JPH01180470A - Measuring instrument for leakage current of insulator - Google Patents

Abstract

PURPOSE:To accurately measure a leakage current with simple, small-sized constitution by detecting the leakage current which flows in an insulator through a current collector provided on the insulator surface and detecting leakage current information by using an optical voltage sensor. CONSTITUTION:A current collection zone (conductive zone) 23 for colllecting and detecting the leakage current from a power distribution line is provided on the insulating surface of the insulator 20a. The leak current collector 21 is provided so as to detect the quantity of electrically collected on the conductive zone 23. The leakage current collector 21 has one end part connected electrically to the conductive zone 23 and the other end surface connected electrically to an insulator 22. A resistance R is provided between the leakage current collector 21 and a cap 24 so as to detect the information on the leakage current collected by the conductive zone 23 and leakage current collector 21. A voltage developed across the resistance R is detected by a voltage detector 27 which uses the optical voltage sensor. Information on the voltage detected by the voltage detector 27 is sent to a monitor device through an optical fiber 28.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an insulator leakage current measuring device, particularly a conductor used for suspending overhead power transmission and distribution lines on a steel tower that is a support structure, or in a power plant or substation. The present invention relates to the configuration of an apparatus for measuring leakage current in an insulator interlocking device used for electrically insulating the insulator, and thereby monitoring the amount of contamination of the insulator interlocking device.

[Prior Art] FIG. 8 is a diagram showing an example of an installation form of overhead power transmission and distribution lines. In FIG. 8, a power transmission line 1 that transmits electric power is suspended from steel towers R1, R2, and R3 via insulators 2a, 2b, and 2c. An overhead ground wire 3 is provided parallel to the power transmission line 1 for electrostatic shielding of the power transmission line.

Normally, when attaching a conductor to a support structure, it is necessary to use an insulator. Insulators are used as insulators for overhead power transmission lines.

Usually, an insulator such as ceramic is used as an insulator, but if this insulator becomes contaminated, its withstand voltage will drop significantly against AC voltage, so it is necessary to monitor the amount of contamination of this insulator. There is.

FIG. 9 is a diagram schematically showing a configuration for measuring leakage current of a conventional insulator chain device. In Fig. 9, insulator mounting W1
2 is connected to a steel tower arm 4 via a lead wire 5, for example. A conductor such as a power transmission line is suspended from the other end of the insulator chain device 2 . The lead wire 5 is provided with a current transformer CT for detecting the current flowing through the lead wire 5. This current transformer CT includes a core 6 for generating an induced current by a magnetic field induced by a current flowing through a lead wire 5;
It is composed of a coil 7 for detecting the current flowing through the core 6. The lead wire current detected by the current transformer CT is amplified by an amplifier 8 and then applied to an optical drive circuit 9. The optical drive circuit 9 causes a current responsive to the electrical signal from the amplifier 8 to flow through a light emitting diode (LED) 9a, and an optical signal having an intensity corresponding to the current flowing through the lead wire 5 from the light emitting diode 9a is generated. The optical signal generated by the light emitting diode 9a is transmitted via the optical fiber cable 10.

In the conventional leakage current measuring device shown in FIG. 9 described above, a configuration is also used in which an amplifier is not provided and the light emitting diode 9a is directly driven using the output of the current transformer CT. Next, the operation will be briefly explained.

When the insulator chain device 2 is hardly contaminated and maintains its insulation properties, almost no leakage current flows through the lead wire 5. As the contamination of the insulator interlock device 2 progresses, its withstand voltage characteristics deteriorate, and the conductor (
The current flowing from the power transmission line increases. This is because the steel tower arm 4 is grounded to the earth via the steel tower. A leakage current flowing through the lead wire 5 from this insulator chain device is detected by the current transformer CT, and is applied to the optical drive circuit 9 via the amplifier 8. The optical drive circuit 9 is a current transformer CT
A current corresponding to current information from the light emitting diode 9a is applied to the light emitting diode 9a. The light emitting diode 9a generates an optical signal with an intensity corresponding to the amount of current applied thereto, and transmits it via the optical fiber 10 to, for example, a monitoring station. The monitoring station monitors the optical signal provided via the optical fiber 10, that is, the leakage current information flowing through the lead wire 5, and determines whether or not the insulator chain device 2 is contaminated. If the amount of contamination of the insulator linkage device 2 is large and the leakage current flowing through the lead wire 5 is large, the central monitoring station immediately detects this and cleans the insulator linkage device 2.

