JP2007174726A - Gas insulated power device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the workability for an inspection, a maintenance and a replacement, facilitate understanding of a situation within a grounded container, a replacement of an arrester element, a calibration of various measuring instruments, an installation, an inspection and a replacement of sensors for understanding the situation within the grounded container, and also improve the detection accuracy. <P>SOLUTION: In a gas insulated power device, a conductor 2 is accommodated as an insulative gas is sealed within the grounded container 1, and supported by an insulation spacer 3 in a state that the conductor 2 is floated from the grounded container 1. The gas insulated power device is provided with a partition space 5 disposed within the insulation spacer 3, air-tightly partitioned from a space 4 within the grounded container 1 and extending from a face 3a on the grounded container 1 side to the conductor 2 or a member (a conductive sleeve) 3b electrically connected to the conductor 2, a hole 6 disposed in a region for facing the partition space 5 of the grounded container 1, and an occlusion member 7 for openably occluding the hole 6. The arrester element is accommodated in the partition space 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to gas-insulated power equipment such as a gas-insulated switchgear (GIS) and a gas-insulated transmission line (GIL). More specifically, the present invention relates to an improvement of an insulating spacer for fixing a central conductor used in gas insulated electrode equipment.

  Gas-insulated power equipment such as GIS used in substations, GIL for power transmission, etc., is equipped with a lightning arrester that discharges lightning that enters from the outside, internal accidents, or abnormal voltages that occur during circuit switching to the ground. Yes. Conventionally, there is known a GIS in which a lightning protection element is embedded in an insulating spacer that supports a conductor accommodated in a ground tank (Japanese Patent Laid-Open No. 2001-145218). By embedding the lightning arrester in the insulating spacer, it is not necessary to provide a lightning arrester separately, a dedicated space for installing the lightning arrester can be eliminated, and the GIS can be miniaturized.

  Further, in the gas insulated power device, for example, measuring devices (hereinafter referred to as various measuring devices) such as an instrument transformer (PT (VT)) and an instrument current transformer (CT) are installed. In order to improve the measurement reliability of various measuring instruments, it is desirable to perform calibration using a power source for calibration.

  Furthermore, since the surroundings of the gas-insulated power device are covered with a grounding container such as a grounding tank or a grounding sheath, it is difficult to directly detect an abnormality such as a partial discharge occurring inside. For this reason, detection means such as partial discharge have been studied. For example, as an electrical detection method for partial discharge, an external antenna system that detects the potential difference generated in the tank flange insulation due to partial discharge with a resonance circuit / differential amplifier is used. The vibration detection method that detects the mechanical vibration of the tank generated by an acceleration sensor (AE sensor) is a chemical detection method, such as a gas checker method that detects a small amount of decomposed gas generated by partial discharge by the color change of the detection substance. It has been studied (Non-Patent Document 1).

JP 2001-145218 A “Joint Electric Research”, Volume 52, No. 1, pp 106-108, 2003

  However, the GIS in which a lightning protection element is embedded in the insulating spacer described above has the following problems. Since the lightning arrester deteriorates by repeating the operation due to the invasion of overvoltage (current flows through the lightning arrester), it is necessary to replace it at an appropriate timing. If the lightning protection element is embedded in the insulation spacer, the insulation gas enclosed in the ground tank is extracted and the inside of the ground tank is opened to the outside. Then, the insulation spacer supporting the conductor is removed and disassembled, and the lightning protection It is necessary to replace the element. After the replacement, the insulating spacer is attached as it is to support the conductor, and the inside of the grounding tank is hermetically sealed to fill the insulating gas. At this time, if foreign matter such as dust enters the ground tank, it may cause partial discharge, that is, dielectric breakdown. Therefore, it is necessary to ensure high cleanliness in the ground tank. Thus, the work of opening the inside of the ground tank to the outside is a very large work. Moreover, since GIS is installed outdoors, the inside of the ground tank is opened to the outside outdoors, and it is difficult to ensure the cleanliness in the ground tank after replacement. These problems are also a problem with gas insulated power equipment other than GIS.

