JP2008288380A - Insulator protection mechanism for oil-immersed electrical facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulator protection mechanism for oil-immersed electrical facility, which prevents the generation of secondary trouble, such as leakage of oil, blackout or the like, after the insulator is broken away from the main body of the oil-immersed electrical facility due to the abnormal rise of main body internal pressure in the oil-immersed electrical facility. <P>SOLUTION: The insulator protecting mechanism for the oil-immersed electrical facility, constituted so as to be provided with a casing made of a metal as a main body 100 and the insulator 106 for retaining a conductor penetrated through the inside and the outside of the main body 100 is provided on the side surface of the main body 100, is provided with a cover unit 5, provided so as to cover the site of the insulator 106 projected from the main body 100 to the outside to prevent the invasion of rain water into the main body 100 from the site where the insulator 106 is provided, and a regulating unit 6, arranged below the cover unit 5 so as to be opposed to the insulator 106, while the regulating unit 6 is constituted so as to regulate the amount of movement of the insulator 106 for the movement of the insulator 106 which tries to be broken away from the main body 100 with an abnormal rise of internal pressure of the main body 100. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an insulator protection mechanism for oil-filled electrical equipment installed outdoors, such as pole transformers and balancers attached to utility poles.

  Conventionally, a balancer attached to a utility pole is known as an oil-filled electrical facility installed outdoors. The balancer is used to improve the load imbalance of single-phase three-wire distribution lines. As shown in FIG. 9, the balancer includes a metal main body 100 that is a substantially rectangular parallelepiped casing. The main body 100 includes a base body 101 having a rectangular parallelepiped shape whose upper surface is open, and a lid body 102 provided so as to cover the upper surface of the base body 101. Then, the base 101 and the lid 102 are fixed by the fixing means 103 and 103 with packing (not shown) interposed so that the inside of the main body 100 is sealed.

  In addition, the device 104 (here, the coil 104) is provided inside the main body 100 in a state of being filled (enclosed) with insulating oil (not shown). Then, the three cables 105, 105, 105 for electrical connection with the device 104, that is, for energizing the device 104 are drawn from the side surface of the main body 100, and each cable 105 is held and insulated from the main body 100. The insulator 106 (here, the bushing 106) is provided on the side surface of the main body 100. Specifically, the insulator 106 is provided so as to be fitted into a hole on the side surface of the main body 100 so as to have portions protruding to the inner side and the outer side of the main body 100, respectively.

  The insulator 106 is provided with three connection terminals 106a, 106a, 106a on the inner side of the main body 100 (only one is shown in FIG. 9C), and each connection terminal 106a is connected to the insulator 106. Each cable 105 is energized via an internal energization section (not shown). Further, the three connection terminals 104a, 104a, 104a provided in the device 104 and the connection terminals 106a, 106a, 106a of the insulator 106 are electrically connected by three separately provided electric wires 107, 107, 107, respectively. The

  In this way, the device 104 inside the main body 100 has three lines that pass through the inside and the outside of the main body, such as the cable 105, the energization portion inside the insulator 106, the connection terminal 106a of the insulator 106, and the electric wire 107. It is electrically connected through the conductor. The conductors of the three lines are energized at different potentials. In general, the connection terminal 106a of the insulator 106 is often not subjected to insulation treatment. In addition, the electric wire 107 that connects the connection terminal 104a of the device 104 and the connection terminal 106a of the insulator 106 generally has a portion that is not subjected to insulation treatment (insulation coating), that is, a bare electric wire portion. There are many.

  The balancer is attached to the utility pole using a pair of substantially L-shaped suspension bolts 108, 108 that extend in the vertical direction and have a lower end bent at a substantially right angle. Specifically, the balancer is provided on the upper surface of the lid body 102 (main body 100) such that flat plate-like locking portions 102a and 102a each having a hole having a diameter larger than the diameter of the suspension bolt 108 are opposed to each other. And the lower end part of each suspension bolt 108 is inserted and latched in the hole of each latching | locking part 102a. Further, the upper side of each suspension bolt 108 is inserted and fixed into holes provided on both ends of the flat support plate 109. As a result, as shown in FIG. 10, the support plate 109 is locked to the arm metal 111 extending in the horizontal direction from the utility pole 110, and the balancer is attached to the utility pole 110.

