CN104535955A - Calibration device and method of transformer frequency response method winding deformation tester - Google Patents
Calibration device and method of transformer frequency response method winding deformation tester Download PDFInfo
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Abstract
The invention discloses a calibration device of a transformer frequency response method winding deformation tester and a measuring method thereof. The calibration device comprises an external signal input end receiving an external input signal, an internal program control signal generator producing an internal program control signal, a program control attenuator for attenuating the signals, an exciting signal output end outputting a signal to the exciting end of the winding deformation tester, a response signal output end outputting a signal to the output end of the winding deformation tester, a program control acquirer acquiring the external input signal, or the internal program control signal or the attenuated signal, and a central processing unit for processing signal data acquired by the program control acquirer. The calibration device is used for measuring and calibrating the transformer frequency response method winding deformation tester and ensuring the accuracy of the winding deformation frequency response tester and has important significance on safety operation of a transformer.
Description
Technical field
The present invention relates to transformer testing device technique field, particularly, relate to a kind of calibrating installation and calibration method thereof of transformer method of frequency response method winding deformation tester.
Background technology
Transformer is the nucleus equipment of electrical network, winding deformation is one of modal internal fault of power transformer, actively develop deformation of transformer winding diagnostic work, Timeliness coverage has the transformer of winding deformation, and in a planned way the person of carrying out covers inspection and maintenance, not only can save a large amount of human and material resources, and to preventing the generation of Accident of Transformer from also having and important effect.At present, deformation of transformer winding diagnostic work is all being actively developed in countries in the world, and State Grid Corporation of China 2011 editions 18 is counter to be arranged preventing the short circuit of transformer near region and winding deformation to be placed on very important position.At present, the method for test winding deformation conventional both at home and abroad has frequency response analysis and short circuit impedance method, and wherein frequency response analysis is China's the most frequently used, the most effective one of means detecting winding deformation at present.
In order to the winding deformation of Measurement accuracy transformer, the precision of winding deformation frequency sound test instrument self first to be guaranteed.The producer producing winding deformation frequency sound test device at present is both at home and abroad a lot, there is different examination criterias, cause data between different device to compare between different producers; Even if same device is along with the change of time, the amplitude versus frequency characte of himself also can change, and the basis causing response curve comparison before and after same device also can deterioration; So the amplitude versus frequency characte controlling frequency sound test instrument ensures that method of frequency response method detects the necessary means of winding deformation accuracy; This just needs the amplitude versus frequency characte being investigated, demarcated it by the winding deformation frequency sound test instrument verification system of a set of specialty.Current electric system winding deformation frequency sound test instrument is popularized, and each electric company is substantially all configured with winding deformation frequency sound test instrument, but present stage not yet has relevant mechanism accurately to examine and determine winding deformation tester.
Summary of the invention
Object of the present invention is just the shortcoming and defect overcoming above-mentioned prior art, provides a kind of calibrating installation of transformer method of frequency response method winding deformation tester, to ensure the precision of winding deformation frequency sound test instrument self, present invention also offers its calibration method.
The present invention's adopted technical scheme that solves the problem is:
The calibrating installation of transformer method of frequency response method winding deformation tester, comprising:
External signal input terminals, for connecting the signal end of winding deformation tester, receives external input signal;
Inner programmable signal generator, for generation of inner program control signal;
Programmable attenuator, the inside program control signal produced for the external input signal that receives external signal input terminals or inner programmable signal generator is decayed;
Pumping signal output terminal, for connecting the excitation end of winding deformation tester, exports the external input signal of the signal after programmable attenuator decay or external signal input terminals reception or the inside program control signal of inner programmable signal generator generation;
Response signal output terminal, for connecting the responder of winding deformation tester, exports the external input signal of the signal after programmable attenuator decay or external signal input terminals reception or the inside program control signal of inner programmable signal generator generation;
Program control collector, for gather programmable attenuator decay after signal or external signal input terminals receive external input signal or inner programmable signal generator produce inside program control signal;
CPU (central processing unit), for the treatment of the signal data that program control collector gathers, and controls inner programmable signal generator, programmable attenuator, program control collector.
