JPS59181603A - Tap selecting switch for 3-phase transformer - Google Patents

Abstract

1. A load-changer for switching step windings of a three-phase transformer comprising fixed contacts (8) arranged on a ring in a plane for each phase and connected to taps of closely-stepped windings, characterized in : that there are circuit device with respective specific assemblies for selectors and load switches is known manner ; the closely-stepped windings (U3, V3, W3) are parts of windings of the three phases (U, V, W) which are electrically switched in a triangle and the closely-stepped windings (U3, V3) of the first and second phase are arranged at a common corner point of the triangle connection ; that the two planes (2, 3) which house the fixed contacts (8) opf the taps of one of the first and second closely-shepped windings (U3, V3) assigned to the common corner point have a spacing in accordance with the relatively small differences in potential between said two closely-stepped windings (U3, V3) ; and that the plane (4) which houses the fixed contacts (8) of the third closely-stepped winding (W3) is spaced from the nearest of the two other planes (3) to be at least in accordance with the operating and testing voltages between the phases (U, V, W) of the entire winding.

Description

[Detailed description of the invention]

[Technical field to which the invention pertains] The present invention relates to a tap selection method for a three-phase transformer having a fixed contact arranged on one circumference on one plane on one plane for each phase and coupled with a dense tap winding glue. Involved in switches. , [Prior art and its problems] Tap selection switch (11) Compared to a normal tap selection device, contacts and switches for all three phases can be incorporated into a single cylinder even when triangular connection is used. This has the great advantage that, in ordinary tab selection devices with special load switchgears, the large spacing between the contacts of each phase of the load switchgear required in this case is In the tap selection switch known from German Patent Application No. 2731133, the fixed contacts of each phase connected to the taps of the close tap winding each lie in one plane. The movable contact is arranged on the circumference of one of the upper circles, and the movable contact rotates around the center of the circle to switch the next knob.Furthermore, according to West German Patent Publication No. 2913271-q, there are three phases. It is known that the fixed contacts of close-tapped windings belonging to different phases are electrically insulated from each other against all phase voltages including the test voltage.The fixed contacts of close-tapped windings belonging to different phases are Due to the correspondingly large spacing from each other, this known solution results in an uneconomically large overall height for the cylinder of the tap selection switch, especially at high rated voltages. has a total height comparable to that of a tap selection switch installed on the neutral point side of a transformer winding connected in a star shape.A tap selection switch that can also be used for a triangularly connected transformer winding. ``Means for achieving the object'' This object is to provide a tap selection switch of the above type, in which the close tap windings are electrically triangularly connected. A portion of a winding in which the close tap windings of the first phase and the second phase are placed in contact with one common vertex of the triangular connection, and each evening of the two close tap windings is The fixed contacts of the two planes were arranged, or the contact points of the third problem of Kuppu-wound paddy were arranged within the space corresponding to the relatively small ridge pressure difference between the two close-contact windings. The distance between 1,000 ml and the plane closest to this plane among the two planes σ) shall be set at least C for the operating pressure between the valley tags of the full length string and the pressure for the test'. [Embodiments of the invention] In the tap selection switch known from West German Patent Application No. 29] 3271 @', a three-phase The opening/closing contacts of the coarse tap selector are arranged on one common plane and offset from each other by the same angle in the circumferential direction of the selector cylinder. However, this seven'