Here, the insulator chain device 2 has a configuration in which a plurality of insulators are connected in series, and this means that the withstand voltage characteristics are better when a plurality of insulators are connected in series than when a single insulator is used. This is because

[Problems to be Solved by the Invention] This type of conventional leakage current measuring device uses a current transformer CT to detect the leakage current flowing through the insulator as described above. However, the range of leakage current that is subject to monitoring of the amount of contamination in the insulator is extremely small, approximately 1 milliampere to 150 milliamperes, and in order to detect leakage current in a current transformer, the core dimensions of the current transformer are not practical. The problem was that it had to be made so large that it no longer became a problem.

Furthermore, in a device having an amplifier for amplifying the output of the current transformer CT ratio, there is a problem in that a power source is required to operate the amplifier.

Furthermore, since a current transformer is used, a magnetic field is induced by the current flowing in the power line of the power transmission and distribution line suspended by the insulator chain device 2, and the magnetic flux of this induced magnetic field flows inside the core 6 of the current transformer CT. Since the magnetic flux crosses the insulator, it is impossible to distinguish between the magnetic flux generated by the leakage current and the magnetic flux caused by the power lines of the power transmission and distribution lines, and there is also the problem that the leakage current flowing through the insulator cannot be accurately measured.

Furthermore, measurement devices equipped with amplifiers may malfunction due to noise caused by electromagnetic induction from the power line, and cannot provide accurate current transformer detection information to the optical drive circuit 9, making it difficult to accurately detect the insulators. There was also the problem that the amount of contamination could not be detected.

Furthermore, if the insulator chain device breaks down for some reason and a large fault current flows through the lead wire 5, a correspondingly large signal will be given to the amplifier, optical drive circuit, and light emitting diode, and this large current will cause the optical There was also the problem that the drive circuit and light emitting diode could be destroyed.

Therefore, an object of the present invention is to eliminate the drawbacks of the above-mentioned conventional insulator leakage current measuring device, to accurately measure insulator leakage current with a simple configuration without using a current transformer, and thereby reduce the amount of insulator contamination. An object of the present invention is to provide an insulator leakage current measuring device capable of monitoring.

[Means for Solving the Problems] The insulator leakage current measuring device according to the present invention includes a conductive current collecting means that is electrically connected to the insulating surface of the insulator to collect the current flowing through the insulator; and detection means for detecting the amount of electricity collected by the current collecting means.

[Operation] The current collecting means provided on the surface of the insulator collects leakage current flowing through the insulator. The current detecting means detects the amount of electricity collected by the current collecting means. Therefore, by monitoring the current amount information detected by this current detection means, the leakage current flowing through the insulator can be easily and reliably detected without using a current transformer, and the amount of contamination of the insulator can be monitored. .

[Embodiment of the Invention] FIG. 1 is a diagram showing an example of the configuration of an insulator leakage current measuring device which is an embodiment of the present invention.

In FIG. 1, a plurality of insulators 20a, 20b-.

... are connected via a connecting jig 26 to the insulator chain device 2
The current collecting means of the present invention is provided on the insulating surface of the insulator 20a that is closest to the support structure.

The insulator 20a is connected to a supporting structure (for example, a steel tower arm) via a conductive cap 24 made of metal or the like and an insulator connection fitting 25 to prevent deterioration due to damage to the insulator.
mounted on.

A current collecting band 23 is provided on the insulating surface of the insulator 20a for collecting and detecting leakage current from the power transmission and distribution lines. The current collecting band 23 is provided by pasting or pressing a soft tape-like medium with excellent conductivity, such as copper, on the surface of the insulator 20a, which does not damage the surface of the insulator 20a.

A leakage current collector 21 is provided to detect the amount of electricity collected on the conductive band 23. One end of the leakage current collector 21 is electrically connected to the conductive band 23, and the other end is electrically connected to the insulator 22.

Therefore, the other end surface of the leakage current collector 21 is connected to the insulator connection device 2, the metal cap 24, and the insulator connection fitting 2.
It has a structure that is electrically insulated from 5. Insulator 2
2 is provided on the outer periphery of the cap 24.