As a further improvement on the present invention, described programmable attenuator connects external signal input terminals and inner programmable signal generator by a program control selector switch, for selecting external input signal or the inner program control signal input signal as programmable attenuator; Described pumping signal output terminal, response signal output terminal, program control collector all respectively connect external signal input terminals, inner programmable signal generator, programmable attenuator by a program control selector switch simultaneously, for carrying out the selection of external input signal, inner program control signal and attenuator output signal.
Further, the calibrating installation of above-mentioned transformer method of frequency response method winding deformation tester also comprises equally accurate frequency tester, these Precision Measuring Frequency devices connect external signal input terminals and inner programmable signal generator by a program control selector switch, for selecting external input signal or the inner program control signal input signal as equally accurate frequency tester.
Further, association's processing unit that described CPU (central processing unit) comprises central processing unit and is connected with central processing unit, described inner programmable signal generator, programmable attenuator, program control collector, program control selector switch, equally accurate frequency tester are all connected with assisting processing unit.
Further, described central processing unit is also connected with display, keyboard, USB access unit, network insertion unit.
Further, described programmable attenuator is made up of seven grades of attenuator cascades of 1dB, 2 dB, 4 dB, 8 dB, 16dB, 32dB, 37 dB, and every grade of attenuator is also parallel with the attenuation units of a 0dB by a selector switch.
Further, described inner programmable signal generator comprises the DDS generator, Hi-pass filter, low-pass filter and the amplifier that are connected successively, and described DDS generator is also connected with 16 the DA conversion equipments controlling its reference current.
Further, described program control collector comprises the impedance transformation unit, programme-controlled gain unit, AD conversion unit, data acquisition unit, the data outputting unit that are connected successively, wherein:
Impedance transformation unit, exporting for realizing high resistant input low-resistance, reducing programme-controlled gain unit to the impact of front end input signal;
Programme-controlled gain unit, for amplifying impedance transformation element output signal;
AD conversion unit, is converted to digital signal for the simulating signal exported by programme-controlled gain unit;
Data acquisition unit, stores for the digital signal exported AD conversion unit;
Data outputting unit, the image data for being stored by data acquisition unit is transferred to CPU (central processing unit) and processes.
The measuring method of the calibrating installation of transformer method of frequency response method winding deformation tester, comprise the detection of frequency-selective filtering frequency bandwidth, signal attenuation value accuracy detection and signal frequency to detect, during detection, the external signal input terminals of calibrating installation is connected the signal end of winding deformation tester, the excitation end of pumping signal output terminal connection winding deformation tester, the responder of response signal output terminal connection winding deformation tester;
Described signal attenuation value accuracy detection comprises the following steps:
The pad value of S11, setting programmable attenuator;
S12, external signal input terminals receive the signal of the signal end of winding deformation tester, and the signal of reception outputs to programmable attenuator, pumping signal output terminal respectively by two program control selector switchs;
S13, programmable attenuator are decayed to signal, and the signal after decay exports to response signal output terminal by a program control selector switch;
Signal after decay is exported to the responder of winding deformation tester by S14, response signal output terminal;
Signal is exported to the excitation end of winding deformation tester by S15, pumping signal output terminal;
S16, the excitation end signal output terminal of winding deformation tester sweep measurement calibrating installation and the output signal of responder signal output part, and calculate pad value;
The maximum deviation of the pad value preset in the pad value that in S17, calculation procedure S16, winding deformation tester sweep measurement goes out and step S11;
Described frequency-selective filtering frequency bandwidth detects and comprises the following steps:
The centre frequency F of S21, the setting pad value D of programmable attenuator and the frequency-selective filtering of winding deformation tester;
The signal end of S22, winding deformation tester exports the sine wave signal of fixed frequency F;
S23, external signal input terminals receive the sine wave signal of winding deformation tester output and by a program control selector switch, this sine wave signal are outputted to programmable data collector;
This sine wave signal is outputted to CPU (central processing unit) by S24, programmable data collector, and CPU (central processing unit) calculates the amplitude A of this sine wave signal;
S25, inner programmable signal generator produce for frequency the sine wave signal that amplitude size is A with filtering upper limiting frequency and filtering lower frequency limit respectively, carry out filtering upper limit bandwidth detection and filtering lower limit bandwidth detection;
Described signal frequency detects and comprises the following steps:
S31, be E by the frequency setting of calibrating installation;
S32, winding deformation tester output frequency are the signal of E;
The external signal input terminals of S33, calibrating installation receives the signal of winding deformation tester output and by a program control selector switch, this signal is outputted to equally accurate frequency tester;
S34, equally accurate frequency tester measure current demand signal frequency E1;
S35, CPU (central processing unit) calculate the maximum deviation of the frequency E that calibrating installation presets in E1 and step S31.
