JPH10312722A - Insulator contamination detecting devices - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulator contamination detecting devices with a simple structure that can surely detect contamination on an insulator to prevent an accident in advance. SOLUTION: A groove 13 is formed on a surface of a rib section of a pilot insulator 1 placed in the same circumstance as that of an actual insulator to detect its contamination. The insulator contamination detecting devices is composed of a power supply to apply a high voltage to the pilot insulator 1 and a mean to measure a leakage current that flows on the pilot insulator 1. A structure of the pilot insulator with a rib section to which the groove is formed easily accumulates contamination materials, and a contaminating speed of the pilot insulator 1 becomes faster than that of the actual insulator. A contamination accumulating progress can be detected before a flash over due to the contamination accumulating progress of the actual insulator by applying a high voltage pulse periodically to the pilot insulator 1 to measure a leakage current that flows on the pilot insulator 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator fouling detecting device for detecting fouling of an insulator used in a transmission and substation equipment before the fouling of the insulator causes an accident.

[0002]

2. Description of the Related Art Insulators used for power transmission and transformation equipment and the like are deteriorated in insulation performance due to contamination of the surface thereof with contaminants, and in the worst case, an accident such as flashover occurs. In order to prevent such an accident, the contamination status of the insulator is measured by an insulator contamination detection device, and necessary measures such as cleaning of the insulator are taken before a flashover occurs.

Various devices have been proposed as this insulator fouling detecting device. A first example is a dew point fouling detector. In this method, a pilot insulator having the same shape as an insulator (actual insulator) whose contamination state is to be detected is prepared, and an electronic cooling element is incorporated in the pilot insulator. By arranging this pilot insulator in the same environment as the actual insulator, the pilot insulator will be in the same dirty state as the actual insulator. At the time of detecting contamination, the pilot insulator is cooled periodically by energizing the electronic cooling element of the pilot insulator to collect moisture in the air and forcibly wet the contaminants adhering to the pilot insulator. . As a result, the pilot insulator is in a state where the contamination is more advanced than the actual insulator.

In this state, a high voltage is applied to the pilot insulator, a leakage current flowing on the surface of the insulator is measured, and a contamination state of the insulator is determined from the measured leakage current. Here, when contamination is detected on the pilot insulator, it can be detected before the actual insulator is contaminated, and necessary measures such as cleaning of the actual insulator can be taken. The second example is SB (Steam
Bowl) type insulator fouling detector. This is because instead of incorporating an electronic cooling element in the pilot insulator, an evaporating dish is placed below the pilot insulator, and when detecting contamination, steam is generated from the evaporating dish to forcibly wet the lower surface of the insulator. It is to let.

[0005]

The above-mentioned conventional insulator fouling detector requires an electronic cooling element or an evaporating dish, so that its structure is complicated and is susceptible to seasonal or weather conditions. There is. When a PT (instrument transformer) is used as a power supply for applying a high voltage to a pilot insulator to measure leakage resistance, a large capacity PT is required to maintain a constant terminal voltage. There was a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an insulator fouling detection device capable of detecting fouling of an insulator and preventing occurrence of an accident beforehand, with a simple configuration and capable of reliably detecting fouling. I do. It is another object of the present invention to provide an insulator fouling detection device that can use a small-capacity power supply and thereby reduce the size of the device.

[0007]

According to the present invention, in order to achieve the above object, a groove is formed on an upper surface of a pleat of a pilot insulator which is arranged in the same environment as an insulator whose contamination is to be detected. The power supply for applying a high voltage to the pilot insulator and the means for measuring the leakage current flowing through the pilot insulator constitute an insulator fouling detection device.

[0008] The pilot insulator having a groove formed in the fold portion,
Contaminants tend to accumulate in the grooves, and the rate of fouling of the pilot insulator becomes faster than the rate of fouling of the actual insulator.
By periodically applying a high voltage to the pilot insulator and measuring the leakage current flowing through the pilot insulator, it is possible to detect the progress of the contamination before the flashover due to the progress of the contamination of the actual insulator.

