KR20130011176A - Uhf patial discharge sensor for oil transformer - Google Patents

Abstract

The present invention is to provide an ultra-high frequency (Ultra high frequency, hereinafter abbreviated as UHF) partial discharge sensor that can be easily installed in the operation of the high voltage inlet transformer in use, that is, in use, and excellent in the detection sensitivity of partial discharge. A first support tube coupled to and fixed to the drain valve of the ultra-high pressure inlet transformer according to the present invention; A second support tube supported by the first support tube and having an end portion positioned outside the inlet transformer and an extension part extending from the one end through the first support tube into the inlet transformer; An ultrahigh frequency antenna fixed to an end of an extension of the second support tube; And a signal line connected to an ultra-high frequency antenna and extending through the interior of the second support tube to the outside of the inflow transformer and transmitting a partial discharge signal, the ultra-high frequency partial discharge sensor for the inflow transformer.

Description

UHF PATIAL DISCHARGE SENSOR FOR OIL TRANSFORMER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra high voltage inlet transformer, and more particularly to an ultra high frequency partial discharge sensor for an ultra high voltage inlet transformer.

An ultra high voltage transformer is a high voltage power system, that is, a power device installed in a power system in power generation, transmission, and substation sections such as a power plant or a substation to step down a voltage.

The ultra high voltage inlet transformer is an ultra high voltage transformer using an insulating oil as an insulating medium for electrical insulation of the ultra high voltage transformer.

These ultra high voltage transformers are electrically connected to the power system, and when operated for a long time, various types of failures may occur due to various causes, and the damage scale due to such failures is also increasing. Therefore, various diagnostic and monitoring techniques and advanced equipment are applied to detect signals generated by insulation abnormalities inside the high voltage transformer before failure occurs. Among them, Partial Discharging measurement is an error of the high voltage transformer. It is currently evaluated as the best way to diagnose it.

Until now, various detection sensors have been developed and applied as partial discharge sensors, and among them, Korean Patent Registration No. 10-0595462 filed and registered by the applicant of the present invention (name of the invention: built-in spiral type sensor for partial discharge detection) Can be introduced as an example of the prior art.

However, the partial discharge sensor according to the prior art has a dedicated installation configuration as a sensor applied to the ultra-high pressure gas insulated switchgear, but may be applicable to a newly designed and manufactured inlet transformer, but cannot be installed to a pre-installed inlet transformer in operation. There was a problem.

Therefore, the present invention is to solve the problems of the prior art, the object of the present invention is installed in operation, that is, can be easily installed in the inlet transformer in use, the ultra-high frequency (Ultra High Frequency, excellent detection sensitivity of partial discharge) It is to provide a partial discharge sensor (hereinafter abbreviated as UHF).

An object of the present invention is for an inflow transformer having a drain valve for insulating oil discharge, and in the ultrahigh frequency partial discharge sensor for an inflow transformer,

For the inflow transformer having a drain valve (DRAIN VALVE) for insulating oil, in the ultra-high frequency partial discharge sensor for the inflow transformer,

A first support tube fixedly coupled to the drain valve;

A second support tube supported by the first support tube and having an end portion positioned outside the inlet transformer and an extension part extending from the one end through the first support tube into the inlet transformer; And

It may be achieved by providing an ultrahigh frequency partial discharge sensor for an inlet transformer according to the present invention, including an ultra high frequency antenna (UHF ANTENNA) fixed to an end of an extension of the second support tube to detect a partial discharge signal in the inlet transformer.

Since the ultra-high frequency partial discharge sensor for the inflow transformer according to the present invention has a configuration in which the inlet transformer extends into the inflow transformer through a drain valve for insulating oil discharge installed in each inflow transformer, the inflow transformer is installed and operated. It has an advantage that it can be easily installed and used, and since the structure is detected to detect partial discharge by injecting the UHF ANTENNA into the inflow transformer, the partial discharge detection sensitivity can also have excellent effect.

