KR20190014405A - Oil immersed transformer diagnosis apparatus and method for installing thereof - Google Patents

Abstract

According to an embodiment of the present invention, an inflow transformer diagnosis apparatus comprises: a measurement sensor unit inserted into an inflow transformer so as to measure at least one among the amount of gas, the temperature, and the pressure of the inflow transformer; an installation unit installed in a hole of the inflow transformer; a signal cable electrically connected to the measurement sensor unit so as to be arranged to pass through the hole; a data detection plate arranged in the installation unit and detecting measurement data of the measurement sensor unit through the signal cable; an electronic pressure switch valve installed in the installation unit so as to control the pressure of the inflow transformer according to a driving signal; and a circuit unit receiving the measurement data from the data detection plate and transferring the drive signal to the electronic pressure switch valve.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an oil-immersed transformer diagnosis apparatus and method,

The present invention relates to an apparatus for diagnosing an inflow transformer and a method of installing the same.

The inflow transformer of the inflowing type (self-cooled type) does not have a special diagnosis method. In recent years, according to the TBM (Time Base Maintenance) method, the inflow transformer that has passed 13 years has been replaced in a lump Although we make and use the health index considering the number of years of transformer use, it is still maintained by use time, visual inspection rather than scientific diagnosis method.

In this case, a small amount of air, oxygen, nitrogen, and a harmful gas, which is a combustible gas, are generated due to the occurrence of arc (ARC) due to an internal fault, Overheating is caused to dissolve insulation and insulating oil in the inflow transformer.

In addition, when the input transformer is used for a long time, the electrical insulation is deteriorated and electrical short-circuit (accident) may occur in the inside. Due to the high temperature generated, the insulating oil having about 80% , C2H2, C2H6, C2H4, C3H8, and the like.

When the amount of harmful gas generated is large and the content of the combustible gas component exceeds 1% of the total gas, a power failure occurs immediately, so that a failure diagnosis such as an electrical measurement or an internal check is performed.

Conventional inflow transformers discharge the noxious gas into the atmosphere when a certain internal pressure is exceeded through a mechanical pressure-proof valve when noxious gases such as inert and combustible gases are generated.

However, if there is a sign that an explosion will occur, the amount of gas generated inside the inflow transformer may increase sharply. At this time, the conventional inflow transformer can not discharge the internal pressure quickly, and there is a problem that the risk of occurrence of safety accidents such as large facility accidents, electric fires and explosions becomes very high.

Japanese Patent Application Laid-Open No. 10-2001-0019496

The present invention provides an apparatus for diagnosing an inflow transformer and a method for installing the same, which can reduce the risk of a safety accident of an inflow transformer by quickly discharging gas generated in the inflow transformer.

The apparatus for diagnosing an inflow transformer according to an embodiment of the present invention includes a measurement sensor unit inserted into an inflow transformer and configured to measure at least one of an amount of gas, temperature and pressure of the inflow transformer; A mounting portion configured to be installed in a hole of the inflow transformer; A signal cable electrically connected to the measurement sensor unit and arranged to pass through the hole; A data detection arrangement disposed in the mounting section and configured to detect measurement data of the measurement sensor section via the signal cable; An electronic pressure switch valve installed in the mounting portion and configured to control a pressure of the input transformer in accordance with a driving signal; And a circuit for receiving the measurement data from the data detection and transmitting the drive signal to the electronic pressure switch valve. . ≪ / RTI >

For example, the inflow transformer diagnostic apparatus may further include a mechanical pressure-proof valve installed in the installation section and configured to mechanically control the pressure of the inflow transformer.

For example, the inflow transformer diagnostic apparatus may further include a mechanical pressure-proof valve installed in the second hole of the inflow transformer and configured to mechanically control the pressure of the inflow transformer.

For example, the measurement sensor portion may be inserted into the insulating oil of the inflow transformer, and the signal cable may include a connection connector for blocking the flow of the insulating oil to the data detection plate.

For example, the inflow transformer diagnosis apparatus may further include a data cable electrically connecting the data detection plate and the circuit unit, and the circuit unit may remotely transmit the measurement data and remotely receive the drive signal.

For example, the measurement sensor unit may include a gas sensor for measuring a gas amount inserted into the insulating oil of the inflow transformer to measure the amount of hydrogen gas; And an internal pressure measuring sensor part spaced from the insulating oil of the inlet transformer and disposed closer to the hole than the oil gas measuring sensor part to measure a pressure of the inlet transformer; . ≪ / RTI >

For example, the circuit unit may generate the driving signal to open the electronic pressure switch valve when the amount of hydrogen gas measured by the gas sensor for measuring the gas in the room is out of the reference gas amount range.

