Title: Method for raising measuring precision of microcomputer protective relay device
Application Number: 200610112773 Application Date: 2006.09.01
Publication Number: 1917323 Publication Date: 2007.02.21
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02H7/26
Applicant(s) Name: Tsinghua Univ. Address:
Inventor(s) Name: Ji Yindong;Sun Xinya;Jin Wenguang;Qian Limin;Li Yi
Attorney & Agent:
Abstract:
    Characters of the invention are that using divider circuit implements protection in two segments corresponding to large and small measured current for the protection current in order to raise precision; carrying out seamless fitting for data sampled from same protection current in segments; according to rated value and actual value, software layer carries out correction of amplitude and correction of phase for each channel of protection current at same time. The invention reflects real change of each protected electric quantity correctly. Thus, based on the said real change to carry out correction, the invention raises precision of measurement.
Time: 10