CN100426000C - Plastic-casing circuit breaker instantaneous characteristic test device - Google Patents
Plastic-casing circuit breaker instantaneous characteristic test device Download PDFInfo
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- CN100426000C CN100426000C CNB2005100152861A CN200510015286A CN100426000C CN 100426000 C CN100426000 C CN 100426000C CN B2005100152861 A CNB2005100152861 A CN B2005100152861A CN 200510015286 A CN200510015286 A CN 200510015286A CN 100426000 C CN100426000 C CN 100426000C
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Abstract
The present invention relates to an instantaneous characteristic test device for plastic-casing circuit breakers, which is composed of a computer control cabinet and a work cabinet, wherein the computer control cabinet comprises an industrial computer, a detection circuit and a control circuit; the work cabinet comprises a motor, a current regulation circuit and a detection shift of a test object. The industrial computer is respectively connected with the detection circuit and the control circuit; the detection circuit is respectively connected with the current regulation circuit and the detection shift of a test object; the control circuit is connected with the motor and the current regulation circuit successively. The present invention realizes selective switching-on, eliminates the influence of aperiodic components of test current in the test of instantaneous dynamic characteristic debugging, detects the current and voltage parameters of the test circuit at real time, automatically control and regulate with a microcomputer, ensures the precision of the test current, and solves the technical problem of inaccurate test current caused by manual regulation, unequal resistance of the test objects, thermal circuit resistors, room temperature change, etc. In addition, the present invention can compromise various plastic-casing circuit breakers with similar structures, with universality.
Description
Technical field:
The invention belongs to a kind of test unit of isolating switch, particularly a kind of plastic-casing circuit breaker instantaneous characteristic test device that the switch electric equipment products is carried out the instantaneous characteristic debugging test.
Background technology:
Low-pressure plastic shell circuit breaker is the visual plant in the low-voltage electrical apparatus, is used for low-voltage distribution loop, motor or other consumer, is responsible for the electric current under connection, carrying and disjunction normal condition or the non-normal condition (as short circuit).
Along with the continuous development of science and technology, each side such as social production, life are more and more to the consumption of the energy, and the use with electric energy is the most extensive in the various energy.According to statistics, the generating set that a cover is 300,000 kilowatts needs 1,200,000 all kinds of low voltage components supporting with it, comprising 66000 of breaker of plastic casing.It is predicted that the whole nation needs additional issue electric weight 66,000,000,000-77,000,000,000 thousand ten thousand hour in the period of 2001-2005, moves calculatings (1997) in 13.1 hours average every day by national electric power unit, annual in the period of the 2001-2005 need average adding new capacity be about 21,000,000 kilowatts.Therefore, supporting by experience, need 4,620,000 of low-pressure plastic shell circuit breakers every year.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, and the plastic-casing circuit breaker instantaneous characteristic debugging test is the big event in the delivery test, be the effective assurance means that improve the breaker of plastic casing q﹠r, so research plastic-casing circuit breaker instantaneous characteristic debugging technique, development plastic-casing circuit breaker instantaneous characteristic debugging apparatus have important significance for theories and realistic meaning.
The instantaneous characteristic of breaker of plastic casing is according to relevant regulations among the standard GB 14048.2-2001 " low voltage switch equipment and opertaing device low-voltage circuit breaker ", be meant that the low-voltage circuit breaker dropout limit and characteristic should meet following provisions: when test current equal the short-circuit current setting valve 80% the time, electrical apparatus release should be failure to actuate; When test current equal the short-circuit current setting valve 120% the time, electrical apparatus release should move.When the wink of carrying out multipole circuit breaker moving tripping characteristic test, the two poles of the earth of tested electrical equipment should be together in series, pass to that test current is threaded off or not during trip-gear, current duration is 0.2s in the moving tripping characteristic test of wink.
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, and 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 electrical endurance test of various use classes; 2) parameter measurement and data handling system are developed in US Westinghouse company and centre of development, this system can detect parameters such as trial voltage, electric current, have 10 sense channels, sampling interval 77 μ s, measuring accuracy 1% can show and print voltage, current waveform, 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 circuit breaker instantaneous characteristic method of calibration in the treatise such as Machine Tool Electric Appliance verification test handbook.But with modern computing method, control theory and computer technology be applied to circuit breaker instantaneous characteristic debugging innovatively, development novel breaker instantaneous characteristic debugging apparatus also belongs to blank; 4) breaker of plastic casing wink is moved trip-gear, its conventional test method is carried out on the instantaneous checking table that dispatches from the factory at present, by discovering, the isolating switch setting current of instantaneous checking table verification is inaccurate, mainly is because factors such as voltage ripple of power network, test product internal resistance not of uniform sizely cause, the variation of closing phase angle difference, room temperature and test loop changes in resistance cause.
Summary of the invention
The problem to be solved in the present invention is at lacking at present modern computing method, control theory and computer technology to be applied to the circuit breaker instantaneous characteristic debugging test, utilizes the inaccurate present situation of isolating switch setting current of traditional instantaneous checking table verification and a kind of plastic-casing circuit breaker instantaneous characteristic test device is provided.This invention has solved the Several Key Problems in the plastic-casing circuit breaker instantaneous characteristic test: studied the phase selection technology, fast fourier transform method is used for the calculating of mains frequency, circuit power factor and closing phase angle, designed the phase selection device on this basis, eliminate the influence of the aperiodic component of test current in the instantaneous characteristic debugging test, solved medium-term and long-term " existence of aperiodic component causes the false tripping of isolating switch " this technical barrier that exists of isolating switch industry; Electric current, the voltage parameter of real-time detection hookup have been realized, and carry out microcomputer automatic control and regulate, thereby guaranteed the precision of test current, solved the inaccurate technical barrier of test current that causes owing to factors such as manual adjustments, test product resistance do not wait, loop resistance heating, room temperature variations.The plastic-casing circuit breaker instantaneous characteristic test device of the present invention's development does not see that in the design aspect the above-mentioned key issue relevant report is arranged.In addition, the present invention can take into account the various model breaker of plastic casing of similar structures, has certain versatility.
Technical scheme of the present invention is as follows:
The present invention utilizes modularized circuits such as industrial computer, testing circuit and control circuit that breaker of plastic casing is carried out the instantaneous characteristic test, utilizes in test the phase selection technology to eliminate the influence that non-periodic, the test current component was debugged plastic-casing circuit breaker instantaneous characteristic; Utilize electronic pressure regulation and computer control detection technique, detected electric current, the voltage parameter of hookup in real time, and can carry out the adjusting of a plurality of debugging detection gears in 6A～225A scope, the precision of warranty test electric current.
Plastic-casing circuit breaker instantaneous characteristic test device of the present invention comprises computer control cabinet and working cabined; Wherein, the computer control cabinet comprises industrial computer 1, testing circuit 2 and control circuit 3; Working cabined comprises that motor 4, current regulating circuit 5 and test product detect gear 6.Industrial computer 1 links to each other with control circuit 3 with testing circuit 2 respectively; Testing circuit 2 detects gear 6 with current regulating circuit 5 and test product respectively; Control circuit 3 links to each other with current regulating circuit 5 with motor 4 successively.This device has plural test product and detects gear (for example, establish 4 test products and detect gear), can test product be connected to the relevant detection gear according to the debugging test requirement.
Described current regulating circuit 5 comprises that experiment power supply 50, master switch 51, major loop gauge tap 52, ac solid relay 53, electronic automatic coupling voltage regulator 54, group control switch 55, strong current transformer 56, load circuit switch 57, inspection leakage resistance 58, balance resistance 59 and test product detect gear 6; Its connected mode is that experiment power supply 50 detects gear 6 and is connected through signal wire 500, master switch 51, signal wire 501, major loop gauge tap 52, signal wire 502, ac solid relay 53, signal wire 503, electronic automatic coupling voltage regulator 54, signal wire 504, group control switch 55, signal wire 505, strong current transformer 56, signal wire 506, load circuit switch 57, signal wire 507, inspection leakage resistance 58, signal wire 508, balance resistance 59, signal wire 509, test product successively, forms closed test loop after signal wire 510 takes back experiment power supply 50.
Described testing circuit 2 comprises electrical isolator 21,22,23 and high speed data acquisition system 24; Its connected mode is that electrical isolator 21,22,23 links to each other with high speed data acquisition system 24 through signal wire 212,222,232 respectively; Simultaneously, high speed data acquisition system 24 is connected with industrial computer 1 through data line 200; Experiment power supply 50 is connected with electrical isolator 21 through signal wire 211, and strong current transformer 56 secondary are connected with electrical isolator 22 through signal wire 221, and test product detects gear 6 and is connected with electrical isolator 23 through signal wire 231.
