JPH11352084A - Insulator stain detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulator stain detector capable of the stain degree of an insulator without using a pilot insulator. SOLUTION: A first rainwater collecting apparatus equipped with a rainwater receiver 4 for collecting rainwater flowing down along the surface of the insulator 1 for supporting a high voltage electric wire 2 and the first rainwater collecting container 6 for receiving collecting the rainwater received by the rainwater receiver 4 and a second rainwater collecting apparatus equipped with a rainwater receiver 4' for collecting rainwater which does not come into contact with the insulator and a second rainwater container 6' for collecting the rainwater received by the rainwater receiver 4' are provided. The conductivity of the water in the first rainwater container 6 and that of the water in the second rainwater collecting container 6' are detected, and from the difference between both conductivities, the degree of stain for the insulator is detected.

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 a fouling state of an insulator used for supporting a conductor to which a high voltage is applied in a power plant, a substation, or the like.

[0002]

2. Description of the Related Art Insulators used to support conductors to which high voltage is applied in power plants and substations, etc., are deteriorated in withstand voltage performance when they are contaminated by salt carried by typhoons or seasonal winds. Cause a flashover,
This causes a ground fault. Therefore, when the insulator becomes in a heavy soiled state, it is necessary to clean the surface of the insulator to restore the dielectric strength of the insulator.

[0003] As a detecting device for detecting a soiled state of an insulator, a dew-point type insulator fouling detecting device and an SB (Steam Bow) are known.
l) Insulator fouling detectors are known. The dew-point insulator fouling detector incorporates an electronic cooling element using the Peltier effect in a pilot insulator of the same shape as the actual insulator, cools the pilot insulator below the dew point temperature, collects moisture in the air, and This is a detection device for forcibly moistening adhering contaminants and measuring the leakage resistance of the contaminants.

[0004] Further, the SB type insulator fouling detection device is configured to forcibly wet the lower surface of the insulator cap with steam generated from an evaporating dish disposed below the insulator cap of a pilot having the same shape as that of the actual insulator. This device measures the leakage resistance of the lower surface of a shino-kasa.

[0005]

As described above, conventionally, it was necessary to use a pilot insulator having the same shape as an actual insulator in order to detect the contamination state of the insulator. There was a problem that the cost was high.

Further, in the conventional detecting device, since the pilot insulator is detected without detecting the contamination state of the fruit insulator directly, there is a problem that the detection of the contamination state is not reliable.

[0007] It is an object of the present invention to provide an apparatus for detecting contamination of an insulator so that a pilot can detect the degree of contamination of an insulator without using an insulator.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an insulator fouling detecting device for detecting the degree of fouling of an insulator used for supporting a conductor to which a high voltage is applied.

In the present invention, a first rain collecting device for collecting rainwater flowing down the surface of the insulator, a second rain collecting device for collecting rainfall not touching the insulator, and a first rain collecting device. A first conductivity detector that detects the conductivity of the collected rainwater and outputs a first conductivity detection signal; and a second conductivity detector that detects the conductivity of the rainwater collected by the second rain collector. A second conductivity detection device for outputting a conductivity detection signal; and a difference between the first conductivity detection signal and the second conductivity detection signal for determining a degree of contamination of the insulator and outputting a contamination state detection signal. And a fouling state determination device.

If the insulator is contaminated by salt damage, the salt attached to the surface of the insulator will dissolve into the rainwater flowing down the surface of the insulator when it rains. The conductivity of rainwater flowing down the surface of the insulator is higher than the conductivity of rainwater not touching the insulator.

[0011] Therefore, as described above, rainwater that has flowed down the surface of the insulator and rainwater that has not touched the insulator are collected, and when the difference in conductivity between the two types of rainwater is detected, the rainwater adheres to the insulator surface. It is possible to detect an increase in the conductivity of rainwater due to the dissolved salt, and to determine the degree of contamination of the insulator from the magnitude of the increase in the conductivity.

