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Tap changer monitoring

A technology of taps and switchers, applied in the direction of instruments, inductors, transformers, etc., can solve problems such as false signals, difficult to explain graphics, interference, etc.

Inactive Publication Date: 2006-03-29
ABB POWER GRIDS SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such acoustic measurements require specialized equipment and often involve problems due to resonances, spurious signals, interference, etc.
Also, the graphs obtained from acoustic measurements are very difficult to interpret, especially since each system has its own acoustic properties

Method used

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Examples

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Embodiment Construction

[0024] The same reference numerals are used throughout the figures to designate like or corresponding items.

[0025] Figure 1 is a schematic diagram of a transformer with a tap changer system that can be used in the present invention. The figure shows a transformer box 10 including a tap changer 12 . The tap changer 12 shown is suspended from the transformer roof 14 , however other tap changers 12 may be provided outside the transformer box 10 . Both the transformer tank 10 and the tap changer 12 are filled with an insulating liquid, preferably oil, which is stored in an oil conservator 16 . To avoid contaminating the oil in the transformer by arcing, for example as will be described with reference to Figure 3, the tap changer 12 has a hermetic enclosure for separating its insulating liquid from that of the transformer. Power for operating the tap changer 12 is provided by a motor drive mechanism 18 mounted on the exterior of the transformer box 10 . Power is transmitted v...

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PUM

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Abstract

A method and means for diagnosing transformer tap changers is provided. Pressure is monitored in an insulating liquid of a tap changer for a period of time in which switching of the tap changer is carried through. Switching-related information is then extracted from the pressure diagram. The method, preferably used for single-phase tap changers, comprises the step of relating quantities from pressure peaks to specific arcings of the switching sequence. Early error detection is achieved, whereby transformed failures may be avoided. Repeated measurements ae followed by trend evaluation. If a trend indicating tap changer problems is detected, an alarm signal is triggered. The invention may include switching off the transformer if the pressure exceeds a predetermined emergency value as well as extracting information of the base pressure in the tap changer and converting it to level of insulating liquid.

Description

technical field [0001] The present invention relates generally to tap changers, and more particularly, the present invention relates to methods and apparatus for diagnosing the status of tap changers. Background technique [0002] High and medium voltage transformers are widely used in today's power distribution. These transformers use the magnetic properties of electric current to transfer power between two or more incompatible AC circuits. So, electricity from a power plant is sent through a small current at a very high voltage, then reduced to a high current at a low voltage, and finally reaches the consumer. [0003] Electricity utilities are responsible for keeping the supply voltage within certain limits for their customers. A tap changer is a device used in transformers to regulate the output voltage of the transformer within these limits. Typically, this is accomplished by changing the number of turns in one winding of the appropriate transformer to change the tra...

Claims

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Application Information

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IPC IPC(8): G01R31/327G01R31/06G01R31/333H01F29/04
CPCH01H2009/0061G01R31/333H01F29/04G01R31/3274G01R31/027G01R31/62
Inventor B·-O·斯特内斯塔姆G·安德松
Owner ABB POWER GRIDS SWITZERLAND AG
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