KR20170114216A - Apparatus for detecting abnormality of mold transformer - Google Patents

Abstract

An object of the present invention is to provide an abnormality detecting apparatus for a mold transformer capable of performing real-time state monitoring, abnormal state detection, and partial discharge occurrence position estimation of a mold transformer.
The mold transformer abnormality detection apparatus according to an embodiment of the present invention includes a plurality of partial discharge detection sensors installed inside an enclosure accommodating a transformer body and sensing a propagation signal due to a partial discharge generated in the transformer body, The plurality of partial discharge detection sensors are disposed at different positions.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for detecting an abnormality of a mold transformer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting apparatus for a mold transformer, and more particularly to an abnormality detecting apparatus for a mold transformer capable of detecting a partial discharge occurring in a mold transformer.

The mold transformer is a transformer fabricated by molding a heat resistant epoxy resin to eliminate the risk of fire and explosion in case of accident, which is the main disadvantage of the inflow transformer.

Generally, a mold transformer is composed of a conductor winding, an epoxy, a core, and various supporting members that largely conduct current.

However, such a mold transformer may cause an initial partial discharge due to poor insulation or deterioration due to aging deterioration, and depending on the use time, such a partial discharge may weaken the dielectric strength and lead to a large-scale accident .

Particularly, a mold transformer can cause defects such as voids or foreign substances in a process of manufacturing an insulation molding, and the electric discharge deteriorates at the defective portion during long-term use.

However, the mold transformer is disadvantageous in that it is not easy to accurately measure and monitor the deterioration and the partial discharge generated in the interior due to the structural characteristics of the winding surrounded by the insulator. Therefore, in order to diagnose the state of the mold transformer, the state of the mold transformer is diagnosed when the inspector has a period of maintenance or there is a sign of deterioration problem by using a connection type partial discharge sensor and a thermal measuring instrument. There is a problem that proper response can not be obtained, and there is a problem that it is impossible to predict the accurate life of the mold transformer.

In addition, the conventional connection type partial discharge sensor has a disadvantage in that it can measure the partial discharge but can not estimate the position where the partial discharge occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to at least partially solve the problems of the prior art as described above. In one aspect of the present invention, there is provided an abnormality detection method for a mold transformer capable of real time monitoring of a mold transformer, And an object of the present invention is to provide a device.

In order to attain at least part of the above objects, the present invention includes a plurality of partial discharge detection sensors installed inside an enclosure accommodating a transformer body and sensing a propagation signal due to a partial discharge generated in the transformer body And the plurality of partial discharge detection sensors are disposed at different positions.

Further, the mold transformer abnormality detection apparatus according to an embodiment of the present invention includes a data processing section for receiving and processing partial discharge data sensed by the partial discharge detection sensor, and the data processing section includes a plurality of partial discharge detection sensors The position of the partial discharge generated in the transformer body can be calculated based on the partial discharge data detected by the partial discharge data.

Further, in one embodiment, the plurality of partial discharge detection sensors are constituted by a first partial discharge detection sensor and a second partial discharge detection sensor, and the data processing section includes a first partial discharge detection sensor and a second partial discharge detection sensor, The position of the partial discharge can be calculated using the triangulation method based on the maximum signal magnitude position value of the partial discharge sensed by the partial discharge.

In one embodiment, the data processing unit generates partial discharge occurrence tendency data based on the magnitude of the partial discharge sensed by the plurality of partial discharge detection sensors and the number of discharges, and outputs the partial discharge occurrence tendency data to a predetermined portion The type of the partial discharge can be determined by comparing with the discharge pattern data.

Further, in one embodiment, the first partial discharge detection sensor and the second partial discharge detection sensor can be disposed at positions where they can sense the entire three-phase windings of the transformer body independently of each other.

Also, in one embodiment, the partial discharge detection sensor may include a UHF (Ultra High Frequency) antenna.

Further, in one embodiment, the partial discharge detection sensor may be configured to measure a frequency range of 0.3 GHz to 1.8 GHz.

Further, in one embodiment, the partial discharge detection sensor may be configured to be capable of tilting operation so that the receiving section that receives the radio wave signal can change the direction.

Also, in one embodiment, the partial discharge detection sensor may have a supergain so that the amount of the radio waves radiated in the directions other than the direction in which the receiving unit is facing is minimized.

Further, in an embodiment, the partial discharge detection sensor may include a radio wave shielding member surrounding the side and rear of the receiving portion.

Further, in one embodiment, the radio wave shielding member may be configured in a polyhedral shape so that diffuse reflection is minimized.

Further, in one embodiment, the data processing unit may display an abnormal state occurrence alarm to the transformer monitoring system or the terminal when detecting the partial discharge in the plurality of partial discharge detection sensors.

Further, the mold transformer abnormality detection apparatus according to an embodiment of the present invention may further include a current sensor for measuring a magnitude of an operation current supplied to the transformer, and the data processing unit may include: It is possible to determine whether or not the partial discharge caused by the defect is caused by comparing the variation of the signal and the variation of the noise signal due to the variation of the operation current.

According to an embodiment of the present invention having such a configuration, the partial discharge of the mold transformer can be measured in real time, and the measured value can be comprehensively compared and analyzed to obtain an effect that the defect of the mold transformer can be accurately detected .

FIG. 1 is a side view schematically showing an example in which a mold transformer abnormality detecting apparatus according to an embodiment of the present invention is applied to a mold transformer.
Fig. 2 is a front view schematically showing an example in which the mold transformer abnormality detecting apparatus shown in Fig. 1 is applied to a mold transformer. Fig.
3 is a diagram showing an example for implementing the directivity of the partial discharge detection sensor included in the mold transformer abnormality detection apparatus shown in FIG.
4 is a view schematically showing a method of estimating a defect position through a mold transformer abnormality detecting apparatus according to an embodiment of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Furthermore, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

A mold transformer abnormality detecting apparatus according to various embodiments of the present invention will be described with reference to Figs. 1 and 2. Fig.

≪ Embodiment 1 >

First, a mold transformer abnormality detecting apparatus according to the first embodiment of the present invention includes a plurality of thermo image sensors 111 to 114, a current sensor (not shown), a temperature resistance temperature sensor (not shown) and a data processor (not shown) . ≪ / RTI >

The thermal image sensors 111 to 114 are provided inside the enclosure 20 in which the transformer body 10 is housed to measure the outside temperature of the transformer body 10 at all times. Here, the transformer body 10 corresponds to a center of a transformer including an iron core, a low-voltage winding, a high-voltage winding, a clamp, a molding layer, and a winding terminal.

In one embodiment, the thermal image sensors 111-114 may be configured with an infrared array sensor that can image a portion of the exterior of the transformer body 10 and image the temperature distribution of the imaging site. Here, the infrared array sensor can take out the infrared ray emitted from the measurement object and output the temperature distribution data.

For example, the thermal image sensors 111 to 114 may be configured to measure temperatures within a range of 0 ° C to 200 ° C, but the present invention is not limited thereto.

Further, the thermal image sensors 111 to 114 can transmit the measured temperature distribution data to a data processing unit to be described later.

In one embodiment, each of the plurality of thermal image sensors 111 to 114 may divide a predetermined area of the transformer body 10 into a plurality of unit areas to measure the temperature per unit area.

That is, since the range in which one thermal image sensor 111 to 114 can be measured in a fixed state is limited, one thermal image sensor 111 to 114 can detect a wide surveillance region assigned to itself by a plurality of units And measure the temperature per unit area through time control.

To this end, in one embodiment, the thermal image sensors 111 to 114 are configured to be capable of tilting in the vertical direction and the lateral direction so that a plurality of unit areas can be measured for each unit area as shown in FIGS. 1 and 2 .

Since the thermal image sensors 111 to 114 capable of tilting operation can adjust the shooting angle, a predetermined wide area can be divided into a plurality of unit areas and measured.

Here, the mechanical structure for implementing the tilting operation of the thermal image sensors 111 to 114 is not particularly limited, and various known automatic rotation structures may be applied.

On the other hand, in one embodiment, the thermal image sensors 111 to 114 include a first thermal image sensor 111, a second thermal image sensor 112, a third thermal image sensor 113 and a fourth thermal image sensor 114 ).

Here, each of the first thermal image sensor 111, the second thermal image sensor 112, and the third thermal image sensor 113 may be disposed so as to correspond one-to-one to the windings of respective phases provided in the transformer body 10 .

