JPH01222613A - Supervision of protective device of anti-corrosion layor on single core cable line - Google Patents

Abstract

PURPOSE:To carry out continuous supervision, by detecting the current generated in a protective device of an anti-corrosion layor at the insulated junction box where single line of the three phase alternating current is connected, and the current generated in the cross bonding wires and metal sheath, and by supplying these detected current to a control center. CONSTITUTION:Three of single core cable 1a-1c are connected through the insulated junction boxes 10a-10c. On the insulated boxes 10a-10c, the left and the right cable sheathes 13a-13c of the insulators 11a-11c are connected and the protective devices of the anti-corrosion layor 7a-7c are constructed. The ampere meters 20a-20c detect the current on these points. Cross bonding wires 5a-5c are cross-connected through the ampere meter 22a-22c from the cable sheath 13a of phase (a) to phase (b), (c) and phase (a) in order. The current of the sheathes 13a-13c are detected by the ampere meter 21a-21c. The detected value by each meter 20a-22c are applied to the detected data processing unit 30. By this reason, continuous supervision are carried out without power down.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention provides a cable sheath (metal sheath) and an anti-corrosion layer in a cross-bond connection section in a single-core cable line, such as a single-core OF cable line or a single-core CV Kegur line. Regarding a device N that detects abnormal current flowing through a protective device and easily detects the history of dielectric breakdown of the anti-corrosion layer protective device caused by the abnormal current, Section 14 describes Overall abnormal current generation (
1 condition can easily be centrally controlled in a location separated from the anti-corrosion protection device.
) Regarding monitoring methods for corrosion protection layer protection devices! I-ru. (Prior art) Conventionally, an N1-core cable line is laid, and as shown in FIG. are arranged in parallel, and the sheaths of each phase are connected. At the box part, connect the metal sheath or metal shield (hereinafter abbreviated as couple sheath) of each insulating junction box to the cross bond connecting wires 5a' to 5C connected to both sides of the insulator. :
In this state, the phase 18 is connected to the phase 17, and means is used to cancel the abnormal currents flowing through the couple sheath. In addition, in the conventional example shown in FIG. 6 above, each sheath current suppressing device fJ
6a to 6C as well as anti-corrosion layer protection devices (arresters) 7a to 7C between each single wire cable and the ground, +? Even when +j normal current flows 1.1, the sheath current suppressing device and the anti-corrosion layer protection device prevent destruction of the anti-corrosion layer due to abnormal voltage generated in the anti-corrosion layer. . In other words, in conventional corrosion protection layer protection devices, a semiconductor device (arrestor element) such as sintered zinc oxide or silicon carbide particles is used, and abnormal voltage is applied to the cable sheath. If a high voltage occurs, the high voltage can be discharged to other adjacent sheaths or to the ground so that they cancel each other out. (Problems to be solved by the invention) However, in the above-mentioned small-core cable, the abnormal voltage generated in the cable sheath causes dielectric breakdown, etc., and small holes etc. are formed in the anti-corrosion layer. When a cable is formed, water enters through that area and corrodes the cable sheath such as -7FULMI, which can cause problems such as foreign matter entering the cable itself and causing couple failure. be. In addition, during the use of single-core coupler lines, inconvenient conditions such as deterioration of the arrester element installed in the anti-corrosion layer protection device or moisture build-up may occur, causing the effect of the cross-bonding means to deteriorate. Problems such as not being able to fully utilize the power transmission lines may occur, and the safety of the power transmission lines may not be ensured. Therefore, it is necessary to periodically inspect the condition of the anti-corrosion layer protection device, but for this inspection, it is necessary to stop the power transmission and install a fully insulated junction box installed on the single-core cable line. , carried out the work of inspecting the anti-corrosion layer protection device. 5 - If it is very long, it will require human labor to check it.
There are many problems with snow that require a lot of time. On the other hand, a protection device for an electric cable sheath has been proposed as shown in Japanese Utility Model Publication No. 13231/1983. In this conventional example, the detection terminals for inspecting the corrosion protection layer protection device are arranged in a row, and the arrester element of the corrosion protection layer protection device is measured by measuring the insulation resistance between the detection terminals and the ground. The structure is designed to allow easy inspection. However, even when such a method is used, there are many problems in measuring the insulation resistance during power transmission when the 19-core cable line is a high voltage transmission line such as a 275kV transmission line. However, there are problems such as the fact that it is very difficult to carry out inspection work for each insulating connection box individually. (Object of the Invention) The present invention solves the above-mentioned drawbacks of conventionally used devices, and therefore, J3 is installed in the insulating junction box.
