Some applications of phasor measurements to adaptive protection

Journal Article · Sun May 01 04:00:00 EDT 1988 · IEEE Trans. Power Syst.; (United States)

DOI:https://doi.org/10.1109/59.192936· OSTI ID:6419310

Thorp, J S; Phadke, A G; Horowitz, S H; Begovic, M M

The application of microprocessor based phasor measurements to new adaptive protection schemes is presented. The concepts of digital adaptive protection in which relay characteristics are modified in response to external signals and conditions in the system are examined. The importance of real-time phasor measurements in adaptive protection systems is illustrated by two examples. The first involves obtaining synchronizing information about phasor measurements too be used in a new type of current differential protection for a multiterminal line. by estimating the reference angles for the phasor measurements the effect of synchronized sampling can be obtained without the expense of synchronizing equipment. The second use of phasor measurements in adaptive protection is the adaptive setting of out-of-step blocking and tripping. Traditional problems of setting out-of-step blocking and tripping are caused because the settings are, of necessity, compromises based on off-line studies. By reacting to real-time phasor measurements from selected buses in interconnection it is shown that improved out-of-step blocking and tripping is possible.

• Research Organization: Cornell Univ., Ithaca, NY (US)
• OSTI ID: 6419310
• Journal Information: IEEE Trans. Power Syst.; (United States), Journal Name: IEEE Trans. Power Syst.; (United States) Vol. 3:2; ISSN ITPSE
• Country of Publication: United States
• Language: English

Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
42 ENGINEERING
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL SYSTEMS
DIGITAL SYSTEMS
ELECTRONIC CIRCUITS
ENERGY SYSTEMS
EQUIPMENT PROTECTION DEVICES
FUNCTIONS
MEASURING METHODS
MICROELECTRONIC CIRCUITS
MICROPROCESSORS
POWER SYSTEMS
REAL TIME SYSTEMS
RESPONSE FUNCTIONS
SYNCHRONIZATION