JPH09219277A - Lighting arrester monitoring device for thyrister valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely detect a leakage current value for a lightning arrester by photographing a leakage current indicating means for the lightning arrester provided for every thyrister unit via a monitor camera and electrically sending it to a control center for monitoring. SOLUTION: In an AC-DC convertor mounted on an insulation frame 16 with plural thyrister valve units 12 loaded thereon, a thyrister valve lightning arrester monitoring device is used. Each thyrister valve unit 12 is provided with a lightning arrester 14 and a leakage current detecting and indicating display 15 to detect and indicate a leakage current for the lightning arrester 14. A monitor camera 17 is set to be opposed to the leakage current detecting and indicating display 15. The leakage current detecting and indicating display 15 is photographed via the monitor camera 17 and electrically sent to a central control board 19 for monitoring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surge arrester monitoring device for protecting a thyristor valve attached to an AC / DC converter used in DC power transmission or a frequency conversion station.

[0002]

2. Description of the Related Art As an example of a circuit of an AC / DC converter for DC power transmission or a frequency conversion station, for example, Japanese Patent Laid-Open No. 6-1811.
There is one shown in FIG. 7 and FIG. 8 shown in Japanese Patent Publication No. 09. In this configuration, the transformers 2 and 3 for conversion are connected to the AC system bus 1.
Is connected, and a required number of thyristor valves 4 are connected to the secondary side of the transformers 2 and 3 for converter to form a bridge circuit, and a surge protector 7 for valve protection is connected in parallel to both ends of each thyristor valve 4. , A bridge circuit protection arrester 8 is connected in parallel to each bridge circuit.

Since a lightning arrester used in a normal AC circuit is always grounded at one end, the deterioration condition is monitored by detecting a leakage current flowing to the ground. But,
Since the lightning arrester used for the AC-DC converter is connected to each thyristor valve and not grounded, it detects the leakage current flowing according to the shared voltage of each thyristor valve, and determines the deterioration status depending on the state of this change. It will be judged. The thyristor valve is at a high electric potential with respect to the ground, and the position where it is attached is a position where the insulation distance is sufficient to withstand the electric potential, and it is far from the ground. A method of reading with the binoculars 10 and recording and monitoring the change with time of the leakage current has been adopted.

[0004]

However, it is difficult to accurately read the display section of the leakage current flowing through the lightning arrester located at a distant position with the binoculars, and there is a problem of lack of accuracy. Also,
Since the AC / DC converter is usually installed indoors and it is sufficient to ensure an insulation distance from the surrounding walls, there is not much distance, so it is often difficult to see with binoculars, so it is often difficult to see, and all thyristor units have It is difficult to accurately read the leakage current, and in some cases it is unreadable.

The present invention has been made in order to solve the above-mentioned problems, and the display means of the leakage current of the lightning arrester attached to each thyristor unit is photographed by a monitor camera and transmitted to the central control room. To monitor. Also, when displaying images taken with a monitor camera,
The scale mask of the display means is displayed, and the captured image is displayed in combination with the scale mask of the display means.

The present invention has been made to solve the above-mentioned problems, and a monitor camera photographs the display portion of the leakage current detection display means of the lightning arrester attached to each thyristor unit, and this is centrally controlled. It is transmitted to the room and monitored. Further, when displaying an image captured by a monitor camera, a scale mask corresponding to the display unit is displayed to combine the captured images for display.

[0007]

A lightning arrester monitoring device for a thyristor valve according to claim 1 of the present invention is equipped with a lightning arrester and a lightning arrester leakage current detection display means for each thyristor valve unit, and separates the leakage current display portion. The image is taken from a position with a monitor camera and transmitted to the centralized monitoring room for monitoring.

The lightning arrester monitoring device for a thyristor valve according to claim 2 of the present invention is mounted so that the display portion of the leakage current detection display means mounted on each thyristor valve faces a monitor camera installed on the wall surface facing it. , The monitor cameras are sequentially photographed toward the display section of each thyristor valve unit, and are transmitted to the centralized control panel.

In the arrester monitoring device for a thyristor valve according to claim 3 of the present invention, the display portions of the leakage current detection display means attached to each thyristor valve are arranged so as to face the wall surfaces facing each other, and a monitor is provided on the wall surface. A rail is provided so that the camera can move to a position facing the display of each thyristor valve unit, a monitor camera is mounted on this rail, and the display of the leakage current detection display means of each thyristor valve unit is sequentially photographed. It is designed to be transmitted to the central control panel.

According to a fourth aspect of the present invention, in a lightning arrester monitoring device for a thyristor valve, an image mask showing the same current scale as the display portion of the leakage current detection display means is displayed on the image display means of the monitor, and the monitor camera takes an image. The displayed image is displayed according to the image mask.