I-C: A means for detecting the abnormally high voltage flowing through the cable sheath is installed, and the detected value from the first stage of detection is subjected to a concentrated one-band observation at the control center. It is an object of the present invention to provide a method for monitoring a corrosion protection layer protection device on a single-core cable line, which facilitates inspection work. (Means for Solving Problems d3 J: and Effects) The present invention connects each of the 11-wire couples of positive-phase AC through an insulated junction box, and connects the sheath of the single-wire cable that covers the adjacent part at each connection part. In the precautionary cable line connected by the cross-bond connection method, the part of the anti-corrosion layer protection device installed in the insulated connection box, the middle part of the cross-bond connection wire, and the cable sheath. 4. A detection means for detecting the voltage is installed corresponding to the cross bond part of each single wire cable, and the voltage flowing through the three circuits is detected for each 11i wire group.
[1-Input to Lerenku's detection data processing device, configured to always perform 117+' iM+ j↓1,
Method C for monitoring the anti-corrosion layer protection device ffI in a3 for an L11-core couple line configured to remotely monitor abnormal voltage flowing through the cable sheath of the single-core cable line
be. In addition, in the method for monitoring a corrosion protection layer protection device in a single-core cable line according to the present invention, a means for transmitting a detection value from the detection means to a control center is provided. 2] It can be electrically connected to the control center, and in addition, in order to transmit detection data, an optical fiber cable is used, and photoelectric conversion equipment is installed at both ends of the optical fiber cable. J: In converting the output from the detection means into light.
It is affected by the induced current generated in the power transmission line.
It is also possible to enable signal transmission. By configuring J5 as described above, in the single-core cable line J5 of the present invention, it is possible to constantly monitor the voltage flowing through the cable sheath for the cross-bond section of each single-wire cable constituting the single-core cable line. iiJ becomes Noh. Then, in the device of the present invention, C constantly detects the electric current flowing through the three detection means and makes a comparison to determine whether the anti-corrosion layer protector is always f+=Vh IJ or not.
It is possible to easily determine whether the anti-corrosion layer protector is damaged or not, and if a problem occurs in the anti-corrosion layer protection device, it can be easily determined, and the countermeasure work can be carried out quickly. To do it: to do it. (Example) A method for monitoring a corrosion protection layer protection device in a precautionary cable line according to the present invention will be explained according to an illustrated example. In the embodiment shown in FIG.
Three single wire cables 18~ constituting the cable line, etc.)
In the connection section of 1C, the single wire cables on both sides are connected via insulated junction boxes 10a to 10c, respectively. 1° The insulated junction box 10 shown in FIG.
6.16a through the connecting sleeve 17, and connect the ends of the outer cable sheath (metallic sheath) 18.18a of the conductor 16 to the jacket connecting tube 12.12a, respectively. Connect by one step such as a lead connection. Middle part of the jacket connection pipe 12.12a

[This is insulation tube 11
The cable sheaths of the single-core cables on both sides of the connection section are also insulated by the insulating tube 1'1, and both sides of the cross bond section are well insulated. Further, in the insulating junction box 1o of the present invention, the insulating tube 11
Connecting terminals 13, 13, . 7 connections, etc., and 19 connections. In the case of this embodiment, the anti-corrosion layer protector 7 is removed using a pair of inner terminals ('J1'), so that the outer terminals are used sequentially with the subbont 1. 1'10 --- In the above-mentioned insulated junction box 10 of the present invention, a covering layer 1/la of vinyl resin coating fj or the like is applied around the jacket connecting pipe 12.12a, and a wrapping layer of insulating tape 14b or the like is applied. 8 layers 14 are formed by covering and maintaining the protective layer 1 with the attached C part.
The connecting terminal 13 is made to protrude from the terminal 4. A reinforcing insulator 15 is filled in the space formed between the jacket connecting tube and the connecting portion of the internal C1 conductor 16. In addition, the insulated junction box 10 shown in this embodiment is provided with a current it (hereinafter referred to as current i?1, which includes a current detection device consisting of a Faraday element, etc.) as indicated by the reference numeral 21. However, as will be described later, this current J1 is a means for detecting the current generated in the cable sheath, thereby making it possible to directly detect abnormal current flowing in the cable sheath. In the embodiment shown in FIG. 1, an insulating junction box like the one shown in FIG.
Each 1-wire cable of the core cable line 1 is provided at each connecting portion of 11-18 to IC. Each of the above-mentioned insulating junction boxes has the same structure, as explained based on -b in FIG. 7, connect the left couple sheath of the single wire cable 1a and the right cable sheath of the single wire cable 1b with the cross bond connecting wire 5a, and connect the right glue sheath of the single wire cable 1a and the single wire cable 1C.