Described control circuit 3 comprises data collector 30, ac solid relay 31,32,33,34, gauge tap 35 and motor 4; Its connected mode is that industrial computer 1 is connected with data collector 30 by data line 300, the output interface of data collector 30 is connected with the input end of ac solid relay 31,32,33,34 by signal wire 310,320,330,340 respectively, ac solid relay 31 links to each other with electronic automatic coupling voltage regulator 54 by gauge tap 35, motor 4, ac solid relay 32 links to each other with major loop gauge tap 52, ac solid relay 33 links to each other with group control switch 55, and ac solid relay 34 links to each other with load circuit switch 57.
The present invention compared with prior art has following characteristics:
1, can be simultaneously carry out the instantaneous characteristic test, solve the problem that Industrial Control Computer is controlled test automatically many breaker of plastic casing;
2, the influence that non-periodic, the test current component was debugged plastic-casing circuit breaker instantaneous characteristic that traditional plastic-casing circuit breaker instantaneous characteristic test device produces can be eliminated, the q﹠r of breaker of plastic casing can be improved; Solve Detection ﹠ Controling test current technical matters quick and precisely, overcome the inaccurate shortcoming of test current that causes owing to factors such as manual adjustments, test product resistance do not wait, loop resistance heating, room temperature variations;
3, the test product rated current scope that can debug of test unit is 6A～225A, can obtain the required big electric current of test rapidly and accurately, and obtainable maximum current is 3500A.
4, test unit has 4 debugging detection gears, can test product be connected to the relevant detection gear according to the debugging test requirement.
5, according to the requirement of test, parameters such as test product rated current numerical value can be imported or revise to testing crew;
6, the automatic log of test unit energy can be preserved 500 test figures automatically, can output print detect data and detection waveform;
7, test unit has complete data protection function, and data are not lost behind the accident power-off, does not destroy the data of having gathered behind the power up.
Description of drawings
Fig. 1 is the plastic-casing circuit breaker instantaneous characteristic test device block diagram.
Fig. 2 is the current regulating circuit structural representation.
Fig. 3 is the testing circuit synoptic diagram.
Fig. 4 is the control circuit synoptic diagram.
Fig. 5 is a test run computer programme flow diagram of the present invention.
Fig. 6 is the circuit diagram of plastic-casing circuit breaker instantaneous characteristic test device of the present invention.
Embodiment:
Embodiment 1:
As seen from Figure 1, described plastic-casing circuit breaker instantaneous characteristic test device comprises computer control cabinet and working cabined; Wherein, the computer control cabinet comprises industrial computer 1, testing circuit 2 and control circuit 3; Working cabined comprises that motor 4, current regulating circuit 5 and test product detect gear 6.Industrial computer 1 links to each other with control circuit 3 with testing circuit 2 respectively; Testing circuit 2 detects gear 6 with current regulating circuit 5 and test product respectively and links to each other; Control circuit 3 links to each other with current regulating circuit 5 through motor 4.
Current regulating circuit 5 described in Fig. 1 comprises that experiment power supply 50, master switch 51, major loop gauge tap 52, ac solid relay 53, electronic automatic coupling voltage regulator 54, group control switch 55, strong current transformer 56, load circuit switch 57, inspection leakage resistance 58, balance resistance 59 and test product detect gear 6 as shown in Figure 2; Its connected mode is that experiment power supply 50 detects gear 6 and is connected through signal wire 500, master switch 51, signal wire 501, major loop gauge tap 52, signal wire 502, ac solid relay 53, signal wire 503, electronic automatic coupling voltage regulator 54, signal wire 504, group control switch 55, signal wire 505, strong current transformer 56, signal wire 506, load circuit switch 57, signal wire 507, inspection leakage resistance 58, signal wire 508, balance resistance 59, signal wire 509, test product successively, forms closed test loop after signal wire 510 takes back experiment power supply 50.
