JP2009099682A - Transformer for gas insulated meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a transformer for a gas insulated meter which is easily adjusted upon assembling. <P>SOLUTION: The transformer for the gas insulated meter includes a tank 1 which is sealed and filled with insulating gas, a voltage transforming element 2 having a primary coil and a secondary coil, three-phase high-voltage conductors 12, movable contact terminals (high-voltage terminal) 13 connected to the respective phases of one of the primary coil and high-voltage conductor, a fixed contact terminal (high-voltage side end) 8 connected to the respective phases of the other and disposed opposite to the movable contact 13, a Y-shaped insulating rod 16 supporting the movable contacts 13 of the three phases together movably, and an operating rod 14 allowing the fixed contact 8 and movable contacts 13 to come in contact and separate by moving the Y-shaped insulating rod 16 from outside the tank, wherein one of the Y-shaped insulating rod 16 and operating rod 14 is provided with a swing structure 19 allowing the movable contact 13 to swing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  According to the present invention, a voltage converting element having a primary coil and a secondary coil, and a connecting / disconnecting operation unit for connecting / disconnecting the voltage converting element to / from a high voltage circuit in a tank filled with an insulating gas. The present invention relates to a gas insulated instrument transformer to be housed.

  In power facilities such as power plants and substations, higher voltages are being promoted in recent years. In such a power facility, an improvement in the insulation performance of the electrical device is a major issue from the viewpoint of preventing an insulation failure of the electrical device and ensuring a stable supply of power. For this reason, in recent years, instead of the conventional air-insulation method using atmospheric pressure air, gas-insulated electrical equipment that has been insulated with an insulating gas having excellent insulation performance has been increasingly used. Of the amount of electricity flowing through a high-voltage circuit such as a power system circuit equipped with such gas-insulated electrical equipment, instrument transformers used for measuring high-voltage electrical quantities are also for gas-insulated instruments that employ gas insulation. Transformers are being used.

  In such a transformer for gas insulated instruments, generally, a primary high voltage coil is always connected to a high voltage circuit, voltage transformation is performed, and a secondary low voltage coil performs high voltage measurement. However, when conducting a voltage test such as a DC and AC insulation test for high-voltage circuit power equipment, such as a gas-insulated switchgear, the gas-insulated instrument transformer is a high voltage to prevent failure due to the invasion of overvoltage. Must be electrically disconnected from the circuit. In other words, the gas insulated instrument transformer is configured to have a function of performing an electrical disconnection operation and a connection operation as necessary for a high voltage circuit (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2003-7553, page 4, FIG.

  A conventional gas insulated instrument transformer as described in Patent Document 1 has three phase voltage transformation elements housed in a tank filled with an insulating gas, and the high voltage side of these high voltage transformation elements. The end (fixed contact) and the high-voltage terminal (movable contact) of the high-voltage conductor connected to the insulating spacer attached to the opening of the tank face each other. A Y-shaped insulating rod is connected to these opposing high-voltage terminals (movable contacts), and an operation rod for moving the movable part from the outside of the tank is coupled to this Y-shaped insulating rod to connect and disconnect from the high voltage circuit. Has been done.

  In the gas-insulated instrument transformer having such a configuration, the high-voltage terminal and the high-voltage side end must be accurately positioned. That is, the high-voltage terminal and the high-voltage side end of each phase must be at the same position on the surface orthogonal to the contact / separation direction of the high-voltage terminal and the high-voltage side end. Moreover, in the contact / separation direction of the high-voltage terminal and the high-voltage side end, the high-voltage terminal of each phase and the high-voltage side end of each phase must be the same height. Therefore, conventionally, it has been necessary to use parts processed with high accuracy.

  The present invention has been made to solve the above-mentioned problems, and is simple in construction and can be manufactured at low cost, and can be easily adjusted at the time of assembly, and connected to and disconnected from the high voltage circuit of the gas insulated switchgear. It is possible to obtain a gas insulated instrument transformer that can reliably perform the above.

  In order to solve the above-mentioned problems and achieve the object, a transformer for gas insulated instrument according to the present invention is sealed by an insulating spacer, filled with an insulating gas, accommodated in the tank, and wound around an iron core. A voltage transforming element having a primary coil and a secondary coil, a three-phase high-voltage conductor supported by an insulating spacer and extending into the tank, and each phase of either the primary coil or the high-voltage conductor in the tank A movable contact terminal (high-voltage terminal) connected to each other, a fixed contact terminal (high-voltage side end) connected to each of the other phases of the primary coil and the high-voltage conductor and opposed to the movable contact, and three An insulating rod that supports the movable contacts of the phase in a movable manner and one end connected to the insulating rod and the other end extending to the outside of the tank. And an operating rod contacting and separating the contacts, to at least one of the insulating rod and the operating rod, characterized in that a rocking structure to allow rocking of the movable contact.

