CN201508411U

CN201508411U - On-line detection device with by-pass magnetic circuit for iron core bias magnet of transformer

Info

Publication number: CN201508411U
Application number: CN2009200700499U
Authority: CN
Inventors: 陈家新; 张桢阳; 毛立民; 陈革; 焦庆堂; 方建安
Original assignee: Donghua University
Current assignee: Donghua University
Priority date: 2009-04-08
Filing date: 2009-04-08
Publication date: 2010-06-16
Anticipated expiration: 2019-04-08

Abstract

The utility model relates to an on-line detection device with a by-pass magnetic circuit for iron core bias magnet of a transformer. The on-line detection device comprises the transformer, a Hall detection element and the by-pass magnetic circuit, wherein, the by-pass magnetic circuit with an airgap is additionally arranged on any outer side surface of a main magnetic circuit of the transformer; the Hall detection element is arranged in the airgap of the by-pass magnetic circuit, and a Hall element is utilized to detect the magnetic flux in the airgap; a sensor in the Hall detection element sends control signals, that is, the sensor sends the control signals to a Vcc pin of the Hall element, and the obtained airgap magnetic flux signals are converted to voltage signals that are then output to an Out pin; and the obtained signals are used for detecting the iron core bias magnet of the transformer and achieving the magnetic reset function. The on-line detection device has the advantages of high detection precision, high detection speed, strong universality and easy application.

Description

The transformer iron core magnetic bias on-line measuring device that has the bypass magnetic circuit

Technical field

The utility model belongs to power electronic converter applications technical field, particularly relates to a kind of transformer iron core magnetic bias on-line measuring device that has the bypass magnetic circuit.

Background technology

In the prior art, the typical method that solves transformer bias status detection and control magnetic reset has seven kinds: 1. be connected in series capacitive method; 2. iron core is opened the air gap method; 3. RC circuit voltage integration method; 4. auxiliary induction method; 5. armature supply slope detection method; 6. Pulse by Pulse detection method; 7. dicyclo detection method.Wherein, 1. 2. method only plays mitigation to the core sataration state, but can not fundamentally avoid.3. 4. method attempt to obtain the iron core exciting current by RC integrating circuit or auxiliary induction with indirect measurement method, but its measuring accuracy depends on the transformer distribution parameter, and especially distributed capacitance determines.And accurately determining of distributed Type Equivalent Circuit Model of high-frequency transformer and parameter thereof is theoretical, is still waiting further perfect.6. 5. method be based on when transformer core and take place when saturated, and the primary winding current increases significantly suddenly that these characteristics realize, and cause primary winding current to increase suddenly multiple factor is arranged, and strengthens suddenly as load etc.Therefore it should be noted that the possibility that this method exists mistake to know.Method in 5. mentioned mistake know problem, equally also be present in the Pulse by Pulse detection method 6. in.Therefore above-mentioned 5. 6. two kinds of methods can only be used for the design of particular transducer, can not be promoted, use as conventional method.7. method realizes that its shortcoming is mainly reflected in two aspects on indirect detection and control exciting current basis: the one, and to high-frequency transformer, the current relationship between each winding in the transformer is no longer observed the rule under the low-frequency operation pattern.Because in the exciting current of the high-frequency transformer of 7. measuring with method, in fact also comprised the electric current that flows through distributed capacitance.And the transformer magnetizing current of positive activation type transducer is less than 5% of total specified electric current, thereby measuring accuracy is vulnerable to flow through the current affects of distributed capacitance; The 2nd, along with the increase of the output way of transducer, its current detecting point also needs linear growth, and this causes the cost of manufacture of system and the analysis and the realization of system to be added to the difficulties.In addition, because the current sample point is to be distributed on each winding of transformer,, increased new difficulty to the design of safety and comprehensive, the processing of concrete signal.

