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System for protetion of dry type transformers

一种变压器、三相变压器的技术，应用在用于限制过电流/过电压的紧急保护电路装置、变压器/电感的零部件、紧急保护电路装置等方向，能够解决单相系统无法适于三相三角形连接变压器等问题

Active Publication Date: 2017-09-26
HITACHI ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Likewise, the single-phase system disclosed in the '673 patent cannot be adapted for use in a three-phase delta-connected transformer.
However, since the system taught in the '673 patent is not a single phase system using an oil filled transformer, this is not a problem with the system taught in the '673 patent

Method used

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  • System for protetion of dry type transformers
  • System for protetion of dry type transformers
  • System for protetion of dry type transformers

Examples

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Embodiment Construction

[0062] Referring now to the drawings, in which like reference numerals designate corresponding structures throughout.

[0063] figure 1 with figure 2 Each depicts a known surge arrester system 30 according to the prior art, in which a three-phase delta-connected transformer with three windings 10, 12, 14 ( figure 1 ) is provided with a surge arrester 16, 18, 20 each electrically connected to ground from one of the respective phases. Instead, figure 2 A three-phase wye-connected transformer with three windings 10, 12, 14 is depicted provided with surge arresters 16, 18, 20 each connected from one of the respective phases to ground.

[0064] Although figure 1 with figure 2 The configurations shown in provide some protection for the transformer, but these configurations do not eliminate induced transient overvoltages that may be caused, for example, to energize or disconnect inductive loads or during transformer inrush current or transformer A short circuit on the second...

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Abstract

A system for transient over voltage protection of a three-phase transformer. Two surge arresters are series connected across each winding of the transformer and the center point connection of the two surge arresters is electrically connected to a middle location of the winding. Three additional surge arresters are electrically connected from each phase to ground in the case of either a delta or Y connected transformer; and / or connected from a neutral point to ground in the case of a Y connected transformer. The system allows for all of the surge arresters to be packaged as an integrated surge arrester system to minimize induced transient over voltages and high stresses on the transformer winding due to internal resonances.

Description

technical field [0001] The present system is dedicated to a transient overvoltage protection system for transformers, more specifically to a system for three-phase delta or wye connected transformers that suppresses overvoltages on transformer windings due to internal resonances Overvoltage protection system. Background technique [0002] Dry-type transformers are often used in medium voltage power systems, and vacuum circuit breakers are often used in connection with dry-type transformers. Vacuum circuit breakers may cause overvoltage conditions when used to operate transformers during certain conditions. These overvoltages can cause transformer insulation failure if transient overvoltage protection is not installed. Common transient overvoltage protection includes surge arresters and oil-filled surge capacitors and snubber surge capacitors (RC snubbers). [0003] One problem with the use of vacuum circuit breakers is the possibility of inductive transient overvoltages. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/34H02H9/00H01F27/40H02H9/04
CPCH01F27/343H01F27/40H02H9/005H02H9/04
Inventor E·林德尔L·利尔杰斯特兰德F·格瑞尤特
Owner HITACHI ENERGY LTD
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