KR101547645B1 - Temperature managing apparatus, temperature managing system and temperature managing method of power transformer - Google Patents

Temperature managing apparatus, temperature managing system and temperature managing method of power transformer Download PDF

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Publication number
KR101547645B1
KR101547645B1 KR1020140103469A KR20140103469A KR101547645B1 KR 101547645 B1 KR101547645 B1 KR 101547645B1 KR 1020140103469 A KR1020140103469 A KR 1020140103469A KR 20140103469 A KR20140103469 A KR 20140103469A KR 101547645 B1 KR101547645 B1 KR 101547645B1
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South Korea
Prior art keywords
temperature
transformer
measuring
value
winding
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KR1020140103469A
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Korean (ko)
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권세원
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대원전기 주식회사
운장전력 주식회사
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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/404—Protective devices specially adapted for fluid filled transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • H01F2027/406—Temperature sensor or protection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Protection Of Transformers (AREA)

Abstract

An embodiment of the present invention relates to a temperature management apparatus for a power transformer, and more specifically, a temperature management apparatus, temperature management system, and temperature management method for a power transformer capable of preventing temperature hunting phenomenon.
To this end, the temperature management device for a power transformer according to an embodiment of the present invention includes a temperature-controlled body inserted into a pocket of a power transformer and measuring a resistance value against the temperature of the insulating oil, A current measuring system for measuring a current value of a winding through at least any one of the plurality of current transformer secondary current transformers, a current measuring device for measuring an oil temperature using a resistance value with respect to the temperature of the insulating oil, A control unit for measuring the temperature of the winding, measuring the temperature of the transformer of the power transformer using the temperature of the oil and the temperature of the winding, and a display unit for digitizing and displaying the measured temperature of the transformer.

Description

TECHNICAL FIELD [0001] The present invention relates to a temperature management apparatus for a power transformer, a temperature management system, and a temperature management method for a power transformer,

Embodiments of the present invention relate to a temperature management apparatus for a power transformer, and more specifically, to a temperature management apparatus, a temperature management system, and a temperature management method for a power transformer that can prevent temperature hunting phenomenon.

The power transformer is used as a main transformer in a power plant that produces electricity and a substation that supplies power to the building by receiving power transmitted from the power plant.

In other words, most power transformers are installed in a form filled with insulating oil, and supply the necessary voltage to industrial facilities, factories, or homes by appropriately boosting or reducing AC voltage for economical transmission and distribution. The life of a power transformer depends on the temperature of the internal winding, which determines the insulation performance degradation.

The most important factor in the operation of the power transformer is to precisely measure and control the temperature of the insulation oil to compensate for the internal winding temperature, and to control various cooling devices, alarms for abnormal conditions, , It can be said that the operation of the power transformer is properly operated and the accident is prevented or the advance of the accident is prevented.

The thermometer for the power transformer measuring the temperature of the transformer is an important device for indicating the maximum temperature of the winding and the maximum temperature of the insulating oil on the upper side of the tank.

However, in the conventional thermometer for power transformer, the production cost of the power transformer is increased by measuring the winding temperature using the current transformer secondary connected to the power transformer.

In addition, a conventional thermometer for an electric power transformer is configured to mechanically display the temperature by rotating the indicating needle. Accordingly, in the conventional case, when the thermometer for an electric power transformer is used for a long time, hunting phenomenon occurs in which the instantaneous temperature rises to an abnormal temperature due to wear of components such as a drum resistor which operates the indicating needle.

As a result, the conventional thermometer for power transformer can not control the operation and stop of the cooling device precisely so that the cooling effect of the transformer can be lowered, and continuous operation of the cooling device can cause power consumption and deterioration of the cooling device.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Patent Registration No. 10-1133884 (Mar. 29, 2012) Patent Registration No. 10-0572260 (Apr. 12, 2006)

Embodiments of the present invention provide a temperature management apparatus, temperature management system, and temperature management method for a power transformer capable of preventing temperature hunting phenomenon.

Also, the embodiment of the present invention is a temperature management device for a power transformer that measures temperature of a power transformer using a sidewall, can measure a winding temperature using a current transformer for an automatic voltage corrector of a power transformer, And a temperature management method.

The embodiments of the present invention provide a temperature management apparatus, temperature management system, and temperature management method for a power transformer capable of digitizing and displaying temperature of a power transformer.

