JPH09218150A - Salt damage monitor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a salt damage monitor system capable of accurately measuring a deposited salt amount at a plurality of positions on a real time basis, and even predicting the amount. SOLUTION: Regarding a system for monitoring a salt damage due to salt deposited on the insulator of an electrical facility such as a transmission line, meteorological measurement instruments 3a to 3c for measuring the meteorological data of a wind direction, a wind velocity and a precipitation are installed at a plurality of monitor positions 1a to 1c, and an amount of salt deposited on insulators 2a to 2c at each of the monitor positions 1a to 1c is calculated on the basis of the meteorological data so measured. Also, an optical waveguide is fitted to the insulator 2a at least at one position 1a of the monitor positions, and the amount of salt deposited on the insulator 2a is measured on the basis of a light transmission amount through the optical waveguide. Then, the amount of deposited salt so measured at the one position 1a is is compared with the calculated amount of salt deposited on the insulators 2a to 2c. The amount of deposited salt calculated for other monitor positions 1b and 1c is corrected on the basis of the result of the comparison.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for monitoring salt damage to insulators, and more particularly to a salt damage monitoring system capable of accurately measuring and predicting the amount of salt attached at a plurality of locations in real time.

[0002]

2. Description of the Related Art Insulators are widely used as an electrical insulating member between a high voltage electric wire and a support tower. However, the environment in which the insulator is placed is harsh. For example, in industrial areas and coastal areas, salt (NaCl),
Dust, which is mainly composed of other inorganic substances, may be easily attached and polluted, which may lower the insulation withstand voltage of the insulator and cause a flashover accident or the like.

In order to prevent such a situation, it has been conventionally practiced to periodically quantitatively analyze a pollutant substance adhering to the surface of the insulator to obtain the polluted amount of the insulator.

By the way, as the fouling substances attached to the insulator, it is said that there are about 10 kinds of inorganic substances in addition to the salt content. Among them, especially the salt content causes a great deterioration of the insulator pressure of the insulator. There is. Therefore, when displaying the amount of fouling of insulators, it is convenient to use the amount of salt per unit area (equivalent amount of adhering salt) when it is assumed that the fouling substance is composed entirely of salt.

There are the following conventional methods for measuring the amount of deposited salt.

(1) Brush washing method A pilot insulator with the same material and shape as the insulator in actual operation,
The equivalent salt content is determined by setting it in a place to be measured, removing it after a predetermined period of time, cleaning the pollutant with a brush and measuring the electric conductivity of the cleaning liquid.

(2) Dew-point type pollution amount measuring method An electronic cooling element is incorporated in a pilot insulator, which is cooled to a temperature below the dew-point temperature to collect moisture in the air and forcibly moisten the pollutant attached to the insulator. Leakage resistance is measured in the condition where it is left. Next, the equivalent salt deposit amount of the pollutant is calculated by converting from the relationship between the leak resistance and the equivalent salt deposit amount that have been separately obtained.

(3) Ultrasonic cleaning-type fouling amount measuring method: The pilot insulator is put in a cleaning tank containing distilled water, the fouling substance is washed off by ultrasonic cleaning while rotating the insulator, and the cleaning liquid in which the fouling substance is dissolved is electrified. Conductivity is measured to determine the equivalent salt content.

(4) Spherical Simulated Insulator Method A spherical simulated insulator that always rotates gently is installed.
Wipe off the contaminants adhering to this with a wiper brush.
The fouling substances adhering to the wiper brush are washed off with a circulating cleaning liquid, the electric conductivity of this cleaning liquid is measured, and the converted equivalent salt content is determined.

[0010]

A large number of insulators are installed in Japan, and it is necessary to determine the amount of salt attached to the surface of the insulator at all installation locations. However, at present, insulators for salt damage measurement are not installed in all insulators.

The amount of salt adhered can be measured by measuring the wind speed, wind direction, and
It has been reported that the method of calculating by the relational expression with the rainfall amount has been studied for a long time through past experience and experience, and that it has been partially used. However, with this method, there is a difference in measurement accuracy depending on the individual environment and situation, and it is impossible to obtain an accurate salt adhesion amount under all conditions.

Further, by utilizing the results of the measurement by the above-mentioned methods (1) to (4), the amount of salt at the point where the insulator damage measuring device is installed is measured and evaluated. In addition, at some points where there is no insulator salt damage measuring device, wind speed, wind direction, and rainfall data are measured to predict the amount of salt adhering to the insulator surface by the above method. .

On the other hand, when the amount of salt on the surface of the insulator exceeds a preset reference value, it must be washed immediately. Therefore, it is necessary to predict the amount of salt attached to the surface of the insulator up to several hours later.

In order to monitor and predict salt damage and prevent accidents as in the above system, real-time measurement is required for measuring the amount of insulator salt content.

However, in the measuring instruments (1) to (4), the measuring time is several minutes to several tens of minutes, and the measuring time interval is the shortest, which is several tens of minutes to 1 to 2 hours. In a situation of rapid fouling, which is a problem due to salt damage, the measurement will be delayed, and when the essential data is grasped,
There are many cases in which a salt damage accident has already occurred. Furthermore, in order to monitor the amount of salt adhering to the insulator surface at multiple points,
It takes a very long time.

Further, when salt damage is predicted by the measuring instruments of (1) to (4), it takes a very long time for the same reason, and when actually predicted, the value is wrong. It has the drawback of (inaccuracy).

Therefore, an object of the present invention is to solve the above problems and to provide a salt damage monitoring system capable of accurately measuring and predicting the amount of salt attached at a plurality of places in real time.

[0018]

In order to achieve the above object, the present invention provides a system for monitoring salt damage caused by salt adhering to insulators of electric equipment such as power transmission lines. A meteorological measuring instrument for measuring meteorological data consisting of quantity is installed, and the salt adhesion amount of the insulator at each monitoring point is calculated based on this meteorological data, and an optical waveguide is attached to at least one of the above monitoring points. The amount of salt attached to the insulator is measured from the amount of light transmission of the optical waveguide, and the measured amount of salt attached is compared with the calculated amount of salt attached at this one location, and the result of the comparison is used to monitor another. The calculated salt adhering amount is corrected for the location.

Instead of the meteorological data, predicted amount of meteorological data ahead of a predetermined time may be used to calculate the salt deposition amount of the insulator ahead of a predetermined time.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, in the salt damage monitoring / prediction system of the present invention, the support tower is provided with an insulator as an electrically insulating member with respect to the high voltage electric wire. The pillar steel towers shown are all monitoring points 1a to 1c for salt damage monitoring. At these monitoring points 1a to 1c, meteorological measuring instruments (wind direction, wind speed, and rain gauge) 3a to 3c for measuring meteorological data including wind direction, wind speed, and precipitation are installed near the insulators 2a to 2c, respectively. And transmitters 4a-4c are installed. These transmitters 4a to 4c are connected to a central management unit 6 via a transmission line 5 such as a transmission optical fiber cord. The transmitters 4a to 4c are wind directions measured by the meteorological measuring devices 3a to 3c.
Meteorological data including wind speed and precipitation is transmitted to the central management unit 6.

Of the above monitoring points, one monitoring point 1a
2), an optical insulator salt damage sensor (FIG. 2) in which an optical waveguide is attached to the insulator 2a is provided, and the amount of salt adhering to the insulator 2a can be measured. Reference numeral 20 is a calculator unit. The transmitter 4a also sends the measurement result of the amount of deposited salt to the central management device 6.

The central management device 6 is provided with all the monitoring points 1a ...
1c is collectively monitored for salt damage. The central management unit 6 includes a receiver 7, an arithmetic processing unit 8 and a display unit 9.
It is composed of The receiver 7 has monitoring points 1a to 1c.
The weather data and the measurement results of the amount of deposited salt are received from the transmitters 4a to 4c. The arithmetic processing unit 8 is preliminarily input with the relational expression between the weather data of wind direction, wind speed, and rainfall and the amount of deposited salt, and the insulator 2a of each of the monitoring points 1a to 1c is based on the weather data from each of the monitoring points 1a to 1c. 2c is calculated, and the above relational expression is corrected based on the meteorological data from the monitoring point 1a to which the optical insulator salt damage sensor is attached and the salt adhesion amount. That is, the amount of deposited salt measured at this one location is compared with the amount of deposited salt calculated by the relational expression, and the amount of deposited salt calculated at the other monitoring points 1b and 1c can be corrected by the comparison result. The display unit 9 displays the amount of salt adhering to each of the monitoring points 1a to 1c. For example, the insulator of each of the monitoring points 1a to 1c is shown on the map, and the amount of adhering salt is displayed.

For details of the optical insulator salt damage sensor, as shown in FIG. 2, the optical waveguide 21 is mounted on the surface of the insulator 22, and the amount of salt attached to the insulator 22 is measured from the amount of light transmission of the optical waveguide 21. The arithmetic unit 20 is connected by an optical fiber cord. The optical waveguide 21 causes a loss of transmitted light when salt is attached to its surface. This optical waveguide 2
1 is attached so as to be exposed on the lower side of the insulator 22. The optical waveguide 21 is connected to a first optical fiber cord 24 and a second optical fiber cord 25 via an optical connector 23. In the arithmetic unit portion 20, the other end of the first optical fiber cord 24 is connected to the light source 26.
The other end of the second optical fiber cord 25 is connected to the light receiver 2
7 is connected. The light receiver 27 is connected to the calculator 28 via a lead wire.