Connect the cable sheath and glue on the left side of [1
The single bond connection method is applied to each single wire cable so that the two cables are connected to each other by c. Furthermore, in the device of the present invention, a current 20a is applied to the portion of the anti-corrosion layer protection device 7, a current rit 21a is provided to an intermediate portion of the cross-bonding connecting wire 5, and a current 21a is provided as a current measuring means of the cable sheath. A total of 22a are arranged respectively, and connection wiring is made from these current tears 20a, 2'la, 22a to the detected data processing device 30,
I'm doing it. The three currents for the insulated junction box as described above are installed for each of the three single-wire cables that make up the single-core cable line. A line is output in the direction t-1 to the detection data processing device 30 so that each detection signal can be output. In addition, in the embodiment shown in FIG. 2, as in the embodiment shown in FIG. An example is shown in which the anti-corrosion layer protector ff17a is placed at the part where the ground is taken from the middle of the connection wire for the cross bond.In this example, as described above, An anti-corrosion layer protection device 7a is disposed at a portion branching in the direction GJ from the middle of the connection line 5a to the ground, and a current i+ 208 is provided to the anti-corrosion layer protection device 7a, and this current i'l
' 20a, the detection data processing device 3
The output J- is made to move toward 0. Also, the current it
21a and the current it 22a are arranged in the same manner as in the embodiment shown in FIG. 1, so that respective detected values can be obtained. Furthermore, for the single-wire cables 1b and 1C, ammeters 20, 21 and 22 are arranged in the same way as for the single-wire cable 1a, and the detected information can be outputted to the detected data processing device. I will be able to do it. The detection information that is applied to the cross-bond section of the single-core cable line 1 configured as described above is transmitted to the detection data processing device as shown in FIG. Although in the embodiment shown in the figure, the sensing signal from each current meter can be transmitted directly as an electrical signal toward the sensing data processing device 30, in this embodiment, each ammeter The detection signals from the insulating junction box 10a are transmitted to the detection data processing device 30 using optical fiber cables 35a to 35c. rt
The signal 8 from 20 a, 21 El, and 22 a is output from the signal line provided corresponding to each ammeter, but in the middle of the signal transmission, it is converted into light fl 'l"j and becomes -C1 light. The optical fiber cables 35a-35C are used to transmit data to the controller 1-roll center.In other words, in this embodiment, photoelectric converters Mi, 31.3.2 are installed at both ends of each optical fiber cable. The output of each current η1 is converted into an optical signal by the photoelectric conversion device 31, and then connected to -C via an optical fiber cable.
The signal is transmitted to the control center, and in the control center 1 to the roll center, the photoelectric conversion device 32 converts the optical signal into an electrical signal and inputs it to the detection data processing device 30. Such optical/electrical signal conversion means is provided for each insulated junction box in each cross bond section, and in the control center, signals from all -C insulated junction boxes provided in the single-core cable line 1 are Regarding centralized processing, it is necessary to be able to detect the occurrence of abnormal voltage in each cross-bond section of each single-wire cable.3
゜In addition, in the apparatus of the present invention, the above lj, J:
Although it is also possible to arrange an optical fiber cable 37 corresponding to each current 51, as shown in FIG. It is also possible to do so. In this case, as described above, three currents S1 are arranged for one insulating junction box, so the output circuits of each ammeter are combined into one photoelectric multiplexer 36. place,
The photoelectric multiplex conversion device 36 is configured to perform photoelectric signal conversion. Furthermore, the optical signal transmitted by one optical fiber cable 37 as described above is converted into an electrical signal by a photoelectric multiplexing device 38 at the end of the optical fiber cable 37, and is input to the detection data processing device 30. , and performs the operation of processing the signal. Therefore, when configured as described above, one optical fiber cable 37 is provided for each insulated junction box.