According to a fifth aspect of the present invention, there is provided a lightning arrester monitoring device for a thyristor valve, wherein a scale of an image mask displayed on an image display means of a monitor displays a caution range and a caution range requiring attention.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 shows an example of the installation state of the thyristor valve device, 11 is a thyristor valve unit assembly, 12 thyristor valve units,
It is composed of 13 connection leads, 14 lightning arresters, and 15 leakage current detection display means display section. Reference numeral 16 is a pedestal on which a plurality of thyristor valve assemblies 11 are combined and placed. This structure is installed in the building. Reference numeral 17 is a monitor camera for photographing the leakage current detection display means display unit 15, which is arranged on the wall of the building so that the photographing direction can be freely adjusted toward an arbitrary thyristor valve. Reference numeral 18 is a transmission cable for transmitting a captured image of the monitor camera 17. Reference numeral 19 is a monitor image display means for displaying an image taken by the monitor camera.

The thyristor valve device of FIG. 1 comprises the circuit shown in FIG. The lightning arrester 14 that protects the thyristor valve unit 12 is connected to both ends of the thyristor valve unit 12 that is connected to the secondary sides of the conversion transformers 2 and 3. The lightning arrester 14 is provided with a leakage current detection display means display unit 15 for detecting and displaying the leakage current and is attached toward the monitor camera 17. The leakage current detection display means display unit 15 uses an ammeter that displays a minute current with a pointer as shown in FIG. Display has scale 1
5a is attached, and the identification plate 16 is provided below the scale 15a.
For example, the normal zone 16a is colored in white, the caution zone 16b is colored in yellow, and the warning zone 16c is colored in red.

The lightning arrester 14 has a non-linear resistor made of a sintered body of zinc oxide incorporated in the inner diameter portion of the porcelain porcelain tube, and operates when an abnormal voltage is applied between the poles of the thyristor valve to protect the thyristor valve. However, during normal operation, a minute leakage current corresponding to the voltage between the electrodes of the thyristor valve flows. The leakage current of the non-linear resistor is small in the normal state, but the leakage current gradually increases as the deterioration progresses, and the deterioration state of the arrester can be monitored by monitoring the change of the leakage current.

In the configuration of FIG. 1, the leakage current of the lightning arrester 14 connected to the thyristor valve unit 12 is displayed on the display portion of the leakage current detection display means, and the leakage current display portion of each lightning arrester 14 is provided at a remote position. Are installed toward the monitor camera 17, and the respective display portions are sequentially photographed while changing the direction of the monitor camera 17, and the transmission cable 18
It is displayed on the monitor image display means via the, and the deterioration status of each lightning arrester 14 is monitored.

When the monitor camera 17 photographs the display portion, the current value can be accurately read by one monitor camera by adjusting the size of the image according to the position of each display portion and photographing.

Embodiment 2 FIG. FIG. 4 shows the second embodiment. Is shown. In this configuration, the display portion 25 of the leakage current detection display means of the lightning arrester 14 attached to the thyristor unit 12 is fixed toward the wall surface of the building, and the leakage current detection display means fixed to the wall surface is opposed to the wall surface. Display section 25
The vertical rails 21 to the left and right of the positions facing the
As shown in FIG. 5, monitor cameras 27 are attached to the horizontal rails 22 whose both ends are movably supported by the left and right vertical rails 21, and the monitor cameras 27 are mounted in front of the display portions 25 of the respective leak current detection display means. It is configured to be moved and photographed. A vertical movement means (not shown) is provided at an end of the horizontal rail 22, and a horizontal movement drive mechanism 24 is provided at a portion of the monitor camera 27 so that a photographing position can be set by remote control.

According to this structure, since the respective leakage current detection / display means display sections photograph at a constant distance, there is almost no reading error of the pointer, and the surge arrester leakage current can be detected accurately.

Embodiment 3 Embodiment 1. Or Embodiment 2. The display unit 15 of the leakage current detection and display means used in the above has a configuration in which the scale and the pointer are photographed and displayed on the monitor image and read, but the scale of the display unit 15 of the leakage current detection and display unit is displayed on the monitor image. When it is displayed, it is difficult to read even the fine scale, and this embodiment 3.
In this case, only the reference point of the leak current detection display means and the pointer are displayed, the scale mask 30 shown in FIG. 6 is displayed on the monitor image, and the scale image is superimposed on the photographed pointer image. The scale mask 30 is provided with an identification plate 31 below the scale 30a. For example, the normal zone 31a is white.
The caution zone 31b is colored yellow and the caution zone 31c is colored red, so that it can be determined at a glance.

According to this structure, the indication of the current on the leakage current display section is read by the scale displayed on the monitor image, so that the current value can be accurately measured. In addition, the deterioration condition can be easily determined by providing an identification plate below the scale and color-coding each of the zones of caution and caution.