Although the degree of contamination of the insulator can be detected only from the conductivity of the rainwater that has flowed down the surface of the insulator, the degree of contamination of the insulator can be detected only from the conductivity of the rainwater that has flowed down the surface of the insulator. When the degree is detected, there is a problem that the degree of contamination is determined to be high even if the degree of contamination of the insulator is low when the concentration of salt contained in the rain that does not touch the insulator happens to be high. . On the other hand, as in the present invention, rainwater flowing down the surface of the insulator and rainwater not touching the insulator are collected, and the degree of contamination of the insulator is detected by detecting the difference in conductivity between the two types of rainwater. If it is detected, the degree of contamination of the insulator can be accurately detected even when the rainfall contains salt.

According to the present invention, since the degree of contamination of the fruit insulator can be detected without using a pilot insulator,
It is possible to reduce the size and cost of the insulator fouling detection device. Further, since the degree of contamination of the actual insulator itself can be directly detected instead of detecting the degree of contamination of the pilot, the reliability of detecting the contamination state of the insulator can be improved.

The first conductivity detection device includes, for example, a first detection electrode which is inserted into rainwater collected by the first rain collection device and is disposed to face the first detection electrode, and a first detection electrode of the pair. A first power supply unit for applying a constant voltage between the first power supply unit and a first conductive member having a magnitude corresponding to the detected current by detecting a current flowing between the pair of first detection electrodes from the first power supply unit; And a first current detection circuit that outputs a degree detection signal.

Further, the second conductivity detecting device is inserted into rainwater collected by the second rain collecting device to form a pair of the first conductivity detecting device.
A second power supply unit for applying a constant voltage between the pair of second detection electrodes, the second power supply unit applying a constant voltage between the second detection electrodes of the pair, and a second power supply And a second current detection circuit for detecting a current flowing from between the pair of second detection electrodes and outputting a second conductivity detection signal having a magnitude corresponding to the detected current.

Further, the above-mentioned pollution state determining apparatus comprises: a differential circuit for outputting a signal corresponding to a difference between the first conductivity detection signal and the second conductivity detection signal; A determination unit that determines a state and outputs a contamination state detection signal.

The first rain collecting device is disposed at a lower end side of the insulator, and receives a first rain water receiver that receives rain water flowing down the surface of the insulator, and receives the rain water received by the first rain water receiver. A first rain collection container,
It is preferable to perform an operation of discharging the rainwater in the rain collection container every time the amount of rainwater in the rain collection container reaches a certain value.

The second rain collecting device is disposed at a location remote from the insulator, and receives a second rain water receiver directly receiving rainfall, and a second rain water receiving device that receives the rain water received by the second rain water receiver.
, And the operation of discharging the rainwater in the rain collection container every time the amount of rainwater in the second rain collection container reaches a certain value can be performed.

In order to discharge the rainwater in each container each time the amount of rainwater in each container reaches a predetermined value, for example, each of the containers is rotatably supported as a rain container. It is arranged with the opening facing diagonally upward, and every time a certain amount of rainwater accumulates inside, it falls over to turn the opening downward and discharges the internal rainwater. It is preferable to use a container that collects and discharges a certain amount of rainwater in principle).

When such a rain collection container is used, after detecting the degree of contamination of the insulator, the rainwater collected in each rain collection container can be automatically discharged to prepare for the next detection. Therefore, it is possible to automatically monitor the contamination state of the insulator.

The method of discharging rainwater from the rain collecting container is not limited to the above method. For example, a liquid level detector for detecting the level of rain water collected inside the rain collecting container is provided. When the liquid level detector detects that the liquid level of the rainwater in the rain container reaches a predetermined level, the rainwater in the rain container is discharged by means such as opening a valve. Good.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the configuration of an insulator fouling detecting apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes an insulator for detecting the state of contamination by the contamination detection device according to the present invention, which is used for supporting the high-voltage wires 2 in a substation or the like. The illustrated insulator is a well-known line post having a structure in which a large number of caps 102, 102,... Arranged in the axial direction are protruded from the outer periphery of a solid cylindrical main body 101, and this insulator has a central axis. Are arranged in a state where they are oriented vertically, a columnar neck lower portion 103 formed at the lower end thereof is fixed to the gantry 3, and the overhead wire 2 is connected to the upper end thereof.

