KR101611861B1 - Temperature indicator device for power transformer - Google Patents

Temperature indicator device for power transformer Download PDF

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Publication number
KR101611861B1
KR101611861B1 KR1020150110952A KR20150110952A KR101611861B1 KR 101611861 B1 KR101611861 B1 KR 101611861B1 KR 1020150110952 A KR1020150110952 A KR 1020150110952A KR 20150110952 A KR20150110952 A KR 20150110952A KR 101611861 B1 KR101611861 B1 KR 101611861B1
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South Korea
Prior art keywords
temperature
transformer
sensor
guide
heat
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KR1020150110952A
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Korean (ko)
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박정준
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박정준
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K5/00—Measuring temperature based on the expansion or contraction of a material
    • G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/04—Scales
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K5/00—Measuring temperature based on the expansion or contraction of a material
    • G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
    • G01K5/54—Measuring temperature based on the expansion or contraction of a material the material being a solid consisting of pivotally-connected elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K5/00—Measuring temperature based on the expansion or contraction of a material
    • G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
    • G01K5/56—Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid
    • G01K5/58—Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid the solid body being constrained at more than one point, e.g. rod, plate, diaphragm
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/06—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts
    • H01H61/063—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts making use of a bimetallic element
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/044—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a semiconductor device to sense the temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers

Abstract

The present invention relates to a temperature sensing device for a railway transformer and, more specifically, relates to the temperature sensing device for a railway transformer automatically blocking a transformer from an entire system when the transformer reaches a limit temperature. To achieve this purpose, the temperature sensing device for the railway transformer comprises: a main body (100) having an inner space; a first sensor (200) connected to a temperature indicator (111), operating the temperature indicator (111); a coupling pipe body (300) where the first sensor (200) is stored to be fixated; a flange pipe body (400) where heat inside the transformer is transmitted; and a second sensor (500) provided inside the coupling pipe body (300).

Description

[0001] TEMPERATURE INDICATOR DEVICE FOR POWER TRANSFORMER [0002]

The present invention relates to a temperature sensing apparatus for a railway transformer, and more particularly, to a temperature sensing apparatus for a railway transformer, more precisely measuring the temperature change inside the transformer in real time and preventing an accident caused by overheating of the transformer, In particular, the present invention relates to a temperature sensing apparatus for a railway transformer that automatically extends a temperature measurement period for sending an alarm signal and automatically cuts off the transformer from the entire system when a limit temperature is reached.

In general, a power transformer for railway power is one of the most used equipment among the electric equipment for railway industry. It is used to increase or decrease the AC voltage in the transmission system or power distribution system, And the like.

Such a transformer is one of the essential elements for the operation of the transformer. It is essential to accurately measure the internal temperature change during the operation of the transformer and to thermally control the surrounding cooling device through the sensed value. When the transformer is overheated, it is instantaneously detected to prevent accidents from spreading, damage to equipment and system.

Among them, the temperature sensing device for a railway transformer is composed of a bimetallic coil sensor mounted on a transformer for measuring the internal temperature, and a contact for contacting an instruction connected to the bimetallic sensor and sending an alarm signal.

In this background, various temperature sensing devices for railway transformers are being developed. In the case of the temperature sensing devices for railway transformers shown below, technological problems to be improved are being exposed.

In the conventional case, since the alarm signal is transmitted by contacting the contact only when the lead connected to the bimetal coil sensor of the thermometer rises to the limit temperature, when the temperature falls, There is a problem that explosion and fire accidents due to breakage of the transformer are generated as a result of not recognizing the cause that causes the user's perception and temperature increase or long-term maintenance related thereto.

In addition, in the conventional case, since the guide contacts the contact point in a situation where the limit temperature is reached and only the alarm signal is continuously transmitted, an excessive temperature rise that can be diffused due to an upper limit temperature, There is a problem of explosion and fire accident of the transformer in the absence of the constitution of cutting off the entire system of the transformer.

Korean Unexamined Patent Publication No. 2003-0007262 (published on Jan. 23, 2003) "A thermometer for a transformer equipped with a direct instruction is proposed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method and apparatus for measuring the internal temperature of a transformer by rotating a pointer using a first sensor positioned inside a transformer, The contact point of the alarm signal is gradually returned even if the temperature is lowered through the second sensor. Accordingly, the alarm signal section for the specific temperature is expanded to recognize the cause of the user's perception and temperature rise The present invention provides a temperature sensing apparatus for a railway transformer, which can prevent a fire or an explosion due to breakage of a transformer by ensuring long time maintenance.

In addition, the present invention has a configuration in which the thermometer guide rotates by a temperature rise, and when the instruction reaches the limit temperature, an electrical connection is made to send a shutoff signal to the transformer, thereby causing an internal fire and an explosion Another goal is to automatically shut down the entire system of the transformer at the critical temperature to prevent further accidents.

According to an aspect of the present invention,

A temperature sensing device for a railway transformer,

A main body having a space therein and coupled with a graduation plate having a temperature display graduation formed on the front surface thereof and performing a temperature display by rotating the temperature guide secured in front of the graduation plate according to an internal temperature change of the transformer;

A first sensor connected to the temperature indicator, the bimetallic coil gradually rotating to operate the temperature indicator when heat is transferred to the transformer;

A coupling tube through which the first sensor is received and fixed in a state where the first sensor is inserted into a rear inner side of the body, the heat being transferred inside the transformer;

A flange body to which a part of the first sensor is fixed in the transformer while being coupled to the outer periphery of the front side of the coupling tube, the heat being transferred inside the transformer;

And a second sensor provided inside the coupling tube for transmitting heat and sensing the temperature when the temperature rises to a specific temperature,

The first sensor transmits a shutoff signal to the transformer when the limit temperature is reached, and the second sensor transmits a continuous alarm signal at a specific temperature interval,
Wherein the main body is provided on the front surface of the graduation plate in an inner space of the glass plate and contacts the flow guide provided adjacent to the temperature guide when the temperature guide reaches the limit temperature of the transformer while being rotated by the first sensor, And a guide contactor for transmitting a shutoff signal to the transformer. The present invention further provides a temperature sensing device for a railway transformer.

According to the present invention, since the second sensor for sending an alarm signal in contact with the action of the bimetal switch at a specific temperature is further provided, the contact point of the alarm signal gradually returns even if the temperature falls, It is possible to prevent the explosion and the fire accident due to breakage of the transformer as long as maintenance is performed by securing the time for performing the cause of recognition and temperature increase of the user.

In addition, when the instruction reaches the limit temperature, electrical connection is made to send out the shutoff signal to the transformer, so that the entire system of the transformer is shut off at the limit temperature where the internal fire and explosion caused by it cause to prevent more accident There is another effect you can do.

FIG. 1 is a perspective view of a temperature sensing apparatus for a railway transformer according to a first embodiment of the present invention; FIG.
FIGS. 4 to 5 are operational states of a temperature sensing apparatus for a railway transformer according to a first embodiment of the present invention; FIG.
FIG. 6 is a block diagram of a temperature sensing device for a railway transformer according to a second embodiment of the present invention; FIG.

The temperature sensing apparatus for a railway transformer according to the present invention will be understood by the following detailed description with reference to the accompanying drawings.

In the following description of the exemplary embodiments of the present invention, a detailed description of components that are widely known and used in the art to which the present invention belongs is omitted, and unnecessary explanations thereof are omitted. It is to communicate the point more clearly.

1 to 3 are diagrams for explaining a configuration of each part of a temperature sensing apparatus for a railway transformer according to each embodiment of the present invention.

The temperature sensing device 1 for a railway transformer will now be described with reference to FIG. 1. Referring to FIG. 1, the temperature sensing device 1 for a railway transformer includes a main body 100 for performing temperature display by rotating the temperature guide 111 according to an internal temperature of the transformer, A first sensor 200 for operating the temperature indicator 111, a coupling tube 300 for transmitting the internal heat of the transformer while fixing the first sensor 200, And a second sensor 500 for detecting the temperature of the flange tube 400 when the temperature of the transformer is raised to a specific temperature.

