JP2012093178A - Electric wire abnormality detection method, connection device used for detecting abnormality of electric wire and electric wire abnormality detection system including the connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire abnormality detection method, a connection device used for detecting electric wire abnormality, and an electric wire abnormality detection system including the connection device that can detect abnormality of electric wires in an outage section to determine whether or not a tentative charging in the outage section can be carried out without confirming an accident site.SOLUTION: An electric wire abnormality detection method for detecting abnormality of electric wires 3, 3,... hung over certain steel towers 2, 2 comprises the steps of: forming a closed circuit R by connecting the steel towers 2, 2, and the electric wires 3, 3,...; and detecting abnormality of the electric wires 3, 3,... forming the closed circuit R according to a result of measuring a value of resistance of the closed circuit R when voltage is applied to the closed circuit R.

Description

  The present invention relates to an electric wire abnormality detection method for detecting an abnormality of an electric wire spanned between predetermined steel towers, a connection device used for detecting an abnormality of the electric wire, and an electric wire abnormality detection system including the connection device.

  Conventionally, when a ground fault has occurred in the power system, the power transmission line in which the ground fault has occurred stops the power transmission by interrupting the circuit breaker. Then, in order to identify the fault section of the power transmission line, the circuit breaker in the power cut section of the power transmission line is sequentially inserted, and the electric wire is trial-charged in order to determine the ground fault location. The trial charging is performed to determine whether or not the section is an accident section by temporarily transmitting power to the electric wire in the power outage section and determining whether or not the relay operates. That is, as a result of the trial charging, if the relay does not operate, it is determined that the trial-charged section is not an accident section. If the relay is activated as a result of the trial charge, it is determined that the trial-charged section is an accident section (see paragraph [0003] in Patent Document 1 and paragraphs [0002] to [0005] in Patent Document 2).

Japanese Patent Laid-Open No. 2004-96959 JP 2010-1115006 A

  However, depending on the situation of the site in the power outage section, confirmation of the site may be required before trial charging. This confirmation is performed mainly by the worker dispatched to the site visually confirming the electric wire in the power outage section. In particular, when the electric wire in the power outage section is located away from the power station or the like, it takes time to dispatch the worker to the site. As a result, it takes time until trial charging, and power transmission cannot be resumed quickly. In addition, repeated trial charging at the ground fault point may cause a short-circuit accident or the equipment may be affected. Needed to be done carefully. Therefore, it has been required to detect the abnormality of the electric wire in the power outage section without confirming the site and determine whether or not the trial charging in the power outage section is possible.

  Therefore, in view of the above-described problems, the present invention provides an electric wire abnormality detection method and an electric wire that can detect an abnormality of an electric wire in a power outage section in order to determine whether or not a trial charge can be performed in the power outage section without confirming the accident site. It is an object of the present invention to provide a connection device used for detecting an abnormality of a wire and an electric wire abnormality detection system including the connection device.

  An electric wire abnormality detection method according to the present invention is a method for detecting an abnormality of an electric wire spanned between predetermined steel towers, electrically connecting the steel tower and the electric wire to form a closed circuit, and An abnormality of the electric wire forming the closed circuit is detected from the result of measuring the current or resistance value of the closed circuit when a voltage is applied.

  According to such a configuration, a closed circuit is electrically formed by the steel tower, the electric wire, and the ground or an overhead ground wire by electrically connecting the steel tower and the electric wire, which are generally insulated with an insulator or the like. . Then, at the same time as or after connecting the steel tower and the electric wire, a voltage is applied to a predetermined location in the closed circuit to cause a current to flow. Next, the current flowing through this closed circuit or the value of the resistance on the closed circuit is measured, and the measured result is when the electric wire forming the closed circuit is in a normal state (a state in which no ground fault has occurred) The abnormality of the electric wire is detected depending on whether or not it is a normal value (normal value) flowing through the cable. That is, if the measured result is not a normal value (if it is an abnormal value (abnormal value)), it is detected that the electric wire is abnormal. If the measured result is a normal value, it is detected that the electric wire is normal. In this way, the operator can detect the abnormality of the electric wire in the power outage section without confirming the accident site, and can determine whether or not the trial charging in the power outage section is possible.

  In the connection device according to the present invention, an electrical closed circuit is formed by a steel tower and an electric wire laid between the steel towers, and the value of the current or resistance of the closed circuit when a voltage is applied to the closed circuit is measured. In order to detect abnormality of the electric wire which forms a closed circuit from a result, the connection part which electrically connects a steel tower and an electric wire is provided.

  According to such a configuration, the connection device including the connection portion is generally configured by electrically connecting a steel tower and an electric wire insulated with an insulator or the like by the steel tower, the electric wire, and the ground or an overhead ground wire. An electrically closed circuit can be formed. Then, at the same time as or after connecting the steel tower and the electric wire, a voltage is applied to a predetermined location in the closed circuit to cause a current to flow. Next, the value of the current or resistance flowing through the closed circuit is measured, and whether the measured result is a normal value that flows when the electric wire forming the closed circuit is in a normal state, An abnormality is detected. In this way, the connecting device makes it possible to form a closed circuit in order to detect an abnormality of the electric wire. And an operator can detect the abnormality of the electric wire of a power failure area, without confirming an accident site, and can judge the possibility of the trial charge of a power failure area.