The leakage current collector 21 has a structure in which the shape of the insulator 20a to be attached has a different radius between the part where the conductive band 23 is formed and the metal cap 24.
In order to compensate for this radius difference, a difference is provided in the internal radius, and the inside has a hollow structure. In order to detect leakage current information collected by the conductive band 23 and the leakage current collector 21, the leakage current collector 21 and the cap 24 are used.
A resistor R is provided between the two. The voltage generated across the resistor R is detected by a voltage detector 27 using an optical voltage sensor. Voltage information detected by the voltage detector 27 is sent to a monitoring device (not shown) via an optical fiber 28.

Here, the optical voltage sensor is electro-optical effect (Pockels effect)
This is a sensor that uses a sensor whose refractive index changes when the voltage changes, so that the voltage change can be extracted in the form of an optical signal, and has been conventionally used for boat fishing. As such a photovoltage sensor, a BSO sensor using a crystal such as Bi, Si, 0, etc. is used.

The leakage current collector 21 is usually constructed using a conductive elastic material such as conductive rubber, thereby preventing damage to the insulator and improving adhesion.

Here, the insulator 20a is an insulator made of ceramic or the like.
The resistance between the conductive band 23 and the metal cap 24 is much larger than the resistance value of the resistor R. Therefore, the leakage current from the power transmission and distribution line flowing through the insulator chain device 2 flows through this path with low impedance, that is, the path from the conductive band 23 to the current collector 21 to the resistor R to the metal cap 24. Become. The current flowing through this resistor R is converted into voltage by the resistor R, and this voltage information is sent to the voltage detector 27.
The configuration is such that it is detected by

FIG. 2 is a diagram showing an example of the configuration of the leakage current collector 21 shown in FIG. 1. FIG. 2(a) shows a plan view of the leakage current collector, and FIG. 2(b) shows its side view. Second
Referring to the figure, the leakage current collector 21 is divided into two parts, and the inner diameters of the upper end face and the lower end face are different. Moreover, the inside thereof has a hollow structure so that the resistor R and the voltage measuring device 27 can be housed therein. With such a divisible structure, it can be easily attached to the already installed insulator chain device 2 without adding any extra processing steps. The current collector 21 having such a structure that can be divided into two (or more) is crimped onto the insulator 20a by using, for example, a tightenable band structure on the outside thereof.

Although not clearly shown in the figure, by providing a shield cover for electrostatic shielding on the outside of the leakage current collector 21, it is possible to eliminate the influence of noise caused by electromagnetic induction from nearby power transmission and distribution lines. This enables accurate leakage current detection operations. As such an electrostatic shield cover material, metal foil such as copper, which is easy to process, can be used, and such material is pasted on the outer periphery of the current collector, or a conductive substance is applied to the electrostatic shield. The cover and the current collector band can also be made into an integral structure. Further, in the case of a divisible current collector, the band structure itself required for attaching the current collector 21 to the insulator 20a may have an electrostatic shielding function.

Furthermore, in the structure shown in FIG. 2, it has been explained that the current collector 21 is entirely made of a conductive elastic material, but instead of this, only the part that contacts the surface of the insulator 20a is made of a conductive elastic material, and the rest of the current collector 21 is made of a conductive elastic material. A current collecting structure can also be realized by using a conductor such as a metal in the part, and the same effect of collecting leakage current can be obtained.

By structuring the current collector 21 to cover the surface of the insulator 20a and the metal cap 24 as described above, it is possible to prevent the surface of the insulator 20a inside the current collector 21 from being contaminated, and reliable leakage current detection is possible. becomes.

Furthermore, if the surface of the part of the insulator 20a covered by the current collector 21 is contaminated for some reason, the insulation resistance (
When the impedance (impedance) decreases and there is no longer much difference in impedance with the part where the resistor R is provided, the leakage current flowing through the insulator linkage device 2 is transferred from the conductive band 23 to the resistor R.
- Path of metal cap 24 and conductive band 23 → insulator 20a
The leakage current is shunted to the path between the surface and the metal cap 24, and the leakage current cannot be accurately measured by measuring the voltage using the resistor R. As a method for preventing such contamination of the measurement surface, as shown in FIG. It is possible to apply a contamination-preventing substance such as silicon to the surface of the device, thereby eliminating the effects of external contamination. Here, in FIG. 3, the current collector 21 is omitted, and instead of providing the current collector 21, the current is collected by the current collecting band (conductive band) 23 using a lead wire 30 that is electrically connected to the conductive band 23. A configuration is shown for deriving the applied current information. By applying or disposing the contamination prevention substance in this manner, reliable leakage current measurement becomes possible.