Hereinafter, as a basic configuration of the present invention, the configuration of each part according to the first embodiment will be described in detail with reference to FIG. 1 to FIG. 1 is a side cross-sectional view of a temperature sensing device for a railway transformer according to a first embodiment, FIG. 2 is a structural view of each part of a coupling tube of a temperature sensing device for a railway transformer according to a first embodiment, Fig. 2 is a schematic view of a flange tube of a temperature sensing device for a railroad transformer according to the present invention.

First, the main body 100 includes: A temperature indicator 111 fastened to the front of the scale plate 115 rotates in accordance with a change in the internal temperature of the transformer 115, To perform temperature display.

The main body 100 is fixedly coupled to the outer wall of the transformer so as to allow the inside temperature of the transformer to be visually recognized from the outside, and the separate connector is electrically connected to detect a temperature change of the transformer at a long distance.

The main body 100 has a space therein and a glass plate 123 is coupled to the front surface of the space and a graduation plate 115 (Not shown).

The case 120 further includes a terminal 125 to be electrically connected to the pointer contactor 110, which will be described later.

At this time, the glass plate 123 has a sealing structure using packing or the like in order to prevent the external moisture from flowing into the case 120, and the scale plate 115 is provided with a number And the like are printed.

The main body 100 further includes a lid 121 hinged to the front of the case 120 by using a lid hinge 122 and opened and closed by rotating around the lid hinge 122.

The lid 121 is for preventing a stone or other foreign matter from being damaged by hitting the glass plate 123 at a high speed when the transformer is a moving type like a train.

In this case, the lid 121 may be further provided with a fixing member 124 for fixing the lid 121 in a closed state. The fixing member 124 fixes the lid 121 in a closed state by a bolt fastening method, The inner surface of the lid 121 is provided with a packing for sealing function.

Here, the main body 100 is installed on the front surface of the graduation plate 115 in the inner space of the glass plate 123, and the temperature sensor 111 is rotated by the first sensor 200, And a guide contactor 110 for contacting the flow guide 113 provided adjacent to the temperature guide 111 and transmitting an interruption signal to the transformer by being electrically connected thereto.

The guide contactor 110 functions to display a temperature change in real time while transmitting an electrical signal for shutting down the transformer by making it electrically connected to the rotating temperature guide 111 according to the temperature change inside the transformer.

The guide contactor 110 is rotatably coupled to the front surface of the scale plate 115 and is connected to one end of the first sensor 200 at the center of the axis of the scale plate 115, (111).

The temperature sensor 111 has a leading end in the form of a thin rod-like plate, and one end of the temperature indicator 111 is fixedly coupled to a shaft provided on the front surface of the first sensor 200, .

The guide contactor 110 further includes a first contact 112 fixedly coupled to one side of the temperature guide 111 and rotating in the same manner as the temperature guide 111.

The first contact 112 protrudes from the front surface of the temperature indicator 111 in the shape of 'a', and the protruded opposite side thereof is connected to the electric wires so as to be electrically connected.

The guide contactor 110 further includes a flow guide 113 which is axially adjacently rotated in front of the temperature guide 111 to allow a user to arbitrarily set a limit temperature of the transformer.

The flow guide 113 has a tip in the form of a thin rod plate and is rotatable about its axis as it is axially coupled to a position adjacent to the front surface of the temperature guide 111 so as to indicate the limit temperature of the transformer. (113).

The guide contactor 110 is fixedly coupled to the rear surface of the flow guide 113. When the temperature guide 111 reaches the limit temperature of the transformer and the first contact point 112 contacts the electric guide 111, And a second contact (114) connected and connected to transmit a cutoff signal to the transformer.

The second contact 114 is protruded from the rear surface of the flow guide 113 and positioned within the rotation radius of the first contact 112 so that the second contact 114 is electrically connected to the first contact 112 when the first contact 112 is in contact therewith.

On the other hand, the limit temperature of the above-mentioned transformer is 100 DEG C or higher, but the limit temperature can be set to 100 DEG C or higher or lower according to the user's choice.