Light is incident on one end of the optical waveguide 21 from the light source 26 via the first optical fiber cord 24, and
Light emitted from the other end is received by the light receiver 27 via the second optical fiber cord 25. The light reception signal of the light receiver 27 is processed by the calculator 28, and the salt deposition amount on the insulator surface can be calculated in real time by the relational expression between the light loss amount and the salt deposition amount obtained in advance. More than,
This is the principle of measuring the amount of salt adhering to the optical insulator salt damage sensor.

In the salt damage monitoring / prediction system shown in FIG. 1, the amount of salt attached to the surface of the insulator 2a is measured by the optical insulator salt damage sensor at one monitoring point 1a. The measured salt adhesion amount is transmitted to the transmitter 4a, and the transmitter 4a displays the salt adhesion amount measured by the optical insulator salt damage sensor and the wind direction / wind speed / rainfall measured by the wind direction / wind speed / rainfall meter in the central control unit 6 Send to.

In the central management unit 6, the arithmetic processing unit 8 is
The relationship between the amount of salt attached measured by the optical insulator salt damage sensor and the wind direction, wind speed, and rainfall measured by the wind direction, wind speed, and rain gauge, and the meteorological data of wind direction, wind speed, and rainfall that has been input in advance, and the amount of salt attached Correct the formula.

Since the measured value by the optical insulator salt damage sensor is an instantaneous measured result and the meteorological data is also an instantaneous measured result, mutual data can be evaluated in real time. Therefore, the correction coefficient found from this evaluation result is highly accurate, and it is clear that the salt deposition amount obtained by this correction is highly accurate.

On the other hand, at the other plural monitoring points 1b and 1c, the transmitters 4b and 4c are the wind direction, wind speed, and rain gauges 3b and 3c.
The wind direction, wind speed, and rainfall measured in step 3 are transmitted to the central management device 6. The central management unit 6 calculates the amount of salt adhering from the measured values of the wind direction, wind speed, and rainfall using the corrected relational expression. The display 9 shows the insulators of the monitoring points 1a to 1c on the map, and displays the amount of deposited salt.

Next, another embodiment will be described.

The predicted values of the wind direction, wind speed, and rainfall at the monitoring points (insulator installation points) 1a to 1c until several hours after the announcement by the Japan Meteorological Agency are received, and the arithmetic processing unit 9 is used by using these predicted values (predicted weather data). It is also possible to predict and calculate the amount of salt attached up to several hours later.

In the above-mentioned embodiment, the calculator 28 calculates the salt adhesion amount at the monitoring point 1a provided with the optical insulator salt damage sensor and transmits it to the central control unit 6, but the calculator 28 is provided at the monitoring point 1a. Instead, the light reception signal of the light receiver 27 is transmitted to the central control unit 6, and the arithmetic processing unit 8 of the central control unit 6 calculates the salt deposition amount instead of the arithmetic unit 28, and the same effect can be obtained.

A person who is qualified as a weather forecaster can publish local weather data. Therefore, instead of the forecasted weather data announced by the Japan Meteorological Agency up to several hours later, if the forecasted weather data up to several hours later by a person who is qualified as a weather forecaster is input, the same will be obtained in several hours later. It is possible to predict and calculate the amount of deposited salt.

[0034]

The present invention exhibits the following excellent effects.

(1) Since the salt deposition amount of the insulator is measured from the light transmission amount of the optical waveguide, the salt deposition amount can be accurately measured in real time, and the salt deposition amount calculated from the meteorological data based on the comparison result. Because the amount is corrected,
The amount of deposited salt can be accurately measured in real time at other locations as well.

(2) Similarly, the prediction of the amount of deposited salt using the predicted meteorological data becomes highly accurate.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a salt damage monitoring system showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an optical insulator salt damage sensor used in the present invention.

[Explanation of symbols]

 1a-1c Monitoring point 2a-2c Insulator 3a-3c Meteorological measuring instrument 6 Central management device

Claims (2)

[Claims] 1. In a system for monitoring salt damage in which salt adheres to insulators of electric equipment such as power transmission lines, a meteorological instrument for measuring meteorological data including wind direction, wind speed and precipitation is installed at a plurality of monitoring points, Based on this meteorological data, the salt adhesion amount of the insulator at each monitoring location is calculated, and an optical waveguide is attached to at least one insulator of the above monitoring location,
The amount of salt adhering to the insulator is measured from the amount of light transmission of this optical waveguide, and the measured amount of adhering salt and the amount of adhering salt calculated for this one location are compared, and the comparison result indicates that other monitoring points The salt damage monitoring system, wherein the calculated salt adhesion amount is corrected. 2. The salt damage monitoring system according to claim 1, wherein, instead of the meteorological data, the forecasted meteorological data at a predetermined time ahead is used to calculate the salt deposition amount of the insulator at a predetermined time ahead.