In the example shown in FIG. 1, near the lower end of the insulator 1, a first rain water receiver 4 for collecting rain water flowing down the surface of the insulator 1 is arranged. Rainwater receiver 4 shown
Are the inner peripheral wall 401 and the outer peripheral wall 4 whose inner surfaces have a conical surface shape.
02 and an annular container having a bottom wall portion 403 provided in a state inclined with respect to the horizontal plane. The rainwater catcher is a neck-shaped lower portion 103 at the lower end of the cylindrical insulator 1.
Are arranged to surround the. The outer diameter of the upper end of the outer peripheral wall 402 of the first rain water receiver 4 is set so as to collect only rainwater flowing down the surface of the insulator as much as possible and not to directly collect raindrops falling without touching the insulator. It is set to be slightly larger than the outer diameter of one bulk 102. Also, the inner peripheral wall 40 of the first rainwater receiver
The inner diameter of the upper end of the insulator 1 is set substantially equal to the outer diameter of the neck lower portion 103 of the insulator 1, and the upper end of the inner peripheral wall 401 is in close contact with the cylindrical portion of the insulator lower neck. An opening 4a is provided at the lowest point of the bottom wall 403 of the rainwater receiver 4, and the upper end of the first rainwater supply pipe 5 is connected to the opening 4a.

A first rain collection container 6 is arranged at a position further below the first rain water receiver 4. The illustrated first rain collection container 6 is formed of a bottomed cylinder having an opening 6a that is obliquely cut, and is rotatably supported by a support frame 7. The support frame 7 has a base 7a and a pair of support arms 7b, 7b standing upright from the base 7a. The support frame 7 is located below the first rain water receiver 4 and is directly exposed to rain. It is arranged in a position where there is no.

The first rain collection container 6 has an opening 6a at the upper end thereof facing upward between the support arms 7b and 7b, and an end on the bottom 6b side abuts on the base 7a. The rotating shafts 6c,
6c is fitted into the shaft support holes provided in the support arms 7b, 7b, respectively. Thereby, the first rain collection container 6
As shown in the drawing, a standby position where the opening 6a faces upward at a position higher than the bottom 6b, and the opening 6a
Is supported so as to be rotatable between a drain position in which the tip of the lower end is obliquely downward at a position lower than the bottom portion 6b.

In the illustrated example, the inclination angle of the end face of the opening 6a is such that the end face of the opening 6a is located substantially on a horizontal plane when the first rain collection container 6 is at the standby position as shown in the figure. Is set. When the liquid level of the rainwater collected in the first rain collection container 6 at the standby position is not at the set level set near the opening, the first rain collection container 6 is not shown. The first rain collection container 6 is held at the standby position, and when the amount of rainwater accumulated therein rises and its liquid level reaches a set level, the first rain collection container 6 rotates toward the drainage position to open its opening 6.
The position of the rotating shaft 6c is set so that a faces obliquely downward.

The lower end of the rainwater supply pipe 5 is positioned by a positioning means (not shown) so as to be located above the opening 6a of the first rain collection container 6 in which the opening is inclined upward. The rainwater collected by the rainwater receiver 4 is supplied through a rainwater supply pipe 5 into a rain collection container 6.

The above-mentioned rain-collecting container 6 is known to fall over, and performs the operation of accumulating rainwater inside and the operation of discharging the rainwater inside according to the same principle as Shishi. . That is, until the liquid level of the rainwater in the rain collection container 6 reaches the set level, the rain collection container 6 is in the standby position shown in FIG.
When the liquid level of the rainwater inside reaches the set level, it turns toward the drain position and drains the rainwater collected inside.

