KR101958301B1 - Oil immersed transformer, oil immersed transformer diagnosis apparatus and manufacturing method of oil immersed transformer - Google Patents

Abstract

According to an embodiment of the present invention, an oil immersed transformer comprises: an enclosure for receiving a winding conductor and insulating oil; and a moisture sensor arranged on one surface in the enclosure. The one surface in the enclosure can have an inclined part to focus moisture generated in the enclosure on the moisture sensor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-immersed transformer, an oil-immersed transformer, and an oil-immersed transformer,

The present invention relates to an inflow transformer, an inflow transformer diagnosis apparatus, and a method for manufacturing an inflow transformer.

Traditionally, an inflow transformer has been managed in a manner of replacing the transformer at regular intervals such as a time base maintenance (TBM) method, or in accordance with a replacement method according to a visual inspection of the manager.

The step-up and step-down of the voltage in the input transformer takes place in a winding conductor wound around a core such as an iron core. At this time, an arc (ARC) may occur due to an internal failure. Such an arc may generate a trace amount of air, or a harmful gas such as oxygen, nitrogen, or a combustible gas, and cause local overheating, thereby decomposing the insulating material and insulating oil in the inflowing transformer.

In addition, the inflowing transformer can cause insulation deterioration and short-circuiting accidents due to use for a long period of time. In addition, since the high temperature generated in the inflowing transformer decomposes the insulating oil having about 80% of the inside of the inflowing transformer, H2, CH4, C2H2, C2H6, C2H4 , C3H8, and the like can be generated.

Japanese Unexamined Patent Application Publication No. 2014-27150

However, the oil moisture content of the insulating oil, which increases with the breakdown of the insulating material and / or the insulating oil in the inflow transformer, may have a low correlation with the useful life or with the possibility of the inflow transformer failure, unlike conventional recognition.

Accordingly, the present invention provides an inflow transformer, an inflow transformer diagnosis apparatus, and an inflow transformer, which can secure highly reliable data for inflow transformer diagnosis by disposing a moisture sensor inside the inflow transformer to detect moisture in the form of water droplets in the inflow transformer And a manufacturing method thereof.

An inflow transformer according to an embodiment of the present invention comprises: an enclosure configured to receive a winding conductor and an insulating oil; And a moisture sensor disposed on an inner surface of the enclosure; Wherein an inner surface of the enclosure may have an inclined portion in which moisture generated inside the enclosure is concentrated in the moisture sensor.

An induction transformer diagnostic apparatus according to an embodiment of the present invention is configured to surround at least a part of a bushing of an input transformer having a moisture sensor, a winding conductor and an insulating oil therein and having an inclined portion, A packing having an attachment point electrically connected to the moisture sensor; And a diagnostic unit receiving the output value of the moisture sensor through the connection point and outputting or remotely transmitting information corresponding to the output value; . ≪ / RTI >

For example, the enclosure may include a cavity disposed on an inner surface of the enclosure to accommodate the moisture sensor, the moisture sensor configured to generate an output value corresponding to a water level of the cavity, .

For example, the enclosure may include a sensor fixing plate connected to the inclined portion to cover at least a part of the cavity; As shown in FIG.

For example, the enclosure may include: a securing member disposed within the cavity and securing the moisture sensor to the cavity via magnetism; As shown in FIG.

For example, the input transformer may include a bushing configured to draw the winding conductor; A packing configured to surround at least a portion of the bushing and having an attachment point; And an internal connection line electrically connecting the moisture sensor and the connection point; As shown in FIG.

For example, the inflow transformer may further include a light emitting unit disposed in the packing, receiving the output value of the moisture sensor, and emitting light in a pattern corresponding to the output value.

For example, the input transformer may include a light receiving unit arranged to receive light generated in the light emitting unit; And a processing unit for generating inflow transformer state information corresponding to a light receiving result of the light receiving unit; As shown in FIG.

For example, the inflow transformer may further include a communication unit electrically connected to the connection point for receiving an output value of the moisture sensor, generating a signal including information corresponding to the output value, and remotely transmitting the signal .

A method of manufacturing an input transformer according to an embodiment of the present invention includes the steps of assembling an enclosure having a cavity and an inclined portion surrounding at least a portion of the cavity to a winding conductor; And filling the assembled enclosure with insulating oil; And the assembling step may include inserting a moisture sensor into the cavity.

For example, the method for manufacturing an inflow transformer includes the steps of installing a packing having a connection point in a bushing; The assembling may further include assembling the bushing in a portion where the winding conductor is drawn out from the enclosure.

One embodiment of the present invention can assure accurate diagnosis of the state of the input transformer and improve the manager's efficiency of managing the input transformer since high reliability data for the diagnosis of the input transformer can be secured.

Further, according to an embodiment of the present invention, it is possible to prevent the additional water inflow path due to the formation of a separate hole in spite of the internal arrangement of the moisture sensor, thereby securing both the accuracy of diagnosis and the durability.

1 is a block diagram of an input transformer and an input transformer diagnostic apparatus according to an embodiment of the present invention.
Fig. 2 is an enlarged view of one side of the enclosure shown in Fig. 1. Fig.
3A to 3D are views illustrating various forms of one side of the enclosure.
4A and 4B are views showing the packing shown in FIG.
FIGS. 5A and 5B are views showing a light emitting unit and / or a communication unit included in the inflow transformer and the inflow transformer diagnostic apparatus according to an embodiment of the present invention.
6 is a flowchart illustrating a diagnostic process of the input transformer according to an embodiment of the present invention.
7A and 7B are flowcharts illustrating the diagnostic process of the inflow transformer shown in FIG.
FIG. 8A is a flowchart illustrating a process until the light emitting unit shown in FIG. 5A operates.
FIG. 8B is a flowchart illustrating a process up to the operation of the light emitting unit and the communication unit shown in FIG. 5B.
FIG. 9 is a flowchart illustrating the operation of the light receiving unit when the light receiving unit is applied between the light emitting unit and the communication unit shown in FIG. 5B.
10 is a flowchart illustrating a method of manufacturing an input transformer according to an embodiment of the present invention.
11 is a view showing a process until failure of the inflow transformer occurs.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order that those skilled in the art can easily carry out the present invention.

1 is a block diagram of an input transformer and an input transformer diagnostic apparatus according to an embodiment of the present invention.

1, an inflow transformer and an inflow transformer diagnosis apparatus according to an embodiment of the present invention includes an enclosure 100, a packing 110, a moisture sensor 113, a plurality of bushings 114a, 114b, and 114c, And may include at least a part of the dielectric oil 121, the winding conductor 122, the insulating paper 123, and the pressure-proof valve 124. [

The enclosure 100 may be configured to receive the winding conductors 122 and the insulating oil 121. The winding conductors 122 may be wound around a core such as an iron core. The winding conductors 122 can be viewed as a plurality of layers stacked, and an insulating paper 123 may be disposed between the plurality of layers. Also, the winding conductors 122 may be drawn out of the input transformer through at least a portion of the plurality of bushings 114a, 114b, 114c.

Referring to FIG. 11, moisture may be introduced into the enclosure 100 during an operation process, an installation process, a construction process, and / or a manufacturing process of the inflow transformer. The moisture introduced into the enclosure 100 may be absorbed into the insulating paper 123 in the form of water drops. The insulating paper 123 that absorbs moisture may lower the interlaminar insulation strength of the winding conductors 122 and cause dielectric breakdown.

Moisture in the form of water drops absorbed by the insulating paper 123 can be dropped onto the inner surface 101 of the enclosure 100 by gravity. The inner surface (101) of the enclosure (100) may have an inclined portion so that the moisture in the form of water drops can be concentrated to a specific position. That is, the inner surface 101 may serve as a moisture trap.

The moisture sensor 113 is disposed at the specific position, so that it can collectively detect moisture in the form of droplets generated inside the enclosure 100. Accordingly, the detection result of the moisture sensor 113 and the moisture absorption amount of the insulating paper 123 can have a high correlation.