  By the way, for example, when lightning occurs and is transmitted to the distribution line, the voltage of the device 104 provided inside the main body 100 may rapidly increase. Then, the insulating oil on the surface of the device 104 boils instantaneously and the gas inside the main body 100 expands, so that the pressure inside the main body 100 rises rapidly. As a result, the insulator 106 fixed to the side surface of the main body 100 cannot withstand the abnormally increased internal pressure, so that the fixed state with the main body 100 is released and the insulator 106 jumps away (detaches) from the main body 100. .

  Since the balancer damaged by the separation of the insulator 106 can no longer function, it must be replaced with a new balancer. However, even if the balancer is damaged, there is often no influence such as a power failure, so the damage of the balancer cannot be found and may not be immediately replaced with a new balancer.

  Therefore, conventionally, an operator regularly inspects the power distribution equipment to find a damaged balancer and replace it with a new balancer. If a trouble such as a power failure occurs at the same time due to damage to the balancer, the balancer can be found damaged during the power failure recovery work, and is replaced with a new balancer at the time of discovery.

  However, it is very time consuming to check the distribution facilities installed over a wide area. Therefore, the damaged balancer may cause a secondary trouble before the operator finds the damaged balancer and replaces it with a new balancer.

  For example, when time elapses in a state where the insulator 106 provided on the side surface of the main body 100 of the balancer is detached, each cable 105 may be gradually bent due to the influence of the weight of the insulator 106 and the like. Then, conductors such as the connection terminal 106a of the insulator 106 that is not insulated and the bare wire portion of the electric wire 107 that connects between the connection terminal 104a of the device 104 and the connection terminal 106a of the insulator 106 are energized at different potentials. There may be a short-circuit accident that contacts the conductor of the other line, or a ground fault that contacts the metal main body 100, causing a power failure.

  Further, when the insulator 106 is detached from the main body 100, a hole on the side surface of the main body 100 for attaching the insulator 106 becomes an opening that communicates from the outside of the main body 100 to the inside. Therefore, when it rains, rainwater enters the inside of the main body 100 from the opening formed on the side surface of the main body 100. Then, the insulating oil inside the main body 100 overflows from the opening on the side surface of the main body 100 and may leak and contaminate trees and roads below the balancer. Furthermore, if rainwater intrudes into the main body 100 continuously, the insulating function of the insulating oil inside the main body 100 deteriorates, so that a power failure due to a short circuit accident or a ground fault may occur.

  Therefore, in view of such circumstances, the present invention causes secondary troubles such as oil leakage and power failure after the insulator is detached from the body of the oil-filled electrical equipment due to an abnormal increase in the internal pressure of the body in the oil-filled electrical equipment. It is an object of the present invention to provide an insulator protection mechanism for oil-filled electrical equipment that prevents this from occurring.

  The insulator protection mechanism for oil-filled electrical equipment according to the present invention includes a main body that is a metal casing, and an insulator for holding a conductor that passes through the inside and outside of the main body side surface. An insulator protection mechanism for oil-filled electrical equipment provided on the side of the main body, where the insulator protrudes outward from the main body to prevent rainwater from entering the main body from the portion where the insulator is provided The cover is provided so as to cover from above, and the restricting part is provided below the cover so as to face the insulator, and the insulator is detached from the main body as the internal pressure of the main body increases abnormally. The restriction portion is configured to restrict the amount of movement of the insulator against the movement to be performed.

  According to the present invention, even when the insulator is released from the main body due to an abnormal increase in the internal pressure of the main body, the insulator is restrained by the restricting portion, and the amount of movement of the insulator is restricted. Is done. Therefore, the insulator is not detached from the main body due to an abnormal increase in the internal pressure of the main body, and as a result, it is possible to prevent a conducting conductor from coming into contact with the metal main body.

  In addition, when the fixed state between the insulator and the main body is released, a gap is formed between the side surface of the main body and the insulator, but since the insulator does not separate from the main body, the gap is small, and Since the cover portion that covers the insulator from above prevents the rainwater from dripping near the formed gap, the rainwater can be prevented from entering the main body.

  Moreover, in the insulator protection mechanism for oil-filled electrical equipment according to the present invention, the restricting portion may include an elastic body at a portion facing the insulator. According to such a configuration, when the insulator is about to be detached from the main body due to an abnormal increase in the internal pressure of the main body, the impact of the elastic body on the insulator is reduced, so that the insulator can be prevented from being damaged. Therefore, since the energization part inside an insulator is not exposed, it can maintain that the conductor to energize insulates from a metal main part.

