JPH01316910A - Coil of outside iron transformer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin molded transformer, and more particularly to a coil terminal arrangement structure of an external iron transformer suitable for preventing thermal deterioration of the coil over time.

[Conventional technology]

The conventional outer iron type cylindrical coil transformer was developed in 1986-6.
As disclosed in Publication No. 6014, attempts were made to maintain high reliability by using insulating materials with different heat resistance properties for the elementary coils arranged in the axial direction, and by selectively selecting resins and using different current densities of conductors. There is. The above conventional technology assumes that the arrangement of the coil is always fixed and does not change, and that it deteriorates at a certain time under certain temperature conditions. Judgment is made based on the condition of the insulating material such as interlayer paper, and normally the lifespan was thought to be 20 to 25 years.

[Problem to be solved by the invention]

It is a challenge to further extend the life of the above-mentioned transformers. For example, Fig. 5 shows a side view of a conventional external steel transformer, and Fig. 6 shows a view taken in the direction of arrow B in Fig. 5. Since the low voltage winding start terminal 1 and the low voltage winding end terminal 2 are pulled out in the same direction with respect to the coil 5, it is impossible to turn the coil 5 upside down together with the iron core 6 and reuse it. The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to extend the life of the external iron type transformer and provide an external iron type transformer with excellent reliability and maintainability.

[Means to solve the problem]

The above purpose is to create a structure in which the coils and outer iron core that make up the transformer are reversed so that the upper end coil can be replaced with the lower end coil, and the coil terminals are symmetrical with respect to the above-mentioned inversion center point. This is achieved by placing.

[Effect]

With the above configuration, by reversing the upper and lower ends of the external iron type transformer, the winding start terminal and winding end terminal on both the high voltage and low voltage sides are exchanged and the connection is changed, so that the transformer itself can be reassembled without changing its performance characteristics.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing one embodiment of the outer iron transformer coil of the present invention, and FIG.
The figure shows a view taken in the direction of arrow A in FIG. In both figures, 56 is an iron core, 55 is a coil, 60 is an upper clamp, 61 is a lower clamp, 63 is a base, 58 is a low voltage terminal, and 59 is a high voltage terminal. Low voltage winding start terminal 5 pulled out from the coil 55
1 and a low voltage winding end terminal 52 are arranged at symmetrical positions above and below the coil 55, and the low voltage terminal 5 is connected to the low voltage terminal 5 through a terminal connection bar 57.
8 using the terminal tightening port 62, the distance a from the upper surface of the upper clamping fitting 6o to the low pressure winding start terminal 51, and the distance dimension from the lower surface of the lower clamping metal fitting 6 to the low pressure winding end terminal 54. Assembling is performed by setting so that a' is equal. Similarly, a high voltage winding start terminal 51 provided on the side of the coil 55
and the high-voltage winding end terminal 54 are connected to the high-voltage terminal 59, respectively, and the distance dimension from the upper end surface of the coil to the high-voltage winding start terminal 53 is equal to the distance dimension b' from the lower end surface of the coil to the high-voltage winding end terminal 54. It is set up and assembled as follows. As a result, the low voltage terminal 58 and the high voltage terminal 59
, when the terminal tightening port 62 and base 63 are removed, the coil 55, iron core 56, low voltage winding start terminal 51, low voltage winding end terminal 52, high voltage winding start terminal 53, and high voltage winding end terminal 54 are all at a point with respect to the center O. Since the arrangement is symmetrical, flip the top and bottom and connect the low voltage terminals 58. It is possible to reconnect the high voltage terminal 59, terminal clamping port 62 and base 63. Since the winding start terminal and winding end terminal are switched between the high voltage side and the low voltage side at the same time, the performance characteristics of the transformer do not change. FIG. 3 is a diagram showing the AA cross section in FIG. 2, and the average temperature difference T and coil height H in this cross section.
A characteristic diagram showing the relationship is shown in FIG. Therefore, by turning the coil 55 upside down according to the present invention, it is possible to average out the deterioration of each part of the coil 55 due to a rise in temperature. Although the above embodiment shows an outer iron type transformer, an inner iron type transformer can easily be turned upside down. The present invention also applies mutatis mutandis to dry type transformers.

〔Effect of the invention〕

By implementing the present invention, the service life of the transformer can be further extended by turning the transformer upside down at a predetermined time to prepare for the rising temperature of the coil and the deterioration of insulators such as the resin mold and winding interlayer paper that form the coil. It is possible to extend the period by 5 to 10 years, which has a great effect on improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the outer iron transformer coil of the present invention, FIG. 2 is a view taken along arrow A in FIG. 1, and FIG. FIG. 4 is a characteristic diagram showing the axial height of the coil and the temperature change of the coil, FIG. 5 is a side view of a conventional outer iron transformer coil, and FIG. 6 is a view taken along arrow B in FIG. 51...Low voltage winding start terminal 52...Low voltage winding end terminal 53...High voltage winding start terminal 54...High voltage winding end terminal 55...Coil 56...Iron core 57...
・Terminal connection bar 58...Low voltage terminal 59...High voltage terminal 60...Upper tightening fitting 61...Lower tightening fitting 62...Terminal tightening port 63...Base/-1st pressure concubine Starting height 1 8-wabi pressure, spring rash, Karasuko 3-9-high mutual elimination beginning A child 4-11 island mutual port r totsu bundle 6 children 6--coil J-11 iron J bi 8- Picking pressure plate q--1 high Dl /6--・Jacket 15 1 cm tray ff--Ichigesuke groaning golden smell

Claims (1)

[Claims] 1. In an iron core and a coil of an external iron type transformer wound in a cylindrical shape around the iron core, a winding start terminal and a winding end terminal of the coil are arranged at points symmetrical positions with respect to the center of the longitudinal section of the transformer. A coil of an external iron type transformer characterized by: