platform in the wink of moulded case circuit breaker being carried out moving trip-gear of wink, be provided with the peak current detection device, adopt the method that detects the test current peak value to measure wink dynamic test electric current, solved the problems of measurement of the actuation time of electrical apparatus release simultaneously.6) Shanghai Electric Appliances Science Inst carries out the used test unit of fail-test to moulded case circuit breaker and can only carry out the test of operating characteristic reliability aspect, is to carry out with the method for intermediate detection and examination back verification with conventional testing equipment for the check of electrical apparatus release defencive function.
In order to ensure and to improve the low-pressure electronic equipment product quality, guarantee the overload reliability of breaker of plastic casing, press for a kind of overload reliability test assembly for plastic case breakers that adopts direct control of computing machine and detection technique.
Summary of the invention
The object of the present invention is to provide a kind of overload reliability test assembly for plastic case breakers and implementation method, this device can be realized automatic adjusting, the automatic steady current of test current, can also finish whole breaker of plastic casing overload fail-test automatically, realize the automatic record of test figure and the automatic record of fault data, and can realize shielding the Test to Failure sample automatically, and do not influence the test of other test specimen.This test unit can also carry out the output and the printing of test figure, is the test unit that can control automatically and write down.
The device of a kind of breaker of plastic casing overload fail-test provided by the invention comprises hardware and software two parts, and software section is made up of operational factor demonstration and modified module, document processing module, debugging test module, overload characteristics cyclic test module; Hardware components is made up of industrial computer, trial voltage and current detection circuit, control circuit, test specimen state detection circuit, big current generating circuit, electric current gear regulating circuit, balanced loop commutation circuit.Industrial computer is made of display, main frame, keyboard, computing machine links to each other with current detection circuit, control circuit, test specimen state detection circuit with trial voltage by bus interface, and control circuit, test specimen state detection circuit, big current regulating circuit, electric current gear regulating circuit, balanced loop commutation circuit link to each other with test specimen.
Trial voltage and current detection circuit comprise voltage transformer (VT), current transformer, voltage amplifier, A/D converter; Mutual inductor, voltage amplifier, A/D converter link to each other successively.A/D converter is connected with computing machine, and two experiment power supplies are connected with two voltage transformer (VT) respectively, and loop current is connected with current transformer.
Control circuit comprises solid-state relay, contactor J1-contactor J19; Its connected mode is: computing machine links to each other successively with the coil of solid-state relay, contactor J1-contactor J19.
Test specimen state detection circuit (4) comprises electromagnetic relay, photoisolator, direct supply, its connected mode is: the contact of test specimen links to each other with the coil of electromagnetic relay, direct supply, the contact of electromagnetic relay links to each other with photoisolator, and photoisolator is connected with computing machine again.
Big current regulating circuit 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, secondary side output and breaker of plastic casing test specimen, the current transformer of strong current transformer are connected in series, and current transformer is connected with current detection circuit with trial voltage.
Electric current gear regulating circuit comprises that five are regulated gear, are followed successively by 1500/5,500/5,150/5,50/5,15/5.For satisfying the requirement of test accuracy, adopted the current transformer of two different no-load voltage ratios, be used for little Current Regulation and big Current Regulation, be respectively 0-400A and 0-1500A.Can select corresponding electric current gear according to the debugging test requirement.
The contact of contactor J1-contactor J19 and balance resistance Compositional balance loop switching circuit, its connected mode is: the contact among the contactor J1-J3 is in parallel with J4 after connecting with balance resistance respectively, and be connected in parallel with first test specimen, contact among the contactor J5-J7 is in parallel with J8 after connecting with balance resistance respectively, and be connected in parallel with second test specimen, contact among the contactor J9-J11 is in parallel with J12 after connecting with balance resistance respectively, and be connected in parallel with the 3rd test specimen, first test specimen also links to each other with strong current transformer in the big current regulating circuit (5), the 3rd test specimen also links to each other with electric current gear regulating circuit (6), links to each other with strong current transformer in the big current regulating circuit (5) again.
The step that overload reliability test assembly for plastic case breakers implementation method provided by the invention comprises:
1) passes to 1.05 times rated current, the contact of monitoring test sample then, the contacts status of breaker of plastic casing does not change in the time of setting, test specimen is normal, in the time that the contacts status of breaker of plastic casing is being set, change, test specimen is a fault, can the Test to Failure sample be shielded by the contactor J1-J12 on the commutation circuit of balanced loop;
2) to the rated current of logical 1.3 times of test specimen, the contacts status of breaker of plastic casing changed in the time of setting, and test specimen is normal, otherwise test specimen is a fault, by contactor J1-J12 the Test to Failure sample is shielded; Test specimen is returned to cold conditions;
3) logical 3.0 times of rated current, the contacts status of breaker of plastic casing device did not change in the time of setting, and test specimen is normal, otherwise breaker of plastic casing is a fault, by contactor J1-J12 the Test to Failure sample is shielded;
4) to the rated current of logical 0.9 times of test specimen, the contacts status of breaker of plastic casing did not change in the time of setting, and test specimen is normal, otherwise test specimen is a fault, by contactor J1-J12 the Test to Failure sample is shielded;
By above process of the test, constitute a test circulation, breaker of plastic casing is tested repeatedly record test cycle index and test fault.
The present invention's beneficial effect and advantage compared with prior art:
(1) overload reliability test assembly for plastic case breakers of the present invention can be finished the breaker of plastic casing reliability compliance test automatically, does not need in test manual intervention, has shortened the whole test time.
(2) overload reliability test assembly for plastic case breakers of the present invention has two cover power supplys, behind the employing dual power supply, can shorten switching time and adjusting time between the different tests electric current, improves the accuracy of test findings.Simultaneously, can also carry out returned to the attribute testing of 3.0 times of rated current.
(3) overload reliability test assembly for plastic case breakers of the present invention can be provided with and revise test parameters, and these test parameterss comprise the test period under 1.05 times, 1.3 times, 3.0 times, 0.9 times rated current, quick equivalent test electric current and the corresponding test current thereof.
(4) test current among the present invention is by computer-controlled, when the test specimen resistance in circuit changes and during mains fluctuations, it is constant that test current keeps;
(5) overload reliability test assembly for plastic case breakers of the present invention carries out automatic record to the overload test time, when the output state of breaker of plastic casing changes, 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 breaker of plastic casing reliability;
(6) 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;
(7) can test M1-100, M1-225 model breaker of plastic casing, test specimen is fixed by air-actuated jaw, convenient and reliable connection; And the output current joint is provided, can test at 400A and following product other model rated current.
(8) can carry out separate unit test specimen test, also can test all test specimens, 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 big current regulating circuit structural representation of the present invention.
Fig. 3 is a control circuit structural representation of the present invention.
Fig. 4 is a test specimen state detection circuit structural representation of the present invention.
Fig. 5 is a test run computer programme flow diagram of the present invention.
Fig. 6 is an embodiment of the invention circuit diagram.
Embodiment
Further narrate the present invention below in conjunction with embodiment and accompanying drawing thereof, but it does not limit the invention.
As shown in Figure 1, overload reliability test assembly for plastic case breakers of the present invention comprises computer control cabinet and experiment cabinet, the computer control cabinet comprises industrial computer 1, trial voltage and current detection circuit 2, control circuit 3, test specimen state detection circuit 4, experiment cabinet comprises big current regulating circuit 5, electric current shift adjusting circuit 6, balanced loop commutation circuit 7, its connected mode is: industrial computer respectively with trial voltage and current detection circuit 2, control circuit 3, test specimen state detection circuit 4 links to each other, control circuit 3 and big current regulating circuit 5, electric current shift adjusting circuit 6, balanced loop commutation circuit 7 links to each other, trial voltage and current detection circuit 2 and big current regulating circuit 5, electric current shift adjusting circuit 6 links to each other.
