JP2009070638A - Faulty insulator detecting method and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a faulty insulator by measuring a shared voltage of an insulator simply and accurately. <P>SOLUTION: A faulty insulator detection device comprises an insulated hollow pipe 10, horns 13-1, 13-2 which are installed at the top end of the insulated hollow pipe 10 and measure potential differences at both ends of the insulator, sub-horns 14-1, 14-2 which are respectively provided in the vicinity of the horns 13-1, 13-2 and cancel potential differences which are generated between the horns 13-1, 13-2 and not necessary for measuring procedures for the measured potential, a pulse oscillation part 20, and signal processing output parts 25, 30, 40, 50. The pulse oscillation part 20 converts into a pulse signal the potential differences canceled of unnecessary potential differences and sends to the insulated hollow pipe 10. The signal processing output parts 25, 30, 40, 50 receive the pulse signal transmitted from the insulated hollow pipe 10 and calculate the shared voltage corresponding to the potential differences, and judge appropriateness of the shared voltage to output the judgement result. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a defective insulator detecting method and a defective insulator detecting apparatus for detecting a defective insulator in a power transmission line or the like.

  Conventionally, as one of the defect detection methods for an insulator provided in a power transmission line or the like, for example, as described in the following patent document or the like, in an insulator chain in which a plurality of insulators are connected, A method is known in which a pair of horns, which are contactors, are contacted between cap fittings, and the shared voltage of the insulators is measured to determine whether the insulator body is good or bad. In this defective insulator detection method, the voltage applied to both ends of the insulator string appears as a constant shared voltage in each insulator. However, if there is an insulator that has deteriorated due to deterioration, the shared voltage of the insulator is not normal. Since it is detected smaller than the shared voltage of the insulator, it is possible to detect the defect of the insulator.

Japanese Patent Laid-Open No. 3-176670 (Japanese Patent No. 2854352) Japanese Patent Laid-Open No. 5-281286

  In the acoustic pulse type defective insulator detection method described in Patent Document 1, a pair of horns are brought into contact with both ends of individual insulators in the insulator series to be measured, and the shared voltage is measured. Based on the measurement data, A Paschen curve is drawn and a defective insulator is determined from the state of the curve. In the defective insulator detection apparatus using this defective insulator detection method, the discharge voltage of the discharge tube is repeatedly generated in the analog acoustic pulse oscillating unit using the shared voltage of the insulator, and the repeated discharge is converted into an acoustic pulse signal by the speaker. The acoustic pulse signal propagates through the main body pipe constituting the defective insulator detecting device, and is converted into an electric signal by the receiving conversion unit at the end of the pipe, and the voltage of the converted signal is measured by an analog meter, The shared voltage can be grasped.

  When measuring the shared voltage of a series of insulators using such a defective insulator detector, for example, a pair of horns are brought into contact with both ends of one insulator, and the measured values displayed on the analog meter are measured. Then, the measured value is called to another worker, and the worker who receives it records the measured value in the ledger. When the measurement of the first insulator is completed, all the insulators are measured by sequentially performing the same operation.

  As described above, since the defective insulator detecting device is used at a high place such as a power transmission line for the purpose of use, three people are required for the work: a measurer, a meter reader, and a recorder. Moreover, since the shared voltage is read by an analog meter, a reading error may occur, and further, it takes time to create a Paschen curve and a report after measurement.

  On the other hand, in the defective insulator detection device described in Patent Document 2, a pair of horns are brought into contact with both ends of the insulator, an insulation resistance is measured by a detection circuit, and a transmission signal having a frequency according to the output voltage of the detection circuit. Is transmitted from the transmission circuit. The receiving circuit is configured to receive the transmitted signal in a space and convert the received signal into sound by a monitor speaker and output the sound. Thus, since the insulation resistance value detected by the detection circuit is transmitted to the outside by the transmission circuit, it can be safely measured. In addition, since a defective display sound is generated by the monitor speaker, the defective insulator can be reliably detected by listening to the sound. Therefore, there is an advantage that a defective insulator can be easily detected by at least two workers.