  Conventionally, it has been difficult to calibrate various measuring instruments provided in gas-insulated power equipment. For example, in calibration of a measuring instrument such as CT / PT (VT) provided in the GIS, it is necessary to apply a calibration current / voltage. At this time, it is necessary to disconnect the GIS from the system. This is because when GIS is connected to the system, (1) even if a voltage is applied, the capacitance of the line is charged and a voltage drop occurs, resulting in the generation of the necessary calibration voltage. (2) If the capacity of the calibration power supply is increased, it is not preferable that a voltage be applied to the entire system. Therefore, it is necessary to open the disconnectors on the input side and output side of the GIS and disconnect the GIS from the system. However, when the circuit breakers on the input side and the output side are opened, it is difficult to apply a calibration voltage from the outside to the inside of the GIS that is covered with a ground container such as a ground tank or a ground sheath. For this reason, in the end, it is actually difficult to calibrate various measuring instruments provided in the GIS. Such a problem also applies to gas-insulated power equipment other than GIS.

  Furthermore, the above-described detection method for partial discharge has the following problems. In other words, in any detection method, sensors are arranged in the grounding container or sensors are arranged outside the grounding container, so that the inspection and maintenance of the sensors and the detection sensitivity are improved. It was not possible to achieve both. In other words, the detection method in which sensors are installed in the grounding container has excellent detection sensitivity, but if the grounding container in which the insulating gas is sealed is not opened to the outside, the sensors are inspected, maintained, or replaced. Can not do it. On the other hand, in the detection method in which the sensors are installed outside the grounded container, the inspection and maintenance / replacement of the sensors is easy, but the detection sensitivity is inferior to that in the case where the sensors are installed inside.

  As described above, in the conventional gas-insulated power equipment, the workability of inspection / maintenance / replacement is poor due to the surrounding area being covered with the ground container, and it is difficult to grasp the situation inside the ground container.

  An object of the present invention is to provide a gas-insulated power device that is excellent in workability for inspection / maintenance / replacement and that allows easy understanding of the situation inside a grounded container. More specifically, an object of the present invention is to provide a gas insulated power device in which a lightning protection element can be easily replaced. Another object of the present invention is to provide a gas-insulated power device capable of calibrating various measuring devices. Furthermore, an object of the present invention is to provide a gas-insulated power device that is easy to install, inspect, maintain, and replace sensors for grasping the situation in the grounded container and has excellent detection sensitivity.

  In order to achieve this object, the invention according to claim 1 is a gas-insulated power device in which an insulating gas is enclosed in a ground container and a conductor is accommodated, and the conductor is supported in a state of being floated from the ground container by an insulating spacer. A partition space provided in the insulating spacer and hermetically partitioned from the space in the ground container and reaching the conductor or a member electrically connected to the conductor from the surface on the ground container side, and a portion facing the partition space of the ground container And a closing member for closing the hole so as to be openable.

  Therefore, when the closing member is removed, the partition space is opened to the outside of the ground container. Since the partition space is partitioned from the space filled with the insulating gas in the ground container, the space in the ground container is not opened to the outside even if the partition space is opened to the outside. On the other hand, when the removed closing member is attached, the hole of the ground container is closed and the partition space is sealed to become a space independent from the outside.

  According to a second aspect of the present invention, there is provided a gas-insulated power device in which a room leading to the hole is provided inside the closing member and the partition space is extended outside the ground container. Therefore, the partition space is widened.

  According to a third aspect of the present invention, there is provided a gas insulated power device in which an insulating gas is sealed in a partition space. Therefore, the insulation resistance performance of the partition space is improved.

  According to a fourth aspect of the present invention, there is provided a gas insulated power device in which a lightning protection element is accommodated in a partition space. Therefore, the insulating spacer can function as a lightning arrester. Moreover, by opening and closing the closing member, it is possible to replace the lightning arrester without opening the ground container.

  According to a fifth aspect of the present invention, there is provided a gas-insulated power device comprising a detecting means for detecting an operation state of the lightning protection element. Therefore, when the lightning arrester operates due to the intrusion or occurrence of overvoltage, this operation is detected by the detecting means. For this reason, the operation state of the lightning arrester can be grasped, and the deterioration of the lightning arrester can be detected based on the grasped operation state. As the grasping operation state, for example, the amount of current passing through the lightning arrester, the value of current passing through the lightning arrester, the temperature of the lightning arrester, and the like can be considered.

