CN208820689U - Multiple frequence control device and multiple frequence control cabinet - Google Patents

Abstract

It includes multiple frequence control unit, sampling feedback unit that the utility model embodiment, which provides a kind of multiple frequence control device and multiple frequence control cabinet, the multiple frequence control device,；The multiple frequence control unit includes the second input terminal of the feedback signal for accessing the first input end of ac supply signal, for receiving the sampling feedback unit and the output end for exporting multi-frequency signal；The output end of the multiple frequence control unit is used for external product to be tested；The input terminal of the sampling feedback unit is used for the external product to be tested；The output end of the sampling feedback unit is connect with the second input terminal of the multiple frequence control unit.Pressure test can be carried out to transformer, voltage transformer by the multiple frequence control device and the multiple frequence control cabinet, improve the accuracy of test result to a certain extent.

Description

Multiple frequence control device and multiple frequence control cabinet

Technical field

The utility model relates to high-tension testing apparatus fields, in particular to a kind of multiple frequence control device and more times Frequency control cabinet.

Background technique

In entire power industry, the induced over voltage withstand test of transformer and mutual inductor in large and medium-sized substation is to guarantee to become The quality of a depressor important tests that meet national standards.Between the circle of transformer winding, interlayer, section and phase insulation it is vertical absolutely Edge induced over voltage withstand test is then the big event in transformer insulated test.Based on the particularity of minor insulation test, need to pass through Apply frequency doubling device to improve the test voltage to insulate between transformer or mutual inductor winding, to reach the mesh of pressure test 's.Existing frequency doubling device is difficult to provide the test signal of plurality of stable, and correctness is relatively in high voltage induction pressure test It is low.

Utility model content

To overcome the technical problems existing in the prior art, the purpose of this utility model is to provide a kind of controls of multiple frequence Device and multiple frequence control cabinet.

The utility model embodiment provides a kind of multiple frequence control device, including multiple frequence control unit, sampling feedback Unit；

The multiple frequence control unit includes for accessing the first input end of ac supply signal, for receiving described adopt Second input terminal of the feedback signal of sample feedback unit and output end for exporting multi-frequency signal；

The output end of the multiple frequence control unit is used for external product to be tested；

The input terminal of the sampling feedback unit is used for the external product to be tested；

The output end of the sampling feedback unit is connect with the second input terminal of the multiple frequence control unit.

In the alternative embodiment of the utility model, the sampling feedback unit include capacitive divider, voltage transmitter, Amplification module, sampling A/D chip；

The input terminal of the capacitive divider is connect with the product to be tested, the output end of the capacitive divider and the electricity The input terminal of pressure transmitter connects, and the voltage transmitter is connect with the amplification module, the amplification module and the sampling Chip connection, the sampling A/D chip are connect with the multiple frequence control unit；

The capacitive divider, for acquiring the voltage signal of product to be tested output, and according to the voltage signal to The voltage transmitter provides voltage division signal；

The voltage transmitter, for exporting direct current signal；

The sampling A/D chip converts analog signals into digital signal for carrying out data sampling.

In the alternative embodiment of the utility model, the capacitive divider includes HV Terminal, intermediate voltage terminal, low-pressure end Son；

The HV Terminal is used for the external product to be tested；

Medium pressure terminal is connect with the voltage transmitter；

The low-voltage terminal ground connection.

In the alternative embodiment of the utility model, the input terminal of the voltage transmitter and the capacitive divider connect It connects, the output end of the voltage transmitter is connect with the amplification module；

The voltage transmitter is used to convert output signal for input signal decompression.

In the alternative embodiment of the utility model, the voltage transmitter includes first voltage mutual inductor, rectifier；

The main sideline circle of the first voltage mutual inductor is connect with the capacitive divider；The first voltage mutual inductor Secondary coil is connect with the rectifier, and the rectifier is connect with the amplification module.

In the alternative embodiment of the utility model, the amplification module includes that voltage detector, first switch, signal are put Big device；

The voltage detector, first switch, signal amplifier are sequentially connected；

The voltage detector is used to detect the voltage value of the voltage transmitter output；

The first switch is for connecting the signal amplifier；

The signal amplifier is for amplifying voltage signal.

