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Zhang B.,Henan Electrical Power Transmission and Transformation Construction Corporation | Yao L.-N.,Zhengzhou University of Light Industry | Wang Y.,Henan Electrical Power Transmission and Transformation Construction Corporation | Wang G.-D.,Henan Electrical Power Transmission and Transformation Construction Corporation | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

The practical and easy method to verify the polarity of the electronic transformer is studied in the smart substation commissioning. The analog quantity is output by relay tester in the experiment of the electronic current transformer up-current. The angle of the secondary current of the up-current transformer and the angle of SMV are measured based on the frequency analog quantity. Based on the data acquired and the parameter of the equipment, the angle difference between the primary current and the secondary output of the electronic current transformer is counted. Then the secondary polarity of electronic current transformer is confirmed. The polarity of electronic voltage transformer can be confirmed in the experiment of applied voltage test. It is similar to the method of the electronic current transformer. The practice shows that the proposed method is feasible and efficient.


Yao L.-N.,Zhengzhou University of Light Industry | Liu H.,Henan Electrical Power Transmission and Transformation Construction Corporation | Zhang B.,Henan Electrical Power Transmission and Transformation Construction Corporation | Zhou Y.-H.,Henan Electrical Power Transmission and Transformation Construction Corporation | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

The protective devices of the 500 kV EHV grid are very complex. The upgrading and changing of line protection involve many running equipments and the corresponding secondary lines. Based on the experience of the 500 kV line protection upgrading and changing in the past few years, the danger in it is analyzed. The security precautions of sealing running terminal block, exiting protection board, disconnecting the power of protection device in the DC screen, etc, are made. The DC ground, short circuit and false startup failure protection jumping running lines, transformer and bus are avoided. The upgrading and changing of 500 kV line protection are ensured to go well. The discussion is of important significance for the future similar work.

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