JP5761108B2 - Solid insulation bus termination connection - Google Patents

Description

  The present invention relates to a solid insulation bus used for communication between power receiving boards such as cubicle type gas insulated switchgear (GIS) and vacuum insulated switchgear, and a terminal connection part of a solid insulated bus. The present invention relates to a solid insulation bus used in a power receiving board mounted on a ship, and a terminal connection portion of the solid insulation bus.

  A conventional vacuum insulated switchgear has a row structure in which a high voltage current from the outside is supplied by a cable and a plurality of power receiving panels are installed in parallel. The power receiving panels are electrically connected to each other by a solid insulating bus for connecting the boards through a T-shaped cross adapter having an opening in the horizontal direction. Such solid insulated buses are used for three phases (w phase, v phase, u phase), and are arranged in each power receiving panel while obliquely shifting the position of each cross adapter. It should be noted that the power receiving panels located at both ends are electrically connected using an inverted L-shaped end adapter instead of a cross adapter.

  FIG. 5 is a partial cross-sectional view showing a terminal connection portion of a conventional solid insulated bus.

  The terminal connection portion includes a cross-adapter connection conductor 110 having a structure mainly divided into two vertically, a solid insulation bus 113 in which an insulating layer 112 is coated on the conductor 111, a bushing-side connection conductor 120, and a bushing that covers the outer periphery thereof. A side mold 260, a mold 121, and a stud bolt 122 are provided. Further, the cross adapter connection conductor 110 has through holes that cross each other in the horizontal direction and the vertical direction, and stud bolts 122 are inserted into the through holes in the vertical direction to form recesses (screw holes) of the bushing side connection conductor 120. At the same time, the conductor portions of the solid insulation bus 113 are inserted into the horizontal through holes. And this conductor part is opposingly arranged so that the inserted stud bolt 122 may be pinched | interposed, and by screwing the nut 123 to the stud bolt 122 from the upper side, the conductor part can be connected via the cross adapter connecting conductor 110 having a two-part structure. It is pinched and fixed.

  The structure of the terminal connection portion of such a solid insulated bus is excellent as a structure for easily supplying a high voltage current, but it is particularly necessary to improve the structure of the terminal connection portion according to the usage environment of the power receiving panel. .

nkt cable GmbH, product catalog, Sammelschienensystem 24 kV Busbar-System 24 kV, Edition 01.05.2007

  Ships such as escort ships are rapidly becoming hybrid power sources, and in recent years, it has been required to install a high-current power receiving panel.

  Electrical equipment used for such applications must pass the standards described in the Ministry of Defense standards. Specifically, it is necessary to have durability to withstand impacts such as when a ship is subjected to vibrations or external attacks. In particular, an excessive stress is applied to the terminal connection portion of the solid insulating bus due to vibration or impact, which may cause a connection failure and increase the voltage.

  In addition, the adjacent power receiving panels are displaced due to the heat generated by the power receiving panels, and the height of the floor of the ship on which the power receiving panels are mounted is displaced, so that the horizontal adapter penetrates each power receiving panel. The center axis of the hole will shift. As a result, an angular displacement occurs between the central axis of the through hole and the central axis of the solid insulation bus, causing a poor contact between the conductor portion of the solid insulation bus and the cross adapter connection conductor, and increasing the voltage at the termination connection. It becomes a factor to make.

  Further, there is a demand for a structure of a terminal connection portion that can easily replace only this portion if the solid insulating bus is damaged.

  The present invention has been made in view of these points, and an object of the present invention is to reduce the angular displacement between the central axis of the through hole of the cross adapter and the central axis of the solid insulation bus bar as compared with the conventional structure. An object of the present invention is to provide a solid insulated bus that can be exchanged by a simple method, and a termination connecting portion of the solid insulated bus.

In order to achieve the above-mentioned object, the terminal connection portion of the solid insulated bus according to the present invention is inserted into the opening, the insulated bus having a bus conductor having an opening formed at the end and an insulating layer covering the outer periphery. And a connecting conductor having a protruding portion protruding from an end of the insulating bus in a state where the inserting portion is inserted into the opening, and the inserting portion provided in a circumferential direction on an outer peripheral surface of the inserting portion. A solid insulation bus bar having a spring-like terminal that comes into contact with the inner peripheral surface of the opening in a state in which it is inserted into the opening, an adapter having through holes that cross each other in the horizontal and vertical directions, and the outer periphery of the adapter An insertion hole for inserting the solid insulation bus in at least a position corresponding to a horizontal through-hole of the adapter, and inserting the solid insulation bus Insert the hole into the hole Characterized by fixing the parts in the horizontal direction of the through hole of the adapter.