In the alternative embodiment of the utility model, the sampling A/D chip be ADS1210, ADS1211, AD7689, Any one in AD7656, TL2543.

In the alternative embodiment of the utility model, the multiple frequence control unit includes controller and signal conditioner, The controller is coupled with the signal conditioner；

The controller is used to receive the feedback signal that the sampling feedback unit is sent, and sends out to the signal conditioner Send AC signal；

Signal after change and is sent to institute for changing the voltage swing of the AC signal by the signal conditioner State product to be tested.

In the alternative embodiment of the utility model, the output end of the signal conditioner is equipped with filter, the filtering Device is used to be filtered to by the signal of the signal conditioner.

The utility model embodiment additionally provides a kind of multiple frequence control cabinet, including cabinet, and the box house is equipped with and opens Powered-down source, display screen and above-mentioned multiple frequence control device；

The input terminal of the multiple frequence control device is connect with the input terminal of the Switching Power Supply；

The output end of the multiple frequence control device is connect with the first signal input part of the display screen, the multiple frequence The output end of control device is used for external product to be tested；

The output end of the Switching Power Supply is connect with the energization input of the display screen；

The display screen is used to show the output signal of the multiple frequence control device.

Compared with the prior art, the utility model has the following beneficial effects: a kind of multiple frequence control provided by the utility model Device and multiple frequence control cabinet processed provides a variety of stimulus by multiple frequence control unit, can be with according to a variety of stimulus Quality test is carried out to product to be tested, the test voltage to insulate between the winding to improve product to be tested further reaches pressure test mesh 's.After product to be tested is boosted input signal, the output signal of product to be tested can be acquired by sampling feedback unit, and is fed back To the multiple frequence control unit, closed-loop system is formed, avoiding the product to be tested voltage caused by open cycle system can not be true The correctness of pressure test test can be improved with this for fixed test drawback.

To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and Cooperate appended attached drawing, is described in detail below.

Detailed description of the invention

It, below will be to required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment The attached drawing used is briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore not It should be considered as the restriction to range, for those of ordinary skill in the art, without creative efforts, It can also be obtained according to these attached drawings other relevant attached drawings.

Fig. 1 shows the schematic diagram of multiple frequence control device provided by the utility model embodiment and product to be tested cooperation.

Fig. 2 shows the partial schematic diagrams of sampling feedback unit provided by the utility model embodiment.

Fig. 3 shows the schematic diagram of amplification module provided by the utility model embodiment.

Fig. 4 shows the schematic diagram of multiple frequence control unit provided by the utility model embodiment.

Fig. 5 shows the schematic diagram of multiple frequence control cabinet provided by the utility model embodiment.

Icon: 1- multiple frequence control cabinet；10- multiple frequence control device；110- multiple frequence control unit；111- controller； 112- signal conditioner；113- filter；120- sampling feedback unit；121- capacitive divider；A- HV Terminal；B- intermediate voltage terminal Son；C- low-voltage terminal；122- voltage transmitter；123- first voltage mutual inductor；124- rectifier；125- amplification module；1251- Voltage detector；1252- first switch；1253- signal amplifier；126- sampling A/D chip；20- Switching Power Supply；30- display screen； 2- product to be tested.

Specific embodiment

Below in conjunction with attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities Apply example.The component of the utility model embodiment being usually described and illustrated herein in the accompanying drawings can be come with a variety of different configurations Arrangement and design.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below The range of claimed invention, but it is merely representative of the selected embodiment of the utility model.Based on the utility model Embodiment, those skilled in the art's every other embodiment obtained without making creative work, all Belong to the range of the utility model protection.

It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.

In the description of the present invention, it should be noted that term " on ", "lower", "left", "right", "inner", "outside" etc. The orientation or positional relationship of instruction be based on the orientation or positional relationship shown in the drawings or the utility model product use when The orientation or positional relationship usually put, is merely for convenience of describing the present invention and simplifying the description, rather than instruction or dark Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair The limitation of the utility model.

In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set Set ", " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, Or it is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, intermediary can also be passed through It is indirectly connected, can be the connection inside two elements.