Therefore, according to the present invention, there is provided a structure for transmitting a shutoff signal to a transformer by making an electrical connection when the temperature guide 111 reaches the limit temperature while the temperature indicator is displayed while rotating according to the internal temperature rise of the transformer The entire system of the transformer is automatically shut off at the limit temperature at which the internal fire and the explosion due to the internal fire are generated.

The first sensor 200 includes: The bimetal coil is connected to the temperature guide 111, and when the heat inside the transformer is transferred, the bimetal coil gradually rotates to operate the temperature indicator 111.

The first sensor 200 is located in a temperature measuring part inside the transformer, and as the heat is transferred, the bimetal coil is rotated by the thermal expansion coefficient, and the temperature guide 111 connected to the end part is rotated, The rising signal is displayed in real time, and the blocking signal to the transformer can be transmitted, especially when the limit temperature is reached.

At this time, the first sensor 200 is provided with a bimetal coil in which two types of thin metals having different degrees of expansion and contraction according to a change in temperature are formed in a coil shape, and the bimetal coil is provided with a shaft portion And the temperature guide 111 is fixedly connected.

In addition, the first sensor 200 further includes a protective pipe 210 for protecting the bimetal coil and a shaft fixing member 220 for fixing the tip shaft portion of the bimetal coil while freely rotating.

Accordingly, the present invention has a structure in which the first sensor 200 is connected to the temperature indicator 111 that can be recognized from the outside in a state where the first sensor 200 is inserted into the temperature measurement position inside the transformer, so that the internal temperature of the transformer is normally measured in real time .

The coupling tube 300 includes: The first sensor 200 is received and fixed inside the main body 100 in a state where the first sensor 200 is inserted into the inside of the rear portion of the main body 100 so that the heat inside the transformer is transmitted.

The coupling tube 300 functions to join the main body 100 to the flange tube 400 described later while fixing the first sensor 200 inside the transformer.

The coupling tube 300 is inserted into the rear of the main body 100 in a screwed manner and has a fixing pipe 310 which is inserted and fixed to the inner side of the front portion of the first sensor 200 .

The fixing pipe 310 is formed in the shape of a tube and has a structure in which threads are formed on the outer periphery at the front in order to penetrate the case 120 of the main body 100 through the back of the case 120.

At this time, it is preferable to seal the connection part of the fixing pipe 310 with a packing.

The coupling tube 300 is coupled to the rear side of the fixing pipe 310 and has a rear portion of the first sensor 200 inserted and fixed to the inside of the coupling tube 300. The first sensor 200 is provided with a transformer And a first heat conduction pipe 320 for transferring internal heat.

The first heat conduction tube 320 is opened at one side and the opposite side is formed in a closed tube shape and has a space inside the first heat conduction tube 320 in addition to the first sensor 200 and a second sensor 500 Structure.

At this time, the first heat conduction pipe 320 is inserted into one end of the fixing pipe 310 and is fixed by welding in a state where the first heat conduction pipe 320 is made of a metal material with easy heat conduction.

The coupling tube 300 further includes a coupling 330 for passing through the outer periphery of the fixing pipe 310 and moving the flange tube 400 around in a helical manner.

The coupling 330 is formed in a tubular shape, and a thread and nut are integrally formed on the outer periphery of the coupling 330, and a flange tube 400 described later is fastened and fixed to a screw thread on the outer periphery of the coupling 330 .

In addition, the coupling 330 penetrates the outer circumference of the fixing pipe 310 and moves forward and backward. The flange tube 400 is fixedly coupled with the coupling 330 to adjust the length of insertion of the first sensor 200 into the transformer .

Further, the flange body 400 includes: A part of the first sensor 200 is fixed to the inside of the transformer while being fastened to the outer circumference of the front side of the coupling tube 300 so that the heat inside the transformer is transmitted.

The flange tube 400 is fastened to the coupling tube 300 so as to fix the first sensor 200 to the inside of the transformer while fixing the body 100 to the outside of the transformer.

The flange body 400 includes a flange 410 fastened to the outer periphery of the coupling 330 provided on the coupling tube 300 by a spiral connection and having one surface thereof being tightly fixed to the transformer .