Further, step S25 is further comprising the steps:
S251, described filtering lower frequency limit get 0.975*F, and inner programmable signal generator generation amplitude size is A, frequency is the sine wave signal of 0.975*F, and by a program control selector switch, this signal is exported to programmable attenuator;
S252, programmable attenuator are decayed to signal, and the signal after decay exports to winding deformation tester by response signal output terminal and coupled program control selector switch;
S253, winding deformation tester measure the pad value D1 of the signal after decay;
S254, CPU (central processing unit) calculate the maximum deviation of the pad value D set in D1 and step S21;
S255, described filtering upper limiting frequency get 1.025*F, and it is A that inner programmable signal generator produces amplitude size, and frequency is the sine wave letter of 1.025*F, and by a program control selector switch, this signal is exported to programmable attenuator;
S256, programmable attenuator are decayed to signal, and the signal after decay exports to winding deformation tester by response signal output terminal and coupled program control selector switch;
S257, winding deformation tester measure the pad value D2 of the signal after decay;
S258, CPU (central processing unit) calculate the maximum deviation of the pad value D set in D2 and step S21.
To sum up, the invention has the beneficial effects as follows:
1, the calibrating installation of transformer method of frequency response method winding deformation tester of the present invention is used for measuring and calibrating transformer method of frequency response method winding deformation tester, ensures winding deformation frequency sound test instrument precision, to ensureing that the safe operation of transformer is significant;
2, calibrating installation of the present invention adopts programmable attenuator technology, and realized the detection of dynamic of wide region by the program control cascade system of high-speed, high precision operational amplifier, precision is high, sensing range-100dB ~ 20dB, and resolution is up to 1 dB;
3, calibrating installation of the present invention adopts inner program control technology, utilizes high precision DDS generator, realizes the frequency-selective filtering bandwidth measurement to deformation of transformer winding tester;
4, the present invention realizes the high precision frequency detecting of the 500Hz-2MHz of transformer method of frequency response method winding deformation tester by the equally accurate Technology of Frequency Measurement by Using of the 100MHz temperature compensating crystal oscillator of high-precision and high-stability;
5, calibrating installation of the present invention adopts display screen, and can external access of mouse, easy to operate, succinct; Be connected with computing machine with WIFI by USB, Ethernet, be convenient on line operation and data sharing, printing.
