SOUTHERN REGIONAL POWER COMMITTEE · PDF fileheld on 21st November 2013 in the Conference Hall...
Transcript of SOUTHERN REGIONAL POWER COMMITTEE · PDF fileheld on 21st November 2013 in the Conference Hall...
SOUTHERN REGIONAL POWER COMMITTEE BANGALORE
Minutes of the 26th
Meeting of Protection Coordination Sub-Committee
of SRPC held on 20 & 21.11.2013
1. Introduction
1.1 The 26th Meeting of Protection Coordination Sub-Committee (PCSC) was
held on 21st November 2013 in the Conference Hall of Southern Regional
Power Committee, Bangalore. It was preceded by the Sub Group meeting
of PCSC on 20th November 2013. The list of participants for the Sub Group
and the PCSC meeting is enclosed as Annexure - I & II respectively.
1.2 Shri S. R. Bhat, Member Secretary i/c, SRPC welcomed Shri R.S
Alagappan, Chief Engineer (P&C), TANTRANSCO and other Members and
Participants to the 26th Meeting of the Protection Coordination Sub-
Committee. He said that NEW Grid and Southern Region Grid were
scheduled to be synchronized in the near future with the commissioning of
765 KV Raichur - Sholapur line to form “NEWS” Grid. He also stated that
SPS as proposed by NLDC/POSOCO, were to be in place before the NEW
Grid synchronization with the Southern Region. The time schedule for
implementation was to be discussed in the meeting.
1.3 MS i/c, SRPC briefed the forum that issues relating to Power Swing
Blocking settings of Distance Relays, Philosophy of Zone 3 settings and
also time delays in df/dt relays were discussed in the Sub Group meeting.
He added that the frequency controller test as on HVDC Bhadrawathi link
was scheduled to be held on 22nd November 2013.
1.4 MS i/c, SRPC requested the constituents to submit the Report/data relating
to Grid Occurrences/disturbances as specified in the Regulations to SRLDC
and SRPC within the prescribed time. This was highly essential to analyze
the occurrences and come out with remedial measures/action.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 2
2. Confirmation of the Minutes of the 25th Protection Coordination Sub-Committee meeting held on 22nd October 2013
The Minutes of the 25thPCSC meeting were confirmed, since no comments
were received from the constituents.
3. Recommendations of the Sub Group meeting of PCSC held on 20.11.2013.
3.1 Recommendations w.r.t. Zone 3 settings in SR KPTCL and APTRANSCO would review the impedance settings of the
lines as mentioned in SRTS-II, PGCIL letter (Annexure III). Load encroachment feature would be enabled on all 400 kV lines and also
on 220/230 KV lines where Numerical relays are installed. Load angle shall be kept below 30 degree and if possible it should be set
at 26 degree. Resistive reach of the relay should be more than sum of line resistance,
Arc resistance and Tower foot resistance. Resistive reach of the relay should be less than minimum load resistance
of the system ideally if possible should be kept at 60% of minimum Load resistance. This percentage is only an indicative figure, places where high resistance fault have occurred should analysis previous fault data for setting resistive reach.
Out of Step Settings to be enabled in Critical lines after due analysis of PMU data.
Timing for Zone-3 action is as follows: o 400 kV lines – 1 sec. o Interstate lines – 1 sec o For Zone 4/5/Rev Zone : Zone 3 time + 100 msec
Timing for Zone-2 is as follows:
o 350 ms o if long line is followed by a short line: 500 ms but with the approval
of PCSC forum of SRPC o The forum agreed for the staggered settings i.e. 350ms, 400ms,
450ms and 500 ms as requested by PGCIL.
3.2 Power swing block Settings in SR Existing Settings of Power Swing Block to be continued. The Sub Group recommended for KGS-Kaiga lines to also block Power
Swing for 2 seconds in line with the Regional Settings.
3.3 df/dt settings in SR
The time delay of up to 0.6 sec maximum for both detection and tripping of df/dt relay was agreed.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 3
MS i/c, SRPC informed that the initiation df/dt settings would be reviewed as per the system requirements.
3.4 O/V settings:
The existing practice of time and voltage graded tripping would be continued.
