
I.L. 40-386.3
3-2
(10/94)
• One inverse overcurrent ground unit with CO characteristics
(see Figures 2-32
through 2-38)
for ground backup:
Pickup (0.5 - 4.0) in 0.1 A steps for 5 A (ct type).
Choice of 7 time-curve families (CO-2, 5, 6, 7, 8, 9, 11 Characteristics), 63 curves
per family.
Set for directional or non-directional operation.
(Pickup (0.1 - 2.0) in 0.1 A steps for 1 A (ct type).)
• One forward set instantaneous directional overcurrent ground unit. (REL 302 only,
Pilot-high resistance ground faults, supervised by I
CM
).)
• One reverse set instantaneous directional overcurrent ground unit. (REL 302 only,
Carrier Start, Weakfeed and Transient Block Logic, supervised by IOS.)
UNDERVOLTAGE MEASUREMENTS
• Three under-voltage units (L
VA
, L
VB
, L
VC
) for Close-Into-Fault, Loss of Potential and
Weakfeed Trip (REL 302 only) supervision with one setting (Low V).
40 to 60 Vrms in 1 - Volt steps.
OHMS PER UNIT DISTANCE (x / Dist)
• For fault locator measurement
0.300 - 1.500 in 0.001 Ohms per Distance Unit (Kilometers or Miles) in primary
ohms.
OUT-OF-STEP BLOCK (OS Block)
• OUT-OF-STEP BLOCK Override Timer
400 - 4000 ms in 16 ms steps
• OUT-OF-STEP BLOCK Inner Blinder (RT)
1.0 - 15.0 Ohms in 0.1 Ohm steps
NOTE:
The inner blinder (RT) is a required setting since it is used as a load
restriction blinder even when OUT-OF-STEP BLOCK is not used.
• OUT-OF-STEP BLOCK Outer Blinder (RU)
3.0 - 15.0 Ohms in 0.1 Ohm steps
3.2.
CALCULATION OF REL 301/302 SETTINGS
The following REL 301/302 setting calculations correspond to the setting categories
in the Installation Section (4). Assume that the protected line has the following data:
• 18.27 miles
• Line reactance 0.8 ohms/mile
• 69 kV, 60 cycles
• Positive and negative sequence impedances:
• ZIL (Pri) = Z2L (Pri) = 15
∠
77
°
ohms
Содержание REL 301
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Страница 17: ...I L 40 386 3 1 10 10 94 2682F39 Sheet 1 of 2 Sub 2 Figure 1 2 REL 301 302 Layout Vertical...
Страница 18: ...I L 40 386 3 10 94 1 11 2682F39 Sheet 2 of 2 Sub 2 Figure 1 3 REL 301 302 Layout Horizontal...
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Страница 61: ...I L 40 386 3 2 40 10 94 1501B84 Sub 6 Figure 2 31 Reversible Zone3 Phase and Ground Reverse Block Logic...
Страница 62: ...I L 40 386 3 10 94 2 41 Figure 2 32 CO 2 Curve Characteristics 619596 Sub 2...
Страница 63: ...I L 40 386 3 2 42 10 94 Figure 2 33 CO 5 Curve Characteristic 619597 Sub 2...
Страница 64: ...I L 40 386 3 10 94 2 43 Figure 2 34 CO 6 Curve Characteristic 619598 Sub 2...
Страница 65: ...I L 40 386 3 2 44 10 94 Figure 2 35 CO 7 Curve Characteristic 619599 Sub 2...
Страница 66: ...I L 40 386 3 10 94 2 45 Figure 2 36 CO 8 Curve Characteristic 619600 Sub 2...
Страница 67: ...I L 40 386 3 2 46 10 94 Figure 2 37 CO 9 Curve Characteristic 619601 Sub 2...
Страница 68: ...I L 40 386 3 10 94 2 47 Figure 2 38 CO 11 Curve Characteristic 619602 Sub 2...
Страница 126: ...I L 40 386 3 10 94 5 19 Figure 5 3 Microprocessor Module JP6 JP5 JP3 JP4 Clock Battery 1613C55 Sheet 3 of 3 Sub 6...