JP2014072197A - Low-voltage coil for instrument transformer, instrument transformer and winding method of low-voltage coil for instrument transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-voltage coil for an instrument transformer for which it is not necessary to pull around a lead by enabling a winding start lead and a winding end lead to be drawn in the same direction according to a simple winding method without adding any special structure in the case of winding for odd layers, the instrument transformer with the low-voltage coil and a winding method of the low-voltage coil for the instrument transformer.SOLUTION: In a low-voltage coil 4 of winding for odd layers, a winding start lead 6a which is one end portion of a wire 10 is disposed in one end of a cylindrical winding core, the wire 10 is laid from one end side to another end side of the winding core along an axial direction of the winding core on an outer surface of the winding core for a predetermined length, the wire 10 is then wound around the winding core multiple times from the other end side to the one end side so as to roll in a portion laid on the outer surface, thereby forming a bottom layer, and a winding end lead 6b which is the other end portion of the wire 10 is drawn closer to the winding start lead 6a.

Description

  The present invention relates to a low voltage coil of an instrument transformer, which is an instrument transformer or an instrument current transformer, an instrument transformer, and a winding method of the low voltage coil of the instrument transformer.

  The low voltage coil, which is the secondary coil of the instrument transformer, has a different number of turns depending on its specifications, and is used from one layer winding to multilayer winding depending on the number of turns.

  By the way, in general, when the number of winding layers of the low voltage coil is an even number, the winding start lead and the winding end lead are drawn out in the same direction, but when the number of layers is an odd number, the winding start lead and the winding end lead are mutually Pulled in the opposite direction. For example, in the case of two-layer winding, a winding start lead is arranged on one end side of the core, the wire is wound from one end side of the core toward the other end side to form the first layer, and the other end side When the second layer is formed by overlapping and winding on the first layer from one end to the other end side, the winding end lead is arranged on the same side as the winding start lead and pulled out in the same direction. Also, for example, in the case of one-layer winding, when a winding start lead is disposed on one end side of the core and the wire is wound from one end side to the other end side to form the first layer, The end lead is arranged on the side opposite to the winding start lead and pulled out in the opposite direction.

  Therefore, in an instrument transformer in which a low-voltage coil having an odd number of windings is incorporated, for example, it is necessary to route the end-of-winding lead to the start of winding. Since both the winding start lead and the winding end lead are drawn to the outside through the sealed terminal plate of the instrument transformer, in the case of an odd-layer low-voltage coil, for example, the length of the winding end lead is longer than the length of the winding start lead. However, it is necessary to secure a sufficiently long length and draw the winding end lead to the winding start lead side, and then draw the winding start lead and the winding end lead to the outside through the sealing terminal plate.

  In Patent Document 1, an insulating gas is enclosed in an instrument transformer body including a secondary coil wound around an iron core and a primary coil concentrically wound outside the secondary coil. In a gas insulated instrument transformer housed in a separate container, a plurality of layers of tap adjustment coils are concentrically arranged on the winding start side of the primary coil, and a low voltage potential is fixed inside and outside the tap adjustment coil of each layer. Place the plates concentrically, connect both ends of the tap adjustment coil of each layer to the inner and outer low-voltage potential fixing plates, and pull out the voltage adjustment terminals in the same direction from each low-voltage potential fixing plate to which the tap adjustment coils are connected The configuration is disclosed.

Japanese Utility Model Publication No. 5-72119

  As described above, in the low voltage coil of the conventional instrument transformer, when the number of winding layers is an odd number, the winding start lead and the winding end lead are drawn out in the opposite directions, so that the lead must be routed. .

  For this reason, there is a problem that the wiring work of the lead requires time, lead fixing parts are required, the resistance value increases as the lead wire becomes longer, and this causes a measurement error.

  In Patent Document 1, the voltage adjustment terminal can be pulled out in the same direction regardless of the number of layers. However, this technique is originally applied to a tap adjustment coil, and a low-voltage potential fixing plate is provided. Since it is necessary to provide a special structure, there is a problem that the configuration is complicated.

  The present invention has been made in view of the above, and in the case of odd layer winding, the winding start lead and the winding end lead are arranged in the same direction by a simple winding method without adding a special structure. An object of the present invention is to provide a low voltage coil for an instrument transformer that can be pulled out and that does not require routing of a lead, an instrument transformer that includes the low voltage coil, and a winding method for the low voltage coil of the instrument transformer. .