In the illustrated example, the first rain water receiver 4, the first rain water supply pipe 5, and the first rain collecting container (falling) 6 collect rain water flowing down the surface of the insulator,
A first rain collecting device is configured to perform an operation of discharging the collected rain water every time the amount of the collected rain water reaches a set value.

A pair of first detection electrodes 8, 8 which are opposed to each other at a predetermined distance from each other, are inserted into the first rain collection container 6. , A constant DC voltage is applied between the detection electrodes 8. In this example, the first resistor 10 detects a current flowing between the pair of detection electrodes 8 from the power supply unit 9 and outputs a first conductivity detection signal Vs having a magnitude corresponding to the detected current. The first current detection circuit 11 is configured.

When the level of the rainwater accumulated in the first rain collection container 6 rises and comes into contact with the detection electrodes 8, 8, the DC power supply 9
Current flows through the resistor 10 and the rainwater between the detection electrodes 8, 8, and a voltage corresponding to the current is generated across the resistor 10. The current flowing between the detection electrodes 8, 8 increases in proportion to the conductivity of the rainwater accumulated in the first rain collection container 5. Therefore, the voltage value of the first conductivity detection signal Vs generated at both ends of the resistor 10 increases in proportion to the conductivity of the rainwater in the rain collection container 5.

In the present invention, in order to collect rainwater not touching the insulator 1, a second rainwater receiver 4 'is disposed at a position away from the insulator 1. This rainwater catch 4
′ Comprises a container having an inverted conical peripheral wall portion 402 ′ and a bottom wall portion 403 ′ inclined with respect to a horizontal plane,
An opening 4a 'is provided at the lowest point of the bottom wall 403', and the upper end of the second rainwater supply pipe 5 'is connected to the opening 4a'.

At a position below the second rain water receiver 4 ',
Similarly to the first rain container, a second rain container 6 'having a bottomed cylindrical body having an opening 6a' obliquely cut is arranged. The second rain collection container 6 'is provided on a base 7a of the frame 7'.
′, Between the pair of support arms 7 b ′ and 7 b ′ standing upright, with the opening 6 a ′ at the upper end thereof facing upward and the end on the bottom 6 b ′ side contacting the base 7 a ′. The rotating shaft 6 is disposed obliquely in a state where the rotating shaft 6 is fixed to an intermediate portion thereof.
It is rotatably supported by support arms 7b 'and 7b' via c 'and 6c'.

The second rain collecting container 6 'has a standby position where the opening 6a' is upward at a position higher than the bottom 6b 'as shown, and a tip of the opening 6a'. It is supported so as to be rotatable between a lower position than the bottom portion 6b 'and a draining position which is inclined downward. The configuration and operation of the second rain container 6 'are the same as those of the first rain container 6.

The lower end of the second rainwater supply pipe 5 'is positioned so as to be located above the opening 6a' of the second rain collection container 6 'in which the opening is inclined upward. The rainwater collected by the second rainwater receiver 4 'is supplied into the rain collection container 6' through the rainwater supply pipe 5 '.

The second rain water receiver 4 ', the second rain water supply pipe 5', and the second rain collecting container (falling) 6 'collect rain water not touching the insulator (fall from the sky). A second rain collecting device is configured to perform an operation of discharging collected rain water every time the amount of collected rain water reaches a set value.

In the second rain collecting container 6 ', a pair of second detection electrodes 8 arranged so as to face each other at an interval equal to the interval between the first detection electrodes 8, 8 of the pair. , 8 'are inserted, and a constant DC voltage is applied between the detection electrodes 8', 8 'from the second power supply unit 9' through the second resistor 10 '. The voltage applied between the detection electrodes 8 'and 8' from the second power supply unit 9 'through the resistor 10' is equal to the voltage applied between the detection electrodes 8 and 8 from the first power supply unit 9 through the resistor 10. Is set. The resistance of the second resistor 10 ′ is set equal to the resistance of the first resistor 10.