Accompanying drawing explanation
Fig. 1 is a kind of embodiment schematic diagram of calibrating installation of the present invention;
Fig. 2 is a kind of embodiment schematic diagram of programmable attenuator;
Fig. 3 is a kind of embodiment schematic diagram of inner programmable signal generator;
Fig. 4 is a kind of embodiment schematic diagram of program control collector.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, the calibrating installation of transformer method of frequency response method winding deformation tester, comprising:
External signal input terminals, for connecting the signal end of winding deformation tester, receives external input signal;
Inner programmable signal generator, for generation of inner program control signal;
Programmable attenuator, the inside program control signal produced for the external input signal that receives external signal input terminals or inner programmable signal generator is decayed;
Pumping signal output terminal, for connecting the excitation end of winding deformation tester, exports the external input signal of the signal after programmable attenuator decay or external signal input terminals reception or the inside program control signal of inner programmable signal generator generation;
Response signal output terminal, for connecting the responder of winding deformation tester, exports the external input signal of the signal after programmable attenuator decay or external signal input terminals reception or the inside program control signal of inner programmable signal generator generation;
Program control collector, for gather programmable attenuator decay after signal or external signal input terminals receive external input signal or inner programmable signal generator produce inside program control signal;
CPU (central processing unit), for the treatment of the signal data that program control collector gathers, and controls inner programmable signal generator, programmable attenuator, program control collector.
Described programmable attenuator connects external signal input terminals and inner programmable signal generator by program control selector switch A, and program control selector switch A is for selecting external input signal or the inner program control signal input signal as programmable attenuator; Described pumping signal output terminal, response signal output terminal, program control collector connect external signal input terminals, inner programmable signal generator, programmable attenuator respectively by program control selector switch B, C, D simultaneously, and program control selector switch B, C, D are for carrying out the selection of external input signal, inner program control signal and attenuator output signal.
Association's processing unit that described CPU (central processing unit) comprises central processing unit and is connected with central processing unit, described inner programmable signal generator, programmable attenuator, program control collector, program control selector switch A, B, C, D are all connected with assisting processing unit.
Described central processing unit is also connected with display, keyboard, USB access unit, network insertion unit.
Association's processing unit in the present embodiment adopts programmable logic cells, for realizing the valid data communication between central processing unit and each program-controlled unit, realizes the data cache of program control collector; And central processing unit adopts high speed embedded microprocessor, a large amount of image data can be processed in real time.
Display adopts high brightness and resolution technical grade liquid crystal display, carries high sensitivity technical grade touch-screen; Keyboard adopts the matrix keyboard of 4x4 touch key; Make the easy to operate, succinct of calibrating installation.
USB access unit comprises 4 USB2.0 Host Controler Interfaces, facilitates user to plug into the USB device such as USB mouse, USB keyboard and USB flash disk; Network insertion unit comprises 1 10/100M Ethernet interface and/or WIFI module, and calibrating installation is connected with computing machine with WIFI by USB, Ethernet, is convenient on line operation and data sharing, printing, also facilitates user to pass through computer long-distance control.
Embodiment 2:
On the basis of embodiment 1, the calibrating installation of the present embodiment also comprises equally accurate frequency tester, these Precision Measuring Frequency devices connect external signal input terminals and inner programmable signal generator by program control selector switch E, and program control selector switch E is for selecting external input signal or the inner program control signal input signal as equally accurate frequency tester.Described program control selector switch E, equally accurate frequency tester are all connected on association's processing unit.Equally accurate frequency tester in the present embodiment select in prior art can realize 500Hz-2MHz optional frequency sine wave shaping filter measurement, input sine wave amplitude range 0.1Vpp-25Vpp, frequency-measurement accuracy 100,000/ frequency tester, realized the high precision frequency detecting of the 500Hz-2MHz of transformer method of frequency response method winding deformation tester by the equally accurate Technology of Frequency Measurement by Using of the 100MHz temperature compensating crystal oscillator of high-precision and high-stability.