  However, the technique of the conventional patent document 2 has an advantage that the defective insulator can be easily detected by fewer workers than the technique of the patent document 1, but the defective insulator is detected by listening to the sound. Detailed measurement results such as the degree of deterioration of the measured insulator cannot be obtained. In addition, because the measurement is an unstable place with high steel towers etc., it is desirable that the measurement work environment be as simple as possible, and from the aspect of reducing maintenance costs (maintenance and inspection costs) However, since one person is desirable for measurement personnel, improvement has been desired.

  Therefore, the inventor of the present application, once operated the measurement start button, a defective insulator detection device that can automatically perform a series of measurements until the measurement of all the insulator series is completed without touching the operation unit. Proposed.

  However, when the defective insulator detecting device is automated, there is a problem that measurement data is displayed due to malfunction even if the insulator is not touched due to electrostatic induction due to strong electric field strength around the insulator string, particularly the arcing horn. This occurs because a strong electric field causes a potential difference due to an induced voltage between a pair of horns provided at the tip of the defective insulator detecting device. In this automatic measurement of shared voltage measurement, the measurement data does not become zero when moving to the next insulator measurement, so it may not move from the end of the previous insulator measurement to the start of the next insulator measurement. This is a cause of reduced efficiency. In other words, when the defective insulator detection device is automated, if a pair of horns are brought close to the actual operation insulator to be measured during measurement, an electromagnetic field due to high voltage is generated in the surroundings. Reacts and the work efficiency is lowered due to the adjustment.

  Therefore, it has been difficult to realize a defective insulator detection method and apparatus capable of detecting a defective insulator by measuring a shared voltage easily and accurately even by one worker.

  An object of the present invention is to provide a defective insulator detection method and apparatus capable of detecting a defective insulator by measuring a shared voltage easily and accurately even by one worker.

  In order to achieve the above object, the defective insulator detecting method of the present invention includes first to fourth processes.

  Here, in the first process, a first horn, a second horn, and a sub horn attached in the vicinity of the first or second horn are used, and the first and second horns are used. Then, it is brought into contact with both ends of the insulator to be measured, and the potential difference between the first and second horns which is unnecessary in the measurement procedure is canceled by the sub horn, and the potential difference between both ends of the insulator is measured. In the second process, the potential difference measured in the first process is converted into a periodic pulse signal corresponding to the magnitude and transmitted. In the third process, the pulse signal is received at a position away from the transmission location by a predetermined distance to detect a signal period of the pulse signal, and a shared voltage corresponding to the potential difference is calculated based on the detected signal period. calculate. Thereafter, in the fourth process, the appropriateness of the shared voltage is determined from the shared voltage calculated in the third process, and the determination result is output.

  In particular, in the method for detecting a defective insulator according to the present invention, a sub horn attached in the vicinity of the first or second horn is used, and in the first process, a measurement procedure that occurs between the first and second horns. An unnecessary potential difference is canceled and the potential difference between both ends of the insulator is measured.

  In order to achieve the above object, in the defective insulator detecting device of the present invention, a transmission medium having a predetermined length made of an insulating member for transmitting a pulse signal, first and second horns, a subhorn, And a pulse oscillation unit and a signal processing output unit.

  Here, the first and second horns are attached to one end of the transmission medium, and are used to measure a potential difference between both ends of the insulator by contacting both ends of the insulator to be measured. . The sub horn is juxtaposed in parallel with the axial direction of the first or second horn in the vicinity of the first or second horn, and is electrically connected to the first or second horn. Connected to the measured potential difference to generate a potential difference by canceling a potential difference that is unnecessary between the first and second horns in the measurement procedure.

  The pulse oscillating unit is attached to one end of the transmission medium, converts the generated potential difference into a periodic pulse signal corresponding to the magnitude thereof, and sends it to the transmission medium. . Furthermore, the signal processing output unit is attached to the other end of the transmission medium, receives the pulse signal transmitted from the transmission medium, detects the signal period of the pulse signal, and detects the detected signal period. A shared voltage corresponding to the generated potential difference is calculated based on the signal period, and the appropriateness of the shared voltage is determined from the calculated shared voltage and a determination result is output.

