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Monitoring of transformers including tap changers

A technology of tap changer and tap change, which is applied in variable transformers, transformers, transformer testing, etc., can solve problems such as transformer health difficulties, and achieve the effect of reliable maintenance planning and additional hardware avoidance

Active Publication Date: 2020-01-21
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From this it can be seen that it can be very difficult to determine the health of a transformer using the available waveforms

Method used

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  • Monitoring of transformers including tap changers
  • Monitoring of transformers including tap changers
  • Monitoring of transformers including tap changers

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Experimental program
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Embodiment Construction

[0044] Hereinafter, a detailed description of preferred embodiments of the present invention will be given.

[0045] figure 1A transformer 10 is shown having a first winding 12 and a second winding 14 magnetically coupled to each other. These windings thus form a pair of windings, usually denoted primary and secondary. Furthermore, the first winding 12 is connected to a tap changer 16 . In the figures, a number of power transfer characteristics of the transformer that can be measured during operation are also shown. There is an input current In fed into the first winding 12 and an input voltage Uin applied across the first winding 12 . There is also an output current Iout delivered from the second winding 14 and an output voltage Uout provided by the second winding 14 . The input current In and the input voltage Uin are measured quantities measured at the first measurement terminal MT1 and the second measurement terminal MT2 of the first winding 12, wherein the first measu...

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Abstract

The invention relates to a monitoring device, method and computer program product for monitoring a transformer comprising a tap changer. The transformer has at least two magnetically coupled windings and a tap changer including impedance elements and a changeover switch configured to gradually through the impedance element. The method is performed in the monitoring device and includes obtaining (50) recorded waveforms of measured power transfer characteristics at the first transformer side and the second transformer side, processing (52, 54, 56) the recorded waveforms to for obtaining at least one waveform (Ploss) representative of a tap change operation, and extracting (56, 60) information indicative of performance of the tap change from the at least one waveform representative of the tap change operation.

Description

technical field [0001] The invention relates to a monitoring device, method and computer program product for monitoring a transformer comprising a tap changer. Background technique [0002] Transformers equipped with tap changers are frequently used in different types of power transmission environments, such as at 10 kV and above. Transformers that include tap changers are able to change the turns ratio between windings and thus change the voltage level. This capability exists in many systems for controlling power delivery. [0003] Transformers are generally reliable. They have a low probability of failure, such as about 1%. However, of those 1% of transformers that fail, typically 20% to 40% are due to tap changer failure. [0004] The reason for this is that the tap changer is the only part of the transformer that has mechanically moving elements. Therefore, this part of the transformer is more likely to cause failure than the rest of the transformer. [0005] There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/055H01F29/02
CPCH01F29/02H02H7/055G01R31/62H01F38/14
Inventor T·本特森N·阿贝维克拉玛
Owner HITACHI ENERGY SWITZERLAND AG