CN104714134B - Air reactor is integrated in the solution decoupling detecting method of transformator - Google Patents

Abstract

The present invention proposes a kind of air reactor and is integrated in the solution decoupling detecting method of transformator, can be integrated in transformator engineering design and the verification method of manufacture and detection as air reactor.Air reactor is integrated in transformator and uses nonopiate decoupling mode, the method that the present invention proposes is applicable to the decoupling test between each winding of transformator based on this nonopiate decoupling mode and each integrated hollow reactance winding, between each integrated hollow reactance winding, single test includes twice pressure test to a pair winding, it is thus achieved that two applying magnitudes of voltage and two open circuit inductive voltage values just can calculate the degree of coupling and decoupling degree.Without just obtaining decoupling degree in the case of calculating the mutual inductance value between two windings, this method of testing device is simple, and it is convenient to calculate, reliable results.

Description

Air reactor is integrated in the solution decoupling detecting method of transformator

Technical field

The present invention relates to a kind of air reactor and be integrated in the solution decoupling detecting method of transformator, belong to novel transformer technical field of performance test.

Background technology

Air reactor has inductance value good linearity, stable advantage, thus it is commonly applied to filtering field, but there is volume and take up an area bigger problem in it, the application that therefore equipment is taken up an area in restricted occasion by passive filtering system based on air reactor at ship's electrical propulsion system and urban distribution network box-type substation etc. is necessarily restricted.It is therefore proposed that air reactor is integrated in inside transformer, to realize reducing the purpose of space hold；

Air reactor is integrated in transformator, i.e. by special method for designing, air reactor winding is integrated in transformator, but, for ensureing the properly functioning of system, integrated reactor must be made operationally to be independent of each other with transformator, and the inductance value of the palpus integrated reactor of holding is constant, have good linearity to meet the tuning requirement of wave filter.Above-mentioned requirements to be met, it is necessary to realize the decoupling between integrated hollow reactor winding and the winding of transformator own；

Traditional decoupling mode is crossing decoupling, the most structurally keep the orthogonality relation of two winding magnetic circuits, so that there is not electromagnetic coupled relation between both, but this method can increase the volume of transformator itself, weight and cost, the application being unfavorable in engineering and popularization.Integrated hollow reactor winding involved in the present invention uses nonopiate decoupling mode, and actual decoupling effect is good and space hold is little, and integrated hollow reactor has the features such as inductance value is stable, the linearity is good.But, need a kind of practicality, easy solution decoupling detecting method using this air reactor based on nonopiate decoupling to be integrated in the design of transformator and manufacture process, to meet the index determining to product；

Engineering is generally used the degree of couplingkWeighing the coupling effect between winding, it represents two magnetic-coupled tightness degree of coil, is defined as.The degree of coupling is relevant with the coupling shape of winding, geometric position etc..

Summary of the invention

The present invention proposes a kind of air reactor and is integrated in the solution decoupling detecting method of transformator, its role is to: as air reactor integrated with transformator engineering design with verification method and the detection of manufacture；

Air reactor is integrated in transformator can realize the integrated of several air reactor winding, for ensureing working alone of transformator and integrated reactor, the decoupling between each integrated hollow reactor and transformator, between several integrated hollow reactor must be realized, therefore the test volume involved by this method of testing includes: the decoupling degree between each integrated hollow reactor winding and each winding of transformator, the degree of coupling between each integrated hollow reactor winding；

Method of testing for carrying out two groups of pressure tests to two windings.Step 1: first winding 1 is applied voltage, record the open circuit induced voltage on winding 2；Step 2: again winding 2 is applied voltage, record the open circuit induced voltage on winding 1.Then pass throughCalculate the degree of coupling, further computation decoupling degree；

The feature of this invention is: the method for testing described in employing, it is not necessary to test and calculate the self-induction of each test winding and mutual inductance value, it is only necessary to carries out two groups of pressure tests and just can obtain a result, has the advantages such as simple and quick.

Accompanying drawing explanation

Fig. 1 is to couple circuit diagram between a certain winding of transformator with single integrated hollow reactor winding；

Fig. 2 is the solution decoupling detecting method schematic diagram that air reactor is integrated in transformator；

Wherein, 1 is a certain winding of transformator, and 2 is single integrated hollow reactor winding, and 3 is transformer core, and 4 is alternating-current voltage source, and 5 is A.C. voltmeter.