Above-mentioned various technical scheme does not all directly relate to transformer fe cored structure magnetic circuit itself in essence, but realizes on the basis of employing indirect detection.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of core structure that has the bypass magnetic circuit, and this bypass magnetic circuit can be used for detecting the transformer iron core magnetic bias state.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of transformer iron core magnetic bias on-line measuring device that has the bypass magnetic circuit is provided, comprise transformer and hall detection component, it is characterized in that, described on-line measuring device also comprises: on any lateral surface of the main magnetic circuit of transformer, and additional bypass magnetic circuit that has air gap; Hall detection component is placed the air gap of bypass magnetic circuit, utilize Hall element that the magnetic flux in this air gap is detected; Sensor in the hall detection component imposes control signal, applies control signal promptly for Hall element Vcc pin, and the air-gap flux signal of gained is converted into voltage signal and exports the Out pin to; Detect signal and be used for the detection of transformer iron core magnetic bias and the realization of magnetic reset function.

Described transformer is EE type, EI type, EP type, EET type, EER type, R type, RM type, UU type, K type, OC type, BP type, PQ type, SA type, UU type.

This utility model principle is: because additional bypass magnetic circuit is to be attached on traditional high-frequency transformer core structure, the magnetic flux that therefore flows through additional bypass magnetic circuit exists certain quantitative corresponding relation with the magnetic flux that flows through transformer core.Thereby can utilize Hall element to detect to be attached to magnetic flux in the air gap in the bypass magnetic circuit, detect the state of transformer iron core magnetic bias.

Beneficial effect

Above-mentioned bypass magnetic circuit formula transformer fe cored structure is adopted in the utility model design, can directly measure the magnetic field running status of magnetic material itself, and check point has only one, irrelevant with the Transformer Winding number, add that this method intermediate treatment link is few, accuracy of detection height, detection speed are fast so this magnetic bias pick-up unit has, highly versatile, wieldy advantage.

Description of drawings

Fig. 1 a, Fig. 1 b, Fig. 1 c implement structural drawing based on the EE type transformer iron core magnetic bias state-detection of bypass magnetic circuit.

Wherein:

Fig. 1 a is a traditional E E type transformer fe cored structure; Fig. 1 b is the EE type transformer fe cored structure of band bypass magnetic circuit; Fig. 1 c implements illustration for the magnetic bias state-detection;

Fig. 2 is the magnetoelectricity schematic diagram based on the EE type transformer iron core magnetic bias condition checkout gear of bypass magnetic circuit.

Fig. 3 implements structural drawing based on the UU type transformer iron core magnetic bias state-detection of bypass magnetic circuit.

Fig. 3 a is traditional UU type transformer fe cored structure; Fig. 3 b is the UU type transformer fe cored structure of band bypass magnetic circuit; Fig. 3 c implements illustration for the magnetic bias state-detection;

Fig. 4 is the magnetoelectricity schematic diagram based on the UU type transformer iron core magnetic bias condition checkout gear of bypass magnetic circuit.

Fig. 5 implements structural drawing based on the PQ type transformer iron core magnetic bias state-detection of bypass magnetic circuit.

Fig. 5 a is a conventional P Q type transformer fe cored structure; Fig. 5 b is for installing band air gap bypass magnetic structure additional; Fig. 5 c implements illustration for the magnetic bias state-detection;

Fig. 6 implements structural drawing based on the RM type transformer iron core magnetic bias state-detection of bypass magnetic circuit.

Fig. 6 a is traditional RM type transformer fe cored structure; Fig. 6 b is for installing band air gap bypass magnetic structure additional; Fig. 6 c implements illustration for the magnetic bias state-detection;

Among the figure: 1. transformer fe cored structure; 2. bypass magnetic circuit; 3. detect air gap; 4. hall detection component; 5. winding coil.

Embodiment

Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiment only to be used to the utility model is described and be not used in the restriction scope of the present utility model.Should be understood that in addition those skilled in the art can make various changes or modifications the utility model after the content of having read the utility model instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

Align the excitation type converter transformer iron core magnetic bias, proposed a kind of core structure that has the bypass magnetic circuit that is used for detection of dynamic magnetic bias state.Based on such core structure, designed a kind of bypass magnetic circuit formula magnetic bias pick-up unit.

Below in conjunction with drawings and Examples the utility model being implemented main points is described in further detail.