Each of the first thermal image sensor 111, the second thermal image sensor 112 and the third thermal image sensor 113 is assigned to the predetermined area with the corresponding phase winding and winding peripheral structure, Can be divided into a plurality of unit areas as described above to measure the temperature per unit area.

The fourth thermal image sensor 114 may be provided on the upper portion or the lower portion of the inside of the enclosure 20 to measure the surface temperature of the transformer body 10 and the temperature around the transformer body 10. [

The fourth thermal image sensor 114 may be provided to detect a temperature change occurring inside the enclosure 20 due to rodents and foreign matter that may enter the inside of the enclosure 20 and external environmental factors.

On the other hand, in one embodiment, the thermal image sensors 111 to 114 can sequentially measure the temperatures of the plurality of unit areas in accordance with a preset normalcy period.

In one embodiment, the steady-state period may be set to a multiple of the load fluctuation period of the transformer. For example, when the load fluctuation of the transformer is detected at a cycle of 15 minutes, if the load fluctuation is not severe, one of the thermal image sensors 111 to 114 is configured to measure the temperature of the entire predetermined region at a cycle of twice or more than 15 minutes And when the load fluctuation is severe, one of the thermal image sensors 111 to 114 may be configured to measure the temperature of the entire predetermined region at a cycle of 15 minutes in accordance with the load fluctuation period.

Further, when a deteriorated area having a temperature variation amount equal to or higher than a predetermined normal value occurs among the plurality of unit areas, the thermal image sensors 111 to 114 are configured to measure the deteriorated area and the unit area around the deteriorated area according to a predetermined abnormal cycle . Here, it is preferable that the abnormal period is set shorter than the normal period.

For example, when the normal cycle is set to twice the 15-minute load cycle, when a deteriorated area occurs, the unit areas around the deteriorated area and the deteriorated area can be measured at a cycle of 15 minutes as a load fluctuation cycle. In this manner, the operation of measuring a unit area of a plurality of unit areas in a shorter period can be implemented by adjusting the measurement priority of the thermal image sensors 111 to 114. That is, while the area where the deterioration does not occur is measured once, the deteriorated area and the unit areas around the deteriorated area can be measured twice.

For reference, the normal value of the temperature change amount can be set in accordance with the mold transformer temperature rise specification.

The current sensor (not shown) is installed in a clamp form on the secondary current side of a current transformer (CT) for current measurement installed on the primary side or the secondary side of the transformer and measures the magnitude of the operation current supplied to the transformer . Such a current sensor can transmit the magnitude of the measured operation current to a data processing unit to be described later.

The RTD temperature sensor (not shown) may measure the internal temperature of the transformer body 10. For example, the temperature-measuring resistance temperature sensor is constituted by a contact-type temperature sensor provided inside the low-voltage winding of each phase provided in the transformer body 10, and when the secondary-side coil voltage is 1,000 V or more, The flow can be configured in a smooth position. The temperature-measuring-resistance temperature sensor can measure the amount of temperature change inside the transformer body 10 according to the magnitude of the operation current, and can transmit the measured amount of temperature change inside the transformer body 10 to a data processing unit to be described later.

The data processing unit (not shown) can receive and analyze surface temperature distribution data of the transformer body 10 measured by the thermal image sensors 111 to 114.

In one embodiment, the data processing unit may display an abnormal condition occurrence alarm in the transformer monitoring system or the terminal when a deteriorated area occurs in a plurality of unit areas with a temperature variation amount equal to or higher than a preset normal value.

Further, the data processing section can generate the temperature distribution map of the transformer body 10 as shown in Fig. 4 based on the temperature distribution data. Here, in the temperature distribution map, the amount of temperature change per unit area is displayed.

Further, in one embodiment, the data processing section may be configured to substitute the temperature distribution data of the transformer body 10 measured by the thermal image sensors 111 to 114 into the Arrhenius theory of IEEE Std C57.12.56-1986, Calculations can be performed and the expected lifetime of the transformer derived by calculation can be displayed on the transformer monitoring system or terminal.

For example, if the maximum temperature of the transformer operating temperature is set to 55 ° C, the expected lifetime of the transformer through the Arrhenius Theory of IEEE Std C57.12.56-1986 can be calculated by Equation 1 below.

Where life (h) is the expected life, T is the hotspot absolute temperature (transformer ambient temperature + transformer winding temperature + hot spot correction temperature + 273 ° C).