Since the dielectric strength or the possibility of dielectric breakdown is highly correlated with the moisture absorption amount of the insulating paper 123, the detection result of the moisture sensor 113 can have high reliability as data for the inflow transformer diagnosis.

That is, according to the embodiment of the present invention, the input transformer and the inflow transformer diagnosis apparatus can secure high reliability data for diagnosis of the inflow transformer, so that it is possible to support accurate diagnosis of the inflow transformer state, Can be improved.

Fig. 2 is an enlarged view of one side of the enclosure shown in Fig. 1. Fig.

Referring to FIG. 2, the enclosure may include an inner surface 101 and a cavity 102. A moisture sensor may be inserted into the cavity 102.

Moisture in the form of droplets generated inside the enclosure can move toward the cavity 102 on the inner surface 101 of the enclosure.

The water level of the cavity 102 can be increased as the moisture in the form of water droplets generated in the inside of the enclosure increases. Therefore, the moisture sensor inserted into the cavity 102 can be configured to generate an output value corresponding to the level of the cavity 102.

For example, the moisture sensor may have at least one resistive element set up in the gravitational direction, the circuit having a circuit configured such that the electrical connection path of the at least one resistive element varies with the water level, May have a structure in which the resistance value of the resistor varies depending on the water level. The moisture sensor may apply a voltage to the at least one resistance element, sense current flowing through the at least one resistance element, and generate an output value corresponding to the current.

3A to 3D are views illustrating various forms of one side of the enclosure.

Referring to FIG. 3A, the enclosure may include a sensor fixing plate 103a that is connected to an inclined portion of the inner surface 101a and covers at least a part of the cavity 102a.

Referring to FIG. 3B, the enclosure may include a fixing member 103b disposed in the cavity 102b of the inner side surface 101b and fixing the moisture sensor to the cavity 102b through an adhesive material.

3C, the enclosure may include a fixing member 103c that is disposed in the cavity 102c of the inner surface 101c and fixes the moisture sensor to the cavity 102c through a bolt connection.

Referring to FIG. 3D, the enclosure may include a fixing member 103d disposed in the cavity 102d of the inner surface 101d and fixing the moisture sensor to the cavity 102d through magnetism.

4A and 4B are views showing the packing shown in FIG.

Referring to Figure 4A, the packing 110 may be configured to surround at least a portion of the bushing and may have a connection point 110a.

Referring to FIG. 4B, the connection point may electrically connect the internal connection line 110b and the external connection line 110c. The internal connection line 110b may be electrically connected to the moisture sensor in the enclosure.

That is, the packing 110 can electrically connect the inside and the outside of the enclosure. When the packing 110 is installed in the bushing, the inside and the outside of the enclosure can be electrically connected through the holes provided for the bushing in the enclosure, and the insulation performance of the insulated conductor can be secured by utilizing the insulation performance of the bushing. That is, the inside and the outside of the enclosure can be stably connected to each other without having a separate hole.

Therefore, the inflow transformer according to the embodiment of the present invention can prevent the additional water inflow path due to the formation of the separate hole in spite of the internal arrangement of the moisture sensor, thereby securing both the accuracy of diagnosis and the durability.

Meanwhile, the external connection line 110c may be electrically connected to the diagnosis unit that receives the output value of the moisture sensor through the connection point 110a and outputs or remotely transmits information corresponding to the output value. The diagnosis unit may be disposed in the packing, but is not limited thereto.

FIGS. 5A and 5B are views showing a light emitting unit and / or a communication unit included in the inflow transformer and the inflow transformer diagnostic apparatus according to an embodiment of the present invention.

Referring to FIG. 5A, the diagnosis unit disposed in the packing 110 may include a light emitting unit 112 and / or a processing unit 115. [

The light emitting unit 112 may be disposed in the packing 110 to receive the output value of the moisture sensor and emit light in a pattern corresponding to the output value. The light emitting unit 112 may provide information to a supervisor in the field of water amount information in the form of droplets generated in the inflow transformer.

