CN204832483U - Calibrating device of big current test equipment - Google Patents
Calibrating device of big current test equipment Download PDFInfo
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- CN204832483U CN204832483U CN201520607587.2U CN201520607587U CN204832483U CN 204832483 U CN204832483 U CN 204832483U CN 201520607587 U CN201520607587 U CN 201520607587U CN 204832483 U CN204832483 U CN 204832483U
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Abstract
The utility model discloses a calibrating device of big current test equipment, including single chip microcomputer system, solid -state voltage regulator, solid state relay, rectifier bridge, square wave generator, current transformer, display screen, control panel, switch, control transformer, rectification voltage stabilizing circuit, logic level transfer scheme, calibration module, the calibration module includes relay switching circuit and alignment coil, and the alignment coil is provided with three taking a percentage, and square wave generator's input is provided with solid state relay 0 and solid state relay 1. The utility model discloses small, the light in weight of whole calibrating device, required power capacity is little, as long as there is ordinary 220V power supply to use, general office place all can be used, be convenient for trace to the source, it is with low costs to trace to the source, calibrate with low costsly, the calibration realizes moving, the similar ordinary computer mainframe size of whole device, and it is together integrated totally, there is not the installation and debugging process, plug -and -play.
Description
Technical field
The utility model belongs to high-current test equipment technical field, is specifically related to a kind of calibrating installation of high-current test equipment.
Background technology
The output current of electric resistance welding equipment (also claiming resistance welder) or similar devices (as magnet charger) is very large, generally in kiloampere (kA) and Wan An training (10kA) rank, for demarcating and/or testing its electric current, people research and develop and have manufactured a kind of high-current test device (being commonly called as great current tester) testing 2kA ~ 200kA.This great current tester is based on Luo-coil as current sensor, and Luo-coil is variable quantity (the i.e. differential signal obtaining tested electric current
), the internal circuit of instrument obtains the value of tested electric current again by anomalous integral digital processing mode.Based on this principle, great current tester both can test alternating current, also can test the electric current of pulsating direct current.In order to ensure accuracy and the consistance of test data, just must calibrate (custom is called metering) great current tester.Current calibration steps has international calibration steps, domestic metering institutes calibration steps and welding machine profession to commonly use calibration steps three kinds, they generally all at least comprise voltage-regulation (thyristor or pressure regulator), current lifting device and benchmark/standard scale system three part, require that large, the volume of power supply capacity is large, heavy (all in hundred kg ranks, generally 200kg should be not less than), peer machine also needs water-cooling system, and therefore traditional calibration steps exists following defect:
1) source used is calibrated very heavy, generally in 100kg ~ 250kg (reason: the general electric current needing calibration is 3.5kA ~ 50kA, need to obtain big current, inevitable input capacity is very large, the parts that some similar current lifting device (as welding transformer) acts on need liquid cooling, and such total quality and volume all can be larger);
2) need to provide larger power supply capacity just can calibrate, capacity all can in tens to hundreds of kVA rank, can only at special place or laboratory investment, can not common and only have the place of 220V socket power to carry out calibrating (reason: need to obtain big current, inevitable input capacity is very large, by regulation, common socket electric current is no more than 16A);
3) transmission of quantity value (metering claims " tracing to the source ") difficulty, and the cost of tracing to the source is very high, and much can only be traceable to 10kA, can trace to the source little (reason: conventional range of current generally at below 5kA, most of measurement unit can not remove the current reference setting up the training of a little Wan An) of 50kA;
4) calibrate cost high (reason: the equipment of calibration Wan An training level of having the ability at present all exist volume large, heavy, take up an area large, equipment cost is high, electricity consumption configuration is large, amortization charge is high);
5) substantially can not realize mobile calibration, the unit that very easily equipment can not be transported to calibration requirements carries out calibrating (reason: calibration system is divided into several large parts, needs dismounting, transport, Installation and Debugging).