  According to this invention, it is preferable that a connection part is comprised so that a connection with an electric wire can be cancelled | released. According to such a configuration, the connection unit electrically connects the electric wire and the steel tower only when detecting an abnormality in the electric wire, and detects that the electric wire is abnormal or detects that the electric wire is normal. When charging, the connection between the electric wire and the steel tower can be released.

  An electric wire abnormality detection system according to the present invention includes a plurality of steel towers provided at predetermined intervals, an electric wire spanned between the steel towers, and the connection device provided in the plurality of steel towers. A closed circuit is formed by electrically connecting a steel tower and an electric wire, and the abnormality of the electric wire forming the closed circuit is detected from the result of measuring the current or resistance value of the closed circuit when a voltage is applied to the closed circuit. It is configured to be possible.

  According to such a configuration, the connecting device is electrically closed circuit by the steel tower, the electric wire, and the ground or the overhead ground wire by electrically connecting the steel tower and the electric wire which are generally insulated by an insulator or the like. Form. And after connecting a steel tower and an electric wire, or after connecting, a connecting device applies a voltage to the predetermined location in this closed circuit, and sends an electric current. Next, the connecting device measures the current flowing through the closed circuit or the value of the resistance on the closed circuit, and the measured result indicates that the electric wire forming the closed circuit is in a normal state (a state in which no ground fault has occurred). The abnormality of the electric wire is detected by whether or not it is a normal value (normal value) that flows when In this way, the operator can detect the abnormality of the electric wire in the power outage section without confirming the accident site, and can determine whether or not the trial charging in the power outage section is possible.

  According to the present invention, it is preferable that a power supply unit that can apply a predetermined voltage to the electric wire is integrally provided in the connection device. According to such a configuration, it is possible to perform from the formation of a closed circuit to the application of a voltage to the closed circuit only by installing the connection device on the steel tower.

  As described above, according to the wire abnormality detection method, the connection device used for detecting the abnormality of the wire, and the wire abnormality detection system including the connection device, the power failure section test can be performed without checking the accident site. There is an excellent effect that it is possible to detect an abnormality of the electric wire in the power outage section in order to determine whether charging is possible.

1 shows an overall system diagram of a wire abnormality detection system according to a first embodiment. FIG. The schematic of the connection apparatus of the electric wire abnormality detection system which concerns on the embodiment is shown. The block diagram of the connection apparatus of the electric wire abnormality detection system which concerns on the embodiment is shown. The control flowchart of the electric wire abnormality detection system which concerns on the embodiment is shown. It is explanatory drawing explaining the closed circuit formed in the electric wire abnormality detection method which concerns on the embodiment, (a) is the time of the pattern 1, (b) shows the time of the pattern 2. FIG. It is explanatory drawing explaining the closed circuit formed in the electric wire abnormality detection method which concerns on the embodiment, (a) is the time of the pattern 3, (b) shows the time of the pattern 4. FIG. It is explanatory drawing explaining the closed circuit formed in the electric wire abnormality detection method which concerns on 2nd Embodiment, (a) is the time of the pattern 1, (b) shows the time of the pattern 2. FIG. It is explanatory drawing explaining the closed circuit formed in the electric wire abnormality detection method which concerns on the embodiment, (a) is the time of the pattern 3, (b) shows the time of the pattern 4. FIG. The schematic of the connection part of the connection apparatus which concerns on other embodiment is shown.

  1st Embodiment of the electric wire abnormality detection system which concerns on this invention is described, referring FIGS. 1-4. FIG. 1 is an example of an overall block diagram of an electric wire abnormality detection system 1 according to the embodiment. 2-4 is the schematic which shows in detail the connection apparatus 4 used in order to detect the abnormality of the electric wire of the electric wire abnormality detection system 1. FIG.

  First, the system outline | summary of the electric wire abnormality detection system 1 which concerns on this embodiment is demonstrated, referring FIG. When a ground fault occurs in the electric wires 3, 3,... Laid over the plurality of steel towers 2, 2,..., The power transmission line includes the electric wires 3, 3, etc. by operating a relay such as a ground fault relay. Power out the section. In such a case, an operator of a power plant such as a power plant or a substation identifies an accident section from a power outage section of the transmission line, and tries to resume power transmission by separating the accident section from the power transmission path. The electric wire abnormality detection system 1 according to the present invention determines whether or not a trial charge performed to identify an accident section from the power outage section is possible.

  The electric wire abnormality detection system 1 operates when an operator manually operates a remote monitoring device CU installed at a power station. The remote monitoring device CU is connected to the electric wire abnormality detection system 1. The remote monitoring device CU according to the present embodiment is connected to the optical fiber composite ground wire OPGW. The optical fiber composite ground wire OPGW is stretched over the steel towers 2, 2,. The optical fiber composite overhead ground wire OPGW is an overhead ground wire in which an optical fiber cable OPC is mounted inside a lightning protection ground wire (hereinafter referred to as “aerial ground wire”) GW.

  The electric wire abnormality detection system 1 electrically forms a closed circuit by the steel towers 2, 2,... And the electric wires 3, 3,. Next, the wire abnormality detection system 1 applies a voltage to the closed circuit and measures the resistance value of the closed circuit. The electric wire abnormality detection system 1 detects the presence or absence of abnormality of the electric wires 3, 3,... Forming the closed circuit from the result of measuring the resistance value of the closed circuit. The electric wire abnormality detection system 1 transmits the detection result of the presence or absence of abnormality of the electric wires 3, 3,... To the remote monitoring device CU. The operator of the power station can know the detection result from the remote monitoring device CU, and determines whether or not the trial charge is possible based on this result.