In this example, the second resistor 10 'detects a current flowing from the second power supply unit 9' between the pair of second detection electrodes 8 'and 8', and a magnitude corresponding to the detected current. A second current detection circuit 11 ′ that outputs the second conductivity detection signal Vs ′ is configured. The current flowing between the pair of second detection electrodes 8 ′, 8 ′ increases in proportion to the conductivity of the rainwater collected in the second rain collection container 6 ′. 2 conductivity detection signal V
The voltage value of s 'increases in proportion to the conductivity of the rainwater in the second rain collection container 6' which is not touching the insulator.

The first conductivity detection signal Vs and the second conductivity detection signal Vs' are input to the differential circuit 12. The differential circuit 12 includes a differential amplifier and a subtraction circuit, and is proportional to the difference between the first conductivity detection signal Vs and the second conductivity detection signal Vs' (including a case where the proportionality constant is 1). )) The difference signal Vd is output.

The difference signal Vd is provided to the judgment section 13. The judging unit 13 compares the difference signal with a reference signal giving a predetermined judgment value, and when the level of the difference signal Vd exceeds the level of the reference signal, the insulator's stained state becomes a heavy stained state (flashover will occur if left as it is). (A state in which there is a possibility of occurrence) is provided to the output unit 14. When the stain detection signal Vo is given, the output unit 14 operates an alarm means indicating that the insulator is in a heavy-soil condition, or gives a washing command to a cleaning device (not shown) to wash the insulator. Or As an alarming means for indicating that the insulator is in a heavily soiled state, a light emitting display such as a lamp or a sounding means such as a buzzer can be used.

In the insulator fouling detector shown in FIG.
The relationship between the difference signal Vd output by the differential circuit 12 and the difference Δα between the conductivity of the water in the first rain collection container 6 and the conductivity of the water in the second rain collection container 6 ′ is shown. As shown in FIG. 2, the level of the difference signal Vd rises in proportion to the difference Δα in the conductivity of the rainwater in the rain collection containers 6, 6 ′. The determination unit 13 determines that the difference Δα between the conductivity of the water in the first rain collection container 6 and the conductivity of the water in the second rain collection container 6 ′ exceeds the set value Δαo, and the difference signal Vd
Is higher than the determination value Vr, the contamination detection signal Vo
Is output.

In the insulator fouling detector shown in FIG. 1, when the degree of fouling of the insulator 1 due to salt damage is low,
When there is rainfall, since the amount of salt contained in the rainwater collected in the rain collection container 6 is small, the first power supply unit 9 passes through the first resistor 10 and between the pair of first detection electrodes 8, 8. Whether the flowing current is equal to the current flowing from the second power supply unit 9 ′ through the resistor 10 ′ and between the pair of second detecting electrodes 8 ′, 8 ′,
Alternatively, it indicates a value slightly larger than the current flowing between the pair of second detection electrodes 8 ′, 8 ′. Therefore, the difference between the level of the first conductivity detection signal Vs and the level of the second conductivity detection signal Vs' is small, and the difference signal Vd output from the differential circuit 12 is lower than the level of the reference signal. Indicates a level. At this time, since the determination unit 13 does not generate a contamination detection signal indicating a heavy contamination state, the output unit 14 does not perform an alarm operation or the like.

On the other hand, when the insulator 1 is contaminated by salt damage and is in a heavyly contaminated state, when the rainfall occurs, the amount of salt contained in the rainwater collected in the rain collection container 6 is small, so that the first The current flowing from the power supply unit 9 to between the first resistor 10 and the first pair of detection electrodes 8 is changed from the second power supply unit 9 ′ to the second resistor 10 ′ and the second pair of detection electrodes 8. ´,
8 'is equal to or slightly larger than the current flowing through the second pair of detection electrodes 8' and 8 '. Therefore, the difference between the level of the first conductivity detection signal Vs and the level of the second conductivity detection signal Vs' increases, and the level of the difference signal Vd output from the differential circuit 12 exceeds the level of the reference signal. Therefore, the determination unit 13 generates a contamination detection signal indicating a heavy contamination state. At this time, the output unit 14 causes the warning means to perform a warning operation, or gives a cleaning command to a cleaning device for cleaning the insulator to perform the cleaning operation.