  In particular, in the defective insulator detection device of the present invention, a sub-horn is provided so as to cancel the potential difference that occurs between the first and second horns and is unnecessary for the measurement procedure, and to measure only the necessary shared voltage of the insulator. It is characterized by that. The position where the sub horn is provided may be basically any position as long as the potential difference unnecessary for the measurement procedure can be canceled.

  According to the defective insulator detecting method and the defective insulator detecting apparatus of the present invention, the potential difference which is unnecessary in the measurement procedure generated between the first and second horns using the sub horn attached in the vicinity of the first or second horn. Is canceled, so that malfunction due to electrostatic induction can be prevented. As a result, it is possible to improve workability by automation using digital signal processing, etc., and it is possible to reduce personnel during measurement, greatly reduce measurement time, simplify work after measurement, such as power transmission maintenance work Efficiency improvement and cost reduction can be expected.

  The above and other objects and novel features of the present invention will become more fully apparent when the following description of the preferred embodiment is read in conjunction with the accompanying drawings. However, the following drawings are for explanation only and do not limit the scope of the present invention.

  The feature of the defective insulator detecting device in Embodiment 1 of the present invention is that the processing of the measured shared voltage is automated by digital signal processing so that it can be easily measured by one worker, and the numerical value of the shared voltage is converted into a digital value. In addition, the work efficiency is improved by automating the start and end of the shared voltage measurement of individual insulators. In other words, once the measurement start button is operated, a series of measurements can be automatically performed until the measurement of all the insulators is completed without touching the operation unit. Also, the measurement method is changed from an analog type to a digital type.

  However, as described above, when the defective insulator detection device is automated, if a pair of horns are brought close to the actual operation insulator to be measured during measurement, an electromagnetic field due to high voltage is generated in the surrounding area, resulting in malfunction. As a result, the device reacts to the voltage, which may cause harmful effects. Therefore, in the first embodiment, in order to eliminate the adverse effects, a sub horn is provided at the tip of the horn for the purpose of canceling a voltage unnecessary for the measurement procedure. It can be measured without any problems. Hereinafter, the contents of the first embodiment will be described in detail.

(Overall configuration of defective insulator detection device)
FIG. 1 is an overall schematic configuration diagram of a defective insulator detecting apparatus showing a first embodiment of the present invention. Further, FIG. 2 is a schematic configuration diagram in which a part of the defective insulator detecting device of FIG. 1 is omitted.

  This defective insulator detecting device is a device that detects a defective insulator by measuring each shared voltage of a plurality of insulators 1a, 1b, 1c,. A transmission medium (for example, an insulating hollow pipe) 10 having a predetermined length made of an insulating member (for example, glass fiber reinforced plastic (FRP) or the like) for transmitting a pulse signal is provided. The insulating hollow pipe 10 is preferably handled in a structure that expands and contracts in several stages (for example, three stages). An insulating support member 11 made of an insulator or the like protrudes from a distal end portion 10 a that is one end portion of the insulating hollow pipe 10. The rear end of the first horn 13-1 made of an electrode rod is attached to the front end of the insulating support member 11 via the rotary shaft member 12. The tip of the first horn 13-1 is configured to rotate up and down by a predetermined angle with the rotary shaft member 12 as a fulcrum, and to be able to contact each insulator 1a, 1b, 1c,.

  A first sub-horn 14-1 having a predetermined length is formed on the outer peripheral surface of the tip portion 10a by winding a conductive tape or the like. A ring-shaped fixing member 15 having conductivity is attached to the outer peripheral portion of the insulating hollow pipe 10 located on the rear end side of the first sub horn 14-1, and the rotating shaft member 16 protrudes from the fixing member 15. It is installed. A rear end of a second horn 13-2 made of a substantially inverted L-shaped electrode rod is attached to the rotating shaft member 16. The rear end of the second horn 13-2 is electrically connected to the first sub horn 14-1 via the rotary shaft member 16 and the fixed member 15, and the tip of the second horn 13-2 is connected to the rear end of the second horn 13-2. The rotary shaft member 16 is rotated up and down by a predetermined angle using the fulcrum 16 as a fulcrum, and can be brought into contact with the insulators 1a, 1b, 1c,.

