CN102087338A - Overload characteristic test bed of intelligent circuit breaker and control method of overload characteristic test bed - Google Patents
Overload characteristic test bed of intelligent circuit breaker and control method of overload characteristic test bed Download PDFInfo
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Abstract
The invention relates to an overload characteristic test bed of an intelligent circuit breaker and a control method of the overload characteristic test bed. The overload characteristic test bed is characterized by comprising an industrial control computer, an industrial touch display screen and a current stabilized power supply, wherein the industrial control computer is connected with the industrial touch display screen; and the current stabilized power supply comprises a relay control unit, a contactor control unit, a signal processing power supply, a motor forward/reverse rotation loop, an auto-transformer, a mutual-coupled transformer and a primary tap combined circuit on the primary side. The current stabilized power supply has two-stage automatic voltage regulation and one-stage manual voltage regulation functions, and can meet the use requirements of circuit breakers with different impedances. The AC (alternated current) output range of the current stabilized power supply is 10 to 1000 A, and the ratio of the maximal output to the minimal output is 100. The test bed has three current output shifts with different ranges by adopting the industrial control computer to control the tap combination of the primary coil of the transformer, so that the test bed has the advantages of high current stabilization speed and high measurement accuracy; and the unique current stabilization process has less impact on the contact of the circuit breaker.
Description
Technical field
The invention belongs to a kind of low-voltage electrical apparatus testing table, particularly relate to a kind of intelligent breaker overload characteristics testing table and control method thereof.
Background technology
Low-voltage electrical apparatus is the base components of mechanical industry, and the performance of its product and quality directly influence the reliability service of electric system and industrial control system.According to national standard and IEC standard, low-voltage circuit breaker all must comprise the test of overload long delay tripping characteristic before dispatching from the factory.According to this market demand, emerged in large numbers the circuit breaker tripping attribute testing platform of a collection of band constant current output function on the market, the automaticity height, reliable in quality has improved testing efficiency greatly.Important technological parameters comprises: output current scope: AC 100～1000A; Current precision: ± 5%; The testing table output current scope is little as can be seen: maximal value only is ten times of minimum value, can't try out less than the miniature circuit breaker of 100A shell frame electric current, this mainly is could satisfy the output of the maximum output of testing table 1000A electric current because the transformer output voltage is low more, and miniature circuit breaker contact resistance changes persuing depressor output voltage height greatly again, the two is a contradiction, so most of testing table output current scope can not be too wide; And current precision is low, more and more can not satisfy on the market most of intelligent breaker to the current precision requirement.
Summary of the invention
The present invention provides intelligent breaker overload characteristics testing table and the control method thereof that a kind of output current scope is wide, current precision is high for solving the technical matters that exists in the known technology.
The technical scheme that the present invention is taked for intelligent breaker overload characteristics testing table for the technical matters that exists in the solution known technology is: it includes an industrial control computer, an industrial touch screen and a stabilized current supply; Described industrial touch screen links to each other with described industrial control computer by supporting cable; Described stabilized current supply includes: a Switching Power Supply, a relay control unit, contactor control module, signal Processing power supply, motor (M1) rotating loop, autotransformer (TV1) and mutual coupling transformer (T2) and former limit tap combinational circuit thereof; Described Switching Power Supply is attempted by between 220 volts of power supplys, produces 24 volts of power supplys, reaches corresponding ground GND1 and produces 5 volts of power supplys, reaches corresponding ground GND; ((after the control coil of KM1～KM4) connected, be connected in parallel to each other connect 220 volts of power supplys to normal opened contact of each of KA1～KA4) to first～the 4th relay in the described relay control unit again with first of described contactor control module～the 4th contactor respectively; A normal opened contact of the 5th relay (KA5) of described relay control unit is connected on the primary side end of described autotransformer (TV1), and two groups of normal opened contacts of the 6th relay (KA6) and two groups of normally closed contacts insert described motor (M1) rotating loop respectively; 24 volts of positive sources of one termination in described motor (M1) rotating loop, the drain electrode utmost point of another termination field effect transistor (VT1), the source ground (GND1) of field effect transistor (VT1); The grid of described field effect transistor (VT1) links to each other with the emitter of triode (V10); The collector of described triode (V10) connects 24 volts of positive poles, its base stage connects 3 ends of described industrial control computer by the 7th resistance (R7), (24 volts of terminations of the coil of KA1～KA6) are anodal, and the other end connects first～the 6th optocoupler (collector of U1～U6) respectively in proper order for first～six