Device and method for measuring transformer energy efficiency based on voltage difference and current difference

Abstract

The invention provides a device and method for measuring energy efficiency of a transformer based on a voltage difference value and a current difference value, and relates to the field of power measurement and energy efficiency measurement. The device and method aim to improve energy efficiency measurement precision. According to the method, the magnitude difference of measured power is reduced by using the voltage difference value and the current difference value, and through appropriate circuit conversion, the loss power of the measured transformer is measured by changing the difference value of the input power and the output power into the sum of two types of relatively small power. According to the measurement method, measurement of the difference value of two relatively large electric quantities can be converted into measurement of the sum of two relatively small electric quantities, and therefore the measurement precision is improved. The method can be used for measuring the energy efficiency when the transformer is in an operating state, and compared with offline detection of the transformer, wide application prospects are achieved. The measured transformer involved in the device and method can be a single-phase transformer or a three-phase transformer.

Description

technical field [0001] The invention belongs to the field of electricity, and in particular relates to a device and method for measuring transformer energy efficiency based on voltage difference and current difference. Background technique [0002] Transformer is one of the main equipment in power system. The level of transformer energy transmission efficiency is an important part of the energy efficiency of the entire power system. The energy loss on the transformer has caused the economic loss of the power supply company and the electricity user. Improving the energy efficiency of transformers is the direction of long-term efforts of experts in the international power field. Accurate detection of transformer energy efficiency is the basis for monitoring transformer energy efficiency. After the transformer is produced from the factory, it needs to be inspected at the factory; after it is put into operation, it also needs to be routinely inspected at regular intervals. T...

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Problems solved by technology

[0005] Another object of the present invention is to solve the technical problems existing in the prior art; provide a mathematical operation such as difference or summation, multiplication and division of the unmeasured voltage and current to be measured, which is difficult to measure, into an easy-to-measure and / or Other electrical quantities that are easy to measure, change the actual measurement object when the final measurement object is consistent, and reduce the difficulty of the experiment. A device and method for measuring transformer energy efficiency based on voltage difference and current difference

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