4.39
Date Code 20150130 Instruction Manual SEL-787 Relay
Protection and Logic Functions
Basic Protection
The phase time-overcurrent elements, 51PnAT, 51PnBT, and 51PnCT, respond
to the A, B, and C-phase currents for winding n as shown in Figure 4.21.
Figure 4.21 Phase A, B, and C Time-Overcurrent Elements
Table 4.11 Winding n Phase A, B, and C Time-Overcurrent (n = 1 or 2)
(Sheet 1 of 2)
Setting Prompt Setting Range
Setting Name :=
Fac tory Defau lt
PHASE TOC LVL OFF, 0.50–16.00 A
a
0.10–3.20 A
b
51PnAP := OFF
PHASE TOC CURVE U1, U2, U3, U4, U5,
C1, C2, C3, C4, C5
51PnAC := U3
PHASE TOC TDIAL 0.50–15.00
c
0.05–1.00
d
51PnATD := 3.00
EM RESET DELAY Y, N 51PnARS := N
CONST TIME ADDER 0.00–1.00 sec 51PnACT := 0.00
MIN RESPONSE TIM 0.00–1.00 sec 51PnAMR := 0.00
PH A TOC TRQCTRL SEL
OGIC 51PnATC := 1
PHASE TOC LVL OFF, 0.50–16.00 A
a
0.10–3.20 A
b
51PnBP := OFF
PHASE TOC CURVE U1, U2, U3, U4, U5,
C1, C2, C3, C4, C5
51PnBC := U3
PHASE TOC TDIAL 0.50–15.00
c
0.05–1.00
d
51PnBTD := 3.00
EM RESET DELAY Y, N 51PnBRS := N
CONST TIME ADDER 0.00–1.00 sec 51PnBCT := 0.00
MIN RESPONSE TIM 0.00–1.00 sec 51PnBMR := 0.00
PH B TOC TRQCTRL SEL
OGIC 51PnBTC := 1
PHASE TOC LVL OFF, 0.50–16.00 A
a
0.10–3.20 A
b
51PnCP := OFF
PHASE TOC CURVE U1, U2, U3, U4, U5,
C1, C2, C3, C4, C5
51PnCC := U3
PHASE TOC TDIAL 0.50–15.00
c
0.05–1.00
d
51PnCTD := 3.00
51PnAP
|IAWn|
Setting
51PnATC
Torque Control Switch
SELOGIC
Torque Control
51PnAP Pickup
51PnAR Reset
51PnAT Curve
Timeout
51PnATC Torque Control
State Switch Position
Logical 1 Closed
Logical 0 Open
Setting
51PnARS = Reset Timing
Y Electromechanical
N 1 Cycle
Relay
Word
Bits
SELOGIC
Setting
(From Figure 4.14)
Note: n = 1 or 2 (Winding 1 or 2).
Shown for A Phase (phases B and C are similar).
51PnAT Phase
Time-Overcurrent Element
Curve Timing and Reset Timing
51PnAP Pickup
51PnAC Curve Type
51PnATD Time Dial
51PnARS Electromechanical
Reset? (Y/N)
51PnACT Const. Time Add.
51PnAMR Min. Response
Settings
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