Further, in one embodiment, the data processing section may calculate normal transformer temperature data due to the change in operation current based on the temperature distribution data measured by the thermal image sensors 111 to 114 and the magnitude of the operation current measured by the current sensor, It is possible to detect whether the transformer body 10 has undergone deterioration by comparing the distribution data.

For example, the data processing unit combines the temperature outside the transformer body 10 measured by the thermal image sensors 111 to 114 and the magnitude of the operation current measured by the current sensor, so that the temperature rise of the transformer body 10 It can be judged whether the temperature is normally raised by the current rise or if the temperature is abnormally raised by the deterioration.

At this time, if it is determined that the deterioration has occurred, the data processing unit can display an abnormal state alarm to the transformer monitoring system or the terminal as described above. The user can display an image of the temperature distribution map output to the screen of the transformer monitoring system or the terminal screen The position of the deteriorated area can be grasped.

Further, in one embodiment, the data processing section compares the temperature data inside the transformer body 10 measured by the RTD temperature sensor and the temperature distribution data outside the transformer body 10 measured by the thermal image sensors 111 to 114 It is possible to detect whether or not deterioration of the transformer body 10 has occurred.

For example, the data processing unit can determine that the temperature change inside the transformer body 10 does not change outside the transformer body 10 due to the increase of the operation current and the normal temperature change due to the increase of the operation current, Temperature change of the voltage-adjusting tap changing bolt portion located at the middle of the high voltage lead-out portion located at the upper and lower portions of the transformer body 10 and the temperature change of the transformer body 10 ) The case where the temperature of the outer surface rises can be judged as the occurrence of deterioration due to the abnormal state.

The mold transformer abnormality detecting apparatus according to the first embodiment of the present invention as described above can detect abnormality of the transformer body 10 in real time using the thermal image sensors 111 to 114 provided in the transformer, And the deterioration of the transformer can be detected by integrating the measured values measured by the respective sensors.

In addition, since the mold transformer abnormality detecting apparatus according to the first embodiment of the present invention is configured such that one thermal image sensor 111 to 114 can photograph various portions of the transformer body 10 while tilting, There is an advantage that the constraint is small and the cost of the apparatus is reduced.

In addition, the mold transformer abnormality detection apparatus according to the first embodiment of the present invention has an advantage that the deterioration occurrence region can be accurately detected through the temperature sensor composed of four channels of the first to fourth thermal image sensors 114 .

≪ Embodiment 2 >

The mold transformer abnormality detection apparatus according to the second embodiment of the present invention may include a plurality of partial discharge detection sensors 121 and 122, a current sensor (not shown) and a data processing unit (not shown).

1 and 2, the plurality of partial discharge detection sensors 121 and 122 are installed inside the enclosure 20 to detect a radio wave signal due to a partial discharge generated in the transformer body 10 .

In addition, the current sensor can measure the operation current supplied to the transformer as described above in the description of the first embodiment of the present invention.

The data processor may determine whether a partial discharge is generated based on the partial discharge data sensed by the plurality of partial discharge sensors 121 and 122 and the operation current measured by the current sensor.

The partial discharge detection sensors 121 and 122 may be configured to include a UHF (Ultra High Frequency) antenna 120a. The partial discharge detection sensors 121 and 122 may be configured to detect a partial discharge The frequency range of the radio wave signal generated by the radio frequency signal measuring unit may be 0.3 GHz to 1.8 GHz. However, the present invention is not limited thereto.

Also, in an embodiment of the present invention, the plurality of partial discharge detection sensors 121 and 122 may be disposed at different positions as shown in FIG.

The partial discharge detection sensors 121 and 122 disposed at different positions can detect the partial discharge generated in the transformer body 10 at different positions to enable the positional tracking of the partial discharge.

That is, the data processing unit can calculate the position of the partial discharge generated in the transformer body 10 based on the partial discharge data sensed by each of the plurality of partial discharge detection sensors 121, 122.

In one embodiment, the partial discharge detection sensors 121 and 122 may be composed of a first partial discharge detection sensor 121 and a second partial discharge detection sensor 122. [

Here, it is preferable that the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 are disposed at positions where they can sense the entire three-phase windings of the transformer body 10 independently of each other.

1, the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 are disposed at the upper or lower end of the inside of the enclosure 20 in the forward or backward direction or in the leftward or rightward direction But is not limited thereto.