The ultra-high frequency partial discharge sensor for an inflow transformer according to the present invention can transmit the partial discharge signal detected by the UHF antenna to the outside through a signal line disposed inside the support tube, thereby providing an external dedicated analyzer, data acquisition device, and spectrum. By analyzing the partial discharge signal using an analyzer or the like, an effect of easily analyzing the deterioration state of the inlet transformer can be obtained.

The ultra-high frequency partial discharge sensor for an inflow transformer according to the present invention comprises a UHF antenna as a spherical antenna, and thus it is possible to obtain an effect of constituting an antenna and a high frequency partial discharge sensor with wideband ultra high frequency detection characteristics and light weight and small size. .

In the ultra-high frequency partial discharge sensor for an inlet transformer according to the present invention, the first support tube includes a flange portion for coupling with a drain valve, and a hollow cylindrical extension portion extending from the flange portion, The first support pipe can be easily connected between the flange part and the drain valve installed in the inlet transformer by using a nut, and the UHF antenna is attached into the inlet transformer through the inner hollow part of the hollow cylindrical extension part and the inner valve seal of the drain valve. It is possible to obtain the effect that can be easily injected.

The ultra-high frequency partial discharge sensor for an inflow transformer according to the present invention is installed in the first support pipe in communication with the drain valve, and further includes an exhaust valve which can be opened for air exhaust, thereby providing the ultra-high frequency partial discharge sensor according to the present invention. When installed in combination with the drain valve of the inlet transformer to inject the antenna into the inlet transformer, air enters the insulating oil in the inlet transformer and bubbles may occur, causing the bubbles to insulate. The air is discharged through the exhaust valve. The effect of preventing occurrence and breakdown of the insulation can be obtained.

1 is a schematic view showing the configuration of an inlet transformer that can be installed ultra-high frequency partial discharge sensor according to the present invention,
Figure 2 is a cross-sectional view showing the configuration of the ultra-high frequency partial discharge sensor for the inlet transformer according to the present invention installed in combination with the drain valve of the inlet transformer to be injected into the tank of the inlet transformer,
Figure 3 is a perspective view showing only the external appearance of the ultra-high frequency partial discharge sensor for the inlet transformer according to the present invention,
Figure 4 is a cross-sectional view of the UHF antenna and the second support tube showing the configuration of the UHF antenna of the ultra-high frequency partial discharge sensor for the inlet transformer according to the present invention.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

First, a schematic configuration of an inflow transformer will be described with reference to FIG. 1, which is a schematic diagram showing a configuration of an inflow transformer in which an ultrahigh frequency partial discharge sensor according to the present invention can be installed.

As shown, the inlet transformer 100 includes a tank 10, a transformer coil part 20, an insulating oil 40, and a drain valve 30.

Here, the tank 10 is a portion of the housing of the inlet transformer 100, that is, the enclosure.

The transformer coil 20 is mounted in the tank 10, and the insulating oil 40 is filled around the transformer coil 20 in the tank 10.

The transformer coil unit 20 includes a primary coil and a secondary coil having a winding ratio determined according to a desired voltage step-down ratio to each other, and induces the voltage of the power received in the primary coil by stepping down the secondary coil. As a well-known transformer unit outputting a three-phase alternating current can be configured as a set of three.

The insulating oil 40 is provided for electrical insulation between the transformer coil parts 20 of each phase.

The drain valve 30 is provided for discharging the insulating oil 40 during maintenance, such as checking, replenishing, and replacing the state of the insulating oil 40, as the insulating performance is usually lowered when the insulating oil 40 is used for a long time. It is provided in communication with the inside of the tank 10 in the lower portion. As can be seen in the cross-sectional view of FIG. 2, the drain valve 30 includes an open / close handle 30a, a valve body 30b, a valve housing 30c and a valve chamber 30d. Include.

The opening / closing handle 30a provides a manual operation means for valve opening and closing operation of the drain valve 30.

The valve body 30b is a means which is connected to the open / close handle 30a and is movable to have a valve closed position descending into a valve chamber 30d or a valve open position as shown in FIG.

The valve housing 30c is a valve enclosure 30 supporting the open / close handle 30a and the valve body 30b and provided with a valve chamber 30d in which an inlet and outlet communicate with each other.