In the above example, when the difference signal Vd exceeds the level of the reference signal (the conductivity of the rain water in the first rain collection container 6 and the conductivity of the rain water in the second rain collection container 6 '). When the difference exceeds the determination value), a contamination detection signal Vs indicating that the insulator is in a heavy contamination state is generated, but the magnitude of the difference signal Vd itself indicates the degree of the insulator contamination. , Or by comparing the difference signal Vd with the levels of a plurality of reference signals having different levels (reference signals for providing a criterion for determining the degree of contamination) to determine the degree of contamination of the insulator, It is also possible to display stepwise such as "low stain", "medium stain", and "heavy stain".

As described above, rainwater flowing down the surface of the insulator 1 and rainwater not touching the insulator 1 are collected, and when a difference in conductivity between the two rainwaters is detected, the rainwater adheres to the surface of the insulator 1. Since the increase in the conductivity of the rainwater due to the dissolved salt can be detected, the degree of contamination of the insulator can be determined from the magnitude of the increase in the conductivity.

As described above, if rainwater flowing down the surface of the insulator and rainwater not touching the insulator are collected and the difference in conductivity between the two rainwaters is detected, the rainfall happens to be salty. Even if it is included, the degree of contamination of the insulator can be accurately detected.

In the above-described example, the rain collecting device is constituted by using the falling containers as the rain collecting containers 6 and 6 '. However, the rain collecting device used in the present invention is disposed on the lower end side of the insulator and the surface of the insulator is formed. A rainwater catcher for receiving rainwater flowing down and a rain collecting container for storing the rain water received by the rain catcher are provided. Each time the amount of water in the rain collecting container reaches a certain value, the water in the rain collecting container is drained. What is necessary is just to be comprised so that it may perform the operation | movement which discharge | emits, and it is not limited to the case where a fall is used as a rain collection container.

For example, as shown in FIG. 3, an opening 20 for receiving rainwater supplied through the first rainwater supply pipe 5 is provided.
When the amount of water accumulated in the rain collection container 20 reaches a set value using the first rain collection container 20 having a at the upper end and a drain port 20c opened and closed by the electromagnetic valve 20b at the lower end. The first rain collecting device may be a rain collecting device configured to discharge the water in the rain collecting container 20 by opening the valve 20b.

In the example shown in FIG. 3, the first rain container 20
A liquid level detector 21 that outputs a liquid level detection signal when detecting that the liquid level of the water in the rain collection container 20 has reached a set level is attached to a predetermined position near the upper end of the container. The output of the liquid level detector 21 is input to the valve control device 22. When the liquid level detection signal is given from the liquid level detector 21, the valve control device 22
After opening the electromagnetic valve 20b for a certain period of time necessary to drain all the water in the rain collection container 6, the valve 20
b is closed again.

In the example shown in FIG. 3, the second rain collecting device
An opening 20a 'for receiving rainwater supplied through the second rainwater supply pipe 5' is provided at an upper end, and an electromagnetic valve 20b 'is provided.
And a liquid level for outputting a liquid level detection signal when the level of water in the rain collection vessel 20 'reaches a set level. The level detector 21 'and the valve 2 according to the liquid level detection signal
1b by the valve control device 22 'for controlling the
It is configured in exactly the same way as the rain collecting device of the above.

The construction and operation of the other parts of the insulator fouling detecting device shown in FIG. 3 are the same as those of the example shown in FIG.