Utility model content
The purpose of this utility model is just the calibrating installation providing a kind of high-current test equipment in order to solve the problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of calibrating installation of high-current test equipment, comprise Single Chip Microcomputer (SCM) system, solid-state voltage regulator, solid-state relay, rectifier bridge, square-wave generator and calibration module, the I/O1 port of described Single Chip Microcomputer (SCM) system is connected with logic level carry circuit, the I/O2 port of described Single Chip Microcomputer (SCM) system is provided with display screen, the I/O3 port of described Single Chip Microcomputer (SCM) system is provided with control panel, described calibration module comprises relay commutation circuit and alignment coil, described alignment coil is provided with three taps, described alignment coil is connected with described relay commutation circuit by three described taps, described relay commutation circuit is connected with the I/O4 port of described Single Chip Microcomputer (SCM) system by relay drive circuit, described solid-state voltage regulator is connected with described solid-state relay, described rectifier bridge is connected in parallel on the output terminal of described solid-state relay, described square-wave generator is connected in parallel on the output terminal of described rectifier bridge, the input end of described square-wave generator is provided with commutation diode and switch contact, the input end of described solid-state voltage regulator is provided with power switch, control transformer is provided with in circuit between described power switch and described solid-state voltage regulator, described control transformer is connected with regulator rectifier circuit, the voltage-regulation port of described solid-state voltage regulator is connected with the first output terminal of described logic level carry circuit by the first driving circuit, the control end of described solid-state relay is connected with the second output terminal of described logic level carry circuit by the second driving circuit, protection circuit is provided with in circuit between described second driving circuit and described logic level carry circuit, current transformer is provided with in circuit between described solid-state relay and described rectifier bridge, the secondary current output port of described current transformer amplifies precise rectification circuit by signal and is connected with the first AD converter input end of described Single Chip Microcomputer (SCM) system, the power switch pipe control end of described square-wave generator is connected with the I/O5 port of Single Chip Microcomputer (SCM) system described in transistor AND gate by transformer isolation circuit, the output terminal of described square-wave generator is provided with Hall element, the current signal output end of described Hall element is connected with the second AD converter input end of described Single Chip Microcomputer (SCM) system by true effective value converting circuit, two ac input ends of described rectifier bridge, the cathode output end of described rectifier bridge and cathode output end, two power output ends of described square-wave generator are all connected with described relay commutation circuit.
Further, be connected with the I/O2 port of described Single Chip Microcomputer (SCM) system and described logic level carry circuit while of described display screen.
Further, described Single Chip Microcomputer (SCM) system, described regulator rectifier circuit, described first driving circuit, described second driving circuit, described protection circuit, described signal amplify precise rectification circuit, described transformer isolation circuit, described transistor, described true effective value converting circuit, described logic level carry circuit and described relay drive circuit and are all arranged in same PCB.
Further, described relay drive circuit comprises Darlington driving chip, first relay, second relay, 3rd relay, 4th relay, 5th relay and the 6th relay, described first relay, described second relay, described 3rd relay, described 4th relay, the coil of described 5th relay and described 6th relay connects one to one on six output pins of described Darlington driving chip, described first relay, described second relay, described 3rd relay, described 4th relay, described 5th relay and described 6th relay are provided with current-limiting resistance, the input end of described Darlington driving chip is connected on the I/O4 port of described Single Chip Microcomputer (SCM) system.
Further, described relay commutation circuit is by described first relay, described second relay, described 3rd relay, described 4th relay, the normally opened contact composition of described 5th relay and described 6th relay, first normally opened contact of described first relay is arranged on the first power input of described square-wave generator as described switch contact, the first end of described first relay first normally opened contact is connected with the input end of described square-wave generator, second end of described first relay first normally opened contact is connected with the cathode output end of described rectifier bridge and the first end of described second relay first normally opened contact simultaneously, the first end of described 4th relay normally open contact, the first end of described 5th relay normally open contact is connected with three taps of described alignment coil respectively with the first end of described 6th relay normally open contact, second end of described 4th relay normally open contact simultaneously with the second end of described 5th relay normally open contact, second end of described 6th relay normally open contact, the first end of described first relay second normally opened contact, the first end of described 3rd relay second normally opened contact is connected with the first end of described second relay second normally opened contact, second end of described second relay first normally opened contact simultaneously with the first end of described 3rd relay first normally opened contact, the first end of described first relay the 3rd normally opened contact is connected with described alignment coil, second end of described first relay the 3rd normally opened contact passes described Hall element and is connected with the first output terminal of described square-wave generator, second end of described first relay second normally opened contact is connected with the second output terminal of described square-wave generator, the negative pole of described diode is connected with the second source input end of described square-wave generator, the positive pole of described diode is connected with the cathode output end of described rectifier bridge and the second end of described second relay second normally opened contact simultaneously, second end of described 3rd relay second normally opened contact is connected with the first ac input end of described rectifier bridge, second end of described 3rd relay first normally opened contact is connected with the second ac input end of described rectifier bridge.