FIG. 4 is a diagram showing a schematic configuration of a leakage current measuring device according to another embodiment of the present invention. In the configuration shown in FIG. 4, instead of the hollow structure current collector 21, the insulator 20a
Only a conductive band 23 is provided on the surface, and this conductive band 23 is electrically connected to a steel tower mounting bracket 50 via a lead wire 30. The insulator 20a is attached to a steel tower via a metal cap 24, an insulator connection fitting 25, and a steel tower mounting fitting 50. A resistor R is provided in series with the lead wire 30.

Optical voltage sensors 27 are provided at both ends of the resistor R to detect the voltage generated across the resistor R.

Optical voltage sensor 27 is driven by voltage detector 40 and derives leakage current information. The voltage detector (optical sensor drive section) 40 includes a light drive circuit 41 for generating a light signal of a predetermined intensity, and a light signal of a predetermined intensity in response to a current information signal from the light drive circuit 41. Electrical-to-optical converter (
light emitting diode) 41a. light emitting diode 41
The optical signal generated from the optical fiber 45a is applied to the optical signal generator 27 via the optical fiber 45a. The optical signal that has passed through the optical sensor 27 is applied to an optical-to-electrical converter 42a made of, for example, a photodiode via an optical fiber 45b. The electrical signal converted and guided by the optical-to-electrical converter 42a is outputted via the signal detection/amplification/arithmetic circuit 4'2. This detection/amplification/arithmetic circuit 42 converts the optical signal given from the optical voltage sensor 27 into an electrical signal by an optical-electrical converter 42a, amplifies this electrical signal, and performs a predetermined calculation (for example, a voltage value). detection or judgment of whether it exceeds the reference value) and outputs the result. In the configuration shown in FIG. 4 as described above, the impedance of the path from conductive band 23 to resistor R→lead wire 30 to tower mounting bracket 50 is as follows: conductive band 23→surface of insulator 20a→metal cap 24→ The impedance is much smaller than the path from the insulator connection fitting 25 to the tower mounting fitting 50. Therefore, as in the case of the leakage current detection device shown in FIG. 1, the leakage current flows to the lead wire 30 side, making it possible to reliably measure the leakage current. That is, since the metal cap 24, the insulator connection fitting 25, and the steel tower mounting fitting are usually made of a conductive material, their resistance value is small, but the impedance on the lead wire 30 side is lower due to the resistance value inherent to the metal. also gives high impedance. In particular, since the surface between the conductive band 23 and the metal cap 24 of the insulator 20a is an insulator, the impedance of the path is much larger than that of the lead wire 30 side.

The voltage detector 40 always provides an optical signal of a predetermined intensity to the optical voltage sensor 27 via the optical fiber 45a. When the voltage applied to an optical voltage sensor changes, the intensity of the optical signal it derives changes. This changed optical signal is transferred to the optical fiber 4.
5b to an optical-to-electrical converter 42a. Therefore, the electrical signal derived by the optical-to-electrical converter 42a corresponds to the voltage applied across the optical voltage sensor 27, that is, the voltage information generated across the resistor R, and therefore flows through the lead wire 30. Corresponds to leakage current. Since the leakage current flowing through this lead wire 30 corresponds to the leakage current from the power transmission and distribution line flowing through the insulator interlocking device 2, the signal detected by the detection/amplification/arithmetic circuit 42 corresponds to the leakage current information flowing through the insulator interlocking device 2. will be the value.

Here, in the configuration shown in FIG. 4, since there is no structure to prevent the surface of the insulator 20a from external contamination, the insulator 20a
The surface between the conductive band 23 and the metal cap 24 may become contaminated. In this case, the third
As shown in the figure, a drop in impedance on the surface of the insulator 20a can be prevented by coating or installing a contamination prevention substance such as silicon inside the insulator 20a. Also in this configuration, as in the case described in connection with FIG.
By providing a protective cover for preventing contamination and a protective cover for electrostatic shielding, it is possible to prevent erroneous measurements due to external influences. As such an electrostatic shielding structure, the insulator 20a
A desired effect can be obtained with a simple configuration by providing a protective cover for preventing contamination and applying or adhering an electromagnetic shield to the outside of the protective cover.