According to an embodiment of the present invention, there is provided a thermoelectric module, comprising: a temperature-sensing body inserted into a pocket of a power transformer to measure a resistance value against a temperature of the insulation oil; A current measuring unit for measuring a current value of a winding through at least any one of a plurality of current transformers secondary included in a local control panel through a current transformer secondary; A control unit for measuring an oil temperature using a resistance value of the insulating oil with respect to temperature, measuring a winding temperature using a current value of the winding, and measuring a transformer temperature of the power transformer using the oil temperature and the winding temperature; And a display unit for digitizing and displaying the measured temperature of the transformer.

In addition, the current measuring system can measure the current value of the winding through the secondary current transformer of the automatic voltage regulator among the plural secondary current transformers.

Also, the control unit may check the correction coefficient according to the oil temperature, and measure the winding temperature using the current value of the winding and the correction coefficient.

Also, at least one of the current measuring system, the control unit, and the display unit may be provided inside the local control panel.

According to another aspect of the present invention, there is provided a power transformer comprising: a power transformer filled with an insulating oil; And a temperature management device for measuring and displaying the temperature of the transformer of the power transformer, wherein the temperature management device is configured to control the temperature of the transformer based on the current value measured through the secondary current transformer connected to the power transformer, The temperature of the transformer is measured and displayed, and the auxiliary device is controlled according to the oil temperature and the accumulated average value.

The auxiliary device may further include an alarm device for outputting an alarm sound when the temperature of the transformer is higher than a reference temperature; And a cooling device for cooling the power transformer when the transformer temperature is higher than a reference temperature.

Also, the temperature management apparatus calculates a cumulative average value for the oil temperature, compares the cumulative average value and the last measured temperature to calculate a comparison value, and if the comparison value is greater than the set value, .

The temperature management device may generate an abnormal temperature generation signal including the transformer temperature if the comparison value is greater than the set value, and may transmit the abnormal temperature generation signal to a remote device that collectively manages the power transformer.

The apparatus may further include a local control panel having a plurality of current converters connected to the windings of the power transformer.

Also, the temperature management device may include a resistance meter which is inserted into a pocket located at an upper portion of the transformer and measures a resistance value with respect to the temperature of the insulating oil; A current measuring unit for measuring a current value of the winding through the secondary current transformer of the automatic voltage regulator among the plurality of secondary current transformers; A control unit for measuring an oil temperature using a resistance value of the insulating oil with respect to temperature, measuring a winding temperature using a current value of the winding, and measuring a transformer temperature using the oil temperature and the winding temperature; And a display unit for digitizing and displaying the temperature of the transformer.

In addition, the controller may operate the auxiliary device if the temperature of the transformer is higher than the reference temperature and the comparison value is less than the set value.

In another embodiment of the present invention, there is provided a method of managing temperature by a temperature management apparatus for a power transformer, comprising the steps of: measuring a resistance value with respect to a temperature of an insulating oil filled in a power transformer; Measuring a current value of a winding through a current transformer secondary of an automatic voltage regulator provided in a local control panel; Measuring an oil temperature using a resistance value against the temperature of the insulating oil; Measuring a winding temperature using a current value of the winding; Measuring the temperature of the transformer of the power transformer using the temperature of the oil and the temperature of the winding; And digitizing and displaying the temperature of the transformer.

The embodiment of the present invention can prevent the temperature hunting phenomenon by measuring the temperature of the power transformer by using the sidewall body and can measure the winding temperature by using the automatic voltage compensator of the power transformer so that the production cost of the power transformer can be reduced .

In addition, since the temperature of the power transformer can be digitized and displayed, it is possible to prevent the malfunction of the cooling device due to the aging of the mechanical parts because the mechanical parts are not used, and the operation and stoppage of the cooling device can be accurately Can be controlled.

In addition, effects obtainable or predicted by the embodiments of the present invention will be directly or implicitly disclosed in the detailed description of the embodiments of the present invention. That is, various effects to be predicted according to the embodiment of the present invention will be disclosed in the detailed description to be described later.