Be illustrated in figure 2 as big current regulating circuit 5 of the present invention, test current produces circuit and comprises electric voltage regulator, strong current transformer, current transformer, voltage transformer (VT), 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 and the input of the primary side of strong current transformer, voltage transformer (VT) links to each other, the secondary side output and the breaker of plastic casing of strong current transformer, current transformer is connected in series, current transformer, voltage transformer (VT) is connected with current detection circuit 2 with trial voltage, 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 specimen 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.
Be illustrated in figure 3 as control circuit 3 of the present invention and balance loop switching circuit 4, control circuit 3 comprises solid-state relay, contactor J1-contactor J19, the contact of contactor J1-contactor J19 and balance resistance Compositional balance loop switching circuit, its connected mode is: computing machine and solid-state relay, the coil of contactor J1-contactor J19 links to each other successively, contact among the contactor J1-J3 is in parallel with J4 after connecting with balance resistance respectively, and be connected in parallel with first test specimen, contact among the contactor J5-J7 is in parallel with J8 after connecting with balance resistance respectively, and be connected in parallel with second test specimen, contact among the contactor J9-J11 is in parallel with J12 after connecting with balance resistance respectively, and be connected in parallel with the 3rd test specimen, first test specimen also links to each other with strong current transformer in the big current regulating circuit (5), the 3rd test specimen also links to each other with electric current gear regulating circuit (6), links to each other with strong current transformer in the big current regulating circuit (5) again.J1-J19 is 19 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-J19, it tests the first test specimen closed pair, select suitable contactor closure in J1-J4, test specimen action or excision back replace test specimen to constitute the test loop with the balanced loop.In like manner contactor J5-J8 controls the test of second test specimen, and contactor J9-J12 controls the test of the 3rd test specimen.
Be illustrated in figure 4 as test specimen state detection circuit of the present invention, the contact of test specimen links to each other with the coil of electromagnetic relay, direct supply, and the contact of electromagnetic relay links to each other with photoisolator, and photoisolator links to each other with computing machine again.The energising of test specimen contact closure electromagnetic relay, the photoisolator conducting, computing machine receives low level signal, and the test specimen contact disconnects, not conducting of photoisolator, computing machine receives high level signal.On behalf of the digital signal of test specimen contact state, computing machine will read in, and realize judging to crossing the monitoring of breaker of plastic casing contact state whether breaker of plastic casing moves.
Overload reliability test assembly for plastic case breakers of the present invention is finished breaker of plastic casing overload fail-test under computer control, flow chart as shown in Figure 5, its test run program is:
(1) operation breaker of plastic casing overload fail-test program after computing machine powers on;
(2) judged whether test menu item selection operation (click or keyboard input), do not repeated for the 2nd step when having test menu item selection operation, changeed for the 3rd step when test menu item selection operation is arranged;
(3) judge whether to test parameters is provided with function menu, if not changeed for the 4th step, if then carry out following processing:
Carry out the parameter setting by mouse and keyboard, industrial computer is preserved the operational factor of setting automatically.Operational factor comprises: being failure to actuate the time under test product load current value, the 1.05 times of rated current, 1.3 actuation time under the rated current doubly, 3.0 being failure to actuate the time under the rated current doubly, 0.9 being failure to actuate the time under the rated current doubly, the short-time test electric current, the test specimen model allows the number of stoppages, parameters such as test number (TN).After operational factor is set, preserve and the demonstration operational factor, changeed for the 2nd step then.
(4) judge whether to handle menu into test documentation, if not just changeed for the 5th step, if then carry out following processing:
File processing has comprised the storage of data file, the instant playback of calling in, detect data and printing etc.Can preserve test figure automatically, and can read former test figure, test figure can be presented on the graphoscope or by printer simultaneously and carry out output print.After data processing is finished, changeed for the 2nd step.