  Moreover, it is preferable to provide a space | gap part between the end surface of the said solid insulated bus, and the said molded object facing the said end surface inside the said insertion hole.

  In the above-described conventional example, since the connection between the bus conductor and the adapter is fixed by screwing using a stud bolt and a nut, the angular displacement between the adapter and the solid insulated bus, vibration, and impact are not affected. There is no mechanism to absorb. Therefore, it cannot be said that the conventional example has sufficient durability for vibration tests, impact tests, and the like, and there is a limit to long-term reliability against vibrations and shocks.

  On the other hand, the solid insulated bus according to the present invention includes an insulated bus having a bus conductor with an opening formed at an end, a connection conductor having an insertion portion inserted into the opening, and an outer peripheral surface of the insertion portion. Since the structure is provided with a spring-like terminal that is provided in a direction and contacts the inner peripheral surface of the opening in a state where the insertion portion is inserted into the opening, the force generated by external vibration or impact is a spring. It is absorbed by the deformation of the sex terminal. Thereby, even when an angular displacement occurs between the central axis of the through hole of the adapter and the central axis of the bus bar conductor, a good contact state can be maintained by the sliding deformation of the spring terminal.

  In addition, since the bus terminal conductor is clamped and fixed by the adapter, the terminal connection portion of the conventional example has a structure in which the solid insulation bus cannot be removed from the connection unless the bolt screwed into the stud bolt is loosened.

  On the other hand, in the present invention, only the connection conductor is fixed to the adapter, and the insulated bus is not fixed thereto. The connection conductor and the insulated bus have a structure in which a spring terminal provided on the outer peripheral surface of the insertion portion of the connection conductor is in contact with the inner peripheral surface of the opening of the bus conductor, and is not fixed. The connection conductor having the conductive terminal is left on the adapter side, and the connection conductor and the insulated bus can be easily separated. For this reason, it is possible to exchange an insulation bus bar by a simple method.

  According to the present invention, it is possible to reduce the angular displacement between the central axis of the through hole of the cross adapter and the central axis of the solid insulation bus bar as compared with the conventional structure, and replacement is possible by a simple method. A solid insulation bus and a termination connection for the solid insulation bus can be provided.

It is a fragmentary sectional view showing the insulated bus concerning one embodiment of the present invention. It is a fragmentary sectional view showing the solid insulation bus concerning one embodiment of the present invention. It is a fragmentary sectional view which shows the termination | terminus connection part of the solid insulated bus which concerns on one Embodiment of this invention. It is a fragmentary sectional view which shows the termination | terminus connection part of the solid insulated bus which concerns on other embodiment of this invention. It is a fragmentary sectional view which shows the termination | terminus connection part of the conventional solid insulated bus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a partial cross-sectional view of an insulated bus 5 used in an embodiment of the present invention. The insulated bus 5 includes a bus conductor 1 disposed at the center, an insulating layer 2 made of an insulator covering the outer periphery thereof, and a conductive layer 3 applied to the outer periphery of the insulating layer 2.

  Openings 21 are respectively formed at both ends of the bus conductor 1. The opening 21 is for accommodating an insertion portion 13 of a connection conductor 18 to be described later. The formation method of this opening part 21 is not specifically limited, For example, it can form by cutting.

  The material of the bus conductor 1 is not particularly limited, and may be any of copper, copper alloy, aluminum, and aluminum alloy, for example. Moreover, the shape is not limited, and the cross-sectional area corresponding to the current capacity may be round or square. Further, the structure of the bus conductor 1 is not particularly limited, and may be a hollow conductor having a through hole formed in the center or a solid conductor. In consideration of conductivity, the inner peripheral surface of the opening 21 is preferably covered with a noble metal plating such as silver plating.

  The material of the insulating layer 2 is not particularly limited. For example, a structure in which an outer peripheral surface of the bus bar conductor 1 is sandblasted and covered with an epoxy resin or the like can be employed. In addition, the conductive layer 3 has a structure in which an epoxy resin mixed with Ag filler is applied, a structure in which a metal coil is spirally wound around the outer periphery of the insulating layer 2, and a structure in which other metal materials are sputtered. Also good. In addition, the outer periphery of the conductive paint (conductive layer) 3 can be covered with the outer cover 4 as necessary. The outer cover 4 protects the insulating bus 5 from damage, and the material is not particularly limited as long as it is used, but it is preferable to use, for example, cross-linked polyethylene. The method of forming the outer cover 4 may be an extrusion method, or may be a method using a heat shrinkable tube that shrinks when heated.

  FIG. 2 is a partial cross-sectional view of the solid insulating bus 50 according to the present embodiment.

  The connection conductor 18 includes an insertion portion 13 that is inserted into the opening 21 formed at both ends of the bus conductor 1, a protrusion 14 that protrudes from the end of the insulated bus 5, and the insertion portion 13 and the protrusion 14. And a central portion 15 connecting the two. The insertion part 13, the projecting part 14, and the central part 15 are integrally formed members, and the material thereof is not particularly limited. For example, copper, aluminum, or the like can be used. In consideration of conductivity, a configuration in which a noble metal such as silver plating is plated is preferable.

  Two annular grooves 16 are formed in the circumferential direction on the outer peripheral surface of the insertion portion 13, and spring terminals 17 are wound around the annular grooves 16. The shape of the spring terminal 17 is not particularly limited as long as it is a structure that elastically contacts the outer peripheral surface of the insertion portion 13 and the inner peripheral surface of the opening portion 21 by spring elasticity. A continuous structure in which a louver portion in which a copper material is silver-plated can be adopted for each of a plurality of openings formed in a long carrier made of Further, the spring-like terminal 17 is not limited to the two-row configuration, and may be a single-row configuration when the number of contact points may be small, or may be a three-row configuration as necessary.

  The solid insulated bus 50 of this embodiment is wound around the outer peripheral surface (annular groove 16) of the insertion portion 13 by accommodating the insertion portions 13 of the connection conductors 18 in the openings 21 formed at both ends of the bus conductor 1, respectively. The formed spring terminal 17 and the inner peripheral surface of the opening 21 are in elastic contact with each other, and the protruding portion 14 of the connecting conductor 18 protrudes from both ends of the insulating bus 5. With such a configuration, force generated by external vibration or impact is absorbed by deformation of the spring-like terminal 17, and an angle is formed between the center axis of the through hole of the adapter 11 described later and the center axis of the bus bar conductor 1. Even if displacement occurs, a good contact state can be maintained.

  FIG. 3 shows a partial cross-sectional view of the termination connecting portion 60 of the solid insulated bus according to the embodiment of the present invention. The terminal connection portion 60 mainly covers the insulation bus 5, the connection conductor 18, the stud bolt 7, the nut 8, the insulation plug 9, the shielding cap 10, the adapter 11, the bushing side conductor 12, and the outer periphery thereof. A bushing side mold 26 and a mold (hereinafter referred to as a molded body) 19 are provided.

  As the adapter 11, a cross adapter connection conductor 11 in which through holes intersecting each other in the horizontal direction and the vertical direction can be used. The molded body 19 that covers the outer periphery of the cross adapter connection conductor 11 is also formed with through holes that cross each other in the horizontal direction and the vertical direction so as to be aligned with the positions of the through holes of the cross adapter connection conductor 11.

  The horizontal through-hole of the molded body 19 functions as an insertion hole for inserting the solid insulating bus 50. In the vertical through hole of the molded body 19, the lower through hole functions as an insertion hole for inserting the bushing-side conductor 12, and the upper through hole functions as an insertion hole for inserting the stud bolt 7.

  The stud bolt 7 is inserted into the cross adapter connection conductor 11 and the vertical through-hole of the molded body 19 from the upper side, and the bushing-side conductor 12 is inserted from the lower side, and the stud bolt 7 and the recess of the bushing-side conductor 12 are inserted. (Screw holes) are screwed together.

