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Instrument Transformer

A technology for transformers and instruments, applied in transformers, inductors, voltage/current isolation, etc., can solve the problems of larger measurement errors and inappropriate measurement accuracy, and achieve the effect of smaller radial dimensions

Active Publication Date: 2016-03-02
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a structure, the middle electrode of the self-phase is generally more easily affected by the electric field of the conductor of the other phase, so that the measurement error becomes larger due to the induced voltage of the other phase, so it is generally not suitable for situations requiring higher measurement accuracy.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] figure 1 is a diagram showing a transverse cross-sectional structure of an instrumentation transformer according to the present embodiment, figure 2 is along figure 1 The longitudinal section structure diagram of A-A line, image 3 yes figure 2 Detail drawing of part B.

[0033] Figure 1 ~ Figure 3 The structure of an instrument transformer used in a three-phase integrated gas insulated switchgear is shown in . There is, for example, SF in the enclosure 6 Three-phase central conductors 2a to 2c are collectively accommodated in a cylindrical metal container 1 containing an insulating gas such as gas. The metal container 1 is, for example, cylindrical and grounded. Central conductors 2a to 2c extend in the direction of the central axis of the metal container 1, respectively. Since the central axis of the metal container 1 and the respective central axes of the central conductors 2a to 2c are parallel to each other, the directions of these central axes are sim...

Embodiment approach 2

[0052] Figure 7 is a diagram showing a part of the longitudinal cross-sectional structure of the instrument transformer according to Embodiment 2, and is intended to be related to Figure 4 Figure for comparison. In this embodiment, based on the configuration of Embodiment 1, the relationship between the inner diameters of the intermediate electrodes 5 a to 5 c and the inner diameter of the insulating member 10 is further specified. That is, if Figure 7As shown, the inner diameter of the ring-shaped insulating member 10 located between the metal joint part 3 and the intermediate electrode 5a is smaller than the inner diameter of the intermediate electrode 5a (refer to the P area), b=(inner diameter of the intermediate electrode 5a-insulating member 10 inner diameter) / 2>0. In addition, the same relationship is also established for the intermediate electrode 5b and the insulating member 10 in contact with the intermediate electrode 5b, and for the intermediate electrode 5c ...

Embodiment approach 3

[0056] Figure 9 is a diagram showing a part of the longitudinal cross-sectional structure of the instrument transformer according to this embodiment, and is intended to be related to Figure 4 Figure for comparison. In this embodiment, based on the configuration of Embodiment 1, for example, the relationship between the length in the axial direction of the intermediate electrode 5 a and the length in the axial direction of the ground shield 4 a is further specified. That is, if Figure 9 As shown, when the axial length of the intermediate electrode 5 a is C and the axial length of the ground shield 4 a is D, D≧C is satisfied in this embodiment. In addition, the same relationship holds also for the intermediate electrode 5b and the ground shield 4b, and the intermediate electrode 5c and the ground shield 4c.

[0057] Figure 10 It is a graph showing the error caused by other phase induction with respect to the axial length D of the ground shield 4a. Figure 10 shows the r...

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PUM

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Abstract

Provided is a transformer for instruments, said transformer provided with: a metal adapter (3); cylindrically shaped intermediate electrodes (5a - 5c) that are attached to peripheral edge parts of hole parts (20a - 20c) in the metal adapter (3) via ring shaped insulator members (10) and that surround the periphery of center conductors (2a - 2c); substantially cylindrically shaped grounding shields (4a - 4c) each disposed so as to be adjacent to the respective intermediate electrode (5a - 5c) along the direction of an axial line; and an insulating sealed terminal mounted in a branching tube provided on the side surface of a metal container (1) and air tightly extracting lead wires connected to each of the intermediate electrodes (5a - 5c). The inside diameter of the intermediate electrodes (5a - 5c) is greater than the inside diameter of the respective grounding shields (4a - 4c).

Description

technical field [0001] The invention relates to an instrument transformer used in a three-phase integrated gas insulated switchgear. Background technique [0002] In a three-phase integrated gas insulated switchgear, three-phase conductors are collectively accommodated in a metal container in which an insulating gas is sealed. The instrument uses a transformer to measure the voltage of each phase conductor. Some instrument transformers used in three-phase integrated gas insulated switchgear adopt a structure in which a ring-shaped intermediate electrode coaxially surrounds each phase conductor (for example, refer to Patent Document 1). Figure 8 ). In such a structure, the middle electrode of the self-phase is generally more easily affected by the electric field of the conductor of the other phase, so that the measurement error becomes larger due to the induced voltage of the other phase, so it is generally not suitable for situations requiring high measurement accuracy. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/24G01R15/20H02B13/02
CPCH02B13/0356G01R15/16H01F38/24
Inventor 平井圣之羽马洋之
Owner MITSUBISHI ELECTRIC CORP