3
Operation
Theory
PCS-978 Transformer Relay
3-64
Date: 2013-01-16
No.
Signal
Description
1 x.64REF.Op
Restricted earth fault protection of x side operates.
Tripping reports of protection element.
2 x.64REF.St
Restricted earth fault protection of x side starts.
Start signals of protection element.
3 x.64REF.Alm_Diff
CT secondary circuit for restricted earth fault protection of x side is abnormal.
4 x.64REF.Alm_CTS
CT secondary circuit for restricted earth fault protection of x side fails.
Alarm reports of equipment operation.
5 x.64REF.TrigDFR
DPFC differential protection of x side picks up to trigger DFR function..
Signals of protection element triggering DFR function recorded as IO events.
Table 3.4-4 Output signals of 64REF: measurements
No.
Signal
Description
Unit
1 x.64REF.I0d
Residual differential current of x side REF protection.
In
2 x.64REF.I0thr
Residual threshold current of x side REF protection.
In
3 x.64REF.I0_Corr_Br
m
Corrected value of calculated residual current of x side branch
m
(m=1, 2, 3, 4,).
In
4 x.64REF.I0_Corr_Neu
Corrected value of current from neutral CT of x side.
In
5 x.64REF.Ang(3I0)_Br1-Br
m
Angle of calculated residual current between x side branch 1 and
branch m(m=2, 3, 4,).
deg
6 x.64REF.Ang(3I0)_Br1-Neu
Angle between calculated residual current of HV side branch 1 and
current from neutral CT of x side.
deg
7 x.64REF.K_Br
m
Corrected coefficient of current of HV side branch
m
(m=1, 2, 3, 4)
for REF protection of x side.
8 x. 64REF.K_Neu
Corrected coefficient of current from neutral CT for REF protection of
x side.
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REF Measurements
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REF Measurements
3.4.6 Settings
Table 3.4-5 Setting list of 64REF of each side
No.
Setting Item
Range
Step
Unit
Description
1 x.64REF.I_Knee
0.1~4
0.001
In
Knee point setting of biased REF protection.
2 x.64REF.I_Biased
0.05~5
0.001
In
Pickup setting of biased REF protection
3 x.64REF.Slope
0.2~0.75
0.001
Percentage restraint coefficient of biased REF
protection
4 x.64REF.t_Op
0~20s
0.001
s
Time delay for REF protection. Recommended value
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 ...