  Solid insulation buses 50 are respectively inserted into the horizontal through holes of the molded body 19 from both sides so that the protruding portions 14 of the connection conductors 18 face each other in the horizontal through holes of the cross adapter connection conductor 11. Insert each one. The cross adapter connection conductor 11 has a two-divided structure that is divided in the vertical direction. By screwing a nut 8 to the stud bolt 7, the protruding portion 14 is sandwiched between the cross adapter connection conductors 11 of the two-divided structure. Fixed.

  The protruding portion 14 of the connection conductor 18 is fixed to the cross adapter connection conductor 11, while the insulated bus 5 is not fixed to the cross adapter connection conductor 11, and the connection conductor 18 contacts the opening 21 of the bus conductor 1. It is a structure to do. Thereby, it becomes possible to leave the connection conductor 18 on the cross adapter connection conductor 11 side and to easily remove the insulation bus 5 from them, and the insulation bus 5 can be exchanged by a simple method.

  An insulating plug 9 is disposed in the upper through hole of the molded body 19, and the top thereof is covered with a shielding cap 10.

  For the stud bolt 7, nut 8, insulating plug 9, shielding cap 10, cross adapter connection conductor 11, bushing-side conductor 12, and molded body 19, known components that are widely used can be used.

  The material of the cross adapter connection conductor 11 and the bushing side conductor 12 is not particularly limited. For example, copper or aluminum can be used as long as it is a conductive material.

  The molded body 19 is a resin molded body having a three-layer integrated structure, and includes an internal semiconductive layer 20, an insulating layer 22, and an external semiconductive layer 23. The material of the molded body 19 is not particularly limited, but it is preferable to use a rubber material in consideration of the ease of removal of the insulating bus 5, and for example, EP rubber can be used.

  Further, it is preferable to form a gap 40 between the end of the solid insulating bus 50 and the molded body 19. By forming the gap 40, the gap 40 can absorb a dimensional error portion in the longitudinal direction of the solid insulating bus 50 and a portion expanded due to a thermal effect during energization.

  FIG. 4 shows a partial cross-sectional view of the terminal connection portion 70 of the solid insulated bus according to another embodiment of the present invention. This terminal connection portion 70 is different from the structure of the terminal connection portion 60 shown in FIG. 3 in that the solid insulation bus 50 is inserted only from one side. Specifically, an end adapter connection structure is adopted as the adapter, and the spacer conductor 25 is disposed in one of the horizontal through holes of the end adapter connection conductor 24, so that the end connection portion 60 of FIG. It is different from the structure. Even in such an end adapter connection structure, it is possible to achieve the same operational effects as those of the end connection portion 60 of FIG. In addition, the well-known components used widely can be used for the spacer conductor 25. FIG.

  Examples of the present invention will be described below. An insulating layer made of an epoxy resin having a thickness of 10 mm is formed on a hollow conductor made of copper having a diameter of 32 mm and a through hole having a diameter of 20 mm in the center, and a conductive paint is applied thereon to form a conductive layer. An insulation bus bar having a diameter of 58 mm was prepared by covering the outer cover using a heat shrinkable tube. The length of this insulating bus was 360 mm. As the conductive paint, a conductive material (trade name: Doutite D-435, Fujikura Kasei Co., Ltd.) in which an Ag filler is added to an epoxy resin was used. An opening having a diameter of 25 mm was formed in the hollow conductor exposed from both ends of the insulating bus bar by cutting.

  The connecting conductor has a length of 84.5 mm, the insertion portion has a length of 45 mm, the protruding portion has a length of 33.5 mm, and the central portion has a length of 6 mm. The insertion part has a diameter of 24 mm, the protruding part has a diameter of 20 mm, and the central part has a diameter of 32 mm. Two annular grooves were formed in the circumferential direction of the insertion portion, and a multi-ram band (MC-Multilam, LA-CUD / 0.15, Multi Contact) was wound around each groove. Two connecting conductors having such a structure were prepared.

  Solid insulation buses were produced by accommodating the insertion portions of the connection conductors in the openings formed at both ends of the above-described insulation buses.

  An outer frame having a length of 70 cm, a width of 60 cm, and a height of 70 cm is installed on the base plate, and a base having an opening for fixing the terminal connection portions of the two solid insulating buses is installed on the upper surface of the outer frame. The end adapter connection structure shown in FIG. 4 was provided in each of the openings provided in FIG.

