3
Operation
Theory
PCS-978 Transformer Relay
3-144
Date: 2013-01-16
3.15.4 Logic
Timer
t
t
Inverse for OV2 only
EN
[x.59Pn.En]
SIG
[x.59Pn.En1]
SIG
[x.59Pn.En2]
SIG
[x.59Pn.Blk]
&
SIG
[x.59Pn.U3P]
SET
[x.59Pn.U_Set]
&
[x.59Pn.St]
[x.59Pn.Op]
Figure 3.15-1 Logic diagram of residual overvoltage protection (59Pn, n=1,2)
For any stage phase overvoltage protection, if following three conditions are met, the stage
protection will be enabled.
(1) Logic setting [x.
59Pn.En] is set to “1”.
(2) Enabling inputs [x.59Pn.En1], [x.
59Pn.En2] are both set to “1”
(3) Blocking input [x.
59Pn.Blk] is set to “0”.
When the protective function block is disabled, [x.59Pn.St], [x.59Pn.Op] signals are both reset.
Default values of Inputs [x.59Pn.En1], [x.
59Pn.En2] are “1” and [x.59Pn.Blk] is “0” when those
inputs are not connected to external signals or settings.
3.15.5 Inputs and Outputs
59P
U3P
En1
En2
Blk
St
Op
Figure 3.15-2 Function block 59G (Each stage)
Table 3.15-2 Input signals of function block 59G (Each stage)
No.
Signal
Description
1
U3P
Three phase voltage data, including calculated residual voltage.
2
En1
Function enabling input1 and input 2, it can be binary inputs or settings, such as function
enabling binary inputs, logic links, etc.
3
En2
4
Blk
Function blocking input, such as function blocking binary input.
If the input is 1, the protection is not reset and time delay will be cleared.
Summary of Contents for PCS-978
Page 1: ...PCS 978 Transformer Relay Instruction Manual NR Electric Co Ltd ...
Page 2: ......
Page 6: ...Preface PCS 978 Transformer Relay IV Date 2013 01 16 ...
Page 10: ...Preface PCS 978 Transformer Relay VIII Date 2013 01 16 ...
Page 62: ...3 Operation Theory PCS 978 Transformer Relay 3 p Date 2013 01 16 ...
Page 250: ...4 Supervision PCS 978 Transformer Relay 4 b Date 2013 01 16 ...
Page 264: ...4 Supervision PCS 978 Transformer Relay 4 14 Date 2013 01 16 ...
Page 266: ...5 Management PCS 978 Transformer Relay 5 b Date 2013 01 16 ...
Page 272: ...5 Management PCS 978 Transformer Relay 5 6 Date 2013 01 16 ...
Page 334: ...6 Hardware Description PCS 978 Transformer Relay 6 60 Date 2013 01 16 ...
Page 370: ...8 Human Machine Interface PCS 978 Transformer Relay 8 d Date 2013 01 16 ...
Page 404: ...8 Human Machine Interface PCS 978 Transformer Relay 8 34 Date 2013 01 16 ...
Page 406: ...9 Configurable Function PCS 978 Transformer Relay 9 b Date 2013 01 16 ...
Page 446: ...10 Communication PCS 978 Transformer Relay 10 26 Date 2013 01 16 ...
Page 448: ...11 Installation PCS 978 Transformer Relay 11 b Date 2012 10 09 ...
Page 456: ...11 Installation PCS 978 Transformer Relay 11 8 Date 2012 10 09 ...
Page 458: ...12 Commissioning PCS 978 Transformer Relay 12 b Date 2012 12 07 ...
Page 468: ...12 Commissioning PCS 978 Transformer Relay 12 10 Date 2012 12 07 ...
Page 470: ...13 Maintenance PCS 978 Transformer Relay 13 b Date 2012 10 09 ...
Page 474: ...13 Maintenance PCS 978 Transformer Relay 13 4 Date 2012 10 09 ...
Page 476: ...14 Decommissioning and Disposal PCS 978 Transformer Relay 14 b Date 2012 10 09 ...
Page 478: ...14 Decommissioning and Disposal PCS 978 Transformer Relay 14 2 Date 2012 10 09 ...
Page 480: ...15 Manual Version History PCS 978 Transformer Relay 15 2 Date 2013 01 16 ...