The constituents were advised to enable the over voltage settings and DEF settings as recommended by the OCC/PCSC forums of SRPC at the earliest. Confirmation in this regard may be sent to the PCSC forum for record purpose.
4. Grid Disturbances in Southern Region
4.1 Multiple tripping & generation loss at Idukki power station on
03.11.2013 at 18:17 Hrs
(i) Date and Time of event 03.11.2013 at 18:17 Hrs
(ii) Location Idukki, Kerala
(iii) Plant and/or Equipment
directly involved Idukki Power Station, KSEB
(iv) Reported Disturbance / Fault
CB blast of unit 5 of Idukki resulted in tripping of 4
Nos Idukki units along with 220kV lines from Idukki
power station
(v) Generation Loss 400 MW
(vi) Duration of interruption 40 Minutes to 3 Hours
(vii) Category GD 1
The Grid Disturbance analysis as submitted by SRLDC is enclosed as
Annexure-IV.
The Grid Disturbance Report as submitted by KSEB is enclosed as
Annexure-V.
Deliberations
It was brought to the notice of the forum that all running units and connected 220kV lines at Idukki had tripped.
KSEB informed the following: o The triggering incident was failure of circuit breaker of Unit #5 at Idukki
hydro station. o Y phase limb of the Circuit Breaker had exploded. They informed the
substation was old (commissioned in the year 1986). o They have replaced the old relay (high impedance) with the Numerical
Relay (of Low impedance type). o The bus-bar scheme does not have provision (i.e. bus coupler is
without CT) for isolating one bus section during fault in the adjacent bus bar.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 4
Recommendation
As the Plant was more than 25 years old, all yard equipment need to be replaced.
Modification of Bus Scheme to be carried out.
4.2 Multiple tripping & generation loss at Idukki power station on 07.11.2013 at 17:22 Hrs
(i) Date and Time of event 07.11.2013 at 17:22 Hrs
(ii) Location Idukki, Kerala
(iii) Plant and/or Equipment directly
involved Idukki Power Station, KSEB
(iv) Reported Disturbance / Fault
All running units /available lines at 220kV Idukki
Station (KSEB) tripped due to Bus PT flashover
which resulted in external fire.
(v) Generation Loss 590 MW
(vi) Duration of interruption 1 Hour 35 Minutes to 22 Hours 30 Minutes.
(vii) Category GD 1
The Grid Disturbance analysis as submitted by SRLDC is enclosed as
Annexure-VI.
The Grid Disturbance Report as submitted by KSEB is enclosed as
Annexure-VII.
Deliberations
KSEB informed that all the running units and the connected 220 KV lines at Idukki Hydro Generating stations had tripped.
The triggering incident was failure of Bus Potential Transformer and it lead to the multiple tripping and generation loss to the tune of 590 MW.
Recommendation
The PCSC forum recommended for the modification of Bus Bar protection scheme at Idukki Substation. In the event of bus fault the entire substation should not be affected. This would improve the reliability and security of the Idukki Hydro Generating station.
5. Grid Incidences in the Southern Region
SN
Details of Event Date & Time
Reason 26th
PCSC Deliberation Cate- gory
1 400kV Hassan-
UPCL line
5.11.2013
at 10:48
Hrs
Transient fault in
B-Phase. Line
did not auto
reclose
(i) It was informed that the
Auto Reclosure was blocked
at Hassan Substation.
(ii) It was informed that the
DR was not time
synchronized.
(iii) PCSC forum
recommended UPCL to
check their distance
GI-2
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 5
protection system.
PGCIL and UPCL to
implement POR/POTT
scheme for distance
protection on UPCL-Hassan
Lines.
2
Tripping of 220kV
Gooty-Alipura line
3.11.2013
at 12:44
Hrs
Delayed
clearance
observed from
PMU data
(i)APTRANSCO Single bus
system with multiple lines in
the Substation.
(ii)The PCSC forum
recommended for provision
of Bus Bar Protection
system in the 220 KV
Alipura Substations.
GI-I
3
Tripping of 220kV
Idukki-Udumalpet
line
2.11.2013
at 13:15
Hrs
Delayed
clearance
observed from
PMU data
(i)KSEB informed that at
Idukki zone-2 tripping was
there.