It is in the description of the present invention, it should also be noted that, herein, such as first and second or the like pass It is that term is only used to distinguish one entity or operation from another entity or operation, and not necessarily requires or secretly Show that there are any actual relationship or orders between these entities or operation.The terms "include", "comprise" or its What his variant is intended to non-exclusive inclusion, so that including the process, methods of a series of elements, article or setting Standby includes not only those elements, but also including other elements that are not explicitly listed, or further includes for this process, side Method, article or the intrinsic element of equipment.In the absence of more restrictions, limited by sentence "including a ..." Element, it is not excluded that there is also other identical elements in the process, method, article or apparatus that includes the element.It is right For those skilled in the art, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.

With reference to the accompanying drawing, it elaborates to some embodiments of the utility model.In the absence of conflict, under The feature in embodiment and embodiment stated can be combined with each other.

A kind of multiple frequence control device 10 is present embodiments provided, the multiple frequence control device 10 can be used for carrying out PT The voltage-withstand test of (Potential transformer, voltage transformer) or the voltage-withstand test of other main transformer inductors.

In the present embodiment, referring to Fig. 1, the multiple frequence control device 10 includes multiple frequence control unit 110, samples instead Present unit 120.

The multiple frequence control unit 110 includes for accessing the first input end of ac supply signal, for receiving State the second input terminal of the feedback signal of sampling feedback unit 120 and the output end for exporting multi-frequency signal.

The output end of the multiple frequence control unit 110 is used for external product to be tested 2.

The input terminal of the sampling feedback unit 120 is used for the external product to be tested 2.

The output end of the sampling feedback unit 120 is connect with the second input terminal of the multiple frequence control unit 110.

The product to be tested 2 can be voltage transformer to be measured, be also possible to transformer to be measured, can also be that other are to be measured Inductor with main transformer inducing function or need test load using variable-frequency power sources.In an application scenarios, institute Stating product to be tested 2 is distribution transformer, and the multiple frequence control device 10 can be used for carrying out inducting-voltage proof to the distribution transformer Test.

The output electricity of the product to be tested 2 can during the test, be acquired by the way that the sampling feedback unit 120 is arranged Pressure, further determines that the pressure voltage of product to be tested 2.When being tested, the multiple frequence control unit 110, the product to be tested 2, institute It states sampling feedback unit 120 and forms closed-loop system, it can be to avoid the examination that can not determine 2 output voltage of product to be tested due to open cycle system Drawback is tested, test correctness can be improved to a certain extent.It is described according to the feedback signal that sampling feedback unit 120 is fed back The feedback signal can be analyzed inside multiple frequence control unit 110, be further formed feedback profile, so that user obtains Know test result, variable test signal or test mode may further be changed according to the test result.

Wherein, the multiple frequence control unit 110 can access the ac voltage signal of 200V, can also access 220V's Ac voltage signal can also access the ac voltage signal of 380V.Those skilled in the art can choose the multiple frequence control The input supply voltage value of unit 110 processed, the size and access of the input supply voltage value of the multiple frequence control unit 110 The mode of input power should not be construed as a limitation of the present invention.In one embodiment, alternating current conduct can be accessed Input power can access existing power supply device in another embodiment to provide input voltage.

The multiple frequence control unit 110 can export the signal of multi-frequency, and the frequency range of output can be 20- 600Hz, output accuracy can achieve 0.01Hz, to meet the various demands in eletric power induction pressure test.For example, output signal Frequency can be 20Hz, be also possible to 30Hz, can also be 200Hz, can also be 300Hz, can also be 600Hz.Ability The output frequency of the multiple frequence control unit 110 can be arbitrarily arranged in field technique personnel according to actual needs, it is further provided The test signal of product to be tested 2.

The multiple frequence control unit 110 can export multiple voltage signal, and the voltage range of output can be 50V- 400V is also possible to 200V for example, the voltage magnitude of output signal can be 50V, can also be 400V.Those skilled in the art The output voltage of the multiple frequence control unit 110 can be arbitrarily arranged in member according to actual needs, it is further provided described to be measured The test signal of product 2.