Embodiment 1: based on the EE type transformer iron core magnetic bias condition checkout gear of bypass magnetic circuit, accompanying drawing 1, accompanying drawing 2 are this embodiment counter structure figure and schematic diagram.

One: design has the bypass magnetic circuit of air gap.Principle of design (shown in the accompanying drawing 2) satisfies

Following equation

Φm＝Φ1+Φ2………………………(1)

Φ2＝Φ3+Φ4………………………(2)

Can pass through the computing method calculated off-line, also can determine the quantitative relation of main magnetic circuit magnetic flux Φ m and bypass magnetic air gap magnetic flux Φ 4 by test method.

Two. (one) counts determined relation according to step, and traditional E E type transformer core structural type is transformed, and promptly installs band air gap bypass magnetic structure (shown in the accompanying drawing 1b) additional.

Three. be electrically connected in the enforcement, place Hall element in detecting air gap, the Vcc pin applies control signal (shown in the accompanying drawing 1c)

Four. the Hall element output signal is exported in the realization of transformer iron core magnetic bias status detection function by the Out pin.

Embodiment 2: based on the UU type transformer iron core magnetic bias condition checkout gear of bypass magnetic circuit, accompanying drawing 3, accompanying drawing 4 are to should example structure figure and schematic diagram

One. design has the bypass magnetic circuit of air gap.Principle of design (shown in the accompanying drawing 4) satisfies

Following equation

Φm＝Φ1…………………………(3)

Φ1＝Φ2+Φ3………………………(4)

Can pass through the computing method calculated off-line, also can determine the quantitative relation of main magnetic circuit magnetic flux Φ m and bypass magnetic air gap magnetic flux Φ 3 by test method.

Two. (one) counts determined relation according to step, and traditional E E type transformer core structural type is transformed, and promptly installs band air gap bypass magnetic structure (shown in the accompanying drawing 3b) additional.

Three. be electrically connected in the enforcement, place Hall element in detecting air gap, the Vcc pin applies control signal (shown in the accompanying drawing 3c).

Embodiment 3: based on the PQ type transformer iron core magnetic bias condition checkout gear of bypass magnetic circuit, this example structure figure (shown in the accompanying drawing 5).

One. design has the bypass magnetic circuit of air gap.Can pass through the computing method calculated off-line, also can determine the quantitative relation of main magnetic circuit magnetic flux and bypass magnetic air gap magnetic flux by test method.

Two. (one) counts determined relation according to step, and conventional P Q type transformer core structural type is transformed, and promptly installs band air gap bypass magnetic structure (shown in the accompanying drawing 5b) additional.

Three. be electrically connected in the enforcement, place Hall element in detecting air gap, the Vcc pin applies control signal (shown in the accompanying drawing 5c).

Embodiment 4: based on the RM type transformer iron core magnetic bias condition checkout gear of bypass magnetic circuit, this example structure figure (shown in the accompanying drawing 6).

Two. (one) counts determined relation according to step, and traditional RM type transformer core structural type is transformed, and promptly installs band air gap bypass magnetic structure (shown in the accompanying drawing 6b) additional.

Three. be electrically connected in the enforcement, place Hall element in detecting air gap, the Vcc pin applies control signal (shown in the accompanying drawing 6c).

Claims

1. transformer iron core magnetic bias on-line measuring device that has the bypass magnetic circuit, comprise transformer and hall detection component, it is characterized in that described on-line measuring device also comprises: on any lateral surface of the main magnetic circuit of transformer, additional bypass magnetic circuit that has air gap; Hall detection component is placed the air gap of bypass magnetic circuit, utilize Hall element that the magnetic flux in this air gap is detected; Sensor in the hall detection component imposes control signal, applies control signal promptly for Hall element Vcc pin, and the air-gap flux signal of gained is converted into voltage signal and exports the Out pin to.

2. a kind of transformer iron core magnetic bias on-line measuring device that has the bypass magnetic circuit according to claim 1 is characterized in that: described transformer is EE type, EI type, EP type, EET type, EER type, R type, RM type, UU type, K type, OC type, BP type, PQ type, SA type, UU type.