(ii)It also said carrier
received from Udumalpet
and PLC counter operated
but relay not operated.
(iii)They were planning for
End to end testing.
(iv) At Udumalpet D/R would
be enabled.
(v)KSEB informed that at
Moolamattom single phase
A/R was not there as the
relay is without that feature.
The relay would be replaced
with the numerical Relay.
GI-1
4
Tripping of 400
KV Ramagundam
Hyderabad Lines 4.
25.10.2013
at 23:30 hrs
Tripped at
Hyderabad end
OV-tripped at
RDM on receipt
of DT.
The ICT was not tripped As
reported in the Agenda. GI-2
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 6
5
Tripping of 220kV
Kaiga-Kodasalli
line, 220kV
Kodasalli-Nagjheri
line & 220kV
Kodasalli-Kadra
line
25.10.2013
at 13:21
Hrs
Back up
protection had
operated.
Fault observed in
Y-B phase which
was cleared in
440 ms
(i) KPTCL informed that no
data was received from
KPCL
(ii) KPCL informed that no
DR/EL for the Substation.
(iii)KPTCL informed that No
Generation at Nagjhari and
Kadra at the time of fault.
(iv)The PCSC forum
requested for timely
submission of tripping /
Analysis Report.
Expert Team to be sent to
analysis the tripping as no
information about the
tripping was available with
the forum.
GI-I
6
Tripping of
400/220kV
Vijayawada ICT-
1&2
25.10.2013
at 10:32
Hrs
Both ICT 220kV
side breakers had
tripped due to
operation of bus-
bar protection in
220 kV
switchyard of
APTRANSCO.
(i)APTRANSCO informed
that on the day of tripping,
there was heavy raining.
(ii) It was informed that the
Substation had 2 bus
schemes, and both bus-1 and
bus2 got tripped during the
incident.
(iii) APTANSCO informed
that there was relay
scheme/topology problem
and the same will be rectified
in one month time.
GI-2
7 Tripping of 400 kV Gooty-NPS line-2
19.10.2013
at 16:03
Hrs
Direct trip
received at both
ends
(i) It was informed to the
forum that the tripping was
due to Relay problem.
(ii) Direct Transfer (D/T) trip
was there for both Main and
Tie CBs; It was informed
that the SF6 CB wiring was
modified
GI-2
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 7
(iii)It was also informed that
the NO and NC contacts
were sticky and the same
was rectified.
8
Tripping of 400kV
Madurai-
Thirunelveli line
16.10.2013
at 21:04
Hrs
Transient fault in
B-Phase. Line
failed to reclose
at Madurai end
It was informed that the
tripping was due to
maloperation of Relay and
the relay was replaced.
GI-2
9 400/220 kV ICT-2
at Gooty
06.10.2013
at 12:56
Hrs
As reported ICT
tripped on over
flux protection
(i) It was informed that the
Voltage went up to 270kV
and over flux relay operated.
(ii)PGCIL informed that
normally D/R is not wired to
ICTs and it is only for lines.
(iii)As there were no loads in
the downstream due to local
agitation, the system voltage
went up.
GI-2
10
Tripping of
400/220kV kV
ICT-2 at Chittoor
substation
06.10.2013
at 12:25
Hrs
As reported ICT
tripped on over
flux protection
As there were no loads in the
downstream due to local
agitation, the system voltage
went up.
GI-2
11
Tripping of 220kV
Ambewadi-Ponda
line-2
3.10.13 at
12:44 hrs Delayed fault
clearance
observed through
PMU data during
both in incidents
(i)KPTCL informed that the
Distance Protection
numerical Relay was faulty.
(ii) The Relay was replaced
with the new relay .DR to be
enabled
GI-1
12
Tripping of 220kV
Ambewadi-Ponda
line-2
22.10.2013
at 12:35
Hrs
6. New SPS Schemes proposed by NLDC
NLDC vide (i) Letter No NLDC /SR-Sync-SPS dated 18.11.2013 and (ii) Letter No NLDC /SR-Sync-SPS/Addendum dated 21.11.2013 proposed the following SPS schemes for the SR.