In an example, the signal frequency that the multiple frequence control unit 110 exports is 250Hz, and voltage magnitude is 280V, current value 25A.In one embodiment, frequency, the amplitude of output signal can be arbitrarily set by key；? In another embodiment, frequency, the amplitude of output signal can be arbitrarily adjusted by knob.

In the present embodiment, as shown in Fig. 2, the sampling feedback unit 120 includes capacitive divider 121, voltage transmission Device 122, amplification module 125, sampling A/D chip 126." D " in Fig. 2 is for connecting multiple frequence control unit 110.

The input terminal of the capacitive divider 121 is connect with the product to be tested 2, the output end of the capacitive divider 121 It is connect with the input terminal of the voltage transmitter 122, the voltage transmitter 122 is connect with the amplification module 125, described to put Big module 125 is connect with the sampling A/D chip 126, and the sampling A/D chip 126 is connect with the multiple frequence control unit 110.

The capacitive divider 121, the voltage signal exported for acquiring the product to be tested 2, and believed according to the voltage Number to the voltage transmitter 122 provide voltage division signal.

The voltage transmitter 122, for exporting direct current signal.

The sampling A/D chip 126 converts analog signals into digital signal for carrying out data sampling.

The compressive resistance of capacitive divider 121 is big, is not easy to puncture, can with reactor generate resonance with to product to be tested 2 into The test of horizontal high voltage ac voltage withstanding.Test safety can be improved by the way that the capacitive divider 121 is arranged, the voltage is set and is become It send device 122, the amplification module 125 to be conducive to the sampling A/D chip 126 and carries out subsequent data sampling movement, the sampling core Piece 126 can convert collected analog signal to the digital signal that the multiple frequence control unit 110 can identify, favorably In to collected data progress subsequent processing and analysis.

In the present embodiment, the capacitive divider 121 includes HV Terminal A, the sub- B of intermediate voltage terminal, low-voltage terminal C.It is described HV Terminal A is used for the external product to be tested 2, and medium pressure terminal B is connect with the voltage transmitter 122, the low-pressure end Sub- C ground connection.

In one embodiment, the capacitive divider 121 can be packaged collection voltage divider, the collection ingredient There are multiple connecting terminals on depressor to connect the product to be tested 2, the voltage transmitter 122 and the earth.

In another embodiment, the capacitive divider 121 can be split type point of multiple measurement capacitor compositions Depressor, it is multiple it is described measurement capacitors between tie points can be used for connect the product to be tested 2, the voltage transmitter 122 with And the earth.

In other embodiments, the capacitive divider 121 can be replaced using RC divider, RC divider can To resist extra-high surge voltage, surge voltage may further be measured.

Wherein, the capacitor body of the capacitive divider 121 can be connected by the even hundreds of capacitors of dozens of It forms.

In an example, the output voltage of the product to be tested 2 can be tens kilovolts or several hundred kilovolts.For example, institute The output voltage for stating product to be tested 2 can be 150KV, and the voltage for directly acquiring the product to be tested 2 can be burnt to be connected with the product to be tested 2 The equipment connect, the capacitive divider 121, which is arranged, can be convenient the output voltage for acquiring the product to be tested 2, improve the sampling The service life of feedback unit 120 reduces due to direct collection voltages bring security risk, reduces due to 2 voltage of product to be tested Other equipment bring is impacted in variation.

The capacitive divider 121 can also monitor the high pressure of the inducting-voltage proof of the product to be tested 2 in real time, avoid The problem of appearance rises capacitor, no-load voltage ratio mistake causes.

In the present embodiment, the input terminal of the voltage transmitter 122 is connect with the capacitive divider 121, the electricity The output end of pressure transmitter 122 is connect with the amplification module 125.

The voltage transmitter 122 is used to convert output signal for input signal decompression.The voltage transmitter 122 was both The conversion of AC signal to direct current signal may be implemented, can also realize antihypertensive effect.AC signal is converted into direct current signal It can be in order to acquire the analog-to-digital conversion of information, if being always AC signal, it may be difficult to directly acquire the voltage of output signal, shadow Ring the accuracy of data acquisition.By the signal of input carry out decompression can be burnt to avoid excessively high voltage amplification module 125 or Acquisition chip may further improve the safety of measurement process.

