FUNCTION DESCRIPTIONANSI
IED :Protection of line 1 (PL1) and 2 (PL2)
Differential line87L
Distance 21 / 21N
Phase overcurrent 50/51
Neutral overcurrent50 N/51 N
Overvoltage59
Low voltage27
Directional overcurrent of phases and neutral 67 / 67N
FUNCTION DESCRIPTIONANSI
IED : Protection of Line 1 (PL1) and 2 (PL2)
Lock fuse failure97
Lock power oscillation68
Teleprotection / Teleprotection schemes 85
Location and fault monitoring LF
Automatic reclosing 79
Switch fault50BF
Synchronism verification 25
Broken Conductor
Load detection
Residual compensation factor
Logic ofclosure failure(SOTF)
ECO and weak infeed
Discrepancy of poles
Trigger logic
Lock for failures of parallel line
Dead line detection
Failure record
Monitoring functions of trigger circuit(74) and trigger blocking(86) that may be implementedbyseparate devices.
FUNCTION DESCRIPTIONANSI
IED : Protection of Autotransformer 1 (PAT1) and 2 (PAT2)
Percentage differential of transformer 87T
Phase overcurrent50/51
Neutral overcurrent50N/51N
Ground overcurrent50G/51G
Overexcitation24
Synchronism verification 25
Switch fault50BF
Zero sequence overvoltage 64
Failure record
Also it will have the followingfunctionsfor control and monitoringof thebayswitch: monitoring functions of trigger circuit(74) andtriggerblocking(86), which may be implementedbyseparate devices.
FUNCTION DESCRIPTIONANSI
IED : Protection of Reactor 1 (PRL1) and 2 (PRL2)
Percentage differential of reactor87R-1
Phase overcurrent 50/51
Neutral overcurrent 50N/51N
Ground overcurrent 50G/51G
Failure record
Trigger logic(*)
(*)Fora failure in thereactor, theprotectionmust send atrigger signal to thelineswitch and alsothe remote endof the line, throughthe same DTT signalused bydistance protections.
FUNCTION DESCRIPTIONANSI
IED : Protection of bar reactor 1 (PRB1) and 2 (PRB2)
Percentage differential of reactor87R-1
Phase overcurrent 50/51
Neutral overcurrent 50N/51N
Low voltage 27
Overvoltage59
Switch failure50BF
Failure record
Itwill have the followingfunctionsfor control and monitoringof thebayswitch: monitoring functions of trigger circuit(74) andtriggerblocking(86), which may be implementedbyseparate devices. FUNCTION DESCRIPTION ANSI
IED : Protection of bars (PB1)
Percentage differential of bars87B-1
Failure record
? Protection IEDscoupling bars to 500 kV.
ProtectionIEDs of couplingbarwill have at leastthe followingprotection functions:
FUNCTION DESCRIPTION ANSI
IED :Coupling of bars
Phase overcurrent 50/51
Neutral overcurrent50N/51N
Synchronism verification 25
Switch failure50BF
Failure record
Also it will have the followingfunctionsfor control and monitoringof the coupling of bar switch: monitoring functions of trigger circuit (74) andtriggerblocking(86)thatcould be generated byseparate devices.