Further, in the above embodiment, the conductive band 23 is provided on the surface of the insulator 20a, but instead of this, a conductive band is formed on one end surface of the current collector 21, and the conductive band formed on one end surface of the current collector 21 is The same effects as in the above embodiments can be obtained even with a structure in which the band is brought into close contact with the surface of the insulator. Furthermore, collector 2
1 is in close contact with the metal cap via the insulator 22, but the insulator 22 can also be integrated with the current collector 21 to obtain the same effect as in the above embodiment.

As seen in Figures 1 and 3, the structure is such that a conductive band is provided on the surface of the insulator, but since this conductive band occupies only a small portion of the surface of the insulator, Indicates the leakage distance of the entire insulator linkage 2 (i.e., the distance from the live part (the part in contact with the power transmission/distribution line) to the grounded part (usually the supporting structure is a steel tower, which is grounded), and The effect on the distance between the surfaces of all insulators connected to the device is negligible, and there is no negative effect on the dielectric strength of the entire insulator chain, making it possible to reliably measure leakage current.

FIG. 5 is a diagram showing an example of a configuration in which a leakage current measuring device according to an embodiment of the present invention is installed on a power transmission/distribution line, and shows an example in a case where it is installed in a suspension tower. FIG. 5 shows an example of a suspension tower. Referring to Figure 5,
An insulator linking device 2 is attached to a steel tower arm 101 of a steel tower 100 via a tower mounting jig (this includes an insulator linking fitting and a steel tower mounting bracket) 201, and a power transmission and distribution line 1 is attached to this insulator linking device 2. is suspended. The insulator chain device 2 is provided with an arc horn 110 for causing a floodover caused by a lightning surge and moving a follow-on arc away from the insulator to prevent the insulator from being destroyed by arc heat. The power transmission and distribution line 1 is provided with a vibration absorbing damper 111 to prevent wire breakage due to vibration. The leakage current measuring device 20 of the present invention is installed between the insulator chain device 2 and the steel tower mounting jig 201.
0 is set. The signal from the leakage current measuring device 200 (
Since this uses a photoelectric sensor, it is output in the form of an optical signal) via the optical fiber 107 to the signal converter 106.
given to. The signal converted by the signal converter 106 is given to the joint box 103. The joint box 103 stores information (
After converting the ground wire current information, etc.) and information from the signal converter 106 into a predetermined signal format, the optical fiber composite overhead ground wire 1
02 to the monitoring station. In order to operate the signal converter 106 and the joint box 103, a solar cell 104 and a battery 105 powered by the solar cell 104 are provided.

The power from the battery 105 is also used as a power source for operating the leakage current measuring device 200 using a photovoltage sensor.

FIG. 6 is a diagram showing a schematic configuration of a leakage current measuring device according to an embodiment of the present invention applied to a tension tower structure. In the configuration shown in FIG. 6, the power transmission and distribution line 1 has two
suspended by. Each of the two insulator chain devices 2 is provided with a leakage current measuring device 200, and each leakage current measuring device 2 is provided with a leakage current measuring device 200.
An output signal of 00 is sent via optical fiber 107 to a signal converter. In FIG. 6, parts corresponding to those in FIG. 5 are given the same reference numerals.

7A and 7B are diagrams showing in more detail a specific example of the mounting form of the leakage current measuring device of the present invention, and FIG.
Figure A shows the overall configuration of the mounting form, and Figure 7B shows the configuration of Figure 7A.
FIG. 3 is an enlarged view of the part shown within the broken line in the figure. Referring to FIG. 7A, a long insulator 401 is provided as an insulator chain device,
This insulator chain device 2 (401) has one ring 403.0
It is attached to the steel tower reading section 110 via the insulator connection fitting made of the clevis 402 and the steel tower mounting fitting 50.

The long insulator 401 is provided with an arc horn 110, and a cap 405 made of conductive rubber having a current collecting function is provided at this portion.
The information collected by 05 is transmitted via a coaxial cable 301 to the BSO, which integrates a photovoltage sensor drive circuit and an arithmetic circuit.
to the sensor box 450. The coaxial cable 301 provides leakage current information collected by the current collector made of the conductive rubber cap 405 to the BSO sensor box 450 without being affected by external electromagnetic noise.