The beneficial effects of the utility model are:
1, whole calibrating installation volume is little, lightweight;
2, required power supply capacity is little, can use, general Office Space as long as there is common 220V to power;
3, there is solid-state voltage regulator structure, the electric current that more stable can be provided voluntarily, overcome the problem that big current when adopting resistance welder to do calibration source is not easily stable;
4, be convenient to trace to the source, cost of tracing to the source is low, and calibration cost is also low;
5, mobile calibration is achieved, the similar common computer mainframe box size of whole device, and together fully-integrated, there is no Installation and Debugging process, plug and play.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the calibrating installation of high-current test equipment described in the utility model;
Fig. 2 is the structural representation of relay drive circuit described in the utility model;
Fig. 3 is relay commutation circuit described in the utility model and described square-wave generator, syndeton schematic diagram between described transformer isolation circuit and described alignment coil;
Number in the figure: K1-first relay, K2-second relay, K3-the 3rd relay, K4-the 4th relay, K5-the 5th relay, K6-the 6th relay.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As Fig. 1, shown in Fig. 2 and Fig. 3, the utility model comprises Single Chip Microcomputer (SCM) system, solid-state voltage regulator, solid-state relay, rectifier bridge, square-wave generator and calibration module, the I/O1 port of Single Chip Microcomputer (SCM) system is connected with logic level carry circuit, the I/O2 port of Single Chip Microcomputer (SCM) system is provided with display screen, the I/O3 port of Single Chip Microcomputer (SCM) system is provided with control panel, calibration module comprises relay commutation circuit and alignment coil, alignment coil is provided with three taps, alignment coil is connected with relay commutation circuit by three taps, relay commutation circuit is connected with the I/O4 port of Single Chip Microcomputer (SCM) system by relay drive circuit, solid-state voltage regulator is connected with solid-state relay, rectifier bridge is connected in parallel on the output terminal of solid-state relay, square-wave generator is connected in parallel on the output terminal of rectifier bridge, the input end of square-wave generator is provided with diode D and switch contact, the input end of solid-state voltage regulator is provided with power switch, control transformer is provided with in circuit between power switch and solid-state voltage regulator, control transformer is connected with regulator rectifier circuit, the voltage-regulation port of solid-state voltage regulator is connected with the first output terminal of logic level carry circuit by the first driving circuit, the control end of solid-state relay is connected with the second output terminal of logic level carry circuit by the second driving circuit, protection circuit is provided with in circuit between second driving circuit and logic level carry circuit, current transformer is provided with in circuit between solid-state relay and rectifier bridge, the secondary current output port of current transformer amplifies precise rectification circuit by signal and is connected with the first AD converter input end ADC1 of Single Chip Microcomputer (SCM) system, the power switch pipe control end of square-wave generator is connected with the I/O5 port of transistor AND gate Single Chip Microcomputer (SCM) system by transformer isolation circuit, the output terminal of square-wave generator is provided with Hall element, the current signal output end of Hall element is connected with the second AD converter input end ADC2 of Single Chip Microcomputer (SCM) system by true effective value converting circuit, two ac input ends of rectifier bridge, the cathode output end of rectifier bridge and cathode output end, two power output ends of square-wave generator are all connected with relay commutation circuit.
In the present embodiment, be connected with the I/O2 port of Single Chip Microcomputer (SCM) system and logic level carry circuit while of display screen.Single Chip Microcomputer (SCM) system, regulator rectifier circuit, the first driving circuit, the second driving circuit, protection circuit, signal amplify precise rectification circuit, transformer isolation circuit, transistor, true effective value converting circuit, logic level carry circuit and relay drive circuit and are all arranged in same PCB.Relay drive circuit comprises Darlington driving chip, first relay K 1, second relay K 2, 3rd relay K 3, 4th relay K 4, 5th relay K 5 and the 6th relay K 6, first relay K 1, second relay K 2, 3rd relay K 3, 4th relay K 4, the coil of the 5th relay K 5 and the 6th relay K 6 connects one to one on six output pins of Darlington driving chip, first relay K 1, second relay K 2, 3rd relay K 3, 4th relay K 4, 5th relay K 5 and the 6th relay K 6 are provided with current-limiting resistance R, the input end of Darlington driving chip is connected on the I/O4 port of Single Chip Microcomputer (SCM) system.Relay commutation circuit is by the first relay K 1, second relay K 2, 3rd relay K 3, 4th relay K 4, the normally opened contact composition of the 5th relay K 5 and the 6th relay K 6, first normally opened contact K1-1 of the first relay K 1 is arranged on the first power input of square-wave generator as switch contact, the first end of the first relay K 1 first normally opened contact K1-1 is connected with the input end of square-wave generator, second end of the first relay K 1 first normally opened contact K1-1 is connected with the cathode output end of rectifier bridge and the first end of the second relay K 2 first normally opened contact K2-1 simultaneously, the first end of the 4th relay K 4 normally opened contact, the first end of the 5th relay K 5 normally opened contact is connected with three taps of alignment coil respectively with the first end of the 6th relay K 6 normally opened contact, second end of the 4th relay K 4 normally opened contact simultaneously with the second end of the 5th relay K 5 normally opened contact, second end of the 6th relay K 6 normally opened contact, the first end of the first relay K 1 second normally opened contact K1-2, the first end of the 3rd relay K 3 second normally opened contact K3-2 is connected with the first end of the second relay K 2 second normally opened contact K2-2, second end of the second relay K 2 first normally opened contact K2-1 simultaneously with the first end of the 3rd relay K 3 first normally opened contact K3-1, the first end of the first relay K 1 the 3rd normally opened contact K1-3 is connected with alignment coil, second end of the first relay K 1 the 3rd normally opened contact K1-3 passes Hall element and is connected with the first output terminal of square-wave generator, second end of the first relay K 1 second normally opened contact K1-2 is connected with the second output terminal of square-wave generator, the negative pole of diode D is connected with the second source input end of square-wave generator, the positive pole of diode D is connected with the cathode output end of rectifier bridge and second end of the second relay K 2 second normally opened contact K2-2 simultaneously, second end of the 3rd relay K 3 second normally opened contact K3-2 is connected with the first ac input end of rectifier bridge, second end of the 3rd relay K 3 first normally opened contact K3-1 is connected with the second ac input end of rectifier bridge.