  In the vicinity of the horizontal portion of the substantially inverted L-shaped second horn 13-2, a second sub-horn 14-2 made of an electrode rod is disposed substantially parallel to the axial direction of the horizontal portion. . The second sub horn 14-2 is electrically connected to the first horn 13-1 by an inter-horn connecting cable 17. The entire second sub horn 14-2 and a part of the second horn 13-2 arranged in parallel with the second sub horn 14-2 are covered with an insulating cover 18 formed of resin or the like. Yes. The insulating cover 18 electrically insulates between the second sub horn 14-2 and the second horn 13-2.

  The first and second sub-horns 14-1 and 14-2, which are the first characteristics of the first embodiment, are measured between the first horn 13-1 and the second horn 13-2. It is provided to cancel the potential difference unnecessary for the procedure and to measure only the shared voltage of the insulator 1a,. The positions at which the first and second sub horns 14-1 and 14-2 are provided may be basically any positions as long as potential differences unnecessary for the measurement procedure can be canceled. As a result of the test or the like, the second sub horn 14-2 is preferably provided in the vicinity of the horizontal portion of the second horn 13-2 and substantially parallel to the horizontal portion.

  As in the first feature, by providing the second sub horn 14-2 in the vicinity of the second horn 13-2, the effect of canceling an unnecessary potential difference in the measurement procedure is excellent. There is a concern that a spark may occur between the second sub horn 14-2 and the second horn 13-2. For the purpose of completely removing this concern, as a second feature of the first embodiment, an insulator is interposed between the second sub horn 14-2 and the second horn 13-2. . Specifically, the second sub horn 14-2 and the second horn 13-2 are covered with the insulating cover 18, and the space between the second sub horn 14-2 and the second horn 13-2 is surely secured. Insulating structure.

  A pulse oscillating unit 20 is built in the front end portion 10 a of the insulating hollow pipe 10, and further, a pulse receiving unit (for example, a microphone) 25 and a signal processing unit 30 are provided on the rear end portion 10 b side of the insulating hollow pipe 10. A signal processing output unit including the display unit 40 and the operation unit 50 is mounted.

  The pulse oscillator 20 is electrically connected to the first and second horns 13-1 and 13-2 and the first and second subhorns 14-1 and 14-2, and the first horn 13-1 and When an inter-horn voltage (that is, a shared voltage) is generated between the second horn 13-2 and the second horn 13-2, it is driven by the inter-horn voltage, and a periodic pulse signal corresponding to the magnitude of the inter-horn voltage ( For example, a circuit for transmitting an acoustic pulse signal). The ground GND part of the pulse oscillating part 20 is used as, for example, the first sub horn 14-1.

  The microphone 25 is an acoustic / electric converter that is built in the rear end portion 10b of the insulated hollow pipe 10 and receives an acoustic pulse signal transmitted from the insulated hollow pipe 10 and converts it into an electrical pulse signal. Yes, the signal processing unit 30 is connected to the output side. The signal processing unit 30 is a circuit that detects a signal period of the electrical pulse signal and calculates a shared voltage corrected based on the detected signal period. The signal processing unit 30 includes a digital signal processing circuit, The display unit 40 is connected to the side.

  The display unit 40 is mounted on the outer peripheral surface of the insulated hollow pipe 10 and displays the calculated shared voltage, or determines whether the insulators 1a,... Are normal or defective from the shared voltage and displays the determination result. Or a circuit for displaying set values of measuring object insulator information (for example, steel tower number) and the like, and is constituted by a digital signal processing circuit. An operation unit 50 is connected to the display unit 40. The operation unit 50 is mounted on the outer peripheral surface of the insulated hollow pipe 10 and includes operation buttons for starting and canceling shared voltage measurement, setting measurement target information, and the like. The button operation is processed in the display unit 40. Is done.

