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1、 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 (PL
2、1) 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 a
3、nd 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
4、) and 2 (PAT2) Percentage differential of transformer 87T Phase overcurrent50/51 Neutral overcurrent50N/51N Ground overcurrent50G/51G Overexcitation24 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 3 页 - - - - - - - - - Synchronism verification 25 Switch fault5
5、0BF 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 (P
6、RL1) 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, throughth
7、e 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 follo
8、wingfunctionsfor 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
9、 bars to 500 kV. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 3 页 - - - - - - - - - ProtectionIEDs of couplingbarwill have at leastthe followingprotection functions: FUNCTION DESCRIPTION ANSI IED :Coupling of bars Phase overcurrent 50/51 Neutral overcurrent50
10、N/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. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 3 页 - - - - - - - - -