relay of its emitter by the described relay control unit of the 8th resistance (R8) ground connection (GND1); (emitter of U1～U6) links to each other with ground (GND1) described first～the 6th optocoupler, its negative electrode links to each other with ground (GND) respectively, first～the 6th optocoupler (anode of U1～U6) respectively order (R1～R6) connects the 4th～9 end of described industrial control computer by first～the 6th current-limiting resistance; The sliding end that the rotation of described motor (M1) drives described autotransformer (TV1) moves; The signal of first current transformer (CT1) of input end 2 input mutual coupling transformer (T2) secondary of described signal processing unit, the signal of second current transformer (CT2) of input end 1 input mutual coupling transformer (T2) secondary reflection autotransformer (TV1) the sliding end position of described signal processing unit, described signal is input to 2,1 end of described industrial control computer respectively after described signal processing unit amplifies; The former limit of described mutual coupling transformer (T2) includes first～the 4th (four windings of C1～C4), first and second windings (C1, C2) serial connection wherein, third and fourth winding (C3, C4) serial connection; Each is connected in series an end of a normal opened contact of described third and fourth contactor (KM3, KM4) respectively the two ends of the secondary coil of described autotransformer (TV1), and each other end of a normal opened contact of described third and fourth contactor (KM3, KM4) of serial connection respectively of the two ends of the secondary coil of this described autotransformer (TV1) connects the two ends of first winding (C1) and the 4th winding (C4) of described mutual coupling transformer (T2) respectively; The two ends of two normal opened contacts of described second contactor (KM2) connect first winding (C1) and the tie point of second winding (C2) and free end and the tertiary winding (C3) and the tie point of the 4th winding (C4) and the free end of the tertiary winding (C3) of the tertiary winding (C3) of described mutual coupling transformer (T2) respectively; The two ends of a normal opened contact of first contactor (KM1) connect the free end of described second winding (C2) and the tertiary winding (C3) respectively; The link that two terminations of the consequent pole coil of described mutual coupling transformer (T2) are connected with tested isolating switch (K).
The present invention can also adopt following technical scheme: described mutual coupling transformer (T2) secondary has 4 taps (A1, A2, A3, A4), and one of them tap (A4) is a common port; In 3 (A1, A2, A3) in the secondary coil of described mutual coupling transformer (T2) any one is respectively with the link of common port (A4) for being connected with tested isolating switch (K).
The technical scheme that the present invention takes for the control method of above-mentioned intelligent breaker overload characteristics testing table for the technical matters that exists in the solution known technology is: it includes after carrying out the test current setting, and its controlled step is as follows:
1) the pressure regulator rotation is made zero, and connects output current low grade (3 grades) and adjusts load current from 0 slowly rising;
2) load current of adjustment and the test current of setting are compared; Contrast current load current and whether reach the test current of setting or half that reflection pressure regulator position voltage reaches deep low gear electric current (3 grades) full scale;
3) if current load current does not reach the test current of setting or the half that reflection pressure regulator position voltage does not reach deep low gear electric current (3 grades) full scale, return step 2);
4) if current load current reaches the test current of setting or the half that reflection pressure regulator position voltage reaches deep low gear electric current (3 grades) full scale, the corresponding position voltage of test current of extrapolating setting by the ratio and the current pressure regulator position voltage of the test current of setting and current load current, and the current gear number of the final use of record;
Position voltage on the current gear number that 5) will finally use is converted into voltage corresponding on the minimum current shelves number, and continues to adjust pressure regulator and judge whether to reach this position voltage, if do not reach this position voltage, returns step 5);
6) if reach this position voltage, turn-off the minimum current shelves, connect the current gear of record;
7) further adjust pressure regulator, whether the difference of test current of judging actual current value and setting less than 0.5% of the test current of setting, if be not less than 0.5% o'clock of test current of setting, returns step 7);
8) if the difference of the test current of actual current value and setting is less than 0.5% o'clock of test current of setting, whether cut-off current output by the success of display prompts current stabilization, begins to test.
Advantage and good effect that the present invention has are: because the stabilized current supply that the design uses has two-stage automatic Regulation and 1 grade of manual voltage regulation function, can satisfy the user demand of different impedance isolating switchs.Its stabilized current supply output area is wide, can reach AC 10～1000A, and turndown ratio is 100 times.In addition owing to adopt industrial computer control mutual coupling transformer T2 primary coil to carry out the tap combination, the three retaining electric current outputs that make testing table have different ranges are electric current 3, electric current 2, electric current 1, so current stabilization speed is fast, the high and unique steady flow process of measuring accuracy is impacted minimum to contact of breaker.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is a control flow chart of the present invention.