(Circuit configuration of defective insulator detection device)
FIG. 3 is a schematic circuit configuration diagram showing the defective insulator detecting device of FIG.
The pulse oscillating unit 20 incorporated in the distal end portion 10a of the insulated hollow pipe 10 is a horn from the horns 13-1, 13-2, 14-1, 14-2 that are in contact with the insulator 1a to be measured. A shared voltage rectification unit 21 that converts the inter-voltage into direct current is included, and a pulse oscillation unit 22 is connected to the output side of the shared voltage rectification unit 21. The pulse oscillating unit 22 is a circuit for generating a periodic pulse signal corresponding to the output voltage of the shared voltage rectifying unit 21, and is composed of a voltage controlled oscillator or the like. A speaker 23 is connected to this output side. Yes. The speaker 23 is an electrical / acoustic converter that converts an electrical pulse signal output from the pulse oscillating unit 22 into an acoustic pulse signal and sends the acoustic pulse signal into the insulated hollow pipe 10.

  A microphone 25 is built in the rear end 10 b side of the insulating hollow pipe 10, and a signal processing unit 30 is connected to the output side of the microphone 25. The signal processing unit 30 includes a filter 31 and an amplifier (hereinafter referred to as “amplifier”) 32 for converting the electrical pulse signal output from the microphone 25 into an optimal sound waveform, and the output side of the amplifier 32. A multivibrator 33 is connected. The multivibrator 33 is an oscillator for generating a square-wave pulse signal from the output signal of the amplifier 32, and the display unit 40 is connected to the output side.

  The display unit 40 includes a microprocessor (hereinafter referred to as “microcomputer”) 41 for program-controlling the entire apparatus, a display unit main body 42 including a light emitting diode (LED) for displaying measurement results, measurement target information, and the like, A wireless antenna 43 for communicating with the ground display unit, a battery 44 for supplying power, and the like are provided. The microcomputer 41 includes a program memory 41a for storing a control program for automatically performing measurement, a data storage unit (for example, a data memory) 41b for storing a shared voltage calculation result, a pass / fail judgment result, and the like, a multivibrator 33, a pulse interval of a pulse signal output from 33, and a calculation unit (not shown) for calculating a shared voltage value from a correlation between a preset pulse interval and a shared voltage, and a control unit (not shown) for controlling the entire apparatus Etc. For example, a personal computer (hereinafter referred to as “personal computer”) is connected to the microcomputer 41 from the outside via a serial interface unit (not shown), so that the personal computer 41 can take in the data of the microcomputer 41. It has become.

(Reduction principle of electrostatic induction effect by subhorn)
In order to solve the problem of malfunction due to the influence of electrostatic induction so that the workability is not impaired, the feature of the first embodiment is that at least the induced voltage due to the influence of the surrounding electric field is provided on the second horn 13-2 side. A second sub horn 14-2, which is a detection auxiliary electrode, is attached, and the second sub horn 14-2 is connected to the first horn 13-1 by an inter-horn connection cable 17. As a result, the potential difference due to the induced voltage generated between the first and second horns 13-1 and 13-2 due to the influence of the surrounding electric field is reduced, and the display unit main body can be touched without touching the insulator 1a,. The phenomenon that data is displayed in 42 is canceled. In addition, if the 1st sub horn 14-1 is attached to the 1st horn 13-1 side and the 1st sub horn 14-1 is connected to the 2nd horn 13-2 via the rotating shaft member 16, The cancellation effect is increased. This principle will be described below.

FIG. 4 is a diagram for explaining the principle of the subhorn in FIG.
The case where the first and second horns 13-1 and 13-2 are not in contact with the insulator (A) and the case where they are in contact (B) will be described separately.