1 is a schematic view of a temperature management system for a power transformer according to an embodiment of the present invention.
FIG. 2 is an exemplary diagram illustrating a temperature management system for a power transformer according to an exemplary embodiment of the present invention. Referring to FIG.
3 is a diagram illustrating a local control panel of a temperature management system for a power transformer according to an embodiment of the present invention.
4 and 5 are flowcharts illustrating a temperature management method for a power transformer according to an embodiment of the present invention.
6 is a schematic view of a temperature management system for a power transformer according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an operation principle of an embodiment of a temperature management apparatus, a temperature management system, and a temperature management method for a power transformer according to the present invention will be described in detail with reference to the accompanying drawings and description. It should be understood, however, that the drawings and the following detailed description are exemplary and explanatory of various embodiments for effectively illustrating the features of the present invention. Therefore, the present invention should not be limited to the following drawings and descriptions.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terms used below are defined in consideration of the functions of the present invention, which may vary depending on the user, intention or custom of the operator. Therefore, the definition should be based on the contents throughout the present invention.

In order to efficiently explain the essential technical features of the present invention, the following embodiments will appropriately modify, integrate, or separate terms to be understood by those skilled in the art to which the present invention belongs , And the present invention is by no means thereby limited.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of a temperature management system for a power transformer according to an embodiment of the present invention, and FIG. 2 is an exemplary diagram illustrating a temperature management system for a power transformer according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a temperature management system for a power transformer (hereinafter referred to as a "temperature management system") manages the transformer temperature by measuring the transformer temperature of the power transformer 100. The temperature management system includes a power transformer 100, a local control panel 130, a temperature management device for a power transformer 200 (hereinafter referred to as a "temperature management device"), and an auxiliary device 300, .

The power transformer 100 is used as a main transformer in a power plant generating and transmitting electric power and a substation supplying power to the building by receiving power transmitted from the power plant. The inside of the power transformer (100) is filled with insulating oil. A pocket 120 into which the lateral body 210 of the temperature management device 200 is inserted is formed at an upper portion of the power transformer 100.

The local control panel 130 is provided for an operator to control the power transformer 100. The local control panel 130 may include a current transformer secondary 150 and a temperature management device 200. The local control panel 130 may further include a power switch, a distributor, a heater, a heater controller, and the like, which are not shown in FIG. 1 but that power on or off the power transformer 100.

The current transformer secondary 150 is provided inside the local control panel 130 and is connected to the current transformer (not shown) of the power transformer 100 through a connection line 140. That is, the current transformer may be provided inside the power transformer 100 and may be connected to the current transformer secondary 150 provided in the local control panel 130 through the connection line 140.

The temperature management device 200 includes the sidewall body 210 and measures the temperature of the insulating oil through the sidewall 210 and measures the transformer temperature of the power transformer 100 using the oil temperature of the insulating oil.

A detailed description of the current transformer secondary 150 and the temperature management device 200 formed in the local control panel 130 will be described with reference to FIG.

The auxiliary device 300 represents a device that the temperature management device 200 is auxiliary to control the transformer temperature of the power transformer 100. For example, auxiliary device 300 may include at least one of a cooling device 310 and an alarm device 320.

The cooling device 310 is operated to cool the power transformer 100 when the transformer temperature rises under the control of the temperature management device 200. That is, the cooling device 310 is provided at one side of the power transformer 100 to cool the insulating oil filled in the power transformer 100. For example, the cooling device 310 may include at least one of a cooling fan, a feed pump, a water cooling pump, and a cooling water spray device.

The alarm device 320 outputs an alarm sound to notify the operator that the temperature of the power transformer 100 is increased when the transformer temperature rises under the control of the temperature management device 200. The alarm device 320 may be provided inside the local control panel 130. However, the present invention is not limited to this, and the location where the alarm device 320 is provided is irrelevant if an alarm sound can be output.

3 is a diagram illustrating a local control panel of a temperature management system for a power transformer according to an embodiment of the present invention.

Referring to FIG. 3, the local control panel 130 of the temperature management system includes a current transformer secondary 150 and a temperature control device 200 for a power transformer.

The current transformer secondary 150 includes a plurality of current transformer secondary 152, 154, 156, 158, 160, 162 (collectively referred to as "150" hereinafter). At this time, the plurality of current transformer secondary 150 may include a current transformer secondary connected to the bushing of the power transformer 100, a current transformer secondary for performing the automatic voltage regulator, and the like. For example, the first to third current transformer secondary 152, 154, 156 are connected to each of the three phases of the power transformer 100, and the fourth current transformer secondary 158 is connected to the current transformer It can be secondary. Here, the fourth current transformer secondary 158 is a secondary current transformer for the automatic voltage regulator, for example, but the present invention is not limited thereto.