  Moreover, when the insulator is damaged, the portion of the side surface of the main body where the insulator is provided is greatly opened. However, since the damage of the insulator can be prevented, the portion of the side surface of the main body provided with the insulator is greatly opened. Therefore, rainwater can be prevented from entering the main body.

  Further, in the insulator protection mechanism for oil-filled electrical equipment according to the present invention, two or more restricting portions may be provided so as to abut against the insulator with respect to the movement of the insulator to be detached from the main body. . According to this configuration, when the insulator is about to be detached from the main body due to an abnormal increase in the internal pressure of the main body, the insulator comes into contact with two or more restriction portions. Thereby, for example, even if the insulator tries to rotate with one restricting portion as a fulcrum, the other abutting restricting portion opposes the rotational moment, so that the insulator can be prevented from rotating. Therefore, the insulator can be stopped in a more stable state than when the amount of movement of the insulator is restricted by one restricting portion.

  The insulator protector for oil-filled electrical equipment according to the present invention is characterized by being provided with the insulator protection mechanism. According to such a configuration, when the insulator protective device is fixed to the oil-filled electrical equipment, even if the insulator is released from the fixed state due to the abnormal increase in the internal pressure of the main body, Since the amount of movement of the insulator is regulated, the insulator is not detached from the main body, and as a result, it is possible to maintain that the device inside the main body and the conducting conductor are insulated from the metal main body. Moreover, since the cover part which covers an insulator from upper direction is provided, it can prevent that rainwater permeates into the inside of a main body.

  The oil-filled electrical equipment according to the present invention is characterized in that the main body is provided with the insulator protection mechanism. According to such a configuration, even if the insulator is released from the main body after being released from the main body due to an abnormal increase in the internal pressure of the main body, the amount of movement of the insulator is restricted by the restriction portion provided in the main body portion. Therefore, the insulator is not detached from the main body, and as a result, it is possible to maintain that the device inside the main body and the conducting conductor are insulated from the metal main body. Moreover, the cover part which covers an insulator from the top prevents intrusion of rainwater into the main body.

  Therefore, according to the present invention, it is possible to maintain the insulation between the device inside the main body and the conducting conductor from the metal main body, and to prevent rainwater from entering the main body. After the insulator is detached from the main body of the oil-filled electrical equipment due to an abnormal rise in pressure, it is possible to prevent the occurrence of secondary troubles such as oil leakage and power failure.

  Hereinafter, an embodiment of an insulator protector for an oil-filled electrical facility including an insulator protection mechanism according to the present invention will be described with reference to the accompanying drawings. In the present embodiment, the oil-filled electrical equipment is an example of a balancer attached to a utility pole. Moreover, in FIGS. 1-3, the part which attached | subjected the code | symbol same as the code | symbol of FIGS. 9-10 represents the structure or element same as a prior art.

  The insulator protector 1 (hereinafter simply referred to as “protector”) of the oil-filled electrical facility according to the present embodiment is disposed above the insulator 106 provided on the side surface of the main body 100 as shown in FIGS. The first member 2 and the second member 3 disposed below the first member 2 and facing the insulator 106 are provided. The protector 1 is fixed to the main body 100 by fixing means 4 (here, metal bands 4 and 4).

  The first member 2 is provided with a cover portion 5 that covers a portion of the insulator 106 that protrudes outward from the main body 100 from above in order to prevent rainwater from entering the main body 100 from the portion where the insulator 106 is provided. . Specifically, the first member 2 is formed so as to cover the lid 102 and the insulator 106 from above, and constitutes the cover portion 5 at a portion protruding from the lid 102. The first member 2 is formed in a rectangular plate shape.

  And when the 1st member 2 is attached to a balancer, in order to prevent interfering with the latching part 102a of the cover 102, and the lower end side of the suspension bolt 108, the latching part 102a of the cover 102 and the suspension bolt Holes 2 a and 2 a are formed in a portion corresponding to the lower end side of 108. Further, the first member 2 is formed by fixing a pair of member pieces 2b, 2c divided so as to cross the two holes 2a, 2a by fixing means 2d,.

  Specifically, when the pair of member pieces 2b, 2c each having two recesses 2e, 2e are fixed by the fixing means 2d,..., The recesses 2e, 2e of one member piece 2b and the other member pieces 2c The recesses 2e and 2e form the holes 2a and 2a of the first member 2. The pair of member pieces 2b and 2c are rectangular and are formed to be symmetric. The pair of member pieces 2b and 2c are rigid bodies formed of metal, hard resin, or the like.

