CN209656788U - A kind of reactor inductance value test device - Google Patents
A kind of reactor inductance value test device Download PDFInfo
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- CN209656788U CN209656788U CN201920215712.3U CN201920215712U CN209656788U CN 209656788 U CN209656788 U CN 209656788U CN 201920215712 U CN201920215712 U CN 201920215712U CN 209656788 U CN209656788 U CN 209656788U
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- reactor
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- control borad
- inductance value
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Abstract
The utility model relates to power equipment measuring device technical fields, especially a kind of reactor inductance value test device, including breaker, fuse, contactor, electric voltage regulator, HF current transformer, master control borad, liquid crystal touch screen, the connection of the input terminal of three-phase 380V power supply and breaker, the breaker successively with fuse, contactor, electric voltage regulator and the series connection of tested reactor, HF current transformer is arranged between electric voltage regulator and tested reactor, the current signal of measurement is inputted into master control borad, the master control borad is connect with liquid crystal touch screen by RS485 communication cable.A kind of obtained reactor inductance value test device of the utility model, have the advantage that 1. tested reactors by actual motion in 0.8-2 times of rated current come the inductance value of testing product, to carry out testing product performance closest to product actual condition.2. tested reactor calculates inductance value using voltage-to-current method, measurement is more accurate, and error is smaller.
Description
Technical field
The utility model relates to power equipment measuring device technical field, especially a kind of reactor inductance value test device.
Background technique
The current-limiting reactor of tuning type reactive power compensator, magnet controlled reactor, reactance in high-power electric and electronic current transformer
The large power reactors such as device are higher to the inductance value required precision of reactor in process of production.Currently on the market for small-power
The special inductive measuring instrumentss of inductance (reactor) generally use bridge method, the resonance method, digitized measurement method.Regardless of
Test method, when measuring inductance, most instrument are only 50mV~2V, electric current to the test signal voltage of inductance
10mA~50mA, the magnetic field strength very little (in most cases only in the initial permeability stage) of excitation, the inductance value obtained will
Application condition is big, moreover, the usual detection project of such product is single, is not able to satisfy to the large power reactor linearity, temperature rise etc.
The detection of performance.When bridge method (AC bridge) measures large power reactor inductance value, only the input voltage of reactor
For ideal power-frequency voltage, electric current is also ideal power current, has ignored the presence of harmonic voltage, and the variation of mains frequency causes
It is larger to measure inductance value measurement error.Therefore, for large power reactor during the manufacturing, one can be in 0.8~2In of reactor
In current range, quickly, accurately the device of detection reactor inductance value is just even more important.
Utility model content
A kind of reactor inductance value test device is provided purpose of the utility model is to solve the deficiency of above-mentioned technology,
Quickly, reactor inductance value can be accurately detected in 0.8~2In current range.
In order to achieve the above object, a kind of reactor inductance value test device designed by the utility model, including breaker,
Fuse, contactor, electric voltage regulator, HF current transformer, master control borad, liquid crystal touch screen, three-phase 380V power supply and open circuit
The input terminal of device connects, and the breaker is successively connected with fuse, contactor, electric voltage regulator and tested reactor, high frequency
Current transformer is arranged between electric voltage regulator and tested reactor, and the input current for measuring tested reactor, and
The current signal of measurement is inputted into master control borad, master control borad calculates current signal, and the master control borad and liquid crystal touch screen are logical
Cross the connection of RS485 communication cable；Master control borad is electrically connected with contactor, electric voltage regulator, master control borad control contactor and electric adjustable
Depressor movement.
Master control borad includes three-phase voltage input interface, three-phase current input interface, voltage signal adjustment circuit, current signal
The current signal of adjustment circuit and controller, HF current transformer measurement is sent into control after overcurrent signal adjustment circuit
Device.
