How to ensure the safe operation of Electrical Current Transformer
Jun 17, 2021| Electrical Current Transformer has similar requirements to voltage transformers in terms of product selection, testing before commissioning, sealing modification, and oil injection. In addition, we also need to master some explosion prevention measures for Electrical Current Transformer. First, check whether the lead joints in the primary terminals of the transformer are in good contact.
The lead joints of the primary terminals of the Electrical Current Transformer should be in good contact and the contact area should be kept sufficient to prevent the Electrical Current Transformer from overheating failures. The L2 terminal and the expander cover should be connected to the same potential to prevent potential suspension. In addition, there should be anti-rotation measures for the crucible drawn from the secondary line to prevent the internal lead from twisting due to external operations.
When the dielectric loss measured before and during the operation of the Electrical Current Transformer is abnormal in value, it should be comprehensively analyzed with the obvious change in temperature or the test voltage has risen from 10kv to Um/root 3, and the increment exceeds ±0.3%. run. When the result of chromatographic analysis is abnormal, it is necessary to follow a comprehensive analysis to investigate its growth trend. If the data grows rapidly, attention should be paid.
In order to avoid the breakdown of the capacitor core at the bottom of the Electrical Current Transformer to expand the scope of the accident, attention should be paid to the installation direction of the primary terminals L1 and L2 and the polarity connection of the secondary windings to ensure the normal operation of the busbar differential protection. run. According to the development of the power grid, pay attention to checking and calculating the short-circuit current at the location of the Electrical Current Transformer. When it exceeds the dynamic thermal stability current value of the transformer nameplate, it should be replaced in time.