JPH10197326A - Apparatus and method for discrimination of stain on insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate a stains on an insulator in an unmanned manner and to grasp an optimum time for a cleaning operation by a method wherein a noise level at a specified frequency out of waveform data on a noise generated from the insulator is compared with a noise level by an unstained insulator. SOLUTION: In a waveform recorder 11 which is attached to a transmission- line steel tower, a sensor 2 measures waveform data on a noise generated from an insulator, and a CPU 15 outputs transmission signal via a telephone 18 when the measured waveform data is abnormal. In an analyzer 21 which is installed inside a monitoring station, a noise comparison circuit 23 compares a noise level at a specific frequency out of waveform data received by a telephone 27 with a noise level by an unstained insulator. Then, a CPU 22 outputs a display signal when a comparison difference is abnormal at a prescribed value, and a display 24 displays a comparison result. In this manner, since the waveform recorder 11 which is attached to the transmission-line steel tower automatically informs the monitoring station of a stain on the insulator, the cleaning time of the insulator can be discriminated in an unmanned manner, and it is not required to investigate the stain degree of the insulator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a stain discriminating apparatus and a stain discriminating method for discriminating cleaning time of an insulator.

[0002]

2. Description of the Related Art An insulator is attached to a transmission line to insulate the line from the ground. If the surface of the insulator is contaminated by the adhesion of sea salt, dust, smoke, etc., the withstand voltage will decrease, causing a flashover, which will hinder power transmission and distribution, and the noise generated by the insulator will increase, resulting in noise pollution and May cause radio interference. Therefore, it is necessary to periodically clean the insulator.

[0003] Transmission line towers are often located in places such as forests where transportation is difficult and cleaning work is difficult.
It is desirable to be able to judge the cleaning time unattended, and to perform the cleaning operation only when the contamination has progressed to some extent and cleaning is necessary.

[0004] As a conventional method of judging the contamination of insulators, for example, a pilot insulator suspended on a transmission line tower is washed with a brush and distilled water, and the conductivity of the washing water is examined or chemical analysis is performed to check the contamination state. There is a method of making a distinction or measuring and measuring the noise due to the partial discharge of the insulator.

[0005]

However, in the former method, it is impossible to perform unmanned operation because human labor is required for the measurement work, and in the latter method, the sound pressure taking a waveform of all frequencies is measured. Therefore, it is difficult to distinguish between noise generated from the insulator and background noise such as insect squeal and wind sound, and it is difficult to make an accurate determination.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an insulator contamination discriminating apparatus and an insulator capable of discriminating contamination of an insulator by an unmanned person and knowing an optimum time for cleaning the insulator. An object of the present invention is to provide a method for determining contamination.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, an insulator contamination discriminating apparatus according to the present invention, as shown in FIG. 1, converts waveform data of noise generated from an insulator attached to a transmission line. A sensor 2 to be measured, a waveform comparison circuit 14 for comparing the waveform data with the waveform data of the non-fouling insulator,
A waveform recorder 11 having a CPU 15 that outputs a transmission signal when measured waveform data is abnormal and a transmitter 18 that transmits the waveform data based on the transmission signal is attached to a power transmission tower, and receives the waveform data. Receiver 27,
A noise comparison circuit 23 that compares the noise level at a specific frequency in the waveform data with the noise level of the non-fouling insulator;
CP that outputs a display signal when the comparison difference is equal to or greater than a predetermined value
An analyzer 21 having a U22 and a display 24 for displaying a comparison result based on the display signal is provided in the monitoring station.

[0008] Preferably, the transmitter and the receiver are telephones and are connected by telephone lines. In addition to a transmission method using a telephone line, for example, a mobile phone, satellite communication, wireless communication, and optical fiber communication can be used.

It is preferable that the specific frequency is a frequency equal to or lower than 1200 Hz and is an integral multiple of the energizing frequency. For example, 120, 180,
240, 300, 360 Hz, 100, 150, 200, 250, 300 Hz in the area where the power supply frequency is 50 Hz
Is preferred.

[0010] In order to achieve the above object, a method for determining contamination of an insulator according to the present invention measures waveform data of noise generated from an insulator attached to a transmission line and sends the waveform data to an analyzer in a monitoring station. Then, the noise level at a specific frequency in the waveform data is compared with the noise level of the non-fouling insulator, and when the comparison difference is equal to or greater than a predetermined value, the fouling of the insulator is automatically reported.

As shown in FIG. 3, non-fouling insulator noise at a frequency of 1200 Hz or less and an integral multiple of the conduction frequency (60 Hz) is superior to background noise. In the present invention, since the noise of the soiled insulator and the noise of the non-stained insulator measured at such a specific frequency are compared, there is no influence from the background noise, and the soiling of the insulator is not erroneously determined.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a block diagram showing an embodiment of an insulator fouling determination device to which the present invention is applied. The sensor unit 1 and the waveform recorder 11 are attached to a steel tower supporting a transmission line through which a current of a frequency of 60 Hz is insulated by an insulator, and an analyzer 2 is provided.
1 is provided at a monitoring station located at a location away from the power transmission tower.

The insulator noise sensor 2, the background noise sensor 3, the temperature and humidity meter 4 and the wind direction anemometer 5 of the sensor section 1 are connected to a detector 12 for detecting each measurement data in a waveform recorder 11. Is connected to an input processing unit 13 for converting data into an electric signal. The input processing section 13 is connected to a memory 16 for temporarily storing data and a waveform comparison circuit 14 for comparing the detected insulator noise waveform data with the non-stained insulator noise waveform data. Waveform comparison circuit 14
Is connected to the CPU 15 which outputs a transmission signal when the detected waveform data is abnormal. CPU1
Numeral 5 is connected via a memory 16 to a modem 17 and a telephone 18 which receive the transmission signal and transmit each data detected by each of the sensors 2, 3, 4, 5 to an analyzer 21 at a monitoring station.

