CN104535955B - The calibrating installation and its calibration method of transformer method of frequency response method winding deformation tester - Google Patents
The calibrating installation and its calibration method of transformer method of frequency response method winding deformation tester Download PDFInfo
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- CN104535955B CN104535955B CN201510020178.7A CN201510020178A CN104535955B CN 104535955 B CN104535955 B CN 104535955B CN 201510020178 A CN201510020178 A CN 201510020178A CN 104535955 B CN104535955 B CN 104535955B
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Abstract
The invention discloses a kind of calibrating installation of transformer method of frequency response method winding deformation tester and its measuring method, calibrating installation includes：The external signal input terminals that receive external input signal, the inside programmable signal generator for producing internal program control signal, the programmable attenuator decayed to signal, to winding deformation tester encourage end output signal pumping signal output end, to winding deformation tester output end output signal response signal output end；Gather program control collector, the CPU of the signal data of the program control collector collection of processing of external input signal or internal program control signal or attenuated signal.The calibrating installation of the present invention is used to measuring and examining and determine transformer method of frequency response method winding deformation tester, it is ensured that winding deformation frequency sound test instrument precision, and the safe operation to guarantee transformer is significant.
Description
Technical field
The present invention relates to transformer testing engineering device technique field, in particular it relates to a kind of transformer method of frequency response method winding deformation
The calibrating installation and its calibration method of tester.
Background technology
Transformer is the nucleus equipment of power network, and winding deformation is one of most common internal fault of power transformer, actively
Carry out deformation of transformer winding diagnostic work, the transformer for having winding deformation is found in time, and in a planned way enter office staff's cover inspection
And maintenance, substantial amounts of human and material resources can be not only saved, and also have and its important work to the generation for preventing Accident of Transformer
With.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 edition 18 is counter to be arranged
Highly important position is placed on the short circuit of transformer near region and winding deformation is prevented.At present, the test winding commonly used both at home and abroad becomes
The method of shape has frequency response analysis and a short circuit impedance method, and wherein frequency response analysis is that China is the most frequently used at present, most
One of means of effective detection winding deformation.
For the winding deformation of accurate measuring transformer, first have to ensure the precision of winding deformation frequency sound test instrument itself.
The producer of production winding deformation frequency sound test device is many both at home and abroad at present, there are different detection marks between different producers
Standard, data can not compare between causing different device；The change of even same device over time, the amplitude versus frequency characte of its own
Also it can change, the basic of response curve comparison can also deteriorate before and after causing same device；So control frequency sound test instrument
Amplitude versus frequency characte is to ensure that method of frequency response method detection winding deforms the necessary means of the degree of accuracy；This is accomplished by becoming by a set of professional winding
Its amplitude versus frequency characte is investigated, demarcated to shape frequency sound test instrument verification system.Current power system winding deformation frequency sound test instrument is
Through popularization, each electric company is all configured with winding deformation frequency sound test instrument substantially, but not yet has the mechanism opposing connection of correlation at this stage
Group deformation tester is accurately examined and determine.
The content of the invention
The purpose of the present invention be that overcome the shortcoming and defect of above-mentioned prior art there is provided a kind of transformer method of frequency response method around
The calibrating installation of group deformation tester, to ensure the precision of winding deformation frequency sound test instrument itself, present invention also offers its inspection
Determine method.
The present invention the used technical scheme that solves the above problems is：
The calibrating installation of transformer method of frequency response method winding deformation tester, including：
External signal input terminals, the signal end for connecting winding deformation tester receives external input signal；
Internal programmable signal generator, for producing internal program control signal；
Programmable attenuator, for the external input signal or internal programmable signal generator received to external signal input terminals
The inside program control signal of generation is decayed；
Pumping signal output end, the excitation end for connecting winding deformation tester, after output programmable attenuator decay
The inside program control signal that the external input signal or internal programmable signal generator that signal or external signal input terminals are received are produced；
Response signal output end, the responder for connecting winding deformation tester, after output programmable attenuator decay
The inside program control signal that the external input signal or internal programmable signal generator that signal or external signal input terminals are received are produced；
Program control collector, the outside for gathering the signal after programmable attenuator decay or external signal input terminals reception is defeated
Enter the inside program control signal that signal or internal programmable signal generator are produced；
CPU, the signal data for handling the collection of program control collector, and to internal programmable signal generator,
Programmable attenuator, program control collector are controlled.