  Next, the system configuration of the electric wire abnormality detection system 1 according to the present embodiment will be described with reference to FIG. The electric wire abnormality detection system 1 according to the present embodiment includes a plurality of steel towers 2, 2,... Provided at predetermined intervals, and electric wires 3, 3,. Connection devices 4 and 4 provided in the plurality of steel towers 2, 2,.

  The steel towers 2, 2,... Are electrically conductive steel plate support structures for supporting the electric wires 3, 3,. Therefore, the steel towers 2, 2,... Are installed so that the current flowing through the overhead ground wire GW can escape to the ground G through the steel towers 2, 2,. The steel towers 2, 2,... Are composed of at least two places over which the electric wires 3, 3,. The steel towers 2, 2,... Do not have to be between the adjacent steel towers 2, 2,..., And include any two steel towers 2, 2,.

  An example in which the electric wires 3, 3,... Are three-phase, three-wire high-voltage power transmission lines or ultrahigh-voltage power transmission lines will be described. The electric wires 3, 3,... Are laid across the steel towers 2, 2,. The electric wires 3, 3,... Are so-called bare electric wires that are not coated for insulation protection. The wire abnormality detection system 1 is configured to detect the presence / absence of an abnormality for each of the wires 3, 3,... For any one phase of the three wires, and configured to detect the presence / absence of the abnormality for each wire. The

  The connection devices 4 and 4 will be described with reference to FIG. FIG. 2 is a schematic diagram of the connection device 4 according to the present embodiment. The connection device 4 includes a connection unit 5 that electrically connects the steel towers 2, 2,... And the electric wires 3, 3,..., And a control unit that controls the connection unit 5 to detect an abnormality in the electric wires 3, 3,. 6, a power supply unit 7 capable of applying a predetermined voltage to the electric wires 3, 3,...

  The connection portion 5 electrically connects the connection terminals 51 to the electric wires 3, 3,..., The arm 52 capable of extending the connection terminals 51 toward the electric wires 3, 3,. And a motor 53. Further, the connection part 5 is capable of releasing not only the connection with the electric wires 3, 3,.

  When the connection terminal 51 is pressed against the electric wires 3, 3,... From one direction, the connecting terminal 51 guides so that the electric wires 3, 3,. A terminal main body 55 connected to one end of the arm 52. The guide part 54 and the terminal body 55 are both conductive members, and are electrically connected to the electric wires 3, 3,. The guide portion 54 is a hollow portion configured such that one end of two planes is aligned and the other end side is separated. The guide portion 54 guides the electric wires 3, 3,... So that the positions of the electric wires 3, 3,. When the electric wires 3, 3,... Are brought into contact with the guide portion 54, the terminal main body 55 is connected to the arm 52 so that the electric wires 3, 3,.

  The arm 52 has a pinion 56 that is a gear connected to the shaft of the motor 53 and teeth corresponding to the pinion 56 so that the connection terminal 51 can be separated from and connected to the electric wires 3, 3. And an arm main body 58 having a rack 57. The pinion 56 and the rack 57 can connect / disconnect the connection terminal 51 to / from the electric wires 3, 3,... By converting the rotational force of the motor 53 into a linear motion.

  The motor 53 is configured so that the rotation direction of the rotation shaft can be selected by switching the connection with the power supply unit 7. For example, when the motor 53 selects connection so as to rotate in a predetermined direction A, the connection terminal 51 can be made to approach toward the electric wires 3, 3,. be able to. When the motor 53 selects the connection so as to rotate in the direction B opposite to the predetermined direction A, the connection terminal 51 can be separated from the electric wires 3, 3,... It can be driven until there is no (insulated) range.

  The control unit 6 will be described with reference to FIG. FIG. 3 is a block diagram mainly showing the control unit 6 of the connection device 4. The control unit 6 includes a signal transmission / reception unit 61 that transmits and receives signals to and from the remote monitoring device CU, a motor drive unit 62 that controls driving of the motor 53, and an energization unit 63 that applies the voltage of the power supply unit 7 to the arm 52. The resistance measurement unit 64 that measures the resistance value of the arm 52, and the detection unit 65 that detects the presence / absence of an abnormality in the electric wires 3, 3,... Based on the result measured by the resistance measurement unit 64.

  The signal transmission / reception unit 61 is an interface that can connect the optical fiber cable OPC of the optical fiber composite overhead ground wire OPGW to communicate with the remote monitoring device CU. When receiving the operation command from the remote monitoring device CU, the signal transmission / reception unit 61 transfers the operation command to the detection unit 65. Further, the signal transmission / reception unit 61 receives the detection result and the resistance value from the detection unit 65 and transfers them to the remote monitoring device CU.

