CN205507053U - Measure device of transformer core BH curve and local loss - Google Patents

Abstract

The utility model relates to a measure device of transformer core BH curve and local loss, including can dismantling wooden anchor clamps and exciting coil and measuring coil, the rectangle that be four straight arms components unshakable in one's determination, its characterized in that the device still include post the local B measuring coil and the H measuring coil of a plurality of quantity on two adjacent straight arms unshakable in one's determination H measuring coil, on the iron core, correspond the position department of posting H measuring coil, twine local B measuring coil, then the coiling is on whole iron core side by side for exciting coil and measuring coil, and the iron core of good each coil of coiling is carried fixedly through dismantling wooden anchor clamps, does local B measuring coil adopt the line directly to be 0.1 0.3mm the enameled wire, closely coiling 10 25 the circle, H measuring coil adopts bilayer structure, use the line directly to be 0.03 0.06mm the coiling of self -adhesion enameled wire make on the epoxy resin board.

Description

Measuring transformer iron core BH curve and the device of Localized wear

Technical field

This utility model relates to power transformer technical field of electromagnetic measurement, is specifically related to a kind of measuring transformer iron core BH curve Device with Localized wear.

Background technology

Use during traditional measuring transformer iron core BH curve be equivalent magnetic circuit method, the method is to use formula HL=Ni (L is transformer core equivalent magnetic circuit length, and N is the number of turn of magnetizing coil, and i is exciting current) by measure exciting current, Obtain H curve.Equivalent magnetic circuit length L in this method typically takes geometric average length or uses double core model method to come really Fixed.But, first magnetic field intensity H is being not equally distributed along magnetic circuit direction, and in the Distribution of Magnetic Field of turning lap-joint More complicated can not simply use geometric method.Double core model methods take into account the magnetic field of turning lap-joint, but in iron yoke The magnetic field at place is not equally distributed, and needs two models, operates more complicated.Further, unshakable in one's determination under difference encourages and Under different overlapping modes, the equivalence length of magnetic path is different.So, tradition equivalent magnetic circuit method measuring transformer iron core BH curve It is coarse.And traditional equivalent magnetic circuit measuring method can only obtain total losses, it is impossible to obtain the Localized wear of iron core.

According to existing pertinent literature, the measurement to transformer core is all the traditional magnetic equivalent circuit method used, and measurement apparatus is only to use Excitation coil and measuring coil are wrapped on four arms unshakable in one's determination, then use fixture to fix, and this device can only use equivalent magnetic circuit Method measures BH curve, can only measure total losses, can not measure the loss of local, additionally, coil is directly twined by original device It is wound on iron core, needs to rewind coil when measuring new iron core, in-convenience in use.

Utility model content

Compared with prior art, the technical problem that this utility model intends to solve is to provide a kind of measuring transformer iron core BH curve Device and method with Localized wear.This device adds local B measuring coil and H measuring coil in original measurement apparatus, makes Directly gather the measurement signal of magnetic density B and magnetic field intensity H with signal picker, need not consider that equivalent magnetic circuit length just can be counted Calculating the BH curve obtaining iron core, local B and H that measurement obtains passes through and calculates the loss that i.e. can obtain this regional area, and Add resin material support in conventional apparatus, be convenient for changing the iron core of different materials and structure.The method need not calculate equivalent magnetic Road length, can relatively precisely measuring transformer BH curve under difference encourages and under different overlapping modes unshakable in one's determination and local Loss.

This utility model solves described method and technology problem and employed technical scheme comprise that, it is provided that a kind of measuring transformer iron core BH is bent Line and the device of Localized wear, including detachable wooden fixture and excitation coil and measuring coil, iron core is that four straight-arms are constituted Rectangle, it is characterised in that this device also includes a number of local B measuring coil and H measuring coil, at two adjacent ferrum Posting described H measuring coil on heart straight-arm, on iron core, correspondence posts the position of H measuring coil, is wound around local B Measuring coil；Then, excitation coil and measuring coil are wound on whole iron core side by side, and passing through around the iron core making each coil can Dismantle wooden fixture and clamp fixing；Described local B measuring coil uses line footpath to be the enamel-covered wire of 0.1-0.3mm, tight coiling 10-25 circle；H measuring coil uses double-decker, is wound on epoxy resin with the self-adhesive enameled wire that line footpath is 0.03-0.06mm Make on substrate.