As a further improvement on the present invention, the programmable attenuator is defeated by a program control selector connection external signal
Enter end and internal programmable signal generator, for selecting to regard external input signal or internal program control signal as programmable attenuator
Input signal；The pumping signal output end, response signal output end, program control collector are respectively same by a program control selector
When connection external signal input terminals, internal programmable signal generator, programmable attenuator, for carrying out external input signal, inside
The selection of program control signal and attenuator output signal.
Further, the calibrating installation of above-mentioned transformer method of frequency response method winding deformation tester also includes equally accurate frequency tester, should
Equally accurate frequency tester connects external signal input terminals and internal programmable signal generator by a program control selector, for selecting
Using external input signal or internal program control signal as equally accurate frequency tester input signal.
Further, the CPU includes central processing unit and the association's processing unit being connected with central processing unit,
The internal programmable signal generator, programmable attenuator, program control collector, program control selector, equally accurate frequency tester with association
Unit is managed to be connected.
Further, display, keyboard, USB access units, network insertion unit are also associated with the central processing unit.
Further, the programmable attenuator by 1dB, 2 dB, 4 dB, 8 dB, 16dB, 32dB, 37 dB seven grades of attenuators
Cascade is constituted, and every grade of attenuator is also parallel with 0dB attenuation units by a selecting switch.
Further, the internal programmable signal generator includes the DDS generators, high-pass filter, low pass being sequentially connected
Wave filter and amplifier, the DDS generators are also associated with controlling 16 DA conversion equipments of its reference current.
Further, the program control collector includes the impedance converter unit, programme-controlled gain unit, AD conversion list being sequentially connected
Member, data acquisition unit, data outputting unit, wherein：
Impedance converter unit, for realizing high resistant input low-resistance output, reduces programme-controlled gain unit to front end input signal
Influence；
Programme-controlled gain unit, for being amplified to impedance converter unit output signal；
AD conversion unit, the analog signal for programme-controlled gain unit to be exported is converted to data signal；
Data acquisition unit, for being stored to the data signal that AD conversion unit is exported；
Data outputting unit, the gathered data for data acquisition unit to be stored is transferred at CPU
Reason.
The measuring method of the calibrating installation of transformer method of frequency response method winding deformation tester, including the inspection of frequency-selective filtering frequency bandwidth
Survey, signal attenuation value accuracy detection and signal frequency are detected, during detection, the external signal input terminals of calibrating installation are connected into winding
The signal end of deformation tester, the excitation end of pumping signal output end connection winding deformation tester, response signal output end connect
Connect the responder of winding deformation tester；
The signal attenuation value accuracy detection comprises the following steps：
S11, the pad value for setting programmable attenuator；
S12, external signal input terminals receive the signal of the signal end of winding deformation tester, and the signal of reception passes through two
Program control selector is respectively outputted to programmable attenuator, pumping signal output end；
S13, programmable attenuator are decayed to signal, and the signal after decay is exported to response by a program control selector
Signal output part；
The responder of S14, response signal output end by the signal output after decay to winding deformation tester；
The excitation end of S15, pumping signal output end by signal output to winding deformation tester；
S16, winding deformation tester sweep measurement calibrating installation excitation end signal output end and responder signal output
The output signal at end, and calculate pad value；
Preset in winding deformation tester sweep measurement goes out in S17, calculation procedure S16 pad value and step S11
Pad value maximum deviation；
The frequency-selective filtering frequency bandwidth detection comprises the following steps：
The centre frequency F of S21, the pad value D for setting programmable attenuator and winding deformation tester frequency-selective filtering；
S22, the signal end output fixed frequency F of winding deformation tester sine wave signal；
S23, external signal input terminals receive the sine wave signal of winding deformation tester output and pass through a program control choosing
Select device and the sine wave signal is output to programmable data collector；
The sine wave signal is output to CPU by S24, programmable data collector, and CPU is calculated should
The amplitude A of sine wave signal；
S25, internal programmable signal generator produce amplitude to filter upper limiting frequency and filtering lower frequency limit as frequency respectively
Size is A sine wave signal, is filtered upper limit bandwidth detection and filtering lower limit bandwidth detection；
The signal frequency detection comprises the following steps：
S31, by the frequency setting of calibrating installation be E；
S32, winding deformation tester output frequency are E signal；
S33, the external signal input terminals of calibrating installation receive the signal of winding deformation tester output and pass through a journey
Control selector outputs this signal to equally accurate frequency tester；
S34, equally accurate frequency tester measure current demand signal frequency E1；
S35, CPU calculate the maximum deviation of calibrating installation frequency E set in advance in E1 and step S31.
