Sel 551 - Page 10

viii List of Figures
SEL-551 Relay Instruction Manual Date Code 20110408
Figure 4.1 U.S. Moderately Inverse Curve: U1 .......................................................................................4.4
Figure 4.2 U.S. Inverse Curve: U2...........................................................................................................4.5
Figure 4.3 U.S. Very Inverse Curve: U3..................................................................................................4.6
Figure 4.4 U.S. Extremely Inverse Curve: U4.........................................................................................4.7
Figure 4.5 U.S. Short-Time Inverse Curve: U5 .......................................................................................4.8
Figure 4.6 IEC Class A Curve (Standard Inverse): C1............................................................................4.9
Figure 4.7 IEC Class B Curve (Very Inverse): C2 ................................................................................4.10
Figure 4.8 IEC Class C Curve (Extremely Inverse): C3........................................................................4.11
Figure 4.9 IEC Long-Time Inverse Curve: C4 ......................................................................................4.12
Figure 4.10 IEC Short-Time Inverse Curve: C5......................................................................................4.13
Figure 5.1 Nine-Pin Serial Communications Port Connector..................................................................5.1
Figure 6.1 SEL-551 Front-Panel Pushbuttons—Overview......................................................................6.1
Figure 6.2 SEL-551 Front-Panel Pushbuttons—Primary Functions........................................................6.2
Figure 6.3 SEL-551 Front-Panel Pushbuttons-Primary Functions (continued) .......................................6.3
Figure 6.4 SEL-551 Front-Panel Pushbuttons-Secondary Functions.......................................................6.4
Figure 6.5 Local Control Switch Configured as an ON/OFF Switch ......................................................6.7
Figure 6.6 Local Control Switch Configured as an OFF/MOMENTARY Switch ..................................6.7
Figure 6.7 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch............................6.7
Figure 7.1 Example Event Summary .......................................................................................................7.3
Figure 7.2 Example SEL-551 Standard 15-Cycle Event Report (1/8-Cycle Resolution)......................7.14
Figure 7.3 Derivation of Event Report Current Values and RMS Current Values From Sampled
Current Waveform ............................................................................................................7.15
Figure 7.4 Derivation of Phasor RMS Current Values From Event Report Current Values ..................7.16
Figure 7.5 Example Sequential Events Recorder (SER) Event Report .................................................7.17
Figure 8.1 Low-Level Test Interface ........................................................................................................8.2
Figure 8.2 Relay Part Number and Hardware Identification Sticker .......................................................8.5
Figure 8.3 Test Connections for Balanced Load With Three-Phase Current Sources .............................8.9
Figure 8.4 Test Connections for Balanced Load With Two-Phase Current Sources................................8.9
Figure B.1 EPROM Socket...................................................................................................................... B.2
Figure B.2 Insertion of the Extraction Tool in the EPROM Socket ........................................................ B.3
Figure B.3 Proper Orientation of the EPROM and EPROM Socket ....................................................... B.3
Figure F.1 Minimum Response Time Added to a Negative-Sequence Time-Overcurrent Element........F.2
Figure F.2 Distribution Feeder Protective Devices .................................................................................. F.3
Figure F.3 Traditional Phase Coordination ..............................................................................................F.4
Figure F.4 Phase-to-Phase Fault Coordination......................................................................................... F.5
Figure F.5 Negative-Sequence Overcurrent Element Derived From “Equivalent” Phase
Overcurrent Element, 51EP ................................................................................................F.6