calculations considering different operational states as well as time delay co-
ordination with other protections in the system. As a second protection a residual
voltage protection is often used.
•
Failure of the circuit beaker to interrupt fault current after protection trip. The breaker
failure protection function is essential in a protection system using local redundancy.
•
Autoreclosing is normally used on power lines as most faults are transient, that is the
arcing fault will extinguish after a short zero voltage interval.
•
Enabled: It is recommended to have the function activated in the application
•
Disabled: It is recommended to have the function deactivated in the application
•
Application dependent : The decision to have the function activated or not is
dependent on the specific conditions in each case
Application 1 and Application 2 in table
examples given in previous sections.
Table 1:
Functionality table
Function
Application 1
Application 2
Instantaneous phase overcurrent protection ,
3-phase output PHPIOC (50)
Enabled
Enabled
Four step phase overcurrent protection, 3-
phase output OC4PTOC (51_67)
Enabled
Enabled
Instantaneous residual overcurrent
protection EFPIOC(50N)
Enabled
Disabled
Four step residual overcurrent protection
EF4PTOC (51N_67N)
Enabled
Disabled
Sensitive directional residual overcurrent and
power protection SDEPSDE (67N)
Disabled
Enabled
Thermal overload protection, one time
constant, Fahrenheit LFPTTR/LCPTTR (26)
Fahrenheit/Celsius
Application dependent
Application dependent
Application dependent
Breaker failure protection, 3-phase activation
and output CCRBRF (50BF)
Enabled
Enabled
Pole discordance protection CCRPLD (52PD) Application dependent
Application dependent
Broken conductor check BRCPTOC (46)
Application dependent
Application dependent
Directional under-power protection
GUPPDUP (37)
Application dependent
Application dependent
Table continues on next page
Section 2
1MRK 511 286-UUS A
Application
34
Application manual
Summary of Contents for REC650 ANSI
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