CN111430136A - Load self-diagnosis protection device for dry-type transformer - Google Patents

Abstract

The invention discloses a load self-diagnosis protection device of a dry type transformer, which comprises a transformer main body, wherein an iron core and a winding wound on the iron core are arranged in the transformer main body, and the self-diagnosis protection device also comprises a normally closed temperature switch and an alternating current contactor. The normally closed temperature switch is provided with a temperature sensor and a winding which is connected in series with the temperature sensor. The alternating current contactor is connected in series with an input control end or an output control end of the winding and is electrically connected with the normally closed temperature switch, the normally open/normally closed conversion of the normally closed temperature switch is used as a signal given medium of the alternating current contactor, the temperature of the winding is further monitored in real time, and a detection circuit detects the abnormity of the signal and directly controls the on-off of the alternating current contactor. The self-diagnosis protection device can self-diagnose whether the transformer has overhigh operation temperature or overlarge load, thereby carrying out input side or output side disconnection power supply by taking self protection and rear end power utilization protection as the purposes.

Description

Load self-diagnosis protection device for dry-type transformer

Technical Field

The invention relates to the technical field of dry-type transformers, in particular to a load self-diagnosis protection device of a dry-type transformer.

Background

At present, dry-type transformers without external protection control used in a plurality of industries such as automatic control, intelligent mechanical equipment, low-voltage power distribution and the like all belong to uncontrolled power supply.

The main frequency low voltage dry type transformer is divided into a self-coupling dry type transformer and an isolation dry type transformer according to the electromagnetic coupling principle. The electric power supply structure is divided into a single-phase dry type transformer and a three-phase dry type transformer. The self-coupling dry type transformer, the isolation dry type transformer, the single-phase dry type transformer and the three-phase dry type transformer are all composed of coil windings and silicon rigid magnets.

The uncontrolled application of the dry-type transformer has a great risk, and generally, the voltage of the power supply input side deviates from the rated input voltage level or the load side is longer than the capacity of the transformer, so that the transformer is damaged more frequently, and more seriously, the equipment at the back end of the load is damaged and abnormal.

Therefore, it is necessary to provide a protection device on the dry-type transformer to solve the above-mentioned technical problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a dry-type transformer load self-diagnosis protection device, which is designed to solve the hidden trouble caused by the fact that the electricity environment and the electricity quality are changed by human factors or non-human factors in the use process of a transformer.

In order to solve the technical problem, the invention is realized by the following scheme: the invention relates to a load self-diagnosis protection device of a dry-type transformer, which comprises a transformer main body, wherein an iron core and a winding wound on the iron core are arranged in the transformer main body, and the self-diagnosis protection device also comprises:

the reset type normally closed temperature switch is arranged on the transformer main body, a temperature sensor is arranged on the reset type normally closed temperature switch, and the normally closed temperature switch is connected with the winding in series;

and the external alternating current contactor is connected in series with the input control end or the output control end of the winding and is electrically connected with the normally closed temperature switch, the normally open/normally closed conversion of the normally closed temperature switch is used as a signal given medium of the alternating current contactor, the temperature of the winding is further monitored in real time, and the on-off of the alternating current contactor is directly controlled by a detection circuit when the detection circuit detects the abnormity of the signal.

Further, when the transformer main body is a single-phase transformer and the rated current is less than 20A, the mounting structure of the protection device is as follows:

the normally closed temperature switch is connected in series with the single-phase primary winding, the suspended end of the normally closed temperature switch serves as the input end of the single-phase transformer, and the iron core is grounded.

Further, when the transformer main body is a single-phase self-coupling transformer and the rated current is less than 20A, the mounting structure of the protection device is as follows:

the normally closed temperature switch is fixed on the single-phase secondary winding and fixed through the insulating layer, and is connected with the single-phase secondary winding in series, wherein the iron core is grounded.

Further, when the transformer main body is a three-phase transformer and the rated current is greater than 20A, the mounting structure of the protection device is as follows:

be equipped with three-phase primary, three-phase secondary and insulating layer on the iron core, the insulating layer internal fixation normally closed temperature switch, normally closed temperature switch is equipped with three groups and corresponds fixes three of three-phase secondary's portion, three groups normally closed temperature switch establishes ties, and two lead-out wires after its series connection are connected to alternating current contactor's coil signal control point.

Furthermore, a heat dissipation channel is arranged on the three-phase transformer.

Further, when the transformer main body is a three-phase self-coupling transformer and the rated current is greater than 20A, the mounting structure of the protection device is as follows:

be equipped with three-phase primary, three-phase secondary and insulating layer on the iron core, the insulating layer internal fixation normally closed temperature switch, normally closed temperature switch is equipped with three groups and corresponds fixes three of three-phase secondary's portion, three groups normally closed temperature switch establishes ties, and two lead-out wires after its series connection are connected to alternating current contactor's coil signal control point.