(i) Modification of Talcher Kolar SPS. (ii) Modification in Kudankulam SPS (iii) New SPS for 765 KV Sholapur Raichur section.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 8
(iv) SPS for tripping one of 400 KV Hiriyur Nelamangala DC Line and flow on other line > 850 MW.
(v) SPS for tripping of one of the 400 KV Gooty Nelamangala SC Line or 400 KV Gooty - Somanahalli SC Line and flow on other line > 850 MW.
Deliberations
Modification in the Talcher Kolar SPS ,Modification in the Kudankulam SPS Scheme and the New SPS scheme for the 765 KV Sholapur Raichur line was discussed in the Sub Group meeting of PCSC and the PCSC meetings.
It was informed to the forum that the above SPS schemes were circulated to the constituents during the Sub Group meeting day and on the PCSC meeting day.
The SPS for Hiriyur Nelamangala and SPS for 400 KV Gooty Somanahalli were communicated to the constituents.
SRLDC informed that the SPS schemes as proposed by NLDC were vital for secure operation of the after synchronization of Southern Grid with New Grid over 765 KV Sholapur Raichur line.
SRLDC insisted for identification of 800 MW load (for Kudankulam SPS) and taking up the same immediately.
Recommendations
PCSC forum recommended for the expeditious commissioning of SPS schemes in the Southern Region for Secure operation of Grid after synchronization of SR with NEW Grid.
In the PCSC meeting it was agreed that the 800 MW additional loads (in the average ratio of Trip Signal I, Trip Signal II and Trip Signal III) by the SR constituents latest by 2nd December 2013.
The following time schedule was agreed upon:
o Identification of loads by constituents latest by 2nd December 2013.
o Trip Signal would be ready by 10th December 2013 o Integration with CTU signal would be ready by 15th December 2013
and o Mock testing of the Trip Signal would be carried out on 20th
December 2013 .
SRPC vide Lr No SRPC/2013/12363-77 dt 22.11.2013 informed the quantum of loads to be identified by the constituents (for 800 MW ) and the SPS Schemes proposed by NLDC and course of action to be taken by the respective constituents (Annexure VIII).
The PCSC forum requested the constituents to be in touch with SRLDC/CTU regarding the implementation of the SPS if any clarification needed in the implementing the same since the SPS schemes to be completed within the agreed time.
List of Task assigned to various agencies is enclosed in Annexure VIII-A.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 9
7. Status of Pending Protection issues
The following pending protection issues were discussed in the 26th PCSC meeting.
7.1 Recommendation to be complied by November 2013
S
N
Recommendation The meeting
in which the
issue was
Discussed
Anticip
ated
date of
complet
ion
Agency Status 26th
PCSC
Deliberations
1 Relay/CVT error in 400
KV Kaiga-2 Line
24th PCSC
26.09.2013 )
Oct-13 KPTCL Attended KPTCL informed that
old CVT is replaced with
the new CVT on
08.11.2013.
2 The non availability of
220 KV and 400 KV bus
coupler is affecting the
reliability of 400/220
KV Guttur Substation
24th PCSC
(26.09.2013 )
Nov-13 KPTCL To be
Completed
Replacement of 400 kV
B/C and other CBs are
taken up.
3 DTOC settings for ICTs
to be removed and
IDMT settings to be
adopted.
21st
PCSC
(25.06.2013)
Nov-13 SRTS I,
PGCIL
Would be
completed
by the
month end
SRTS I, PGCIL
informed the corporate
approval was received
and complied with the
end of Nov 2013.
4 DG set not available-
Edamon
17th PCSC
(26.02.2013 )
Nov-13 KSEB Pending Tenders were floated
but no supplier has
quoted.
Re tendering was
started.
Would be completed by
Mar-2014
5 Carrier inter-tripping is
not available for SBEM
1,2,3 feeders-Edamon
17th PCSC
(26.02.2013 )
Nov-13 KSEB Completed Implemented.
6 Main2 distance
protection for EMPC#1
feeder not available-
Edamon
17th PCSC
(26.02.2013 )
Nov-13 KSEB Would be
completed.
Would be completed by
the month end.
7 LBB not in service for
SBEM 2, 3 and EMPC
#1- Edamon
17th PCSC
(26.02.2013 )
Nov-13 KSEB Would be
completed.