In one embodiment, the voltage transmitter 122 can be the integrated transmitter of integral type, the integrated change It send device to be equipped with multiple input ports and multiple output ports, can be acquired by multiple input ports and multiple output ports more The data of a product to be tested 2, further increase test efficiency.It can be realized simultaneously AC signal by the integrated transmitter Conversion and antihypertensive effect with direct current signal.

In another embodiment, the voltage transmitter 122 can also be the split type voltage that discrete device is constituted Transmitter 122, the Split type electric pressure transmitter 122 include first voltage mutual inductor 123, rectifier 124；

The main sideline circle of the first voltage mutual inductor 123 is connect with the capacitive divider 121；The first voltage is mutual The secondary coil of sensor 123 is connect with the rectifier 124, and the rectifier 124 is connect with the amplification module 125.Pass through Buck functionality may be implemented in the first voltage mutual inductor 123, can be converted AC signal to directly by the rectifier 124 Flow signal.

Before the signal for acquiring the capacitive divider 121 accesses the voltage transmitter 122, height can also be set Accuracy voltage mutual inductor is adjusted, and in an example, the no-load voltage ratio of the high-precision voltage transformer can be set to 1000: 1, when the high-precision voltage transformer collects the AC signal of 30KV, the AC signal of 30V is exported, then by the 30V's AC signal is sent into the voltage transmitter 122.The voltage transmitter 122 converts 10V's for the AC signal of the 30V Direct current signal, the direct current signal of the 10V can be passed to the amplification module 125.

Wherein, the voltage transmitter 122 can also export other direct current signals, such as can believe the voltage of the 30V The signal of the 3V or 20mV is sent into the amplification module 125 again by the signal for number being converted into 3V perhaps 20mV.

In the present embodiment, as shown in figure 3, the amplification module 125 includes voltage detector 1251, first switch 1252, signal amplifier 1253.The voltage detector 1251, first switch 1252, signal amplifier 1253 are sequentially connected.

The voltage detector 1251 is used to detect the voltage value that the voltage transmitter 122 exports, the first switch 1252 for connecting the signal amplifier 1253, and the signal amplifier 1253 is for amplifying voltage signal.

Wherein, the voltage detector 1251 can be the voltage detecting circuit of discrete device composition, for example, by using resistance Or capacitor is divided, and is also possible to integrated voltage checking chip, such as can use ADE7755, can also be have it is aobvious The voltmeter for showing function, for example, by using alternating current-direct current high pressure gauge.

In one embodiment, the voltage detector 1251 can have multiple output ends.The voltage detector 1251 can be according to preset voltage range or preset reference voltage, to the electricity received from the voltage transmitter 122 It presses signal to divide voltage class, different trigger signals is exported with trigger output end.The trigger signal is for making described first Switch 1252 is closed, and the first switch 1252 can drive the signal amplifier 1253 to amplify after being closed.

Wherein, the first switch 1252 can be multiple switch pipe, is also possible to relay, can also be with multiple The single pole multiple throw of gear can also be the combination of switching tube, relay, single pole multiple throw.In one embodiment, The first switch 1252 is multiple switch pipe, and different switching tubes, which is combined, can be connected to different signal amplifiers 1253, different signal amplifiers 1253 can correspond to different amplification factors.The set-up mode of the first switch 1252 with And setting quantity should not be construed as a limitation of the present invention.

The signal amplifier 1253 can be instrument amplifier, for example, can be AD620, AD621, AD622, AD623, At least one of AD624, INA128, INA129, INA333.In an example, the signal amplifier 1253 is AD620.Common mode interference can be reduced using instrument amplifier, can be realized accurate, accurate amplification.Those skilled in the art can be with Select the model of the signal amplifier 1253 according to actual needs to meet the needs of signal amplification.

In an example, when the voltage detector 1251 receives 10V voltage, pass through the first switch 1252 It is connected to the voltage amplification that the signal amplifier 1253 carries out 1:1；When the voltage detector 1251 receives the voltage of 50mV When, the voltage amplification that another signal amplifier 1253 carries out 1:20 is switched to by the first switch 1252.