Further, step S25 further comprises the steps：
S251, the filtering lower frequency limit take 0.975*F, and it is A, frequency that internal programmable signal generator, which produces amplitude size,
For 0.975*F sine wave signal, and by a program control selector by the signal output to programmable attenuator；
S252, programmable attenuator are decayed to signal, the signal after decay by response signal output end and and its
Connected program control selector is exported to winding deformation tester；
S253, winding deformation tester measure the pad value D1 of the signal after decay；
S254, CPU calculate the pad value D set in D1 and step S21 maximum deviation；
S255, the filtering upper limiting frequency take 1.025*F, and it is A, frequency that internal programmable signal generator, which produces amplitude size,
For 1.025*F sine wave believe, and by a program control selector by the signal output to programmable attenuator；
S256, programmable attenuator are decayed to signal, the signal after decay by response signal output end and and its
Connected program control selector is exported to winding deformation tester；
S257, winding deformation tester measure the pad value D2 of the signal after decay；
S258, CPU calculate the pad value D set in D2 and step S21 maximum deviation.
To sum up, the beneficial effects of the invention are as follows：
1st, the calibrating installation of transformer method of frequency response method winding deformation tester of the invention is used to measure and examine and determine transformer frequently
The method of sound winding deformation tester, it is ensured that winding deformation frequency sound test instrument precision, the safe operation to ensureing transformer has important
Meaning；
2nd, calibrating installation of the invention uses programmable attenuator technology, passes through the programmable stage of high-speed, high precision operational amplifier
Connection mode realizes the dynamic detection of wide scope, high precision, detection range -100dB~20dB, and high resolution is up to 1 dB；
3rd, calibrating installation of the invention is using internal program control technology, using high-precision DDS generators, realize to transformer around
The frequency-selective filtering bandwidth measurement of group deformation tester；
4th, the present invention realizes transformer by the equally accurate Technology of Frequency Measurement by Using of the 100MHz temperature compensating crystal oscillators of high-precision and high-stability
The 500Hz-2MHz of method of frequency response method winding deformation tester high-precision frequency detecting；
5th, calibrating installation of the invention uses display screen, and can external access of mouse, it is easy to operate, succinct；Can by USB, with
Too net and WIFI is connected with computer, is easy to on-line operation and data sharing, printing.
Brief description of the drawings
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 internal programmable signal generator；
Fig. 4 is a kind of embodiment schematic diagram of program control collector.
Embodiment
With reference to embodiment and accompanying drawing, make detailed description further, but embodiments of the present invention to the present invention
Not limited to this.
Embodiment 1：
As shown in figure 1, the calibrating installation of transformer method of frequency response method winding deformation tester, including：
External signal input terminals, the signal end for connecting winding deformation tester receives external input signal；
Internal programmable signal generator, for producing internal program control signal；
Programmable attenuator, for the external input signal or internal programmable signal generator received to external signal input terminals
The inside program control signal of generation is decayed；
Pumping signal output end, the excitation end for connecting winding deformation tester, after output programmable attenuator decay
The inside program control signal that the external input signal or internal programmable signal generator that signal or external signal input terminals are received are produced；
Response signal output end, the responder for connecting winding deformation tester, after output programmable attenuator decay
The inside program control signal that the external input signal or internal programmable signal generator that signal or external signal input terminals are received are produced；
Program control collector, the outside for gathering the signal after programmable attenuator decay or external signal input terminals reception is defeated
Enter the inside program control signal that signal or internal programmable signal generator are produced；
CPU, the signal data for handling the collection of program control collector, and to internal programmable signal generator,
Programmable attenuator, program control collector are controlled.
The programmable attenuator by program control selector A connection external signal input terminals and internal programmable signal generator,
Program control selector A be used to selecting using external input signal or internal program control signal as programmable attenuator input signal；It is described
Pumping signal output end, response signal output end, program control collector connect outside letter simultaneously by program control selector B, C, D respectively
Number input, internal programmable signal generator, programmable attenuator, program control selector B, C, D be used to carrying out external input signal, interior
The selection of portion's program control signal and attenuator output signal.
The CPU includes central processing unit and the association's processing unit being connected with central processing unit, the inside
Programmable signal generator, programmable attenuator, program control collector, program control selector A, B, C, D are connected with assisting processing unit.
Display, keyboard, USB access units, network insertion unit are also associated with the central processing unit.
Association's processing unit in the present embodiment uses programmable logic cells, for realizing central processing unit and each program control list
Valid data communication between member, realizes the data cache of program control collector；And central processing unit is declined using insertion at a high speed
Processor, substantial amounts of gathered data can be handled in real time.
Display uses high brightness and resolution technical grade liquid crystal display, carries high sensitivity technical grade touch-screen；Key
Disk uses the matrix keyboard of 4x4 touch keys；Make the easy to operate, succinct of calibrating installation.
USB access units include 4 USB2.0 Host Controler Interfaces, facilitate user to plug into USB mouse, USB keyboard and USB flash disk
Deng USB device；Network insertion unit includes 1 10/100M Ethernets interface and/or WIFI module, calibrating installation is led to
Cross USB, Ethernet and WIFI to be connected with computer, be easy to on-line operation and data sharing, printing, be also convenient for user and pass through calculating
Machine remote control.
Embodiment 2：
On the basis of embodiment 1, the calibrating installation of the present embodiment also includes equally accurate frequency tester, the equally accurate frequency tester
By program control selector E connection external signal input terminals and internal programmable signal generator, program control selector E is used for selection will be outer
Portion's input signal or internal program control signal as equally accurate frequency tester input signal.The program control selector E, equally accurate frequency measurement
Device is all connected on association's processing unit.Equally accurate frequency tester in the present embodiment from can realize in the prior art 500Hz-
The shaping filter measurement of 2MHz optional frequency sine waves, input sine wave amplitude range 0.1Vpp -25Vpp, frequency-measurement accuracy 100,000
/ mono- frequency tester, realizes transformer frequently by the equally accurate Technology of Frequency Measurement by Using of the 100MHz temperature compensating crystal oscillators of high-precision and high-stability
The 500Hz-2MHz of the method for sound winding deformation tester high-precision frequency detecting.
Embodiment 3：
On the basis of embodiment 1 or embodiment 2, in the present embodiment, programmable attenuator, internal program control signal occur
Device, program control collector are further improved：
As shown in Fig. 2 the programmable attenuator is declined by 1dB, 2 dB, 4 dB, 8 dB, 16dB, 32dB, seven grades of 37 dB
Subtract device cascade composition, every grade of attenuator is also parallel with 0dB attenuation units, the work of selecting switch by a selecting switch
With the selection for being to provide two kinds of paths, signal passes through into every grade of attenuator by the attenuator or by 0dB attenuator.This
In embodiment, programmable attenuator is realized using seven grades of attenuators by index cascade system, and 88 dB that for example to decay are equal to decay
37dB adds decay 2dB plus decay 1dB plus decay 32dB plus decay 16dB, and the 20dB that to decay is equal to the 16dB that decays and added
Decay 4dB, and a piece of high-accuracy broadband operational amplifier is all employed per one-level, effectively overcomes and uses resistance in the prior art
The temperature drift and the defect of precision aspect for being decayed with the mode of capacitance partial pressure brought.The programmable attenuator of the present embodiment can
Realize 500Hz -2MHz optional frequencies sine wave 1dB in the range of -100dB -0dB step-length（If needed even can be very
Easily realize 0.1dB step-length）, -50 dB -0dB decay dB values degrees of accuracy are better than ± 0.01dB, -80 dB--50dB decay
The degree of accuracy of dB values is better than ± 0.02dB, and -100 dB--80dB decay dB values degrees of accuracy are better than ± 0.05dB, and in the prior art
Carrying out decaying by the way of resistance and capacitance partial pressure typically all only realizes the step-length of 10dB in the range of -50dB -0dB, and
It is sometimes even more big and -50 dB -0dB decay dB value degrees of accuracy can only achieve ± 1dB.Therefore program control in the present embodiment declines
Subtract that device precision is higher, the degree of accuracy is bigger.
As shown in figure 3, the DDS generators, high-pass filter, low that the internal programmable signal generator includes being sequentially connected
The amplifier of bandpass filter and 20dB, the DDS generators are also associated with controlling 16 DA conversion equipments of its reference current.Should
Internal programmable signal generator can realize the sinewave output of any amplitudes of 0-25Vpp of 500Hz-2MHz optional frequencies, frequency
Resolution ratio is better than 0.05Hz, and amplitude resolution is better than 0.5mV.The frequency resolution for having benefited from this DDS generator is up to 1/
2E32, amplitude resolution is up to 1/2E16, high-pass filtering is carried out to output signal and low by high-pass filter, low pass filter
Pass filter further reduces interference of the noise to signal.
As shown in figure 4, the program control collector include be sequentially connected impedance converter unit, programme-controlled gain unit, 16
AD conversion unit, data acquisition unit, data outputting unit, impedance converter unit mainly realize high resistant input low-resistance output, subtract
Influence of the small programme-controlled gain unit to front end input signal, the impedance converter unit can use but be not limited to operational amplifier reality
It is existing；Programme-controlled gain unit is mainly realized that 1 times, 10 times, 100 times and 1000 times to impedance converter unit output signal is program control and put
Greatly；16 AD conversion units are mainly realized to the high-precision high-speed analog signal of programme-controlled gain element output signal to data signal
Conversion；Data acquisition unit mainly realizes the high-speed data processing of the data signal to 16 AD conversion unit output；Data
The gathered data that data acquisition unit is stored mainly is transferred to association's processing unit and handled by output unit.In the present embodiment
Program control collector can provide the collection clock of 16 AD conversion units using another high-speed, high precision DDS generators, can be achieved
The signal acquisition of any sample rates of 10Kbps -50Mbps, sample rate resolution ratio be better than 0.05Hz, be sampled signal amplitude scope -
12.5 V -+12.5V, frequency range 500Hz -2MHz, 1-1000 times of programme-controlled gain.
The measuring method of the calibrating installation of transformer method of frequency response method winding deformation tester, including frequency-selective filtering is described below
Frequency bandwidth detection, signal attenuation value accuracy detection and signal frequency detection, during detection, the external signal of calibrating installation is inputted
The signal end of end connection winding deformation tester, the excitation end of pumping signal output end connection winding deformation tester, response letter
Number output end connects the responder of winding deformation tester；Frequency-selective filtering frequency bandwidth detection, signal attenuation value accuracy detection and
Signal frequency detects order in no particular order.
The signal attenuation value accuracy detection comprises the following steps：
S11, the pad value for setting by keyboard or by the internal processes of calibrating installation 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 passes through one
Program control selector is output to programmable attenuator, is output to pumping signal output end by another program control selector；
S13, programmable attenuator are decayed to signal, and the signal after decay is exported to response by a program control selector
Signal output part；
The responder of S14, response signal output end by the signal output after decay to winding deformation tester；
The excitation end of S15, pumping signal output end by signal output to winding deformation tester, this step and step S13
With step S14 in no particular order order；
S16, winding deformation tester sweep measurement calibrating installation excitation end signal output end and responder signal output
The output signal at end, and calculate pad value；
S17, the pad value that winding deformation tester sweep measurement goes out is input to calibrating installation, CPU is calculated
The maximum deviation of the pad value that winding deformation tester sweep measurement goes out and pad value set in advance in step S11, it is foregoing to incite somebody to action
The pad value that winding deformation tester sweep measurement goes out is input to calibrating installation and can inputted by input keyboard.
The frequency-selective filtering frequency bandwidth detection comprises the following steps：
S21, the pad value D, such as -20dB for setting by keyboard or by the internal processes of calibrating installation programmable attenuator
With the centre frequency F of the frequency-selective filtering of winding deformation tester；
S22, the signal end output fixed frequency F of winding deformation tester sine wave signal；
S23, external signal input terminals receive the sine wave signal of winding deformation tester output and pass through a program control choosing
Select device and the sine wave signal is output to programmable data collector；
The sine wave signal is output to CPU by S24, programmable data collector, and CPU is calculated should
The amplitude A of sine wave signal；The amplitude of sine wave signal is measured for prior art, its side of implementing is repeated no more in the present invention
Method；
S25, internal programmable signal generator produce amplitude to filter upper limiting frequency and filtering lower frequency limit as frequency respectively
Size is A sine wave signal, is filtered upper limit bandwidth detection and filtering lower limit bandwidth detection；In the present embodiment, under filtering
Limit frequency takes 0.975*F, and filtering upper limiting frequency takes 1.025*F, filtering upper limit bandwidth detection and filtering lower limit bandwidth detection regardless of
Sequencing, filtering upper limit bandwidth detection includes following step S255-258, and filtering lower limit bandwidth detection specifically includes following
Step 251- steps 254：
It is the sine wave signal that A, frequency are 0.975*F that S251, internal programmable signal generator, which produce amplitude size, and is led to
A program control selector is crossed by the signal output to programmable attenuator；
S252, programmable attenuator are decayed to signal, the signal after decay by response signal output end and and its
Connected program control selector is exported to winding deformation tester；
S253, winding deformation tester measure the pad value D1 of the signal after decay；
S254, CPU calculate the pad value D set in D1 and step S21 maximum deviation H1；
It is A that S255, internal programmable signal generator, which produce amplitude size, and frequency is believed for 1.025*F sine wave, and passes through
One program control selector is by the signal output to programmable attenuator；
S256, programmable attenuator are decayed to signal, the signal after decay by response signal output end and and its
Connected program control selector is exported to winding deformation tester；
S257, winding deformation tester measure the pad value D2 of the signal after decay；
S258, CPU calculate the pad value D set in D2 and step S21 maximum deviation H2.So, frequency-selecting
It is that the pad value of 5% bandwidth is the absolute value of less one of absolute value in H1, H2 to filter 0.975*F-1.025*F.It is above-mentioned
Pad value D1 and D2 can be used for the frequency antijamming capability for verifying winding deformation tester, and such as pad value D is set as -20dB
When, D1, D2 illustrate that tester possesses frequency antijamming capability less than -20dB, otherwise do not possess frequency antijamming capability.
The signal frequency detection comprises the following steps：
S31, by keyboard or by the internal processes of calibrating installation by the frequency setting of calibrating installation it is E；
S32, winding deformation tester output frequency are E signal；
S33, the external signal input terminals of calibrating installation receive the signal of winding deformation tester output and pass through a journey
Control selector outputs this signal to equally accurate frequency tester；
S34, equally accurate frequency tester measure current demand signal frequency E1；
S35, CPU calculate the maximum deviation of calibrating installation frequency E set in advance in E1 and step S31.
It the above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention should be regarded as the protection of the present invention
Scope.
Claims (9)
1. the calibrating installation of transformer method of frequency response method winding deformation tester, it is characterised in that including：
External signal input terminals, the signal end for connecting winding deformation tester receives external input signal；
Internal programmable signal generator, for producing internal program control signal；
Programmable attenuator, external input signal or internal programmable signal generator for being received to external signal input terminals are produced
Inside program control signal decayed；
Pumping signal output end, the excitation end for connecting winding deformation tester, the signal after output programmable attenuator decay
Or the inside program control signal that the external input signal or internal programmable signal generator of external signal input terminals reception are produced；
Response signal output end, the responder for connecting winding deformation tester, the signal after output programmable attenuator decay
Or the inside program control signal that the external input signal or internal programmable signal generator of external signal input terminals reception are produced；
Program control collector, for gathering the outside input letter that signal or external signal input terminals after programmable attenuator decay are received
Number or the inside program control signal that produces of internal programmable signal generator；
CPU, the signal data for handling the collection of program control collector, and to internal programmable signal generator, program control
Attenuator, program control collector are controlled；
The programmable attenuator connects external signal input terminals and internal programmable signal generator by a program control selector, uses
In selection using external input signal or internal program control signal as programmable attenuator input signal；The pumping signal output
End, response signal output end, program control collector respectively connect external signal input terminals, inside simultaneously by a program control selector
Programmable signal generator, programmable attenuator, for carrying out external input signal, internal program control signal and attenuator output signal
Selection.
2. the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 1, it is characterised in that also wrap
Equally accurate frequency tester is included, the equally accurate frequency tester connects external signal input terminals and internal program control letter by a program control selector
Number generator, for select using external input signal or internal program control signal as equally accurate frequency tester input signal.
3. the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 2, it is characterised in that described
CPU includes central processing unit and the association's processing unit being connected with central processing unit, and the internal program control signal occurs
Device, programmable attenuator, program control collector, program control selector, equally accurate frequency tester are connected with assisting processing unit.
4. the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 3, it is characterised in that described
Display, keyboard, USB access units, network insertion unit are also associated with central processing unit.
5. according to the calibrating installation of any described transformer method of frequency response method winding deformation tester of Claims 1-4, its feature exists
In the programmable attenuator is made up of 1dB, 2 dB, 4 dB, 8 dB, 16dB, 32dB, 37 dB seven grades of attenuators cascade, often
Level attenuator is also parallel with 0dB attenuation units by a selecting switch.
6. according to the calibrating installation of any described transformer method of frequency response method winding deformation tester of Claims 1-4, its feature exists
In the internal programmable signal generator includes DDS generators, high-pass filter, low pass filter and the amplification being sequentially connected
Device, the DDS generators are also associated with controlling 16 DA conversion equipments of its reference current.
7. according to the calibrating installation of any described transformer method of frequency response method winding deformation tester of Claims 1-4, its feature exists
In the program control collector includes the impedance converter unit being sequentially connected, programme-controlled gain unit, AD conversion unit, data acquisition
Unit, data outputting unit, wherein：
Impedance converter unit, for realizing high resistant input low-resistance output, reduces shadow of the programme-controlled gain unit to front end input signal
Ring；
Programme-controlled gain unit, for being amplified to impedance converter unit output signal；
AD conversion unit, the analog signal for programme-controlled gain unit to be exported is converted to data signal；
Data acquisition unit, for being stored to the data signal that AD conversion unit is exported；
Data outputting unit, the gathered data for data acquisition unit to be stored is transferred to CPU and handled.
8. the measuring method of the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 2, it is special
Levy and be, including the detection of frequency-selective filtering frequency bandwidth, signal attenuation value accuracy detection and signal frequency detection, during detection, it will examine
Determine the signal end of the external signal input terminals connection winding deformation tester of device, pumping signal output end connection winding deformation to survey
Try the responder that the excitation end of instrument, response signal output end connect winding deformation tester；
The signal attenuation value accuracy detection comprises the following steps：
S11, the pad value for setting programmable attenuator；
S12, external signal input terminals receive the signal of the signal end of winding deformation tester, and the signal of reception is program control by two
Selector is respectively outputted to programmable attenuator, pumping signal output end；
S13, programmable attenuator are decayed to signal, and the signal after decay is exported to response signal by a program control selector
Output end；
The responder of S14, response signal output end by the signal output after decay to winding deformation tester；
The excitation end of S15, pumping signal output end by signal output to winding deformation tester；
S16, the excitation end signal output end of winding deformation tester sweep measurement calibrating installation and responder signal output part
Output signal, and calculate pad value；
It is set in advance in winding deformation tester sweep measurement goes out in S17, calculation procedure S16 pad value and step S11 to decline
The maximum deviation of depreciation；
The frequency-selective filtering frequency bandwidth detection comprises the following steps：
S21, the pad value D for setting programmable attenuator and winding deformation tester frequency-selective filtering centre frequency F；
S22, the signal end output fixed frequency F of winding deformation tester sine wave signal；
S23, external signal input terminals receive the sine wave signal of winding deformation tester output and pass through a program control selector
The sine wave signal is output to programmable data collector；
The sine wave signal is output to CPU by S24, programmable data collector, and CPU calculates the sine
The amplitude A of ripple signal；
S25, internal programmable signal generator produce amplitude size to filter upper limiting frequency and filtering lower frequency limit as frequency respectively
For A sine wave signal, upper limit bandwidth detection and filtering lower limit bandwidth detection are filtered；
The signal frequency detection comprises the following steps：
S31, by the frequency setting of calibrating installation be E；
S32, winding deformation tester output frequency are E signal；
S33, the external signal input terminals of calibrating installation receive the signal of winding deformation tester output and pass through a program control choosing
Select device and output this signal to equally accurate frequency tester；
S34, equally accurate frequency tester measure current demand signal frequency E1；
S35, CPU calculate the maximum deviation of calibrating installation frequency E set in advance in E1 and step S31.
9. the measuring method of the calibrating installation of transformer method of frequency response method winding deformation tester according to claim 8, it is special
Levy and be, step S25 further comprises the steps：
S251, the filtering lower frequency limit take 0.975*F, and it is that A, frequency are that internal programmable signal generator, which produces amplitude size,
0.975*F sine wave signal, and by a program control selector by the signal output to programmable attenuator；
S252, programmable attenuator are decayed to signal, and the signal after decay passes through response signal output end and coupled
Program control selector export to winding deformation tester；
S253, winding deformation tester measure the pad value D1 of the signal after decay；
S254, CPU calculate the pad value D set in D1 and step S21 maximum deviation；
S255, the filtering upper limiting frequency take 1.025*F, and it is A that internal programmable signal generator, which produces amplitude size, and frequency is
1.025*F sine wave letter, and by a program control selector by the signal output to programmable attenuator；
S256, programmable attenuator are decayed to signal, and the signal after decay passes through response signal output end and coupled
Program control selector export to winding deformation tester；
S257, winding deformation tester measure the pad value D2 of the signal after decay；
S258, CPU calculate the pad value D set in D2 and step S21 maximum deviation.
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| CN106610464B (en) * | 2016-11-11 | 2019-06-18 | 国网四川省电力公司电力科学研究院 | Determine the system and method for deformation of transformer winding tester frequency-selective filtering performance |
| CN107037312A (en) * | 2016-11-28 | 2017-08-11 | 国家电网公司 | A kind of Transformer Winding Building of Simulation Model method for frequency sweep impedance method |
| CN107561162A (en) * | 2017-08-23 | 2018-01-09 | 西北工业大学 | A kind of reflectoscope automatic verification system |
| CN108919042A (en) * | 2018-09-18 | 2018-11-30 | 国网辽宁省电力有限公司电力科学研究院 | A kind of winding deformation of power transformer test device convenient for test |
| CN111208374A (en) * | 2020-02-28 | 2020-05-29 | 中国电力科学研究院有限公司 | Device and method for injecting sinusoidal excitation signal into transformer winding |
| CN111610363A (en) * | 2020-03-14 | 2020-09-01 | 青岛鼎信通讯股份有限公司 | Broadband frequency response detection system and method for transformer characteristic analysis |
| CN112986883B (en) * | 2021-02-19 | 2022-08-16 | 云南电网有限责任公司昭通供电局 | Effectiveness testing system and method for transformer winding deformation detection device |
| CN114252805A (en) * | 2021-11-16 | 2022-03-29 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Wireless calibration equipment for transformer winding deformation |
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