Would be completed by
the month end.
8 IDMT characteristics for
earth fault relay of the
GTs in UPCL
24th PCSC
26.09.2013 )
Nov-13 UPCL Would be
completed.
Would be completed by
the month end.
9 At Mamidipally
synchronizing time hour
pulse with Ghanapur s/s
23rd PCSC
held on
27.08.2013
Nov-13 APTRA
NSCO
completed Aptransco informed that
the GPS was working.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 10
7.2 Recommendation to be complied by December 2013
SN Recommendation The meeting in
which the issue
was Discussed
Anticipated
date of
completion
Agency Status 26th
PCSC
Deliberations
1 The Main I and
Main II Protection
of Different make-
Sharavathy
21st PCSC
held on
25.06.2013
Dec-13 KPCL Pending KPCL informed
that the protection
issue would be
sorted within the
agreed time.
2 Replacement of
OLD CBs at
Sharavathy
21st PCSC
held on
25.06.2013
Dec-13 KPCL Pending KPCL informed
that the protection
issue would be
sorted within the
agreed time.
3 COMPLIANACE
OF 3RD PARTY
AUDIT REPORT-
Sharavathy
17th PCSC -
25th PCSC
(26.02.2013 to
22.10.2013)
Dec-13 KPCL Pending KPCL informed
that the protection
issue would be
sorted within the
agreed time.
4 BUSBAR
PROTECTION AT
KAYATAR
110KV
SUBSTATION
21st PCSC
held on
25.06.2013
Dec-13 TANTR
ANSCO
Pending TANTRANSCO
informed that the
protection issue
would be sorted
within the agreed
time.
6 PROVIDING DR
AND EL-
MAMIDAPALY
23rd PCSC held
on 27.08.2013
Dec-13 APTRA
NSCO
Pending APTRANSCO
informed that the
protection issue
would be sorted
within the agreed
time.
7 48 V DC SUPPLY
REDUNDANCY
NOT
AVAILABLE-
EDAMON
17th PCSC
(26.02.2013 )
Dec-13 KSEB Pending KSEB informed
that the protection
issue would be
sorted within the
agreed time.
8 Modification of the
present breaker
tripping scheme of
Haveri line-2 so
that the trip coils
are activated
through two
different DC
sources
24th PCSC
(26.09.2013 )
Dec-13 KPTCL Pending KPTCL informed
that the protection
issue would be
sorted within the
agreed time.
9 NPCIL and
KPTCL in
coordination to
review the
protection settings
at Kaiga
24th PCSC
(26.09.2013 )
Dec-13 KPTCL Pending Would be
completed by
December end.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 11
7.3 Recommendation to be complied by Mar 2014
SN Recommendation The meeting in
which the issue
was Discussed
Anticipated
date of
completion
Agency Status 26th
PCSC
Deliberations
1 EARTH PITS at
EDAMON
17th PCSC
(26.02.2013 )
Mar-14 KSEB Pending KSEB informed
that the protection
issue would be
sorted within the
agreed time.
2 ONLY ONE BUS
IS AVAILABLE,
TRANSFER BUS
SHALL BE
PROVIDED-
EDAMON
17th PCSC
(26.02.2013 )
Mar-14 KSEB Pending KSEB informed
that the protection
issue would be
sorted within the
agreed time.
7.4 Recommendation to be complied by Aug 2014
SN Recommendation The meeting in
which the issue
was Discussed
Anticipated
date of
completion
Agency Status 26th
PCSC
Deliberations
1 Synchronizing
Facility at Hubli.
17th PCSC
(26.02.2013 )
Aug-14 KPTCL Pending KPTCL informed
that the protection
issue would be
sorted within the
agreed time.
Deliberations
The PCSC forum requested the constituents to implement the above protection
committee recommendations on priority basis.
8. SPS for Kudankulam Nuclear Power Station
SRLDC brought to the notice of the PCSC forum that there had been re-
orientation recently in respect of 400 KV lines emanating from Kudankulam.
