JP4980824B2 - High voltage power cable connection device and temperature monitoring method for high voltage power cable connection - Google Patents

Description

  The present invention directly measures the conductor temperature of the connection portion of the high-voltage power cable and can monitor the temperature externally based on the measured value, and the temperature monitoring method of the connection portion of the high-voltage power cable About.

  2. Description of the Related Art Conventionally, electric power equipment has been temperature-monitored using a temperature indicating label or a non-contact temperature measuring device in order to detect an abnormality of a connection portion as a general maintenance method.

  For example, the temperature monitoring device of Patent Literature 1 is attached to a bare charging portion that is a target to be monitored by a reflector. In this reflector, the reflection state of the reflected light with respect to the incident light is changed by the phenomenon of discoloration or deformation due to the temperature change of the bare charged portion. In addition, a photoelectric switch having a contact that projects light on the reflector and opens and closes by a change in reception of the reflected light is provided. Thereby, when the reflection state of the reflector changes due to the temperature change of the bare charging portion, the contact of the photoelectric switch is opened and closed, and an alarm is issued, whereby temperature monitoring is performed.

  Moreover, the temperature management apparatus of patent document 2 has adhered the temperature change color member to the temperature management member, and monitors this temperature change color member with a color sensor. When the temperature of the temperature management member reaches a predetermined value, the color sensor detects a set color indicated by the temperature change color changing member and sends a predetermined electric signal. Further, the color sensor includes a color camera head that captures the temperature change color member, and a controller that detects a set color of the temperature change color member captured by the color camera head and sends a predetermined electrical signal. Yes.

  Moreover, the temperature display apparatus of patent document 3 is an apparatus which detects the temperature near charging parts, such as an electric wire, and displays it on a liquid crystal element. That is, in order to use the electric field energy, a current collecting unit composed of two or one current collecting plate is disposed near the charging unit. This current collector is connected to a temperature display circuit for displaying the temperature detected by the temperature sensor on the liquid crystal element. The current collecting unit is set so that the power induced in the current collecting unit by the electric field near the charging unit during the hot line satisfies the power necessary for driving the temperature display circuit.

  Moreover, the thermal label of patent document 4 performs temperature management by informing the overheated state etc. of a generator, a motor, a heater, etc. with an odor. That is, in the heat-sensitive label, an odorant layer is provided on an absorbent base material layer such as Japanese paper or fine paper, and the odorant layer is covered with a heat-meltable composition layer and a gas-permeable film layer. The hot-melt composition layer effectively suppresses the odorant from evaporating in the odorant layer and stores it in an encapsulated state for a long time.

  By sticking such a heat-sensitive label to the device, when an overheating abnormality occurs in the device, the hot-melt composition layer is melted and a part thereof is absorbed by the absorbent base material layer. The odorant in the odorant layer is volatilized by passing through the molten heat-meltable composition layer and the gas permeable film layer, and stimulates the olfaction of a nearby person.

In the disconnector with temperature monitoring device of Patent Document 5, a light shielding plate is attached via a shape memory alloy having one end fixed to a contact portion of the disconnector. An optical fiber support is attached to the contact portion, and the ends of the pair of optical fiber cables are opposed to each other by the optical fiber support. It arrange | positions so that the said light-shielding plate may be interposed in this opposing part. Further, a temperature sensor is attached to the contact portion, and converts the temperature rise into an optical signal. When heat is generated due to deterioration or poor contact of the contact portion and the temperature changes, the shape memory alloy is deformed, so that the light shielding plate moves forward and backward in the opposite portion of the optical fiber cable. Accordingly, the temperature sensor generates an optical signal, and this optical signal is transmitted to an appropriate detection device via the optical fiber cable, thereby notifying an abnormality.
JP-A-2-190724 Japanese Patent Laid-Open No. 10-115560 Japanese Patent No. 2754943 Japanese Patent No. 3176731 Japanese Utility Model Publication No. 4-29468

  By the way, as for the conventional patent documents 1-patent documents 4, although a temperature indication label is effective for the connection part which a charging part (conductor connection part) exposes, for example, about the connection part where a charging part is concealed by a grounding layer etc. Cannot measure the conductor directly.