[In the case of one-piece construction, the maximum rated voltage is limited when the diameter of the selector cylinder is set in advance. Na-U° (Go transformer @ Tsuzuri is triangular connection Norujin,
This is because the insulation distance for all holes to be burnt to 11 millimeters of pressure must be set three times in the circumferential direction. Of the two planes in which the fixed contacts of the coarse tap selector for transposition switching connections are arranged, one of the planes has two planes placed in contact with the common triangular vertices of the phases to which they belong in terms of potential. the contacts of the coarse tap selector are clustered at a 180° offset, and the plane of the coarse tap selector is provided spatially adjacent to one or both planes of the fine tap selector belonging to the same triangular vertex; On the other plane, the contacts of the coarse tap selector belonging to the third fine tap winding are provided spatially adjacent to the contact plane of the third fine tap winding. The fixed contacts of the coarse tap selector belonging to the tap winding correspond to the fixed contacts of the coarse tap selector belonging to the second fine tap winding. In another advantageous embodiment of the invention, the movable contacts of all three phases cooperating with the inner rectangular contacts of the close-tap winding have one common contact made of insulating material. The movable bridging contacts supported by the rough tube and cooperating with the fixed contacts of the tap selector are all arranged radially equidistant (d) from the tap selector axis, with the uppermost coarse tap The selector contacts are driven via an insulating medium or an insulating tube provided outside the insulation used for driving the close tap selector contacts. An embodiment of the tap selection switch based on the above-mentioned tap selection switch will be described below.
/IJl, v, t, WI Lm') y FuS+7
U2. V2. W2 and close tap winding 3. V3. 3 is provided.・Sho Tatsufu volume dU3 and ■3 are combined with each other at one common triangular vertex by '-ki' λ. Tap I of the valley winding belonging to the same note
The 71st conversion will take place on the LP of Tafu Sekusei Shusho. Tawa 1 selection υ 9 Do you have a follower of death in Figure 2 and Figure 5? 3 Fixed contacts 8 are fixed on planes 1 to 5 which are directly adjacent to this cylindrical axis on a Q external circle '1 line 0 made of edge material.
V2. W2 ToVfj'l! / Line Lj3.
V3. W3 (!: (7) M1 is suddenly changed to the old one by a method not shown in the figure.
It is set up. In this case, the output wire of the close tap winding U30 is connected to the fixed contact 8 on the plane 2, and the winding output wire of the close tap winding V3 is connected to the fixed contact 8 on the plane 3. Between the fixed contact 8 on the plane 2 and the fixed contact 8 on the plane 3,
At most, close-circuit winding LJ: 3. Since only the phase-to-phase voltage across V3 appears, the spacing between these two planes is relatively small, corresponding to a relatively low voltage on the negative side. The winding lead wire of the close tap winding W3 is electrically coupled to a fixed contact on the outer cylinder 60 and 4. Close tap winding Hi W3 winding outlet 7 glands and close tap winding paste No. 3
゜■ Mutual ji:i'' with the winding lead wire of 3 is a full triangle □
Since the pressure is applied, the vertical spacing between the planes 3.4 is designed to be correspondingly large in order to ensure the necessary voltage strength. 1", that is, the spacing between planes 3 and 4 is significantly wider than the spacing between planes 2. V3 is at the same potential as the winding lead wire of V3 and is connected to a fixed contact 8 on the plane l.In this case, as shown in FIG. Coarse tap winding (corresponding to the contact point of 2) is provided on the circumference of the outer plate 6. Flat surface 1.
2. The distance between the dark circles is the same as that of the wiring, and the starting tap width H, yU3°~', 3 and the coarse tap winding belonging to the triangular addition point are 2. v3
The phase M is small in accordance with the relatively small tortoise pressure negative xrJ between them, and is approximately equal to the spacing between the planes 12 and 3. The winding lead wire of the coarse cup winding W2 is again connected to a fixed contact 8 on the flat surface 5 which is TIED at a slight distance (2-2) below the flat surface 4. Now, the voltages applied to each winding lead wire of the fine tap winding~■3 and the coarse tap winding w2 differ by a voltage corresponding to the entire vA range at most. be. Therefore plane 4.5
The vertical spacing between them is equal to the spacing of Hirata] 1.2 cm. In each plane 2.3.4 one movable contact 7 is provided, which movable contact can be connected to the neighboring fixed contact 8) without interrupting the current by means not shown in detail. Can be rotated to the contact point. All movable contacts 7 are supported by a tube 12 made of solid-wire material common to them. A fixed contact 8 on the plane 1.5 cooperates with a movable bridging contact 9,
These movable bridging contacts each interconnect contacts 8 which are arranged next to each other in the plane 1 or 5+. Bridging contact 9
are supported by tube sections 10 or 11, insulating rods or insulating segments. For driving the roughness 2-beam selector 5,
A hollow shaft 13 located in the center of the tube 12 and driven directly by a saver drive mechanism 14 or a suitable shaft. A three-edge bar is used. A suitable design of the Geneva drive ensures, on the one hand, an identical movement for tube pieces 0 and 1, and, on the other hand, that tube piece 1.0.11 is engaged only in the switching phase consisting of tube 12. , in other stages, it is ensured that the original position is maintained even if the tube 12 is switched. Are the tubes 12 lined up in order to reduce the bearing load as much as possible?
This hollow shaft 13 has a flange 15 at its lower end below the plane 5.
The tube 12 and the upper ends of the hollow shaft j3 are bearing supported in or on the Geneva 1 drive mechanism 14 arranged on the upper flange 15. Furthermore, the tube piece 10 is bearing-supported at the upper end of the tube 12, and is optionally provided with an upper flange 16 on the outside. It is also supported for ζ. When the tap selection switch according to the invention is used in a three-phase transformer without a coarse tap selector, the planes 2.3. Only the fixed contact 8 on 4 and the attached movable contact 7 remain. However, in this case too, the tap selection switch according to the invention can be advantageously employed. This is because on one side the small spacing between planes 2 and 3 guarantees a very small overall height, and on the other hand plane 3
．． This is because, by increasing the interval between the four points as much as possible, it can be used even in the case of a very large rated voltage. [Effects of the Invention] According to the present invention, even when the windings of a transformer are connected in a triangular manner, the dragon or n
Since the two planes on which the fixed contacts of each tap of the 1st and 2nd phase close tap windings are arranged can be placed close to each other regardless of the rated voltage of the transformer, the overall height of the tap selection switch can be reduced. can be kept low. In addition, even when the foot ′i pressure is equal, only the distance between the plane where the contact point of the third peak and the knee is located and the plane near this plane of the above-mentioned knee] is examined. Increases in response to voltage1◇Also,
Monkey in one place.