Embodiment
For further understanding content of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
As shown in Figure 1, industrial touch screen links to each other with industrial control computer by supporting cable; Stabilized current supply includes: a Switching Power Supply, a relay control unit, contactor control module, signal Processing power supply, motor M 1 rotating loop, autotransformer TV1 and mutual coupling transformer T2 and former limit tap combinational circuit thereof; Switching Power Supply is attempted by between 220 volts of power supplys, produces 24 volts of power supplys, reaches corresponding ground GND1 and produces 5 volts of power supplys, reaches corresponding ground GND; With after the control coil of the contactor KM1～KM4 of contactor control module is connected, be connected in parallel to each other connects 220 volts of power supplys to each normal opened contact of relay K A1 in the relay control unit～KA4 again respectively; The normal opened contact of the relay K M5 of relay control unit is connected on the primary side end of autotransformer TV1, and two groups of normal opened contacts of relay K A6 and two groups of normally closed contacts insert described motor M 1 rotating loop respectively; 24 volts of positive sources of one termination in motor M 1 rotating loop, the drain electrode of another termination field effect transistor VT1, the source ground GND1 of field effect transistor VT1; The grid of field effect transistor VT1 links to each other with the emitter of triode V10; The collector of triode V10 connect 24 volts anodal, its base stage connects 3 ends of industrial control computer by resistance R 7, its emitter is by resistance R 8 ground connection GND1; 24 volts of one terminations of the coil of the relay K A1 of relay control unit～KA6 are anodal, and the other end connects the collector of optocoupler U1～U6 respectively in proper order; The emitter of optocoupler U1～U6 links to each other with ground GND1, and its negative electrode links to each other with ground GND respectively, and the anode of optocoupler U1～U6 connects the 4th～9 end of industrial control computer respectively in proper order by current-limiting resistance R1～R6; The sliding end that the rotation of motor M 1 drives autotransformer TV1 moves; The signal of the current transformer CT1 of the input end 2 input mutual coupling transformer T2 secondary of signal processing unit, the signal of the current transformer CT2 of the input end 1 input mutual coupling transformer T2 consequent pole limit reflection autotransformer TV1 sliding end position of signal processing unit, adopt integrated transporting discharging such as OP07 that the signal of input port 1,2 is zoomed into the equivalent signal that industrial computer can be discerned in the signal processing unit; Signal is imported 2,1 end of industrial control computer respectively after described signal processing unit amplifies.The former limit tap combinational circuit of mutual coupling transformer T2 includes four windings of C1～C4, and wherein winding C1, C2 are connected in series, winding C3, C4 serial connection; Each is connected in series an end of the normal opened contact of contactor KM3, KM4 respectively the two ends of the secondary coil of autotransformer TV1, and the two ends of the secondary coil of autotransformer TV1 respectively are connected in series the normal opened contact of contactor KM3, KM4 respectively, and the other end of contactor KM3, KM4 normal opened contact connects the two ends of winding C1 and the winding C4 of mutual coupling transformer T2 respectively; The two ends of two normal opened contacts of contactor KM2 connect winding C1 and the tie point of winding C2 and free end and the tie point of winding C3 and winding C4 and the free end of winding C3 of winding C3 of mutual coupling transformer T2 respectively; The two ends of the normal opened contact of contactor KM1 connect the free end of winding C2 and winding C3 respectively.The link that two terminations of the secondary coil of mutual coupling transformer T2 are connected with tested isolating switch K.
