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I.L. 40-385.1B
FIGURE NO.
1-1.
MDAR Relay Assembly showing FT-14 Switch Covers ............................................................ 1-6
1-2
Layout of MDAR Modules within Inner and Outer Chassis ....................................................... 1-7
1-3
INCOM/PONI Communication Interface Device (photo) ........................................................... 1-8
1-4
Simplified Block Diagram of MDAR Relay................................................................................. 1-9
1-5
MDAR Relay Program Functions ............................................................................................ 1-10
2-1.
CO-2 Curve Characteristics ...................................................................................................... 2-4
2-2.
CO-5 Curve Characteristics ...................................................................................................... 2-5
2-3.
CO-6 Curve Characteristics ...................................................................................................... 2-6
2-4.
CO-7 Curve Characteristics ...................................................................................................... 2-7
2-5.
CO-8 Curve Characteristics ...................................................................................................... 2-8
2-6.
CO-9 Curve Characteristics ..................................................................................................... 2-9
2-7.
CO-11Curve Characteristics ................................................................................................... 2-10
2-8.
MDAR Outline Drawing ........................................................................................................... 2-11
3-1.
MDAR Characteristics/R-X Diagram ....................................................................................... 3-17
3-2.
Mho Characteristic for Phase-to-Ground Faults ...................................................................... 3-17
3-3.
Mho Characteristics for Three-Phase Faults (No Load Flow) ................................................. 3-18
3-4.
Mho Characteristics for Phase-to-Phase and Two-Phase-to-Ground
Faults (No Load Flow) ............................................................................................................. 3-18
3-5.
MDAR Zone-1 Trip Logic......................................................................................................... 3-19
3-6.
MDAR Zone-2 Trip Logic......................................................................................................... 3-19
3-7.
MDAR Zone-3 Trip Logic......................................................................................................... 3-20
3-8.
MDAR Zone-1 Extension Scheme .......................................................................................... 3-20
3-9.
Inverse Time Overcurrent Ground Backup Logic .................................................................... 3-21
3-10.
Loss of Potential Logic ............................................................................................................ 3-21
3-11.
Loss of Potential Logic (System Diagram) .............................................................................. 3-22
3-12.
AC Current Monitoring Logic ................................................................................................... 3-22
3-13.
Overcurrent Supervision.......................................................................................................... 3-23
3-14.
Instantaneous Overcurrent Highset Trip Logic........................................................................ 3-23
3-15.
MDAR Close-Into-Fault Trip (CIFT) Logic ............................................................................... 3-24
3-16.
MDAR Unequal-Pole-Closing Load Pickup Trip Logic ............................................................ 3-24
3-17.
Load Loss Accelerated Trip Logic ........................................................................................... 3-25
3-18a.
Out-of-Step Block Logic .......................................................................................................... 3-25
3-18b.
Out-of-Step Block Logic (Blinder Characteristic) ..................................................................... 3-25
3-19.
Reclosing Initiation Logic......................................................................................................... 3-26
3-20.
Single Pole Trip Logic ............................................................................................................. 3-26
3-21.
POTT/Unblocking Pilot Relay.................................................................................................. 3-27
3-22.
POTT/Unblocking Pilot Trip Logic ........................................................................................... 3-27
3-23.
Carrier Keying/Receiving Logic in POTT/Unblocking schemes .............................................. 3-28
3-24.
PUTT Keying Logic ................................................................................................................. 3-28
FIGURES
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PAGE
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