[Brief explanation of the drawing]

The drawings show an actual example of the tap selection switch according to the present invention, where Figure 1 is a biangular connection diagram of a transformer winding, and Figure 2 is an axial cross-section of a three-phase tap selection switch. Loose 1, zu↓3
Figures 4 and 5 are shown in Figure 2 respectively) Cutting of each cup selection i4 paste 1n-111, IV -IV, V-
The cross-section section by V is a.

Claims (1)

[Claims] 1) A tap selection switch for a three-phase transformer comprising fixed contacts disposed on one circumference on one plane on one plane for each phase and coupled to taps of a close tap winding; The close tap winding is a part of the three-phase winding electrically connected in a triangular manner, and the first
The close tap windings of the phase and the second phase are placed in contact with one common vertex of the triangular connection, and the two planes on which the fixed contacts of the respective taps of these two close tap windings are arranged are a plane with a spacing corresponding to the relatively small voltage difference between these two close-tapped windings, in which the contacts of the third close-tapped winding are arranged, and a plane close to this plane among said two planes; A tap selection switch for a three-phase transformer, characterized in that the interval between the two is designed to correspond to at least the operating voltage and test voltage between each phase of all windings. 2. In the switch according to claim 1, the first of the two planes for arranging the fixed contact of the coarse tap selector for polarity switching connection or transposition switching connection
and the plane for the fixed contact of the coarse tap selector belonging to the second fine tap winding is located at the top of the contact planes of the fine tap winding; and the plane for the fixed contact of the coarse tap selector belonging to the third fine tap winding is arranged at intervals corresponding to the sum of the voltages of the coarse tap winding and the plane of the contact of the fine tap winding. A tap selection switch for a three-phase transformer, characterized in that the tap selection switch for a three-phase transformer is disposed below the lowest one of the taps at intervals corresponding to the voltage accounts of at least one of the fine and coarse tap windings. 3) 4E? In the switch according to claim 1 or 2, the fixed contact of the coarse 2-bread winding belonging to the first close tap winding is connected to the coarse tap winding belonging to the second close tap winding. A tap selection switch for a three-phase transformer, characterized in that the fixed contacts of the tap selection switch are oriented 180° in the direction of rotational force of the shaft of the tap selector. 4) In the switch according to any one of claims 1 to 3, all the three-phase movable contacts that cooperate with the fixed contacts of the close tap winding are made of an insulating material. Common 7
．． ! : A tap selection switch for a three-phase transformer characterized by being supported by a pipe. The movable bridging contacts cooperating with the fixed contacts of the rough tap and tap windings are all mounted on a tube or piece of insulating material at an equal radial distance from the tap selector axis and are provided with a similarly actuated Geneva bar. A tap selection switch for a three-phase transformer, characterized in that the tap selection switch is connected via a drive mechanism. A tap selection switch for a three-phase transformer, characterized in that the tube for the contact is supported in bearings below the lowest one and above the highest one of the planes for the fixed contact.