Research and Application of Transformer-User Identification Technology Based On Fault Diagnosis of Electrical Information Acquisition Equipment

Abstract

The line loss rate of power supply enterprises is an important economic and technical index, which directly reflects the lean level of marketing professional management of power supply enterprises. At present, the confusion of transformer-user archives in transformer area is still widespread, which is a key issue in line loss management in power supply enterprises. As the downlink communication channel, low-voltage power line carrier can realize cross-station reading, which brings great difficulties to the identification of transformer-user relation. Because the data of calculating the line loss rate of the transformer area depends on the electrical information acquisition system, the running state of the electrical information acquisition equipment is also one of the important factors affecting the line loss rate of the transformer area. This paper will focus on the fault diagnosis technology of electrical information acquisition equipment, and use it to carry out the identification of transformer-user transformers.

Analysis and prospect of power transformer fault diagnosis technology

“…It is often manifested as the change in the axial and radial size of winding, body displacement, winding distortion, bulging, etc. Winding deformation is a major hidden danger in the stable operation of the transformer at present, and it is also the main reason for transformer damage failure at present; (5) In the transient process such as lightning impact, arc discharge to the ground, or even impact closing, insulation damage, and even breakdown may occur at the weak parts of the winding (such as the initial turns of the highvoltage winding, the end of the insulated wire, the connection of the series winding and the neutral point, etc.) ; ( 6) Serious continuous overload leads to the abnormal temperature rise of the transformer, resulting in brittleness and falling off of winding insulation, causing inter-turn short circuits of winding.…”

“…For instance, an examination of accident statistics involving generators of 110kV and above in the State Grid Corporation of China for the period spanning 2001 to 2005 reveals that transformer winding faults significantly contribute to the unplanned outages of 220 kV, 330 kV, and 500 kV transformers. A notable incident transpired on the evening of April 10, 2012, wherein extensive power interruptions afflicted Futian, Luohu, and Longgang Districts in Shenzhen, with some areas experiencing prolonged outages lasting several hours [5][6] [7] . Multiple areas of Shenzhen suffered from power outages, for which subsequent investigation unveiled that the root cause of this power outage was traced back to a fault in a 500kV transformer.…”