Abstract
This paper presents the initial implementation of cyberphysical testbed for Advanced Distribution Management System (ADMS). The testbed is used for cybersecurity assessment of smart power distribution network operation use case of TSO-DSO coordinated reactive power management. The test in our National Smart grid Laboratory (NSGL) demonstrates the impact of a cyber security attack on the operation of the physical power distribution network where intruders alter the voltage reference signals communicated from the control room to the On-load tap changer (OLTC) in the field. This paper highlights the use of laboratory ADMS testbeds for scientifically assessing operational benefits and cyber security vulnerabilities.