Although it has been described that the local control panel 130 is provided with six secondary current transformers, the present invention is not limited thereto, and if the secondary current transformers for the automatic voltage regulator are included, the number of secondary current transformers is not limited.

The temperature management device 200 includes a temperature sensor 210, a current meter 220, a signal management unit 230, a control unit 240, a display unit 250, a communication unit 260, and a storage unit 270.

The sidewall body 210 is inserted into the pocket 120 formed in the power transformer 100 to measure the resistance value against the temperature of the insulating oil. That is, the sidewall 210 varies in accordance with the temperature of the insulating oil, and measures the resistance value against the variable temperature.

The sidewall body 210 provides a resistance value to the measured temperature of the insulating oil to at least one of the signal management unit 230 and the control unit 240.

At this time, the sidewall body 210 may be a platinum side temperature body or a RTD thermometer. The sidewall body 210 is not deformed well and precise measurement is possible. The measurement range of the lateral heating body 210 can be measured from -260 ° C to 1,600 ° C.

The current measuring system 220 is connected to at least one current transformer secondary of the plurality of current transformer secondary 150 to measure a current value of the winding. That is, the current measuring unit 220 measures the current value of the internal winding of the power transformer 100 through the fourth current transformer secondary 158 for the automatic voltage regulator among the plurality of current transformer secondary 150.

The signal management unit 230 calculates the cumulative average value of the oil temperature. That is, the signal management unit 230 accumulates the predetermined number of oil temperatures for a preset time or a predetermined number of times to calculate a cumulative average value. The signal management unit 230 compares the cumulative average value and the oil temperature according to the resistance value with respect to the temperature of the insulating oil to calculate a comparison value. The signal management unit 230 determines whether the comparison value is greater than the set value in order to determine whether the hunting phenomenon has occurred due to the failure of the side body 210. If the comparison value is greater than the set value, 240).

Meanwhile, the signal management unit 230 converts the analog signal into a digital signal so that the controller 240 can process the signal. That is, the signal management unit 230 converts the resistance value of the insulating oil supplied from the sidewall 210 and the current value of the winding measured by the current measurement unit 220 into an analog signal to a digital signal, .

The control unit 240 controls the temperature of the power transformer 100 by controlling the signal management unit 230, the display unit 250, the communication unit 260, and the storage unit 270, which are components of the temperature management device 200 . For example, the control unit 240 measures the oil temperature using the resistance value against the temperature of the insulating oil. The controller 240 may measure the temperature of the insulating oil based on the resistance value provided from the sidewall body 210. On the other hand, the control unit 240 may extract the temperature matched to the resistance value provided from the sidewall 210 in the matching table, and measure the oil temperature of the insulating oil based on the resistance value against the temperature of the insulating oil. At this time, the matching table can store the resistance value matched with the temperature.

Further, the control unit 240 measures the winding temperature using the current value of the winding. At this time, the control unit 240 can check the correction coefficient according to the oil temperature, and measure the winding temperature using the correction coefficient and the current value of the winding. The reason why the correction coefficient according to the oil temperature is used when measuring the winding temperature is to measure the winding temperature accurately since the temperature of the winding is also changed according to the oil temperature.

The control unit 240 receives an error occurrence signal from the signal management unit 230 and determines whether the comparison value is larger than the set value based on the error occurrence signal. The control unit 240 determines that the hunting phenomenon has occurred if the comparison value is larger than the set value and controls the cooling device 310 and the auxiliary device 300 not to operate.

The control unit 240 measures the transformer temperature based on the oil temperature and the winding temperature, and can operate or deactivate at least one of the cooling device 310 and the alarm device 320 according to the transformer temperature. That is, the control unit 240 can operate at least one of the cooling device 310 and the alarm device 320 when the transformer temperature is higher than the reference temperature. At this time, the reference temperature for operating the cooling device 310 and the reference temperature for operating the alarm device 320 may be different.

When receiving the command signal from the remote device through the communication unit 260, the control unit 240 can control the operation of the power transformer 100 and the temperature management system according to the command signal.