The direct current signal that the signal transmitting device exports selectivity can be carried out by the signal amplifier 1253 to put Greatly, so that amplified signal can be acquired by the sampling A/D chip 126.

Wherein.The ratio of voltage signal should be recorded each time, can provide foundation with this for follow-up data processing.? Under a kind of embodiment, the data recorded and the data detected can carry out pair with the data by a reference source examined and determine Than, then calibrate for error in such a way that software writes coefficient, data precision can be promoted further with this.

In the present embodiment, the sampling A/D chip 126 is in ADS1210, ADS1211, AD7689, AD7656, TL2543 Any one.Those skilled in the art can select the type of the sampling A/D chip 126 according to actual needs, so that described adopt Sample chip 126 meets sample requirement.

In an example, the sampling A/D chip 126 is ADS1210, and ADS1210 is 24 sampling A/D chips 126, sampling Rate can achieve 16ksps.It may be implemented to sample at full speed by the sampling A/D chip 126, each second samples 16K point, then will adopt Sampling point is sent into the multiple frequence control unit 110 and is analyzed and calculated, anti-with the closed loop that this may be implemented entirely to test process Feedback.

In the present embodiment, as shown in figure 4, the multiple frequence control unit 110 includes controller 111 and signal conditioner 112, the controller 111 is coupled with the signal conditioner 112.

The controller 111 is used to receive the feedback signal that the sampling feedback unit 120 is sent, and to the signal tune It manages device 112 and sends AC signal.

The signal conditioner 112 for changing the AC signal voltage swing, and by after change signal send To the product to be tested 2.

Wherein, the multiple frequence control unit 110 can utilize FFT according to the sampled data of the sampling A/D chip 126 (Fast Fourier Transformation, Fast Fourier Transform (FFT)) algorithm quickly calculate and analyze.The controller 111 include FPGA (Field-Programmable Gate Array, field programmable gate array) and DSP (digital Signal processor, digital signal processor), on the one hand the sampling A/D chip 126 can be acquired by FPGA and DSP Data analyzed, calculated, integrated.Wherein it is possible to an external display module to by calculating, the obtained signal of analysis into Row display, so that user can intuitively obtain data result, can show specific value on the display module, can also show Trend curve.The display module can provide interactive interface, Yong Huke between the multiple frequence control device 10 and user With by the display module input control parameter, so that the multiple frequence control unit 110 is exported according to the control parameter Signal specific.

The controller 111 can (Direct Digital Synthesizer, Direct Digital frequency be closed by DDS Grow up to be a useful person) realize the synthesis of any specific frequency signal, the specific frequency can be intended to the frequency tested the product to be tested 2 Rate.The specific frequency can be set by FPGA.FPGA can also be connected with the signal conditioner 112, to control It states signal conditioner 112 and carries out rate-adaptive pacemaker.In one embodiment, SPI ((Serial Peripheral can be passed through Interface, Serial Peripheral Interface (SPI)) communication mode and FPGA communicated, to realize the setpoint frequency and the output that receive FPGA The setpoint frequency.

By DDS technology, the frequency of 50Hz, 100Hz, 150Hz, 200Hz, 400Hz, 600Hz can be exported.

Wherein, the signal conditioner 112 can carry out signal condition and conversion, the output essence of AD9832 using AD9832 Degree can be 0.005821Hz.In one embodiment, AD9832 can make the voltage of signal tend towards stability, output signal Frequency resolution can achieve 0.01Hz, can satisfy test demand.

In the present embodiment, as shown in figure 4, the output end of the signal conditioner 112 is equipped with filter 113, the filter Wave device 113 is used to be filtered to by the signal of the signal conditioner 112.The output end of the filter 113 is for connecting Connect the product to be tested 2.

By the way that the filter 113 is arranged the output signal of the multiple frequence control unit 110 can be improved with filtering clutter Confidence level.