Being described as follows of the calibrating installation various piece of high-current test equipment described in the utility model:
Solid-state voltage regulator-by bidirectional thyristor and the standard module parts that forms of isolation regulating circuit, the bidirectional thyristor circuit of inside modules and regulating circuit are isolated on electric.Input 220Vac voltage, apply the size of the conduction angle of the direct current adjustable electric pressure-controlled inside modules thyristor of 0 ~ 10V to adjustable side, can realize output AC voltage adjustable at 0 ~ 220V, this apparatus design is adjustable at 50 ~ 220V.
Solid-state relay-by bidirectional thyristor and the standard module parts that form of isolation photoswitch circuit, the bidirectional thyristor circuit of inside modules and photoswitch circuit are isolated on electrically, when control end obtains the DC voltage of 5 ~ 30V, the bidirectional thyristor of inside modules all can conducting.
Control transformer-for providing required alternating voltage to the regulator rectifier circuit of device, be input as 220Vac, export 2 × 15Vac and 6.3Vac alternating voltage respectively, constrained input isolation on electrically, the capacity of control transformer is 50VA.
Obtain stable+12V ,-12V ,+5V and+3.3V DC voltage after the regulator rectifier circuit-2 × 15Vac obtained from control transformer and 6.3Vac alternating voltage are carried out rectification, filtering, voltage stabilizing respectively ,+3.3V is that voltage stabilizing obtains again on+5V basis.
The voltage output type precision current transformer of current transformer-employing 0.2%, belongs to standardized component.Electric welding machine and the electric current needed for electrical heating are all that the calibration of great current tester and supporting coil thereof all requires calibration current effective value for acting.When calibrating power frequency DC, first relay K 1 first normally opened contact K1-1 is in off-state, the pulsating direct current that " rectifier bridge " exports only flows through alignment coil, then " current transformer " effective value of alternating current of responding at " rectifier bridge " input end is equal with the effective value by being transported to the pulsating direct current of alignment coil after " rectifier bridge " rectification, so power frequency AC and power frequency DC detects the electric current by calibration coil by this mutual inductor.
Rectifier bridge-for withstand voltage is more than the rectification module of 600V.
Diode D-for withstand voltage is more than the commutation diode of 600V, for the high voltage after the inner capacitor filtering after filtering of isolation " square-wave generator ", with ensure " rectifier bridge " afterwards (P3 and P4) be power frequency pulsating direct current (rectification, not filtering) for calibrating the voltage of power frequency DC.
First relay K 1 first normally opened contact K1-1-only closed when calibrating 1kHz intermediate frequency, when calibrating power frequency AC and power frequency DC all in off-state.
Square-wave generator-due to the alignment time very short, do not consider the efficiency of circuit, and electric current is little, so adopt simple single tube on-off circuit, alignment coil is exactly the load of on-off circuit.Consider that single tube on-off circuit has higher peak voltage, adopt the withstand voltage IGBT module more than 1000V to make switching device, and have strict protection circuit.
Hall element-for transmitting the electric current of intermediate frequency of 1kHz, electrical isolation is carried out to forceful electric power loop and control loop simultaneously.
After first driving circuit-utilize the voltage signal provided Single Chip Microcomputer (SCM) system D/A to carry out Linear Amplifer, deliver to the control end of " solid-state voltage regulator ", regulation output voltage.
The setting of the lounge interval after although protection circuit-Single Chip Microcomputer (SCM) program has each calibration parameter point to calibrate and delayed alignment settings; but in order to more reliable; setting and the delayed of the lounge interval after adopting " protection circuit " hardware mode to realize the calibration of each calibration parameter point carry out duplicate protection, mainly prevent the current return calibrated from damaging because of overload.