(A) When the first and second horns 13-1 and 13-2 are not in contact with the insulator As shown in FIG. 4, the potential of the first horn 13-1 is V1, and the second horn 13- When the potential of 2 is V2, the potential of the first sub horn 14-1 is V3, and the potential of the second sub horn 14-2 is V4, the following equation (1) is established.
V1 = V4, V2 = V3 (1)

  Ideally, if V2 = V4 and V1 = V3, V1 = V2 and the first and second horns 13-1 and 13-2 are at the same potential, and the potential difference becomes zero, causing malfunction. Does not appear. In order to satisfy the conditions of V2 = V4 and V1 = V3, the spatial positions of the first and second horns 13-1 and 13-2 and the first and second subhorns 14-1 and 14-2, The areas need to be the same, but physically impossible. In the first embodiment, therefore, the values of | V2-V4 | and | V1-V3 | approach the sub horns 14-2, 14- of the potentials V4, V3 so that the values approach to the level where no acoustic pulse signal is output. The length of 1 is adjusted.

(B) When the first and second horns 13-1 and 13-2 are in contact with the insulator When the horn is in contact with the insulator, V2> V4, V1> V3, and (V1-V2) Since the potential difference is input to the pulse oscillating unit 20, the shared voltage can be measured. However, it is considered that V2> V4 and V1> V3 may not hold when the shared voltage is low or when only the sub horns 14-1 and 14-2 are extremely close to the charged part of the insulator. In this case, the difference between | V2−V4 | and | V1−V3 | appears as an error. However, the error is small from the test result, and it may not be considered practically.

  In the defective insulator detecting apparatus shown in FIG. 1, the second horn 13-2 of the first and second horns 13-1 and 13-2 is connected to the first sub horn 14-1 on the ground GND side. The first sub horn 14-1 is close in position to the first horn 13-1. Therefore, if the voltage induced in the second sub horn 14-2 is guided to the first horn 13-1, the voltage induced in the first sub horn 14-1 on the ground GND side and the second sub horn 14- The potential difference Vb from the potential induced in 2 works in the direction of reducing the potential difference Va induced between the first and second horns 13-1 and 13-2.

That is, Va is the potential difference between the first and second horns 13-1 and 13-2, Vb is the potential difference between the first and second sub-horns 14-1 and 14-2, and the operating voltage of the pulse oscillator 20 is the same. Assuming Vd, no malfunction occurs when the relationship of the following equation (2) holds.
Va−Vb <Vd (2)

  In the first embodiment, in particular, the optimum size and size of the second sub horn 14-2, induction of the first and second horns 13-1 and 13-2, and the first sub horn 14-1 on the ground GND side. The balance of the voltage is important, and even if this is experimentally determined and an influence due to electrostatic induction occurs, the pulse oscillation unit 20 is reduced to a level at which no acoustic pulse signal is output. Further, when the first and second horns 13-1 and 13-2 are in contact with the insulator, the potential difference Vb between the second sub horn 14-2 and the first sub horn 14-1 on the ground GND side. Is at a level that does not affect defective lion judgment.

(Defective insulator detection method)
FIG. 5 is a flowchart showing a processing procedure of a defective insulator detecting method using the defective insulator detecting apparatus according to the first embodiment of the present invention.

  When a power switch (not shown) provided on the display unit 40 is pressed to turn on the power by the battery 44, the apparatus is started after being initialized and a detection operation is started (step S1). Before starting the measurement of the defective insulator, the setting button of the operation unit 50 is pressed, and the measurement object information of the insulator to be measured is input (step S2). The first and second horns 13-1 and 13-2 are brought into contact with both ends of the ground side insulator 1a in the insulator series 1 to be measured, and the shared voltage is measured (step S3). The measured shared voltage is rectified into a DC voltage by the shared voltage rectifier 21 in the pulse oscillating unit 20, converted into a pulse signal corresponding to the shared voltage by the pulse oscillating unit 22, and then converted into an acoustic pulse signal by the speaker 23. It is converted and sent from the front end portion 10a of the insulating hollow pipe 10 to the rear end portion 10b.

  The acoustic pulse signal sent to the rear end portion 10b of the insulating hollow pipe 10 is converted into an electrical pulse signal by the microphone 25, converted into an optimal sound waveform by the filter 31 and the amplifier 32, and then converted by the multivibrator 33. It is converted into a constant square wave pulse signal and sent to the microcomputer 41 in the display unit 40. The microcomputer 41 measures the shared voltage digitally by measuring the pulse interval of the pulse signal sent from the multivibrator 33, determines whether or not the measured shared voltage value is appropriate, and displays the display unit main body 42. The worker is notified by the display and sound (step S4). For example, when measuring shared voltage, if the second and subsequent insulators are within the specified range with respect to the previously measured shared voltage value, it is considered normal and if not, it is considered defective . The measured data is automatically stored in the data memory 41b in the microcomputer 41, and supports the creation of a report.