  The first member 2 moves one member piece 2b from one side surface (the left side in FIGS. 1 and 2) of the main body 100, and moves the other member piece 2c to the other side surface (the figure). 1 and the right side in FIG. 2, and the pair of member pieces 2b, 2c are fixed by fixing means 2d,. Therefore, the first member 2 including the pair of member pieces 2b and 2c is attached to the main body 100 without interfering with the locking portion 102a of the lid 102 and the lower end side of the suspension bolts 108 and 108. Thereby, the first member 2 is attached to the main body 100 even when the main body 100 is attached to the utility pole by the suspension bolts 108 and 108 and the support plate 109 (not shown in FIGS. 1 to 3).

  The second member 3 is a regulation facing the insulator 106 so as to regulate the amount of movement of the insulator 106 with respect to the movement of the insulator 106 from the body 100 due to an abnormal increase in the internal pressure of the body 100. Part 6 is provided. Specifically, the second member 3 includes two restricting portions 6 and 6 with which the insulator 106 abuts when the insulator 106 is about to be detached from the main body 100. The separation distance between the restricting portion 6 and the insulator 106 is a portion of the insulator 106 located on the inner side from the outer surface of the main body 100, and is a length dimension in a direction in which the restricting portion 6 and the insulator 106 face each other. Set small.

  Specifically, the second member 3 includes a rectangular parallelepiped portion whose upper surface is in contact with the lower surface of the first member 2 and two plate-like portions that extend downward from the lower surface of the rectangular parallelepiped portion and face the insulator 106. And the restricting portions 6 and 6 are constituted by the plate-like portions. More specifically, the second member 3 is provided so that two plate-like portions having a thickness are substantially parallel to each other, and the two plate-like portions are substantially the same as the side surface of the main body 100 on which the insulator 106 is provided. It is provided to be orthogonal. In addition, the second member 3 is arranged such that two plate-like portions (regulating portions 6 and 6) are provided between the three cables 105, 105, and 105 drawn into the side surface of the main body 100, respectively.

  The restricting portion 6 includes an elastic body 6 a at a portion facing the insulator 106 in order to reduce an impact applied to the insulator 106. The elastic body 6 a is fixed to a surface of the plate-like portion of the second member 3 that faces the insulator 106 by a fixing means (not shown) such as an adhesive, and is disposed so as to face the insulator 106. Specifically, the elastic body 6a is formed in a rectangular parallelepiped shape. And the elastic body 6a is formed with materials, such as rubber | gum which can absorb an impact.

  Further, the second member 3 is a rigid body in which a portion excluding the elastic body 6a is formed of metal, hard resin, or the like. The second member 3 is fixed to the first member 2 by the fixing means 3a and 3a so that the upper surface of the rectangular parallelepiped portion is in contact with the lower surface of the first member 2.

  In addition, the protective device 1 has a sealing material interposed or sealed (adhered) with a sealing material for a slight gap generated at a contact portion between rigid bodies such as the main body 100, the first member 2, and the second member 3. And it may be waterproofed. For example, the packing 7 is interposed between the upper surface of the lid 102 and the lower surface of the first member 2, the packing 8 is interposed between the lower surface of the first member 2 and the upper surface of the second member, The packing 9 may be interposed between the pair of member pieces 2b and 2c of the member 2. Further, the holes 2a and 2a of the first member 2 may be filled (enclosed) with a silicone material.

  The configuration of the protector 1 according to this embodiment is as described above. Next, the operation of the protector 1 according to this embodiment protecting the insulator 106 will be described.

  For example, when the internal pressure of the balancer main body 100 rises abnormally due to the occurrence of a lightning strike, the insulator 106 is released from the fixed state with respect to the main body 100 and is thus separated from the main body 100. Collides with parts 6 and 6. Then, the insulator 106 is restrained by the restricting portion 6 while the impact is alleviated by the elastic body 6a. At this time, the insulator 106 is not damaged because the impact is alleviated by the elastic body 6a. Therefore, the energization part inside the insulator 106 is not exposed.

  Further, since the insulator 106 is restrained by contacting with the two plate-like portions of the second member 3 in the up-and-down direction, the insulator 106 rotates around the contact portion in the one up-and-down direction as the other axis. It is regulated at the contact part. In addition, since the portion of the cable 105 located in the vicinity of the side surface of the main body 100 is disposed between the two restricting portions 6 and 6, even if the insulator 106 tries to rotate with one restricting portion 6 as a fulcrum, the other The restricting portion 6 comes into contact with the cable 105. Also by this, since the insulator 106 is restricted from rotating, it is reliably restrained in a stable state.