The valve chamber 30d is formed in communication between the inlet and the outlet of the valve housing 30c of the drain valve 30 to provide a discharge passage of the insulating oil 40 and at the same time, the opening and closing space of the valve body 30b. It is part that provides.

On the other hand, the configuration and action of the ultra-high frequency partial discharge sensor for the inlet transformer according to a preferred embodiment of the present invention that can be installed in combination with the drain valve 30 of the inlet transformer 100 is configured as described above 2 to FIG. It demonstrates with reference to 4.

2 and 3, the ultra-high frequency partial discharge sensor 50 for an inlet transformer according to an exemplary embodiment of the present invention may include a first support tube 53, a second support tube 52, and an ultra-high frequency antenna. (UHF ANTENNA) 51 is configured.

As can be seen in Figure 2, the first support pipe 53 is fixedly installed in combination with the drain valve (30). In addition, the first support tube 53 is configured to include a flange portion 53a and a cylindrical extension portion 53b.

The flange portion 53a is a coupling portion having a diameter larger than the cylindrical extension portion 53b of the first support tube 53 for engagement with the drain valve 30 and includes a plurality of bolt through holes. Accordingly, after the bolt is inserted into the corresponding bolt hole of the drain valve 30 through the bolt through hole of the flange portion 53a, the first support pipe 53 drains by tightening the bolt with a nut and a washer. It may be combined with the valve 30.

The cylindrical extension portion 53b extends from the flange portion 53a and has a hollow structure with a hollow inside of the cylinder. This hollow structure is for installing the second support tube 52 to extend through the interior of the cylindrical extension portion 53b. The second support tube 52 may be composed of a single cylinder as shown in FIG. 2, and as shown in FIG. 3, a main tubular portion having a threaded portion at both ends and a corresponding main tube. It may be configured as a connection structure having a connecting portion screwed to the threaded portion of both ends of the pipe portion.

In Fig. 2, reference numeral 53c denotes an exhaust that connects the internal hollow portion of the first support pipe 53 and the valve chamber 30d of the drain valve 30 to communicate with the outside air through an exhaust valve 54 described later. Instruct the furnace.

The ultrahigh frequency partial discharge sensor 50 for an inlet transformer according to an exemplary embodiment of the present invention may further include an exhaust valve 54. The exhaust valve 54 is provided in the first support pipe 53 in communication with the valve chamber 30d of the drain valve 30 through the exhaust passage 53c. The exhaust valve 54 is provided to be open to exhaust the air that can be introduced when the ultra-high frequency partial discharge sensor 50 according to the present invention is installed.

The second support tube 52 may be composed of an elongated tube that is hollow inside and is supported by the first support tube 53. The second support tube 52 is a first support from an external exposed end 52b and an external exposed end 52b, which is an end positioned outside the inlet transformer 100, more specifically, outside the tank 10. It has an extension portion 52a extending through the pipe 53 and into the inflow transformer, that is, into the tank 10.

The microwave antenna 51 is fixed to the end of the extension portion 52a of the second support tube 52. Fixing may be implemented in various ways, such as screwing, bonding. According to a preferred embodiment of the present invention, the ultra-high frequency antenna 51 may be configured as a spiral antenna as shown in FIG. 4. By constructing the ultra-high frequency antenna 51 with the spiral antenna, the present invention can obtain the effect of constructing the broadband ultra-high frequency detection characteristics and the light and small size of the partial discharge signal detection antenna and the ultra-high frequency partial discharge sensor including the antenna. have.

 The ultrahigh frequency partial discharge sensor 50 for an inlet transformer according to an exemplary embodiment of the present invention may further include a signal line 55. The signal line 55 is connected to the microwave antenna 51 to extend through the interior of the second support tube 52 to the outside of the inlet transformer 100 and provides a means for transmitting a partial discharge signal. Here, the embodiment in which the signal line 55 is connected to the signal output line of the microwave antenna 51 through a connector (not shown) that may be provided in the extension portion 52a of the second support tube 52 is possible. Do. When the microwave antenna 51 is configured in connection with a wireless transmitter (not shown), the signal line 55 may be unnecessary.

