NR - ULDC SCHEME
POINTS OF CONCERN
POINTS OF CONCERN

1. LACK OF REDUNDANCY

2. FREQUENT BUGS IN SCADA SOFTWARE

3. INCOMPLETE REPORTING SYSTEM

4. EMS – INCOMPATIBLE PACKAGES

5. PROLONGED DATA INTERRUPTIONS
DUE TO POWER SUPPLY PROBLEMS

6. SOME IMPORTANT PROJECT SPECIFIC
WORKS STILL PENDING
Data flow in ULDC scheme
SLDC
RSCC
OPERATOR CONSOLE
SLDC
OPERATOR CONSOLE
OPERATOR CONSOLE
RTUs
REPORTING
TO RSCC
RTUs
SLDC
DS
RTUs
REPORTING
TO SLDC
SUBLDC
DS
RTUs
SLDC
ICCP
RTUs
RTUS
REPORTING
TO SLDC
DATA OF
CS &
OTHER
SLDCs
RSCC
ICCP
CPCC
RTUs
SLDC
DS
RSCC
DS
DATA OF CS &
OTHER SLDCs
RTUs
SLDC
ICCP
CS RTUs
REPORTING
TO RSCC
SUBLDC
DS
RTUs
J & K, PUNJAB, BBMB, HPSEB
DELHI
MAIN DATA
J & K, PUNJAB,BBMB,HPSEB
MAIN DATA
S/B DATA
UP SEB
MAIN DATA
S/B DATA
SONEPAT
KANJHAWALA
NAJAFGARH
UPSEB
S/B DATA
PANIPAT
BAWANA
MURADNAGAR
NARELA-JHANGIRPURI- GOPALPUR-WAZIRABAD
-
DADRI HVDC
BAMNAULI
A
PATPARGANJ
DELHI
STD BY
BALLABGARH
IP EXT
OKHLA
SARITA VIHAR
BADARPUR
MALVIYANAGAR
RSCC
VASANT KUNJ
RAJESTHAN
MAIN
MEHRAULI
CRITICAL STATION AFFECTING
COMMUNICATION LINK FROM
SLDCs TO RSCC

MOST CRITICAL STATION AFFECTING ALL MAIN &
STANDBY DATA OF ALL SLDCs : BADARPUR

SECOND MOST CRITICAL STATION AFFECTING MAIN
DATA OF ALL SLDCs
: MURADNAGAR-I
: DADRI HVDC
:BALLABGARH



OUTAGE OF PANIPAT & DHULKOTE WILL ALSO AFFECT
main and standby of ALL SLDCs EXCEPT UP &
RAJASTHAN
SCADA Problems
 CFE
hanging frequently at many locations resulting
into loss of RTU
 Frequent failure of Applications resulting into
failure of DATA SERVERS. Interruption of data and
loss of HIM data.
 In HDR different values at the same time point with
change of sample rate
 In HIM Frequent crashing of Oracle, reset of juke
box,long term storage of Data
 Reports for MIN,MAX,Avg still not available
SCADA Problems
(continued)
 LAN
problem
 Shortcoming in trending functions ( scale , tabular
etc.)
 Frequent tripping of UPS especially at SUBLDC
level.
EMS PROBLEMSRESOURCE SCHEDULING &
COMMITMENT (RSC)
 Scheduling
Philosophy 15 minutes block instead of
hourly.
 Regional and Inter-regional bi-lateral not covered
 Desired treatment of Hydro station not provided
 Share/Entitlement not provided as per requirement
 Unit wise scheduling instead of Plant wise
 No provision of Regional and inter-regional losses.
EMS NETWORK APPLICATIONS
(State Estimation,Contingency
Analysis,Security Enhancement)
 Non-Availability
of Complete Status of CBs and
Isolators through Telemetry.
 Non-Availability of complete Generator data such
as capability curve etc. Database modelled with
typical generators.
DTS -Application
DTS –PROBLEM
UNABLE TO INITIALISE FROM REAL TIME
Recent Problem
Data
is being interrupted in case of outage of standby
Links in spite of availabIlity of Main links.
E.g Outage of sarita Vihar (07.11.03) and Wazirabad
(12.11.03)
Testing was carried out on 11.11.03 by manualy
switching of MCB at Sarita Vihar.
RTU Reporting Status
1. Total RTUs-366
2. RTUs Integrated-333
3. RTUs Reporting- 275
BEMINA SUBLDC HAVING 8 RTUs
NOT INTEGRATED.
Pending important Analog points
1
Gross unit generation data for
Badarpur,Singrauli, Unchahar not available.
 2 Unit generation data of Dadri-Gas, Anta
,Chamera and Auriya not available.
 3 Few line/ICT flows not available.
Pending important Digital points
 1.
NTPC- AURIYA, BADARPUR,DADRI-GAS
 2. POWERGRID- SOME POINTS PENDING.
 3. DTL- 50 % PENDING
 4. UPPCL- 30 % PENDING
 5. RVPNL- 20 % PENDING
PLCC LINK PROBLEM
 1. EITHER MAIN OR STAND BY LINK FOR AGRA,

ALLAHABAD, FARIDABAD –PP, MEERUT,
VINDHYACHAL,ABDULLAPUR, MALERKOTLA,
NALLAGARH AND SRINAGAR NOT WORKING.
2. EITHER MAIN OR STANDBY LINK FOR SALAL,
BAIRASUIL, CHAMERA, URI, ANTA,AURIYA,
UNCHAHAR, NARORA AND RAPP NOT WORKING.