  According to a sixth aspect of the present invention, there is provided a gas insulated power device in which a calibration power source for applying a calibration voltage to a conductor or supplying a calibration current is accommodated in a partition space. Therefore, it is possible to apply a calibration voltage or supply a calibration current to the conductor.

  Furthermore, a gas insulated power device according to a seventh aspect of the present invention includes a state monitoring sensor for monitoring a state in the grounded container accommodated in the partition space. Therefore, the state in the ground container can be monitored.

  2. The gas insulated power device according to claim 1, wherein the partition space is provided in the insulating spacer and is hermetically partitioned from the space in the ground container and reaches the conductor or a member electrically connected to the conductor from the surface on the ground container side. And a hole provided in a portion facing the partition space of the ground container and a closing member that closes the hole so that the hole can be opened. Therefore, only the partition space can be opened by removing the blocking member. For this reason, partition space can be used as space which can be utilized from the outside, without opening the inside of a grounding container. For example, the partition space can be used as a space where equipment for a predetermined purpose is installed. In this case, while keeping the airtightness without removing the insulating gas sealed in the ground container, Equipment for a predetermined purpose can be installed or removed from the ground container. Moreover, since the partition space is formed in the insulating spacer, the partition space can be provided by using the existing insulating spacer, which is very rational and economical, and the size of the gas insulated power device is increased. Can be prevented.

  Further, in the gas insulated power device according to claim 2, since the room leading to the hole is provided inside the closing member and the partition space is expanded to the outside of the grounding container, the partition space becomes wide and does not fit in the insulating spacer. This makes it possible to install devices for a predetermined purpose. For this reason, the usability of the partition space is improved.

  Moreover, in the gas insulated power equipment of Claim 3, since the insulating gas was enclosed in the partition space, the insulation resistance performance of the partition space can be improved.

  Moreover, in the gas insulated power equipment of Claim 4, since the lightning arrester was accommodated in the partition space, an insulating spacer can be functioned as a lightning arrester. For this reason, it is not necessary to provide a separate lightning arrester, the manufacturing cost can be reduced, and the gas-insulated power device can be downsized. In addition, since the lightning protection element can be replaced without opening the interior of the installation container by opening and closing the closure member (removal from the ground container, attachment to the installation container), the lightning protection element can be easily replaced. Furthermore, since the lightning arrester can be installed in the ground container, not only lightning surge from the system but also disconnector surge generated inside the gas insulated power device can be effectively suppressed.

  Further, the gas-insulated power device according to claim 5 includes detection means for detecting the operation status of the lightning arrester, so that the deterioration of the lightning arrester can be detected based on the operation status of the lightning arrester, and at an appropriate timing. It is possible to replace the lightning protection element.

  In the gas insulated power device according to claim 6, since the calibration power source for applying the calibration voltage to the conductor or supplying the calibration current is accommodated in the partition space, the calibration voltage is applied to the conductor or the calibration current is supplied. Can be supplied. For this reason, it is possible to apply a calibration voltage or supply a calibration current to the conductor in a state where the gas-insulated power device is easily disconnected from the system by a disconnector or the like, for example, an instrument transformer PT (VT), It becomes possible to calibrate various measuring devices such as the current transformer CT.

  Furthermore, in the gas insulated power equipment according to the seventh aspect, since the state monitoring sensor for monitoring the state in the ground container is accommodated in the partition space, the state in the ground container can be monitored.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings. In addition, as a gas insulated power apparatus, GIS is demonstrated as an example, for example. However, the present invention is not limited to GIS, and can be applied to gas insulated power equipment such as GIL.

  FIG. 1 shows a first embodiment of a gas insulated power device to which the present invention is applied. The gas-insulated power device is configured to enclose an insulating gas in the ground container 1 and accommodate the conductor 2, and to support the conductor 2 in a state of being floated from the ground container 1 by the insulating spacer 3. A partition space 5 that is airtightly partitioned from the space 4 in the grounded container 1 and reaches the member 3b that is electrically connected to the conductor 2 from the surface 3a on the grounded container 1 side; and the partition space 5 of the grounded container 1 There are provided a hole 6 provided in an opposing part and a closing member 7 for closing the hole 6 so as to be openable. In this embodiment, the lightning protection element 8 is accommodated in the partition space 5.