A kind of measuring transformer iron core BH curve and the method for Localized wear, use said apparatus, comprise the following steps:

1. BH curve unshakable in one's determination is measured

Choosing one group of local B measuring coil and H measuring coil, connect signal picker respectively, excitation coil connects power supply, signal Harvester directly gathers one group of local B measuring coil and the induced voltage signal of H measuring coil, by this induced voltage signal It is integrated calculating according to formula (3) and formula (4), obtains the B curve in iron core and H curve, the ferrum of correspondence can be drawn out Heart BH curve；

$H=\frac{1}{{\mathrm{\μ}}_0{N}_H{S}_H}\∫U_{H}dt---\left(3\right)$

$B=\frac{1}{N_B{S}_B}\∫U_{B}dt---\left(4\right)$

Wherein, μ₀Be permeability of vacuum value be 4 π × 10^-7(H/m), N_HIt is the number of turn of H measuring coil, N_BIt is that local B surveys The number of turn of amount coil, S_HIt is the sectional area of H measuring coil, S_BIt it is sectional area unshakable in one's determination；

2. Localized wear is measured

Unshakable in one's determination two adjacent straight-arms are carried out region division according to H measuring coil position, obtain some straight-arm zonules and Corner region, and straight-arm zonule is numbered, straight-arm zonule is used local homogenization method calculating magnetic field intensity H, Measure the BH curve obtaining center, straight-arm zonule, according to poynting's theorem, be calculated the ratio in straight-arm zonule unshakable in one's determination total Loss is:

$P_s=\frac{1}{{\mathrm{T\ρ}}_m}{\∫}_0^{T}HdB---\left(5\right)$

Wherein Ps is total Loss Ratio unshakable in one's determination, and the material properties needing to obtain measured by magnetic material；ρ_mBeing density unshakable in one's determination, T is one The time in individual cycle, H and B is magnetic field intensity and the magnetic density of corresponding region；

A. the loss calculating Localized wear iron core straight-arm zonule, straight-arm zonule is:

$P_N=S_N{L}_N{\mathrm{\ρ}}_m{P}_{S_N}---\left(6\right)$

Wherein N is the numbering of straight-arm zonule unshakable in one's determination, P_NBeing the loss of straight-arm zonule unshakable in one's determination, S is the effective of straight-arm zonule unshakable in one's determination Sectional area, P_SNIt is the total Loss Ratio of n-th zonule, formula (5) is calculated, L_NIt is the length of n-th zonule；

B. calculate total losses and measure exciting current I by power analyzer₁With measurement voltage U₂, always damaged according to formula (7) Consumption P,

P=I₁U₂(7)；

C. corner region loss is calculated

Magnetic flux on adjacent two straight-arms of winding local B measuring coil and two other straight-arm is symmetrical, the magnetic at four turnings Reduction of fractions to a common denominator cloth is identical, can try to achieve single corner region according to formula (8) and be lost:

$P_C=\frac{P-2(P_1+P_2+...+P_N)}{4}---\left(8\right)$

Wherein P_CIt is the corner region loss of single corner, P₁+P₂+…+P_NIt is the total of Localized wear on two straight-arm zonules With.

Compared with prior art, the beneficial effects of the utility model are:

This utility model device adds local B measuring coil and H measuring coil on typical measuring arrangements, need not consider equivalent magnetic The impact of road length, can more directly obtain the BH curve under difference excitation and bridging arrangement unshakable in one's determination, than traditional equivalence Magnetic Circuit Method more directly, more accurate.And this utility model adds insulating support on typical measuring arrangements, it is convenient for changing different material Material and the iron core of structure, it is not necessary to rewind coil.And traditional measurement apparatus and method can not measure the local of iron core Loss, this utility model device and method can measure the Localized wear of iron core easily.

Accompanying drawing explanation

Fig. 1 is that the stereochemical structure of a kind of embodiment of device of this utility model measuring transformer iron core BH curve and Localized wear is shown It is intended to.

Fig. 2 is the H measuring coil of a kind of embodiment of device of this utility model measuring transformer iron core BH curve and Localized wear The structural representation being wrapped on iron core with local B measuring coil.

Fig. 3 is the H measuring coil of a kind of embodiment of device of this utility model measuring transformer iron core BH curve and Localized wear The structural representation of 6.

Fig. 4 is that the device of this utility model measuring transformer iron core BH curve and Localized wear does not installs detachable wooden fixture Cross-sectional structure schematic diagram.