Since only books are arranged, it is possible to use fewer b(U-bow lines) than in the case of FIG. 4. In the embodiment shown in FIG. However, in the case of the device shown in FIG. 2 above, a transmission circuit as shown in FIG. 5 is provided. In the example shown in (), there are three currents R1' 20 Fl
, 21a, 22aJ: For the IC Shinkyu line that is pulled out,
Similar to that shown in FIG. 4 - C1 photoelectric conversion device 3
1a, 31b, and 31G are installed respectively, and the information from the electric signal signal detected by the electric current 81 is converted into an optical signal, and the upstream control center can be connected to each corresponding optical fiber cable. Moreover, in this embodiment, in order to reduce the number of optical fiber cables, as shown in FIG. 4a,
It goes without saying that it is also possible to transmit the optical multiplexed signal using a single optical fiber cable. In addition, in the embodiment of the present invention, the function of the photoelectric multiplexing device as shown in FIG. It is also possible to configure the information so that it can be transmitted by a fiber cable. Furthermore, in the device of the present invention, one C
The current if2''+a~21G to be placed can be a normal ammeter, as long as it can detect the current flowing through the cable sheath, or a general current measuring means that has been used in the past. It is something that can be used,
Conventionally known devices can be used as the photoelectric conversion device and the photoelectric multiplexing device. As described above, the abnormal voltage detected at each insulating junction box is input to the detection data processing device 30 installed in the roll center of the enclosure 1, where the signal is processed, compared with the normal voltage, etc. If an abnormal condition is detected in the anti-corrosion protective equipment after the above operation is performed, the abnormality may be disconnected or the [1 bond section and other information] -1r)- -It will be displayed on the display section of the center, and you can take corrective action immediately. . In addition, when the circuit of the single-core cable line 1 is laid, the distance of the section, the abnormal electric current Ji (ir +, and each other L1
Necessary data needs to be determined for each bond interval, and in the input terminal, an abnormal voltage is detected by comparing the initially set value and the detected value output from the current t1. Each single line coupler glue of L1's 4-hide is connected to the point where data can be output to the f exit of the 1 spondo section. Also, if abnormal voltage flows through the cable sheath,
Even if the corrosion protection layer protection device is damaged by the abnormal voltage or the corrosion protection layer is not destroyed, information about the abnormal voltage flowing through each single-core cable line or
Since each jJ
When J/+li Yi tongue, ■) Good layer appeal device?゛1
It will be possible to reliably carry out F+ work such as maintenance and other +:A inspections. (Effects of the Invention) The method for monitoring the anti-corrosion layer protection device applied to a single-core cable line according to the present invention has the configuration as described above, so that power transmission through the single-core cable line cannot be interrupted. Without,
It is possible to constantly monitor the state of the anti-corrosion layer protection device, and it is possible to easily identify the section in the event of an accident, resulting in a total of 11 times. In addition, the installation R1 of the present invention has a single-core coupler line laid over a long section, especially in the right row when the C stage (J) is used, making it easy to centralize management at the control rental company. At the same time, the history of abnormal voltages flowing through each anti-corrosion layer protection device can be stored as data, making it easier to maintain the high-voltage power transmission circuit after it has been installed. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a monitoring device for a corrosion protection layer protection device of the present invention, FIG. 2 is an explanatory diagram showing the configuration of another embodiment of the present invention, and FIG. A sectional view showing the configuration, FIG. 4 is a circuit diagram showing the configuration of the signal transmission circuit of the present invention,
Fig. 4a is an explanatory diagram of another embodiment showing the arrangement state of the optical noir and fiber cables, Fig. 5 is an explanatory diagram of a signal transmission circuit corresponding to Fig. 2, and Fig. 6 is an explanatory diagram of a conventional example FIG. 1 is an explanatory diagram of the 1-sbond connection method. Reference numerals in the figure: 1...Single-core cable line, 5...Connection wire for cross bond, 6...Sheath current suppressor, 7...Corrosion protection layer Protective device (arrestor), 10
...Insulation junction box, 11 ...Insulation cylinder, 1
2... Conductor portion, 13... Cable sheath, 14... Anti-corrosion layer, 20, 21, 22...
...Rainyu Tears, 30...Detection Data Processing Device, 31, 32...Photoelectric Conversion Device 135, 37...
...Optical fiber cable, 36, 38...
...Photoelectric multiplex conversion device.

Claims (3)

[Claims] (1) In a single-core cable line in which each three-phase AC single wire is connected via an insulated junction box, and the sheaths of adjacent single wires are connected at each connection part by a cross-bond connection method, the insulated junction box is Detection means for detecting the current generated in the provided anti-corrosion layer protection device, the intermediate portion of the cross-bond connection wire, and the metal sheath are provided for each single wire cable, and the three circuits are By inputting the current flowing through each single-wire cable into the detection data processing device of the control center and comparing the output values of each detection means, the operating state of the anti-corrosion layer protection device can be constantly monitored. A method for monitoring a corrosion protection layer protection device in a single-core cable line. (2) The detection means is provided in each insulated junction box of the single-core cable line, and means is provided for transmitting the detected values from the detection means to a control center that performs centralized management, and the detection means and the control center are Claim 1 characterized in that they are connected by a normal power transmission line.
A method for monitoring an anti-corrosion layer protection device in a single-core cable line as described in . (3) An optical fiber cable is used as the detection data transmission means, and a photoelectric conversion device is provided at both ends of the optical fiber cable.
A method for monitoring a corrosion protection layer protection device in a single-core cable line according to item 1 or 2.