(5) judge whether to be the commissioning test menu, if not changeed for the 6th step, if then carry out following processing:
Commissioning test comprises functional modules such as the test of trial voltage current detecting, current stabilization, test product deciliter, power supply lifting and linearity correction.Carry out the linearity correction of control, accessory power supply lifting test and institute's image data of the adjusting of detection, scheduled current of supply voltage and loop current and stable, test product divide-shut brake respectively.These modules are finished preparation and the test job before the official test, are used for that detection line connects, test product installation situation and the data acquisition precision of integrated circuit board and the accuracy of control.After the debugging module operation is finished, changeed for the 2nd step.
(6) judge whether to be overload reliability cyclic test operation menu, if not changeed for the 7th step, if then carry out following processing:
Whole fail-test is carried out by the test run 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 fault mode.
This function module is controlled by the connection and the disjunction of 3 pairs of big current regulating circuits 5 of control circuit, electric current gear regulating circuit 6 and balance loop switching circuit 7; In operating process, pass through the parameters such as electric current in voltage and current detection circuit 2 detection pressure regulator output voltages and the test product place test major loop, by determining program relevant in the main frame, the parameter signal that is collected is handled, accurately regulate and control by 3 pairs of tests of control circuit main circuit current again, after being adjusted to the current value of test determination, test product is tested, judged the dropout situation and the log of test product.When a test product breaks down, the fault test product is shielded, continue the test of other test product by the balanced loop commutation circuit.After test run is finished, changeed for the 2nd step.
(7) judge whether to withdraw from menu for test, if not just changeed for the 2nd step, if then withdraw from breaker of plastic casing overload fail-test.
Provided the physical circuit of breaker of plastic casing overload fail-test of the present invention as shown in Figure 6.
In the test specimen state detection circuit 4 among Fig. 6, the test specimen action, the electromagnetic relay energising, the relay normally open contact closure, normally closed contact disconnects, and the signal that normally-open normally-close is input to computing machine respectively is high level and low level.On behalf of the digital signal of test specimen contact state, computing machine will read in, and realize judging to crossing the monitoring of breaker of plastic casing contact state whether breaker of plastic casing moves.
Electric current gear regulating circuit 6 among Fig. 6 comprises that 5 are regulated gear, are followed successively by 1500/5,500/5,150/5,50/5,15/5.The size of test current in the loop during according to test, the contact J13-J17 of A.C. contactor J13-J17 is used for controlling the selection of corresponding electric current gear.
Computing machine is realized by control circuit 3 and balance loop switching circuit 7 control of test specimen test among Fig. 6, the output connecting resistance R19-R37 of computing machine, resistance R 19-R37 and solid-state relay SSR1-SSR19 controls 19 A.C. contactor J1-A.C. contactor J19, the contact J1-J12 of A.C. contactor controls first test specimen respectively, second test specimen, the test of the 3rd test specimen, it tests the first test specimen closed pair, in J1-J4, select suitable contactor closure, test specimen action or excision back replace test specimen to constitute the test loop with the balanced loop, realize the test control of computing machine to first test specimen, equally, computing machine is realized the test of second test specimen is controlled by contactor J5-J8, and computing machine is by the test control of contactor J9-J12 realization to the 3rd test specimen.
In the big current regulating circuit 5 among Fig. 6, the design has two cover power supplys, resistance R 10, R11, R12, R13, photoelectrical coupler TLP521-1, TLP521-2, TLP521-3, TLP521-4 forms motor M 1, the lifting control circuit of M2, its control end is four delivery outlet controls of computing machine, with M1 is example, 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 specimen 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 specimen loop.Pressure regulator BY1 output meets strong current transformer BL1, and the output of strong current transformer BL1 connects electric current gear regulating circuit 6, and with balanced loop commutation circuit 7 in probe of contactor and test specimen form current return.Adjusting and control that computing machine is realized test current by big current regulating circuit 5.
In the voltage and current detection circuit 2 among Fig. 6, the secondary side connecting resistance R16 of current transformer is converted to voltage in the electric current gear regulating circuit 6, this voltage amplifies via the amplifying circuit that resistance R 17, R18, operational amplifier U1 form, and inputing to A/D converter, A/D converter inputs to computing machine after aanalogvoltage is converted to digital signal.The output terminal of pressure regulator BY1, BY2 carries out voltage acquisition through the input end that resistance enters voltage transformer (VT), the amplifying circuit that this voltage is formed via resistance, operational amplifier amplifies, and inputing to A/D converter, A/D converter inputs to computing machine after aanalogvoltage is converted to digital signal.