Embodiment 3:
On the basis of embodiment 1 or embodiment 2, in the present embodiment, programmable attenuator, inner programmable signal generator, program control collector are further improved:
As shown in Figure 2, described programmable attenuator is made up of seven grades of attenuator cascades of 1dB, 2 dB, 4 dB, 8 dB, 16dB, 32dB, 37 dB, every grade of attenuator is also parallel with the attenuation units of a 0dB by a selector switch, the effect of selector switch is to provide the selection of two kinds of paths, and signal enters every grade of attenuator to be passed through by this attenuator or by the attenuator of 0dB.In the present embodiment, programmable attenuator adopt seven grades of attenuators exponentially cascade system realize, 88 dB that such as will decay equal decay 37dB and add that decay 32dB adds that decay 16dB adds that decay 2dB adds decay 1dB, the 20dB that decays equals decay 16dB and adds decay 4dB, every one-level all have employed the high-accuracy broadband operational amplifier of a slice, effectively overcomes in prior art and adopts the mode of resistance and capacitance partial pressure to carry out the brought temperature that decays to waft and the defect of precision aspect.The programmable attenuator of the present embodiment can realize the step-length (if needed even can be easy to realize the step-length of 0.1dB) of the sinusoidal wave 1dB within the scope of-100dB-0dB of 500Hz-2MHz optional frequency,-50 dB-0dB decay dB value accuracy are better than ± 0.01dB,-80 dB--50dB decay dB value accuracy is better than ± 0.02dB,-100 dB--80dB decay dB value accuracy is better than ± 0.05dB, and in prior art, adopt the mode of resistance and capacitance partial pressure to carry out decaying the general step-length all only achieving 10dB within the scope of-50dB-0dB, and-50 dB-0dB decay, the accuracy of dB value can only reach ± 1dB, sometimes even larger.Therefore the programmable attenuator precision in the present embodiment is higher, and accuracy is larger.
As shown in Figure 3, described inner programmable signal generator comprises the amplifier of DDS generator, Hi-pass filter, low-pass filter and the 20dB be connected successively, and described DDS generator is also connected with 16 the DA conversion equipments controlling its reference current.This inner programmable signal generator can realize the sinewave output of any amplitude of 500Hz-2MHz optional frequency 0-25Vpp, and frequency resolution is better than 0.05Hz, and amplitude resolution is better than 0.5mV.Have benefited from the frequency resolution of this DDS generator up to 1/2E32, amplitude resolution, up to 1/2E16, carries out high-pass filtering and low-pass filtering further reduces the interference of noise to signal by Hi-pass filter, low-pass filter to output signal.
As shown in Figure 4, described program control collector comprises impedance transformation unit connected successively, programme-controlled gain unit, 16 AD conversion unit, data acquisition unit, data outputting unit, impedance transformation unit mainly realizes high resistant input low-resistance and exports, reduce programme-controlled gain unit to the impact of front end input signal, this impedance transformation unit can adopt but be not limited to operational amplifier and realize; Programme-controlled gain unit mainly realizes 1 times, 10 times, 100 times and 1000 times of programming amplifying to impedance transformation element output signal; 16 AD conversion unit mainly realize the conversion to digital signal of the high-precision high-speed simulating signal of programme-controlled gain element output signal; Data acquisition unit mainly realizes the high-speed data processing to the digital signal that 16 AD conversion unit export; The image data that data acquisition unit stores mainly is transferred to association's processing unit and processes by data outputting unit.Program control collector in the present embodiment can adopt another high-speed, high precision DDS generator to provide the collection clock of 16 AD conversion unit, the signals collecting of any sampling rate of 10Kbps-50Mbps can be realized, sampling rate resolution is better than 0.05Hz, be sampled signal amplitude scope-12.5 V-+12.5V, frequency range 500Hz-2MHz, programme-controlled gain 1-1000 are doubly.
Introduce the measuring method of the calibrating installation of transformer method of frequency response method winding deformation tester below, comprise the detection of frequency-selective filtering frequency bandwidth, signal attenuation value accuracy detection and signal frequency to detect, during detection, the external signal input terminals of calibrating installation is connected the signal end of winding deformation tester, the excitation end of pumping signal output terminal connection winding deformation tester, the responder of response signal output terminal connection winding deformation tester; The detection of frequency-selective filtering frequency bandwidth, signal attenuation value accuracy detection and signal frequency detect order in no particular order.