The multiple frequence control device 10 provided through this embodiment, when carrying out pressure test, multiple frequence control unit 110, closed-loop control is realized between product to be tested 2, sampling feedback unit 120, the multiple frequence control unit 110 can be with output frequency Precision is the frequency signal of 0.01Hz, and the product to be tested 2 is carried out according to the frequency signal that the multiple frequence control unit 110 exports Induced over voltage withstand test, the sampling feedback unit 120 can carry out the inductive voltage value of the product to be tested 2 superfast high-precision Degree sampling, and sampled result is fed back into the multiple frequence control unit 110, it is tried so that user changes according to the sampled result Parameter is tested, test is re-started, constantly tests the quality of the product to be tested 2.During the whole test process, closed loop control logic energy Enough real time monitorings realized to the inducting-voltage proof value of product to be tested 2, the case where according to back production voltage, the multiple frequence control unit 110 internal controllers 111 and signal conditioner 112 are automatically boosted, and user is i.e. reachable without paying close attention to specific boost process To setting voltage and setpoint frequency is made, in boosting link, closer to the setting voltage, the rate of rise is more steady, so as to adopt The sample retention time is longer, avoids the tripping problems due to caused by signal fluctuation.

In entire test, during the high pressure that product to be tested 2 generates is kept, the controller 111 can be to described more times The voltage that frequency control unit 110 exports is finely adjusted, and reduces the high pressure fluctuations in entire induced over voltage withstand test.

The utility model embodiment additionally provides a kind of multiple frequence control cabinet 1, including cabinet (not shown), as shown in figure 5, The box house is equipped with Switching Power Supply 20, display screen 30 and above-mentioned multiple frequence control device 10.

The input terminal of the multiple frequence control device 10 is connect with the input terminal of the Switching Power Supply 20.The Switching Power Supply 20 to the display screen 30 for powering.

The output end of the multiple frequence control device 10 is connect with the first signal input part of the display screen 30, described more The output end of times audio-frequency control device 10 is used for external product to be tested 2.

The output end of the Switching Power Supply 20 is connect with the energization input of the display screen 30.

The display screen 30 is used to show the output signal of the multiple frequence control device 10.

Wherein, in the multiple frequence control device 10, the output end of multiple frequence control unit 110 and the display screen 30 First input end connection, the feedback input end of multiple frequence control unit 110 are connect with the second input terminal of the display screen 30.Institute Stating multiple frequence control unit 110 can be interacted by ModBus bus and the display screen 30.

The display screen 30 provides an interactive interface, the display between the multiple frequence control cabinet 1 and user Screen 30 can show the information of the output signal of the multiple frequence control device 10 to user, can also adopt to described in user's displaying The sampled result that sample feedback unit 120 is fed back.The sampled result can be by inside the multiple frequence control unit 110 into Result after row analysis, integration.

In an example, the display screen 30 can show the information such as voltage data, display scale, voltage curve, use The information that family can be shown according to the display screen 30 changes the test parameters tested the product to be tested 2, further mentions High test accuracy.The boost instruction of user's triggering and the target voltage of setting are received when the multiple frequence control device 10 When, ceaselessly the high tension voltage of the product to be tested 2 output is sampled, while the multiple frequence control device 10 will collect Feedback voltage data feedback to user, so that user is observed whether feedback voltage data reach target voltage, in not up to mesh When marking voltage, the output end of the multiple frequence control unit 110 is boosted with the speed of target voltage 5%；Collecting State feedback voltage data reach target voltage 80% after, the rate of rise is switched to the 1% of target voltage；It is fed back when observing When voltage data reaches the 98% of target voltage, 0.1% that the rate of rise is switched to target voltage is slowly boosted, with this Boosting mode both considers the rate of rise, can also accomplish steadily to boost, and reaches target voltage with the faster rate of rise, has Effect is alleviated due to the too fast bring overshooting problem of the rate of rise.

Multiple frequence chamber provided by the utility model provides a variety of stimulus, root by multiple frequence control unit 110 Can be to the progress quality test of product to be tested 2 according to a variety of stimulus, the test voltage to insulate between the winding to improve product to be tested 2, Further reach pressure test purpose.After product to be tested 2 is boosted input signal, it can be adopted by sampling feedback unit 120 Collect the output signal of product to be tested 2, and feed back to the multiple frequence control unit 110, forms closed-loop system, avoid due to open loop The correctness of pressure test test can be improved with this for the test drawback that 2 voltage of product to be tested can not determine caused by system.Its In, the feedback is tied when receiving the feedback result of the sampling feedback unit 120 in the multiple frequence control unit 110 Fruit shows on the display screen 30, allows the user to intuitively obtain the feedback result.