The ground container 1 is, for example, a GIS ground tank, and, for example, SF ₆ gas is sealed therein as an insulating gas.

  The insulating spacer 3 is, for example, a post-type insulating spacer, and includes a conductive sleeve 3b that surrounds the conductor 2, and a support portion 3c that supports the conductive sleeve 3b. The conductive sleeve 3b is formed of a metal such as aluminum, for example. By inserting, for example, the ends of the two conductors 2 into the conductive sleeve 3b, the two conductors 2 can be supported while being floated with respect to the ground container 1 while being electrically connected. .

  The conductive sleeve 3b is provided with a shield electrode 3e for electric field relaxation. In the present embodiment, the shield electrode 3e is formed integrally with the conductive sleeve 3b. However, the shield electrode 3e created separately may be fixed to the conductive sleeve 3b by means such as welding. The shield electrode 3 e is provided in an annular shape so as to surround the lightning protection element 8. By providing the shield electrode 3e, the electric field concentration in the portion of the partition space 5 in the insulating spacer 3 that contacts the conductive sleeve 3b can be reduced. Further, by providing the shield electrode 3e, the electric field concentration at the portion where the lightning protection element 8 is in contact with the conductive sleeve 3b can be reduced. That is, if there is something in contact with the conductive sleeve 3b, the electric field concentrates at the contact point, and the electric field concentration can be mitigated by providing the shield electrode 3e. However, the shield electrode 3e may be omitted.

  The support portion 3c is formed of, for example, an insulating resin, and a partition space 5 reaching the member electrically connected to the conductor 2, that is, the conductive sleeve 3b, from the surface 3a on the ground container 1 side is formed inside. Yes. However, the partition space 5 may directly reach the conductor 2 from the surface 3a on the grounding container 1 side, that is, a hole is formed in the conductive sleeve 3b so that the partition space 5 extends from the surface 3a on the grounding container 1 side to the conductor 2. It is also good to reach In the partition space 5, for example, the same insulating gas as the insulating gas sealed in the ground container 1 is sealed. However, an insulating gas different from the insulating gas sealed in the ground container 1 may be sealed in the partition space 5.

  The insulating spacer mounting position of the ground container 1 has a double plate structure. The grounding container 1 side end 3d of the insulating spacer 3 is inserted into the stepped portion of the double plate structure. The space between the ground container 1 and the insulating spacer 3 is hermetically sealed. In addition, a hole 6 that faces the partition space 5 is formed in the outer plate 9 of the double plate structure of the ground container 1.

  A closing member 7 is detachably attached to the outer plate 9. The closing member 7 is a flange with a gas port, for example. After the closing member 7 is closed, an insulating gas can be filled into the partition space 5 from a gas boat (not shown).

  The lightning protection element 8 is, for example, a zinc oxide element. In the partition space 5, a plurality of lightning protection elements 8 are accommodated in a line. The row of lightning protection elements 8 is pressed against the conductive sleeve 3 b by a spring 10. By accommodating the lightning arrester 8 in the partition space 5, a lightning arrester is configured using the insulating spacer 3.

  In a state in which the closing member 7 is closed, the hole 6 of the ground container 1 is hermetically closed and the partition space 5 becomes an independent space. Since the partition space 5 is filled with an insulating gas, the partition space 5 is well insulated.

  When an abnormal voltage enters or occurs in the conductor 2, a current flows through the lightning protection element 8, and the abnormal voltage is discharged to the ground. That is, the lightning arrester using the insulating spacer 3 operates. Since the lightning protection element 8 deteriorates due to the operation of the lightning arrester, it is necessary to replace the lightning protection element 8. When the blocking member 7 is removed from the ground container 1, the partition space 5 is opened to the outside, so that the lightning protection element 8 can be easily replaced.

  At this time, even if the closing member 7 is removed, the space 4 in the grounded container 1 is not opened to the outside, so that the replacement work is simple. That is, when the space 4 in the ground container 1 is opened to the outside, it is necessary to extract and collect the insulating gas before opening, and the ground container 1 is sealed after the lightning protection element 8 is replaced. At this time, it is necessary to ensure the cleanliness of the space 4 in the grounded container 1 and refill the insulating gas. As described above, the work for opening the space 4 in the grounding container 1 is very large, and since the GIS is not installed in a clean room, the cleanliness of the space 4 in the grounding container 1 is ensured. It is very difficult to do.