Application Example, the breaker of plastic casing that with the rated current is 100A are example when transshipping fail-test, and test method is:
At first test product is passed to the test current of 105A, monitor the contact of test product then, the contacts status of breaker of plastic casing does not change in 7200s, and test product is normal, otherwise test product is a fault.Lead to the test current of 130A then, the contacts status of breaker of plastic casing changes in 7200s, and test product is normal, otherwise test product is a fault.
Specific operation process is as follows:
At first, select power supply automatically according to test current.The test current of 105A selects power supply 1 to regulate, and the test current of 130A selects power supply 2 to regulate.Carry out the balanced loop test of 130A test current earlier, determine summation current transformer loop, needed balanced loop.Call stream function and regulate the 130A electric current.The determining of the adjusting of carrying out the 105A electric current and balanced loop uses the same method.
Transfer the stream method as follows: to determine the number percent electric current that desire is transferred according to the relation of setting between electric current and the rated current,, change and transfer stream number percent if unsuccessful; If success stablized for 3 seconds.Deenergization is surveyed current voltage, and current voltage is regulated the test current value that this magnitude of voltage can obtain to set divided by transferring stream number percent should transfer magnitude of voltage exactly.For example, determine that at first transferring stream number percent is 20%, closed power supply, the electric current of adjusting 0.20*105A, the magnitude of voltage U of detection pressure regulator this moment output 1, deenergization.Control pressure regulator then and boost to U 2/ 0.2, this moment, current in loop was 105A.The control method of test current 130A is also similar.
Stablizing of test current: there are certain deviation in the electric current that regulates according to the method described above and the test current of actual needs, therefore need current stabilization.Detect in real time current in loop and compare with the test current value of needs, control pressure regulator buck, with between the two deviation control within the error allowed band, i.e. the stabilization process of test current.
Begin to test: at first carry out the 105A current testing.Utilize control circuit and motor-operating mechanism to the test product control of closing a floodgate, closed power supply 1.Will detect test product action situation in the process of the test, the test product that has moved will no longer detect, and be recorded as " action early "; If test product all moves, stop the test of this process of the test.Test period arrives, if not action of test product then is recorded as " normally ", opens 0.9I then ePower supply is judged the test product failure conditions, record inefficacy test product.If all test product number of stoppagess arrive, withdraw from test, otherwise continue test.Closed power supply 2 carries out the 130A current testing.Will detect test product action situation in the process of the test, the test product that has moved will no longer detect, and be recorded as " normally "; If test product all moves, stop the test of this process of the test.Test period arrives, if test product does not move, then prolongs the detection of test period, and time expand is 7200s*0.1, detects the action situation of test product in prolonging test period, if the test product action is recorded as " slow motion ", otherwise is recorded as " tripping work ".Opening power 2 is judged the test product failure conditions, record inefficacy test product.If all test product number of stoppagess arrive, withdraw from test, otherwise continue test.
So far, a process testing finishes, and can carry out the test of next process or next round-robin.

Claims (8)

1, a kind of overload reliability test assembly for plastic case breakers, it is made up of computer control cabinet and experiment cabinet, it is characterized in that: the computer control cabinet comprises industrial computer (1), trial voltage and current detection circuit (2), control circuit (3), test specimen state detection circuit (4); Experiment cabinet comprises big current regulating circuit (5), electric current shift adjusting circuit (6), balanced loop commutation circuit (7), its connected mode is: industrial computer links to each other with current detection circuit (2), control circuit (3) with trial voltage respectively, control circuit (3) links to each other with big current regulating circuit (5), electric current shift adjusting circuit (6), balanced loop commutation circuit (7), and trial voltage links to each other with big current regulating circuit (5), electric current shift adjusting circuit (6) with current detection circuit (2).