Wherein HF current transformer measures the input current of tested reactor, and control is sent after current signal adjustment circuit
Device；Liquid crystal touch screen and master control borad are connected using RS485 communication cable.Measurement Algorithm is based on voltage-to-current methodIt is right
When AC reactor applies alternating current, the voltage drop of electric current and winding both ends between winding, which comes true, to be compared, and detects the voltage of winding
It drops, wherein the inductive reactance xl of reactor=2 π fL=ω L.The liquid crystal touch screen sets the In electric current of tested reactor, master control borad
After control contactor is attracted, then controls electric voltage regulator output voltage and gradually risen from 0V and reach tested reactor 2In electric current, it is main
Control the voltage and current that plate is tested reactor with 12 1024 point samplings of AD each cycle.To the fundamental wave width of reactor voltage and electric current
The measurement of value is analyzed, and is realized using quick DFT.(the electric power organization prescribed power frequency component frequency fluctuation as frequency departure 50Hz
Range: 49.75HZ -50.25HZ), the fence effect and leakage phenomenon of DFT algorithm will will lead to the measurement accuracy of electric current, voltage
It is difficult to meet actual demand.Since general power network signal mainly contains integral frequency harmonizing wave, thus frequently with the group based on Cosine Window
Window is closed, as long as this kind of window chooses the integral multiple that observation time is the signal period, frequency spectrum width at each secondary integer harmonics frequency
Value is zero, thus does not occur mutually to leak between harmonic wave.Master control borad can calculate each harmonic voltage of tested reactor
Number and amplitude, the number and amplitude of individual harmonic current.According to voltage-to-current method, tested reactor is calculated in fundamental wave, each
The inductance value of subharmonic.Tested reactor by actual motion in 0.8-2 times of rated current come the inductance value of testing product, that is, measure
Value is dynamic inductance, the Static Electro inductance value measured by general instrument is corrected with this, to detect closest to product actual condition
Properties of product.
A kind of obtained reactor inductance value test device of the utility model, has the advantage that
1. tested reactor is by actual motion in 0.8-2 times of rated current come the inductance value of testing product, i.e. measured value
For dynamic inductance, the Static Electro inductance value measured by general instrument is corrected with this, is produced with being detected closest to product actual condition
Moral character energy.
2. tested reactor calculates inductance value using voltage-to-current method, tested reactor is calculated in fundamental wave, each by DFT
Inductance value under subharmonic, measurement is more accurate, and error is smaller.
Detailed description of the invention
Fig. 1 is the electronic schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram of the master control borad of the utility model.(being wherein used as controller after AD and CPU combination)
Specific embodiment
Below by embodiment combination attached drawing, the utility model will be further described.
Embodiment 1:
As shown in Figure 1, a kind of reactor inductance value test device of the present embodiment description, including breaker 1, fuse 2, connect
Tentaculum 3, electric voltage regulator 4, HF current transformer 5, master control borad 7, liquid crystal touch screen 8, three-phase 380V power supply and breaker 1
Input terminal connection, the breaker 1 are successively connected with fuse 2, contactor 3, electric voltage regulator 4 and tested reactor 6, high frequency
Current transformer 5 is arranged between electric voltage regulator 4 and tested reactor 6, and the input electricity for measuring tested reactor 6
Stream, and the current signal of measurement is inputted into master control borad 7, master control borad 7 calculates current signal, the master control borad 7 and liquid crystal
Touch screen 8 is connected by RS485 communication cable；Master control borad 7 is electrically connected with contactor 3, electric voltage regulator 4, and the control of master control borad 7 connects
Tentaculum 3 and electric voltage regulator 4 act.
As shown in Fig. 2, master control borad 7 includes three-phase voltage input interface, three-phase current input interface, voltage signal adjustment electricity
Road, current signal adjustment circuit and controller, the current signal that HF current transformer 5 measures is through overcurrent signal adjustment circuit
After be sent into controller.
