3
Operation
Theory
PCS-978 Transformer Relay
3-94
Date: 2013-01-16
3.8.6 Inputs and Outputs
81U
U3P
Freq
En1
En2
Blk
St
UF1.Op
UF2.Op
UF3.Op
UF4.Op
Figure 3.8-3 81U function block
81O
U3P
Freq
En1
En2
Blk
St
OF1.Op
OF2.Op
OF3.Op
OF4.Op
Figure 3.8-4 81O function block
Table 3.8-1 Input signals of 81U and 81O function block
No.
Signal
Description
1
U3P
Three-phase voltage data input.
2
Freq
Measured frequency data input.
3
En1
Function enabling input1 and input 2, it can be binary inputs or settings, such as function
enabling binary inputs, logic links, etc.
4
En2
5
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.
Table 3.8-2 Output signals of 81U function block
No.
Signal
Description
1
St
Overfrequency protection starts.
2
UF1.Op
Overfrequency protection stage 1 operates.
3
UF2.Op
Overfrequency protection stage 2 operates.
4
UF3.Op
Overfrequency protection stage 3 operates.
5
UF4.Op
Overfrequency protection stage 4 operates.
Table 3.8-3 Output signals of 81O function block
No.
Signal
Description
1
St
Overfrequency protection starts.
2
OF1.Op
Overfrequency protection stage 1 operates.
3
OF2.Op
Overfrequency protection stage 2 operates.
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 ...