  An example of the measurement result of the insulator sharing voltage in FIG. 5 is shown in FIG. FIG. 6 shows, for example, the measurement results of the insulators whose insulator continuous position information is “inside”, the phase-specific information is “lower phase”, and the start / end point information is “young”.

  If there is a possibility that the measurement result in step S4 is defective, the process returns to step S3 so that there is no measurement error such as performing measurement again. If the measurement result is normal, it is determined whether or not the measurement of the insulator series 1 has been completed (step S5). If the measurement has not been completed, the process returns to step S3, and the insulator is moved from the ground side toward the line side. Do the same for the number of stations. In step S5, when it is determined that the measurement of the insulator series 1 is completed, it is determined whether or not the next insulator series is measured (step S6). If there is a next insulator series measurement, the process returns to step S2, and the same processing as described above is repeated. If there is no measurement of the next lever series, the defective lever detection process is terminated (step S7).

(Effect of Example 1)
According to the defective insulator detecting method and the defective insulator detecting apparatus of the first embodiment, there are the following effects (a) to (c).

  (A) First and second horns 13-1 are used by using first and second subhorns 14-1 and 14-2 attached in the vicinity of the first and second horns 13-1 and 13-2. , 13-2, the potential difference unnecessary for the measurement procedure is canceled, so that malfunction due to electrostatic induction can be prevented. As a result, it is possible to improve workability by automation using digital signal processing, etc., and it is possible to reduce personnel during measurement, greatly reduce measurement time, simplify work after measurement, such as power transmission maintenance work Efficiency improvement and cost reduction can be expected.

  (B) When an operation instruction for starting measurement is input from the operation unit 50 to the microcomputer 41, the measurement process is automatically performed as many times as the number of measurements corresponding to the number of insulators to be measured in accordance with the control program stored in the program memory 41a. Since the measurement is started, once the measurement is started and the measurement is started, the predetermined number of measurements (the number of measurements corresponding to the number of insulators to be measured) is finished. During this time, no manual operation is required. Therefore, the worker only needs to make measurements by sequentially bringing the first and second horns 13-1 and 13-2 into contact with the insulator to be measured in accordance with a signal generated according to the measurement process of the control program. Therefore, the measurement work becomes easy.

  (C) Conventionally, for example, with respect to the measured value measured, the measured value displayed on the display unit when the target insulator was measured was recorded, and the measured value was recorded in a record book or the like, and the recording was completed. Later, there was an inconvenience that it was necessary to move to the measurement of the next insulator to be measured and to repeat this operation. That is, since the measurement work is performed, for example, in an empty steel tower (a place where the danger of unstable scaffolding) is desired, it is desirable that the measurement work be as simple as possible. There was the disadvantage that multiple people were needed. On the other hand, in the first embodiment, the measured values are automatically stored in the data memory 41b in the microcomputer 41 at the time of measurement, and after measuring all the insulators in series, When it is convenient, the display unit main body 42 can confirm the operation unit 50 by operating the operation unit 50. Therefore, workability is good, and even one worker can work.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the whole schematic in the defect insulator detection apparatus which shows Example 1 of this invention. It is the schematic block diagram which abbreviate | omitted one part in the defect insulator detection apparatus of FIG. It is a schematic circuit block diagram which shows the defect insulator detection apparatus of FIG. It is a figure for demonstrating the principle of the subhorn in FIG. It is a flowchart which shows the process sequence of the defect insulator detection method using the defect insulator detection apparatus of Example 1 of this invention. It is a figure which shows the example of the measurement result of the insulator sharing voltage of FIG.