  The motor drive unit 62 switches the power supply connection of the motor 53 so as to drive the motor 53 in a predetermined direction A (see FIG. 2) based on the first drive signal from the detection unit 65. The motor driving unit 62 drives the motor 53 in a predetermined direction A until the connection terminal 51 contacts the electric wires 3, 3. The motor drive unit 62 switches the power supply connection of the motor 53 so that the motor 53 is driven in the direction B opposite to the predetermined direction A (see FIG. 2) based on the second drive signal from the detection unit 65. The motor drive unit 62 drives the motor 53 in a direction B opposite to the predetermined direction A (see FIG. 2) to a range where the connection terminal 51 is not electrically affected (insulated) from the electric wires 3, 3,.

  The energizing unit 63 normally grounds the arm 52 to the tower 2 and based on the energizing signal from the detecting unit 65, the power unit 7 (specifically, described later) to apply the voltage of the power unit 7 to the arm 52. "Rechargeable battery 71"). The energizing unit 63 energizes a weak current by applying a predetermined voltage to the electric wires 3, 3. Here, the weak current is set to a value that can be measured by the resistance measuring unit 64 and uses direct current.

  The resistance measurement unit 64 is connected to the arm 52 in order to measure the resistance value of the arm 52, and transmits the resistance value to the detection unit 65.

  The detection unit 65 compares the resistance value measured by the resistance measurement unit 64 with the resistance value when the electric wire in the electric wire abnormality detection section is normal based on the preset operation command from the remote monitoring device CU. If it is within the allowable range, a detection result indicating that the electric wires 3, 3,... In the relevant section are normal and normal is detected. The result is transmitted to the signal transmission / reception unit 61. When a detection result indicating that there is an abnormality is detected, the detection unit 65 also transmits the detected resistance value to the signal transmission / reception unit 61.

  As shown in FIG. 2, the power supply unit 7 includes a rechargeable battery 71 having a storage battery capacity necessary for energizing the arm 52 and driving the motor 53, a charger 72 for charging the rechargeable battery 71, A solar panel 73. The power supply unit 7 is provided integrally with the connection device 4.

  The apparatus main body 8 houses a guide portion 81 that guides the movement of the arm main body 58 in the axial direction, an arm 52 of the connection portion 5, a motor 53, the control portion 6, a rechargeable battery 71 of the power supply portion 7, and a charger 72. A casing 82. When the arm 52 is extended, the apparatus main body 8 is fixed at the position of the steel tower 2 where the connection terminal 51 contacts the electric wire 2.

  Next, 1st Embodiment of the electric wire abnormality detection method which concerns on this invention is described, referring FIGS. 4-6. The wire abnormality detection method according to the first embodiment, as shown in FIGS. 5 and 6, in order to detect the presence or absence of abnormality of the electric wire 33 (wire abnormality detection section) spanned between the steel towers 21 and 22, The example which detects the presence or absence of the abnormality of the electric wire 33 by operating the connection apparatuses 4w1 and 4w2 of the both ends of the electric wire 33 installed in the steel tower 21 and the steel tower 22 is shown.

  First, it is assumed that an abnormality has occurred in the specific electric wires 31, 32, and 33 spanned between the plurality of towers 21 and 22 of the transmission line, the relay is activated, and a specific section has a power failure. The operator at the power station detects the presence / absence of an abnormality in the electric wires 31, 32, and 33 for each electric wire abnormality detection section in the power outage section in order to determine whether or not the trial charging is possible.

  First, the case where the presence or absence of abnormality of the w-phase electric wire 33 spanned between the steel towers 21 and 22 is detected will be described. The worker transmits an operation command to the connection devices 4w1 and 4w2 installed in the steel towers 21 and 22 on both sides of the electric wire abnormality detection section of the electric wire 33.

  As illustrated in FIG. 4, the connection devices 4w1 and 4w2 transfer the operation command to the detection unit 65 when the signal transmission / reception unit 61 receives the operation command (YES in S1). The detection unit 65 transmits the first drive signal to the motor drive unit 62 based on the operation command to drive the motor 53. As the motor 53 is driven, the connection terminal 51 approaches the electric wire 33 and is electrically connected. Since the connection terminal 51 is grounded to the tower 21 via the arm 52 and the energization part 63, the connection of the connection terminal 51 and the electric wire 33 causes the electric wire 33 and the steel tower 21 to be electrically connected. (S2).

  When the steel tower 21 and the electric wire 33 are electrically connected, the detection unit 65 transmits an energization signal to the energization unit 63 and switches the connection of the energization unit 63 so that the voltage of the rechargeable battery 71 is applied to the arm 52. (S3). The resistance measurement unit 64 measures the resistance value of the arm 52, and transmits the resistance value to the detection unit 65 (S4). The detection unit 65 compares the measured resistance value measured by the resistance measurement unit 64 with the normal value of resistance when the electric wire 33 in the electric wire abnormality detection section is normal (S5).

  If the measured value is within the normal value range (YES in S5), a detection result indicating that the electric wire 33 in the section is normal and normal is transmitted to the remote monitoring device CU (S6). If the measured value is out of the normal value range (NO in S5), a detection result indicating that the electric wire 33 in the section is abnormal is transmitted to the remote monitoring device CU (S7), and the measured value is also monitored by the remote monitoring device. Transmit to the CU (S8). The operator of the power station can know the detection result from the remote monitoring device CU, and can determine whether or not the trial charging is possible from the detection result. The operator similarly detects the presence or absence of an abnormality in the remaining electric wires 31 and 32 or the electric wires 31, 32 and 33 in other electric wire abnormality detection sections, and grasps the accident situation in the power outage section.

