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Page 1

Project:
印度 TIRODA(提隆达)3×660MW 燃煤电站

TIRODA THERMAL POWER PROJECT
1980 MW (2x660 MW Phase - I+1x660MW Phase-II)

Tiroda, Gondia District, Maharashtra
Owner:

ADANI POWER MAHARASHTRA PRIVATE LIMITED
TIRODA, MAHARASHTRA

Owner’s Consultant :

FICHTNER Consulting Engineers (India) Private Limited
and BLACK & VEATCH

Vendor:

SICHUAN MACHINERY & EQUIPMENT IMP. & EXP. CO., LTD

SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE
APMPL DOC.NO. Revision

TIR1-CBE-OTH-BE-X-001 0
PROJECT DOC. TITLE :


DESIGN BASIS REPORT FOR ELECTRICAL PART



DOC. NO.:

50-F303C-D01-01
Revision 0

APPROVAL STATUS :








1 2009.04






REVISDE AS PER APML'S
COMMENTS

0 2008.11








FIRST REVISION

INITIALS SIGN INITIALS SIGN INITIALS SIGN DETAILS OF REVISION
REV DATE

PREPARED CHECKED APPROVED

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CONTENTS



CLAUSE NO. DESCRIPTION PAGE No

1 GENERAL DESCRIPTION········································································································································· 5

1.1 INTENT OF DESIGN BASIC REPORT················································································································· 5

1.2 SCOPE OF DESIGN················································································································································ 5

1.3 DESIGN PHILOSOPHY ·········································································································································· 5

2 ELECTIC CONNECTION··········································································································································· 6

2.1 SLD FOR MAIN CONNECTION····························································································································· 6

2.2 SLD FOR HV-LV AUXILIARY POWER SYSTEM ······························································································ 7

3 SHORT CIRCUIT CURRENT CALCULATION AND EQUIPMENT ELECTION············································ 12

3.1 RESULT OF SHORT CIRCUIT CURRENT CALCULATION ········································································· 12

3.2 PARAMETERS OF MAIN EQUIPMENT ············································································································ 13

4 GENERATOR AND EXCITATION ·························································································································· 19

4.1 TYPE OF GENERATOR ········································································································································ 19

4.2 RATING····································································································································································· 19

4.3 DESIGN CRITERIA ················································································································································ 20

4.4 EXCITATION SYSTEM ········································································································································· 20

5 DESCRIPTION OF ELECTRIC EQUIPMENT LAYOUT··················································································· 21

5.1 LAYOUT OF GENERATOR OUTPUT SYSTEM ······························································································ 21

5.2 LAYOUT OF GT UT & ST ····································································································································· 21

5.3 LAYOUT OF 400KV SWITCHYARD ·················································································································· 21

5.4 LAYOUT OF 220KV SWITCHYARD··················································································································· 22

5.5 LAYOUT OF HV/LV SWITCHGEAR ··················································································································· 22

6 DC SYSTEM & UPS··················································································································································· 23

6.1 DC SYSTEM···························································································································································· 23

6.2 UPS ·········································································································································································· 24

7 ELECTRICAL PROTECTION & CONTROL & AUTOMECHANISM ······························································· 25

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frequency withstand
voltage

(6) Short circuit current
rating and duration

40kA for 1 sec 40kA for 1 sec

(7) Momentary withstand
current

100kA(peak) 100kA(peak)

(8) System neutral
earthing

Resistance earthed Resistance earthed

(9) Material of bus bars Aluminium Aluminium

(10) Enclosure IP4X IP4X

3.2.4.2 LV switchgear

415/240V

(1) Type indoor, metal clad

(2) Nominal voltage 415V

(3) phases and frequency 3-phase,4-wire 50Hz

(4) One minute power
frequency withstand
voltage

2.5kV(rms)

(5) Short circuit current
rating and duration

50kA for 1 sec

(6) Momentary withstand
current

125kA(peak)

(7) System neutral
earthing

Solidly earthed

(8) Material of bus bars Aluminium

(9) Enclosure IP-54



4 Generator and excitation

4.1 Type of generator

The synchronous generator shall be hydrogen/water cooled and directly driven by the

steam turbine at 3000 rpm.The Generator shall be 3 phase, 2 pole, with phase and

neutral terminals brought out for connection to isolated phase bus duct.