The flange 410 is made of a circular plate having a through hole corresponding to the thread of the coupling 330 formed at its inner center with threads on the inner periphery thereof and has a plurality of holes bolted to the outer wall of the transformer .

The flange body 400 is fixed to one surface of the flange 410 and is positioned inside the transformer so that the first heat conduction tube 320 is inserted into the flange body 400 to connect the first heat conduction tube 320 to the inside of the transformer And a second heat conduction pipe (420) for transferring the internal heat of the transformer while being positioned in the heat exchanger.

The second heat conduction pipe 420 has a structure in which one side is opened and the opposite side is formed as a closed tube shape, and the first heat conduction pipe 320 is accommodated.

At this time, the second heat conduction pipe 420 is inserted into the inside of the flange 410 and is fixed by welding in a state where the second heat conduction pipe 420 is made of a metal material with easy heat conduction.

The second sensor 500 includes: The coupling tube 300 is provided inside the coupling tube 300 to transmit heat, and is provided to sense the temperature of the coupling tube 300 when the temperature of the coupling tube 300 rises to a specific temperature.

The second sensor 500 senses the temperature of the transformer when the temperature of the transformer is high enough to send an alarm signal and electrically transmits the alarm signal continuously in a specific temperature interval.

The second sensor 500 further includes first and second electrodes 510 and 520 shorted to each other.

The first and second electrodes 510 and 520 are connected to the outside of the second sensor 500 in a state where the first and second electrodes 510 and 520 are short-circuited.

The second sensor 500 is coupled to the second electrode 520 and is seesawed using an elastic force so that a terminal 531 provided on one side contacts the first electrode 510, And a snap spring terminal 530 for electrically connecting the first electrode 510 and the second electrode 520 to each other.

The snap spring terminal 530 is constructed such that a center portion of the snap spring terminal 530 is connected to the second electrode 520 in a state in which a flat snap spring is engaged in a lower portion of the plate, The terminal 531 may be fixedly coupled to an adjacent position of the first electrode 510 so as to be electrically connected to the first electrode 510.

The second sensor 500 is coupled to the first electrode 510. When the temperature inside the transformer rises, one of the snap spring terminals 530 is pressed by the thermal expansion coefficient of the bimetal, And a bimetal switch 540 for allowing the second electrode 531 to contact the first electrode 510.

When the bimetal switch 540 is fabricated by stacking two kinds of thin metals having different degrees of thermal expansion and heat shrinking, one end of the bimetal is fixed to the first electrode 510, And is adjacent to one side of the terminal 530.

When heat is transferred to the bimetal switch 540 and the bimetal is actuated by the thermal expansion coefficient, one side of the snap spring terminal 530 is pressed to raise the terminal 531 toward the first electrode 510, The first electrode 510 and the second electrode 520 are electrically connected to each other to transmit an electrical signal.

On the other hand, the operating temperature of the bimetal switch 540 is in the range of 79 ° C. to 90 ± 5 ° C., and an alarm signal is transmitted at a temperature corresponding thereto.

Accordingly, since the bimetal switch of the second sensor 500 gradually acts on the bimetal switch at a specific temperature to generate an electrical contact to send an alarm signal, even if the temperature falls, the contact of the alarm signal It gradually returns to extend the alarm signal section for a certain temperature, thus securing the time for performing the cause of recognition that causes the user to perceive and raise the temperature, so as to prevent the explosion and fire accident caused by breakage of the transformer .

4 to 5 are diagrams showing an operation state of the temperature sensing apparatus for a railway transformer according to the first embodiment of the present invention.

4, when the temperature inside the transformer rises, the bimetal coil of the first sensor 200 gradually rotates due to the thermal expansion coefficient, 1 temperature sensor 111 connected to the sensor 200 is rotated to perform the temperature display.

At this time, when the temperature inside the transformer rises from 79 ° C. to 90 ± 5 ° C., the second sensor 500 detects it and sends an electric signal to perform an alarm function by a lamp or sound, The first contact point 112 of the temperature pointer 111 and the second contact point 114 of the induction pointer are brought into contact with each other so that the electric contact 111 is rotated to the limit temperature of the transformer This allows the shutdown signal to be sent to the entire system of the transformer.