In such a configuration, the data processing section generates a partial discharge using the triangulation method based on the maximum signal magnitude position value of the partial discharge sensed by the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 The position can be calculated accurately.

Further, in one embodiment, the data processing section generates a partial discharge distribution map of the transformer body 10 based on the partial discharge data sensed by the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 can do. Here, the generated partial discharge distribution map may be imaged and output to the screen of the transformer monitoring system or the terminal screen.

The first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 can be configured to be able to perform a tilting operation so that the direction of the receiving unit 125b receiving the radio wave signal can be switched. Thus, the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 can sense a radio wave signal emitted from various portions of the transformer body 10, respectively.

The first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 may be disposed in a direction other than the direction in which the receiving portion 125b at the front end is opposite to that of the receiving portion 125b Directional compatibility so that the amount of radio waves radiated from the rear is minimized.

3, the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 are connected to the receiving portion 125b of the UHF antenna 125A, And a radio wave shielding member 127 surrounding the side and the rear of the radio wave shielding member 127.

The radio wave shielding member 127 is composed of a material having a radio wave shielding performance surrounding the side and the rear of the UHF antenna 125A except for the receiving portion 125b and is provided with a first partial discharge detection sensor 121 and a second partial discharge detection sensor It is possible to impart the directivity to the antenna 122.

If irregular reflection occurs in the radio wave shielding member 127, there may arise a problem that the irregularly reflected radio waves are received by the other partial discharge detection sensors 121 and 122. In this way, the partial discharge detection sensors 121 and 122, The accuracy of partial discharge detection is lowered.

Therefore, in one embodiment, it is preferable that the radio wave shielding member 127 is configured in a polyhedral shape so as to minimize irregular reflection. For example, the electromagnetic wave shielding member 127 may have a rectangular parallelepiped shape in which the receiving portion 125b of the UHF antenna 125A is exposed as shown in FIG. 3, but the present invention is not limited thereto.

The first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 having the supergain characteristics have the capability of distinguishing noise signals (such as field noise and radio waves from other power devices) generated from the outside It has the advantage of being excellent.

On the other hand, the data processing unit can generate the partial discharge distribution map by combining the signal magnitude and pattern of the radio wave of each part of the transformer body 10, and calculate the size of the partial discharge and the number of discharges by combining the partial discharge distribution maps by time The tendency of occurrence of the partial discharge can be analyzed.

In addition, the data processing unit can determine whether an accident occurred in the transformer body 10 by using the tendency data of the partial discharge.

In addition, since the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 have directivity as described above, it is possible to detect a portion where the signal amplitude of the radio wave is relatively large.

In other words, the smaller the arrival distance of the radio wave is, the larger the size of the signal. Therefore, each of the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 can detect the position have.

At this time, the data processing section performs a partial discharge in the transformer body 10 using the triangulation method based on the maximum signal size position value sensed by the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122, It is possible to accurately track the position where it occurred.

On the other hand, the data processor generates partial discharge occurrence tendency data based on the magnitude of the partial discharge sensed by the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 and the number of discharges, Data can be compared with predetermined partial discharge pattern data to determine the type of partial discharge (particle, corona, void, floating, etc.).

Further, when the data processing unit detects partial discharge at the plurality of partial discharge detection sensors 121 and 122, it may display an abnormal condition occurrence alarm to the transformer monitoring system or the terminal.

Further, in one embodiment, the data processing section can increase the judgment accuracy of the partial discharge by comparing the variation of the partial discharge signal measured by the partial discharge detection sensors 121, 122 with the variation of the noise signal due to the variation of the operation current. That is, the data processing section can determine whether or not the variation of the partial discharge signal is a partial discharge caused by a defect based on the variation of the noise signal.

Generally, the magnitude of the operation current has a low correlation with the change of the partial discharge signal, and the frequency of the operation current is highly correlated with the change of the partial discharge signal. Therefore, the data processing unit can compare the variation of the noise signal and the variation of the partial discharge signal due to the variation of the operation current, and determine whether a partial discharge due to the defect is generated or not.

Also, the data processing unit may display the size and position of the determined partial discharge on the screen of the central monitoring system or the screen of the terminal.

The mold transformer abnormality detection apparatus according to the second embodiment of the present invention as described above can accurately determine the position where the partial discharge is generated through the plurality of partial discharge detection sensors 121 and 122 that are supergiant and tilting .

