JP2011134904A - Carbon dioxide gas-insulating power apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a disorder in an apparatus regardless of use of environment-friendly and low-cost carbon dioxide gas as insulating gas. <P>SOLUTION: In a carbon dioxide gas-insulating power apparatus, a winding 2 configured by winding a wire coated with an insulating coating 2a on its outer peripheral surface and an insulating spacer 4 supporting the winding 2 are contained in a housing 1, and the power apparatus is filled with the carbon dioxide gas 3 as the insulating gas. The insulating spacer 4 is configured such that an outer peripheral surface of an insulating member 4a is covered with a reducing solid material 4b combined with oxygen which is generated together with CO when the carbon dioxide gas 3 is decomposed with discharge generated between it and the winding 2, and a sensor 6 detecting CO is disposed in an insulating gas atmosphere in the housing 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a carbon dioxide insulated power device capable of detecting an abnormality inside the device in a carbon dioxide atmosphere.

  For example, in a gas-insulated power device such as a gas-insulated transformer, SF6 gas excellent in insulation performance and cooling performance is used as an insulation gas filled in a container containing the device body.

  Conventionally, in such SF6 gas insulated power equipment, as a device or method for detecting the status of equipment and detecting the presence or absence of abnormality inside the equipment, the presence or absence of a fluorine compound generated from SF6 gas filled in the container is detected. There are those (for example, Patent Documents 1 to 3) and those for detecting the presence or absence of a decomposition gas other than a fluorine compound (for example, Patent Documents 4 and 5).

  Since SF6 gas contains a large amount of fluorine element, when it is decomposed by discharge or high temperature in the gas, fluorine compounds that do not exist in the natural atmosphere are generated, and most of them are active, and can be detected by a sensor.

  However, recently, as part of the environmental problem, SF6 gas has a global warming potential as large as 23900 times that of carbon dioxide.

  Therefore, in gas-insulated power equipment, when filling the container with SF6 gas, a long evacuation time and gas filling time are required after installation of the equipment or after opening the equipment for inspection. Therefore, there is a problem that the incidental construction cost increases and the construction period is prolonged, and the SF6 gas is an artificial gas, which is expensive.

  Therefore, as gas-insulated power equipment that does not use SF6 gas, if it is converted to cheap nitrogen gas or carbon dioxide gas, the price of equipment will be reduced and gas management regulations will be eased. The allowable temperature of the device can be set high, and the device can be reduced in size and price.

JP 05-011008 A JP 05-1888024 A Japanese Patent Laid-Open No. 04-181152 JP-A-01-052703

  However, these gases cannot be monitored by conventional detection of fluorine compounds as decomposition products due to partial discharge or high temperature.

  That is, when nitrogen gas is used as the insulating gas for gas-insulated power equipment, the nitrogen gas is composed of a single element, so there is no decomposition product gas, and the residual gas or the substance that constitutes the sealed equipment A product, for example NOx, is generated which reacts with

  In addition, when carbon dioxide is used as an insulating gas for gas-insulated power equipment, carbon dioxide is a gas composed of a compound of carbon and oxygen, so when decomposed by discharge or the like, it is decomposed into carbon monoxide and oxygen. Most of them recombine quickly and return to CO2, making it difficult to monitor the internal conditions of the equipment.

  Because of these problems, it is difficult to detect the internal state of the equipment by gas analysis using carbon dioxide as an insulating medium, so that it has not yet been converted to carbon dioxide as an insulating gas for gas-insulated power equipment.

  The present invention has been made in view of the above circumstances, and provides a carbon dioxide-insulated power device capable of detecting an abnormality inside the device even when an environmentally friendly and inexpensive carbon dioxide gas is used as the insulating gas. For the purpose.

  In order to achieve the above object, the present invention constitutes the following carbon dioxide insulated power equipment.

(1) The present invention accommodates a winding formed by winding a conducting wire whose outer peripheral surface is covered with an insulating coating in a casing, and an insulating spacer that supports the winding, and carbon dioxide gas is an insulating gas. In the carbon dioxide-insulated power device filled in as described above, the insulating spacer has a reducibility that combines with the oxygen generated together with CO by the carbon dioxide being decomposed by the discharge generated between the outer peripheral surface of the insulating member and the winding. A sensor that is covered with a solid substance and that detects CO in an insulating gas atmosphere in the housing is provided.