Three 400kV lines were now from Kudankulam to Thirunelveli while remaining
one line is from Kudankulam to Madurai. Hence the following logic was
proposed for SPS at Kudankulam on account of the change in the
configuration:
Contingency Action
Tripping of all three lines from
Kudankulam to Thirunelveli and two
units in running condition at Kudankulam.
One unit at Kudankulam to go on house load
and the second unit generation would be
evacuated through 400kV Kudankulam-
Madurai line.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 12
26th PCSC Deliberations
NPCIL informed the forum that they have raised certain queries with the
CTU and waiting for their reply.
SRLDC informed the forum that the proposed SPS for Kudankulam
Generators was mainly as a preventive action in the interest of not losing
the NPCIL units.
PCSC forum requested NPCIL to implement the proposed SPS in
consultation with the CTU/SRLDC.
9. Review of Power swing block settings of Distance protection relay
Deliberations
The issue was discussed in detail in the Sub Group meeting of PCSC and the recommendations were laid in item 3.2
10. Phasing of Implementation of Protection Audit Recommendations
In the 23rd SRPC meeting held on 26th October 2013 it was agreed that the utilities to carry out implementation of the recommendations relating to
third party protection audit as per prioritization in a phased manner.
The schedule of activities would be furnished with in one month and would be discussed in the Protection sub committee meeting.
The utilities would commence works identified in the above schedule without waiting for funding.
Deliberations
CE (P&C), TANTRANSCO informed the PCSC forum that they had already started phasing of Protection Audit Recommendations in phases and the compliance regarding this would be sent at the earliest.
KSEB informed the forum that they were also in the process of phasing the Protection Audit recommendations and would be intimating the same.
KPTCL agreed to inform the same with in a month's time.
APTRANSCO informed the forum that they have already submitted the DPR. Phasing of works was yet to be carried out.
Member Secretary i/c, informed the forum that as per the decision in 23rd SRPC Meeting, the items included in the DPR (i.e. implementation of Protection Audit Recommendations) were to be prioritized in phases. He requested the cooperation of the utilities in early implementation of SRPC decision.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 13
Puducherry was also requested to submit the phasing of implementation of Protection Audit recommendations.
Recommendations
PCSC form recommended for submitting the Phasing of implementation of the Protection Audit recommendation to SRPC secretariat latest by 19.12.2013.
11. Tripping Incidents in the Southern Region
The tripping details that had occurred in the Southern Region during the
month of October-November, 2013 is attached herewith as Annexure-IX.
Constituents were requested to update the details in the SRLDC Website at
the earliest to analyze the incidents and suggest remedial measures if any.
12. Status of implementation: SPS in Southern Region
S
N
Name of the
Scheme Details of the scheme
Impleme
nting
Agency
26th
PCSC
Deliberations
PCSC
Recommendations
1 Proposed
Modification in
the SPS at
Kolar SS
In the 16th
PCSC the forum
proposed an additional trip logic
(dp/dt )to the Kolar SPS during
contingencies similar to New
Grid disturbance on 31.07.2012
PGCIL PGCIL
informed that
the SPS is
under Process.
Would be
completed by
end November
2013.
The forum requested
PGCIL to complete
the modification
within the agreed
time.
2 Kudankulam
SPS
The Modification in the SPS as
proposed by NLDC discussed
vide item No 6.
PGCIL
/SR
Constitue
nts
800 MW
Loads has to
be identified
by the
constituents.
AP- 177 MW
Kar- 193 MW
Kerala- 132 MW
TN - 298 MW.
(In the Avg. Ratio of
TSI,TS IIand TS III)
3 Modification in
NTPC Talcher
SPS
NLDC has proposed for
medication in the SPS for secure
operation of Grid after
synchronization of SR with
NEW Grid .
NTPC/C
TU in
consultat
ion with
NLDC
and
SRLDC
Discussed
vide item No
6.
NTPC/CTU to
implement the SPS in
consultation with
NLDC and concerned
RLDCs as scheduled
in item No 6.
13. Status of implementation: SPS in Andhra Pradesh
S
N
Name of the
Scheme Details of the scheme
Impleme
nting
Agency
26th
PCSC
Deliberations
PCSC
Recommendations
1 Vijayawada-
Nellore SPS
if one of 400kV Vijayawada-
Nellore D/C line trips and before
tripping flow each circuit is
>550 MW then back down
generation or trip one generating
PGCIL ./
APTRA
NSCO/IP
Ps
PGCIL
informed that
the SPS was
ready.