≪ Third Embodiment >

The mold transformer abnormality detection apparatus according to the third embodiment of the present invention includes the plurality of thermal image sensors 111 to 114 and the plurality of partial discharge detection sensors 121 and 122, A sensor and a data processing unit.

Here, the current sensor and the RTD temperature sensor are substantially the same as those of the current sensor and the RTD temperature sensor described above in the description of the first and second embodiments of the present invention, and a detailed description thereof will be omitted.

The configuration and operation of the plurality of thermal image sensors 111 to 114 and the plurality of partial discharge detection sensors 121 and 122 are substantially the same as those described in the description of the first and second embodiments of the present invention A detailed description thereof will be omitted. In the following description, the values measured by the plurality of thermal image sensors 111 to 114 and the plurality of partial discharge sensors 121 and 122 are combined to detect a partial discharge The operation will be described.

The mold transformer abnormality detection apparatus according to the third embodiment of the present invention detects the external temperature and partial discharge of the transformer body 10 through the plurality of thermal image sensors 111 to 114 and the plurality of partial discharge detection sensors 121 and 122, Can be measured simultaneously in real time.

In one embodiment, the plurality of thermal image sensors 111 to 114 include a first thermal image sensor 111, a second thermal image sensor 112, and a third thermal image sensor 111, which correspond to the windings of respective phases provided in the transformer body 10 on a one- A third thermal image sensor 113 and a fourth thermal image sensor 114 provided in an upper portion or a lower portion of the inside of the enclosure 20.

Further, in one embodiment, the partial discharge detection sensors 121 and 122 may be configured to include a first partial discharge detection sensor 121 and a second partial discharge detection sensor 122 disposed at different positions.

In this configuration, the data processing unit can generate the temperature distribution map of the transformer body 10 by combining the temperature data of the transformer body 10 measured by the thermal image sensors 111 to 114, The map can be analyzed to determine whether local overheating has occurred in the transformer body 10 and the location of local overheating.

The data processor may generate a partial discharge distribution map by combining the partial discharge signal magnitudes of the transformer body 10 measured by the partial discharge detection sensors 121 and 122.

3, the data processing unit may compare the temperature distribution map and the partial discharge distribution map to detect the generation time, position, and type of defects occurring in the transformer body 10. [

Here, the generation position of the partial discharge is determined by the tilting position of the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 in the up and down and left and right directions and the measured partial discharge value Can be obtained through triangulation as a basis.

The types of partial discharges include partial discharge generation tendency data generated based on the magnitude of the partial discharge sensed by the first partial discharge detection sensor 121 and the second partial discharge detection sensor 122 and the number of discharges, Can be detected in comparison with the discharge pattern data.

Also, the data processing section determines whether the temperature change and the partial discharge change in the transformer body 10 are changes according to the operation state change of the transformer or the change according to the progress of the defect, based on the magnitude and frequency of the operation current measured by the current sensor It can be judged.

For reference, the temperature change of the transformer body 10 is highly correlated with the magnitude of the operation current, while the magnitude of the partial discharge is highly correlated with the frequency change of the operation current and is low in correlation with the magnitude of the operation current.

Therefore, the mold transformer abnormality detecting apparatus according to the third embodiment of the present invention can accurately calculate the defects occurring in the transformer body 10 and the service life of the transformer body 10 based on the change of the operation current.

Further, the data processing section can display an abnormal condition occurrence alarm to the transformer monitoring system or the terminal when it is determined that the temperature change and the partial discharge change in the transformer body 10 are changes due to defects.

Also, the data processing section obtains the internal temperature data of the transformer body 10 measured by the RTD temperature sensor, the operation current change amount measured by the current sensor, and the measured values of the first to fourth thermal image sensors 111 to 114 It is possible to detect whether or not deterioration of the transformer body 10 has occurred by comparing the temperature distribution map and the partial discharge distribution maps obtained through the measured values of the first and second partial discharge sensors 121 and 122. [

For example, the data processing section determines that deterioration due to a defect occurs when there is no change in the operation current and the temperature inside the transformer body 10 is not changed but a partial discharge occurs and the temperature of a partial region of the transformer body 10 rises Even when the amount of change in the partial discharge and the amount of change in temperature outside the transformer body 10 exceed the reference value in comparison with the amount of change in the operation current and the amount of change in the temperature inside the transformer body 10, Alternatively, even if the temperature inside the transformer body 10 rises, it can be determined that the normal state corresponds to the change of the operation current, if the partial discharge change amount and the temperature change amount in the transformer body 10 are not present.