Compared with the prior art, the invention has the beneficial effects that: the self-diagnosis protection device can self-diagnose whether the transformer has overhigh operating temperature or overlarge load or not based on the actual conditions of variable and uncontrolled load environments of the single-phase and three-phase dry-type transformers, thereby carrying out the disconnection and power supply of the input side or the output side by taking self-protection and rear-end power utilization protection as the purposes.

Drawings

Fig. 1 is a schematic structural diagram of a single-phase primary winding wound by a single-phase transformer in embodiment 2 of the present invention.

Fig. 2 is a schematic structural diagram of a single-phase transformer in embodiment 2 of the present invention after a normally-closed temperature switch is installed.

Fig. 3 is an electrical schematic diagram of a single-phase transformer after installation in embodiment 2 of the present invention.

Fig. 4 is a schematic structural diagram of a single-phase self-coupled transformer in embodiment 3 of the present invention after installation.

Fig. 5 is a schematic structural diagram of a three-phase primary coil wound by a three-phase transformer in embodiment 4 of the present invention.

Fig. 6 is a schematic structural diagram of a three-phase transformer in embodiment 4 of the present invention after a normally-closed temperature switch is installed.

Fig. 7 is a schematic structural diagram of an ac contactor connected after a three-phase transformer is installed in embodiment 4 of the present invention.

Fig. 8 is a schematic structural diagram of a three-phase self-coupled transformer according to embodiment 5 of the present invention after installation.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the protection scope of the present invention is more clearly and clearly defined. It should be apparent that the described embodiments of the present invention are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In order to solve the problems in the prior art, the protection measure developed by the invention is to monitor the temperature on the winding in real time and diagnose the working state of the transformer by using the working temperature of the transformer.

Example 1, the specific structure of the present invention is as follows:

the utility model provides a dry-type transformer load self-diagnosis protection device, includes the transformer main part, be equipped with the iron core in the transformer main part and coil in winding 1 on the iron core, self-diagnosis protection device still includes:

a reset type normally closed temperature switch 2 arranged on the transformer main body, wherein a temperature sensor is arranged on the reset type normally closed temperature switch 2, and the normally closed temperature switch 2 is connected with the winding in series;

and the external alternating current contactor is connected in series with the input control or output control end of the winding and is electrically connected with the normally closed temperature switch 2, the normally open/normally closed conversion of the normally closed temperature switch 2 is used as a signal given medium of the alternating current contactor, the temperature of the winding is further monitored in real time, and the on-off of the alternating current contactor is directly controlled by a detection circuit when the detection circuit detects the abnormity of the signal.

Example 2:

as shown in fig. 1 to 3, when the transformer main body is a single-phase transformer and the rated current is less than 20A, the mounting structure of the protection device is as follows:

the iron core is provided with a single-phase primary winding, a single-phase secondary winding and an insulating layer, the normally closed temperature switch 2 is fixed when the inter-turn insulating layer is wound, the normally closed temperature switch 2 is connected with the single-phase primary winding in series, the suspended end of the normally closed temperature switch is used as the input end of the single-phase transformer, and the iron core is grounded.

The single-phase transformer is installed by the following specific steps:

step one, winding the single-phase primary winding and stopping, as shown in figure 1;

winding an inter-turn insulating layer, and fixing the normally-closed temperature switch 2 as shown in fig. 2;

step three, winding the insulating layer again, and then winding the single-phase secondary winding;

and step four, after the assembly of the single-phase transformer is finished, the normally-closed temperature switch 2 is connected in series into the single-phase primary winding, and the suspended end is used as the input end of the single-phase transformer, as shown in fig. 3.

Example 3:

as shown in fig. 4, when the transformer main body is a single-phase self-coupled transformer and the rated current is less than 20A, the mounting structure of the protection device is as follows:

the normally closed temperature switch 2 is fixed on the single-phase secondary winding and fixed through the insulating layer, the normally closed temperature switch 2 is connected with the single-phase secondary winding in series, and the iron core is grounded.

The assembly procedure of the single-phase self-coupled transformer in example 3 is the same as that in example 2.

Example 4:

as shown in fig. 5 to 7, when the transformer main body is a three-phase transformer and the rated current is greater than 20A, the mounting structure of the protection device is as follows:

be equipped with three-phase primary, three-phase secondary and insulating layer on the iron core, the insulating layer internal fixation normally closed temperature switch 2, normally closed temperature switch 2 is equipped with three groups and corresponds fixes three winding portions, three groups of three-phase secondary 2 establishes ties normally closed temperature switch, and two lead-out wires after its series connection are connected to alternating current contactor's coil signal control point.

A preferred technical solution of this embodiment: and a heat dissipation channel is arranged on the three-phase transformer.

The three-phase transformer of the embodiment 4 has the following specific assembling steps:

winding a three-phase primary winding and making an insulating layer, as shown in figure 5;

fixing the normally closed temperature switch 2, and then making a heat dissipation channel as shown in fig. 6;

and step three, finally, winding of a three-phase secondary winding is completed, and after the three-phase transformer is assembled, two outgoing lines of the normally-closed temperature switch 2 are connected to coil signal control points of the alternating current contactor. As shown in fig. 7.