On the other hand, a brief description of the installation method and operation of the ultra-high frequency partial discharge sensor for the inlet transformer according to a preferred embodiment of the present invention configured as described above are as follows.

The installation method and operation of the ultra-high frequency partial discharge sensor for the inlet transformer according to the preferred embodiment of the present invention will be described with reference to FIG. 2.

After preparing the assembly of the first support pipe 53 and the exhaust valve 54 as shown in FIG. 2 in the first step, the bolt is passed through the bolt through hole of the flange portion 53a to the corresponding bolt hole of the drain valve 30. After the bolt is inserted into the first support tube 53 and the drain valve 30 by fastening with a nut and a washer (washer).

Next, in a second step, the drain valve 30 is opened by operating the opening / closing handle 30a.

Next, in the third step, the end of the assembly of the second support tube 52, the microwave antenna 51 and the signal line 55 is fixed into the tank 10 of the inlet transformer 100. It is pushed through the inner hollow part of the 1st support pipe 53 and the valve chamber 30d of the drain valve 30 so that it may be injected.

Next, in the fourth step, the formation of bubbles in the insulating oil 40 is prevented by opening the exhaust valve 54 to exhaust air that may have flowed in during installation of the ultra-high frequency partial discharge sensor for the inlet transformer according to the preferred embodiment of the present invention. To help. Thus, the installation of the ultra-high frequency partial discharge sensor for the inlet transformer according to the preferred embodiment of the present invention can be completed.

As such, when the installation of the ultra-high frequency partial discharge sensor for the inlet transformer according to the preferred embodiment of the present invention is completed, an analysis device such as a dedicated analyzer, a data acquisition unit, or a spectrum analyzer is installed on the signal line 55. By analyzing the partial discharge signal provided by the ultra-high frequency partial discharge sensor 50 for the inlet transformer according to the preferred embodiment of the present invention through a corresponding analyzer, it is possible to easily analyze the deterioration state of the inlet transformer 100. have.

That is, when the microwave antenna 51 detects the ultra-high frequency partial discharge signal generated by the deterioration of the inflow transformer 100 and provides the signal through the signal line 55, the dedicated analyzer and data acquisition unit (Data Equisition Unit). By analyzing through an analysis device such as a spectrum analyzer or the like, it is possible to check whether the inflow transformer 100 is deteriorated.

10: tank 20: transformer coil part
30: drain valve 30a: opening and closing handle
30b: valve body 30c: valve housing
30d: valve chamber 40: insulating oil
50: ultra-high frequency partial discharge sensor 51: ultra-high frequency antenna
52: second support tube 52a: extension portion
52b: external exposed end 53: first support tube
53a: flange portion 53b: cylindrical extension portion
53c: exhaust passage 54: exhaust valve
55: signal line

Claims (5)

For the inflow transformer having a drain valve (DRAIN VALVE) for insulating oil, in the ultra-high frequency partial discharge sensor for the inflow transformer,
A first support tube coupled to and fixed to the drain valve;
A second support tube supported by the first support tube and having an end portion positioned outside the inlet transformer and an extension part extending from the one end through the first support tube into the inlet transformer; And
An ultrahigh frequency partial discharge sensor for an inlet transformer, comprising: a high frequency antenna (UHF ANTENNA) fixed to an end of an extension of the second support tube to detect a partial discharge signal in the inlet transformer. The method of claim 1,
And a signal line connected to the microwave antenna and extending outwardly of the inflow transformer through the inside of the second support tube and transmitting a partial discharge signal. The method of claim 1,
The ultrahigh frequency antenna is a high frequency partial discharge sensor for an inlet transformer, characterized in that consisting of a spiral antenna (SPIRAL ANTENNA). The method of claim 1,
The first support tube,
Flange portion (FLANGE PORTION) for coupling with the drain valve,
Ultra-high frequency partial discharge sensor for an inlet transformer, characterized in that it extends from the flange portion and comprises a hollow cylindrical extension. The method of claim 1,
It is installed in the first support tube in communication with the drain valve, the ultra-high frequency partial discharge sensor for the inlet transformer, characterized in that it further comprises an exhaust valve which can be opened for the inlet air exhaust.

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