BSO sensor box 450 converts current information given via coaxial cable 301 into a voltage signal, converts it into an optical signal, and then sends it out via optical fiber cable 302.

As shown in Figure 7B, in this configuration, a divided structure is not used as the current collector structure, but a conductive rubber that is highly workable and has excellent adhesion is used, and this structure also Effects similar to those of the above embodiment can be obtained. Also in this structure, a shield for electrostatic shielding and pollution prevention is provided on the outside (outer periphery). Furthermore, since conductive rubber is used as the current collecting means, it has excellent adhesion, so that it is possible to prevent internal contamination and to ensure electrical connection with the insulator surface.

Although the above embodiment has been described as an example of measuring leakage current from overhead power transmission and distribution lines attached to a steel tower, the leakage current detection device according to the present invention is not limited to this, and can be applied to insulators in substations and power plants. It can also be applied to connected equipment, and the amount of contamination can be accurately measured.

[Effects of the Invention] As described above, according to the present invention, in order to measure the amount of contamination of an insulator, which is an insulator for connecting a support structure and a conductor, a leakage current flowing through the insulator is provided on the surface of the insulator. This leakage current information is preferably detected using a photovoltage sensor. therefore,
Leakage current can be accurately measured with a simple and compact configuration without the need for a large-scale current transformer, and contamination of the insulator can be monitored.

That is, since no current transformer core is used, there is no electromagnetic noise due to electric fields or magnetic fields from power transmission and distribution lines, so accurate measurement is possible. In addition, in the preferred embodiment, the leakage current is converted to voltage using a resistor and measured without using an amplifier, which eliminates the need for a power supply to operate the conventional amplifier, making it compact. It is possible to operate with a power supply of

Furthermore, when leakage current is measured using a photovoltage sensor, the Pockels element that makes up the photovoltage sensor is made of an insulator, and in this case, the signal is also transmitted in the form of an optical signal via an optical fiber. Therefore, it is possible to carry out reliable measurements without being affected by disturbances due to electromagnetic induction even at locations with high electric fields. In addition, since the leakage current measurement part is made of an insulator (Pockels element), and an optical fiber cable, which is also an insulator, is used as the signal transmission path (leakage current detection information), the leakage current measurement device is Even if a large fault current flows through the installed insulator chain device, the measuring section will not be destroyed by the fault current.

Furthermore, by making the current collector separable, it can be easily attached to the currently installed insulator chain device without adding any extra steps.

As explained above, the leakage current in the insulator can be collected moment by moment in real time (i.e., when installed on a steel tower, the current information of the power transmission line is simultaneously sent out via the optical fiber composite overhead line at the signal converter joint box). Therefore, power transmission and distribution lines that pass through areas that are heavily contaminated by dust, such as near roads, industrial areas, and quarries, or that are supported by transmission and distribution line towers in areas that are prone to salt buildup from sea winds. By installing a leakage current measuring device according to the present invention in an insulator chain device and monitoring information from the measuring device, cleaning of the insulator chain device, which was conventionally performed periodically regardless of the contamination status of the insulator, can be eliminated. It becomes possible to clean the insulator chain device according to the contamination situation, and it becomes possible to save labor in terms of maintenance of power transmission and distribution lines and to always perform maintenance corresponding to the situation. In addition, since the insulators can be cleaned at an appropriate time, the amount of contamination closely related to leakage current has not been determined, and the timing of cleaning the insulators has been delayed, resulting in a drop in withstand voltage due to contamination of the insulator chain equipment. This will make it possible to prevent accidents that would otherwise occur due to insulation rupture and short circuits with power transmission and distribution line towers, leading to power outages.