The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of multiple frequence control device, which is characterized in that including multiple frequence control unit, sampling feedback unit；

The multiple frequence control unit includes for accessing the first input end of ac supply signal, for receiving the sampling instead Present the second input terminal of the feedback signal of unit and the output end for exporting multi-frequency signal；

The output end of the multiple frequence control unit is used for external product to be tested；

The input terminal of the sampling feedback unit is used for the external product to be tested；

The output end of the sampling feedback unit is connect with the second input terminal of the multiple frequence control unit.

2. multiple frequence control device as described in claim 1, which is characterized in that the sampling feedback unit includes capacitance partial pressure Device, voltage transmitter, amplification module, sampling A/D chip；

The input terminal of the capacitive divider is connect with the product to be tested, and the output end of the capacitive divider and the voltage become The input terminal of device is sent to connect, the voltage transmitter is connect with the amplification module, the amplification module and the sampling A/D chip Connection, the sampling A/D chip are connect with the multiple frequence control unit；

The capacitive divider, for acquiring the voltage signal of product to be tested output, and according to the voltage signal to described Voltage transmitter provides voltage division signal；

The voltage transmitter, for exporting direct current signal；

The sampling A/D chip converts analog signals into digital signal for carrying out data sampling.

3. multiple frequence control device as claimed in claim 2, which is characterized in that the capacitive divider include HV Terminal, Intermediate voltage terminal, low-voltage terminal；

The HV Terminal is used for the external product to be tested；

Medium pressure terminal is connect with the voltage transmitter；

The low-voltage terminal ground connection.

4. multiple frequence control device as claimed in claim 3, which is characterized in that the input terminal of the voltage transmitter with it is described Capacitive divider connection, the output end of the voltage transmitter are connect with the amplification module；

The voltage transmitter is used to convert output signal for input signal decompression.

5. multiple frequence control device as claimed in claim 3, which is characterized in that the voltage transmitter includes that first voltage is mutual Sensor, rectifier；

The main sideline circle of the first voltage mutual inductor is connect with the capacitive divider；The secondary side of the first voltage mutual inductor Coil is connect with the rectifier, and the rectifier is connect with the amplification module.

6. multiple frequence control device as claimed in claim 3, which is characterized in that the amplification module include voltage detector, First switch, signal amplifier；

The voltage detector, first switch, signal amplifier are sequentially connected；

The voltage detector is used to detect the voltage value of the voltage transmitter output；

The first switch is for connecting the signal amplifier；

The signal amplifier is for amplifying voltage signal.

7. multiple frequence control device as claimed in claim 3, which is characterized in that the sampling A/D chip be ADS1210, Any one in ADS1211, AD7689, AD7656, TL2543.

8. multiple frequence control device as described in claim 1, which is characterized in that the multiple frequence control unit includes controller And signal conditioner, the controller are coupled with the signal conditioner；

The controller is used to receive the feedback signal that the sampling feedback unit is sent, and sends and hand over to the signal conditioner Flow signal；

The signal conditioner for changing the AC signal voltage swing, and by the signal after change be sent to it is described to Survey product.

9. multiple frequence control device as claimed in claim 8, which is characterized in that the output end of the signal conditioner is equipped with filter Wave device, the filter are used to be filtered to by the signal of the signal conditioner.

10. a kind of multiple frequence control cabinet, which is characterized in that including cabinet, the box house be equipped with Switching Power Supply, display screen with And the described in any item multiple frequence control devices of claim 1-9；

The input terminal of the multiple frequence control device is connect with the input terminal of the Switching Power Supply；

The output end of the multiple frequence control device is connect with the first signal input part of the display screen, the multiple frequence control The output end of device is used for external product to be tested；

The output end of the Switching Power Supply is connect with the energization input of the display screen；

The display screen is used to show the output signal of the multiple frequence control device.