For example, the circuit unit may generate the drive signal to open the electronic pressure switch valve when the pressure measured by the measurement sensor unit is out of the reference pressure range.

For example, the circuit portion may generate the drive signal to open the electronic pressure switch valve when the temperature measured by the measurement sensor portion is out of the reference temperature range.

According to an aspect of the present invention, there is provided a method of installing an inflow transformer diagnostic apparatus, comprising: separating the mechanical pressure-proof valve from an inflow transformer provided with a mechanical pressure-proof valve in a hole; A signal cable electrically connected to the measurement sensor unit; a data detection unit configured to detect measurement data of the measurement sensor unit through the signal cable; A data cable electrically connected to the data detection board; a circuit unit electrically connected to the data cable to receive the measurement data from the data detection board and to transmit a drive signal to the data detection board; Inserting the measurement sensor portion into the inflow transformer through the hole in an installation portion provided with an electronic pressure switch valve; Installing the mounting portion in the hole; And installing the mechanical pressure-control valve or the second mechanical pressure-control valve in the mounting portion; . ≪ / RTI >

According to the present invention, it is possible to quickly release the gas generated in the inflow transformer, thereby reducing the risk of occurrence of a safety accident of the inflow transformer.

Also, according to an embodiment of the present invention, an environment for a user's real-time diagnosis of the input transformer is provided, so that the user can utilize the accident prevention diagnosis of the input transformer in advance and prevent it by remote control.

According to an embodiment of the present invention, the risk of a safety accident of the input transformer can be reduced without a large design change of the installed transformer.

1 is a schematic diagram of an inflow transformer diagnostic apparatus according to an embodiment of the present invention.
2 is a distribution chart of a combustible gas generated by local heat generated inside the inflow transformer.
3 is a diagram illustrating an apparatus for diagnosing an influent transformer according to an embodiment of the present invention.
4 is a more detailed view of an inflow transformer diagnostic apparatus according to an embodiment of the present invention.
5 is a diagram further illustrating the arrangement of the mechanical pressure-proof valve of the inflow transformer diagnostic apparatus according to the embodiment of the present invention.
FIG. 6 is a circuit diagram illustrating an apparatus for diagnosing an input transformer according to an embodiment of the present invention. Referring to FIG.

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

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

1 is a schematic diagram of an inflow transformer diagnostic apparatus according to an embodiment of the present invention.

The inflow transformer disclosed herein may include a distribution transformer (e.g., a pillar transformer, a ground transformer) capable of providing power close to a recipient using a general low pressure.

The apparatus for diagnosing an inflow transformer according to an embodiment of the present invention may be installed in an inflowing transformer installed in a place around the country or installed afterwards.

For example, the inflow transformer diagnostic apparatus may be installed in three inflow transformers 100a, 100b, and 100c based on the pole numbers, and the inflow transformer diagnosis apparatus may be installed in each inflow transformer 100a, 100b, 50b and 50c and connecting the output signals detected by the measuring units 50a, 50b and 50c to the circuit unit 60 formed at the upper end of the electric pole 200. [

At this time, a power source required for the operation of the circuit unit 60 can be connected to a necessary power source at a secondary side of the electric pole 200.

The measurement units 50a, 50b, and 50c and the circuit unit 60 configured as described above may be connected in a ratio of 1: 1 or more: 1 in some cases. This is because the installation situation of the inflow transformer at the site and the price aspect of the diagnostic apparatus must be considered.

A wired / wireless communication module is included in the circuit unit 60 to transmit signals detected by the measuring units 50a, 50b, and 50c to and from a transformer, which is transmitted from a circuit unit provided through an external communication network 300 301) and processed to diagnose the condition of the input transformer, display the diagnosis result, and connect to the terminal unit 400 which can perform the remote action (302) on the abnormal input transformer according to the state.

However, according to the design, the circuit unit 60 may control the inflow transformer itself without communicating with the external communication network 300 or the terminal unit 400. Accordingly, the gas generated in the inflow transformer can be quickly released, and the risk of occurrence of safety accidents of the inflow transformer can be reduced.

The communication network 300 may be composed of wired communication such as TCP IP, RS232, IEC61850, or wireless communication such as Wi-Fi, LoRa, SIGFOX, and the like. It is effective to constitute wireless communication for convenience of action in the field situation of the inflow transformer, but it is not limited thereto.

Further, the detection signal obtained from the terminal unit 400 alerts an abnormal signal inside the inflow transformer through an internal analyzing mechanism, and the user can determine that the detected signal can delay the explosion symptom that rushes through the remote action 302 have.

For example, the terminal unit 400 may include a terminal program for processing information on the temperature of the insulating oil, the distribution of the in-oil gas, and the pressure inside the transformer, and a display unit for displaying the processed data.

The terminal unit 400 may be configured as a server to systematically manage information of a plurality of inflow transformers provided in the field.

Also, the terminal unit 400 may configure a multi-level range of the signal of the diagnostic apparatus installed in the field through the remote action 302, and may divide the configured range into alert areas and remotely set the signals. This allows the administrator to specify the information of a specific inflow transformer and provide the convenience to periodically manage it in the actual field.

The measuring units 50a, 50b and 50c can detect the temperature of the insulating oil, the information of the oil gas and the signals of the internal gas pressure in the respective inlet transformers 100a, 100b and 100c.

In order to prevent accidents due to an abnormality of the inflow transformer, the inflow transformer diagnosis apparatus according to an embodiment of the present invention recognizes the occurrence of the internal oil gas due to an abnormality inside the inflow transformer, And it is possible to provide internal gas pressure discharge and on-site environment by recognizing the rise of the gas pressure inside the inflow transformer according to the indication of the inflow transformer explosion.

As described above, in order to prevent an inflow transformer accident, it is first determined whether there is combustible gas in the oil in the inflow transformer. These combustible gases are gases generated by decomposition of insulating oil due to local heat due to an abnormality inside the inflow transformer, and the generated gases are shown in Table 1 below.

In the case of combustible gas, various gases are discharged according to the abnormal phenomenon and the temperature to be heated. If all the combustible gases are detected, the abnormal phenomenon inside the inflow transformer will be grasped and the measures to be taken will be easy. However, in some cases it may be inefficient to have a sensor for detecting all of the above gases.

2 is a distribution chart of a combustible gas generated by local heat generated inside the inflow transformer.

As shown in FIG. 2, it can be seen that the amount of hydrogen gas increases proportionally at temperatures above 150 ° C. for each local column temperature. On the other hand, methane increases at 150 ° C or higher, but the maximum amount is generated at 250 ° C, but the amount of methane is remarkably decreased at higher temperatures. Other examples include ethane, ethylene, and acetylene.

Accordingly, the inflow transformer diagnosis apparatus according to an embodiment of the present invention can measure hydrogen gas preferentially, but is not limited thereto.

The circuit portion of the inflow transformer diagnosis apparatus may generate a drive signal to open the electronic pressure switch valve when the temperature measured by the measurement sensor unit is out of the reference temperature range. The reference temperature range may be set to 150 ° C to 250 ° C with reference to FIG. 2, but is not limited thereto.

The circuit portion of the inflow transformer diagnosis apparatus is driven so as to open the electronic pressure switch valve when the amount of hydrogen gas measured by the measuring sensor portion is out of the reference gas amount range or when the pressure measured by the measuring sensor portion is out of the reference pressure range Signal may be generated. The reference gas amount range and the reference pressure range may be set with reference to FIG.

3 is a diagram illustrating an apparatus for diagnosing an influent transformer according to an embodiment of the present invention.

3, the measuring unit 50 includes a predetermined hole 102 at a specific portion of the inflow transformer 100 for installing the measuring unit 50 provided in the inflow transformer 100, The measurement unit 50 can be inserted through the hole 102. [

The measuring unit 50 is formed by inserting the measuring unit 50 into a hole 102 having a gas sensor 51 and a measuring unit 52, It is possible to connect the measurement sensor portions 51 and 52 to the mounting portion 53 by installing the mounting portion 53 in the hole 102 for fixation.

The gas sensor 51 may include a gas sensor and a temperature sensor. The temperature sensor can measure the temperature of the insulating oil to check the current state of the input transformer 100 or use the measured temperature for temperature correction of the gas sensor.