According to the design, the light emitting unit 112 can output light or infrared rays toward the light receiving unit (not shown). The light receiving unit may transmit the output value corresponding to the light receiving result to the processing unit 115 or the communication unit 116.

The processing unit 115 may be disposed in the packing 110 to receive the output value of the moisture sensor and generate information corresponding to the output value. For example, the information may include state information of the input transformer (e.g., faulty, faulty, etc.). For example, the processing unit 115 may be implemented as at least one of a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, an application specific integrated circuit (ASIC), and a field programmable gate array .

Referring to FIG. 5B, the diagnosis unit disposed in the packing 110 may include a light emitting unit 112 and / or a communication unit 116. FIG.

The communication unit 116 is disposed in the packing 110, receives the output value of the moisture sensor, generates a signal including information corresponding to the output value, and remotely transmits the signal. For example, the communication unit 116 may be implemented as at least one of a modem, a network interface card (NIC), an integrated network interface, a radio frequency transmitter / receiver, an infrared port, and a USB connection. have.

6 is a flowchart illustrating a diagnostic process of the input transformer according to an embodiment of the present invention.

Referring to FIG. 6, when water flows into the inflow transformer (S110), water in the form of droplets may be transferred to the moisture sensor (S120) and collected (S130).

The moisture sensor senses the collected moisture (S140) and transmits a signal to the diagnosis unit (S150).

The diagnosis unit may generate the input transformer state information and transmit the information to the manager or the server (S160). For example, the diagnosis unit may transmit the information to a server of a system such as a manager's portable terminal, a Distribution Automation System (DAS), a Supervisory Control and Data Acquisition (SCADA).

The manager can take measures (S170) on the influent transformer Tr according to the received information.

7A and 7B are flowcharts illustrating the diagnostic process of the inflow transformer shown in FIG.

Referring to FIG. 7A, the moisture sensor can monitor (20) the moisture inside the inflow transformer Tr in real time. When moisture is sensed 30 by the moisture sensor, the moisture sensor measures 40 the resistance value of the resistor and stores the measured value in memory (e.g., RAM, ROM, magnetic storage, optical storage, etc.) A database (DB) 50 can be constructed.

The diagnostic unit receiving the measurement value of the moisture sensor can analyze the trend of the measurement value (60) to grasp the pattern of the measurement value, and generate the monitoring signal (70) based on the pattern.

Thereafter, the manager may proceed with a visual inspection 81 of the input transformer. For example, the manager can determine the state of the inflow transformer by checking the light emission pattern of the light emitting portion, such as the visible light LED 82 or the IR LED 83. [

In addition, the diagnosis unit can remotely transmit the monitoring signal to the manager or the management server through the wireless communication (84). The wireless communication 84 may be implemented by a method such as Li-Fi, LoRa, Zigbee, but is not limited thereto.

Referring to FIG. 7B, the light emitting unit emits light (92) irregularly when the trend of the measured value changes (91), and when the trend does not change, can do. Thereafter, the diagnosis unit may convert information corresponding to whether the measured value changes trend.

FIG. 8A is a flowchart illustrating a process until the light emitting unit shown in FIG. 5A operates.

Referring to FIG. 8A, when moisture flows into the interior of the inflow transformer 210, water in the form of droplets can be moved 211 to the moisture sensor 210 and then collected 212.

The diagnostic unit electrically connected to the moisture sensor may analyze the measured value trend of the moisture sensor (213) and transmit the analysis result to the light emitting unit. The light emitting unit may be driven 214 according to the analyzed result.

FIG. 8B is a flowchart illustrating a process up to the operation of the light emitting unit and the communication unit shown in FIG. 5B.

Referring to FIG. 8B, when moisture flows into the interior of the inflow transformer 310, water in the form of droplets can be moved (311) to the moisture sensor (312).

The diagnostic unit electrically connected to the moisture sensor may analyze the trend of the measured value of the moisture sensor (313) and transmit the analysis result to the light emitting unit and the communication unit. The light emitting unit may be driven (314) according to the analyzed result. The communication unit may transmit information corresponding to the analyzed result to the administrator or the server through the wireless communication 315. [

FIG. 9 is a flowchart illustrating the operation of the light receiving unit when the light receiving unit is applied between the light emitting unit and the communication unit shown in FIG. 5B.