(2) The present invention accommodates a winding formed by winding a conducting wire whose outer peripheral surface is covered with an insulating coating in a casing, and an insulating spacer that supports the winding, and carbon dioxide gas is an insulating gas. In the carbon dioxide-insulated power device filled as, the insulating spacer is made of a resin made of carboxylic acid that generates CO when heated by the electric discharge generated between the windings, or made of carboxylic acid A sensor for detecting CO is provided in an insulating gas atmosphere in the casing, which is impregnated with resin.

(3) The present invention relates to a carbon dioxide insulated power device in which a winding formed by winding a conducting wire in a housing and an insulating spacer that supports the winding are housed and carbon dioxide is filled as an insulating gas. The winding has a structure in which a carboxylic acid that generates CO when heated by an electric discharge generated between the insulating spacers and an overcurrent flowing through the conductive wire is applied to the surface of the conductive wire, and insulation in the housing A sensor for detecting CO in the gas atmosphere is provided.

(4) The present invention relates to a carbon dioxide insulated power device in which a winding formed by winding a conducting wire in a housing and an insulating spacer that supports the winding are housed, and carbon dioxide is filled as an insulating gas. The winding is made of a conductive wire plated or alloyed with a metal containing ruthenium or rhenium, which has the effect of decomposing CO2 into CO when heated by a discharge generated between the insulating spacer and an overcurrent flowing through the conductive wire. A sensor for detecting CO in an insulating gas atmosphere in the casing is provided which is covered with an edge covering containing a halogen compound.

(5) The present invention relates to a carbon dioxide insulated power device in which a winding formed by winding a conducting wire in a housing and an insulating spacer that supports the winding are housed and carbon dioxide is filled as an insulating gas. The winding has a structure in which a metal conductor containing ruthenium which has an action of decomposing CO2 into CO when heated by an electric discharge generated between the insulating spacers or an overcurrent flowing through a conductive wire is covered with an alkali metal halide. And a sensor for detecting CO in an insulating gas atmosphere in the housing.

(6) The present invention relates to a carbon dioxide insulated power device in which a winding formed by winding a conducting wire in a housing and an insulating spacer that supports the winding are housed and carbon dioxide is filled as an insulating gas. Using an alloy that does not absorb or consume CO on the carbon dioxide exposed surface of metal materials such as the housing and conductors, and that does not contain nickel, and detects CO in the insulating gas atmosphere inside the housing A sensor is provided.

(7) The present invention relates to a carbon dioxide insulated power device in which a winding formed by winding a conducting wire in a housing and an insulating spacer that supports the winding are housed, and carbon dioxide is filled as an insulating gas. A chrome plating layer that does not allow CO to permeate is applied to a carbon dioxide gas exposed surface of a metal material such as the casing, and a sensor that detects CO in an insulating gas atmosphere in the casing is provided.

(8) The present invention provides a carbon dioxide insulated power device having a gas insulated switch in which a switch contact is housed in a housing and filled with carbon dioxide as an insulating gas. Is provided with a contact material so as to cover the tip of a base material made of a catalyst metal that can be decomposed into CO, and a sensor for detecting CO is provided in an insulating gas atmosphere in the casing.

  According to the present invention, it is possible to detect an abnormality inside the device even if an environmentally friendly and inexpensive carbon dioxide gas is used as the insulating gas.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows typically 1st Embodiment of the carbon dioxide insulated power apparatus provided with the abnormality detection function by this invention. The block diagram which shows typically 2nd Embodiment of the carbon dioxide insulated power apparatus provided with the abnormality detection function by this invention. The block diagram which shows typically 3rd Embodiment of the carbon dioxide insulated power apparatus provided with the abnormality detection function by this invention. The block diagram which shows typically a gas insulated switch as 4th Embodiment of the carbon dioxide insulated power apparatus by this invention.

(First embodiment)
FIG. 1 is a configuration diagram schematically showing a first embodiment of a carbon dioxide insulated power device having an abnormality detection function according to the present invention.

  In FIG. 1, reference numeral 1 denotes a casing. The casing 1 accommodates a winding 2 and is filled with carbon dioxide gas 3 as an insulating gas. The carbon dioxide gas 3 is disposed outside the casing 1. It is cooled by circulating through the cooler 5.

  The winding 2 is configured by arranging and fixing a plurality of unit windings 2c each having an outer peripheral surface covered with an insulating coating 2a with an insulating spacer 4 interposed therebetween. The

  In the first embodiment, in the carbon dioxide insulated power device having such a configuration, as the insulating spacer 4, the peripheral surface of the strip-shaped insulating member 4a is covered with a reducing solid material 4b such as quicklime, and a plurality of these are overlapped. It is composed. In addition, a sensor 6 for detecting CO is attached to the inner wall surface of the housing 1 in the vicinity of the cooler 5.

  In the carbon dioxide insulated power device configured as described above, when a partial discharge occurs between the insulating spacer 4 and the unit winding 2c, the carbon dioxide present in the space is decomposed by the discharge, and high-temperature CO and oxygen are decomposed. Will occur. The high-temperature oxygen generated in this portion is quickly combined with the reducing solid material 4b covering the peripheral surface of the insulating member 4a, and absorbs oxygen in the insulating medium.

  Therefore, since oxygen is removed from the surroundings of high-temperature CO, CO remains in the insulating gas. Since the insulating gas circulates between the housing 1 and the cooler 5 for cooling, it is included in the insulating gas by the sensor 6 attached to the inner wall surface of the housing 1 near the cooler 5. CO detected. As a result, the output of the sensor 6 can be analyzed and displayed on a monitor (not shown) to monitor the state inside the device.

(Second Embodiment)
FIG. 2 is a block diagram schematically showing a second embodiment of a carbon dioxide insulated power device having an abnormality detection function according to the present invention.

  In FIG. 2, reference numeral 21 denotes a casing. The casing 21 accommodates an iron core 27 and a winding 22 wound around the iron core 27 and is filled with carbon dioxide gas 23 as an insulating gas.

  The winding 22 is configured by arranging and fixing a plurality of unit windings 22c each composed of a copper wire 22b having an outer peripheral surface covered with an insulating covering 22a with an insulating spacer 24 interposed therebetween. The

  In the second embodiment, in the carbon dioxide insulated power device having such a configuration, the insulating spacer 24 is formed of a resin made of carboxylic acid or impregnated with a resin made of carboxylic acid, and the iron core 27 or copper A resin made of carboxylic acid is applied to the surface of the wire 22b.

  This resin made of carboxylic acid has the property of decomposing and generating CO when heated to a high temperature.

  A sensor 26 for detecting CO is attached to the inner wall surface of the housing 21.

  In the carbon dioxide insulated power device configured as described above, due to partial discharge generated between the insulating spacer 24 and the unit winding 22c, the unit winding 22c and the iron core 27, or an overcurrent flowing through the unit winding 22c. When these members are heated to a high temperature, the carboxylic acid is decomposed to generate CO. Since this decomposed carboxylic acid hardly adsorbs CO, CO is released into the insulating gas.

  When the insulating gas reaches the sensor 26 by convection, the sensor 26 detects CO contained in the insulating gas.

  Therefore, by analyzing and displaying the output of the sensor 26 with a monitor (not shown), it is possible to monitor the state inside the device.

  In the above embodiment, the case where a resin made of carboxylic acid is applied to the surface of the copper wire 22b has been described. However, as the winding 22, an edge containing a halogen compound around the copper wire 22b plated or alloyed with a metal containing ruthenium. You may give the to-be-coated thing 22a.

  Further, a metal conductor whose surface contains ruthenium as the winding 22 may be covered with an alkali metal halide.

  As described above, in the second embodiment, the insulating spacer 24 is composed of a resin that decomposes when heated to a high temperature and generates a large amount of CO, or is impregnated with a resin. Since the resin is applied to the surface of 22b, local heating inside the device can be detected from the outside. In addition, since the resin material can exhibit the insulating ability, it is not necessary to intervene a special member for detection. Furthermore, since the metal material can be used as a part of the copper wire, it is not necessary to intervene a special member for generating CO.

(Third embodiment)
FIG. 3 is a block diagram schematically showing a third embodiment of a carbon dioxide insulated power device having an abnormality detection function according to the present invention.

  In FIG. 3, reference numeral 31 denotes a casing. The casing 31 accommodates an iron core 37 and a winding 32 wound around the iron core 37 and is filled with carbon dioxide gas 33 as an insulating gas.

  The winding 32 is configured by arranging and fixing a plurality of unit windings 32c each composed of a copper wire 32b having an outer peripheral surface covered with an insulating covering 32a with an insulating spacer 34 interposed therebetween. The

  In the third embodiment, in the carbon dioxide insulated power device having such a configuration, an alloy that does not contain nickel is used for the metal material such as the casing 31 and the copper wire 32b, and the steel member such as the iron core 37 is chrome plated. Layer 38 is applied, and an alloy containing copper is applied to the iron alloy.

  A sensor 36 for detecting CO is attached to the inner wall surface of the housing 31.

  Here, examples of the alloy not containing nickel include chromium molybdenum steel, brass, brass, solder, phosphor bronze, stainless steel, duralumin, and silicon steel.