  Therefore, the insulator 106 moves slightly away from the main body 100 from the position fixed to the side surface of the main body 100, but is held by the main body 100. Specifically, the length of the insulator 106 fitted into the inner side from the outer surface of the main body 100 in the direction in which the restricting portion 6 and the insulator 106 face each other is between the restricting portion 6 and the insulator 106. Therefore, the insulator 106 is held (latched) on the main body 100. More specifically, the insulator 106 is held in a state in which the surface of the portion that has been fitted inside the main body 100 is caught in the hole on the side surface of the main body 100 where the insulator 106 is fixed.

  Moreover, since the insulator 106 is held (latched) by the main body 100, the cable 105 does not bend over time. Therefore, conductors such as connection terminals 106a (not shown in FIGS. 1 to 3) of the insulator 106 and bare wire portions of the electric wires 107 (not shown in FIGS. 1 to 3) inside the main body 100 are energized at different potentials. There is no contact with the conductor of the track or contact with the metal body.

  In addition, since the insulator 106 is held by the main body 100, a gap is formed between the side surface of the main body 100 and the insulator 106. However, since the insulator 106 is not separated from the main body 100, the gap is small. . Therefore, even if it rains, there is only a slight gap on the side surface of the main body 100, so that rainwater hardly enters the main body 100. Further, since the cover portion 5 that covers the insulator 106 from above prevents the rainwater from dripping near the gap formed on the side surface of the main body 100, the rainwater is surely prevented from entering the main body 100.

  Since the insulator 106 is not damaged by the elastic body 6a, the gap formed on the side surface of the main body 100 can be easily closed when the damaged balancer is replaced with a new balancer. Specifically, the insulator 106 released from the fixed state with respect to the main body 100 is returned to the fixed position, and in that state, the insulator 106 is fixed again to the main body 100 with a band or the like. Thereby, when the balancer (main body 100) is removed from the utility pole and lowered to the ground, it is possible to prevent oil leakage from the inside of the main body 100 even if the balancer (main body 100) is inclined.

  As described above, the insulator protector 1 of the oil-filled electrical equipment according to the present embodiment is provided with the cover portion 5 so as to cover the insulator 106 from above, and extends downward from the cover portion 5 to Since the restricting portion 6 facing in the direction is provided, the insulator 106 is held by the main body 100 even when the insulator 106 is released from the fixed state with the main body 100 due to an abnormal increase in the internal pressure of the main body 100. I will not leave. Therefore, since it can maintain that the energized conductor is insulated from the metal main body 100, it is possible to prevent a secondary trouble such as a power failure from occurring. Furthermore, since rainwater can be prevented from entering the main body 100 even if it rains, secondary troubles such as oil leakage can be prevented.

  Further, the insulator protector 1 of the oil-filled electrical equipment according to the present embodiment is arranged so that the insulator 106 collides (contacts) with the elastic body 6a when the insulator 106 is about to be detached from the main body 100. Therefore, it is possible to prevent the insulator 106 from being damaged when stopped by the restricting portion 6. Therefore, since the current-carrying portion inside the insulator 106 is not exposed, it can be reliably maintained that the current-carrying conductor is insulated from the metal main body 100, and as a result, secondary troubles such as power failure can be reliably generated. Can be prevented.

  Further, in the insulator protector 1 of the oil-filled electrical equipment according to the present embodiment, since the two restricting portions 6 and 6 come into contact with the insulator 106 and stop, the insulator 106 comes into contact with one restricting portion 6. It is possible to prevent rotation around the part. Further, since the two restricting portions 6 and 6 disperse the force received by the collision with the insulator 106, the impact received by each restricting portion 6 is smaller than in the case where there is one restricting portion 6. Therefore, it is possible to design the impact resistance strength of each restricting portion 6 to be smaller than in the case where there is one restricting portion 6.

  By the way, the insulator protection mechanism of the oil-filled electrical equipment of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention. Then, the various modifications concerning the insulator protection mechanism of the oil-filled electrical equipment of this invention are demonstrated with reference to FIGS. 4-8, the part which attached | subjected the code | symbol same as the code | symbol of FIGS. 1-3 represents the structure or element same as the said embodiment, and attaches | subjects the code | symbol same as the code | symbol of FIGS. These parts represent the same components or elements as in the prior art.

