report 130910 edited

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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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


Method of neutral point connection= Resistance earthed

Nominal Voltage = 0.433 KV


Method of neutral point connection= Solidly earthed


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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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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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7

Short Circuit Report


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8


8

tribution System

8


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9


9

tribution System

9


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1 0


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1 1

Setting Details for Relay and

Control Panel


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1 2


13/26


1 3


14/26


1 4


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1 5


1 5

tribution System

1 5


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1 6


1 6

tribution System

1 6


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1 7


1 7

tribution System

1 7


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1 8

Setting DetailsFor

11kV Switch Gear Panel


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1 9


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2 0


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2 1


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2 2


2 2

tribution System

2 2


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2 3


2 3

tribution System

2 3


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2 4

Time Current Characteristic

Curves


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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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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)

report 130910 edited

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