The display unit 250 digitizes and displays the transformer temperature. Since the temperature management device 200 according to the embodiment of the present invention digitizes and displays the temperature of the transformer, it does not use the mechanical parts used for displaying in analog form. Therefore, the malfunction of the auxiliary device 300 due to the aging of the mechanical parts .

The communication unit 260 connects with a remote device (not shown) to transmit information to the remote device, or receives information from the remote device. That is, the communication unit 260 transmits a temperature generation signal or an abnormal temperature generation signal to the remote device under the control of the control unit 240. At this time, the communication unit 260 may transmit the temperature generation signal or the abnormal temperature generation signal to the remote device in the form of an analog signal, or may transmit the signal in the form of a digital signal to the remote device.

Here, the remote device is a device that controls and manages a plurality of power transformers 100 remotely. For example, the remote device may be a Remote Terminal Unit (RTU), an Intelligent Electronic Device (IED), or the like.

The remote device receives a temperature generation signal or an abnormal temperature generation signal from the communication unit 260 of the temperature management device 200. The remote device displays at least one of a temperature generation signal and an abnormal temperature generation signal, and can receive a command signal from an operator. At this time, the command signal may be a signal for controlling the power transformer 100 after the operator confirms the temperature generation signal or the abnormal temperature generation signal.

The storage unit 270 stores information required by the components of the temperature management device 200 and information generated by the temperature management device 200. For example, the storage unit 270 may store the oil temperature, the winding temperature, and the transformer temperature measured by the control unit 240.

The storage unit 270 may store at least one of a temperature generation signal and an abnormal temperature generation signal to be transmitted from the control unit 240 to the remote device. The storage unit 270 may store information received from the remote device.

In addition, the storage unit 270 may store various programs for controlling the overall operation of the temperature management device 200.

Meanwhile, the storage unit 270 may provide necessary information according to a request of the control unit 240, the display unit 250, and the communication unit 260. [ The storage unit 270 may be an integrated memory or may be subdivided into a plurality of memories. For example, the storage unit 270 may be a read only memory (ROM), a random access memory (RAM), a flash memory, or the like.

4 and 5 are flowcharts illustrating a temperature management method for a power transformer 100 according to an embodiment of the present invention. The components of the temperature management device 200 according to an exemplary embodiment of the present invention described above with reference to FIG. 3 may be integrated or subdivided, and may include any component that performs the above- It is possible to configure the temperature management device 200 according to an embodiment of the present invention. Therefore, in describing the method of managing the temperature of the power transformer 100 according to an embodiment of the present invention, the main body of each step will be described mainly with the temperature management device 200 not the corresponding component .

Referring to FIGS. 4 and 5, the temperature management apparatus 200 measures a resistance value with respect to the temperature of the insulating oil filled in the power transformer 100 through the sidewall 210 (S410). That is, the resistance value of the sidewall body 210 varies depending on the temperature of the insulating oil, and the variable resistance value is measured. The temperature management apparatus 200 can measure the resistance value with respect to the temperature of the insulating oil at each first measurement time. The first measurement time may be set using a predetermined algorithm (for example, a program) or may be set by an operator at will.

The temperature management apparatus 200 measures the current value of the winding through the current measuring system 220 using at least one current transformer secondary of the plurality of current transformer secondary provided in the local control panel 130 (S420) . That is, the current measuring unit 220 can measure the temperature of the windings connected to the power transformer 100 by using the current transformer secondary for the automatic voltage regulator provided in the local control panel 130. At this time, the current measuring system 220 can measure the current of the winding every second measurement time. Here, the second measurement time may be set using a predetermined algorithm (for example, a program) or may be set by an operator at will. Also, the second measurement time may be the same as the first measurement time in step S410, or may be different depending on the situation.

The temperature management apparatus 200 measures the oil temperature using the resistance value against the temperature of the insulating oil (S430). That is, the temperature management apparatus 200 can measure the oil temperature of the insulating oil according to the resistance value with respect to the temperature of the insulating oil, based on the resistance value and the relation with the temperature.

The temperature management apparatus 200 measures the winding temperature using the current value of the winding (S440). Specifically, the temperature management device 200 confirms the correction coefficient according to the oil temperature. At this time, the temperature management device 200 can monitor the relationship between the oil temperature and the winding temperature, and generate the setting coefficient table by setting the correction coefficient for each oil temperature. The temperature management apparatus 200 extracts and confirms the correction coefficient corresponding to the oil temperature measured in step S340 in the setting coefficient table. The temperature management device 200 can calculate the temperature according to the current value and measure the winding temperature using the temperature and the correction coefficient according to the current value.

