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3 Operation Theory
PCS-9611 Feeder Relay
3-5
Date: 2014-04-08
relevant settings can enable or disable the corresponding protection.
The stage 1, 2, 5 and 6 overcurrent protections only have definite time characteristics. The stage
3 and 4 overcurrent protections can be set as either definite time (DT) or inverse definite minimum
time (IDMT). If the settings [50/51P3.Opt_Curve] and [50/51P4.Opt_Curve] are set as
“0”, the
stage 3 and 4 overcurrent protections can be with definite time characteristics.
The demonstration characteristic figure of the DT overcurrent protection and IDMT overcurrent
protection is shown as below.
t
Delay
50/51P2.I_Set
I
nom
50/51P1.I_Set
50/51P2.t_Op
50/51P1.t_Op
t
Delay
I
nom
DT OC
IDMT OC
Figure 3.3-1 Demonstration characteristic of the overcurrent protection
The logic diagram of the stage 1 overcurrent protection is shown in
. The overcurrent
block is a level detector that detects whether the current magnitude is above the threshold.
[50/51P1.Op]
[50/51P1.St]
[50/51P1.En1]
[50/51P1.En]
[50/51P1.Blk]
&
Ia > [50/51P1.I_Set]
&
50/51P1.Dir_A
50/51P1.VCE_A
50/51P1.HmBlk_A
Ib > [50/51P1.I_Set]
&
50/51P1.Dir_B
50/51P1.VCE_B
50/51P1.HmBlk_B
Ic > [50/51P1.I_Set]
&
50/51P1.Dir_C
50/51P1.VCE_C
50/51P1.HmBlk_C
t
OC1
0
Figure 3.3-2 Logic diagram of the stage 1 overcurrent protection
Where:
[50/51P1.I_Set] is the current setting of the stage 1 overcurrent protection;
“t
OC1
” is the setting [50/51P1.t_Op], the time setting of the stage 1 overcurrent protection;
[50/51P1.En] is the logic setting of the stage 1 overcurrent protection;
[50/51P1.En1] is the binary signal for enabling the stage 1 overcurrent protection;
[50/51P1.Blk] is the binary signal for blocking the stage 1 overcurrent protection;
Содержание PCS-9611
Страница 1: ...PCS 9611 Feeder Relay Instruction Manual NR Electric Co Ltd...
Страница 2: ......
Страница 10: ...1 Introduction PCS 9611 Feeder Relay 1 b Date 2014 04 08...
Страница 30: ...2 Technical Data PCS 9611 Feeder Relay 2 14 Date 2014 04 08...
Страница 36: ...3 Operation Theory PCS 9611 Feeder Relay 3 f Date 2014 04 08...
Страница 108: ...4 Supervision PCS 9611 Feeder Relay 4 b Date 2014 04 08...
Страница 116: ...5 Management Function PCS 9611 Feeder Relay 5 b Date 2014 04 08...
Страница 120: ...5 Management Function PCS 9611 Feeder Relay 5 4 Date 2014 04 08...
Страница 218: ...9 Configurable Function PCS 9611 Feeder Relay 9 b Date 2014 04 08...
Страница 232: ...9 Configurable Function PCS 9611 Feeder Relay 9 14 Date 2014 04 08...
Страница 262: ...11 Installation PCS 9611 Feeder Relay 11 b Date 2014 04 08...
Страница 272: ...12 Commissioning PCS 9611 Feeder Relay 12 b Date 2014 04 08...
Страница 292: ...13 Maintenance PCS 9611 Feeder Relay 13 b Date 2014 04 08...
Страница 296: ...14 Decommissioning and Disposal PCS 9611 Feeder Relay 14 b Date 2014 04 08...
Страница 298: ...14 Decommissioning and Disposal PCS 9611 Feeder Relay 14 2 Date 2014 04 08...
Страница 300: ...15 Manual Version History PCS 9611 Feeder Relay 15 2 Date 2014 04 08...