Second driving circuit-employing switch triode realizes digital output modul, controls opening or turning off of " solid-state relay ".
The output that signal amplifies precise rectification circuit-Voltage Type Current Transformer is voltage signal, but magnitude of voltage is lower, in order to ensure precision, needs to carry out amplification process to this voltage signal.Adopt precise rectification circuit, the ac voltage signal after amplifying is carried out rectification, then sends into the AD converter input end (ADC1) of Single Chip Microcomputer (SCM) system, Single Chip Microcomputer (SCM) system, through over-sampling and data processing, calculates the effective value of power current.
True effective value converting circuit-" Hall element " directly transmits the current intermediate frequency signal of 1kHz, the difference of the calibration current that the duty cycle, delta of this electric current of intermediate frequency is arranged according to 1kHz intermediate frequency and changing, the edge, front and back of square wave is with part spike, Single Chip Microcomputer (SCM) system Direct Sampling is difficult, and the resource taking Single Chip Microcomputer (SCM) system is more.True effective value converting circuit is adopted square wave current signal to be converted to proportional d. c. voltage signal again to the AD converter input end (ADC2) of Single Chip Microcomputer (SCM) system, Single Chip Microcomputer (SCM) system, through over-sampling and data processing, calculates the effective value of 1kHz electric current of intermediate frequency.
Transformer isolation circuit-pulse transformer, for driving the on-off element (IGBT) of square-wave generator, two winding isolation on electrically.Input winding is connected on the collector of+12V and transistor respectively, exports winding and is connected on the control end (G) of on-off element (IGBT) respectively by resistance and launches collection end (E).
Transistor-middle power switch transistor, be connected with Single Chip Microcomputer (SCM) system I/O5 by base resistance, Single Chip Microcomputer (SCM) system square-wave signal is amplified by transistor, and driving transformer is isolated, isolated by isolating transformer, then drive the on-off element (IGBT) of square-wave generator.
The working power of logic level converting circuit-Single Chip Microcomputer (SCM) system is+3.3V, display, pilot lamp, driving circuit etc. peripheral circuit adopts TTL circuit chip, the operating voltage of TTL chip is+5V, need to carry out logic level transition to different operating voltage, it is connected (I/O1) with the I/O mouth of Single Chip Microcomputer (SCM) system.This device adopts ULN20XX series conventional chip to carry out logic level transition.
The parts liquid crystal display of display screen-be standard, arrange and calibration result for display parameter, it is connected (I/O2) with the I/O mouth of Single Chip Microcomputer (SCM) system.
Control panel-arrange and function setting for calibration parameter, it is connected (I/O3) with the I/O mouth of Single Chip Microcomputer (SCM) system.
Relay drive circuit-form primarily of Darlington driver module and current-limiting resistance, it is connected (I/O4) with the I/O mouth of Single Chip Microcomputer (SCM) system.Darlington driver module is made up of many Darlington transistors, the I/O4 mouth of Single Chip Microcomputer (SCM) system exports different codings, drive corresponding transistor turns in Darlington driver module, make the relay being connected to+12V and different Darlington transistor collector by current-limiting resistance obtain electric closed, reach the object selecting different calibration current and range.
Single Chip Microcomputer (SCM) system-be a typical single-chip minimum system, the model that single-chip microcomputer is selected is STM32F103ZET6, is ARMCortex-M3 kernel, applies also very typical.The functions such as main practical function setting, logic control output, the output of voltage-regulation parameter, calibration current switch control rule and timing, the generation of 1kHz square wave and Duty ratio control, power frequency and 1kHz electric current of intermediate frequency acquisition and processing, data processing, result output.
Relay commutation circuit-for switching " industrial frequency AC ", " power frequency direct current ", " 1kHz intermediate frequency " three kinds of different calibration currents and the tap switching alignment coil.Ensure that the closed of relay and disconnection are all carry out under no current state, so less demanding to relay in logic from what design.
Alignment coil-this part is the most crucial part of this device, is also to realize employing 10 amperes of level small area analysis inputs, completes the key of 10 kiloampere level correcting currents, is described in detail below:
Generally adopt the method for identical ampere turns to calibrate to high-current test device (or claim great current tester) or its coil (Luo-coil).Ampere turns is exactly the product flowing through the electric current (A) of coil and the number of turn (N) of coil.The maximum calibration current of current standard-required, more than 25kA, just must ensure that ampere turns in the enveloping surface of the coil being calibrated instrument is more than 25000.