Furthermore, by measuring the leakage current over a long period of time using the above-mentioned measuring device, we can also measure the surrounding weather information at the same time, and study the leakage current measurement information in combination with the weather information. In this case, it is possible to design an insulator chain device having anti-pollution characteristics suited to the area where the power transmission/distribution line is installed, and it is also possible to design the insulator chain device economically.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention. 1 is a diagram showing a schematic configuration of a leakage current measuring device. FIG. 2 is a diagram schematically showing the internal structure of the current collector shown in FIG. 1. Figure 3 is a diagram showing the surface structure of the insulator on which the current collecting band is provided.
FIG. 4 is a diagram showing the structure of the insulator surface when a tassel dyeing prevention material is provided. FIG. 4 is a diagram schematically showing the configuration of a leakage current measuring device according to another embodiment of the present invention. FIG. 5 is a diagram showing an example of a configuration in which a leakage current measuring device according to the present invention is installed on a power transmission and distribution line of a suspended steel tower. FIG. 6 is a diagram schematically showing an example of the mounting form when the leakage current measuring device of the present invention is mounted on a tension tower. 7th
FIG. A and FIG. 7B are diagrams showing an example of a configuration in which a leakage current measuring device according to the present invention is installed on a steel tower suspending an electric power transmission and distribution line. FIG. 8 is a diagram showing the overall schematic configuration of a power transmission and distribution line to which the present invention is applied. FIG. 9 is a diagram schematically showing the configuration of a conventional insulator leakage current measuring device. In the figure, 1 is a power transmission and distribution line, 2 is an insulator chain device, 20
, 20a, 20b are insulators, 21 is a current collector, 22 is an insulator, 23 is a current collecting band (conductive band), 24 is a metal cap,
25 is an insulator connection fitting, 27 is a leakage current detection device (voltage detection device using a photovoltage sensor), 40 is a voltage detection section,
30 is a lead wire. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 1 Figure 2 Figure 83 Figure S Figure 6 Figure 88

Claims (17)

[Claims] (1) A device for detecting a current flowing through an insulator for attaching a power transmission and distribution line to a support structure, the device being provided on the surface of the insulator so as to be electrically connected to the insulator; An insulator leakage current measuring device, comprising: a current collector that collects a flowing current; and a means that is coupled to the current collector and detects the current collected by the current collector. (2) The current collecting means is a conductor whose one end surface is electrically connected to the insulating surface of the insulator and the other end surface is electrically insulated from the insulator. The insulator leakage current measuring device described. (3) The insulator leakage current detection device according to claim 2, wherein the current collecting means is provided at a connecting portion between the support structure and the insulator. (4) The insulator leakage current detection device according to claim 2, wherein the one end surface of the current collecting means is electrically connected to the insulating surface of the insulator via a conductive elastic body. (5) The insulator leakage current detection device according to claim 2, wherein the current collecting means is made of a conductive elastic body. (6) The insulator leakage current detection device according to claim 2, wherein the current collecting means has a divisible structure. (7) The insulator leakage current detection device according to claim 2, wherein the current collecting means has a hollow structure so as to cover the connecting portion. (8) The insulator leakage current detection device according to claim 2, further comprising electrostatic shielding means provided on the outer periphery of the current collector for electrostatically shielding the current collector. (9) The current collecting means has a hollow structure that covers the insulator connecting portion, and the current detecting means is provided inside the current collecting means, the insulator leakage according to claim 2. Current measuring device. (10) The current detection means includes: a resistance means provided between the current collector means and the connecting portion of the insulator; and a voltage detection means for detecting a voltage generated across the resistance means. An insulator leakage current measuring device according to claim 2. (11) The insulator leakage current detection device according to claim 10, wherein the voltage detection means is a photovoltage detection device using an electro-optic effect. (12) The insulator leakage current measuring device according to claim 1, wherein the current collecting means is a conductive band formed on the surface of the insulator along its circumference. (13) The current detection means includes: a resistance means provided between the conductive band and a connecting portion of the support structure; and means for detecting a voltage generated across the resistance means. The insulator leakage current measuring device according to scope 12. (14) The insulator leakage current measuring device according to claim 12, wherein the voltage detection means is an optical voltage sensor using an electro-optic effect. (15) The insulator leakage current measuring device according to claim 12, further comprising a contamination prevention cover provided to cover the conductive band in order to prevent contamination of the conductive band from the outside. (16) The insulator leakage current measuring device according to claim 15, wherein the pollution prevention means further includes electrostatic shielding means for electrostatically shielding the conductive band. (17) The current collecting means is provided along the circumference of the insulator surface, and a contamination prevention means is further provided on the insulator surface portion between the insulator connecting portion and the current collecting means.
An insulator leakage current detection device according to claim 1.