  According to the gas insulated instrument transformer of the present invention, at least one of the insulating rod and the operating rod is provided with the swinging structure that allows the movable contactor (high-voltage terminal) to swing. The tip of the contactor (high-voltage terminal) can move in the direction perpendicular to the contact / separation direction and in the contact / separation direction. When contacting the fixed contact terminal (high voltage side end), Because it moves and absorbs the difference in dimensions, accurate positioning is not necessary, and there is no need to adjust the dimension between the movable contact and the fixed contact during assembly, so there is no need to process parts with high precision. There is an effect that the cost can be reduced. Furthermore, since each of the three-phase movable contacts comes into contact with a predetermined contact pressure in balance, there is an effect that the connection / disconnection operation can be performed appropriately.

  When the movable contact terminal is provided on the high voltage conductor side, the high voltage terminal is the movable contact terminal, the fixed contact terminal is the high voltage side end, and conversely, the movable contact terminal is provided on the primary coil side. In this case, the movable contact terminal becomes the high voltage side end, and the fixed contact terminal becomes the high voltage terminal.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a gas insulated instrument transformer according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
1 is a front view showing a part of a first embodiment of a transformer for gas insulated instrument according to the present invention as a cross section, and is a cross-sectional view taken along line BB in FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is an enlarged view of the connecting / disconnecting portion C (for one phase) indicated by a one-dot chain line in FIG.

  1 and 2, a tank 1 is formed of a ground metal, and a voltage converting element 2 is accommodated therein. The voltage transformation element 2 includes a frame-shaped iron core 4 fixed on the bottom plate 3 of the tank 1, a low-voltage coil 5 wound around a yoke portion 4a of the iron core 4, and a coaxial shape with the low-voltage coil 5 outside thereof. And the high-voltage coil 6 wound around. An insulating gas 21 such as sulfur hexafluoride gas is sealed in the tank 1 in a pressurized state. The high voltage coil 6 is provided with a high voltage shield 7 for relaxing the electric field between the high voltage side and the ground side, and a high voltage side end (fixed contact) 8 protrudes above the high voltage shield 7.

  The tank 1 has an opening 9 at the upper end, and a three-phase insulating spacer 10 that closes the opening 9 in an airtight manner is attached to the opening 9. The three-phase insulating spacer 10 has a three-phase through conductor 11 having an outer end 11a connected to a high voltage circuit (not shown) outside the tank 1 and an inner end 11b introduced into the tank. The high-voltage conductors 12 are connected to the tip ends of the inner end portions 11 b that penetrate through the tank 1 and protrude into the tank 1.

  A high-voltage terminal (movable contact) 13 is fitted to the ends of these high-voltage conductors 12 so as to be movable up and down, and faces the high-voltage side end (fixed contact) 8 of the voltage transformation element 2, respectively. Has been placed. Thereby, when each high voltage terminal (movable contact) 13 moves in the vertical direction of FIG. 1, the high voltage terminal (fixed contact) 8 of each voltage transforming element 2 is contacted and separated.

  An operation rod 14 is provided through the bottom plate 3 of the tank 1 so as to be able to enter and exit. The operation rod 14 can be moved in and out by an operation device 15 provided on the back surface of the bottom plate 3. A Y-shaped insulating rod 16 that is radially branched at an equal angle is coupled to the operation rod 14. The high-voltage terminals (movable contacts) 13 described above are connected to the respective tips of the Y-shaped insulating rods 16 so that the operation of the operation rod 14 is transmitted to the high-voltage terminals (movable contacts) 13. By moving in the vertical direction in FIG. 1, the connection / disconnection operation to / from the high voltage side end (fixed contact) 8 of each voltage transforming element 2 is performed.

  Next, details of the high-voltage terminal (movable contact) 13 and the high-voltage side end (fixed contact) 8 will be described with reference to FIG. A high-voltage conductor 12 extending from a through conductor 11 (FIG. 1) that penetrates the insulating spacer 10 is connected to a conductor 12a, and a high-voltage terminal (movable contact) 13 is slid to the conductor 12a via a slider 18. It is movably supported and electrically connected. A hole 13 a into which the tip of the Y-shaped insulating rod 16 is inserted is formed in the side wall of the high-voltage terminal 13, and a hard rubber (elastic member) 19 is inserted into the gap between the hole 13 a and the end of the Y-shaped insulating rod 16. Has been.

  Next, the operation will be described. For convenience, the upper and lower sides of FIGS. 1 and 3 will be described as upper and lower for convenience, but the present invention is not limited to this. When conducting a power application test such as a direct current and alternating current insulation test of a power system device, for example, a gas insulated switchgear, the operating rod 14 is raised by an operating device 15 provided outside the tank 1 as shown in FIG. As a result, the high-voltage terminals (movable contacts) 13 connected to the Y-shaped insulating rod 16 together with the Y-shaped insulating rod 16 connected to the operation rod 14 are also raised, and the high-voltage side end ( The fixed contact) 8 and the three-phase contact are released simultaneously, and the voltage transformation element 2 is disconnected from the high voltage circuit. This disconnection operation can prevent a failure of the gas insulation instrument transformer due to the entry of an overvoltage.

  On the other hand, during normal operation of the insulated instrument transformer, the operating rod 14 is lowered by the operating device 15 provided outside the tank 1, thereby being connected to the insulating rod together with the Y-shaped insulating rod 16 connected to the operating rod 14. Each high-voltage terminal (movable contact) 13 descends and contacts the high-voltage side end (fixed contact) 8 of the voltage transformation element 2 at the same time in three phases. As a result, a conductive path of the through conductor 11 -the high voltage conductor 12 -the high voltage terminal 13 -the high voltage side end 8 -the high voltage shield 7 for electric field relaxation -the high voltage coil 6 is formed, and the voltage transformation element 2 performs high voltage measurement. Can do.

  At this time, since the hard rubber (elastic member) 19 is provided as a swinging structure that allows swinging at the support portion of the high-voltage terminal 13 of the Y-shaped insulating rod 16, the tip of the high-voltage terminal 13 is in the contact / separation direction. It is possible to move in the direction perpendicular to the direction and the direction of contact and separation, and when contacting the high voltage side end (fixed contact) 8, it moves in a predetermined direction and absorbs the difference in dimensions. Accurate positioning is not required, and it is not necessary to process parts with high precision as in the prior art, and costs can be reduced. Furthermore, since the three-phase high-voltage terminals (movable contacts) 13 come in contact with a predetermined contact pressure in a balanced manner, connection / disconnection operations can be performed appropriately.

  In the present embodiment, the hard rubber 19 is used as an elastic member for supporting the high-voltage terminal (movable contact) 13, but not only the hard rubber 19 but also an elastic body such as a spring may be used.

Embodiment 2. FIG.
FIG. 4: is a front view which shows a part of Embodiment 2 of the transformer for gas insulation instruments concerning this invention as a cross section. FIG. 5 is an enlarged view of the connecting / disconnecting portion D (for one phase) indicated by a one-dot chain line in FIG. In the present embodiment, a universal joint (flexible member) 20 is provided on the operation device 15 side of the intermediate portion of the operation rod 14. The universal joint 20 is provided so that the operation rod 14 bends so that the Y-shaped insulating rod 16 can swing with respect to the tank 1. That is, the universal joint 20 constitutes a swinging structure that allows the Y-shaped insulating rod 16 to swing by being provided on the operating rod 14 and making the operating rod 14 flexible.

  As shown in FIG. 5, the high-voltage terminal (movable contact) 13 is fixed by directly fixing the tip of the Y-shaped insulating rod 16 to the hole 13a as in the conventional case. Other configurations are the same as those of the first embodiment.

  In the gas insulated instrument transformer of the present embodiment, since the operating rod 14 is provided with a swinging structure that allows the Y-shaped insulating rod 16 to swing, a Y-shaped insulation is provided. By swinging the rod 16, the tip of the high-voltage terminal 13 can be moved in the direction perpendicular to the contact / separation direction and in the contact / separation direction, and comes into contact with the high voltage side end (fixed contact) 8. At this time, since the difference in dimensions is absorbed by moving in a predetermined direction, accurate positioning is not required, and it is not necessary to process the parts with high accuracy as in the conventional case, and the cost can be reduced. Furthermore, since the Y-shaped insulating rod 16 swings, the three-phase high-voltage terminals 13 balance each other at a predetermined position, so that the contact pressures of the high-voltage terminals 13 are equalized, and the connection / disconnection operation is performed. Can be performed appropriately.

  In the present embodiment, the universal joint 20 is used as a flexible member that gives the operation rod 14 flexibility. However, the universal joint 20 is not limited to the universal joint 20 and may be an elastic body such as hard rubber. May be.

Embodiment 3 FIG.
The gas insulated instrument transformer of the present embodiment has a structure having both the swing structure of the first embodiment and the swing structure of the second embodiment. That is, as shown in FIG. 3, a hard rubber (elastic member) 19 is provided on the support portion of the high-voltage terminal 13 of the Y-shaped insulating rod 16 as a swinging structure that allows swinging. As shown in FIG. 4, a universal joint (flexible member) is provided as a swinging structure that is provided on the operating rod 14 and allows the swinging of the Y-shaped insulating rod 16 by giving the operating rod 14 flexibility. ) 20 is provided.

  In the gas insulated instrument transformer of the present embodiment, due to the synergistic effect of the hard rubber (elastic member) 19 and the universal joint (flexible member) 20, the movable amount and the movable degree of freedom of the tip of the high-voltage terminal 13. Becomes larger, and the difference in dimensions can be absorbed more greatly. In addition, since the three-phase high-voltage terminals 13 are balanced with each other so as to be able to swing to a predetermined position, the contact state of the high-voltage terminals 13 becomes more appropriate, the contact pressure becomes even more uniform, and the connection / disconnection is performed. The operation can be performed more appropriately.

  The gas insulated instrument transformer of the present invention is suitable for use in a gas insulated instrument transformer used for voltage measurement of a high voltage circuit.

It is a front view which shows a part of Embodiment 1 of the transformer for gas insulation instruments concerning this invention as a cross section, and is arrow sectional drawing in alignment with the BB line of FIG. It is arrow sectional drawing which follows the AA line of FIG. FIG. 2 is an enlarged view of a connecting / disconnecting portion C (for one phase) indicated by a one-dot chain line in FIG. 1. It is a front view which shows a part of Embodiment 2 of the transformer for gas insulation instruments concerning this invention as a cross section. FIG. 5 is an enlarged view of a connection / disconnection portion D (for one phase) indicated by a one-dot chain line in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tank 2 Voltage transformation element 4 Iron core 5 Low voltage coil 6 High voltage coil 7 High voltage shield 8 High voltage side edge (fixed contact)
10 Insulating spacer 11 Through conductor 12 High voltage conductor 13 High voltage terminal (movable contact)
14 Operation rod 16 Y-shaped insulation rod (insulation rod)
19 Hard rubber (elastic member: swing structure)
20 Universal joint (flexible member: swing structure)
21 Insulating gas

Claims (7)

A tank sealed by an insulating spacer and filled with an insulating gas;
A voltage converting element housed in the tank and having a primary coil and a secondary coil wound around an iron core;
A three-phase high-voltage conductor supported by the insulating spacer and extending into the tank;
In the tank, a movable contact terminal connected to each phase of either the primary coil or the high-voltage conductor,
A fixed contact terminal connected to each of the other phases of the primary coil and the high-voltage conductor, and arranged to face the movable contact;
An insulating rod that supports the movable contacts of the three phases in a movable manner, and
One end is connected to the insulating rod, and the other end extends to the outside of the tank. ,
A gas insulated instrument transformer, wherein at least one of the insulating rod and the operating rod is provided with a swing structure that allows the movable contact to swing.   2. The gas insulated instrument transformer according to claim 1, wherein the swing structure is an elastic member provided at a support portion of the movable contact of the insulating rod. The said rocking | fluctuation structure is a flexible member which accept | permits the rocking | fluctuation of the said insulation rod by providing the said operating rod with the said operating rod and giving flexibility. Gas insulation instrument transformer. The swing structure swings the insulating rod by providing an elastic member provided on a support portion of the movable contact of the insulating rod and providing the operating rod with flexibility by providing the operating rod. The gas-insulated instrument transformer according to claim 1, wherein the transformer is a flexible member that permits the following. The gas insulated instrument transformer according to claim 3 or 4, wherein the insulating rod is a Y-shaped insulating rod that is supported at a central portion and extends in a direction orthogonal to the contact / separation direction. The gas insulation meter transformer according to claim 2 or 4, wherein the elastic member is rubber. The gas insulation instrument transformer according to claim 3 or 4, wherein the flexible member is a universal joint.

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