  In the said embodiment, although the case where the 1st member 2 consists of a pair of member piece 2b, 2c which can be divided | segmented so that the protector 1 could be attached also to the balancer fixed to the utility pole, FIG. As shown in FIG. 1, the first member 11 of the protective device 10 may be composed of one member. Specifically, the protector 10 may be a case where the first member 11 is formed of one member including the cover portion 12. According to this configuration, it is possible to omit the configuration such as the fixing means 2d for fixing the pair of member pieces 2b and 2c, and the packing 9 interposed between the pair of member pieces 2b and 2c.

  However, the first member 11 needs to be placed on the main body 100 from above so that the locking portion 102a of the lid portion 102 and the suspension bolt 108 are inserted into the hole portion 11a provided inside. Therefore, the protector 10 including the first member 11 can be employed when the balancer (main body 100) is attached before being fixed to the utility pole by the support plate 109 (not shown in FIG. 4).

  Moreover, in the said embodiment, although the case where the protector 1 was fixed to the main body 100 by the fixing means 4 of another member was demonstrated, as shown in FIG. Means 14 may be provided. According to such a configuration, it is not necessary to modify the main body 100 or prepare the fixing means 4 for another member in order to attach the protector 13 to the main body 100. It can also be easily attached to the main body 100.

  Specifically, the protective device 13 is provided with a fixing means 14 for fixing the main body 100 to a first member 16 provided with a cover portion 15 that covers the insulator 106 from above. The fixing means 14 includes a first fixing portion 14a and a second fixing portion 14b arranged so as to sandwich a pair of opposing side surfaces of the main body 100, and further, a separation distance between the first fixing portion 14a and the second fixing portion 14b. The position adjusting means 14c capable of adjusting the position is provided.

  When the distance between the first fixing portion 14a and the second fixing portion 14b is reduced by the position adjusting means 14c, the first fixing portion 14a and the second fixing portion 14b face the main body 100. Abut against each of the pair of side surfaces. When the position adjustment means 14c tries to further reduce the separation distance, the separation distance is constant, but the pressing force by sandwiching the first fixing portion 14a and the second fixing portion 14b acts on the main body 100. The protector 13 is fixed to the main body 100.

  More specifically, in FIG. 5, the first fixing portion 14 a corresponds to the contact surface of the first member 16 that contacts the side surface of the lid body 102 on the side where the insulator 106 is provided via the packing 17. The second fixing portion 14b corresponds to a screw portion (tip portion) that contacts the side surface of the lid 102 that faces the side surface. The position adjusting means 14c corresponds to a hole portion in which a female screw is formed on the inner peripheral surface and a surface portion of the screw in which a male screw corresponding to the female screw is formed. The hole is formed through a portion fixed to the first fixing portion 14a in a direction in which the first fixing portion 14a and the second fixing portion 14b face each other.

  Then, after the contact surface which is the first fixing portion 14a is in contact with the side surface of the lid body 102 with the packing 17 interposed therebetween, when the screw screwed into the hole portion is rotated, the second fixing portion 14b is obtained. The tip of the screw comes into contact with the side surface of the lid 102 facing the side surface. When the screw is further rotated, the contact surface that is the first fixing portion 14a and the tip end portion of the screw that is the second fixing portion 14b are pressed with the lid body 102 interposed therebetween, so that the protective device 13 is fixed to the lid body 102. The

  Moreover, in the said embodiment, although the case where the protector 1 provided with an insulator protection mechanism was attached to the main body 100 was demonstrated, as shown in FIG. 6, you may provide the main body 18 with an insulator protection mechanism. According to such a configuration, the body 18 itself of the oil-filled electrical equipment can be provided with a function of protecting the insulator 106, so that the work of attaching the protector 1 to the oil-filled electrical equipment can be omitted.

  Specifically, the main body 18 includes a base body 101 having a rectangular parallelepiped shape whose upper surface is open, and a lid body 19 provided so as to cover the upper surface of the base body 101. The lid body 19 is provided with a cover portion 20 that covers a portion of the insulator 106 that protrudes from the base body 101 from above to prevent rainwater from entering the inside of the main body 18 from a portion where the insulator 106 is provided.