  When the detection of the presence / absence of the abnormality of the electric wire is completed, the detection unit 65 transmits a second drive signal to the motor drive unit 62 in preparation for the trial charge. When the motor drive unit 62 receives the second drive signal, the motor drive unit 62 switches the connection of the power supply of the motor 53 and drives it in the direction B opposite to the predetermined direction A. When the motor 53 is driven in the opposite direction B, the connection terminal 51 is separated from the electric wires 3, 3,..., And moved from the electric wires 3, 3,. Therefore, when the operator of the power station performs the trial charging, the connection between the steel towers 2, 2,... And the electric wires 3, 3,. It flows to the steel towers 2, 2,... Via 52 and is configured not to generate a ground fault.

  Next, a detection result for each state of the electric wire 33 in the electric wire abnormality detection section and a method for determining whether or not trial charging is possible will be described with reference to FIGS. 5 and 6. 5 and 6 show a current flow (closed circuit R) in the electric wire abnormality detection method according to the first embodiment.

  First, the case where the electric wire 33 is normal without any abnormality (pattern 1) will be described with reference to FIG. When the connection devices 4w1 and 4w2 are operated to electrically connect the steel towers 21 and 22 and the electric wires 33, closed circuits R11a and R11b indicated by dotted lines on the drawing are formed. The closed circuit R formed here is a first closed circuit R11a formed by the electric wire 33 in the electric wire abnormality detection section, the connection device 4w1, the steel tower 21, the ground G, the steel tower 22, and the connection device 4w2. And the second closed circuit R11b formed by the electric wire 33 in the electric wire abnormality detection section, the connection device 4w1, the steel tower 21, the overhead ground wire GW, the steel tower 22, and the connection device 4w2. . At this time, since the resistance value measured by the connecting device 4w1 is the resistance value of the electric wire 33 in the electric wire abnormality detection section, the detection unit 65 determines that the electric wire 33 in the electric wire abnormality detection section is normal and normal. (Detected). Therefore, the detection unit 65 transmits a detection signal indicating that the electric wire 33 in the electric wire abnormality detection section is normal and normal to the remote monitoring device CU.

  Next, the case where the predetermined portion x of the electric wire 33 is grounded (pattern 2) will be described with reference to FIG. When the steel towers 21 and 22 and the electric wire 33 are electrically connected in the same manner as in the pattern 1, a closed circuit R12 indicated by a dotted line is formed on the drawing. The closed circuit R12 formed here includes the connecting device 4w1 to which a voltage is applied, the electric wire 33 in the electric wire abnormality detection section to the ground fault occurrence point x, the connecting device 4w1, the steel tower 21, the ground G, the ground It is formed with the member (a crane, a tree, etc.) which has generated the entanglement. At this time, since the resistance value measured by the connection device 4w1 is different from the resistance value of the electric wire 33 in the electric wire abnormality detection section, the detection unit 65 determines that there is an abnormality in the electric wire 33 in the electric wire abnormality detection section (detection). Is done. Therefore, the detection unit 65 transmits a detection signal indicating that there is an abnormality in the electric wire 33 in the electric wire abnormality detection section to the remote monitoring device CU and also transmits a measurement value.

  Next, the case where the predetermined portion x of the electric wire 33 is disconnected (pattern 3) will be described with reference to FIG. When the steel towers 21 and 22 and the electric wire 33 are electrically connected in the same manner as the patterns 1 and 2, a closed circuit as shown by the patterns 1 and 2 is not formed. At this time, since the resistance value measured by the connecting device 4w1 is infinite and different from the resistance value of the electric wire 33 in the electric wire abnormality detection section, the detection unit 65 causes an abnormality in the electric wire 33 in the electric wire abnormality detection section. Is determined (detected). Therefore, the detection unit 65 transmits a detection signal indicating that there is an abnormality in the electric wire 33 in the electric wire abnormality detection section to the remote monitoring device CU and also transmits a measurement value.

  Next, the case where the predetermined portion x of the electric wire 33 is in contact with the predetermined portion x of the electric wire 32 and is short-circuited (pattern 4) will be described with reference to FIG. When the steel towers 21 and 22 and the electric wire 33 are electrically connected as in the patterns 1, 2, and 3, a closed circuit is not formed as in the pattern 3. Therefore, the detection result is the same as that of the pattern 3.

  The operator can determine whether or not the corresponding electric wire 33 may be subjected to trial charging based on the detection signal of the remote monitoring device CU. Further, the operator can also determine the cause of the accident from the measured value transmitted together with the detection signal.

  Next, 2nd Embodiment of the electric wire abnormality detection method which concerns on this invention is described, referring FIG.7 and FIG.8. Since the electric wire abnormality detection method according to the second embodiment uses the same system as the electric wire abnormality detection system 1 of the first embodiment, the description of the electric wire abnormality detection system is omitted, and only the electric wire abnormality detection method. explain. In the electric wire abnormality detection method, in order to detect the presence / absence of an abnormality in the wired electric wire 33 (electric wire abnormality detection section), the connection devices 4v1, 4v2 at both ends of the electric wire 32 and the electric wire 33 installed in the steel tower 21 and the steel tower 22 are used. , 4w1 and 4w2 are operated to detect the presence / absence of an abnormality in the electric wire 33.