Explanation of symbols

1 insulator series 1a, 1b, 1c insulator 10 insulating hollow pipes 13-1, 13-2 first and second horns 14-1, 14-2 first and second subhorns 18 insulating cover 20 pulse oscillation unit 25 microphone 30 Signal Processing Unit 40 Display Unit 41 Microcomputer 42 Display Unit Body 50 Operation Unit

Claims (8)

Using a first horn, a second horn, and a sub horn attached in the vicinity of the first or second horn, the first and second horns are brought into contact with both ends of an insulator to be measured. A first process of measuring a potential difference between both ends of the insulator by canceling a potential difference unnecessary for measurement generated between the first and second horns with the sub horn;
A second process for converting the potential difference measured in the first process into a periodic pulse signal corresponding to the magnitude and transmitting the pulse signal;
A third process of receiving the pulse signal at a position away from the transmission location by a predetermined distance, detecting a signal period of the pulse signal, and calculating a shared voltage corresponding to the potential difference based on the detected signal period; ,
A fourth process for determining the appropriateness of the shared voltage from the shared voltage calculated in the third process and outputting a determination result;
A defective insulator detecting method characterized by comprising:   The defective insulator detecting method according to claim 1, wherein the third and fourth processes are executed by digital signal processing. The second, third and fourth processes are:
2. When a measurement start operation instruction is input, according to a control program stored in advance, the shared voltage of the insulator to be measured is automatically measured, and the measurement is repeated for a predetermined number of sheets. 2. The defective insulator detecting method according to 2. The shared voltage calculation result in the third process is automatically stored in the data storage unit according to the control program,
4. The defective insulator detecting method according to claim 3, wherein when an operation instruction for data output is input, the stored contents of the data storage unit are read and output according to the control program. A transmission medium having a predetermined length made of an insulating member for transmitting a pulse signal;
First and second horns mounted on one end of the transmission medium, for measuring a potential difference between both ends of the insulator in contact with both ends of the insulator to be measured;
In the vicinity of the first or second horn, it is juxtaposed in parallel with the axial direction of the first or second horn, and is electrically connected to the first or second horn, A sub horn for canceling a potential difference unnecessary for the measurement procedure generated between the first and second horns with respect to the measured potential difference;
A pulse oscillating unit that is attached to one end side of the transmission medium, converts it into a periodic pulse signal corresponding to the measured potential difference, and sends it to the transmission medium;
It is attached to the other end of the transmission medium, receives the pulse signal transmitted from the transmission medium, detects the signal period of the pulse signal, and measures the measurement based on the detected signal period A signal processing output unit that calculates a shared voltage corresponding to the potential difference, determines the appropriateness of the shared voltage from the calculated shared voltage, and outputs a determination result;
A defective insulator detecting device comprising:   6. The defective insulator detecting apparatus according to claim 5, wherein the transmission medium is an insulated hollow pipe. The defective insulator detecting device according to claim 6 further includes:
Covering the whole of the sub horn and a part of the first or second horn arranged in parallel to the sub horn, and electrically insulating the sub horn and the first or second horn. A defective insulator detecting device comprising an insulating cover. The pulse oscillation unit is built in one end of the insulating hollow pipe and is electrically connected to the first and second horns, and when the voltage between the first and second horns is generated, Driven by the inter-horn voltage, is configured to oscillate a periodic acoustic pulse signal according to the magnitude of the inter-horn voltage,
The signal processing output unit
A pulse receiving unit built in the other end of the insulated hollow pipe, receiving the acoustic pulse signal transmitted from the insulated hollow pipe and converting it into an electrical pulse signal;
A signal processing unit that is built in the other end of the insulated hollow pipe, detects a signal period of the electrical pulse signal, and calculates a shared voltage corresponding to the measured potential difference based on the detected signal period When,
A display unit that is mounted on the outer peripheral surface of the insulated hollow pipe, displays the calculated shared voltage, displays a determination result by determining the appropriateness of the shared voltage from the calculated shared voltage, and
An operation unit mounted on the outer peripheral surface of the insulated hollow pipe, at least for setting the measurement start and measurement target information of the shared voltage;
The defective insulator detecting apparatus according to claim 6 or 7, characterized by comprising:

Images