Measurement Algorithm is based on voltage-to-current methodElectric current when applying alternating current to AC reactor, between winding
Voltage drop with winding both ends, which comes true, to be compared, and detects the voltage drop of winding, wherein the inductive reactance xl of reactor=2 π fL=ω L.Institute
The In electric current that liquid crystal touch screen sets tested reactor is stated, after master control borad control contactor is attracted, then to control electric voltage regulator defeated
Voltage gradually rises from 0V out reaches tested reactor 2In electric current, and master control borad is with the tested electricity of 12 1024 point samplings of AD each cycle
The voltage and current of anti-device.The electric quantity signal of tested reactor is indicated x (t)=x (t+KT) with a cycle function, in formula
T is the period, and k is rounded numerical value,F is the frequency of electric systemIt is the angular frequency of system；It can use Fourier
Leaf series expansion at:
Wherein, A0 is DC component；N is the number of harmonic wave, in actual measurement process, to voltage and current signal one
If each synchronized sampling at equal intervals is done in a period, the discrete time-domain data of acquisition are subjected to Fast Fourier Transform (FFT) (FFT), are obtained
To the frequency domain data of signal, amplitude, phase, power and percent harmonic distortion of fundamental wave and each harmonic etc. can be calculated.To electricity
Pressure or the general step of electric current x (t) sampling are: then selected a cycle is again selected corresponding N number of period N equal part
Along ent, that is, voltage or current signal are subjected to discretization, obtain one group of sample sequence { xk, k=1,2 ..., N kth
A sampling instant is tk=KT/N can find out the coefficient An, Bn of n-th harmonic:
, wherein n=1,2,3 ... ..., N are translated into discrete value.
ByIt can be easy to acquire:
The measurement accuracy that will lead to electric current, voltage is difficult to meet practical need by the fence effect and leakage phenomenon of DFT algorithm
It asks.Since general power network signal mainly contains integral frequency harmonizing wave, thus frequently with the composite window based on Cosine Window, as long as this kind of window
The integral multiple that observation time is the signal period is chosen, frequency spectrum amplitude at each secondary integer harmonics frequency is zero, thus harmonic wave
Between do not occur mutually to leak, to the sample sequence application DFT after this plus hamming window go forward side by side row interpolation algorithm can be obtained amplitude and
Phase.
Claims (2)
1. a kind of reactor inductance value test device, it is characterized in that: including breaker, fuse, contactor, electric voltage regulator, height
The input terminal of frequency current transformer, master control borad, liquid crystal touch screen, three-phase 380V power supply and breaker connects, the breaker according to
It is secondary to connect with fuse, contactor, electric voltage regulator and tested reactor, HF current transformer setting electric voltage regulator with
Between tested reactor, and the input current for measuring tested reactor, and the current signal of measurement is inputted into master control borad, it is main
Control plate calculates current signal, and the master control borad is connect with liquid crystal touch screen by RS485 communication cable；Master control borad with connect
Tentaculum, electric voltage regulator electrical connection, master control borad control contactor and electric voltage regulator movement.
2. a kind of reactor inductance value test device according to claim 1, it is characterized in that: master control borad includes that three-phase voltage is defeated
Incoming interface, three-phase current input interface, voltage signal adjustment circuit, current signal adjustment circuit and controller, high-frequency current are mutual
The current signal of sensor measurement is sent into controller after overcurrent signal adjustment circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920215712.3U CN209656788U (en) | 2019-02-20 | 2019-02-20 | A kind of reactor inductance value test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920215712.3U CN209656788U (en) | 2019-02-20 | 2019-02-20 | A kind of reactor inductance value test device |
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| CN209656788U true CN209656788U (en) | 2019-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200225A (en) * | 2021-11-12 | 2022-03-18 | 辽宁芯峻电气有限公司 | Cabinet type dry hollow current-limiting reactor test method |
-
2019
- 2019-02-20 CN CN201920215712.3U patent/CN209656788U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200225A (en) * | 2021-11-12 | 2022-03-18 | 辽宁芯峻电气有限公司 | Cabinet type dry hollow current-limiting reactor test method |
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