Fig. 5 is the schematic diagram of the measurement device Localized wear of this utility model measuring transformer iron core BH curve and Localized wear.

In figure: the detachable wooden fixture of 1-, 2-excitation coil and measuring coil, 3-support, 4-are unshakable in one's determination, 5-local B measuring coil, 6-H measuring coil.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing, principle of the present utility model and feature are described, but not in this, as to the application The restriction of claims.

Including can for the device (being called for short device, see Fig. 1-4) of this utility model measuring transformer iron core BH curve and Localized wear Dismantling wooden fixture 1 and excitation coil and measuring coil 2, iron core is the rectangle that four straight-arms are constituted, it is characterised in that this device Also include a number of local B measuring coil 5 and H measuring coil 6, two adjacent straight-arms unshakable in one's determination post described H measuring coil 6, on unshakable in one's determination 4, correspondence posts the position of H measuring coil, is wound around local B measuring coil 5 and (sees Fig. 2)；Then, excitation coil and measuring coil 2 are wound on whole unshakable in one's determination 4 side by side, lead to around the iron core 4 making each coil Cross detachable wooden fixture 1 and clamp fixing；The enamel-covered wire that described local B measuring coil 5 uses line footpath to be 0.1-0.3mm, tightly Close coiling 10-25 circle；H measuring coil 6 (seeing Fig. 3) uses double-decker, with the self-adhesion paint that line footpath is 0.03-0.06mm Envelope curve is wound on epoxy resin base plate and makes.

Of the present utility model it be further characterized by described device and also include that support 3, described support 3 are made up of insulant, horizontal Cross section is rectangle, and the geomery of support matches with the geomery of iron core 4, and the iron core 4 posting H measuring coil 6 inserts In support 3, excitation coil and measuring coil 2 are the most uniformly wound on the outer surface of support 3 and (see Fig. 4), locally B Measuring coil 5 is wound on support and is positioned at excitation coil and the inside of measuring coil 2.

H measuring coil 6 is all posted on four straight-arms being further characterized by iron core of the present utility model.

During the measurement device of this utility model measuring transformer iron core BH curve and Localized wear, according to above-mentioned annexation even Connection device, then connects excitation power supply by excitation coil, and power analyzer connects excitation coil and measuring coil, and signal picker is even Connect H measuring coil 6 and local B measuring coil 5.Because this utility model device is respectively arranged with H at adjacent two straight-arms unshakable in one's determination Measuring coil 6 and local B measuring coil 5, thus right to stepping bridging arrangement, U-shaped bridging arrangement, L-type bridging arrangement etc. Structure is claimed to be all suitable for.Unsymmetric structure can all add measuring coil on four straight-arms, on two adjacent straight-arms that this device uses Add measuring coil and be suitable for major part bridging arrangement.

This utility model measuring transformer iron core BH curve and the method for Localized wear, use said apparatus, comprise the following steps:

1. BH curve unshakable in one's determination is measured

Choosing one group of local B measuring coil 5 and H measuring coil 6, connect signal picker respectively, excitation coil connects power supply, Signal picker directly gathers one group of local B measuring coil and the induced voltage signal of H measuring coil, by this induced voltage Signal is integrated calculating according to formula (3) and formula (4), obtains the B curve in iron core and H curve, can draw out correspondence BH curve unshakable in one's determination；

$H=\frac{1}{{\mathrm{\μ}}_0{N}_H{S}_H}\∫U_{H}dt---\left(3\right)$

$B=\frac{1}{N_B{S}_B}\∫U_{B}dt---\left(4\right)$

Wherein, μ₀Be permeability of vacuum value be 4 π × 10^-7(H/m), N_HIt is the number of turn of H measuring coil, N_BIt is that local B surveys The number of turn of amount coil, S_HIt is the sectional area of H measuring coil, S_BIt it is sectional area unshakable in one's determination；

2. Localized wear is measured

Unshakable in one's determination two adjacent straight-arms are carried out region division according to H measuring coil position, obtain some straight-arm zonules and Corner region, and straight-arm zonule is numbered, straight-arm zonule is used local homogenization method calculating magnetic field intensity H, Measure the BH curve obtaining center, straight-arm zonule, according to poynting's theorem, be calculated the ratio in straight-arm zonule unshakable in one's determination total Loss is:

$P_s=\frac{1}{{\mathrm{T\ρ}}_m}{\∫}_0^{T}HdB---\left(5\right)$

Wherein Ps is total Loss Ratio unshakable in one's determination, and the material properties needing to obtain measured by magnetic material；ρ_mBeing density unshakable in one's determination, T is one The time in individual cycle, H and B is magnetic field intensity and the magnetic density of corresponding region；

A. the loss calculating Localized wear iron core straight-arm zonule, straight-arm zonule is:

$P_N=S_N{L}_N{\mathrm{\ρ}}_m{P}_{S_N}---\left(6\right)$

Wherein N is the numbering of straight-arm zonule unshakable in one's determination, P_NBeing the loss of straight-arm zonule unshakable in one's determination, S is the effective of straight-arm zonule unshakable in one's determination Sectional area, P_SNIt is the total Loss Ratio of n-th zonule, formula (5) is calculated, L_NIt is the length of n-th zonule；

B. calculate total losses and measure exciting current I by power analyzer₁With measurement voltage U₂, always damaged according to formula (7) Consumption P,

P=I₁U₂(7)；

C. corner region loss is calculated

Magnetic flux on adjacent two straight-arms of winding local B measuring coil and two other straight-arm is symmetrical, the magnetic at four turnings Reduction of fractions to a common denominator cloth is identical, can try to achieve single corner region according to formula (8) and be lost:

$P_C=\frac{P-2(P_1+P_2+...+P_N)}{4}---\left(8\right)$

Wherein P_CIt is the corner region loss of single corner, P₁+P₂+…+P_NIt is the total of Localized wear on two straight-arm zonules With.

Embodiment 1

The device of the present embodiment measuring transformer iron core BH curve and Localized wear include detachable wooden fixture 1, excitation coil and Measuring coil 2, support 3, a number of local B measuring coil 5 and H measuring coil 6, iron core is that four straight-arms are constituted Rectangle, two adjacent straight-arms unshakable in one's determination post described H measuring coil 6, described support 3 is made up of insulant, Cross section is rectangle, and the geomery of support matches with the geomery of iron core 4, and the iron core 4 posting H measuring coil 6 is inserted Entering in support 3, excitation coil and measuring coil 2 are the most uniformly wound on the outer surface of support 3, locally B measuring coil 5 Being wound on support and be positioned at excitation coil and the inside of measuring coil 2, the position of corresponding H measuring coil 6, around making each line Iron core 4 and the support of circle are clamped fixing by detachable wooden fixture 1.Described local B measuring coil 5 uses line footpath to be 0.2mm Enamel-covered wire, tight coiling 10 circle, the position of B measuring coil, local and the number of turn can be adjusted according to required；H measuring coil 6 Use double-decker, be wound on 1mm epoxy resin base plate with the self-adhesive enameled wire that line footpath is 0.05mm and make, every layer 200 Circle, totally 400 circle, upper and lower two-layer comes and goes intersection can eliminate the interference of line m-Acetyl chlorophosphonazo, improves certainty of measurement.Described support 2 interior Portion's width is 102mm, and height is 22mm, and thickness is 2mm.

The present embodiment measuring transformer iron core BH curve and the method for Localized wear, use said apparatus, comprise the following steps:

1. BH curve unshakable in one's determination is measured

Choosing one group of local B measuring coil 5 and H measuring coil 6, connect signal picker respectively, excitation coil connects power supply, Signal picker directly gathers one group of local B measuring coil and the induced voltage signal of H measuring coil, according to Faradic electricity magnetic strength Answer law, H measuring coil and local B measuring coil induction electromotive force U in magnetic field_HAnd U_BIt is expressed as:

$U_H=-{\mathrm{\μ}}_0{N}_H{S}_H\frac{dH}{dt}---\left(1\right)$

$U_B=-N_B{S}_B\frac{dB}{dt}---\left(2\right)$

Wherein μ₀Be permeability of vacuum value be 4 π × 10^-7(H/m), N_HIt is the number of turn of H coil, N_BIt is the number of turn of B coil, S_HIt is the sectional area of H coil, S_BIt it is sectional area unshakable in one's determination.

Then according to formula (3) and formula (4) are integrated calculating, obtain the B curve in iron core and H curve, can draw out Corresponding BH curve unshakable in one's determination；

$H=\frac{1}{{\mathrm{\μ}}_0{N}_H{S}_H}\∫U_{H}dt---\left(3\right)$

$B=\frac{1}{N_B{S}_B}\∫U_{B}dt---\left(4\right)$

Wherein, μ₀Be permeability of vacuum value be 4 π × 10^-7(H/m), N_HIt is the number of turn of H measuring coil, N_BIt is that local B surveys The number of turn of amount coil, S_HIt is the sectional area of H measuring coil, S_BIt it is sectional area unshakable in one's determination；

2. Localized wear is measured

Two adjacent for iron core straight-arms are carried out region division according to H measuring coil position, as shown in Figure 4, surveys according to H Iron core two arms is divided into ten regions by the position of amount coil and local B measuring coil.Obtain eight straight-arm zonules and two turn Angular zone, and straight-arm zonule is numbered, straight-arm zonule is used local homogenization method calculating magnetic field intensity H, surveys Measure the BH curve at center, straight-arm zonule, because the main flux of arm unshakable in one's determination is unidirectional in a model, so according to ripple Print court of a feudal ruler theorem, being calculated the total Loss Ratio in straight-arm zonule unshakable in one's determination is:

$P_s=\frac{1}{{\mathrm{T\ρ}}_m}{\∫}_0^{T}HdB---\left(5\right)$

Wherein Ps is total Loss Ratio unshakable in one's determination, and the material properties needing to obtain measured by magnetic material；ρ_mBeing density unshakable in one's determination, T is one The time in individual cycle, H and B is magnetic field intensity and the magnetic density of corresponding region；

A. the loss calculating Localized wear iron core straight-arm zonule, straight-arm zonule is:

$P_N=S_N{L}_N{\mathrm{\ρ}}_m{P}_{S_N}---\left(6\right)$

Wherein N is the numbering of straight-arm zonule unshakable in one's determination, P_NBeing the loss of straight-arm zonule unshakable in one's determination, S is the effective of straight-arm zonule unshakable in one's determination Sectional area, P_SNIt is the total Loss Ratio of n-th zonule, formula (5) is calculated, L_NIt is the length of n-th zonule；

B. calculate total losses and measure exciting current I by power analyzer₁With measurement voltage U₂, always damaged according to formula (7) Consumption P,

P=I₁U₂(7)；

C. corner region loss is calculated

Because the magnetic flux of corner unshakable in one's determination is not unidirectional, but rotating magnetic flux and skewness, calculate more complicated, So the loss subtracted on straight-arm by total losses is tried to achieve.

Magnetic flux on adjacent two straight-arms of winding local B measuring coil and two other straight-arm is symmetrical, the magnetic at four turnings Reduction of fractions to a common denominator cloth is identical, can try to achieve single corner region according to formula (8) and be lost:

$P_C=\frac{P-2(P_1+P_2+...+P_N)}{4}---\left(8\right)$

Wherein P_CIt is the corner region loss of single corner, P₁+P₂+…+P_NIt is the total of Localized wear on two straight-arm zonules With.

This utility model is not addressed part and is applicable to prior art.

Claims (3)

1. measuring transformer iron core BH curve and a device for Localized wear, including detachable wooden fixture and excitation coil and survey Amount coil, iron core is the rectangle that four straight-arms are constituted, it is characterised in that this device also includes a number of local B measuring coil And H measuring coil, two adjacent straight-arms unshakable in one's determination post described H measuring coil, on iron core, correspondence posts H The position of measuring coil, is wound around local B measuring coil；Then, excitation coil and measuring coil are wound on whole iron core side by side On, clamp fixing around the iron core making each coil by detachable wooden fixture；B measuring coil employing line footpath, described local is The enamel-covered wire of 0.1-0.3mm, tight coiling 10-25 circle；H measuring coil uses double-decker, is 0.03-0.06mm with line footpath Self-adhesive enameled wire be wound on epoxy resin base plate and make.

Measuring transformer iron core BH curve the most according to claim 1 and the device of Localized wear, it is characterised in that described dress Putting and also include support, described support is made up of insulant, and cross section is rectangle, the geomery of support and shape chi unshakable in one's determination Very little matching, post the unshakable in one's determination of H measuring coil and insert in support, excitation coil and measuring coil are the most uniformly wound on support On outer surface, locally B measuring coil is wound on support and is positioned at the inside of excitation coil and measuring coil.

Measuring transformer iron core BH curve the most according to claim 1 and the device of Localized wear, it is characterised in that unshakable in one's determination Article four, straight-arm all posts H measuring coil.