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338
Monitoring of AC analog measurements
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Fast, reliable supervision of different analog quantities is of vital importance during the
normal operation of a power system.
Operators in the control centres can, for example:
•
Continuously follow active and reactive power flow in the network
•
Supervise the busbar voltage and frequency
Different measuring methods are available for different quantities. Current and voltage
instrument transformers provide the basic information on measured phase currents and
voltages in different points within the power system. At the same time, currents and
voltages serve as the input measuring quantities to power and energy meters, protective
devices and so on.
Further processing of this information occurs within different control, protection, and
monitoring terminals and within the higher hierarchical systems in the secondary power
system.
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The REx 5xx protection, control, and monitoring terminals have as basic the function-
ality to measure and further process information about up to five input currents and five
input voltages. The number of processed alternate measuring quantities depends on the
type of terminal and built-in options.
REO 517 is a member in the REx 5xx-series that can be ordered in single or two phase
versions. Additional information is available, which depends of the number of phases:
•
Mean values of measured currents I in current channels (1st or 1st and 2nd).
•
Mean values of measured voltages U in voltage channels (1st or 1st and 2nd).
•
Total active power P as measured by current and voltage measuring channels men-
tioned above.
•
Total reactive power Q as measured by current and voltage measuring channels.
•
Total apparent power S as measured by current and voltage measuring channels.
•
Mean frequency f as measured by voltage channels (1st or 1st and 2nd).
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