In Fig. 1: the feeble signal that signal processing unit input port 2 is gathered the CT1 mutual inductor, and zoom into the signal that is fit to the industrial computer input, by 4 outputs of signal processing unit output port, be input to industrial computer and gather port 2, this signal is converted into actual current to industrial computer and setting value compares, thereby and by industrial computer output port 9 control optocoupler U6 work pilot relay KA6 coils whether electric decision motor M 1 sense of rotation, industrial computer is by output port 3 control triode V10 conductings simultaneously, and then make field effect transistor VT1 conducting, autotransformer TV1 rotation is rotated and driven to motor M 1, change mutual coupling transformer T2 primary coil input voltage, reach the purpose of adjusting output current, this is 1 grade of automatic Regulation.Industrial computer is by output port 6,5 control optocoupler U3 respectively, thereby U2 work control KA3, KA2 relay coil get, it often opens the node closure, contactor KM3, KM2 coil get, it often opens the node closure makes the elementary tap of mutual coupling transformer T2 make up, and primary coil uses C2, C3 parallel connection (1 grade in electric current); Perhaps, industrial computer is by output port 6,4 control optocoupler U3 respectively, thereby U1 work control KA3, KA1 relay coil get, it often opens the node closure, and contactor KM3, KM1 coil get electric, and it often opens the node closure makes the elementary tap of mutual coupling transformer T2 make up, primary coil uses C2, C3 connect (2 grades in electric current); Perhaps, industrial computer is by output port 7,4 control optocoupler U4 respectively, and electric thereby U1 work control KA4, KA1 relay coil get, it often opens the node closure, contactor KM4, KM1 coil get, it often opens the node closure makes the elementary tap of mutual coupling transformer T2 make up, and primary coil uses C1, C2, C3, C4 connect (3 grades in electric current); Under the identical situation of mutual coupling transformer T2 input, primary coil C1, C2, C3, C4 are through behind the various combination, when comparing primary coil without combination, the carrying load ability of mutual coupling transformer T2 secondary has promoted 4 times respectively, 2 times and 1 times, so this method makes that this testing table output current scope is wide, this is again 1 grade of automatic Regulation.Mutual coupling transformer T2 secondary has 4 groups of tap A1, A2, and A3, A4, wherein A4 is a common port, A1, maximum output voltage 12V between the A4; A2, maximum output voltage 6V between the A4; A3, maximum output voltage 3V between the A4, because breaker of plastic casing potline current wide ranges, isolating switch volume are from small to large, the size of isolating switch internal resistance and volume is inversely proportional to, so volume according to isolating switch, select two taps of mutual coupling transformer T2 secondary flexibly, the wherein more little tap that should use big output range of volume, this is 1 grade of manual voltage regulation, make things convenient for the user to obtain high precision, the steady current of wide region.
As shown in Figure 2, wait for always in the program that the user carries out test current and sets; In case after setting, industrial computer control pressure regulator rotates to minimum, 3 grades of turn-on current, the load circuit electric current slowly rises from 0, in the uphill process always with current electric current with set current ratio, current electric current reaches to be set electric current or reacts the half that the pressure regulator position voltage reaches 3 grades of full scales of electric current (0.75V), extrapolates the corresponding position voltage of setting electric current by setting electric current with the ratio of current electric current and current position voltage, and the current gear number of the final use of record; Because current connection is 3 grades in the electric current of output current minimum, the position voltage on the current gear number that finally uses is converted into electric current goes up corresponding voltages for 3 grades, continue to adjust pressure regulator and arrive this position voltage; Cut-off current is 3 grades then, connect the current gear of record, at this moment actual current differs with the setting electric current and has only several amperes, after this enter the fine tuning process, when both differences be lower than set electric current 0.5% the time, cut-off current, the success of prompting user current stabilization, whether need to begin test, after the user confirms, connect the electric current of just having adjusted, test.Because adopt industrial computer control, reaction velocity is fast, computing power is strong, and the above-mentioned current stabilization deadline is in 2s.