Described signal attenuation value accuracy detection comprises the following steps:
S11, by keyboard or the pad value by the internal processes of calibrating installation setting programmable attenuator, such as-20dB;
S12, external signal input terminals receive the signal of the signal end of winding deformation tester, and the signal of reception is outputted to programmable attenuator by a program control selector switch, outputted to pumping signal output terminal by another program control selector switch;
S13, programmable attenuator are decayed to signal, and the signal after decay exports to response signal output terminal by a program control selector switch;
Signal after decay is exported to the responder of winding deformation tester by S14, response signal output terminal;
Signal is exported to the excitation end of winding deformation tester by S15, pumping signal output terminal, and this step and step S13 and step S14 be order in no particular order;
S16, the excitation end signal output terminal of winding deformation tester sweep measurement calibrating installation and the output signal of responder signal output part, and calculate pad value;
S17, the pad value that winding deformation tester sweep measurement goes out is input to calibrating installation, CPU (central processing unit) calculates the maximum deviation of the pad value preset in the pad value and step S11 that winding deformation tester sweep measurement goes out, and aforementionedly the pad value that winding deformation tester sweep measurement goes out is input to calibrating installation can be inputted by input keyboard.
Described frequency-selective filtering frequency bandwidth detects and comprises the following steps:
S21, such as, by keyboard or the pad value D by the internal processes of calibrating installation setting programmable attenuator, the centre frequency F of the frequency-selective filtering of-20dB and winding deformation tester;
The signal end of S22, winding deformation tester exports the sine wave signal of fixed frequency F;
S23, external signal input terminals receive the sine wave signal of winding deformation tester output and by a program control selector switch, this sine wave signal are outputted to programmable data collector;
This sine wave signal is outputted to CPU (central processing unit) by S24, programmable data collector, and CPU (central processing unit) calculates the amplitude A of this sine wave signal; The amplitude measuring sine wave signal is prior art, repeats no more its concrete methods of realizing in the present invention;
S25, inner programmable signal generator produce for frequency the sine wave signal that amplitude size is A with filtering upper limiting frequency and filtering lower frequency limit respectively, carry out filtering upper limit bandwidth detection and filtering lower limit bandwidth detection; In the present embodiment, filtering lower frequency limit gets 0.975*F, filtering upper limiting frequency gets 1.025*F, filtering upper limit bandwidth detection and filtering lower limit bandwidth detection be order in no particular order, filtering upper limit bandwidth detection comprises following step S255-258, and filtering lower limit bandwidth detection specifically comprises following step 251-step 254:
S251, inner programmable signal generator generation amplitude size is A, frequency is the sine wave signal of 0.975*F, and by a program control selector switch, this signal is exported to programmable attenuator;
S252, programmable attenuator are decayed to signal, and the signal after decay exports to winding deformation tester by response signal output terminal and coupled program control selector switch;
S253, winding deformation tester measure the pad value D1 of the signal after decay;
S254, CPU (central processing unit) calculate the maximum deviation H1 of the pad value D set in D1 and step S21;
It is A that S255, inner programmable signal generator produce amplitude size, and frequency is the sine wave letter of 1.025*F, and by a program control selector switch, this signal is exported to programmable attenuator;
S256, programmable attenuator are decayed to signal, and the signal after decay exports to winding deformation tester by response signal output terminal and coupled program control selector switch;
S257, winding deformation tester measure the pad value D2 of the signal after decay;
S258, CPU (central processing unit) calculate the maximum deviation H2 of the pad value D set in D2 and step S21.Like this, the frequency-selective filtering 0.975*F-1.025*F i.e. pad value of 5% bandwidth is the less absolute value of of absolute value in H1, H2.Above-mentioned pad value D1 and D2 may be used for the frequency antijamming capability verifying winding deformation tester, and such as, when pad value D is set as-20dB, D1, D2 are less than-20dB and illustrate that tester possesses frequency antijamming capability, otherwise do not possess frequency antijamming capability.
