Research On 110kV Conventional Substation CT, PT Secondary Side Two Polar Intelligent Detection Technology

In power system, voltage transformer (PT), current transformer (CT) is one of the most important electrical equipment, two secondary side power transformer polarity is correct or not directly related to the correct operation of the power system two times in the low-pressure system measurement and protection equipment, two side so the power transformer polarity plays a very important role for the whole power system, which is the focus of this research.According to the principle of power transformers, the article first four-star three-phase voltage transformer secondary polar 110kV substation analyze this detection method is mainly through the primary side of the pulse voltage power transformer testing, introduction test system on the primary side and secondary side pulse power handheld terminals, and the secondary-side terminal data acquisition modules are Multisum simulation, and finally in the scene of the reliability test, the test correctly three-phase four-star-type voltage transformer polarity of the secondary side.Because the three-phase four-star-voltage transformer secondary polarity test system limitations, can not be detected by current transformer polarity can not be in the 110kV substation transformer secondary circuit for all testing, so this article Based on the development of the 110kV substation power transformer polarity intelligent detection system, which is the main research direction, the intelligent detection method is divided into two parts, the primary and secondary excitation power handheld terminals, and three-phase four compared to the star voltage transformer polarity test method, the main difference is:excitation power of the detection method of sinusoidal signal on the secondary side of the hand-held terminal signal acquisition has been processed so that the data collected can adapt to a more complex situation.110kV substation power transformer polarity intelligent detection system using wireless module operation, can realize remote test, test compared with traditional method, the detection system can not only test the two secondary side circuit is correct, but also be able to give the final settlement, which makes the whole detection more intelligent and convenient.