Claims (3)
1. intelligent breaker overload characteristics testing table, it is characterized in that: it includes an industrial control computer, an industrial touch screen and a stabilized current supply; Described industrial touch screen links to each other with described industrial control computer by supporting cable; Described stabilized current supply includes: a Switching Power Supply, a relay control unit, contactor control module, signal processing unit, motor (M1) rotating loop, autotransformer (TV1) and mutual coupling transformer (T2) and former limit tap combinational circuit thereof; Described Switching Power Supply is attempted by between 220 volts of power supplys, produces 24 volts of power supplys, reaches corresponding ground GND1 and produces 5 volts of power supplys, reaches corresponding ground GND; ((after the control coil of KM1～KM4) connected, be connected in parallel to each other connect 220 volts of power supplys to normal opened contact of each of KA1～KA4) to first～the 4th relay in the described relay control unit again with first of described contactor control module～the 4th contactor respectively; A normal opened contact of the 5th relay (KA5) of described relay control unit is connected on the primary side end of described autotransformer (TV1), and two groups of normal opened contacts of the 6th relay (KA6) and two groups of normally closed contacts insert described motor (M1) rotating loop respectively; 24 volts of positive sources of one termination in described motor (M1) rotating loop, the drain electrode utmost point of another termination field effect transistor (VT1), the source ground (GND1) of field effect transistor (VT1); The grid of described field effect transistor (VT1) links to each other with the emitter of triode (V10); The collector of described triode (V10) connect 24 volts anodal, its base stage connects 3 ends of described industrial control computer by the 7th resistance (R7), its emitter passes through the 8th resistance (R8) ground connection (GND1); (24 volts of terminations of the coil of KA1～KA6) are anodal, and other end order respectively connects first～the 6th optocoupler (collector of U1～U6) for first of described relay control unit～the 6th relay; (emitter of U1～U6) links to each other with ground (GND1) described first～the 6th optocoupler, its negative electrode links to each other with ground (GND) respectively, first～the 6th optocoupler (anode of U1～U6) respectively order (R1～R6) connects the 4th～9 end of described industrial control computer by first～the 6th current-limiting resistance; The sliding end that the rotation of described motor (M1) drives described autotransformer (TV1) moves; The signal of first current transformer (CT1) of input end 2 input mutual coupling transformer (T2) secondary of described signal processing unit, the signal of second current transformer (CT2) of input end 1 input mutual coupling transformer (T2) secondary reflection autotransformer (TV1) the sliding end position of described signal processing unit, described signal is input to 2,1 end of described industrial control computer respectively after described signal processing unit amplifies; The former limit of described mutual coupling transformer (T2) includes first～the 4th (four windings of C1～C4), first and second windings (C1, C2) serial connection wherein, third and fourth winding (C3, C4) serial connection; Each is connected in series an end of a normal opened contact of described third and fourth contactor (KM3, KM4) respectively the two ends of the secondary coil of described autotransformer (TV1), and each other end of a normal opened contact of described third and fourth contactor (KM3, KM4) of serial connection respectively of the two ends of the secondary coil of this described autotransformer (TV1) connects the two ends of first winding (C1) and the 4th winding (C4) of described mutual coupling transformer (T2) respectively; The two ends of two normal opened contacts of described second contactor (KM2) connect first winding (C1) and the tie point of second winding (C2) and free end and the tertiary winding (C3) and the tie point of the 4th winding (C4) and the free end of the tertiary winding (C3) of the tertiary winding (C3) of described mutual coupling transformer (T2) respectively; The two ends of a normal opened contact of first contactor (KM1) connect the free end of described second winding (C2) and the tertiary winding (C3) respectively; The link that two terminations of the consequent pole coil of described mutual coupling transformer (T2) are connected with tested isolating switch (K).
2. intelligent breaker overload characteristics testing table according to claim 1 is characterized in that: described mutual coupling transformer (T2) secondary has 4 taps (A1, A2, A3, A4), and one of them tap (A4) is a common port; In 3 (A1, A2, A3) in the secondary coil of described mutual coupling transformer (T2) any one is respectively with the link of common port (A4) for being connected with tested isolating switch (K).
3. the control method of a described intelligent breaker overload characteristics testing table is characterized in that: it includes is carrying out after test current sets, and its controlled step is as follows:
1) the pressure regulator rotation is made zero, and connects output current low grade (3 grades) and adjusts load current from 0 slowly rising;
2) load current of adjustment and the test current of setting are compared; Contrast current load current and whether reach the test current of setting or half that reflection pressure regulator position voltage reaches deep low gear electric current (3 grades) full scale;
3) if current load current does not reach the test current of setting or the half that reflection pressure regulator position voltage does not reach deep low gear electric current (3 grades) full scale, return step 2);
4) if current load current reaches the test current of setting or the half that reflection pressure regulator position voltage reaches deep low gear electric current (3 grades) full scale, the corresponding position voltage of test current of extrapolating setting by the ratio and the current pressure regulator position voltage of the test current of setting and current load current, and the current gear number of the final use of record;
Position voltage on the current gear number that 5) will finally use is converted into voltage corresponding on the minimum current shelves number, and continues to adjust pressure regulator and judge whether to reach this position voltage, if do not reach this position voltage, returns step 5);
6) if reach this position voltage, turn-off the minimum current shelves, connect the current gear of record;
7) further adjust pressure regulator, whether the difference of test current of judging actual current value and setting less than 0.5% of the test current of setting, if be not less than 0.5% o'clock of test current of setting, returns step 7);
8) if the difference of the test current of actual current value and setting is less than 0.5% o'clock of test current of setting, whether cut-off current output by the success of display prompts current stabilization, begins to test.
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