JPH088730B2 - Electricity cable maintenance monitoring method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a maintenance and monitoring method for a power cable laid in a cave or a manhole.

[Prior Art] Power cables, especially cross-linked polyethylene insulated vinyl sheath cables with a capacity of 154 kilovolts (kV) or more (hereinafter referred to as CV cables) are laid inside a cave in a city, and prevent disasters in this cave. It is important to keep city life safe. As described above, it is becoming important to constantly maintain and monitor the main trunk line of electric power transportation from the stable operation of the electric power system in the city. Such power cable maintenance monitoring covers temperature distribution during operation, thermal behavior of the cable or its connection, and environmental conditions in the cave and manhole.

Conventionally, such monitoring has been such that dedicated sensors for temperature, humidity, pressure and smoke are installed at predetermined intervals, and information from these sensors is processed by a computer for centralized monitoring. .

[Problems to be Solved by the Invention] However, in such a monitoring system, there is a problem that sufficient monitoring cannot be performed until now because the movement change due to the thermal behavior of the CV cable is complicated. This is because the thermal behavior of the CV cable is gradual, and even if a sensor is installed, it is only a change at that point, and it is difficult to grasp the movement of the entire CV cable.

The present invention has been made in view of such points,
It is an object of the present invention to provide a maintenance monitoring method capable of three-dimensionally displaying and monitoring the thermal behavior of a CV cable laid in a cave or a manhole.

[Means for Solving Problems] The present invention provides a plurality of CV cables laid in a cave and a human hole or a connecting portion thereof with a near-infrared absorbing paint or a reversible temperature indicating paint in a longitudinal direction of the cable. Marking is done, multiple infrared cameras are arranged in a three-dimensional position in the above-mentioned cave or at a predetermined place in the human hole, and the position change based on the marking of the CV cable or its connection is input to the image data processing device. The feature matching method and the pattern recognition method are used to perform maintenance monitoring of this change as a three-dimensional image.

Therefore, the movement amount of the position change associated with the thermal behavior in the operating state of the CV cable can be displayed on the image output device and can be compared and recorded with the cable change amount of the allowable value that is input in advance.

[Embodiment] An embodiment of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a perspective view for explaining a schematic configuration of a maintenance monitoring system for a CV cable and a connecting portion arranged in a sinus and a human foramen to which the present invention is applied, and FIG. 2 is an infrared camera and marking. It is a perspective view for explaining an example of arrangement with.

As shown in FIG. 1, the maintenance monitoring system of this embodiment is laid in the cavern 13 and the manhole 11. That is,
The CV cable 8 is placed on the trough 12 made of FRP in the cave 13 and the CV cable 8 and its connecting portion 9 are laid in the manhole 11 supported by the vertical metal fittings 10 and the horizontal metal fittings 14. There is. this
As shown in FIG. 2, the CV cable 8 and its connecting portion 9 have near-infrared rays containing, for example, a nickel dithiolate system and phthalocyanines at the center of the CV cable 8 and its connecting portion 9 in the longitudinal direction. Absorption paint or, for example, Ag ₂ HgI
Make multiple markings 15 with temperature-indicating paint, temperature-inhibiting tape, etc. containing _4- Cu ₂ HgI ₄ solid solution. Further, the infrared cameras 1a and 1b are arranged in the cave 13 or in the manhole 11 so as to have a predetermined base line length l which corresponds to two base points of triangulation. In order to recognize the entire cable with the infrared camera, it is necessary to recognize the CV cable 8 and the connection parts 9 behind the CV cable 8 so as to erase the metal objects and accessories such as supports. Therefore, the CV cable 8 and its connecting portion 9
As shown in FIG. 2, an infrared absorbing paint or temperature indicating paint is applied to the CV cable 8 and its connecting portion 9
Infrared camera 1a, 1 is a paint whose infrared wavelength does not change much even if the temperature of 0 ℃ to 60 ℃ changes.
By recognizing in b, it is recognized as the target cable or the like.

Since the temperature of the cable 8 and the like also rises and emits infrared rays, it is necessary to mark the infrared absorbing paint or the temperature indicating tape 15 so as not to be confused with this.

With such a configuration, the movement of the portion of the cable 8 etc. to which the infrared paint is applied is recognized regardless of the back,
It is possible to erase the back object.

. The infrared cameras 1a and 1b are arranged at two base points having a base line length l for stereoscopic recognition.
Regarding the infrared camera 1a of the stand, only a specific mark among the marks of infrared absorbing paint or the like applied to the cable 8 or the like is recognized, and the other infrared camera 1b is recognized.
Is arranged so as to recognize other marks than the above among the plurality of marks.

These cameras 1a and 1b are input through an optical cable 7 to an image data processing device 2 such as a computer and converted into image data. This image data is input to the next main computer 3.

The main computer 3 first recognizes the marking position of the CV cable 8 etc. in the initial state, and when the position is moved by energizing the CV cable 8 etc., the change of the marking 15 is calculated with the passage of time. . At this time, since the position changes are also recorded by the plurality of infrared cameras 1a and 1b, these can be stereoscopically combined and recognized as a three-dimensional movement of the CV cable 8 or the like. From this movement, the twist, bend and axial force of the CV cable 8 etc. can be calculated.

By calculating the temperature and the position change by the marking 15 of the CV cable 8 and its connecting portion 9, a signal is sent to the image output device 4 such as a CRT display with a memory or a printer with a memory for screen display or recording. Monitoring and trough 1 in cave 13 and foramen 11
The environmental temperature including the components such as 2, the vertical metal fittings 10 and the horizontal metal fittings 14 can also be monitored together.

At this time, the infrared cameras 1a and 1b are arranged with a base line length l between them, and are adapted to photograph the CV cable 8 and its connecting portion 9. Therefore, the feature matching method or the pattern recognition method is used. By applying image information processing, the position change can be easily measured. Further, particularly by using infrared cameras 11a and 1b as the cameras, it is possible to measure as a three-dimensional temperature distribution by a thermograph of the CV cable 8 and its connecting portion 9 and surrounding objects, the surrounding environment, etc. 73
Specific infrared rays such as near infrared rays from 0 to 850 nm, visible light, or
Only the wavelength change in the reversible range of the marking 15 provided in the longitudinal direction of the CV cable 8 and its connecting portion 9 is detected, and the CV is detected.
It is possible to precisely monitor the thermal behavior of the cable 8 and its connection 9.

In this embodiment, a plurality of infrared cameras are used, but if the monitoring place is a bright place, a visible light camera can be used together.

[Effects of the Invention] As described above, according to the present invention, the following effects can be achieved.

(1) Using an infrared camera and an image processing device, the CV cable and its connection part are pre-installed on the CV cable based on the marking with near-infrared absorption paint or reversible temperature-sensitive paint.
The thermal behavior of the cable and its connections can be accurately monitored.

(2) It was laid in a special place such as a cave where people cannot enter
The thermal behavior of CV cables can be easily monitored.

(3) The temperature distribution of the power cable system can be monitored without contact.

(4) The marking applied to the CV cable and its connecting portion is a near-infrared absorbing paint or pigment, temperature indicating paint or temperature indicating tape, etc., and can be easily attached to the CV cable and its connecting portion.

(5) Since it is a method of detecting infrared rays, it is a target object regardless of day or night without the need for any other certification device.
The CV cable and its connection can be monitored, and the amount of information is large.

[Brief description of drawings]

FIG. 1 and FIG. 2 are perspective views for explaining a maintenance monitoring method of a CV cable laid in a cavern or a human hole to which the present invention is applied and a connection portion thereof. 1a, 1b …… Infrared camera 3 …… Main computer 4 …… Image output device

Claims (1)

[Claims] 1. In a power cable system such as a CV cable laid in a cave or a manhole, a plurality of markings are provided on the cable or its connecting portion in the length direction of the cable with a color recognizable material by an infrared camera. Place a plurality of infrared cameras in a three-dimensional position at a predetermined location in the cave or human hole where the cable or its connection is laid, and change the position based on the marking of the cable or its connection. Input to the image data processing device and read by a feature matching method or a pattern recognition method, and this change is read as a three-dimensional image to monitor the movement amount of the cable or its connecting portion. Maintenance monitoring method.