Also, those that transmit optical signals of the temperature sensor in the optical fiber cable as in Patent Document 5, and the terminal end there is charged exposed part in voltage application state, the connecting portion or the like of the overhead conductors can direct the unit is measured However, in the case of having a laminated structure such as a charging part, an insulating part, and a grounding part from the inside like a connecting part of a high-voltage power cable, in order to ensure the insulating performance of the connecting part, the optical fiber can be pulled out to the outside. Can not.

  As described above, since the conductor temperature cannot be measured directly for a connection part that is completely covered with a grounding layer, such as the connection part of a high-voltage power cable, the temperature of the external grounding layer surface of the high-voltage power cable cannot be measured. There was no other way than to implement and estimate the internal conductor temperature by its temperature.

  An object of the present invention is to provide a connection device for a high-voltage power cable that can directly measure the conductor temperature of the connection portion of the high-voltage power cable and can monitor the temperature externally based on the measured value.

  In order to solve the above-mentioned problem, the connection device of the high-voltage power cable of the present invention is a conductor connection tube that is fitted to the outer periphery of the high-voltage power cable with the conductors butted against each other and connects the conductors, A wireless temperature sensor that is in contact with the surface of the conductor connection tube to measure the temperature of the conductor via the conductor connection tube, and a part of the wireless temperature sensor and the conductor connection tube that form an insulating cylinder It is characterized by being provided inside the inner semiconductive layer.

Further, the high voltage power cable connection device according to the present invention is the above high voltage power cable connection device, wherein the sleeve cover is made of a semiconductive rubber or a semiconductive resin between the internal semiconductive layer and the conductor connecting tube. Is preferably provided.

In the high voltage power cable connection device according to the present invention, the internal semiconductive layer is preferably a semiconductive rubber or a semiconductive resin.

According to the temperature monitoring method of the connecting portion of the high voltage power cable of the present invention, the conductor connection tube is fitted to the outer periphery of the conductors of the high voltage power cable in contact with each other, and the conductors are connected to each other. A wireless temperature sensor is brought into contact with the surface, and the wireless temperature sensor and the conductor connecting pipe are incorporated in an internal semiconductive layer constituting an insulating cylinder,
The wireless temperature sensor measures the temperature of the conductor through the conductor connection pipe, converts the measured temperature measurement value into transmission data, and transmits the transmission data to the outside of the insulating cylinder. The temperature of the conductor of the high-voltage cable is monitored based on a temperature measurement value received from the reception device and converted from the received transmission data.

  As will be understood from the means for solving the problems as described above, according to the high voltage power cable connection device of the present invention, the conductors of the high voltage power cable are fitted and connected to the outer periphery in a state where the conductors are in contact with each other. Since the wireless temperature sensor is brought into contact with the surface of the conductor connection tube, and this wireless temperature sensor is housed in the inner semiconductive layer constituting the insulating cylinder having the same potential as the conductor connection tube, The entire sensor circuit of the wireless temperature sensor can be kept at the same potential as that of the conductor connecting tube and the conductor, and a failure or malfunction of the sensor circuit due to the line voltage can be prevented. Therefore, it is possible to directly measure the temperature of the connection part of the high-voltage power cable concealed by the ground layer, which was impossible in the past, with a wireless temperature sensor, and to transmit this temperature measurement value to the outside. Can communicate with. Moreover, since it is a wireless system, the insulation performance of the connection part of a high voltage power cable is not deteriorated.