The temperature management apparatus 200 measures the transformer temperature using the oil temperature and the winding temperature (S450). For example, the temperature management device 200 can measure the temperature of the transformer by adding the oil temperature and the winding temperature.

The temperature management apparatus 200 calculates a cumulative average value for the oil temperature (S460). In other words, the temperature management device 200 calculates the cumulative average value by accumulating the predetermined number of times of the oil temperature for a predetermined time or a predetermined number of times. In addition, the temperature management apparatus 200 may not include the oil temperature measured in step S430 in the cumulative average value.

Here, the cumulative average value is calculated after measuring the transformer temperature, but the present invention is not limited to this, and the order is irrelevant before calculating the comparison value.

The temperature management apparatus 200 compares the accumulated average value with the oil temperature measured last and calculates a comparison value (S470). That is, the temperature management apparatus 200 can compute the comparison value by comparing the accumulated average value with the oil temperature measured in step S430.

The temperature management apparatus 200 determines whether the comparison value is greater than the set value (S510). At this time, the set value is a value set for judging whether hunting phenomenon has occurred or not. The reason for determining whether the comparison value is larger than the set value is that the oil temperature of the insulating oil gradually rises or is maintained at a constant oil temperature, so that the oil temperature rises quickly due to the failure of the resistance measuring system, and unnecessary operation of the auxiliary device 300 .

If the comparison value is greater than the set value, the temperature management apparatus 200 deactivates the auxiliary device 300 (S520). In other words, when the comparison value is larger than the set value, the temperature management device 200 determines that the hunting phenomenon has occurred, and the auxiliary device 300 including at least one of the cooling device 310 and the alarm device 320 Non-operating.

If the comparison value is greater than the set value, the temperature management apparatus 200 generates an abnormal temperature generation signal (S530). That is, the temperature management device 200 generates an abnormal temperature generation signal including the transformer temperature if the comparison value is larger than the set value. At this time, the abnormal temperature generation signal may further include identification information for identifying the power transformer 100.

The temperature management device 200 transmits an abnormal temperature generation signal to the remote device (S540). Thereafter, the remote device receives the abnormal temperature generation signal from the temperature management device 200 and displays an abnormal temperature generation signal. At this time, the administrator who manages the remote device can determine that the side body 210 of the temperature management device 200, which has transmitted the abnormal temperature generation signal through the abnormal temperature generation signal displayed on the remote device, has failed.

If the comparison value is smaller than the set value, the temperature management apparatus 200 determines whether the transformer temperature is higher than the reference temperature (S550). At this time, the reference temperature is a temperature at which it is determined that an abnormality has occurred in the transformer, and the reference temperature may be set differently depending on the type of the power transformer 100.

The temperature management device 200 activates the auxiliary device 300 if the transformer temperature is higher than the reference temperature (S560). The temperature management device 200 operates the cooling device 310 to freeze the power transformer 100 if the transformer temperature is greater than the reference temperature and outputs an alarm sound to notify that the power transformer 100 has experienced an error The alarm device 320 can be operated. Thereafter, the temperature management device 200 stops the operation of the auxiliary device 300 when the temperature of the transformer becomes lower than the reference temperature.

The temperature management device 200 transmits a temperature generation signal including the transformer temperature to the remote device (S570). At this time, the temperature generation signal may include identification information for identifying the power transformer 100. [

6 is a schematic view of a temperature management system for a power transformer according to another embodiment of the present invention.

Referring to FIG. 6, a temperature management system for a power transformer 100 includes a power transformer 100, a cooling device 310, an alarm device 320, and a temperature management device 600.

The temperature management apparatus 600 includes a thermometer 610, a current meter 620, a cylinder 630, a control unit 650, a signal management unit 660, a display unit 670, and a communication unit 680.

The thermometer 610 is inserted into the insertion groove 170 to measure the temperature of the insulating oil filled in the power transformer 100. [

The current measuring system 620 detects the current value flowing through the winding inside the power transformer 100 through the secondary 110 of the power transformer for winding temperature connected to the power transformer 100.