  The lid 19 faces the insulator 106 so as to regulate the amount of movement of the insulator 106 with respect to the movement of the insulator 106 that is about to be detached from the body 100 due to an abnormal increase in the internal pressure of the main body 100. Two restricting portions 21 and 21 are provided. Further, the restricting portion 21 includes an elastic body 21 a at a portion facing the insulator 106 in order to reduce an impact applied to the insulator 106 when stopping the insulator 106 that is about to be detached from the main body 100.

  In the above embodiment, the case where one insulator 106 is provided on the side surface of the main body 100 has been described. However, as shown in FIG. 7A, for example, each cable 105 is provided with an insulator 113. Also good. In short, the main body 112 may be provided with a plurality of insulators 113 (three are provided in FIG. 7A). In this case, it is preferable that two or more restricting portions 22 are provided for each insulator 113. According to this configuration, when each insulator 113 is about to be detached from the main body 112, the insulator 113 comes into contact with the plurality of restricting portions 22. It can prevent rotating as a fulcrum.

  Moreover, in the said embodiment, although the case where an oil-filled electrical installation was a balancer was demonstrated as an example, oil-filled electrical installations, such as a pole transformer and a transformer arrange | positioned on the ground, may be sufficient. In short, any oil-filled electrical equipment may be used as long as the insulator 106 is provided on the side surface of the main body 100 and the sealed main body 100 is filled (sealed) with insulating oil.

  Moreover, in the said embodiment, although the case where the upper surface of the 1st member was flat form was demonstrated, the upper surface of the 1st member 2 may incline and be formed. Specifically, the upper surface of the first member 2 is provided with a gradient such that rainwater dropped on the upper surface flows from the side surface side of the main body 100 where the insulator 106 is provided to the side surface side of the main body 100 facing the side surface. May be. According to such a configuration, it is possible to prevent rainwater dropped on the upper surface of the first member 2 from flowing toward the insulator 106 side.

  Moreover, in the said embodiment, although the case where the protective equipment 1 was provided with the 1st member 2 and the 2nd member 3 was demonstrated as an example, the 1st member 2 and the 2nd member 3 were integrated. It may be composed of a single member. According to such a configuration, it is possible to omit the configuration such as the fixing means 3 a for fixing the first member 2 and the second member 3 and the packing 8 interposed between the first member 2 and the second member 3.

  Further, in the above-described embodiment, the case has been described in which the two regulating portions 6 that contact when the insulator 106 is to be detached from the main body 100 have been described. However, the insulator 106 contacts when the insulator 106 is to be detached from the main body 100. Three or more regulating parts 6 may be provided.

  Further, in the above embodiment, the case where the insulator 106 and the regulating portion 6 (elastic body 6a) are separated from each other before the insulator 106 is released from the fixed state with the main body 100 has been described. Before the body 106 releases the fixed state to the main body 100, the insulator 106 and the restricting portion 6 (elastic body 6a) may be disposed in contact with each other. However, when the internal pressure of the main body 100 is abnormally increased, the insulator 106 is damaged or the main body 100 is deformed unless the insulator 106 is released from the fixed state with the main body 100 and the internal abnormal pressure is released to the outside. It is dangerous. Therefore, before the insulator 106 is released from the fixed state with respect to the main body 100, the elastic body 6a is an essential configuration when the insulator 106 and the restricting portion 6 are disposed in contact with each other. It needs to be configured to be movable from the main body 100.

  In the insulator protection mechanism for oil-filled electrical equipment according to the present invention, as shown in FIG. 7B, when the insulator 106 is about to be detached from the second member 24 provided with the restricting portion 23, or A latching portion 25 disposed below the insulator 106 may be provided so as to face the insulator 106 so that the insulator 106 is received and latched from below when detached. According to such a configuration, when the insulator 106 is about to be detached or detached, the insulator 106 can be latched and held by the latch portion 24 from below, so that the conducting conductor is made of metal. Insulation from the main body 100 can be further ensured.

  Further, in the insulator protection mechanism for oil-filled electrical equipment according to the present invention, as shown in FIG. 8, when the insulator 106 is released from the fixed state with the main body 100, the display means 26 displays the release of the fixed state. May be provided. According to this configuration, when an operator periodically checks the power distribution equipment, a balancer in which the insulator 106 is released from the fixed state with respect to the main body 100, that is, a damaged balancer can be easily found.