APTRANSCO
The PCSC forum
decided to conduct
mock exercise on
30th November 2013.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 14
unit each at GMR Vemagiri,
Gouthami, Konaseema,
Jegurupadu-II and Lanco.
Total generation back down of
430 MW. Proposed in 9th PCSC
(9.07.2010)
was requested
to coordinate
the Mock
exercise with
IPPs.
14. Status of implementation: SPS in Karnataka
S
N
Name of the
Scheme Details of the scheme
Impleme
nting
Agency
26th
PCSC
Deliberations
PCSC
Recommendations
1 Somanahally&
Bangalore
water supply
a) To trip all 220kV lines & 220
/ 66kV trfs except 220 kV
Harohalli & Tataguni lines at
Somanahally and to trip
Vrishabhavathi line at Tataguni
when ICTs at Somanahally trip.
b) To trip 220 kV Vajamangala
and Madhuvanahally-1 & 2 lines
at TK Hally when ICTs at
Mysore trip.
KPTCL
KPTCL
informed that
the Substation
feeding
configuration.
KPTCL is
modifying the
logic as per the
latest
configuration.
The PCSC forum
requested KPTCL to
submit the SPS Logic
to the SRPC
Secretariat.
15. Status of implementation: SPS in TamilNadu
S
N
Name of the
Scheme Details of the scheme
Impleme
nting
Agency
26th
PCSC
Deliberations
PCSC
Recommendation
s
1 Madurai SPS To avoid overloading of
Madurai ICTs.
TANTR
ANSCO
TANTRANSC
O informed that
the scheme
would be ready
by end of
November 2013.
The forum
requested
TANTRANSCO to
implement the
scheme within the
agreed time.
16. Implementation of Islanding schemes in SR
Deliberations
The PCSC forum requested TANTRANSCO to implement the remaining part
of Stage II of the Islanding Scheme at the earliest. Since the other utilities
had completed their part. TANTRANSCO agreed to complete their part by
the agreed time line of end November 2013..
17. The issue of AUFR stages and implementation in SR
In the second NPC Meeting, it had been agreed that there would be four
stages for AUFLS starting with 49.2 Hz. The various stages for AUFLS
operation are 49.2 Hz, 49 Hz, 48.8 Hz and 48.6 Hz.
Minutes of the 26th Protection Coordination Sub Committee Meeting held on 20 and 21.11.2013 Page 15
Deliberations
It was noted that all the stages had been implemented except portion of
the last stage of 48.6 Hz in TN. TN was agreed to complete its portion by
the end of November 2013.
18. Submission of completed dynamic study data
Deliberations
All SLDCs were requested to direct the embedded IPPs connected at
220 KV and above voltage level to submit completed dynamic study
format to SRPC, Secretariat.
NPCIL, MAPS was requested to submit the dynamic study data of their
system.
19. Requirement of Under Voltage Relays (UVR) for SR
The PCSC forum had proposed for the provision of under voltage relays in various low voltage pockets to ensure reliable power supply and grid safety. (Annexure-X).
20. Implementation of recommendations of Grid Disturbance enquiry committee
The updated list of constituents sending the Healthiness of batteries is
enclosed herewith as (Annexure-XI).
The PCSC forum noticed that NPCIL, MAPS was not sending the data
even with the sufficient number of reminders and the issue would be
taken up in the higher forum for compliance.
21. It was agreed that any change in the system configuration etc ( LILO etc) are to be highlighted and brought to attention in the monthly PCC Meetings on a regular basis. This would enable utilities to take up any change in the relay settings on account of the revised configuration.
22. Date & Venue of the next Meeting
The 27th PCSC meeting would be conducted on 19.12.2013 (Thursday) at
SRPC Bangalore.
The 28th PCSC meeting is scheduled to be held in Toranagallu, Karnataka
on 24th January 2014 (Friday) and would be hosted by JSWEL.
Member Secretary i/c thanked all the Members & participants for their active
contribution in the Meeting.
*****