  Further, according to the temperature monitoring method for the connecting portion of the high-voltage power cable of the present invention, the wireless temperature sensor is attached to the surface of the conductor connecting tube that is fitted and connected to the outer periphery of the conductor of the high-voltage power cable in contact with each other. Since this wireless temperature sensor is housed inside some of the internal semiconductive layers constituting the insulating cylinder, the above-mentioned direct measurement with the wireless temperature sensor is possible without causing circuit failure or malfunction. The measured temperature value of the conductor measured through the conductor connection pipe can be transmitted to the outside as transmission data. This transmitted data is received by an external receiving device and converted into a temperature measurement value. Based on this temperature measurement value, the temperature of the connection portion of the high-voltage power cable, which has been difficult in the past, is directly measured. Therefore, temperature management can be easily performed, and more accurate maintenance can be performed.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIG. 1, a connecting device 1 for a high-voltage power cable according to this embodiment has a butting portion 7 in a state in which the conductors 5 are butted against each other in order to connect the conductors 5 of the high-voltage power cable 3. The outer periphery of the so-called charging unit is fitted with a conductor connecting tube 9 (also referred to as “sleeve”), and the conductors 5 are connected and connected. A wireless temperature sensor 11 for measuring the temperature of the conductor 5 is disposed in contact with the surface of the conductor connection tube 9.

  In this embodiment, the wireless temperature sensor 11 is an active type RFID and uses a frequency band around 312 MHz. As another example of the wireless temperature sensor 11, a passive or semi-passive wireless temperature sensor 11 can be used.

  The conductor connecting tube 9 and the wireless temperature sensor 11 are configured such that the outer periphery thereof is covered with a sleeve cover 13 made of a conductive resin, and the wireless temperature sensor 11 is built in the sleeve cover 13. The sleeve cover 13 is a semiconductive rubber molded product, and is used to keep the inner semiconductive layer 17 of the insulating cylinder 15 described later at the same potential.

  Further, the outer periphery of the sleeve cover 13 is covered with an insulating cylinder 15, and the insulating cylinder 15 is integrally molded from the inside with a three-layer structure of an internal semiconductive layer 17, an insulating layer 19, and an external semiconductive layer 21. It is a rubber molded product. Further, spacers 23 for insulating and reinforcing the gap between the high voltage power cable 3 and the insulating cylinder 15 are mounted on the left and right sides of the sleeve cover 13 in FIG.

  The outer periphery of the insulating cylinder 15 and the outer periphery of the high-voltage power cable 3 on both the left and right sides of the abutting portion 7 are covered with a protective cover 25 made of, for example, three layers of rubber.

  As the conductive resin for the insulating cylinder 15 and the sleeve cover 13, a semiconductive rubber or a semiconductive resin can be used.

  A receiving device 27 is provided outside the high-voltage power cable 3 to receive communication of transmission data of temperature measurement values measured by the wireless temperature sensor 11 and to monitor the temperature.

  With the above configuration, since the wireless temperature sensor 11 is housed in the conductive resin of the sleeve cover 13 covered with the inner semiconductive layer 17 of the insulating cylinder 15, the entire sensor circuit of the wireless temperature sensor 11 is a conductor. 5 can be maintained at the same potential as that of the sensor circuit 5, and failure or malfunction of the sensor circuit due to the line voltage can be prevented. As a result, the temperature of the conductor connection tube 9 is directly measured by the wireless temperature sensor 11, so that the temperature of the conductor 5 is measured, and the measured temperature measurement value is converted into transmission data. Since the transmission data is transmitted to the outside of the high voltage power cable 3, the transmission data can be communicated with the external receiving device 27.

  Therefore, the temperature of the conductor 5 of the high-voltage power cable as the power equipment concealed by the ground layer, which has been impossible in the past, can be directly measured via the conductor connection tube 9, and can be easily monitored from the outside. In other words, it is possible to perform temperature management and perform more accurate maintenance. Moreover, since it is a wireless system, the insulation performance of the connection part 7 of a high voltage | pressure power cable is not reduced.