  When a power outage occurs in a specific section of the transmission line, the operator of the power station detects the presence or absence of an abnormality in the electric wire for each electric wire abnormality detection section in order to determine whether or not the trial charging is possible. The operator gives an operation command to the connection devices 4v1, 4v2, 4w1, 4w2 installed in the v-phase wire 32 and the w-phase wire 33 of the steel towers 21, 22 on both sides of the wire abnormality detection section of the corresponding wire 33. Send.

  Each connection device 4v1, 4v2, 4w1, 4w2 forms a closed circuit R by electrically connecting the wires 32, 33 and the steel towers 21, 22 in the same manner as the wire abnormality detection method according to the first embodiment. From the result of measuring the resistance value of the closed circuit R when a voltage is applied to the closed circuit R, the presence or absence of an abnormality in the electric wires 32 and 33 forming the closed circuit R is detected. The operator at the power station can determine whether or not the trial charging is possible from the detection result.

  Next, a detection result for each state of the electric wire 33 in the electric wire abnormality detection section and a method for determining whether or not trial charging is possible will be described with reference to FIGS. 7 and 8. FIG.7 and FIG.8 shows the electric current flow (closed circuit R) at the time of the electric wire abnormality detection method which concerns on 2nd Embodiment.

  First, the case where the electric wire 33 is normal without any abnormality (pattern 1) will be described with reference to FIG. When the connecting devices 4v1, 4v2, 4w1, 4w2 are operated to electrically connect the steel towers 21, 22 and the electric wires 32, 33, a closed circuit R21 indicated by a dotted line in the drawing is formed. The closed circuit R21 formed here includes the electric wire 33 in the electric wire abnormality detection section, the connection device 4w1, the steel tower 21, the connection device 4v1, the electric wire 32 in the electric wire abnormality detection section, the connection device 4v2, and the steel tower 22. And the connecting device 4w2. At this time, since the resistance value measured by the connecting device 4w1 is the resistance value of the electric wire 33 in the electric wire abnormality detection section, the detection unit 65 determines that the electric wire 33 in the electric wire abnormality detection section is normal and normal. Is done. Therefore, the detection unit 65 transmits a detection signal indicating that the electric wire 33 in the electric wire abnormality detection section is normal and normal to the remote monitoring device CU.

  Next, the case where the predetermined part x of the electric wire 33 is grounded (pattern 2) will be described with reference to FIG. When the steel towers 21 and 22 and the electric wires 32 and 33 are electrically connected in the same manner as the pattern 1, a closed circuit R22 indicated by a dotted line is formed on the drawing. The closed circuit R22 formed here includes the connecting device 4w1 to which a voltage is applied, the electric wire 33 in the electric wire abnormality detection section to the ground fault occurrence point x, the connecting device 4w1, the steel tower 21, the ground G, the ground And a member generating the entanglement. At this time, since the resistance value measured by the connecting device 4w1 is different from the resistance value of the electric wire 33 in the electric wire abnormality detection section, the detection unit 65 determines that there is an abnormality in the electric wire 33 in the electric wire abnormality detection section. Therefore, the detection unit 65 transmits a detection signal indicating that there is an abnormality in the electric wire 33 in the electric wire abnormality detection section to the remote monitoring device CU and also transmits a measurement value.

  Next, a case where the predetermined portion x of the electric wire 33 is disconnected (pattern 3) will be described with reference to FIG. When the steel towers 21 and 22 and the electric wires 32 and 33 are electrically connected in the same manner as the patterns 1 and 2, a closed circuit as shown by the patterns 1 and 2 is not formed. At this time, since the resistance value measured by the connecting device 4w1 is infinite and different from the resistance value of the electric wire 33 in the electric wire abnormality detection section, the detection unit 65 causes an abnormality in the electric wire 33 in the electric wire abnormality detection section. It is judged that there is. Therefore, the detection unit 65 transmits a detection signal indicating that there is an abnormality in the electric wire 33 in the electric wire abnormality detection section to the remote monitoring device CU and also transmits a measurement value.

  Next, the case where the predetermined portion x of the electric wire 33 is in contact with the predetermined portion x of the electric wire 32 and is short-circuited (pattern 4) will be described with reference to FIG. When the steel towers 21 and 22 and the electric wires 32 and 33 are electrically connected in the same manner as the patterns 1, 2, and 3, a closed circuit R 24 indicated by a dotted line is formed on the drawing. The closed circuit R24 formed here includes the connecting device 4w1 applying voltage, the electric wire 33 in the electric wire abnormality detection section to the ground fault occurrence location x, the connecting device 4w1, the steel tower 21, the connecting device 4v1, It is formed by the connection device 4v1, the electric wire 32 in the electric wire abnormality detection section to the ground fault occurrence location x, and the member generating the ground fault. At this time, since the resistance value measured by the connecting device 4w1 is different from the resistance value of the electric wire 33 in the electric wire abnormality detection section, the detection unit 65 determines that there is an abnormality in the electric wire 33 in the electric wire abnormality detection section. Therefore, the detection unit 65 transmits a detection signal indicating that there is an abnormality in the electric wire 33 in the electric wire abnormality detection section to the remote monitoring device CU and also transmits a measurement value.

  The operator can determine whether or not the corresponding electric wire 33 may be subjected to trial charging based on the detection signal of the remote monitoring device CU. Further, the operator can also determine the cause of the accident from the measured value transmitted together with the detection signal.