Testing circuit 2 described in Fig. 1 comprises electrical isolator 21,22,23 and high speed data acquisition system 24 as shown in Figure 3; Its connected mode is that electrical isolator 21,22,23 links to each other with high speed data acquisition system 24 through signal wire 212,222,232 respectively; Simultaneously, high speed data acquisition system 24 is connected with industrial computer 1 through data line 200; Experiment power supply 50 is connected with electrical isolator 21 through signal wire 211, and strong current transformer 56 secondary are connected with electrical isolator 22 through signal wire 221, and test product detects gear 6 and is connected with electrical isolator 23 through signal wire 231.
Control circuit 3 described in Fig. 1 comprises data collector 30, ac solid relay 31,32,33,34, gauge tap 35 and motor 4 as shown in Figure 4; Its connected mode is that industrial computer 1 is connected with data collector 30 by data line 300, the output interface of data collector 30 is connected with the input end of ac solid relay 31,32,33,34 by signal wire 310,320,330,340 respectively, ac solid relay 31 links to each other with electronic automatic coupling voltage regulator 54 by gauge tap 35, motor 4, ac solid relay 32 links to each other with major loop gauge tap 52, ac solid relay 33 links to each other with group control switch 55, and ac solid relay 34 links to each other with load circuit switch 57.
Fig. 6 is the present embodiment manipulated or operated apparatus, and it mainly is divided into four parts, and part i is the industrial computer 1 among Fig. 1, and part ii is that testing circuit 2, the III among Fig. 1 partly are the control circuit 3 among Fig. 1; IV partly is that motor 4, current regulating circuit 5 and the test product among Fig. 1 detects gear 6, and wherein test product detects gear 6 places has 4 to detect gear test sample selection connection.
Plastic-casing circuit breaker instantaneous characteristic test device described in Fig. 1 carries out the plastic-casing circuit breaker instantaneous characteristic test under industrial computer control, its test run program as shown in Figure 5:
(1) operation plastic-casing circuit breaker instantaneous characteristic test routine 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 be test parameters modify feature menu, if not changeed for the 4th step, if then carry out following processing:
Carry out parameter modification by mouse and keyboard, industrial computer is preserved amended operational factor automatically, moves the parameter that computer-chronograph is called in operation last time automatically in next time.Operational factor comprises: parameters such as test product rated current numerical value, lower current multiple, upper limit current multiple, drop-away time.After revising operational factor, preserve and the demonstration operational factor, changeed for the 2nd step then.
(4) judge whether to be test figure file processing menu, 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 detection waveform and printing etc.Can preserve 500 test figures automatically; And can read former test figure, carry out the demonstration and the printing of data and waveform simultaneously.After data processing is finished, changeed for the 2nd step.
(5) judge whether to be instantaneous characteristic test run menu, if not changeed for the 6th step, if then carry out following processing:
This function module is controlled by the connection and the disjunction of 3 pairs of current regulating circuits 5 of control circuit; In operating process, detect parameters such as electric current, voltage and voltage-phase in the test major loop at test product places by testing circuit 2, 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.After test run is finished, changeed for the 6th step.
(6) judge whether to withdraw from menu for test, if not just changeed for the 2nd step, if then withdraw from the plastic-casing circuit breaker instantaneous characteristic test.
In the 5th step of running test, when carrying out the plastic-casing circuit breaker instantaneous characteristic test, the specific operation process of test is as follows:
At first, industrial computer 1 carries out the break-make control operation by 3 pairs of tests of control circuit regulating loop, determine best closing phase angle, realize phase selection, eliminate the aperiodic component of test current: promptly industrial computer 1 is at first controlled ac solid relay 32,33 and 34 respectively by data collector 30, realization detects the power-factor angle of strong current transformer 56 secondary test loops to the last electric control of the magnetizing coil of major loop gauge tap 52, group control switch 55 and load circuit switch 57
Then, industrial computer 1 is by data collector 30 control ac solid relays 32,33 and 34, realization detects the angle θ of leading its secondary voltage of strong current transformer 56 original edge voltages to the outage control of the magnetizing coil of major loop gauge tap 52, the last electric control of organizing the magnetizing coil of controlling switch 55 and load circuit switch 57; Pass through formula
Determine the closing phase angle on its former limit, carry out phase selection.In the operation that each test major loop is connected, all to pass through this technology, the relevant controlling switch in the test loop is carried out phase selection, to reach the aperiodic component of eliminating test current, avoid purpose to the false judgment of test product characteristic.
