JP4710663B2 - Polyphase switch - Google Patents

Description

  The present invention relates to a transformer for a gas insulated instrument provided with a disconnecting means capable of being connected to and disconnected from a high voltage circuit.

  A transformer for gas insulated instruments (hereinafter referred to as “gas VT”) is connected to a gas insulated switchgear (hereinafter referred to as “GIS”) for voltage transformation of a high voltage circuit. It is necessary to disconnect from the high voltage circuit during a withstand voltage test. For this reason, the gas VT needs to be provided with a disconnecting means for connecting to or disconnecting from the high voltage circuit.

  The gas VT provided with the conventional disconnection means is demonstrated using FIG. 1, 2 (patent document 1). FIG. 1 is a side view showing the internal structure of a conventional gas VT, and FIG. 2 is a cross-sectional view of the conventional gas VT shown in FIG. High voltage terminals 8 are provided at the ends of the high voltage conductors 4 introduced into the container 1 filled with the insulating gas, and these high voltage terminals 8 are connected to the connection conductors 9 of the high voltage side end 7 of the voltage modifying element 2, respectively. It is arrange | positioned facing. By connecting the connecting conductor 9 with the insulating rod 11 airtightly introduced into the container 1 from the operating device 10 located outside the bottom plate of the container 1, the insulating rod 11 is moved in the vertical direction from the outside of the container 1, The connection conductor 9 and the high-voltage terminal 8 are connected and disconnected.

JP 2002-313653 A

  In the gas VT provided with the conventional disconnection means described in Patent Document 1 above, the high-pressure side end 7 and the high-pressure terminal 8 are positioned above the container 1, and the operating device 10 is located outside the bottom of the container 1. Is located. For this reason, the operating device 10 is far away from the high-voltage terminal 8, and the insulating rod 11 that transmits the operating force from the operating device 10 to the high-voltage terminal 8 side is lengthened. In addition, since the insulating rods 11 are disposed between the phases of the three-phase voltage transforming element 2, a sufficient insulation distance must be secured, leading to an increase in size and weight of the container 1.

  Further, when the gas VT is mounted horizontally with respect to the GIS, since there is a distance L from the operating device 10 to the connection conductor 9, the connection conductor 9 and the insulation rod 11 are connected to the airtight introduction portion 11 </ b> C at the bottom of the container 1 of the insulation rod 11. When a moment arm force of its own weight × distance L is applied, and the insulating rod 11 that is not deformed by the force is designed, the diameter of the insulating rod 11 is increased, and the operating device 10 is also increased in size, leading to an increase in cost.

  The present invention has been made to achieve the above object, and a plurality of high-voltage terminals connected to the high-voltage conductors of each phase of the polyphase alternating current, the high-voltage terminals arranged opposite to each of the high-voltage terminals, and A plurality of voltage transformation elements, an insulation frame having a plurality of movable connection conductors for connecting each high voltage terminal and each high voltage connection terminal between the high voltage terminal and the high voltage connection terminal, and the insulation frame in the circumferential direction. There is provided a gas insulated instrument transformer including a driving unit that rotates to bring each movable connecting conductor into contact with or separate from each high voltage terminal and each high voltage connecting terminal.

  In addition, the gas insulated instrument transformer according to the present invention has a gear ring having a gear attached to the insulating frame, and the drive unit transmits power to the gear ring to rotate the insulating frame in the circumferential direction. It is possible.

  The gas VT provided with the disconnecting means according to the present invention uses an insulating frame instead of the insulating rod 11 as a support portion of the connecting conductor, and there is no need to consider the insulating distance between the insulating rod 11 and the insulating element. The diameter can be reduced.

  Further, the moment force applied to the insulating frame as the support portion does not increase even when the gas VT is horizontally mounted on the GIS. For this reason, the gas VT according to the present invention is suitable for horizontal mounting on the GIS. Further, since the insulating frame is supported by the container at a plurality of locations, the gas VT according to the present invention reliably and smoothly performs the contact / separation operation of the high voltage circuit and the voltage transforming element in any mounting direction with respect to the gas VT. It is possible.