  In the carbon dioxide insulated power device configured as described above, due to the partial discharge generated between the insulating spacer 34 and the unit winding 32c, the unit winding 32c and the iron core 37, or the overcurrent flowing through the unit winding 32c. When these members are heated to a high temperature, the carbon dioxide gas filled as the insulating gas is decomposed to generate CO.

  Here, when an alloy containing nickel is used for the metal material such as the casing 31 and the copper wire 32b, CO reacts with nickel atoms to generate a carbonyl group. As a result, the detection by the sensor 36 becomes difficult. In addition, when CO comes into contact with steel such as the iron core 37, carbon dust enters the iron member, and metal dusting corrosion occurs in which oxygen is released.

  However, in the present embodiment, since an alloy that does not contain nickel is used for the metal material such as the casing 31 and the copper wire 32b, CO in the insulating gas is not absorbed or consumed. Further, when the chromium plating layer 38 is applied to the surface of a steel member such as the iron core 37, CO cannot permeate the chromium plating layer, so that metal dusting corrosion does not occur and CO is not consumed.

  As described above, in this embodiment, by suppressing the CO consumption in the metal member such as the casing 31 and the copper wire 32b, the CO generated by heating or partial discharge reaches the sensor 36 without being consumed or reduced. Therefore, the internal state of the device can be monitored with high sensitivity. Further, since the chrome plating layer 38 is applied to the surface of the steel member such as the iron core 37 or the iron alloy is alloyed with copper, the CO consumption is suppressed, so that the components of the device are not protected by a special member. The objective is achieved. In particular, since chromium is a magnetic substance, it does not affect the main magnetic flux of the iron core, and when manganese is mixed in the chromium layer, it exhibits antiferromagnetism, so that incidence of leakage magnetic flux and the like is suppressed, and eddy current loss is suppressed.

(Fourth embodiment)
FIG. 4 is a block diagram schematically showing a gas-insulated switch as a fourth embodiment of the carbon dioxide-insulated power device having an abnormality detection function according to the present invention.

  In FIG. 4, reference numeral 41 denotes a casing. The casing 41 accommodates a switch contact 42 such as a circuit breaker and is filled with carbon dioxide gas 43 as an insulating gas.

  As shown in FIGS. 4A and 4B, the switch contact 42 includes a fixed contact 42a and a movable contact 42b, and the movable contact 42b comes into contact with or is separated from the fixed contact 42a. Opening and closing is performed.

  In the fourth embodiment, in the gas insulated switch having such a configuration, as the movable contact 42b of the switch contact 42, a base 42b-1 made of a catalyst material such as magnesium or a magnesium alloy and the base 42b-1 The contact material 42b-2 having a high conductivity provided so as to cover the outer peripheral portion of the tip is formed.

  A sensor 46 for detecting CO is attached to the inner wall surface of the casing 41.

  In the gas insulated switch thus configured, the movable contact 42b is fixed as shown in FIG. 4 (b) from the state where the movable contact 42b is closed to the fixed contact 42a as shown in FIG. 4 (a). When the contact 42a is opened, the movable contact 42b is heated by the arc generated by the current interruption, and the contact material 42b-2 is sublimated and evaporated to be consumed.

  Then, as the number of times the contacts are opened and closed, the consumption of the contact material 42b-2 proceeds, the base material 42b-1 is exposed, and the base material 42b-1 is filled with carbon dioxide gas as an insulating gas in the housing 41. It is exposed to 43 atmospheres.

  When the contact is opened and closed in this state, when the base material 42b-1 constituting the movable contact 42b is heated by an arc generated between the fixed and movable contacts, the base material 42b-1 is a catalytic substance. To produce large amounts of CO.

  The generated CO diffuses into the insulating gas, and when it reaches the sensor 46 by convection, the sensor 46 detects CO contained in the insulating gas.

  Therefore, the consumption of the movable contact 42b can be easily determined by analyzing and displaying the output of the sensor 46 on a monitor (not shown).

  As described above, in the present embodiment, the switch contact 42 is accommodated in the housing 41 and the movable contact 42b constituting the switch contact 42 in the gas insulated switch filled with the carbon dioxide gas 43 as an insulating gas. Since the contact material 42b-2 having high conductivity is provided so as to cover the outer periphery of the tip of the base material 42b-1 made of the catalyst substance, the base material 42b- exposed by consumption / disappearance of the contact material 42b-2. When 1 is heated by the arc between the contacts, a large amount of carbon dioxide is decomposed and a large amount of CO is generated. By detecting this with the sensor 46, the consumption of the movable contact 42b can be easily determined.

  In the above embodiment, the catalyst material does not need to be a single material, and for example, an inexpensive magnesium alloy can be applied.