  On the other hand, in the present invention, the space 4 in the grounding container 1 is not opened, but only the partition space 5 is opened. Therefore, the open space can be limited to be extremely narrow, and the replacement work is extremely easy. . Moreover, since the open space can be limited to a very narrow space, it is easy to ensure its cleanliness. Furthermore, the lightning protection element 8 can be directly replaced by opening the closing member 7, and the replacement work is facilitated from this point. In addition, when opening the inside of the partition space 5, it is preferable to collect | recover the insulating gas enclosed in the partition space 5. FIG.

  Moreover, since the partition space 5 is provided by using the insulating spacer 3 which is an existing part, it is very rational and economical, and an increase in size of the gas insulated power device can be prevented.

  In addition, since the lightning arrester function can be provided inside the gas-insulated power equipment, it is possible to escape abnormal voltages such as lightning surges that enter the system, as well as to occur inside the gas-insulated power equipment. An abnormal voltage such as a disconnector surge can also be released.

  Furthermore, since the insulating gas is enclosed in the partition space 5, the insulation resistance performance of the partition space 5 can be improved.

  Next, a second embodiment of the gas insulated power device of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as the gas insulated power equipment shown in FIG. 1, and those detailed description is abbreviate | omitted.

  In this gas-insulated power apparatus, for example, as shown in FIG. 2, a room 11 leading to the hole 6 is provided inside the closing member 7 to extend the partition space 5 to the outside of the ground container 1. A calibration power source 12 that applies a calibration voltage to the conductor 2 is accommodated in the partition space 5. The calibration power source 12 is connected to the conductive sleeve 3 b of the insulating spacer 3 by a tangent line 16. Therefore, the calibration voltage can be applied to the conductor 2 through the conductive sleeve 3b.

  FIG. 3 shows the concept of calibration using the calibration power supply 12. The calibration is performed by opening the voltage measuring device 13 which is various measuring devices to be calibrated and the disconnector or circuit breaker (hereinafter referred to as a switch 14) located upstream and downstream of the calibration power source 12 and the voltage measuring device 13 and the calibration device. This is performed with the upstream and downstream of the power supply 12 disconnected from the system. In a state where a calibration voltage is applied to the conductor 2 by the calibration power source 12, the voltage measurement device 13 measures the voltage. Based on the measured value of the voltage measuring device 13 and the voltage value applied by the calibration power source 12, the voltage measuring device 13 is calibrated.

  By accommodating the calibration power source 12 in the partition space 5, the calibration power source 12 can be installed inside the gas-insulated power device. For this reason, it is possible to calibrate various measuring instruments of gas-insulated power equipment, which has been difficult in the past. In addition, since the calibration power supply 12 can be disposed near the voltage measuring device 13 to be calibrated, calibration can be performed with higher accuracy.

  Instead of the calibration power source 12 that applies the calibration voltage to the conductor 2, a calibration power source 12 that supplies a calibration current to the conductor 2 may be accommodated in the partition space 5. The concept of calibration in this case is shown in FIG. In the calibration using the calibration current, the current measuring device 15 which is various measuring devices to be calibrated is generally a current transformer (CT), and therefore a current transformer will be described as an example. Now, among the upstream and downstream switches 14 sandwiching the calibration power supply 12 and the current transformer 15, the upstream switch 14 is opened, and the downstream switch 14 is closed. The downstream side of the downstream switch 14 is grounded outside the GIS, for example, at the bushing portion. Calibration is performed in this state. The current supplied by the calibration power supply 12 flows from the calibration power supply 12 → the connection line 16 → the conductive sleeve 3 b → the conductor 2 and is grounded. The magnetic field generated at this time is measured by the current transformer 15 to obtain a current value. The current transformer 15 is calibrated by comparing the measured current value with the current value supplied by the calibration power supply 12. Also in this case, it becomes possible to calibrate various measuring instruments of the gas insulated power equipment, which has been difficult in the past. Moreover, since the calibration power supply 12 can be disposed near the current transformer 15 to be calibrated, calibration can be performed with higher accuracy.