Detailed description of the invention

Illustrate as a example by a certain winding of transformator and single integrated hollow reactor winding；

As it is shown in figure 1, set the port voltage of winding 1 asU ₁, the electric current of circulation isI ₁, inductance value isL ₁；The port voltage of winding 2 isU ₂, the electric current of circulation isI ₂, inductance value isL ₂；MFor the mutual inductance value between winding 1 and winding 2.Following equations can be obtained in the case of ignoring winding resistance:

(1)

Obtaining 4 magnitudes of voltage by following 2 steps just can computation decoupling degree；

Step 1: as shown in Figure 2 (a) shows, keeps winding 2 to open a way, winding 1 is applied voltage, measure the open circuit induced voltage on winding 2, can obtain according to formula (1):

(2)

Step 2: as shown in Fig. 2 (b), keeps winding 1 to open a way, winding 2 is applied voltage, measure the open circuit induced voltage on winding 1, can obtain according to formula (1):

(3)

In view of the degree of coupling formula between two windings it is

(4)

Formula (2), (3) are substituted into (4) and can obtain

(5)

And then the decoupling degree calculated between the two winding is

(6)

Test therefore it may only be necessary to the decoupling between two windings just can be realized by above-mentioned 2 steps.

Claims (1)

1. air reactor is integrated in a solution decoupling detecting method for transformator, makes air reactor be integrated in transformator and is capable of Several air reactor windings integrated, it is characterised in that this method of testing need not measure self-induction and mutual inductance value, it is only necessary to surveys Amount magnitude of voltage, just can calculate the degree of coupling and decoupling degree；Test volume involved by this method of testing includes: each integrated hollow reactance Decoupling degree between device winding and each winding of transformator, the degree of coupling between each integrated hollow reactor winding；

Winding a certain for transformator and single integrated air reactor winding, if the end of first winding in described two windings Mouth voltage is U₁, the electric current of circulation is I₁, inductance value is L₁；The port voltage of second winding in described two windings is U₂, The electric current of circulation is I₂, inductance value is L₂；M is the mutual inductance value between described first winding and described second winding；Ignoring Following voltage x current equation can be obtained in the case of winding resistance:

$\begin{array}{c}{U}_1=L_1\frac{{\mathrm{dI}}_1}{dt}+M\frac{{\mathrm{dI}}_2}{dt}\\ U_2=L_2\frac{{\mathrm{dI}}_2}{dt}+M\frac{{\mathrm{dI}}_1}{dt}\end{array}---\left(1\right)$

Obtain 4 magnitudes of voltage by following 2 steps and just can calculate the degree of coupling and decoupling degree；

Step 1: keep described second winding open circuit, first winding is applied voltage U₁', measure on described second winding Open circuit induced voltage U '₂, can obtain according to formula (1):

$\begin{array}{c}{U}_1^{\′}=L_1\frac{{\mathrm{dI}}_1^{\′}}{dt}\\ U_2^{\′}=M\frac{{\mathrm{dI}}_1^{\′}}{dt}\end{array}---\left(2\right)$

Step 2: keep first winding open circuit, described second winding is applied voltage U "₂, measure opening on first winding Road induced voltage U₁", can obtain according to formula (1):

$\begin{array}{c}{U}_1^{\′\′}=M\frac{{\mathrm{dI}}_2^{\′\′}}{dt}\\ U_2^{\′\′}=L_2\frac{{\mathrm{dI}}_2^{\′\′}}{dt}\end{array}---\left(3\right)$

In view of the degree of coupling formula between two windings it is:

$k_{cp}=\frac{M}{\sqrt{L_1{L}_2}}---\left(4\right)$

Formula (2), (3) substitution (4) can be obtained degree of coupling formula and are:

$k_{cp}=\sqrt{\frac{U_1^{\′\′}{U}_2^{\′}}{U_1^{\′}{U}_2^{\′\′}}}---\left(5\right)$

And then the decoupling degree calculated between the two winding is:

$k_{decp}=1-k_{cp}=1-\sqrt{\frac{U_1^{\′\′}{U}_2^{\′}}{U_1^{\′}{U}_2^{\′\′}}}---\left(6\right).$