The cylinder 630 expands or contracts by changing the temperature of the material (e.g., air) filled therein by the temperature measured by the thermometer 610 and the current measured by the current meter 620. Thus, the piston of the cylinder 630 performs a linear stroke movement, so that the variable resistor 640 is varied in accordance with the stroke variation.

The controller 650 controls the thermometer 610, the current meter 620, the signal manager 660, the display unit 670, and the communication unit 680, which are components of the temperature management apparatus 600.

In addition, the controller 650 measures the transformer temperature based on the variable resistance value varied by the current values of the oil temperature and the windings.

The control unit 650 controls at least one of the cooling device 310 and the alarm device 320 according to the transformer temperature. That is, the control unit 650 can operate at least one of the cooling device 310 and the alarm device 320 when the transformer temperature is higher than the reference temperature.

The control unit 650 receives an error occurrence signal from the signal management unit 660 and determines that a failure has occurred in the thermometer 610 based on the error occurrence signal. If the transformer temperature is higher than the reference temperature, the control unit 650 stops the operation of the cooling device 310 and the alarm device 320 upon receiving the error occurrence signal from the signal management unit 660.

The signal management unit 660 calculates a cumulative average value of the oil temperature in order to prevent an error in the transformer temperature due to the failure of the thermometer 610. That is, the signal management unit 660 accumulates the predetermined number of times of the oil temperature for a preset time or a predetermined number of times to calculate a cumulative average value.

The signal management unit 660 compares the cumulative average value and the oil temperature to calculate a comparison value, and determines whether the comparison value is greater than the set value. If the comparison value is greater than the set value, the signal management unit 660 generates an error occurrence signal and provides the error generation signal to the control unit 650.

In addition, the signal management unit 660 may convert the transformer temperature to a digital signal.

The display unit 670 digitizes and displays the transformer temperature. In the prior art, since the transformer temperature is indicated through the indicating needle, the parts are worn out and the accurate transformer temperature can not be displayed. However, since the present invention digitally displays the transformer temperature, the parts can be prevented from being worn, Can be displayed.

The communication unit 680 connects with the remote device and transmits information to the remote device or receives information from the remote device. That is, the communication unit 680 can transmit the information about the transformer temperature measured by the control unit 650 to the remote device in the form of an analog signal or a digital signal.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: Power transformer
150: Current transformer secondary
200: Temperature management device
210: side body
220: Current meter
230:
240:
250:
300: auxiliary device
310: Cooling unit
320: Alarm device

Claims (16)