[0021]

According to the thyristor valve lightning arrestor monitoring device of the first aspect of the present invention, the display portion of the lightning arrester leakage current detection display means attached to each thyristor valve unit is photographed by the monitor camera. Since the data is transmitted to the centralized monitoring room for monitoring, the leakage current value of the lightning arrester can be accurately detected with one monitor camera, and accurate monitoring can be performed.

In the arrester monitoring device for a thyristor valve according to a second aspect of the present invention, the leakage current detection display means attached to each thyristor valve is set so that its display portion faces toward the facing wall surface and faces the display portion. The monitor camera is moved to the position where it is set, and the display section of each leakage current detection display means is sequentially photographed and transmitted to the central control panel for monitoring, so there is less error in reading the pointer and leakage of the arrester is accurate. Current can be detected and accurate monitoring can be performed.

According to a third aspect of the present invention, there is provided a surge arrester monitoring device for a thyristor valve, wherein the display portions of the leakage current display means attached to the respective thyristor valves are arranged so as to face opposite wall surfaces, and a monitor camera is mounted on the wall surface. Has a rail so that it can move to the position facing the display of each thyristor valve unit, a monitor camera is mounted on this rail, and the display surface of the leakage current detection part of each thyristor valve unit is sequentially photographed and concentrated. Since the electric power is transmitted to the control panel, the size of the image taken by the monitor camera is constant, the reading error of the pointer is further reduced, and the leakage current of the lightning arrester can be detected accurately and proper monitoring can be performed.

In the arrester monitoring device for a thyristor valve according to a fourth aspect of the present invention, an image mask showing the same current scale as the display surface of the leakage current display means is displayed on the image display means of the monitor, and the monitor camera photographs the image. Since the image is displayed according to the image mask, the current value can be accurately read, and the leakage current of the lightning arrester can be detected with high accuracy and appropriate monitoring can be performed.

In the arrester monitoring device for a thyristor valve according to claim 5 of the present invention, an identification plate is provided below the scale of the image mask displayed on the image display means of the monitor to display each of the caution and caution zones in different colors. Therefore, the deterioration status can be easily determined.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a circuit diagram of FIG.

3 is an external view of a leakage current indicator used in the configuration of FIG.

FIG. 4 is a configuration diagram of another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a rail mounting portion of the monitor camera.

FIG. 6 is a configuration diagram of a scale mask displayed on a monitor image.

FIG. 7 is a circuit diagram of a conventional thyristor valve.

FIG. 8 is an explanatory diagram of a leakage current monitoring state of a conventional thyristor valve.

[Explanation of symbols]

11 thyristor valve unit assembly, 12 thyristor valve unit, 13 connection lead, 14 lightning arrester, 15 leakage current detection display means display section, 16 frame,
17 monitor cameras, 18 transmission cables, 19 monitor image display means, 21 vertical rails, 22 horizontal rails, 24 horizontal drive mechanisms, 25 leakage current detection display means display section, 27 monitor cameras.

Claims (5)

[Claims] 1. An AC / DC converter mounted with a plurality of thyristor valve units and mounted on an insulating frame, wherein each thyristor valve unit detects and displays the leakage current of the lightning arrester and the lightning arrester. Is provided, a monitor camera is installed at a position facing the leakage current detection display means, the display part of the leakage current detection display means is photographed and transmitted to the central control panel, and is monitored on the central control panel. Lightning arrester monitoring device for thyristor valve. 2. The monitor camera is installed with a predetermined distance from the thyristor valve unit, and the display section of the leakage current detection display means provided in each thyristor valve unit is installed toward the monitor camera. 2. The lightning arrester monitoring device for a thyristor valve according to claim 1, wherein the camera adjusts the angle of each thyristor valve unit, sequentially captures images, and transmits the images to a centralized control panel. 3. The display section of the leakage current detection display means of the thyristor valve unit is arranged facing the wall surface facing each other, and the monitor camera faces the display section of the leakage current detection display means of each thyristor valve unit on the wall surface. A rail that can be moved to a position where the monitor camera installed on this rail is moved to a position where the display portion of the leakage current detection display means of the thyristor valve unit faces, an image is taken, and the image is transmitted to the central control panel. The arrester monitoring device for a thyristor valve according to claim 1. 4. The image display means of the monitor displays an image mask showing the same current scale as the display portion of the leakage current detection display means, and the image taken by the monitor camera is displayed in accordance with the image mask. The arrester monitoring device for a thyristor valve according to claim 1. 5. The surge arrester monitoring device for a thyristor valve according to claim 4, wherein the scale of the image mask displayed on the image display means of the monitor indicates a caution range and a caution range requiring caution.