2, overload reliability test assembly for plastic case breakers according to claim 1, it is characterized in that: described trial voltage and current detection circuit (2) comprise voltage transformer (VT), current transformer, voltage amplifier and A/D converter, its connected mode is: mutual inductor, voltage amplifier and A/D converter link to each other successively, A/D converter is connected with computing machine, two experiment power supplies are connected with two voltage transformer (VT) respectively, and loop current is connected with current transformer.
3, overload reliability test assembly for plastic case breakers according to claim 1, it is characterized in that: described control circuit (3) comprises solid-state relay, contactor J1-contactor J19, its connected mode is: computing machine and solid-state relay, the coil of contactor J1-contactor J19 links to each other successively, contact among the contactor J1-J3 is in parallel with J4 after connecting with balance resistance respectively, and be connected in parallel with first test specimen, contact among the contactor J5-J7 is in parallel with J8 after connecting with balance resistance respectively, and be connected in parallel with second test specimen, contact among the contactor J9-J11 is in parallel with J12 after connecting with balance resistance respectively, and be connected in parallel with the 3rd test specimen, first test specimen also links to each other with strong current transformer in the big current regulating circuit (5), the 3rd test specimen also links to each other with electric current gear regulating circuit (6), links to each other with strong current transformer in the big current regulating circuit (5) again.
4, overload reliability test assembly for plastic case breakers according to claim 1 is characterized in that: described test specimen state detection circuit (4) comprises the detection of test specimen main contact and auxiliary contact; The contact of test specimen links to each other with the coil of electromagnetic relay, direct supply, and the contact of electromagnetic relay links to each other with photoisolator, and photoisolator is connected with computing machine again.
5, overload reliability test assembly for plastic case breakers according to claim 1, it is characterized in that: described big current regulating circuit (5) 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 and the breaker of plastic casing test specimen of strong current transformer, current transformer is connected in series, and current transformer is connected with current detection circuit (2) with trial voltage.
6, overload reliability test assembly for plastic case breakers according to claim 1, it is characterized in that: described electric current gear regulating circuit (6) comprises that five are regulated gear, be followed successively by 1500/5,500/5,150/5,50/5 and 15/5, according to the debugging test requirement, select corresponding electric current gear.
7, overload reliability test assembly for plastic case breakers according to claim 1 is characterized in that: described balanced loop commutation circuit (7) comprises 3 resistance balance loops and 1 short circuit balanced loop.
8, a kind of overload reliability test assembly for plastic case breakers implementation method is characterized in that the step that comprises:
1) passes to 1.05 times rated current, the contact of monitoring test sample then, the contacts status of breaker of plastic casing does not change in the time of setting, test specimen is normal, in the time that the contacts status of breaker of plastic casing is being set, change, test specimen is a fault, can the Test to Failure sample be shielded by the contactor J1-J12 on the commutation circuit of balanced loop;
2) to the rated current of logical 1.3 times of test specimen, the contacts status of breaker of plastic casing changed in the time of setting, and test specimen is normal, otherwise test specimen is a fault, by contactor J1-J12 the Test to Failure sample is shielded; Test specimen is returned to cold conditions;
3) logical 3.0 times of rated current, the contacts status of breaker of plastic casing device did not change in the time of setting, and test specimen is normal, otherwise breaker of plastic casing is a fault, by contactor J1-J12 the Test to Failure sample is shielded;
4) to the rated current of logical 0.9 times of test specimen, the contacts status of breaker of plastic casing did not change in the time of setting, and test specimen is normal, otherwise test specimen is a fault, by contactor J1-J12 the Test to Failure sample is shielded;
Above step 1), 2) or step 1), 2), 3), 4) constitute a test circulation, breaker of plastic casing is tested repeatedly record test cycle index and test fault.
CN2009100676831A 2009-01-14 2009-01-14 Overload reliability test assembly for plastic case breakers and implementing method thereof Expired - Fee Related CN101464496B (en)

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