[0052]

As described above, according to the present invention, rainwater flowing down the surface of an insulator and rainwater not touching the insulator are collected to detect the difference in conductivity between the two rainwaters. Therefore, without being affected by the salt contained in the rainwater, it accurately detects the increase in the conductivity of the rainwater due to the dissolution of the salt attached to the insulator surface, and accurately determines the degree of contamination of the insulator. There is an advantage that can be detected.

Further, according to the present invention, since the degree of contamination of a fruit insulator can be detected without using a pilot, there is an advantage that the size of the insulator contamination detection device can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration example of an insulator fouling detection device according to the present invention.

FIG. 2 is a diagram showing the relationship between the difference between the conductivity of water collected by first and second rain collecting devices used in the fouling detection device according to the present invention and the output of a differential circuit.

FIG. 3 is a configuration diagram showing another configuration example of the insulator fouling detection device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulator 2 High voltage electric wire 3 Stand 4 First rainwater receiver 6,20 1st rain collection container 8 1st detection electrode 12 Differential circuit 4 '2nd rainwater receiver 6', 20 '2nd rain collection container 8 'second detection electrode

Claims (3)

[Claims] An insulator fouling detection device for detecting a fouling state of an insulator used to support a conductor to which a high voltage is applied, a first rain collecting device for collecting rainwater flowing down the insulator surface, A second rain collecting device that collects rain water not touching the insulator, and a first conductive device that detects a conductivity of the rain water collected by the first rain collecting device and outputs a first conductivity detection signal. A second conductivity detection device that detects the conductivity of rainwater collected by the second rain collection device and outputs a second conductivity detection signal; and the first conductivity detection. A detector for determining a degree of contamination of the insulator from a difference between the signal and the second conductivity detection signal and outputting a detection signal for detecting a contamination state. 2. An insulator fouling detection device for detecting a fouling state of an insulator used to support a conductor to which a high voltage is applied, wherein rainwater flowing down the surface of the insulator is collected in a first rain collection container. A first rain collector, a second rain collector that collects rainwater not in contact with the insulator in a second rain container, and a second rain collector that is inserted into the rainwater collected by the first rain collector. A pair of first detection electrodes arranged opposite to each other, and a first detection electrode of the pair.
A first power supply unit for applying a constant voltage between the detection electrodes of
A first current detection circuit that detects a current flowing from the first power supply unit between the pair of first detection electrodes and outputs a first conductivity detection signal having a magnitude corresponding to the detected current. A first conductivity detection device, and a second conductivity detection device, which is inserted into rainwater collected by the second rain collection device, and has a second pair of opposed pairs disposed at an interval equal to the interval between the first detection electrodes of the pair. And a second electrode of the pair
A second power supply unit for applying a constant voltage between the detection electrodes of
A second current detection circuit that detects a current flowing from the second power supply unit through the pair of second detection electrodes and outputs a second conductivity detection signal having a magnitude corresponding to the detected current. A second conductivity detection device, a differential circuit that outputs a signal corresponding to a difference between the first conductivity detection signal and the second conductivity detection signal, and an insulator based on an output of the differential circuit. And a determination unit for determining a soiled state of the above and outputting a soiled state detection signal. 3. The first rain collection device is disposed at a lower end side of the insulator, and receives a first rainwater receiver that receives rainwater flowing down the surface of the insulator, and the first rainwater receiver receives the first rainwater receiver. And a first rain collecting container for storing the rain water, the operation of discharging the rain water in the rain collecting container every time the amount of rain water in the first rain collecting container reaches a certain value. The second rain collection device is disposed at a location remote from the insulator, a second rainwater receiver for receiving rainwater not touching the insulator, and a rainwater received by the second rainwater receiver. A second rain collection container to be accommodated, and configured to perform an operation of discharging the rain water in the rain collection container every time the amount of rain water in the second rain collection container reaches a certain value. The insulator fouling detection device according to claim 1 or 2, wherein: