Abstract
The most important elements of “intellectual networks” (Smart Grid) are the systems of monitoring the parameters of electrical equipment. Information-measuring systems (IMS), which described in this paper, were proposed to use together with rapid digital protection against short-circuit regimes in transformer windings. This paper presents an application’s experience of LVI-testing, some results of the use of Frequency Response Analysis (FRA) to check the condition of transformer windings and infra-red control results of electrical equipment. The LVI method and short-circuit inductive reactance measurements are sensitive for detecting such faults as radial, axial winding deformations, a twisting of low-voltage or regulating winding, a losing of winding’s pressing and others.
Highlights
Joint Stock Company “Federal Grid Company of United Energy System” is the operator of the United National Electrical Network of Russia
Information-measuring systems (IMS), which described in this paper, were proposed to use together with rapid digital protection against short-circuit regimes in transformer windings
This paper presents an application’s experience of low voltage impulse (LVI)-testing, some results of the use of Frequency Response Analysis (FRA) to check the condition of transformer windings and infra-red control results of electrical equipment
Summary
Joint Stock Company “Federal Grid Company of United Energy System” is the operator of the United National Electrical Network of Russia. The residual winding’s deformations of power transformers during short circuits will appear practically instantly, without leaving time to analysis the results of the diagnostic measurements, and requiring as it is possible to rapidly switch off, with the purpose of averting or reducing repairing of electrical equipment in the future. 4. Short-Circuit Testing of Power Transformers and LVI Method for Detecting Transformer’s Winding Deformations. LVI-testing, FRA and short-circuit inductive reactance measurements are sensitive to detecting such transformers winding faults as buckling, axial shift and others. The application of LVI method and measurement of inductive reactance deviation allowed to detect a twisting of low-voltage winding and radial winding’s deformations at tests of the 400 MVA and a 250 MVA block power transformers [4,5,6,7,8,9]. Deformations of turns were detected at the electrodynamic tests of 666 MVA power transformer for the Hydroelectric Power Station
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