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3 Operation Theory
PCS-9611 Feeder Relay
3-23
Date: 2014-04-08
[VTS.En]
[50/51G.En_VTS_Blk]
[VTS.Alm]
I
01
(present measure)
U
0
(present measure)
[50/51G1.Opt_Dir] ≠ 0
Zero Sequence
Direction Check
&
50/51G1.Dir
[
BI_En_VT
]
Figure 3.5-4 Logic diagram of the directional element for the No.1 ROC1 protection
Where:
[50/51G1.Opt_Dir] is the setting which is used to select the directional mode (non -directional,
forward, reverse) of the directional element for the stage 1 ROC protection;
[VTS.En] is the logic setting of the protection voltage transformer supervision function;
[50/51G.En_VTS_Blk] is the logic setting of the function which blocks all the 1ROC protective
elements that relate to the voltage measurement when the voltage transformer is failed;
[BI_En_VT] is the binary input for denoting the local VT is in service;
[VTS.Alm] is the alarm signal of the protection voltage transformer supervision.
3.5.4 Harmonic Blocking Element for ROC Protection
To prevent maloperation of the zero sequence overcurrent protection when the transformer is
energized without any load, this relay provides a 2
nd
harmonic blocking function for resolving such
a problem.
The percent threshold of the 2
nd
harmonic blocking element to the fundamental wave can be set
through the setting [50/51G.K_Hm2].
When the fundamental current is greater than the setting [50/51G.3I0_Rls_HmBlk], the harmonic
blocking element for the zero sequence protection is released.
The following figure shows the logic diagram of the harmonic blocking element for the stage 1
zero sequence overcurrent protection.
&
50/51G1.HmBlk
[50/51G1.En_Hm_Blk]
|I
012
/I
01
| > [50/51G.K_Hm2]
I
01
> [50/51G.3I0_Rls_HmBlk]
Figure 3.5-5 Logic diagram of the No.1 ROC1 harmonic blocking element
Where:
[50/51G1.En_Hm_Blk] is the logic setting of the harmonic blocking element;
[50/51G.K_Hm2] is the percent setting of the harmonic blocking element;
[50/51G.3I0_Rls_HmBlk] is the current setting for releasing the harmonic blocking element;
“I
01
” is the No.1 zero sequence current;
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...