Difficult point is the design of coil, want weight reduction, reduce volume, first will cancel the current lifting device in existing method or welding transformer, the electric current being input to coil is dropped to 10 amperes of levels from kiloampere rank, the electric current of coil directly obtains from common 220V power supply.Its secondary consideration coil must be applicable to electric current of intermediate frequency, and ensures the linearity.Specific as follows:
Designing requirement: 1). input voltage 220V, input current is not more than 16 amperes; 2). ampere turns is greater than 25000; 3). be applicable to the intermediate frequency of 1kHz, and ensure the linearity; 4). in order to the inspection streamline circle being applicable to be calibrated instrument passes and closed loop, the interior empty size of coil is not less than 45mm × 45mm, and length is not more than 120mm; 5). coil temperature increase during normal use must not be greater than 125K.
Design proposal and difficult point: 1). in order to obtain the linearity that high frequency response is become reconciled, adopting hollow coil, and having preferably length-diameter ratio.2). the internal resistance Rg of coil and induction reactance ZL forms impedance Z jointly, hollow coil impedance Z and number of turn N square, interior empty size and physical dimension is directly proportional, be inversely proportional to the wire diameter of loop length, wire, the physical dimension of type circle is directly proportional to the wire diameter of wire again.3). coil turn is too many, and impedance Z is very large, and the electric current under 220V state is very little, can not meet ampere turns requirement; Very little, impedance Z reduces coil turn, and electric current under 220V state increases, more than 16 amperes, also because of the number of turn very little, ampere turns does not also reach requirement.
Solution: the mathematical model setting up ampere turns, if in coil, sky is of a size of a × b, the number of turn is N, loop length is L, diameter of wire is
physical dimension again a, b, L and
determine, then the function of ampere turns can be: f (a, b, N, L,
).By Computer Simulation, find that the ampere turns of coil can only occur larger value within the specific limits, N is too large or too littlely all can not meet the demands.Verify by experiment again, adopt coil tap, to meet the requirement of the linearity, frequency response and range, finally determine that the span of coil turn is between 100 circle to 5000 circles, and carry out tap.
In order to meet the requirement of intermediate frequency, in intermediate frequency situation, adopting the number of turn (tap extraction) fewer than power frequency, reducing time constant, improve current-rising-rate.
The principle of work of the calibrating installation of high-current test equipment described in the utility model is as follows:
The parameter that Single Chip Microcomputer (SCM) system sets according to control panel, control voltage is exported to the first driving circuit by D/A port, what the first driving circuit provided voltage according to single-chip microcomputer provides regulation voltage with being in proportion, and makes the output of solid-state voltage regulator obtain a default voltage.After the signal that " calibration " that single-chip microcomputer receives control panel button starts; an enabling signal is exported immediately to " protection circuit "; if " protection circuit " is within the non-protected phase; to enabling signal be passed to " the second driving circuit " immediately, " the second driving circuit " output HIGH voltage, makes solid-state relay open-minded; if " protection circuit " is also within the protection period; control panel has yellow indicator lamp display, and block enabling signal, " solid-state relay " is not open-minded.This device is according to the selection of control panel to the size of the electric current that " power frequency AC ", " power frequency DC ", " 1kHz intermediate frequency " and calibration are arranged, Single Chip Microcomputer (SCM) system I/O4 exports different codings to " relay drive circuit ", makes the corresponding relay of " relay commutation circuit " adhesive." rectifier bridge " of device is when selecting " power frequency DC " to calibrate, and after being switched, exports the pulsating current after industrial frequency rectifying to calibration coils special by relay." square-wave generator " of device is when selecting " 1kHz intermediate frequency " to calibrate, and after being switched, exports 1kHz electric current of intermediate frequency to calibration coils special by relay.Single Chip Microcomputer (SCM) system starts timing after sampling electric current simultaneously, and when the time reaches the time of calibration setting, Single Chip Microcomputer (SCM) system, to " protection circuit " output low level, is cut off " solid-state relay ".Single-chip microcomputer carries out current data process, and calculates actual conduction time, finally shows calibration result.
The calibration steps of the calibrating installation of high-current test equipment described in the utility model is as follows:
One, adopt 100 circle to 5000 circle hollow coils of band tap as alignment coil, by by school instrument by school coil through alignment coil, inductance value when tap is to obtain wider range and reducing the calibration of 1KHz intermediate frequency.
Two, by the selection of the calibrator quantity on control panel, can calibrate current effective value and the conduction time of industrial frequency AC, power frequency direct current (pulsating direct current) and 1kHz intermediate frequency respectively, calibration result latches automatically.