A side body inserted into the pocket of the power transformer and measuring a resistance value against the temperature of the insulating oil;
A current measuring unit for measuring a current value of a winding through at least any one of a plurality of current transformers secondary included in a local control panel through a current transformer secondary;
A control unit for measuring an oil temperature using a resistance value of the insulating oil with respect to temperature, measuring a winding temperature using a current value of the winding, and measuring a transformer temperature of the power transformer using the oil temperature and the winding temperature; And
A display unit for digitizing and displaying the measured transformer temperature;
Lt; / RTI >
The current measuring system measures the current value of the winding through the secondary current transformer of the automatic voltage regulator among the plurality of secondary current transformers,
Wherein the control unit checks the correction coefficient according to the oil temperature and measures the winding temperature using the current value of the winding and the correction coefficient. delete delete The method according to claim 1,
Wherein at least one of the current measuring system, the control unit, and the display unit is provided inside the local control panel. A power transformer filled with insulating oil inside; And
A temperature management device for measuring and displaying the transformer temperature of the power transformer;
, ≪ / RTI &
Further comprising a local control panel having a plurality of current transformers secondary connected to the windings of the power transformer,
The temperature management device
A resistance measuring instrument inserted into a pocket located at an upper portion of the transformer and measuring a resistance value with respect to the temperature of the insulating oil;
A current measuring unit for measuring a current value of the winding through the secondary current transformer of the automatic voltage regulator among the plurality of secondary current transformers;
Measuring an oil temperature using a resistance value of the insulating oil with respect to temperature, measuring a winding temperature using a current value of the winding, measuring a transformer temperature using the oil temperature and the winding temperature, Calculating a mean value, calculating a comparison value by comparing the cumulative average value with the last measured oil temperature, and deactivating the auxiliary device if the comparison value is greater than the set value; And
And a display unit for digitizing and displaying the temperature of the transformer. 6. The method of claim 5,
The auxiliary device
An alarm device for outputting an alarm sound when the temperature of the transformer is higher than a reference temperature; And
And a cooling device for cooling the power transformer when the transformer temperature is higher than a reference temperature. delete 6. The method of claim 5,
The temperature management device
And generates an abnormal temperature generation signal including the transformer temperature if the comparison value is greater than a set value, and transmits the abnormal temperature generation signal to a remote device that collectively manages the power transformer. delete delete 6. The method of claim 5,
Wherein the controller operates the auxiliary device if the transformer temperature is higher than the reference temperature and the comparison value is less than the set value. A method for managing temperature in a temperature management apparatus for a power transformer,
Measuring a resistance value with respect to the temperature of the insulating oil filled in the power transformer;
Measuring a current value of a winding through a current transformer secondary of an automatic voltage regulator provided in a local control panel;
Measuring an oil temperature using a resistance value against the temperature of the insulating oil;
Measuring a winding temperature using a current value of the winding;
Measuring the temperature of the transformer of the power transformer using the temperature of the oil and the temperature of the winding;
Digitizing and displaying the transformer temperature;
Calculating a cumulative average value of the insulating oil with respect to the oil temperature;
Calculating a comparison value by comparing the cumulative average value with the last measured oil temperature;
Determining whether the comparison value is greater than a set value; And
Deactivating the alarm and the cooling device if the comparison value is greater than the set value;
Lt; / RTI >
The step of measuring the winding temperature
Confirming a correction coefficient according to the oil temperature; And
Measuring the winding temperature using the current value of the winding and the correction coefficient;
And the temperature of the power transformer. delete delete 13. The method of claim 12,
After the step of determining whether the comparison value is larger than the set value,
Generating an abnormal temperature generation signal including the transformer temperature if the comparison value is greater than the set value; And
Transmitting the abnormal temperature generation signal to a remote device collectively managing the power transformer;
Further comprising the steps of: 13. The method of claim 12,
After measuring the transformer temperature,
Determining if the transformer temperature is higher than a reference temperature if the comparison value is less than the set value; And
And operating at least one of an alarm and a cooling device when the transformer temperature is higher than a reference temperature.
KR1020140103469A 2014-08-11 2014-08-11 Temperature managing apparatus, temperature managing system and temperature managing method of power transformer KR101547645B1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105258819A (en) * 2015-10-22 2016-01-20 杭州鸿程科技有限公司 Transformer temperature monitoring device
CN107560757A (en) * 2017-09-05 2018-01-09 浙江群力电气有限公司 A kind of air-cooled transformer upper strata oil temperature predictor method and system
KR20180076632A (en) * 2016-12-28 2018-07-06 경북대학교 산학협력단 Intelligent protection apparatus of transformer and method for protecting the same
CN111426404A (en) * 2020-04-06 2020-07-17 甘书宇 Transformer temperature measuring system and measuring method
CN112986730A (en) * 2021-02-08 2021-06-18 国网内蒙古东部电力有限公司呼伦贝尔供电公司 Distribution transformer handover test movable detection device suitable for extremely cold environment
CN113686459A (en) * 2021-08-24 2021-11-23 中国第一汽车股份有限公司 Oil temperature measuring device, control method and vehicle

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105258819A (en) * 2015-10-22 2016-01-20 杭州鸿程科技有限公司 Transformer temperature monitoring device
KR20180076632A (en) * 2016-12-28 2018-07-06 경북대학교 산학협력단 Intelligent protection apparatus of transformer and method for protecting the same
KR101919875B1 (en) * 2016-12-28 2019-02-08 경북대학교 산학협력단 Intelligent protection apparatus of transformer and method for protecting the same
CN107560757A (en) * 2017-09-05 2018-01-09 浙江群力电气有限公司 A kind of air-cooled transformer upper strata oil temperature predictor method and system
CN111426404A (en) * 2020-04-06 2020-07-17 甘书宇 Transformer temperature measuring system and measuring method
CN112986730A (en) * 2021-02-08 2021-06-18 国网内蒙古东部电力有限公司呼伦贝尔供电公司 Distribution transformer handover test movable detection device suitable for extremely cold environment
CN113686459A (en) * 2021-08-24 2021-11-23 中国第一汽车股份有限公司 Oil temperature measuring device, control method and vehicle

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