Then, when carrying out the plastic-casing circuit breaker instantaneous characteristic test, test routine carries out according to following steps:
1) adjust the rated current of test product in the major loop in test:
When breaker of plastic casing was tested, industrial computer 1 was controlled ac solid relay 32,33 and 34 respectively by data collector 30, realized the phase selection control to major loop gauge tap 52, group control 55 first groups of switches of switch and load circuit switch 57; By rotating control to motor 4, electronic automatic coupling voltage regulator 54 output voltages are regulated, simultaneously, test product detects gear 6 both end voltage and sends industrial computer 1 to through electrical isolator 23, high speed data acquisition system 24, carry out computing, with the load current value of the test product of actual current value after the computing and regulation relatively, the electric current in making the test loop reaches rated current; Industrial computer 1 disconnects load circuit switch 57 through data collector 30, ac solid relay 34; This moment, strong current transformer 56 secondary two ends no-load voltages sent industrial computer 1 to through electrical isolator 22, high speed data acquisition system 24, were recorded as no-load voltage U
N
2) under above-mentioned state, continue to regulate test current:
3) under above-mentioned state, continue to regulate test current:
According to the operation in above-mentioned the 5th step, can test the instantaneous characteristic that test product carries out repeatedly, and carry out the stored record of test figure and waveform.The rated current scope that the test product that this test unit can be debugged detects the test product on the gear 6 is 6A～225A, can obtain the required big electric current of test rapidly and accurately, and obtainable maximum current is 3500A.
Embodiment 2:
Described plastic-casing circuit breaker instantaneous characteristic test device, the motor 4 in the working cabined also can adopt unidirectional electric rotating machine; Can on test product detection gear 6 a plurality of gears be set as required in the working cabined tests many breaker of plastic casing test products.
All the other structures and principle are identical with embodiment 1.
Claims (4)
1, a kind of plastic-casing circuit breaker instantaneous characteristic test device, it is made up of computer control cabinet and working cabined, working cabined comprises motor (4) and current regulating circuit (5), control circuit (3) links to each other with current regulating circuit (5) with motor (4) successively, and the computer control cabinet comprises industrial computer (1), testing circuit (2) and control circuit (3); Industrial computer (1) links to each other with control circuit (3) with testing circuit (2) respectively; It is characterized in that: working cabined comprises that also test product detects gear (6); Testing circuit (2) detects gear (6) with current regulating circuit (5) and test product respectively and links to each other;
Described current regulating circuit (5) comprises experiment power supply (50), master switch (51), major loop gauge tap (52), ac solid relay (53), electronic automatic coupling voltage regulator (54), group control switch (55), strong current transformer (56), load circuit switch (57), inspection leakage resistance (58), balance resistance (59); Its connected mode is that experiment power supply (50) is successively through first signal wire (500), master switch (51), secondary signal line (501), major loop gauge tap (52), the 3rd signal wire (502), ac solid relay (53), the 4th signal wire (503), electronic automatic coupling voltage regulator (54), the 5th signal wire (504), group control switch (55), the 6th signal wire (505), strong current transformer (56), the 7th signal wire (506), load circuit switch (57), the 8th signal wire (507), inspection leakage resistance (58), the 9th signal wire (508), balance resistance (59), the tenth signal wire (509), test product detects gear (6) and is connected, after the 11 signal wire (510) take back experiment power supply (50) and form closed test loop;
Described testing circuit (2) comprises first electrical isolator (21), second electrical isolator (22), the 3rd electrical isolator (23) and high speed data acquisition system (24); Its connected mode is that first electrical isolator (21), second electrical isolator (22), the 3rd electrical isolator (23) link to each other with high speed data acquisition system (24) through first signal wire (212), secondary signal line (222), the 3rd signal wire (232) respectively; Simultaneously, high speed data acquisition system (24) is connected with industrial computer (1) through first data line (200); Experiment power supply (50) is connected with first electrical isolator (21) through the 4th signal wire (211), strong current transformer (56) secondary is connected with second electrical isolator (22) through signal wire (221), and test product detects gear (6) and is connected with the 3rd electrical isolator (23) through the 5th signal wire (231);
Described control circuit (3) comprises data collector (30), first ac solid relay (31), second ac solid relay (32), the 3rd ac solid relay (33), the 4th ac solid relay (34) and gauge tap (35); Its connected mode is that described industrial computer (1) is connected with data collector (30) by second data line (300), the output interface of data collector (30) is respectively by first signal wire (310), secondary signal line (320), the 3rd signal wire (330), the 4th signal wire (340) and first ac solid relay (31), second ac solid relay (32), the 3rd ac solid relay (33), the input end of the 4th ac solid relay (34) connects, first ac solid relay (31) is by gauge tap (35), motor (4) links to each other with electronic automatic coupling voltage regulator (54), second ac solid relay (32) links to each other with major loop gauge tap (52), the 3rd ac solid relay (33) links to each other with group control switch (55), and the 4th ac solid relay (34) links to each other with load circuit switch (57).