Described signal frequency detects and comprises the following steps:
S31, be E by keyboard or by the internal processes of calibrating installation by the frequency setting of calibrating installation;
S32, winding deformation tester output frequency are the signal of E;
The external signal input terminals of S33, calibrating installation receives the signal of winding deformation tester output and by a program control selector switch, this signal is outputted to equally accurate frequency tester;
S34, equally accurate frequency tester measure current demand signal frequency E1;
S35, CPU (central processing unit) calculate the maximum deviation of the frequency E that calibrating installation presets in E1 and step S31.
Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (10)
1. the calibrating installation of transformer method of frequency response method winding deformation tester, is characterized in that, comprising:
External signal input terminals, for connecting the signal end of winding deformation tester, receives external input signal;
Inner programmable signal generator, for generation of inner program control signal;
Programmable attenuator, the inside program control signal produced for the external input signal that receives external signal input terminals or inner programmable signal generator is decayed;
Pumping signal output terminal, for connecting the excitation end of winding deformation tester, exports the external input signal of the signal after programmable attenuator decay or external signal input terminals reception or the inside program control signal of inner programmable signal generator generation;
Response signal output terminal, for connecting the responder of winding deformation tester, exports the external input signal of the signal after programmable attenuator decay or external signal input terminals reception or the inside program control signal of inner programmable signal generator generation;
Program control collector, for gather programmable attenuator decay after signal or external signal input terminals receive external input signal or inner programmable signal generator produce inside program control signal;
CPU (central processing unit), for the treatment of the signal data that program control collector gathers, and controls inner programmable signal generator, programmable attenuator, program control collector.
2. the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 1, it is characterized in that, described programmable attenuator connects external signal input terminals and inner programmable signal generator by a program control selector switch, for selecting external input signal or the inner program control signal input signal as programmable attenuator; Described pumping signal output terminal, response signal output terminal, program control collector all respectively connect external signal input terminals, inner programmable signal generator, programmable attenuator by a program control selector switch simultaneously, for carrying out the selection of external input signal, inner program control signal and attenuator output signal.
3. the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 2, it is characterized in that, also comprise equally accurate frequency tester, these Precision Measuring Frequency devices connect external signal input terminals and inner programmable signal generator by a program control selector switch, for selecting external input signal or the inner program control signal input signal as equally accurate frequency tester.
4. the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 3, it is characterized in that, association's processing unit that described CPU (central processing unit) comprises central processing unit and is connected with central processing unit, described inner programmable signal generator, programmable attenuator, program control collector, program control selector switch, equally accurate frequency tester are all connected with assisting processing unit.
5. the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 4, is characterized in that, described central processing unit is also connected with display, keyboard, USB access unit, network insertion unit.
6. according to the calibrating installation of the arbitrary described transformer method of frequency response method winding deformation tester of claim 1 to 5, it is characterized in that, described programmable attenuator is made up of seven grades of attenuator cascades of 1dB, 2 dB, 4 dB, 8 dB, 16dB, 32dB, 37 dB, and every grade of attenuator is also parallel with the attenuation units of a 0dB by a selector switch.
7. according to the calibrating installation of the arbitrary described transformer method of frequency response method winding deformation tester of claim 1 to 5, it is characterized in that, described inner programmable signal generator comprises the DDS generator, Hi-pass filter, low-pass filter and the amplifier that are connected successively, and described DDS generator is also connected with 16 the DA conversion equipments controlling its reference current.
8. according to the calibrating installation of the arbitrary described transformer method of frequency response method winding deformation tester of claim 1 to 5, it is characterized in that, described program control collector comprises the impedance transformation unit, programme-controlled gain unit, AD conversion unit, data acquisition unit, the data outputting unit that are connected successively, wherein:
Impedance transformation unit, exporting for realizing high resistant input low-resistance, reducing programme-controlled gain unit to the impact of front end input signal;
Programme-controlled gain unit, for amplifying impedance transformation element output signal;
AD conversion unit, is converted to digital signal for the simulating signal exported by programme-controlled gain unit;
Data acquisition unit, stores for the digital signal exported AD conversion unit;
Data outputting unit, the image data for being stored by data acquisition unit is transferred to CPU (central processing unit) and processes.