4.2 Rating

(1) Type QFSN-660-2

(2) Rated output 660MW

(3) Power factor 0.85(lagging)

(4) Terminal voltage 22kV

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(5) Frequency 50Hz

(6) Short Circuit Ratio Not less than 0.48

(7) Class of Insulation


Class F but limited to
class B temperature rise

(8) Efficiency 98.8%

(9) The maximum

continuous rating

Correspond to the output

of turbine

(10) Cooling system

Stator coil Water inner-cooled

Rotor coil Hydrogen inner-cooled

Stator core Hydrogen cooled

4.3 Design Criteria

The Generator shall be capable of withstanding, without injury, a three phase short

circuit at the terminals for three (3) seconds when operating at the rated output and

power factor, at 5% over voltage with fixed excitation.

Generator shall be capable of continuous operation at rated output through out the

frequency range of 47.5 to 51.5 Hz and voltage range of of +/-5% or absolute sum of

combined voltage and frequency variation of 5% without exceeding class B temperature

limits.

4.4 Excitation system

A complete generator excitation and voltage regulating system shall be provided with the

generator. The excitation system shall be static and the excitation system shall meet the

performance requirements of generator.

The excitation system provides control of generator terminal voltage by controlling

current supplied to the generator field. The AVR shall be digital type and have dual

automatic channels with a follow-up control to ensure a smooth change-over from one to

another. AUTO/MANNUAL control mode shall be provided. Some of the protective and

limit circuits are volts/hertz regulator, reactive current compensator, over excitation/

under excitation limiters, and field earth detection, and power system stabilizer and so on.

Excitation transformer shall be dry type and starting power of excitation shall be supplied

from 415V auxiliary system.

The excitation system is consists of the following main equipments: Excitation

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lighting distribution box shall be surface mounted in main building and built-in mounted in

office and control building area. It shall be provided with a incoming circuit breaker .The

branch circuit breaker shall be of miniature molded case, The lighting distribution box

shall be in modular steel structure with front lockable hinged door.RCCB(residual current

circuit breaker) to be provided with only socket circuits for protection against earth

leakage.

9.4 Cable, Wire

The roadway lighting cables shall be PVC insulated, steel strip armoured and PVC

sheathed overall.

The connection cable between lighting distribution box and aircraft warning lighting

fixtures shall be PVC insulated, steel wire armored and PVC sheathed overall.

The PVC insulated copper wire shall be used in other area. The branch circuit cable

section shall be of minimum 2.5mm2.

9.5 Raceway

The lighting wire shall be laid in hot-dip galvanized steel pipe .

The minimum diameter of hot-dip galvanized steel pipe shall be 20mm.

The conduit in turbine house and boiler house shall be generally exposed and embedded

where is subject to mechanical injury.

The sealed junction box shall be provided in exposed conduit system.



10 Cables & Cabling

10.1 Cables

(1) HV Cables

11kV and 6.6kV unearthed grade cables shall be used for the plant as HT cables. HT

cables shall be unearthed grade with stranded & compacted aluminium conductors,

extruded XLPE insulated. HV Cables shall have FRLS PVC outer sheath. Buried cables

shall be armoured type.

(2) LV Cables

LT Power Cable shall be 1100 V grade, single / multicore, stranded aluminium conductor,

XLPE insulated, with FRLS PVC inner sheath and outer sheath made of FRLS PVC.

(3) Control Cables

Control cables shall be 1100V grade, multicore, high conductivity annealed plain copper

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conductor, Extruded PVC insulated, with Extruded PVC inner sheath and outer sheath

made of Extruded FRLS PVC.

10.2 Cabling

(1) General

Cable racks and cable trenches shall be adopted for cable carrier system. Overhead

racks and cable trenches shall be of different sizes depending on the number of cables

laid in that route.

(2) Cable tray

All cable trays shall be of ladder type construction and be made of galvanized steel.

Spacing between the cable tray supports shall be not more than 1500 mm, except fittings

(elbows, tees, etc.) which shall be supported at each splice.

Cable tray fittings shall have a radius equal to or greater than the minimum bending

radius of the cables they contain. At least a 150 mm clearance shall be maintained

between the top of a tray and beams, piping, or other obstacles to facilitate installation of

cables in the tray.

(3) Conduit

Conduit systems shall be used in supporting and protecting electrical cable. Galvanized

rigid steel conduit shall be used for all conduit

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