Three, calibration range: 1, electric current: 0.5kA ~ 30kA
2, the time: 100ms ~ 2000ms
, also can not there is drift and instability in four, calibrating principle: 1, set the number of turn of alignment coil as N (circle), the number of turn of alignment coil every grade can be determined respectively, and does not change.2, set by the electric current of alignment coil as I1 (A), regulate power-frequency voltage by solid-state voltage regulator or regulate electric current of intermediate frequency by square-wave generator, electric current I 1 is changed between 0.5A ~ 16A adjustable, and it is relatively stable, the value of I1 is in common range of current, is easy to accomplish high-acruracy survey (metering).3, by the coil (sometimes an alignment coil) that is calibrated through alignment coil center pit, and form complete closed loop, by great current tester (if only alignment coil is just with integrator or oscillograph) read current I2 (kA).From the principles of electric and electronic engineering: I2=(N × I1) ÷ 1000 (kA).The calibration of time is relatively easy, compares the size with setting current value, exceedes setting current value and just starts counter, just stop counting lower than setting current value, finally shows cycle or is converted to time (unit is millisecond ms) display.
Special instruction: this method is not suitable for non-Roche principle and (obtains
as sampled signal) other current measurement instruments and the calibration of sensor.
Five, result: by choosing of the optimum length-diameter ratio of demonstration test and alignment coil, accuracy and the linearity of calibration all meet the demands, and by examination and accept, come into operation.
There is following advantage in the calibrating installation of high-current test equipment described in the utility model:
1, whole calibrating installation very little, very light (being less than 20kg).Under calibrating maximum current and reaching the prerequisite of 30kA, whole calibrating installation below 20kg (being convenient to aircraft delivery), and package unit is all integrated in a cabinet, easy to carry, also can be placed directly on table and use.
2, required power supply capacity is very little, can use, general Office Space as long as there is common 220V to power.
3, transmission of quantity value (metering claims " tracing to the source ") easily, and the cost of tracing to the source is low.Reference current part is within 16A, as long as the unit having current parameters to calibrate qualification all can realize trace to the source (general local level measurement unit has this ability).
4, cost is calibrated low.
5, be easy to realize mobile calibration, the similar common computer mainframe box size of whole system (device), and together fully-integrated, there is no Installation and Debugging process, plug and play.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included in protection domain of the present utility model.
Claims (5)
1. the calibrating installation of a high-current test equipment, it is characterized in that: comprise Single Chip Microcomputer (SCM) system, solid-state voltage regulator, solid-state relay, rectifier bridge, square-wave generator and calibration module, the I/O1 port of described Single Chip Microcomputer (SCM) system is connected with logic level carry circuit, the I/O2 port of described Single Chip Microcomputer (SCM) system is provided with display screen, the I/O3 port of described Single Chip Microcomputer (SCM) system is provided with control panel, described calibration module comprises relay commutation circuit and alignment coil, described alignment coil is provided with three taps, described alignment coil is connected with described relay commutation circuit by three described taps, described relay commutation circuit is connected with the I/O4 port of described Single Chip Microcomputer (SCM) system by relay drive circuit, described solid-state voltage regulator is connected with described solid-state relay, described rectifier bridge is connected in parallel on the output terminal of described solid-state relay, described square-wave generator is connected in parallel on the output terminal of described rectifier bridge, the input end of described square-wave generator is provided with diode and switch contact, the input end of described solid-state voltage regulator is provided with power switch, control transformer is provided with in circuit between described power switch and described solid-state voltage regulator, described control transformer is connected with regulator rectifier circuit, the voltage-regulation port of described solid-state voltage regulator is connected with the first output terminal of described logic level carry circuit by the first driving circuit, the control end of described solid-state relay is connected with the second output terminal of described logic level carry circuit by the second driving circuit, protection circuit is provided with in circuit between described second driving circuit and described logic level carry circuit, current transformer is provided with in circuit between described solid-state relay and described rectifier bridge, the secondary current output port of described current transformer amplifies precise rectification circuit by signal and is connected with the first AD converter input end of described Single Chip Microcomputer (SCM) system, the power switch pipe control end of described square-wave generator is connected with the I/O5 port of Single Chip Microcomputer (SCM) system described in transistor AND gate by transformer isolation circuit, the output terminal of described square-wave generator is provided with Hall element, the current signal output end of described Hall element is connected with the second AD converter input end of described Single Chip Microcomputer (SCM) system by true effective value converting circuit, two ac input ends of described rectifier bridge, the cathode output end of described rectifier bridge and cathode output end, two power output ends of described square-wave generator are all connected with described relay commutation circuit.
2. the calibrating installation of high-current test equipment according to claim 1, is characterized in that: be connected with the I/O2 port of described Single Chip Microcomputer (SCM) system and described logic level carry circuit while of described display screen.