In the analyzer 21, a telephone set 27 for receiving the data and a modem 26 are connected to a memory 25 for temporarily storing the received data. The memory 25 stores the frequencies 120, 180, 240 of the insulator noise waveform data. , 300, 3
Noise comparison circuit 2 for calculating the noise level of 60 Hz by fast Fourier transform and comparing it with the noise level of a non-fouling insulator
3 is connected. The noise comparison circuit 23 is connected to the CPU 22 that outputs a data display signal when the comparison difference is equal to or greater than a predetermined value. The CPU 22 is connected to a display 24 that displays the data by receiving the display signal.

FIG. 2 is a flowchart showing the operation procedure of the embodiment of the insulator contamination determining apparatus to which the present invention is applied. A measurement start instruction signal is sent by the telephone 27 according to a periodic instruction from the analyzer 21 of the monitoring station or an arbitrary instruction from the operator.
Is transmitted to the waveform recorder 11 by the CPU 15, the CPU 15 issues an instruction to the detector 12, and the insulator noise sensor 2, the background noise sensor 3, the temperature / humidity meter 4, and the anemometer 5 operate to start measurement (step). 101). The measured data is converted into an electric signal by the input processing unit 13 (Step 102), and is temporarily stored in the memory 16. Next, of those data,
The waveform data of the insulator noise is compared with the waveform data of the non-fouling insulator noise by the waveform comparison circuit 14 (step 103). If the measured waveform data is abnormal, a transmission signal is output from the CPU 15, and the modem 17 and the telephone 18 operates to transmit each data detected by each sensor 2, 3, 4, 5 to the analyzer 21 of the monitoring station (step 104).

Each transmitted data is received by the telephone 27 of the analyzer 21 (step 105) and is temporarily stored in the memory 16. Next, of the received waveform data, the noise level at specific frequencies 120, 180, 240, 300, and 360 Hz is calculated by the fast Fourier transform in the noise comparison circuit 23 (step 106) and compared with the noise level of the non-fouling insulator. If the comparison difference is equal to or greater than a predetermined value (step 107), a display signal is output from the CPU 22, and the calculated noise level and each of the sensors 2, 3, 4, 5, and 5 are output.
Each of the data detected in step (1) is displayed on the display 24 to notify the contamination of the insulator (step 108).

[0017]

As described in detail above, the insulator contamination determination apparatus of the present invention uses the waveform recorder attached to the transmission line tower to automatically report the insulator contamination to the monitoring station. It is not necessary to go to investigate the pollution degree of the insulator, and the insulator can be washed only when necessary, so that there is no waste. In addition, since it is not affected by the background noise, the contamination of the insulator and the cleaning time are not erroneously determined.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an insulator fouling determination device to which the present invention is applied.

FIG. 2 is a flowchart showing an operation procedure of the embodiment of the insulator fouling determination device to which the present invention is applied.

FIG. 3 is a diagram showing a noise level with respect to a frequency of a noise and a background noise generated from an insulator attached to a power transmission line having a conduction frequency of 60 Hz.

[Explanation of symbols]

1 is a sensor, 2 is an insulator noise sensor, 3 is a background noise sensor,
4 is a thermo-hygrometer, 5 is an anemometer, 11 is a waveform recorder, 1
2 is a detector, 13 is an input processing unit, 14 is a waveform comparison circuit,
15.22 is CPU, 16/25 is memory, 17/26
Is a modem, 18 and 27 are telephones, 21 is an analyzer, 23 is a noise comparison circuit, and 24 is a display.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroyuki Watanabe 5-33-14, Wakinoshima-cho, Tajimi-shi, Gifu (72) Inventor Nobutaka 857-51, Fukudome-cho, Matsuto-shi, Ishikawa (72) Inventor Minoru Watanabe Saitama 1-7-8 Fujimi Fujimi, Tsurugashima City 504, Wakaba Ekimae (72) Inventor Akira Uchiyama 1-1-8 Kosenba-cho, Kawagoe-shi, Saitama

Claims (4)

[Claims] 1. A sensor for measuring waveform data of noise generated from an insulator attached to a transmission line, a waveform comparison circuit for comparing the waveform data with waveform data of a non-fouling insulator,
A waveform recorder having a CPU that outputs a transmission signal when measured waveform data is abnormal and a transmitter that transmits the waveform data based on the transmission signal is attached to a power transmission tower, and a reception device that receives the waveform data A noise comparison circuit that compares a noise level at a specific frequency in the waveform data with a noise level of the non-staining insulator; a CPU that outputs a display signal when the comparison difference is equal to or greater than a predetermined value; An analyzer having a display for displaying a comparison result according to the above is provided in the monitoring station. 2. The apparatus according to claim 1, wherein the transmitter and the receiver are telephones and are connected by a telephone line. 3. The insulator fouling discriminating apparatus according to claim 1, wherein the specific frequency is a frequency equal to or less than 1200 Hz and an integral multiple of an energizing frequency. 4. A method of measuring waveform data of noise generated from an insulator attached to a transmission line, transmitting the waveform data to an analyzer in a monitoring station, and measuring a noise level at a specific frequency in the waveform data. Compared to the noise level of the fouled insulator,
An insulator contamination discrimination method characterized by automatically reporting insulator contamination when the comparison difference is equal to or greater than a predetermined value.