  1, 2, 31, 41 ... casing, 2, 22, 32 ... winding, 2a, 22a, 32a ... insulation coating, 2b, 22b, 32b ... copper wire, 2c, 22c, 32c ... unit winding, 3 , 23, 33, 43 ... carbon dioxide, 4, 24, 34 ... insulating spacer, 4a ... insulating member, 4b ... reducing solid material, 5 ... cooler, 6, 26, 36, 46 ... sensor, 27, 37 ... Iron core, 38 ... chrome plating layer, 42 ... switch contact, 42a ... fixed contact, 42b ... movable contact, 42b-1 ... base material made of catalytic substance, 42b-2 ... contact material

Claims (8)

A carbon dioxide gas insulation in which a winding formed by winding a conductive wire whose outer peripheral surface is covered with an insulating coating in a housing and an insulating spacer that supports the winding are housed and carbon dioxide is filled as an insulating gas. In power equipment,
The insulating spacer has a configuration in which an outer peripheral surface of an insulating member is covered with a reducing solid substance that is decomposed by the discharge generated between the winding and the carbon dioxide gas and is combined with oxygen generated together with CO.
A carbon dioxide-insulated power device comprising a sensor for detecting CO in an insulating gas atmosphere in the housing. With an outer peripheral surface in the housing is an insulating spacer for supporting the windings are accommodated as winding constituted by winding a conductive wire covered with an insulating coating, carbon dioxide insulating carbon dioxide gas is filled as an insulating gas In power equipment,
The insulating spacer is made of a resin made of carboxylic acid that generates CO when heated by the electric discharge generated between the windings or impregnated with a resin made of carboxylic acid,
A carbon dioxide-insulated power device comprising a sensor for detecting CO in an insulating gas atmosphere in the housing. In a carbon dioxide-insulated power device in which a winding constituted by winding a conducting wire in a housing and an insulating spacer that supports this winding are housed, and carbon dioxide is filled as an insulating gas,
The winding has a configuration in which a carboxylic acid that generates CO when applied by a discharge generated between the insulating spacer and an overcurrent flowing through the conductive wire is applied to the surface of the conductive wire,
A carbon dioxide-insulated power device comprising a sensor for detecting CO in an insulating gas atmosphere in the housing. In a carbon dioxide-insulated power device in which a winding constituted by winding a conducting wire in a housing and an insulating spacer that supports this winding are housed, and carbon dioxide is filled as an insulating gas,
The winding includes an outer sheath containing a halogen compound around a conductive wire plated or alloyed with a metal containing ruthenium that generates CO when heated by an electric discharge generated between the insulating spacer and an overcurrent flowing through the conductive wire. The structure is covered with a covering,
A carbon dioxide-insulated power device comprising a sensor for detecting CO in an insulating gas atmosphere in the housing. In a carbon dioxide-insulated power device in which a winding constituted by winding a conducting wire in a housing and an insulating spacer that supports this winding are housed, and carbon dioxide is filled as an insulating gas,
The winding has a configuration in which a metal conductor containing ruthenium that generates CO when heated by an electric current generated between the insulating spacer and an overcurrent flowing through a conductive wire is covered with an alkali metal halide,
A carbon dioxide-insulated power device comprising a sensor for detecting CO in an insulating gas atmosphere in the housing. In a carbon dioxide-insulated power device in which a winding constituted by winding a conducting wire in a housing and an insulating spacer that supports this winding are housed, and carbon dioxide is filled as an insulating gas,
Using an alloy that does not contain nickel and does not absorb or consume CO on the carbon dioxide exposed surface of the metal material such as the housing and copper wire,
A carbon dioxide-insulated power device comprising a sensor for detecting CO in an insulating gas atmosphere in the housing. In a carbon dioxide-insulated power device in which a winding constituted by winding a conducting wire in a housing and an insulating spacer that supports this winding are housed, and carbon dioxide is filled as an insulating gas,
A chrome plating layer that does not allow CO to pass through is applied to the carbon dioxide exposed surface of the metal material such as the housing,
A carbon dioxide-insulated power device comprising a sensor for detecting CO in an insulating gas atmosphere in the housing. In the carbon dioxide insulated power equipment provided with a gas insulated switch in which the switch contact is housed in the housing and carbon dioxide is filled as an insulating gas,
The switch contact has a configuration in which a contact material is provided so as to cover a tip portion of a base material made of a catalytic metal capable of decomposing carbon dioxide gas into CO.
A carbon dioxide-insulated power device comprising a sensor for detecting CO in an insulating gas atmosphere in the housing.

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