3
Operation
Theory
PCS-978 Transformer Relay
3-52
Date: 2013-01-16
No.
Signal
Description
5
87R.Alm_Diff
CT secondary circuit for current differential protection is abnormal.
6
87T.Alm_CTS
CT secondary circuit for differential protection fails.
Alarm reports of equipment operation.
7
87R.TrigDFR_Instant
Instantaneous differential protection picks up to trigger DFR function.
8
87R.TrigDFR_Biased
Biased differential protection picks up to trigger DFR function.
9
87R.TrigDFR_DPFC
DPFC differential protection picks up to trigger DFR function.
Signals of protection element triggering DFR function recorded as IO events.
NOTE!
DFR is disturbance and fault recording, also called oscillograph function.
Table 3.3-4 Output signals of 87T: measurements
No.
Signal
Description
Unit
1
Ia_Corr_L
Corrected values of three phase currents of CT at line side used for
differential protection.
pu
Ib_Corr_L
pu
Ic_Corr_L
pu
I0_Corr_L
Corrected values of calculated residual current at line side
2
Ia_Corr_N
Corrected values of three phase currents of CT at neutral side used
for differential protection.
pu
3
Ib_Corr_N
pu
4
Ic_Corr_N
pu
5
I0_Corr_N
Corrected values of calculated residual current at neutral side
6
I2b_ Diff_L
Rated secondary current of CT at line side used for differential
protection.
A
7
I2b_ Diff_N
Rated secondary current of CT at neutral side used for differential
protection.
8
Ang(Ia)_L-N
Phase angles of corrected currents between CT at line side and CT
at neutral side.
deg
9
Ang(Ib)_ L-N
10
Ang(Ic)_ L-N
11
Ang(I0)_ L-N
12
Ida, Idb, Idc,Id0
Three-phase differential current value, zero-sequence differential
current current.
pu
13
Ithra, Ithrb, Ithrc,
Ithr0
Threshold value of restraint current.
pu
14
Ida_Hm2_Pct
Idb_Hm2_Pct
Idc_Hm2_Pct
Second harmonic percentage of total differential current.
%
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 ...