  Power systems become more prone to cyber-attacks due to the high integration
of information technologies. In this paper, we demonstrate that the outages of
some lines can be masked by injecting false data into a set of measurements.
The success of the topology attack can be guaranteed by making that: 1)the
injected false data obeys KCL and KVL to avoid being detected by the bad data
detection program in the state estimation; 2)the residual is increased such
that the line outage cannot be detected by PMU data. A quadratic programming
problem is set up to determine the optimal attack vector that can maximize the
residual of the outaged line. The IEEE 39-bus system is used to demonstrate the
masking scheme.