Example 5:

as shown in fig. 8, when the transformer main body is a three-phase self-coupled transformer and the rated current is greater than 20A, the mounting structure of the protection device is as follows:

be equipped with three-phase primary, three-phase secondary and insulating layer on the iron core, the insulating layer internal fixation normally closed temperature switch 2, normally closed temperature switch 2 is equipped with three groups and corresponds fixes three winding portions, three groups of three-phase secondary 2 establishes ties normally closed temperature switch, and two lead-out wires after its series connection are connected to alternating current contactor's coil signal control point.

The three-phase self-coupled transformer assembly process of example 5 is the same as the three-phase transformer assembly process of example 4.

In summary, in the manufacturing process of the transformer, 2 transformer connection structures can be selected according to the magnitude of the working current: the first is to directly reserve the wiring end of the normally closed temperature switch 2, and the second is to install the protection of the inlet wire or the outlet wire of the alternating current contactor on the transformer.

The transformer adopts a self-reset normally-closed temperature switch (working current is less than 20A) which is connected in series in a winding or is wound between winding layers or between primary and secondary sides of the winding (working current is more than 20A), an external alternating current contactor is connected in series for input control or output control, and normally-open/normally-closed conversion of the temperature switch is used as a signal given medium of the alternating current contactor, so that the real-time monitoring of the temperature of the transformer is realized, the on-off of the alternating current contactor is directly controlled by detecting whether the signal is abnormal or not, and the protection of the operation of the transformer is further completed.

The self-diagnosis protection device can self-diagnose whether the transformer has overhigh operating temperature or overlarge load or not based on the actual conditions of variable and uncontrolled load environments of the single-phase and three-phase dry-type transformers, thereby carrying out the disconnection and power supply of the input side or the output side by taking self-protection and rear-end power utilization protection as the purposes.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (6)

1. The utility model provides a dry-type transformer load self-diagnosis protection device, includes the transformer main part, be equipped with the iron core in the transformer main part and coil in winding on the iron core, its characterized in that, self-diagnosis protection device still includes:

the reset type normally closed temperature switch (2) is arranged on the transformer main body, a temperature sensor is arranged on the reset type normally closed temperature switch, and the normally closed temperature switch (2) is connected with the winding in series;

and the external alternating current contactor is connected in series with the input control or output control end of the winding and is electrically connected with the normally closed temperature switch (2), the normally open/normally closed conversion of the normally closed temperature switch (2) is used as a signal given medium of the alternating current contactor, the temperature of the winding is further monitored in real time, and a detection circuit detects the abnormity of the signal and directly controls the on-off of the alternating current contactor.

2. A dry-type transformer load self-diagnosis protection device as claimed in claim 1, wherein when the transformer body is a single-phase transformer and the rated current is less than 20A, the mounting structure of the protection device is:

the iron core is provided with a single-phase primary winding, a single-phase secondary winding and an insulating layer, the normally closed temperature switch (2) is fixed when the inter-turn insulating layer is wound, the normally closed temperature switch (2) is connected with the single-phase primary winding in series, the suspended end of the normally closed temperature switch is used as the input end of the single-phase transformer, and the iron core is grounded.

3. A dry-type transformer load self-diagnosis protection device as claimed in claim 1, wherein when the transformer body is a single-phase autotransformer and the rated current is less than 20A, the mounting structure of the protection device is:

the normally closed temperature switch (2) is fixed on the single-phase secondary winding and fixed through the insulating layer, the normally closed temperature switch (2) is connected with the single-phase secondary winding in series, and the iron core is grounded.

4. A dry-type transformer load self-diagnosis protection device as claimed in claim 1, wherein when the transformer body is a three-phase transformer and the rated current is greater than 20A, the mounting structure of the protection device is:

be equipped with three-phase primary winding, three-phase secondary winding and insulating layer on the iron core, the insulating layer internal fixation normally closed temperature switch (2), normally closed temperature switch (2) are equipped with three groups and correspond fix three winding portion, three groups of three-phase secondary winding normally closed temperature switch (2) establish ties, and two lead-out wires after its series connection are connected to alternating current contactor's coil signal control point.

5. A dry-type transformer load self-diagnosis protection device as claimed in claim 4, wherein the three-phase transformer is provided with a heat dissipation channel.

6. A dry-type transformer load self-diagnosis protection device according to claim 1, wherein when the transformer body is a three-phase self-coupling transformer and the rated current is greater than 20A, the mounting structure of the protection device is as follows:

be equipped with three-phase primary winding, three-phase secondary winding and insulating layer on the iron core, the insulating layer internal fixation normally closed temperature switch (2), normally closed temperature switch (2) are equipped with three groups and correspond fix three winding portion, three groups of three-phase secondary winding normally closed temperature switch (2) establish ties, and two lead-out wires after its series connection are connected to alternating current contactor's coil signal control point.

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