  In order to solve the above-described problems and achieve the object, a low-pressure coil of an instrument transformer according to the present invention includes an iron core housed in a tank filled with insulating gas or insulating oil, and wound around the iron core. An odd layer winding low voltage coil applied to a voltage transformer having a voltage transformer element or a current transformer element having a low voltage coil and a high voltage coil, and one end portion of a wire rod at one end of a cylindrical core A winding start lead is disposed, and the wire rod is wound on the outer surface of the core for a predetermined length along the axial direction of the core from one end side to the other end side of the core; The wire rod is wound around the core a plurality of times from the other end side toward the one end side so as to wind the portion wound on the outer surface, and the lowermost layer is formed, and at the other end portion of the wire rod, A lead at the end of a winding is pulled out to the winding start lead side And characterized in that.

  According to the present invention, in the case of odd layer winding, the winding start lead and the winding end lead can be drawn out in the same direction by a simple winding method without adding a special structure, and it is necessary to route the lead. There is an effect that there is no.

  Further, according to the present invention, since there is no need to lead the lead, the lead wiring work is simplified, the work time is shortened, and lead fixing parts are not required.

  In addition, according to the present invention, the lead wire becomes the shortest and the resistance of the lead becomes small, so that improvement in measurement error can be expected and the rated burden can be increased.

  In addition, according to the present invention, since the portion of the wire connected to the lead at the beginning of winding is wound and fixed in the first layer, it is not necessary to reinforce the winding start lead with a tape or the like.

FIG. 1 is a longitudinal sectional view showing a schematic configuration of an instrument transformer according to an embodiment. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a side view showing the configuration of the low voltage coil according to the embodiment. 4 is a cross-sectional view taken along the line CC in FIG. FIG. 5 is a side view showing a configuration of a conventional one-layer wound low-voltage coil.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a low voltage coil of an instrument transformer, an instrument transformer, and a winding method of a low voltage coil of an instrument transformer according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a longitudinal sectional view showing a schematic configuration of an instrument transformer according to the present embodiment, and FIG. 2 is an AA sectional view in FIG. 1 is also a cross-sectional view taken along the line BB in FIG. The instrument transformer is an instrument transformer or an instrument current transformer. An instrument transformer is used, for example, for voltage measurement of a high voltage circuit. An instrumental current transformer is used, for example, for current measurement of a large current circuit.

  As shown in FIGS. 1 and 2, the instrument transformer according to the present embodiment includes a tank 1, an iron core 5 housed in the tank 1, a low voltage coil 4 wound around the iron core 5, and a low pressure A high voltage coil 3 coaxially wound around an iron core 5 with the coil 4, a pair of leads 6 of the low voltage coil 4, and a sealed terminal plate 7 provided in the tank 1 for pulling out the leads 6 to the outside; Insulating gas 2 is filled in 1.

  The high voltage coil 3 is a primary coil. The low voltage coil 4 is a secondary coil. In the present embodiment, it is assumed that the low voltage coil 4 is an odd layer winding. Here, the odd-numbered layer winding means that the wire (winding) of the low-voltage coil 4 is wound in an odd number of layers in the radial direction of the core.

  When the instrument transformer is an instrument transformer, the iron core 5, the low voltage coil 4, and the high voltage coil 3 constitute a voltage transformer element. In the case where the instrument transformer is an instrument current transformer, the iron core 5, the low voltage coil 4, and the high voltage coil 3 constitute a current transformer element. In this embodiment, the insulating gas 2 is sealed in the tank 1, but insulating oil may be sealed instead of the insulating gas 2.

  Next, the configuration of the low voltage coil 4 will be described. FIG. 3 is a side view showing the configuration of the low-voltage coil 4 according to the present embodiment, and FIG. 4 is a cross-sectional view taken along the line CC in FIG.

  As shown in FIGS. 3 and 4, in the low voltage coil 4, a wire core (winding) 10 is wound around a cylindrical winding core 8 a plurality of times, and winding start leads 6 a and one end of the wire rod 10 are formed. The winding end lead 6b which is the other end is pulled out to one end of the winding core 8 on the winding start lead 6a side, and the winding portion formed by winding the wire 10 a plurality of times is displaced in the axial direction of the winding core 8. So that the locking collars 9 are provided on both sides thereof. The wire 10 constitutes a coil body and is provided with a conducting wire or the like. The collar 9 is made of a plate-like insulating member and is wound around the outer surface of the core 8.

  Next, the winding method will be described. The winding start lead 6a is disposed at one end of the winding core 8, and a portion connected to the winding start lead 6a of the wire 10 is a predetermined portion along the axial direction of the winding core 8 from one end side to the other end side of the winding core 8. After the wire 8 is wound on the outer surface of the core 8 in a straight line shape, the wire 10 is wound so as to wind the straight portion of the wire 10 wound on the outer surface from the other end side toward the one end side. The coil 8 is wound a plurality of times to form the lowermost layer of the coil, and the winding end lead 6b is drawn out to the winding start lead 6a side.

  The illustrated example shows an example of a single-layer low-voltage coil 4, and the winding portion is composed only of the lowermost coil layer. In the case of multilayer winding (that is, the number of layers is 3, 5, 7, etc.), after forming the lowermost layer of the coil, multiple layers are formed by lap winding on the wire 10 constituting the lowermost layer. For example, in the case of three-layer winding, after forming the lowermost layer, the winding is performed from one end side of the core 8 toward the other end side, and further from the other end side of the core 8 toward one end side. As a result, the coil second layer and the coil third layer are formed, and the winding end lead 6b can be pulled out toward the winding start lead 6a as in FIG.

  In FIG. 3, after winding the part connected to the winding start lead 6a of the wire rod 10 on the outer surface of the core 8 in a straight line having a predetermined length, the winding is started from the folded portion indicated by P, and the direction indicated by D That is, the winding is advanced in the direction from the other end side to the one end side of the core 8 to form the lowermost layer. A dotted line indicates that a straight line portion connected to the winding start lead 6 a of the wire 10 is disposed below the lowermost layer of the coil and a part of the rear side of the wire 10 is disposed.

  On the other hand, FIG. 5 shows a configuration of a conventional one-layer wound low voltage coil 4. As shown in FIG. 5, in the conventional low voltage coil 4, the winding is advanced in the direction indicated by the arrow E from the winding start lead 6 c (that is, the direction from one end side to the other end side of the winding core 8). Thus, the winding start lead 6c and the winding end lead 6d are drawn out to the opposite sides. When this conventional low voltage coil 4 is applied to an instrument transformer, it is necessary to route the winding start lead 6c or the winding end lead 6d to the sealed terminal plate 7.

  As described above, according to the present embodiment, the winding start lead 6a and the winding end lead 6b are the same in the low voltage coil 4 of the odd layer by a simple winding method without adding a special structure. The lead 6 can be pulled out in the direction, and there is an effect that the lead 6 does not need to be routed.

  Further, according to the present embodiment, since there is no need to route the lead 6, the wiring work of the lead 6 is simplified, the work time is shortened, and lead fixing parts are not required.

  In addition, according to the present embodiment, the lead wire is the shortest and the resistance of the lead 6 is reduced, so that improvement in measurement error can be expected and the rated burden can be increased.

  In addition, according to the present embodiment, since the linear portion of the wire 10 connected to the winding start lead 6a is wound and fixed in the first layer, reinforcement of the winding start lead 6a with a tape or the like becomes unnecessary.

  INDUSTRIAL APPLICABILITY The present invention is useful as a low voltage coil for an instrument transformer, an instrument transformer, and a winding method for a low voltage coil of an instrument transformer.

1 tank, 2 insulating gas, 3 high voltage coil, 4 low voltage coil, 5 iron core, 6 lead, 6a, 6c winding start lead, 6b, 6d winding end lead, 7 sealing terminal plate, 8 core, 9 collar, 10 wire material.

Claims (3)

Applied to an instrument transformer having a voltage transformer element or a current transformer element having an iron core housed in a tank filled with insulating gas or oil, and a low voltage coil and a high voltage coil wound around the iron core. An odd layer winding low voltage coil,
A winding start lead, which is one end of a wire rod, is disposed at one end of a cylindrical core, and the wire rod has a predetermined length along the axial direction of the core from one end side to the other end side of the core. After being wound on the outer surface of the winding core, the wire rod is wound around the winding core a plurality of times from the other end side to the one end side so as to wind the portion wound on the outer surface, and the lowest layer Is formed, and the end-of-winding lead that is the other end of the wire is drawn out to the start-of-winding lead side.   An iron core housed in a tank filled with an insulating gas or insulating oil, a low voltage coil of the instrument transformer according to claim 1 wound around the iron core, and a high voltage coil wound around the iron core; An instrument transformer comprising a voltage transformer element or a current transformer element. Applied to an instrument transformer having a voltage transformer element or a current transformer element having an iron core housed in a tank filled with insulating gas or oil, and a low voltage coil and a high voltage coil wound around the iron core. An odd layer winding low voltage coil winding method,
A winding start lead, which is one end of a wire rod, is disposed at one end of a cylindrical winding core, and the wire rod has a predetermined length along the axial direction of the winding core from one end side to the other end side of the winding core. After winding the outer surface of the winding core, the wire rod is wound around the winding core a plurality of times from the other end side to the one end side so as to wind the portion wound on the outer surface, and the lowermost layer is formed. In the case of multi-layer winding, the wire rod is further wound on the lowermost layer according to the number of layers, and the winding end lead that is the other end portion of the wire rod is pulled out to the winding start lead side. A winding method of a low voltage coil of an instrument transformer.

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