  In this way, the steel towers 2, 2,... And the electric wires 3, 3,. And the ground G or the overhead ground wire GW between the steel towers 2, 2,. Then, after connecting the steel towers 2, 2,... And the electric wires 3, 3,..., A voltage is applied to a predetermined location in the closed circuit R and a current flows. Next, the resistance value on the closed circuit R is measured, and the measured result is that the electric wires 3, 3,... Forming the closed circuit R are in a normal state (a state in which no ground fault occurs). The abnormality of the electric wires 3, 3,... Is detected depending on whether it is a normal value that sometimes flows. That is, if the measured result is not a normal value (if it is an abnormal value), it is detected that the wires 3, 3,. If the measured result is a normal value, it is detected that the electric wires 3, 3,. In this way, the operator can detect the abnormality of the electric wires 3, 3,... In the power outage section without confirming the accident site, and can determine whether the trial charging in the power outage section is possible.

  Moreover, the connection apparatus 4 provided with the connection part 5 generally connects the steel towers 2, 2,... And the electric wires 3, 3,. ..., the electric wires 3, 3, ... and the ground G or the overhead ground wire GW can electrically form a closed circuit R.

  Moreover, the connection part 5 electrically connects the steel towers 2, 2,... And the electric wires 3, 3,... Only when detecting an abnormality in the electric wires 3, 3,. Is detected, or when the electrical wires 3, 3,... Are detected to be normal and the test charging is performed, the connection between the steel towers 2, 2,. be able to.

  Further, the connecting device 4 is provided with the power supply unit 7 integrally with the electric wires 3, 3,..., So that the connecting device 4 is simply installed on the steel towers 2, 2,. Up to the application of a voltage to.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  The wire abnormality detection system 1, the connection device 4, and the wire abnormality detection method according to the embodiment described above apply a voltage to the wires 3, 3, ... after connecting the steel towers 2, 2, ... and the wires 3, 3, .... Although the example to do was demonstrated, it is not limited to this. For example, a voltage is applied in advance to the connection terminal 51 or the arm 52, and the connection terminal 51 in a state where this voltage is applied is connected to the electric wires 3, 3,. ,... May be applied at the same time.

  The wire abnormality detection system 1, the connection device 4, and the wire abnormality detection method according to the above embodiment form a closed circuit R by connecting the steel towers 2, 2,. Although the example which measures the resistance value of the electric wires 3, 3, ... after applying a voltage to was demonstrated, it is not limited to this. For example, the resistance values of the electric wires 3, 3,... On the formed closed circuit R may be measured simultaneously with the application of voltage to the electric wires 3, 3,.

  The wire abnormality detection system 1, the connection device 4, and the wire abnormality detection method according to the embodiment are configured to measure the resistance value of the closed circuit R and detect the abnormality of the wires 3, 3,. An example has been described, but the present invention is not limited to this. For example, the connection device may be configured to measure a current flowing through the closed circuit R and detect an abnormality of the electric wires 3, 3,... From the current value.

  Although the connection apparatus 4 which concerns on the said embodiment demonstrated the example provided with the power supply part 7 integrally, it is not limited to this. That is, the power supply unit may be provided separately from the connection device.

  Although the electric wire abnormality detection system 1 and the electric wire abnormality detection method according to the above embodiment have been described with reference to an example in which the remote monitoring device CU is manually operated by a power station operator, the present invention is not limited thereto. For example, the remote monitoring device may be configured to be automatically operable based on the operation of the relay, and may be configured to be able to select automatic operation or manual operation.

  Although the connection apparatus 4 which concerns on the said embodiment demonstrated the example connected with the remote monitoring apparatus CU and the optical fiber composite overhead ground wire OPGW, it is not limited to this. For example, the connection device 4 includes a wireless communication device, and may be wirelessly connected to the remote monitoring device CU using the wireless communication device, or may be wiredly connected via a communication cable other than an optical fiber cable. May be. In such a case, the wire abnormality detection system 1 can be operated even when the overhead ground wire is the lightning protection ground wire itself not mounted with the optical fiber cable, and the wire abnormality detection method is applied. Will be able to.

  Although the connection apparatus 4 which concerns on the said embodiment demonstrated the example which supplies the electric power which the power supply part 7 generated with the solar panel 73 to the connection part 5 and the control part 6, it is not limited to this. For example, the power supply unit 7 may include a power supply device that generates electric power by an induced electromotive force from a conductive plate provided to face an electric wire or an overhead ground wire. Alternatively, the battery may be charged when the transmission line is normal, and a rechargeable battery having a charge capacity required for a predetermined number of operations may be provided, or only a battery that cannot be charged is provided for periodic inspection. You may make it replace with.

  Although the electric wire abnormality detection system 1, the connection apparatus 4, and the electric wire abnormality detection method which concern on the said embodiment demonstrated the example which forms the closed circuit R via the steel towers 2, 2, ... comprised with a steel frame, this steel tower is In the case of a system in which the current flowing through the overhead ground wire GW is released to the ground G by a ground wire, the connection device 4 may be connected to the ground wire to form a closed circuit.

  The connection device 4 according to the above embodiment may be provided with a drop-off preventing mechanism for preventing the rack 57 of the arm 52 from dropping from the device main body 8 in the guide portion 81 of the device main body 8. The drop prevention mechanism includes a switch and an alarm device so that an alarm is issued when the end of the arm 52 on the main body device 8 side reaches a predetermined position. The dropout prevention mechanism is configured to stop driving the motor 53 when an alarm is issued.

