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ANSI保护编码

ANSI保护编码
ANSI保护编码

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.

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