  Specifically, both ends of one solid insulated bus having connection conductors attached to both ends were inserted into through holes of two end adapter connection conductors installed at a predetermined interval. Then, stud bolts were inserted into the vertical through-holes and screwed into the bushing side conductors, the connection conductors were sandwiched through the end adapter connection conductors having a two-part structure, and hexagon nuts were screwed together to fix them. Further, the above-mentioned bushing side conductors were each electrically connected to the lead-out cable. In this way, a sample was prepared.

  Vibration test: The test was conducted in accordance with the Ministry of Defense standard (NDS XF 8017). In order to check the state of the device before applying vibration, a withstand voltage test and a partial discharge test were performed.

  (1) Variable frequency vibration test: Vibrations having amplitudes shown in Table 1 were applied from the X-axis direction, the Y-axis direction, and the Z-axis direction at a frequency of 5 Hz to 33 Hz.

  The time for applying vibration was 5 minutes / Hz for each frequency and each axis, and the vibration was applied for approximately equal time in the two states of “energized” and “no-energized” of the solid insulated bus and the end adapter. The applied voltage was set to 450 V AC, and the voltage between the ends of the two drawing cables was measured to confirm that there was no abnormality.

  (2) Vibration endurance test: A vibration with an amplitude of 0.25 mm was applied at a frequency of 5 Hz to 33 Hz, the device was in a non-energized state, and the vibration was applied for about 15 seconds / Hz to obtain the resonance frequency. The resonance frequencies obtained here were each added for 20 minutes for a total of two hours in the X-axis direction, the Y-axis direction, the Z-axis direction, and the energized state and the non-energized state. When resonance was not observed, vibration was performed at 33 Hz. The applied voltage was confirmed as AC450V and there was no abnormality.

  Further, in the above tests (1) and (2), it was confirmed whether there was any abnormality in the appearance of the sample.

  Impact test: The test was conducted in accordance with the Ministry of Defense standard (NDS F 8005B HI1A). In order to check the state of the device before applying the impact, a withstand voltage test and a partial discharge test were performed. Three types of tests were carried out by attaching the above-mentioned sample to the anvil plate and changing the height of the lateral hammer with a total weight of 180 kg to 30 cm, 90 cm and 15 cm in each of the X-axis direction, Y-axis direction and Z-axis direction. The impact was given to the sample by striking the impact on the anvil plate. The voltage between the cable ends was measured in an AC450V energization state.

  The samples using the examples of the present invention were confirmed to have no abnormality in voltage and appearance in both vibration test and impact test. In the examples, the force generated by external impacts and vibrations was absorbed by the multi-ram band, and thus no abnormalities such as a voltage rise and abnormal appearance were observed after such a test.

1 Bus Bar Conductor 2 Insulating Layer 5 Insulated Bus 7 Stud Bolt 8 Nut 11 Cross Adapter Connection Conductor (Adapter)
DESCRIPTION OF SYMBOLS 12 Bushing side conductor 13 Insertion part 14 Protrusion part 16 Annular groove 17 Spring-like terminal 19 Forming body 18 Connection conductor 21 Opening part 50 Solid insulation bus 60 Termination connection part

Claims (2)

An insulating bus having a bus conductor having an opening formed at an end and an insulating layer covering an outer periphery; an insertion portion inserted into the opening; and the insulating bus in a state where the insertion portion is inserted into the opening. A connecting conductor having a projecting portion projecting from an end portion, and a spring provided in a circumferential direction on the outer peripheral surface of the insertion portion and in contact with the inner peripheral surface of the opening portion in a state where the insertion portion is inserted into the opening portion A solid insulated bus with a conductive terminal;
An adapter having through holes that intersect each other in the horizontal direction and in the vertical direction;
A molded body covering the outer periphery of the adapter,
In the molded body, an insertion hole for inserting the solid insulation bus bar is formed at a position corresponding to at least a horizontal through hole of the adapter,
A solid insulation bus termination connection portion, wherein the solid insulation bus is inserted into the insertion hole, and the protrusion is fixed to a horizontal through hole of the adapter. 2. The terminal connection portion of a solid insulation bus according to claim 1 , wherein a gap is provided between an end face of the solid insulation bus and the molded body facing the end face inside the insertion hole.