Referring to FIG. 9, when the light emitting unit is driven (314), the light emitting pattern information of the light emitting unit may be input to the light receiving unit 410. The light receiving unit 410 may transmit the light emission pattern information to the diagnostic unit.

The diagnostic unit may search 430 for the emission pattern information. That is, the diagnostic unit performs pattern information conversion 450 to perform repetitive comparison 435 on the stored light-receiving pattern library 440 of the light-emitting pattern information and generate inflow transformer state information corresponding to the comparison result, Information can be output (460).

10 is a flowchart illustrating a method of manufacturing an input transformer according to an embodiment of the present invention.

Referring to FIG. 10, a method of manufacturing an induction transformer according to an exemplary embodiment of the present invention includes a step of providing a winding conductor (S210), a step of forming a housing having a cavity and an inclined portion surrounding at least a part of the cavity (S220) assembling the package to the winding conductors, filling the assembled enclosure with insulating oil (S230), and installing the packing (S240).

The step S220 of assembling the enclosure to the winding conductors may include a step S221 of inserting a moisture sensor into the cavity and a step S222 of assembling the bushing. That is, the moisture sensor can be inserted into the inflow transformer during assembly of the enclosure.

Meanwhile, the winding conductor providing step (S210) may include, but is not limited to, a winding conductor manufacturing step, a winding stabilizing step, a winding drying step, and a core assembling step.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Anyone can make various variations.

100: enclosure
101: Inside surface
102: cavity
110: Packing
112:
113: Moisture sensor
114a, 114b, 114c:
121: insulating oil
122: winding conductor
123: insulating paper
124: Pressure relief valve

Claims (11)

An enclosure configured to receive a winding conductor and an insulating oil;
A moisture sensor disposed on an inner surface of the enclosure;
A bushing configured to draw the winding conductor;
A packing configured to surround at least a portion of the bushing and having an attachment point; And
An internal connection line for electrically connecting the moisture sensor and the connection point; / RTI >
Wherein an inner surface of the enclosure has an inclined portion such that moisture generated within the enclosure is concentrated in the moisture sensor.
The method according to claim 1,
Wherein the enclosure comprises a cavity disposed on an inner surface of the enclosure and adapted to receive the moisture sensor,
Wherein the moisture sensor is configured to produce an output value corresponding to a water level of the cavity.
3. The apparatus of claim 2,
A sensor fixing plate connected to the inclined portion to cover at least a part of the cavity; ≪ / RTI >
3. The apparatus of claim 2,
A fixing member disposed in the cavity and fixing the moisture sensor to the cavity through magnetism; Further comprising: an input transformer.
delete The method according to claim 1,
And a light emitting unit disposed in the packing and receiving an output value of the moisture sensor and emitting light in a pattern corresponding to the output value.
The method according to claim 6,
A light receiving unit arranged to receive light emitted from the light emitting unit; And
A processing unit for generating the input transformer state information corresponding to the light receiving result of the light receiving unit; Further comprising: an input transformer.
The method according to claim 1,
And a communication unit electrically connected to the connection point for receiving an output value of the moisture sensor, generating a signal including information corresponding to the output value, and remotely transmitting the signal.
A packing configured to surround at least a portion of a bushing of an input transformer having a moisture sensor, a winding conductor and an insulating oil therein and having an inclined portion and having an attachment point electrically connected to the moisture sensor, ; And
A diagnostic unit for receiving an output value of the moisture sensor through the connection point and outputting or outputting information corresponding to the output value; And an inverter transformer.
Assembling an enclosure with a winding conductor having a cavity and an inclined portion surrounding at least a portion of the cavity;
Filling the assembled enclosure with insulating oil; And
Installing a packing having an attachment point in a bushing; Lt; / RTI >
Wherein the assembling comprises inserting a moisture sensor into the cavity and assembling the bushing to a portion of the enclosure from which the wire conductor is drawn. delete

Images