9. the measuring method of the calibrating installation of transformer method of frequency response method winding deformation tester, it is characterized in that, comprise the detection of frequency-selective filtering frequency bandwidth, signal attenuation value accuracy detection and signal frequency to detect, during detection, the external signal input terminals of calibrating installation is connected the signal end of winding deformation tester, the excitation end of pumping signal output terminal connection winding deformation tester, the responder of response signal output terminal connection winding deformation tester;
Described signal attenuation value accuracy detection comprises the following steps:
The pad value of S11, setting programmable attenuator;
S12, external signal input terminals receive the signal of the signal end of winding deformation tester, and the signal of reception outputs to programmable attenuator, pumping signal output terminal respectively by two program control selector switchs;
S13, programmable attenuator are decayed to signal, and the signal after decay exports to response signal output terminal by a program control selector switch;
Signal after decay is exported to the responder of winding deformation tester by S14, response signal output terminal;
Signal is exported to the excitation end of winding deformation tester by S15, pumping signal output terminal;
S16, the excitation end signal output terminal of winding deformation tester sweep measurement calibrating installation and the output signal of responder signal output part, and calculate pad value;
The maximum deviation of the pad value preset in the pad value that in S17, calculation procedure S16, winding deformation tester sweep measurement goes out and step S11;
Described frequency-selective filtering frequency bandwidth detects and comprises the following steps:
S21, the setting pad value D of programmable attenuator and the centre frequency F of winding deformation tester frequency-selective filtering;
The signal end of S22, winding deformation tester exports the sine wave signal of fixed frequency F;
S23, external signal input terminals receive the sine wave signal of winding deformation tester output and by a program control selector switch, this sine wave signal are outputted to programmable data collector;
This sine wave signal is outputted to CPU (central processing unit) by S24, programmable data collector, and CPU (central processing unit) calculates the amplitude A of this sine wave signal;
S25, inner programmable signal generator produce for frequency the sine wave signal that amplitude size is A with filtering upper limiting frequency and filtering lower frequency limit respectively, carry out filtering upper limit bandwidth detection and filtering lower limit bandwidth detection;
Described signal frequency detects and comprises the following steps:
S31, be E by the frequency setting of calibrating installation;
S32, winding deformation tester output frequency are the signal of E;
The external signal input terminals of S33, calibrating installation receives the signal of winding deformation tester output and by a program control selector switch, this signal is outputted to equally accurate frequency tester;
S34, equally accurate frequency tester measure current demand signal frequency E1;
S35, CPU (central processing unit) calculate the maximum deviation of the frequency E that calibrating installation presets in E1 and step S31.
10., according to the measuring method of the calibrating installation of claim 9 transformer method of frequency response method winding deformation tester, it is characterized in that, step S25 is further comprising the steps:
S251, described filtering lower frequency limit get 0.975*F, and inner programmable signal generator generation amplitude size is A, frequency is the sine wave signal of 0.975*F, and by a program control selector switch, this signal is exported to programmable attenuator;
S252, programmable attenuator are decayed to signal, and the signal after decay exports to winding deformation tester by response signal output terminal and coupled program control selector switch;
S253, winding deformation tester measure the pad value D1 of the signal after decay;
S254, CPU (central processing unit) calculate the maximum deviation of the pad value D set in D1 and step S21;
S255, described filtering upper limiting frequency get 1.025*F, and it is A that inner programmable signal generator produces amplitude size, and frequency is the sine wave letter of 1.025*F, and by a program control selector switch, this signal is exported to programmable attenuator;
S256, programmable attenuator are decayed to signal, and the signal after decay exports to winding deformation tester by response signal output terminal and coupled program control selector switch;
S257, winding deformation tester measure the pad value D2 of the signal after decay;
S258, CPU (central processing unit) calculate the maximum deviation of the pad value D set in D2 and step S21.
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