2,, it is characterized in that described motor (4) is the rotating motor according to the described plastic-casing circuit breaker instantaneous characteristic test device of claim 1.
3, according to the described plastic-casing circuit breaker instantaneous characteristic test device of claim 1, it is characterized in that this device has plural debugging and detects gear, can test product be connected to the relevant detection gear according to the debugging test requirement.
4,, it is characterized in that this device has 4 debugging and detects gear according to the described plastic-casing circuit breaker instantaneous characteristic test device of claim 3.
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| CNB2005100152861A CN100426000C (en) | 2005-09-29 | 2005-09-29 | Plastic-casing circuit breaker instantaneous characteristic test device |
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| CNB2005100152861A CN100426000C (en) | 2005-09-29 | 2005-09-29 | Plastic-casing circuit breaker instantaneous characteristic test device |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101825672B (en) * | 2010-05-13 | 2011-12-28 | 四川电力试验研究院 | Phase selection switching-in tester with breaker pre-breakdown model |
| CN102353895B (en) * | 2011-06-08 | 2013-05-08 | 河北工业大学 | Low voltage breaker life automatic test apparatus |
| CN104251976B (en) * | 2014-09-24 | 2017-06-06 | 河北工业大学 | A kind of operation method of the protection feature test device of miniature circuit breaker |
| CN104569801A (en) * | 2014-12-27 | 2015-04-29 | 中国西电电气股份有限公司 | Characteristic test device and method for alternating-and-direct-current dual-purpose low-voltage circuit breaker |
| CN112649726B (en) * | 2020-12-08 | 2023-08-25 | 上能电气股份有限公司 | Switch class mechanical life test circuit and method |
| CN113671897A (en) * | 2021-08-26 | 2021-11-19 | 甘肃电器科学研究院 | Electrical test training system |
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| US6472877B1 (en) * | 1997-06-25 | 2002-10-29 | Chevron U.S.A., Inc. | Method and apparatus for measuring the opening time of a medium voltage air circuit breaker |
| US20030009027A1 (en) * | 2000-01-28 | 2003-01-09 | Linden Technologies, Inc., A Delaware Corporation | C-3' protected monomeric nucleotides and synthesis of oligonucleotides on solid support |
| CN1645159A (en) * | 2004-12-31 | 2005-07-27 | 河北工业大学 | Reliability tester for electric leakage protector |
| CN1648679A (en) * | 2004-12-31 | 2005-08-03 | 河北工业大学 | Test device for small breaker reliability |
| CN2821593Y (en) * | 2005-09-29 | 2006-09-27 | 河北工业大学 | Instantaneous property detector for plastic shell breaker |
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2005
- 2005-09-29 CN CNB2005100152861A patent/CN100426000C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6472877B1 (en) * | 1997-06-25 | 2002-10-29 | Chevron U.S.A., Inc. | Method and apparatus for measuring the opening time of a medium voltage air circuit breaker |
| US20030009027A1 (en) * | 2000-01-28 | 2003-01-09 | Linden Technologies, Inc., A Delaware Corporation | C-3' protected monomeric nucleotides and synthesis of oligonucleotides on solid support |
| CN1645159A (en) * | 2004-12-31 | 2005-07-27 | 河北工业大学 | Reliability tester for electric leakage protector |
| CN1648679A (en) * | 2004-12-31 | 2005-08-03 | 河北工业大学 | Test device for small breaker reliability |
| CN2821593Y (en) * | 2005-09-29 | 2006-09-27 | 河北工业大学 | Instantaneous property detector for plastic shell breaker |
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