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7/30/2019 Report 130910 Edited
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POWER SYSTEM
PROTECTIONCOORDINATION
REPORT FOR
1 x 8MVA,66/11
kV Transformer
station and 11kV
Distribution
Client:
M/s REID and TAYLOR, Nanjangud, Mysore
Project:
1 x 8MVA, 66/11 kV Transformer station and 11kV
Distribution System
EPC Contractor
SIEMENS LTD, Chennai, India
Compiled and Study made by
Interface Electronics Pvt Ltd,
5, Nana Street, T.Nagar, Chennai, India
9884370326
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
Compiled by Interface Electronics Pvt Ltd for Siemens Ltd, Chennai
2
Contents
1 Introduction 3
2 Network- and Single Line Diagrams 4
3 In feed Data 4
4 Single Line Diagram 5
5 Device details 6
6 Short circuit Current Details 7
7 Detailed calculations for Transformer Protection 10
8 Setting Details for Relay and Control Panel 11
9 11 kV HT Switchgear Panel 18
10 Time Current Character Curves 24
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
3
Introduction
Interface Electronics pvt ltd was requested to prepare a protection co-ordination report for 1 X 8 MVA ,66/11 kV
Transformer Station and 11 kV Distribution for the Project of Reid and Taylor at Nanjangud,Mysore .This Project is
executed by M/s Siemens Ltd, CHENNAI.
This report includes calculation results of the study 66/11switchgear.
The system data for calculation are based on the provided data by M/s Siemens ltd, Chennai.
The most important tool for documentation of over current protection co-ordination is Paladin Design Base 3.
Typical grading paths have been chosen in a single line and in a current/time diagram the selectivity of the
characteristic curves of the devices are shown.
2 Power System Data
The following single line diagrams, data collection and papers were used as data input and data base for this network
calculation study.
2.1 Network- and Single Line Diagrams
Following diagrams /documents were made available to us : for making the study
2.2 General Power System Data
Nominal Voltage = 66 KV
Nominal Frequency = 50 Hz
Method of neutral point connection= Solidly earthed
Nominal Voltage = 11 KV
Nominal Frequency = 50 Hz
Method of neutral point connection= Resistance earthed
Nominal Voltage = 0.433 KV
Nominal Frequency = 50 Hz
Method of neutral point connection= Solidly earthed
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
Compiled by Interface Electronics Pvt Ltd for Siemens Ltd, Chennai
4
2.3 Infeed Data
Short-circuit power 3-phase @ Karakul SS 66 kV 1877 MVA
Short-circuit power 3-phase @ Dhavanur SS 66 kV 664.7MVA
Method of neutral point connection= Solidly Earthed
Line tap is taken @ 4 km from Kadoka SS on the line between Kadakola and Dhavanur SS
3.0 Protection Coordination
Based on the short circuit calculations protection coordination study was carried out for this Project
Short circuit currents calculated for each of the bus bar is tabulated.
Selectivity of relays have been worked out only for 66 kV Relay and control Panel and for the Incomer of 11 kV
Switchgear panel only .The settings for Outgoing feeders and the DG incoming Feeders have been retained with the
existing settings.
4.0 Conclusion
Setting sketches for the over current devices have been performed for the 66/11 kV network The selectivity of the
protection settings for characteristic feeders was verified with the protection grading diagrams prepared with
software Paladin Design base 3 Generally, attention was given to provide the largest possible safety clearance
between the individual protective devices..
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
Compiled by Interface Electronics Pvt Ltd for Siemens Ltd, Chennai
5
Single Line Diagram
GRID
KPCL
50
51
Relay_HVside
Power Transformer
5051
Relay LVside
11kV Switch Gea
GENG1
5051
12
DG1 Panel 14
5051
15
Cable:DG1_11kVSWGR
5051
18
GENG2
5051
21
DG2 Panel
5051
23
Cable:DG2_11k
VSWGR
5051
26
50
51
28
Existing Transformer 1
50
51
31
Existing Transformer 2
Kadakola SS
Transmission Line
Reid&taylor SS
Cable:ss_11kVswgr
43
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Protection Coordination Report for 1
6
8MVA, 66/11 kV Transformer Station and 11kV Dis
6
tribution System
6
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
Compiled by Interface Electronics Pvt Ltd for Siemens Ltd, Chennai
7
Short Circuit Report
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Protection Coordination Report for 1
8
8MVA, 66/11 kV Transformer Station and 11kV Dis
8
tribution System
8
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9
8MVA, 66/11 kV Transformer Station and 11kV Dis
9
tribution System
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
1 0
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
Compiled by Interface Electronics Pvt Ltd for Siemens Ltd, Chennai
1 1
Setting Details for Relay and
Control Panel
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
1 2
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1 3
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Protection Coordination Report for 1
1 5
8MVA, 66/11 kV Transformer Station and 11kV Dis
1 5
tribution System
1 5
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Protection Coordination Report for 1
1 6
8MVA, 66/11 kV Transformer Station and 11kV Dis
1 6
tribution System
1 6
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1 7
8MVA, 66/11 kV Transformer Station and 11kV Dis
1 7
tribution System
1 7
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
Compiled by Interface Electronics Pvt Ltd for Siemens Ltd, Chennai
1 8
Setting DetailsFor
11kV Switch Gear Panel
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
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2 0
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2 1
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Protection Coordination Report for 1
2 2
8MVA, 66/11 kV Transformer Station and 11kV Dis
2 2
tribution System
2 2
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Protection Coordination Report for 1
2 3
8MVA, 66/11 kV Transformer Station and 11kV Dis
2 3
tribution System
2 3
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
Compiled by Interface Electronics Pvt Ltd for Siemens Ltd, Chennai
2 4
Time Current Characteristic
Curves
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
Compiled by Interface Electronics Pvt Ltd for Siemens Ltd, Chennai
2 511000 Volt Phase Time-Current Characteristic Curves
1 - Path 66 kV side relay-Transformer-11kV side relay
09-13-2010
08:15:20
E:\Local Disk\siemens\ReidTaylor\reidtaylor.PDC
.01
.1
1
10
100
1000
10000
TimeinSeconds
.5 1 10 100 1000 10000Current in Amperes X 10
Relay_HVside
47280SCA@
11000V
(Relay_HVside)
8 MVA Trafo
Inrush
relay LVside
4091SCA@
11000V
(RelayLVsid
e)
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Protection Coordination Report for 1x 8MVA, 66/11 kV Transformer Station and 11kV Distribution System
2 611000 Volt Ground Time-Current Characteristic Curves
1 - Path 66 kV side relay-Transformer-11kV side relay
09-13-2010
08:13:46
E:\Local Disk\siemens\ReidTaylor\reidtaylor PDC
.01
.1
1
10
100
1000
10000
TimeinSeconds
.5 1 10 100 1000 10000Current in Amperes X 10
Relay_LV side
100SCA@
11000V
(RelayLVsid
e)
Relay_HVside :7S
33366SCA@
11000V
(Relay_HVside)