  Furthermore, since the high voltage circuit and the voltage transforming element can be easily connected or disconnected by rotating the insulating frame, the operation device can be arranged on the side of the gas VT instead of the bottom of the gas VT. The installation area can be reduced by reducing the diameter, or the operability of the gas VT can be improved.

  Hereinafter, the Example of gas VT provided with the disconnection means based on this invention is described with reference to FIGS.

  The disconnecting means-equipped gas VT20, which is an embodiment of the present invention, will be described with reference to the drawings. FIG. 3 is a side view of the internal structure of the gas VT20 with disconnect means in a state where the high voltage circuit and the voltage transformation element are connected (hereinafter referred to as “on state”).

Although the gas VT with disconnect means according to the present invention is for a multi-phase AC transformer, an example of a three-phase AC transformer will be described below. In the case of three-phase alternating current, the three-phase high-voltage conductors 22 from the GIS are connected to the insulating spacer 21, and the insulating spacer 21 is airtightly connected to the container 33. Then, in the container 33, the insulating gas such as SF ₆ is filled. In the container 33, a high voltage terminal 23 is attached to the tip of the high voltage conductor 22. The high-voltage terminal 23 is provided with a spring (not shown). The high-voltage terminal 23 moves up and down, and the contact pressure with the connection conductor 24 connected to the high-voltage terminal 23 is held by the force of the spring.

  The connection conductor 24 has three phases, and is arranged so as to be in contact with the high voltage terminal 23 of each phase in the ON state shown in FIG. The connection conductor 24 is attached to the insulating frame 25. The insulating frame 25 is attached to a rotating gear ring 26, and the gear ring 26 is held and connected to an operation device 28 installed on the outside of the container 33 by a gear (not shown).

  In the ON state shown in FIG. 3, the connection conductor 24 is connected to the high-voltage terminal 23 at the same time as being connected to the high-voltage terminal 23. The high-voltage side end 30 is provided with a spring (not shown) like the high-voltage terminal 23, moves up and down, and contacts with the connection conductor 24 connected to the high-voltage side end 30 by the force of the spring. Holds pressure.

  The high voltage conductor 22 is connected to the high voltage side end 30 via the connection conductor 24, whereby the high voltage coil 29a is connected to the high voltage circuit. There are three voltage transformation elements, each of which is composed of a high voltage coil 29a, a low voltage coil 29b, and an iron core 29c. Each voltage transforming element has a configuration in which a low voltage coil 29b is wound on an iron core 29c and a high voltage coil 29a is wound on the outside thereof. An induced electromotive force is generated in the low voltage coil 29b due to a change in magnetic flux generated in the iron core 29c due to a high voltage current flowing in the high voltage coil. In this way, the high voltage of the high voltage coil 29a is transformed in the low voltage coil 29b.

  FIG. 4 is a cross-sectional view of the gas VT with the disconnecting means in the ON state taken along the line AA shown in FIG. The insulating frame 25 is attached to the gear ring 26 and further supported rotatably by a guide roller 27 fixed in the container 33. As described above, the disconnecting means-equipped gas VT20 according to the present invention supports the connection conductor 24 via the insulating frame by the plurality of guide rollers 27. Furthermore, the voltage transformation element is installed independently on the container 33 and does not have a form of hanging on the connection conductor 24. For this reason, an excessive moment force is not applied to a part of the insulating frame 25.

  Further, the connection conductors 24 for three phases are arranged at the periphery of the insulating frame 25 formed in a ring shape so as to face the high voltage terminal 23. In the present embodiment, the case of three-phase alternating current will be described, but the connection conductor 24 for each phase is arranged in the peripheral portion of the insulating frame 25 also in the case of other multiphases.

  Switching from the on state shown in FIG. 3 and FIG. 4 to a state in which the high voltage circuit and the voltage transforming element are separated (hereinafter referred to as an off state) causes the gear ring 26 connected to the insulating frame 25 to rotate counterclockwise. The connection conductor 24 of each phase attached to the insulating frame 25 is rotated and separated from the high-voltage terminal 23 and the high-voltage side end 30 of each phase. In the power transmission of the rotation operation of the gear ring 26, the rotation speed of the operation handle 31 is converted in the gear box 32. In addition, when the rotation axis needs to be converted, the rotation axis of the rotation operation is converted using the operation device 28.

  FIG. 5 shows a gear ring 26 according to an embodiment of the present invention, and the above-described gear ring rotation operation will be described in more detail. Rotational power from a gear box (not shown) 32 is converted to a rotational axis direction using a bevel gear (not shown) or a bevel gear (not shown) in the operation device 28 and transmitted to the gear 35. . Teeth are provided outside the gear ring 26, whereby the power of the gear 35 is transmitted to the gear ring 26. In FIG. 5, in order to explain the power transmission mechanism of the gear 35 and the gear ring 26, they are shown relatively large with respect to the insulating frame 25 (the connection conductor 24 is not shown). Actually, it is small as shown in FIGS.

  FIG. 6 is a side view of the internal structure of the gas VT20 with disconnect means in the off state. When the operation handle 31 is turned counterclockwise from the on state shown in FIG. 4, the gear ring 26 rotates counterclockwise through the operation device 28. Since the insulating frame 25 rotates in accordance with the rotation of the gear ring 26, each connection conductor 24 also rotates, and the connection conductor 24 is disconnected from the high-voltage terminal 23 and the high-voltage side end 30 and is turned off, as shown in FIG. Such a gas gap g is established. The connecting conductor 24 is designed to have a length having this proper gas gap g.

  The operation handle 31 is preferably inserted into the operation device 28 only during operation for the purpose of avoiding malfunction. In the off state, the connection conductor 24 should be in a position having an appropriate gas gap with the high-voltage terminal 23. For this reason, the stopper 34 is installed so that the connecting conductor 24 is at an appropriate position in the off state or the on state, and has a stopper position adjusting function for installing at the appropriate position.

  FIG. 7 is a side view of the internal structure of the gas VT with the disconnecting means in the off state along the line AA shown in FIG. When the operation handle 31 is rotated clockwise from the off state shown in FIG. 7, the insulating frame 25 rotates clockwise, and the connection conductor 24 rotates accordingly, and the connection conductor 24 is connected to the high voltage terminal 23 and the high voltage side end. By being connected to 30, the ON state shown in FIG.

  The on state and the off state are held by locking the gear with a lock pin (not shown) provided in the gear box 32 interlocked with the operation device 28. The gear box 32 is provided with an open / close indicator (not shown), and the state of the switch is visible from the outside. The gear box 32 is provided with an auxiliary switch (not shown), and the state of the switch can be monitored electrically.

  The operation device 28 can connect or disconnect the connection conductor 24 by an automatic operation instead of a manual operation by the operation handle 31 by providing a power mechanism (not shown). In that case, the power mechanism moves the gear ring 26 by attaching an operation panel to the operation device 28 and giving an operation instruction of an on state or an off state from the operation panel. In addition, the power mechanism can perform automatic stop processing by automatically detecting that the gear ring 26 stops at the stopper 34 using, for example, a current value of the power motor or a detection sensor installed at the stopper.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various change is possible as shown below.

  The disconnecting means described in the present embodiment is configured to connect to the connection conductor 24 by the vertical movement of a spring (not shown) provided at the high voltage terminal 23 and the high voltage side end 30 and the force of the spring. However, since the purpose is to connect to or disconnect from the transformer connected to the high-voltage side end 30, the case where a large current flows is not assumed. However, the connection conductor 24, the high-voltage terminal 23, and the high-voltage side end 30 have a large connection area, the connection pressure between the terminals is increased, and a space in which heat is accumulated between the terminals is eliminated as much as possible. Therefore, it can be applied as a disconnector for large current.

  The insulating frame 25 described in the above-described embodiment has a ring shape. However, if the connecting conductor 24 can be moved to an appropriate position by rotating the insulating frame 25, the insulating frame having another shape can be used. Is applicable. FIG. 8 shows another embodiment of the insulating frame 25 described above. The insulating frame 25a shown in FIG. 8 has connection conductors 24 in linear portions extending radially from the center of the container 33 to the periphery. As in the above-described embodiment, the connecting conductor 24 attached to the insulating frame 25a is connected to the high-voltage terminal 23 (not shown) and the high-voltage side end 30 (not shown) by rotating the insulating frame 25a, or Disconnected.

  In FIG. 5, it has been described that the rotation of the insulating frame 25 converts the rotational axis direction of the rotational power of the operation handle 31 by the bevel gear or the like and is transmitted by the gear 35. It is also possible to move the insulating frame. FIG. 9 describes another power transmission mechanism. FIG. 9A shows a mechanism in which a gear is provided outside the gear ring 26 and engaged with a chain 36 or a belt corresponding to the chain 36 so that power is transmitted by the gear 35 a outside the container 33. FIG. 9B shows a power transmission mechanism in which a gear is provided outside the gear ring 26b and the shaft power from the operating device 28b is transmitted to the gear ring 26 by the worm gear 35b. In this way, it is possible to transmit power input from the operation device 28 manually or by external power such as a motor from the outside of the container 33 to the gear ring using parts other than the bevel gear 35. Further, FIG. 10 shows another power transmission mechanism, FIG. 10 (a) is a mechanism for rotating the gear ring 26 with a bevel gear 35c, and FIG. 10 (b) is a rack system for rotating the gear ring 26. It is a mechanism to make.

It is a side view of the internal structure of gas VT using the conventional multiphase switch. It is sectional drawing of the internal structure of gas VT using the conventional multiphase switch. It is an internal structure side view of gas VT with a disconnection means of the ON state by the Example of this invention. It is sectional drawing of gas VT with a disconnection means of the ON state by the Example of this invention. It is a perspective view which shows the gear ring by the Example of this invention. It is an internal structure side view of gas VT with a disconnection means of the OFF state by the Example of this invention. It is sectional drawing of the gas VT with a disconnection means of the OFF state by the Example of this invention. FIG. 3 is a diagram illustrating an insulating frame according to an embodiment of the present invention. (A) is a figure which shows the power transmission mechanism to the insulated frame using a chain, (b) is a figure which shows the power transmission mechanism to the insulated frame using a worm gear. (A) is a figure which shows the power transmission mechanism to the insulation frame using a bevel gear, (b) is a figure which shows the power transmission mechanism to the insulation frame using a rack.

Explanation of symbols

20 Gas VT with disconnection means
DESCRIPTION OF SYMBOLS 21 Insulation spacer 22 High voltage conductor 23 High voltage terminal 24 Connection conductor 25 Insulation frame 26 Gearing 27 Guide roller 28 Operation device 28d Power transmission device 29a High voltage coil 29b Low voltage coil 29c Iron core 30 High voltage side end 31 Operation handle 32 Gear box 33 Container 34 Stopper 35 Gear 35a Gear 35b Worm gear 35c Bevel gear 35d Rack 36 Chain

Claims (2)

A plurality of high voltage terminals connected to the high voltage conductors of each phase of the polyphase alternating current;
A plurality of voltage transformer elements disposed opposite to each of the high-voltage terminals, and having a high-voltage connection terminal;
Between the high voltage terminal and the high voltage connection terminal, an insulating frame having a plurality of movable connection conductors for connecting each of said high voltage terminal and the terminal for each said high voltage connection,
A container for housing the plurality of high-voltage terminals, the plurality of voltage modifying elements, and the insulating frame;
The insulating frame is rotated in the circumferential direction, and the movable connecting conductors are brought into contact with or separated from the high-voltage terminals and the high-voltage connecting terminals, and are in the radial direction of the insulating frame. A drive unit disposed on the side of the container ;
A gas insulated instrument transformer, comprising: The insulating frame is attached to a gear ring having a gear on the outer periphery;
2. The transformer for gas insulation instrument according to claim 1, wherein the drive unit transmits power to the gear ring to rotate the insulating frame in a circumferential direction. 3.

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