  Also in the second embodiment, since only the partition space 5 can be opened without opening the ground container 1, the calibration power supply 12 can be easily installed, inspected, and replaced.

  Next, a third embodiment of the gas insulated power device of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as the gas insulated power equipment shown in FIG. 1, and those detailed description is abbreviate | omitted.

  In this gas insulated power device, for example, as shown in FIG. 5, the state monitoring sensor 17 is accommodated in the partition space 5. The state monitoring sensor 17 is an optical sensor that detects light emission accompanying partial discharge in the grounded container 1, for example. When partial discharge occurs in the grounded container 1, light emission occurs. By detecting this light emission by the optical sensor, it is possible to detect that partial discharge has occurred in the ground container 1.

  The state monitoring sensor 17 is not limited to an optical sensor. For example, an antenna that detects electromagnetic waves generated due to partial discharge, and an AE sensor that detects vibrations of the ground container 1 due to the movement of foreign matter that has entered the ground container 1. Also, an ultrasonic sensor that detects an ultrasonic wave that occurs with partial discharge, a sound sensor that detects a sound that occurs with partial discharge, various observation cameras, and the like may be used. Further, as an antenna, for example, use of a UHF antenna that detects an electromagnetic wave in the UHF band generated due to partial discharge can be considered. A plurality of state monitoring sensors 17 may be installed in the partition space 5. Further, the state monitoring sensor 17 may be a terahertz light generation device (observation device using terahertz light). Since the terahertz light passes through various plastics and resins, the terahertz light generating device in the partition space 5 can irradiate the GIS with the terahertz light and receive the reflected light so that the inside of the GIS can be seen through. Can monitor the situation.

  Also in the third embodiment, since only the partition space 5 can be opened without opening the inside of the ground container 1, the work of installing, inspecting and maintaining the state monitoring sensor 17 is easy. Further, since the state monitoring sensor 17 is disposed in the ground container 1, the detection sensitivity is good, and the S / N ratio (signal / noise ratio) can be improved. Further, by enabling accommodation in the partition space 5, it is possible to increase options for the installation location of the state monitoring sensor 17.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above description, the GIS is taken as an example, but the present invention is not limited to the GIS, and can be applied to a gas insulated power device such as a GIL. That is, any gas-insulated power device that accommodates the conductor 2 having a large potential difference from the grounded container 1 in the grounded container 1 and supports the conductor 2 by the insulating spacer 3 is applicable.

In the above description, the insulating gas is SF ₆ gas, but is not limited thereto.

  In the above description, the insulating spacer 3 is the post-type insulating spacer 3. However, the insulating spacer 3 is not limited to the post-type insulating spacer. For example, a disk-type insulating spacer, a cone-type insulating spacer, or the like may be used, and any leading edge spacer that can provide the partition space 5 inside is applicable.

  In the above description, the lightning protection element 8, the calibration power supply 12, and the state monitoring sensor 17 are accommodated in the partition space 5, but other parts and devices may be accommodated. That is, the partition space 5 may be used for purposes other than the purpose of installing the lightning protection element 8, the calibration power supply 12, and the state monitoring sensor 17. That is, the partition space 5 can be used for multiple purposes.

  In the above description, the insulating gas is sealed in the partition space 5, but the insulating gas may not be sealed in the partition space 5.

  Further, for a gas insulated power device (for example, the gas insulated power device of FIGS. 1 and 6) that does not extend the partition space 5 to the outside of the grounded container 1, a room 11 is provided inside the closing member 7 to define the partition space 5. On the contrary, the gas insulated power equipment (for example, the gas insulated power equipment shown in FIGS. 2 and 5) in which the partition space 5 is extended to the outside of the ground container 1 is expanded by omitting the room 11. A partition space 5 that is not provided may be used.