The internal pressure measuring sensor unit 52 is positioned above the insulating oil surface 101 of the upper portion of the inflow transformer 100 to measure the internal pressure. Particularly, the internal pressure measurement sensor unit 52 is installed adjacent to the hole 102 more than the gas sensor 51 for the gas in the gas, can be horizontally installed in the hole 102, But is not limited to, within 1 to 10 cm from the inner wall of the transformer 100. The mounting portion 53 may be connected to a hole 102 provided with a screw tap. A mechanical pressure-proof valve 54 is fastened to one side of the mounting portion 53 and an electronic pressure switch valve 55 can be fastened to the other end surface.

The insulating oil temperature, oil gas information, and internal pressure information detected by the gas sensor 51 and the internal pressure sensor 52 measured by the measuring unit 50 are supplied to the outside through the data cable 61 Lt; RTI ID = 0.0 > 60 < / RTI > In particular, the data cable 61 may be formed of an outdoor coating cable in consideration of the fact that the installation location of the inflow transformer 100 is outdoors, but is not limited thereto.

4 is a more detailed view of an inflow transformer diagnostic apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the gas sensor 51 for measuring the gas in the measuring unit 50 may include a connecting connector 51b at an intermediate portion thereof. Specifically, the gas sensor 51 for measuring the flow of gas transmits the detected signal to the data detector 56 via the signal cable 51a. When a part of the gas sensor 51 for detecting the gas in the room is connected to the insulating oil surface 101, And may be configured to be probed below. In this case, when the pressure inside the inflow transformer 100 rises, a high pressure is applied to the oil inflow oil surface 101 and an accident occurs in which the insulating oil flows out to the outside through the inside of the cover inside the signal cable 51a . This phenomenon is referred to as a capillary phenomenon. In order to prevent this phenomenon, a connecting connector 51b is provided at an intermediate portion to keep the inner pressure of the signal cable 51a constant. Even if the internal pressure of the inflow transformer 100 is increased, the pressure applied to the insulating oil can be released from the connection connector 51b by providing the connection connector 51b, thereby preventing the outflow of the insulating oil.

The mounting portion 53 is connected to the hole 102 by a screw tap and the mechanical pressure-proof valve 54 is fastened to one side of the mounting portion 53 and the electronic pressure switch valve 55 is fastened to the other end have. Particularly, in the installation part 53, signal cables 51a and 52a for transmitting the signals detected by the gas sensor 51 and the internal pressure measurement sensor part 52 and remote control signals 302 (Not shown) may be provided, which includes a remote signal cable 302a that couples the signals to each other. The remote control 302 signal received from the outside is operated through the remote signal cable 302a to operate the electromagnetic pressure switch valve 55 formed on the other end face of the mounting portion 53 to apply the internal gas of the inflow transformer 100 Can be opened / closed to the outside.

The reason why the electronic pressure switch valve 55 is formed in the mounting portion 53 is that the mechanical pressure-proof valve 54 constituting the conventional inflowing transformer 100 is mechanically installed for a long time in an outdoor environment in the nature of the installation of the inflowing transformer 100 It is often the case that the normal operation is not performed due to the corrosion or breakage caused by being left unattended and the immediate action due to the increase of the internal gas pressure in the situation such as the explosion symptom of the inflow transformer 100 is not performed normally. Also, since the mechanical pressure-proof valve 54 is manually operated in response to a pressure exceeding a predetermined pressure, it is not suitable for immediate action in the field. Therefore, an electronic pressure switch valve 55 is provided for remote operation .

5 is a diagram further illustrating the arrangement of the mechanical pressure-proof valve of the inflow transformer diagnostic apparatus according to the embodiment of the present invention.

Referring to FIG. 5, the inlet transformer may be provided with two holes 102 and 103. One of the two holes 102 and 103 may be provided with a mounting portion and the other may be provided with a mechanical pressure-proof valve 54. This form can be applied to new inflow transformers.

According to the installation method of the inflow transformer diagnostic apparatus according to the embodiment of the present invention, when the inflow transformer has one hole and the mechanical pressure-proof valve 54 is installed in the one hole, the mechanical pressure- The mechanical pressure-regulating valve 54 or the second mechanical pressure-proof valve may be installed in the mounting portion. This is because the installed transformer may not have a separate installation hole.

FIG. 6 is a circuit diagram illustrating an apparatus for diagnosing an inflow transformer according to an embodiment of the present invention. Referring to FIG.