5, the second sensor 500 among the temperature sensing apparatuses 1 for a railway transformer having the above-described structure detects when the temperature inside the transformer rises from 79 ° C. to 90 ± 5 ° C. The bimetal of the bimetal switch 540 gradually bends toward the snap spring terminal 530 due to the thermal expansion coefficient and presses one side of the snap spring terminal 530.

At this time, the snap spring terminal 530 is brought into contact with the first electrode 510 finally by the pushing action of the bimetal switch 540 so that the terminal 531 is finally contacted with the first electrode 510, The first electrode 510 and the second electrode 520 are electrically connected to each other to transmit an alarm signal.

As another embodiment of the present invention, the configuration of each part of the temperature sensing apparatus for a railway transformer according to the second embodiment will be described in detail with reference to FIG. 6 is a side cross-sectional view of a temperature sensing device for a railway transformer according to a second embodiment.

According to the structure, the coupling tube 300 of the temperature sensing device 1 for a railway transformer having the above-described structure is inserted into the side wall of the first heat conduction pipe 320 at a position where the second sensor 500 is housed therein, And a first thermal conductive member 340 for direct thermal conduction to the second sensor 500.

The first thermally conductive member 340 is made of a copper plate and is inserted into a hole penetrating the side wall of the first thermally conductive pipe 320 at a position where the second sensor 500 is received, .

In addition, the space between the first thermally conductive pipe 320 and the second thermally conductive pipe 420 of the temperature sensing device 1 for a railway transformer having the above-described structure is filled with the space, And a second heat conductive member (350) for heating the heat conductive member.

The second heat conduction member 350 is a circular tube made of the same material and has a size and a thickness corresponding to the space between the first heat conduction tube 320 and the second heat conduction tube 420, The outer circumference of the second heat conduction pipe 350 is in surface contact with the inner circumference of the second heat conduction pipe 420 and the inner circumference of the second heat conduction member 350 is in surface contact with the outer circumference of the second heat conduction pipe 420.

In addition, the second heat conduction member 350 further includes a plurality of heat holes 351 formed therein so as to pass through the heat conduction.

The heat hole 351 is formed as a through hole so that the heat can be conducted more efficiently.

Accordingly, since the first and second heat conduction members 340 and 350 are provided in the thermometer 1 having the double tube structure by the first and second heat conduction tubes 320 and 420, the heat inside the transformer can be efficiently transferred to the first, 2 sensors 200 and 500 to enable precise temperature measurement and a short thermal conduction time so that it can respond to rapid temperature changes instantaneously without causing any deviation in temperature display.

As described above. While the present invention has been particularly shown and described with reference to certain preferred embodiments thereof, it is to be understood that the terminology used herein is for the purpose of describing the present invention only and is not intended to limit the scope of the claims. But is not intended to,

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be easy for anyone to know.

1; a thermometer 100;
200, a first sensor 300, a coupling tube
400, a flange body 500, a second sensor

Claims (6)