  Further, when the lightning protection element 8 is provided in the partition space 5 as in the gas-insulated power device of FIG. 1, a detection means 18 for detecting the operation state of the lightning protection element 8 may be provided. An example of this case is shown in FIG. In the present embodiment, for example, two detection means such as a current transformer (CT) 18A for detecting the amount of current passing through the lightning protection element 8 and a thermocouple probe 18B for detecting the temperature of the lightning protection element 8 are used as the detection means 18. have. The instrument current transformer 18 </ b> A is disposed, for example, around the spring 10. The thermocouple probe 18B is attached to the lightning protection element 8 on the spring 10 side, for example. When the lightning arrester operates and a current flows from the conductor 2 → the conductive sleeve 3b → the lightning protection element 8 → the spring 10 → the closing member 7 → the ground container 1, the current flows to the secondary side of the current transformer 18A due to the change of the magnetic field lines. Flows. The amount of current flowing to the secondary side of the instrument current transformer 18A is proportional to the amount of current flowing through the operation of the lightning arrester (primary side current amount). By measuring the amount of current flowing to the secondary side of the current transformer 18 </ b> A by the current measuring device 19, the amount of current flowing to the lightning protection element 8 can be measured. Further, when the lightning arrester is activated and a current flows as described above, the temperature of the lightning protection element 8 rises. By measuring this temperature rise with the temperature measuring device 20, it is possible to detect the number of operations of the lightning arrester and to measure the amount of current and the current value flowing through the lightning arrester 8. Based on the detection results of these detection means 18, it is possible to know the appropriate replacement timing of the lightning protection element 8. Note that the passing current value may be measured instead of measuring the passing current amount by the instrument current transformer 18A. Further, it is not necessary to provide both the current transformer 18A and the thermocouple probe 18B as the detecting means 18, and only one of them may be provided.

  In this case, it can be used as follows. In other words, the operating state of the lightning protection element 8 (for example, the passing current amount, the passing current value, the lightning protection element 8 temperature, etc.) is monitored by the detection means 18, and these values and the electrical stress generated in the GIS or GIL main body. By quantifying the correlation, it can be used as accurate condition-based maintenance. That is, when the lifespan of a lightning arrester is known (for example, when a certain amount of accumulated passing current amount is reached, when a certain amount of accumulated passing current value is reached, when a lightning arrester is activated a predetermined number of times, etc., For example, it can be used as an index of maintenance for each device part, such as “when the lightning arrester at the same place is replaced for the third time, the insulating spacer 3 of the part is also replaced at the same time”.

It is sectional drawing which shows 1st Embodiment of the gas insulated power apparatus of this invention. It is sectional drawing which shows 2nd Embodiment of the gas insulated power apparatus of this invention. It is a conceptual diagram in the case of performing voltage calibration using a calibration power supply. It is a conceptual diagram in the case of calibrating current using a calibration power supply. It is sectional drawing which shows 3rd Embodiment of the gas insulated power apparatus of this invention. It is sectional drawing which shows 4th Embodiment of the gas insulated power equipment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Grounding container 2 Conductor 3 Insulating spacer 4 Space 3a in grounding container Surface 3b of insulating spacer on grounding container side Conductive sleeve (member electrically connected to conductor)
5 Partition space 6 Hole 7 Closure member 11 Room 8 Lightning protection element 18A Instrument current transformer (detection means)
18B thermocouple probe (detection means)
12 Calibration power supply 17 Condition monitoring sensor

Claims (7)

  In a gas-insulated power device that encloses an insulating gas in a grounded container and accommodates a conductor, and supports the conductor in a state of being floated from the grounded container by an insulating spacer, the grounded container is provided in the insulating spacer and is provided in the grounded container. A partition space that is airtightly partitioned from the space and reaches the conductor or a member that is electrically connected to the conductor from a surface on the ground container side; and a hole provided in a portion of the ground container facing the partition space; A gas-insulated power device comprising a closing member that closes the hole so as to be openable.   The gas-insulated power apparatus according to claim 1, wherein a room communicating with the hole is provided inside the closing member to expand the partition space to the outside of the ground container.   The gas-insulated power device according to claim 1 or 2, wherein an insulating gas is sealed in the partition space.   The gas insulated power apparatus according to any one of claims 1 to 3, wherein a lightning protection element is accommodated in the partition space.   The gas-insulated power apparatus according to claim 4, further comprising detection means for detecting an operation state of the lightning protection element.   The gas-insulated power apparatus according to any one of claims 1 to 3, wherein a calibration power source for applying a calibration voltage or supplying a calibration current to the conductor is accommodated in the partition space.   The gas-insulated power apparatus according to any one of claims 1 to 3, wherein a state monitoring sensor that monitors a state in the ground container is accommodated in the partition space.

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