As shown in FIG. 6, the temperature, oil gas information, and internal pressure information of the insulating oil measured inside the inflow transformer 100 are transmitted to the input port 61a in the circuit unit 60, And stored in the storage unit 64, which is integrated in the signal processing unit 63 and is an internal internal memory of the signal processing unit 63. The stored signal data is transmitted / received (301) through an external communication network through the communication unit (65), and this data can be received by the terminal unit (400). In particular, the received data may be displayed as related information to the administrator through data processing and processing in the terminal unit 400. The manager also determines the processed data and transmits the data to the circuit unit 60 again with the remote action signal 302. The data is transmitted to the output port 62 through the signal processing unit 63, To operate the electronic pressure switch valve 55 provided in the measuring units 50a, 50b and 50c installed in the inflow transformer 100 to prevent an accident.

If it is determined that an abnormality has occurred in the inflow transformer 100 due to such a series of data processing, it can be repaired immediately and it is possible to prevent a safety accident due to the interruption and breakage of the inflow transformer suddenly.

According to the design, the circuit unit 60 of the inflow transformer diagnosis apparatus according to an embodiment of the present invention may control the inflow transformer itself without communicating with the terminal unit 400. [ Accordingly, the gas generated in the inflow transformer can be quickly released, and the risk of occurrence of safety accidents of the inflow transformer can be reduced.

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

50:
51: Oil gas measurement sensor unit
51a: Signal cable
51b: Connection connector
52: Internal pressure measuring sensor part
53: Installation section
54: Mechanical pressure-proof valve
55: Electronic pressure switch valve
56: Data detection publication
60:
61: Data cable
100: Inflow transformer
101: Insulating oil surface
102, 103: holes

Claims (10)

A measurement sensor unit inserted into the inlet transformer and configured to measure at least one of an amount of gas, temperature and pressure of the inlet transformer;
A mounting portion configured to be installed in a hole of the inflow transformer;
A signal cable electrically connected to the measurement sensor unit and arranged to pass through the hole;
A data detection arrangement disposed in the mounting section and configured to detect measurement data of the measurement sensor section via the signal cable;
An electronic pressure switch valve installed in the mounting portion and configured to control a pressure of the input transformer in accordance with a driving signal; And
A circuit for receiving the measurement data from the data detection and transmitting the drive signal to the electronic pressure switch valve; And an inverter transformer.
The method according to claim 1,
Further comprising a mechanical pressure-proof valve installed in the mounting portion and configured to mechanically control the pressure of the inlet transformer.
The method according to claim 1,
And a mechanical pressure-proof valve installed in a second hole of the inlet transformer to mechanically control the pressure of the inlet transformer.
The method according to claim 1,
Wherein the measurement sensor unit is inserted into the insulating oil of the inflow transformer,
Wherein the signal cable comprises a connection connector for blocking the flow of the insulating oil to the data detection publication.
The method according to claim 1,
Further comprising a data cable electrically connecting the data detection board and the circuit unit,
Wherein the circuitry remotely transmits the measurement data and remotely receives the drive signal.
The apparatus according to claim 1,
A wet gas measurement sensor part inserted into the insulating oil of the inflow transformer to measure the amount of hydrogen gas; And
An internal pressure measuring sensor part spaced from the insulating oil of the inlet transformer and disposed in the hole closer to the oil gas measuring sensor part to measure the pressure of the inlet transformer; And an inverter transformer.
The method according to claim 6,
Wherein the circuit portion generates the drive signal to open the electronic pressure switch valve when the amount of hydrogen gas measured by the gas sensor for measuring the gas in the room is out of the reference gas amount range.
The method according to claim 1,
Wherein the circuit section generates the drive signal to open the electronic pressure switch valve when the pressure measured by the measurement sensor section is out of the reference pressure range.
The method according to claim 1,
Wherein the circuit section generates the drive signal to open the electronic pressure switch valve when the temperature measured by the measurement sensor section is out of the reference temperature range.
Separating the mechanical pressure-proof valve from an inlet transformer having a mechanical pressure-proof valve installed in a hole;
A signal cable electrically connected to the measurement sensor unit; a data detection unit configured to detect measurement data of the measurement sensor unit through the signal cable; A data cable electrically connected to the data detection board; a circuit unit electrically connected to the data cable to receive the measurement data from the data detection board and to transmit a drive signal to the data detection board; Inserting the measurement sensor portion into the inflow transformer through the hole in an installation portion provided with an electronic pressure switch valve;
Installing the mounting portion in the hole; And
Installing the mechanical pressure regulating valve or the second mechanical pressure regulating valve in the mounting portion; Wherein the method comprises the steps of:

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