A temperature sensing device for a railway transformer,
A temperature indicator 111 fastened to the front of the scale plate 115 rotates in accordance with a change in the internal temperature of the transformer 115, A main body 100 for performing temperature display;
A first sensor (200) connected to the temperature indicator (111) and operating the temperature indicator (111) while the bimetallic coil gradually rotates when heat inside the transformer is transmitted;
A coupling tube 300 for receiving heat from the inside of the transformer while the first sensor 200 is received and fixed in a state where the first sensor 200 is inserted into the rear inside of the main body 100;
A flange body 400 for fixing a part of the first sensor 200 to the inside of the transformer while being coupled to the outer periphery of the front side of the coupling tube 300 and receiving heat inside the transformer;
And a second sensor (500) provided inside the coupling tube (300) for transmitting heat and sensing the temperature when the temperature of the coupling tube (300) rises to a specific temperature,
The first sensor 200 transmits a shutoff signal to the transformer when the limit temperature is reached, the second sensor 500 transmits a continuous alarm signal at a specific temperature interval,
The main body 100 is installed on the front surface of the scale plate 115 in the inner space of the glass plate 123. When the temperature guide 111 reaches the limit temperature of the transformer while being rotated by the first sensor 200 , And a guide contactor (110) for contacting the flow guide (113) provided adjacent to the temperature guide (111) to send a shutoff signal to the transformer by being electrically connected. Device. delete The apparatus of claim 1, wherein the pointer contactor (110) comprises:
A temperature guide 111 which is axially coupled to the front surface of the graduation plate 115 and to which one end of the first sensor 200 is connected to the center of the axis to transmit a rotational force according to a temperature change;
A first contact 112 fixedly coupled to one side of the front surface of the temperature guide 111 and rotating in the same manner as the temperature guide 111;
A flow guide 113 axially adjacently rotated in front of the temperature guide 111 for arbitrarily setting a limit temperature of the transformer;
When the temperature guide 111 rotates to reach the limit temperature of the transformer, the first contact 112 is contacted and is electrically connected to send a shutoff signal to the transformer. And a second contact (114) connected to the second contact (114). [2] The apparatus of claim 1, wherein the coupling tube (300) comprises:
A fixing pipe 310 threadedly coupled to the rear of the main body 100 and having a front portion of the first sensor 200 inserted and fixed therein;
A first heat conduction pipe 320 coupled to the inside of the fixing pipe 310 and having a rear portion of the first sensor 200 inserted and fixed therein and transmitting the internal heat of the transformer to the first sensor 200, )and;
Further comprising a coupling (330) which penetrates through the outer periphery of the fixing pipe (310) and moves back and forth, but which allows the flange pipe body (400) to be coupled by a spiral connection. The apparatus of claim 1, wherein the flange body (400) comprises:
A flange 410 fastened to the outer periphery of the coupling 330 provided on the coupling tube 300 by a spiral connection and having a first surface coupled to the transformer in a fixed state;
The first heat conduction tube 320 is inserted into the inside of the transformer while being fixed to one surface of the flange 410 so that the first heat conduction tube 320 is positioned inside the transformer, And a second heat conduction pipe (420) for transferring the temperature of the second heat conduction pipe. The apparatus of claim 1, wherein the second sensor (500) comprises:
First and second electrodes 510 and 520 shorted to each other;
The first electrode 510 and the second electrode 520 are connected to the second electrode 520 by a seesaw operation using an elastic force and a terminal 531 provided on one side contacts the first electrode 510, A snap spring terminal 530 to be electrically connected to each other;
When the temperature inside the transformer rises, one terminal of the snap spring terminal 530 is pressed by the operation using the thermal expansion coefficient of the bimetal so that the terminal 531 is connected to the first electrode 510 Further comprising a bimetal switch (540) for contacting the bimetal switch (540).
KR1020150110952A 2015-08-06 2015-08-06 Temperature indicator device for power transformer KR101611861B1 (en)

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KR20180030272A (en) * 2016-09-12 2018-03-22 인하공업전문대학산학협력단 Temperature indicator device for power transformer

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US1789548A (en) 1929-04-17 1931-01-20 John R Ross Indicator switch
US2504931A (en) 1948-07-21 1950-04-18 Lewis Eng Co Multiple temperature indicator and overtemperature alarm
US20110150027A1 (en) 2009-12-21 2011-06-23 Weiss Instruments, Inc. Mechanical and electronic temperature reading system with built-in failure and inaccuracy detection

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US1789548A (en) 1929-04-17 1931-01-20 John R Ross Indicator switch
US2504931A (en) 1948-07-21 1950-04-18 Lewis Eng Co Multiple temperature indicator and overtemperature alarm
US20110150027A1 (en) 2009-12-21 2011-06-23 Weiss Instruments, Inc. Mechanical and electronic temperature reading system with built-in failure and inaccuracy detection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180030272A (en) * 2016-09-12 2018-03-22 인하공업전문대학산학협력단 Temperature indicator device for power transformer
KR101908921B1 (en) * 2016-09-12 2018-10-18 인하공업전문대학산학협력단 Temperature indicator device for power transformer

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