Further, in one embodiment, the data processing section stores the temperature distribution data of the transformer body 10 measured by the first to fourth thermal image sensors 111 to 114 in the IEEE Std C57 12.56-1986 to calculate the life expectancy of the transformer, and the expected lifetime of the transformer derived by calculation can be displayed on the transformer monitoring system or terminal.

The mold transformer abnormality detection apparatus according to the third embodiment of the present invention as described above is capable of detecting the temperature of the transformer body 10 in real time through the plurality of thermal image sensors 111 to 114 and the plurality of partial discharge detection sensors 121 and 122, The temperature of the transformer can be monitored and the life of the transformer can be predicted by combining the operating current measured by the current sensor and the temperature variation of the transformer body 10 measured by the temperature resistance temperature sensor, It is possible to accurately determine whether the change is an overheat in a normal operation state or an abnormal deterioration due to a defect.

While the present invention has been particularly shown and described with reference to particular embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims I would like to make it clear.

10: Transformer body
20: Enclosure
111: first thermal image sensor
112: second thermal image sensor
113: Third thermal image sensor
114: Fourth thermal image sensor
121: first partial discharge detection sensor
122: second partial discharge detection sensor
125a: UHF antenna
125b:
127: radio wave shield member

Claims (13)

And a plurality of partial discharge detection sensors installed inside the enclosure accommodating the transformer body to sense a radio wave signal caused by a partial discharge generated in the transformer body,
Wherein the plurality of partial discharge detection sensors are disposed at different positions.
The method according to claim 1,
And a data processing unit for receiving and processing the partial discharge data detected by the partial discharge detection sensor,
Wherein the data processor calculates a position of a partial discharge generated in the transformer body based on partial discharge data sensed by each of the plurality of partial discharge detection sensors.
3. The method of claim 2,
Wherein the plurality of partial discharge detection sensors comprise a first partial discharge detection sensor and a second partial discharge detection sensor,
Wherein the data processor comprises a mold transformer abnormality detection device for calculating a generation position of the partial discharge using the triangulation method based on the maximum signal magnitude position value of the partial discharge sensed by the first partial discharge detection sensor and the second partial discharge detection sensor, .
3. The method of claim 2,
The data processing unit generates partial discharge generation tendency data based on the magnitude of the partial discharge sensed by the plurality of partial discharge detection sensors and the number of discharges and compares the partial discharge occurrence tendency data with predetermined partial discharge pattern data, A mold transformer abnormality detecting device for judging the type of discharge.
The method of claim 3,
Wherein the first partial discharge detection sensor and the second partial discharge detection sensor are disposed at positions capable of sensing the entire three-phase windings of the transformer body independently of each other.
The method according to claim 1,
Wherein the partial discharge detection sensor includes a UHF (Ultra High Frequency) antenna.
The method according to claim 6,
Wherein the partial discharge detection sensor is capable of measuring a frequency range of 0.3 GHz to 1.8 GHz.
The method according to claim 1,
Wherein the partial discharge detection sensor is configured to be capable of tilting operation so that a direction of a receiving unit for receiving a radio wave signal can be changed.
9. The method of claim 8,
Wherein the partial discharge detection sensor has a sidelight such that a sensing amount of a radio wave flowing in a direction other than a direction in which the receiving portion is opposed is minimized.
10. The method of claim 9,
Wherein the partial discharge detection sensor includes a radio wave shielding member surrounding the side and rear of the receiving portion.
11. The method of claim 10,
Wherein the electromagnetic wave shielding member is formed in a polyhedral shape so that irregular reflection is minimized.
3. The method of claim 2,
Wherein the data processing unit displays an abnormal state occurrence alarm in the transformer monitoring system or the terminal when detecting the partial discharge in the plurality of partial discharge detection sensors.
3. The method of claim 2,
Further comprising a current sensor for measuring a magnitude of an operating current supplied to the transformer,
Wherein the data processing unit compares the variation of the partial discharge signal measured by the partial discharge detection sensor with the variation of the noise signal due to the variation of the operation current to determine whether the partial discharge is caused by a defect.

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