  In the connection device 4 according to the above embodiment, the example in which the guide portion 54 of the connection terminal 51 is configured to align one end of two planes and separate the other end side is described. However, the connection device 4 is not limited to this. Absent. For example, as shown in FIG. 9, the guide portion 54 a may further include an arc-shaped recess 59 in the plane portion so as to be able to contact over a predetermined range of the outer peripheral surface of the electric wire 3. By doing in this way, while being able to support the electric wire 3 under measurement stably (it can make it difficult to shift | deviate), it can make it easy to flow electricity by increasing the contact with the electric wire 3. FIG.

  Although the connection apparatus 4 which concerns on the said embodiment demonstrated the example connected with a jumper wire on drawing, it is not limited to this. However, the jumper wire is preferable because it is less susceptible to wind fluctuations because the length of the wire that is spanned between the towers is shorter than the length of the wire that spans between the steel towers. Further, in order to prevent the jumper wire from being shaken by the wind, a support insulator for fixing the position of the jumper wire may be provided, or a reinforcing member fixed to the clamp portion may be provided along the jumper wire. .

  Although the connection apparatus 4 which concerns on the said embodiment demonstrated the example in which the arm 52 was comprised with the pinion 56 and the rack 57 so that attachment / detachment with respect to the electric wire 3 was demonstrated, it is not limited to this. For example, the arm may be configured to be extendable and contractable like a telescopic pipe, and may be configured to be detachable from the electric wire 3.

  The connection device 4 according to the above embodiment may further include a configuration in which the connection terminal 51 is separated from the electric wire 3 and reappears again when the connection terminal 51 fails to connect to the electric wire 3. Further, the connection device 4 may be configured to attach a magnet to the connection terminal 51 so that the jumper wire can be connected by a magnetic force, or to approach the jumper wire while searching for the position of the jumper wire with a metal detector. It may be configured.

  Although the electric wire abnormality detection system 1 and the electric wire abnormality detection method according to the above embodiment have been described with reference to FIGS. 5 to 8 in which the connection device 4w1 performs voltage application and resistance measurement, the present invention is not limited thereto. Absent. For example, in the wire abnormality detection system and the wire abnormality detection method, the voltage may be applied only by the connection device 4w1, and the resistance may be measured by both the connection device 4w1 and the connection device 4w2.

  Although the electric wire abnormality detection system 1 and the electric wire abnormality detection method according to the above embodiment have been described with reference to an example in which voltage application and resistance measurement are performed by the connection devices 4 and 4 installed at both ends of the electric wire abnormality detection section. It is not limited to. For example, the electric wire abnormality detection system and the electric wire abnormality detection method can perform voltage application and resistance measurement with the connection devices 4, 4,... Installed in the electric wire abnormality detection section including both ends of the electric wire abnormality detection section. Good.

  DESCRIPTION OF SYMBOLS 1 ... Electric wire abnormality detection system, 2 ... Steel tower, 3 ... Electric wire, 4 ... Connection apparatus, 5 ... Connection part, 51 ... Connection terminal, 52 ... Arm, 53 ... Motor, 54 ... Guide part, 55 ... Terminal body, 56 ... Pinion, 57 ... rack, 58 ... arm body, 6 ... control unit, 61 ... signal transmission / reception unit, 62 ... motor drive unit, 63 ... energization unit, 64 ... resistance measurement unit, 65 ... detection unit, 7 ... power supply unit, 71 ... rechargeable battery, 72 ... charger, 73 ... solar panel, 8 ... device body, 81 ... guide part, 82 ... casing, OPGW ... optical fiber composite ground wire, GW ... lightning protection ground wire (aerial ground wire), OPC: optical fiber cable, CU: remote monitoring device, A: predetermined direction, B: opposite direction, R: closed circuit, G: ground

Claims (5)

An electric wire abnormality detection method for detecting an abnormality of an electric wire bridged between predetermined steel towers,
A closed circuit is formed by electrically connecting a steel tower and an electric wire, and the abnormality of the electric wire forming the closed circuit is detected from the result of measuring the current or resistance value of the closed circuit when a voltage is applied to the closed circuit. An electric wire abnormality detection method characterized by performing.   An electric wire forming a closed circuit based on a result of measuring a current or resistance value of the closed circuit when a voltage is applied to the closed circuit by forming an electric closed circuit by the steel tower and the electric wire bridged between the steel tower In order to detect an abnormality, a connection device comprising a connection portion for electrically connecting the steel tower and the electric wire.   The connection device according to claim 2, wherein the connection portion is configured to be capable of releasing the connection with the electric wire. A plurality of steel towers provided at a predetermined interval, an electric wire spanned between the steel towers, and the connection device according to claim 2 or 3 provided in the plurality of steel towers,
An electric wire that forms a closed circuit from a result of measuring a current or resistance value of the closed circuit when a voltage is applied to the closed circuit by electrically connecting the tower and the electric wire by the connection device An electric wire abnormality detection system configured to be capable of detecting an abnormality in a wire.   The electric wire abnormality detection system according to claim 4, wherein a power supply unit capable of applying a predetermined voltage to the electric wire is integrally provided in the connection device.

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