According to the present invention, a device for humidifying the pilot insulator is not required unlike the above-mentioned conventional device, and the structure is simple, so that the cost can be reduced. In addition, since contamination can be detected without humidification, accurate detection can be performed without being affected by season or climate. Further, in the present invention, as a power supply for applying a high-voltage pulse, when using a single pulse power supply separated from the power line in the substation, it is possible to reduce the size of the high-voltage pulse generation circuit, The device can be downsized.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a circuit configuration of the insulator fouling detection device. FIG. 2 is a diagram showing a structure of a pilot insulator used in the apparatus of FIG. In FIG. 1, reference numeral 1 denotes a pilot insulator, and reference numeral 2 denotes a high-voltage pulse generating circuit for periodically applying a high-voltage pulse to the pilot insulator 1. The high-voltage pulse generation circuit 2 uses, for example, a battery power supply, and is a power supply independent of a section line of a real insulator.
Reference numeral 3 denotes a current transformer for detecting a leakage current flowing through the pilot insulator 1, and reference numeral 4 denotes a measurement circuit for measuring the leakage current detected by the current transformer 3. 5 is a judgment circuit for judging whether or not the pilot insulator is contaminated based on the measurement result of the measurement circuit 4, and 6 is an external signal when the judgment circuit 5 judges that the pilot insulator is contaminated. It is an external output circuit for outputting. Reference numeral 7 denotes a control circuit that controls the high-voltage pulse generation circuit 2 and the measurement circuit 4.

FIG. 2 shows the structure of the pilot insulator 1,
(A) is a side view, (b) is a top view. The pilot insulator 1 has the same shape as an actual insulator (not shown) for detecting a dirty state. Electrodes 11 and 12 are connected to the high-voltage pulse generator 2 shown in FIG. 1 and allow a leakage current to flow through the pilot insulator 1. 13 is
This is a groove formed over the entire circumference in the middle part of the upper surface of the insulator.

The pilot insulator 1 is arranged near an actual insulator used in a transmission and substation equipment, and is placed in substantially the same environment as the actual insulator. Therefore, the pilot insulator 1 receives the same pollutant as the actual insulator. However, since the groove 13 is formed, the contaminant tends to accumulate in the groove 13, and the contamination progresses faster than the actual insulator. The insulation performance tends to decrease.

The control circuit 7 periodically issues a command to the high voltage pulse generation circuit 2 and the measurement circuit 4. With this directive,
The high-voltage pulse generating circuit 2 includes an electrode 1 of the pilot insulator 1.
A high voltage pulse is applied between 1 and 12. As a result, a leakage current flows on the insulator surface according to the state of contamination. The current transformer 3 detects the leakage current, the measuring circuit 4 measures the leakage current, and outputs the measured value to the determination circuit 5. The determination circuit 5 compares a predetermined determination value with the measured value, and outputs a contamination detection signal from the external output circuit 6 when the leakage current value exceeds the determination value. When this stain detection signal is output, necessary measures such as cleaning of the actual insulator are taken.

According to the above-described example, the contamination of the actual insulator can be automatically detected at all times, and an accident due to the contamination of the insulator can be prevented. Further, according to the present example, the pilot insulator 1 is more likely to accumulate pollutants than the actual insulator, and the contamination progresses faster. Therefore, it is possible to detect the contamination before the flashover occurs in the actual insulator. Further, as compared with the conventional pilot insulator 1, the pilot insulator 1 of this embodiment has a simple structure in which only the groove 13 is provided on the upper surface thereof, so that the cost of the apparatus can be reduced.
Also, unlike the conventional apparatus, the pilot insulator 1 does not require humidification, so that a state in which the contamination is more advanced than the actual insulator can be obtained regardless of the season and the climate, so that the contamination of the actual insulator can be reliably detected can do.

As the high-voltage power supply for generating a leakage current in the pilot insulator 1, any one can be used. When the separated pulse power supply is used, the power supply device can be downsized, and the entire detection device can be downsized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a circuit configuration of an insulator fouling detection device to which the present invention is applied.

FIG. 2 is a view showing a structure of a pilot insulator in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pilot insulator 2 ... High voltage pulse generation circuit 3 ... Current transformer 4 ... Measurement circuit 5 ... Judgment circuit 6 ... External output circuit 7 ... Control circuit

Claims (2)

[Claims] 1. A pilot insulator disposed in the same environment as an insulator whose contamination is to be detected, wherein the pilot insulator has a groove formed on the upper surface of a fold thereof, and a power supply for applying a high voltage to the pilot insulator. Means for measuring leakage current flowing through the pilot insulator. 2. The insulator fouling detection device according to claim 1, wherein the power supply is a single pulsed power supply that is separated from a power line of the insulator.