3. the calibrating installation of high-current test equipment according to claim 1, is characterized in that: described Single Chip Microcomputer (SCM) system, described regulator rectifier circuit, described first driving circuit, described second driving circuit, described protection circuit, described signal amplify precise rectification circuit, described transformer isolation circuit, described transistor, described true effective value converting circuit, described logic level carry circuit and described relay drive circuit and be all arranged in same PCB.
4. the calibrating installation of high-current test equipment according to claim 1, it is characterized in that: described relay drive circuit comprises Darlington driving chip, first relay, second relay, 3rd relay, 4th relay, 5th relay and the 6th relay, described first relay, described second relay, described 3rd relay, described 4th relay, the coil of described 5th relay and described 6th relay connects one to one on six output pins of described Darlington driving chip, described first relay, described second relay, described 3rd relay, described 4th relay, described 5th relay and described 6th relay are provided with current-limiting resistance, the input end of described Darlington driving chip is connected on the I/O4 port of described Single Chip Microcomputer (SCM) system.
5. the calibrating installation of high-current test equipment according to claim 4, it is characterized in that: described relay commutation circuit is by described first relay, described second relay, described 3rd relay, described 4th relay, the normally opened contact composition of described 5th relay and described 6th relay, first normally opened contact of described first relay is arranged on the first power input of described square-wave generator as described switch contact, the first end of described first relay first normally opened contact is connected with the input end of described square-wave generator, second end of described first relay first normally opened contact is connected with the cathode output end of described rectifier bridge and the first end of described second relay first normally opened contact simultaneously, the first end of described 4th relay normally open contact, the first end of described 5th relay normally open contact is connected with three taps of described alignment coil respectively with the first end of described 6th relay normally open contact, second end of described 4th relay normally open contact simultaneously with the second end of described 5th relay normally open contact, second end of described 6th relay normally open contact, the first end of described first relay second normally opened contact, the first end of described 3rd relay second normally opened contact is connected with the first end of described second relay second normally opened contact, second end of described second relay first normally opened contact simultaneously with the first end of described 3rd relay first normally opened contact, the first end of described first relay the 3rd normally opened contact is connected with described alignment coil, second end of described first relay the 3rd normally opened contact passes described Hall element and is connected with the first output terminal of described square-wave generator, second end of described first relay second normally opened contact is connected with the second output terminal of described square-wave generator, the negative pole of described diode is connected with the second source input end of described square-wave generator, the positive pole of described diode is connected with the cathode output end of described rectifier bridge and the second end of described second relay second normally opened contact simultaneously, second end of described 3rd relay second normally opened contact is connected with the first ac input end of described rectifier bridge, second end of described 3rd relay first normally opened contact is connected with the second ac input end of described rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520607587.2U CN204832483U (en) | 2015-08-13 | 2015-08-13 | Calibrating device of big current test equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520607587.2U CN204832483U (en) | 2015-08-13 | 2015-08-13 | Calibrating device of big current test equipment |
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| CN204832483U true CN204832483U (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520607587.2U Withdrawn - After Issue CN204832483U (en) | 2015-08-13 | 2015-08-13 | Calibrating device of big current test equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005013A (en) * | 2015-08-13 | 2015-10-28 | 成都三方电气有限公司 | Calibration device for high current test equipment |
| CN106249082A (en) * | 2016-08-30 | 2016-12-21 | 潍柴重机股份有限公司 | A kind of generating set control screen test method and device |
| WO2018018467A1 (en) * | 2016-07-27 | 2018-02-01 | 东莞市广安电气检测中心有限公司 | Method for calibrating short circuit test measurement system for electric appliance |
| CN110188373A (en) * | 2019-04-11 | 2019-08-30 | 汉腾汽车有限公司 | A kind of positive relay switch control method of power battery master |
-
2015
- 2015-08-13 CN CN201520607587.2U patent/CN204832483U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005013A (en) * | 2015-08-13 | 2015-10-28 | 成都三方电气有限公司 | Calibration device for high current test equipment |
| WO2018018467A1 (en) * | 2016-07-27 | 2018-02-01 | 东莞市广安电气检测中心有限公司 | Method for calibrating short circuit test measurement system for electric appliance |
| GB2555888A (en) * | 2016-07-27 | 2018-05-16 | Dongguan Guang An Electrical Testing Centre Co Ltd | Method for calibrating short circuit test measurement system for electric appliance |
| GB2555888B (en) * | 2016-07-27 | 2022-01-05 | Dongguan Guang An Electrical Testing Centre Co Ltd | Method for calibrating electrical equipment short-circuit test measuring systems |
| CN106249082A (en) * | 2016-08-30 | 2016-12-21 | 潍柴重机股份有限公司 | A kind of generating set control screen test method and device |
| CN110188373A (en) * | 2019-04-11 | 2019-08-30 | 汉腾汽车有限公司 | A kind of positive relay switch control method of power battery master |
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