Intelligent substation relay protection method based on double AD sampling

• Main Authors: LYU LIJUAN, ZHAO XIAODUO, XI YINGYING, DENG MAOJUN, MA HEKE, YAO DONGXIAO, HU SHASHA, XIAO FENG, NI CHUANKUN
• Format: Patent
• Language: English
• Published: 11.03.2015
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention relates to an intelligent substation relay protection method based on double AD sampling and belongs to the technical field of relay protection of electric power systems. The intelligent substation relay protection method based on double AD sampling includes that leading double AD sampling data output from a voltage or current merging unit into a protection device, wherein one path of sampling data is used for protecting logic operation while the other path of sampling data is used for protecting the logic operation starting, judging the consistency between the double AD sampling data according to the relative deviation and absolute deviation between the two paths of double AD sampling data, if the double AD sampling data are inconsistent, closing a protection outlet related to the analog quantity so as to realize the intelligent substation relay protection. The intelligent substation relay protection method based on double AD sampling avoids the double AD sampling error, has high sensitivity and is capable of improving the protection reliability and protecting trip signals from output when the double AD sampling data are inconsistent.