  Specifically, the display means 26 is insulated from the restricting portion 6 (elastic body 6a) so as to collide with the insulator 106 when the insulator 106 is released from the fixed state with respect to the main body 100. It is arranged between the body 106. The display means 26 includes a display material 26 a indicating that the insulator 106 has been released from the fixed state with the main body 100, and an outer shell portion that wraps the display material 26 a and is formed to be damaged due to the collision of the insulator 106. 26b. For example, the display material 26a can use paint such as ink or paint, and the outer shell portion 26b can use hard resin such as plastic or synthetic resin. Further, the outer shell portion 26b is formed thin so as to be broken when it collides with the insulator 106.

  And when the insulator 106 tries to detach from the main body 100 and collides with the display means 26 disposed between the restricting portion 6 (elastic body 6a) due to an abnormal increase in the internal pressure of the main body 100, the outer shell portion 26b is damaged. . As a result, the display material 26 a wrapped in the outer shell portion 26 b adheres to the insulator 106. Therefore, since the display material 26a is attached to the insulator 106 that has been fixed to the main body 100, it is easy to find a damaged balancer. In particular, when inspecting a balancer attached to a utility pole from the ground, it has been difficult in the past to find a damaged balancer, but this makes it easier.

  The display unit 26 includes a detection unit that detects that the insulator 106 is released from the fixed state with respect to the main body 100, and an output unit that outputs a notification of the release of the fixed state based on a detection signal from the detection unit. May be. For example, the detection means may use a sensor such as a pressure detection sensor that detects a pressure generated when the insulator 106 collides with the regulating unit 6 or a position detection sensor that detects a displacement of the insulator 106. The output means may be a means for turning on an indicator lamp or outputting sound.

  In addition, as for the insulator protection mechanism of the oil-filled electrical equipment of the present invention, it is needless to say that one or two or more configurations may be appropriately adopted for the various modifications described above.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general view of an insulator protector provided with the insulator protection mechanism which concerns on one Embodiment of this invention, Comprising: A top view is shown. It is a whole view of the same insulator protector, Comprising: A front view is shown. It is a whole view of the same insulator protective device, Comprising: A side view is shown. It is a general view of the insulator protector provided with the insulator protection mechanism of the oil-filled electrical installation which concerns on other embodiment of this invention, Comprising: (a) is a top view, (b) is a front view, (c) Shows a side view. It is a general view of the insulator protector provided with the insulator protection mechanism which concerns on other embodiment of this invention, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. Indicates. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of oil-filled electrical equipment provided with the insulator protection mechanism which concerns on one Embodiment of this invention, Comprising: (a) is a top view, (b) is a front view, (c) shows a side view. . It is the schematic of the example of a change of the insulator protection mechanism of this invention, (a) is a front view, (b) shows the side view of another example of a change. It is the schematic of the further another modified example of the insulator protection mechanism of this invention, Comprising: (a) is a side view, (b) shows sectional drawing. It is a general view of the conventional oil-filled electrical installation, (a) is a top view, (b) is a front view, (c) shows a side view. It is a whole figure of the conventional oil-filled electrical installation, Comprising: The state attached to a utility pole is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,10,13 ... Insulator protective device, 5, 12, 15, 20 ... Cover part, 6, 21, 22 ... Restriction part, 6a, 21a ... Elastic body, 18 ... Main body, 100 ... Main body, 106 ... Insulator (Bushing)

Claims (5)

  Insulator protection for oil-filled electrical equipment, comprising a body that is a metal casing, and an insulator for holding a conductor that passes through the inside and outside of the body side. In order to prevent rainwater from entering the inside of the main body from the portion where the insulator is provided, a cover portion provided so as to cover the portion of the insulator projecting from the main body to the outside from above, and the cover portion And a regulating portion that is disposed below and is provided so as to face the insulator, and the regulating portion moves the insulator in response to the movement of the insulator that is about to be detached from the body due to an abnormal increase in pressure inside the body. Insulator protection mechanism for oil-filled electrical equipment, characterized by being configured to regulate   The insulator protection mechanism for oil-filled electrical equipment according to claim 1, wherein the restricting portion includes an elastic body at a portion facing the insulator.   The insulator protection mechanism for oil-filled electrical equipment according to claim 1 or 2, wherein two or more restricting portions are provided so as to abut against the insulator when the insulator is about to move away from the main body.   An insulator protector for oil-filled electrical equipment, comprising the insulator protection mechanism according to any one of claims 1 to 3.   An oil-filled electrical installation comprising the main body provided with the insulator protection mechanism according to any one of claims 1 to 3.

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