  The basic structure of the high-voltage power cable connection device 1 of this embodiment is that the wireless temperature sensor 11 is provided in the conductive resin layer of the insulating cylinder 15, that is, in the internal semiconductive layer 17 in this embodiment. By incorporating this sensor circuit, the entire sensor circuit is set to the same potential so that no abnormality such as a potential difference is given to the inside of the sensor circuit when the high-voltage power cable is charged.

  That is, in FIG. 1, the semiconductive sleeve cover 13 is described as an example of a member that incorporates the wireless temperature sensor 11, but basically the wireless temperature sensor 11 can be removed without the sleeve cover 13. It is sufficient that the temperature sensor 11 is disposed between the inner semiconductive layer 17 of the insulating cylinder 15 and the conductor connection tube 9 and the surface of the conductor connection tube 9 is in contact with the wireless temperature sensor 11. For example, the inner semiconductive layer 17 can be configured to have the shape of the sleeve cover 13 of FIG. 1 and directly incorporate the wireless temperature sensor 11 in contact with the surface of the conductor connection tube 9.

  In addition to the above-described embodiment, the high-voltage power cable connection device 1 is a connection portion at a connection location where the conductors of the high-voltage power cable such as a device direct connection portion and an indoor / outdoor termination connection portion are abutted and connected to each other. It can also be incorporated in rubber and plastic covers for use, and the application range can be expanded.

  The high-voltage power cable 3 used in this embodiment is used at a voltage of 33 kV or less, but can also be applied to the high-voltage power cable 3 that can be used at a voltage higher than that.

Incidentally, in a temperature monitoring method of the connection portion of the high voltage cables 3 above was subjected to a reception confirmation test of the temperature data in a voltage application state, 12.7kV (22 / √3kV) Division conductive during at ground, about 2m It was confirmed that communication was possible at a distance of (meters). That is, the wireless communication distance was about 2 m (meters).

It is a schematic explanatory drawing including the principal part cross section which shows the connection apparatus of the high voltage | pressure power cable of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High voltage power cable connection apparatus 3 High voltage power cable 5 Conductor 7 Butting part 9 Conductor connection pipe 11 Wireless temperature sensor 13 Sleeve cover 15 Insulating cylinder 17 Internal semiconductive layer 19 Insulating layer 21 External semiconductive layer 23 Spacer 25 Protective cover 27 Receiver

Claims (4)

  A conductor connection tube that is fitted to the outer periphery of the high-voltage power cable with the conductors abutted to each other and connects the conductors, and the surface of the conductor connection tube to measure the temperature of the conductor via the conductor connection tube A high-temperature power cable comprising: a wireless temperature sensor that is in contact with the wireless temperature sensor; and the wireless temperature sensor and the conductor connecting pipe provided inside a part of the internal semiconductive layer constituting the insulating cylinder. Connected device. The high voltage power cable connection device according to claim 1, wherein a sleeve cover made of semiconductive rubber or semiconductive resin is provided between the inner semiconductive layer and the conductor connecting pipe. The high voltage power cable connection device according to claim 1, wherein the internal semiconductive layer is a semiconductive rubber or a semiconductive resin. In a state where the conductors of the high-voltage power cable are abutted against each other, a conductor connecting tube is fitted to the outer periphery of the cable to connect the conductors, a wireless temperature sensor is brought into contact with the surface of the conductor connecting tube, and an insulating cylinder is provided. Built-in the wireless temperature sensor and the conductor connection tube in the internal semiconductive layer that comprises,
The wireless temperature sensor measures the temperature of the conductor through the conductor connection pipe, converts the measured temperature measurement value into transmission data, and transmits the transmission data to the outside of the insulating cylinder. A temperature monitoring method for a connecting portion of a high-voltage power cable, characterized in that the temperature of the conductor of the high-voltage cable is monitored based on a temperature measurement value received from the reception device and converted from the received transmission data.

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