SIZE DWG NO SH REV

A 397A3178 1 -
THIRD ANGLE PROJECTION REVISIONS
REV DESCRIPTION DATE APPROVED
- Initial Issue 10JUN2010 SEE PLM
ECO-0003116
THIS DOCUMENT SHALL BE Xue Xia
REVISED IN ITS ENTIRETY.
ALL SHEETS OF THIS
DOCUMENT ARE THE SAME
REVISION LEVEL AS
INDICATED.

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The
c
information contained herein is GE Energy Generator Proprietary Technical Information that
belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has
been provided solely for the express reason of restricted private use. All persons, firms, or
corporations who receive such information shall be deemed by the act of their receiving the same
to have agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such
information except as expressly authorized in writing by the General Electric Company, GE Energy
(USA), LLC and/or its affiliates.

GE CLASS II ( INTERNAL NON CRITICAL )

UNLESS OTHERWISE SPECIFIED SIGNATURES DATE GENERAL ELECTRIC COMPANY

DIMENSIONS ARE IN INCHES DRAWN g
TOLERANCES ON: Summer Xia 10JUN2010
GE ENERGY
2 PL DECIMALS + CHECKED SCHENECTADY, NY
See PLM
3 PL DECIMALS + ENGRG
See PLM
STATIC STARTER ANALYSIS
(UAT Short Circuit MVA & Cable Sizing Requirements)
ANGLES + ISSUED
See PLM
FRACTIONS +
FIRST MADE FOR: 9F MS GAS Turbine MLI: 40SS
APPLIED PRACTICES SIZE CAGE CODE DWG NO

A 397A3178
SIM TO: SCALE SHEET 1 OF 11
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1.0 Scope
This document (MLI:40SS) provides operational guidance for customer interface with the GE gas
turbine static starting system for a 9F MS GAS Turbine. The main components in the static starting
system are; a 12 pulse LCI (Load Commutated Inverter, LS2100), a 3-winding isolation transformer,
AC reactor, DC reactor, protective fuses, and disconnect switches. Some of the components that are
part of the static starting system will be in the customer or architect engineer scope of supply. As a
result, GE uses this document to communicate the specific requirements for this equipment. The
equipment in the customer or architect engineer scope of supply includes:

1. Power Cables
2. Unit Auxiliary Bus System

Power Cables:
There are several cable runs in the customer or architect engineer scope of supply. GE provides
recommended current rating, voltage rating, maximum number of conductors and shielding type for
the power cables.

The cable runs are defined as follows:

• A) From LCI / fuse / 89MD to 89SS / (generator)

• B) From LCI / fuse / 89MD to AC reactor
• C) From AC reactor to LCI load bridge (inverter)
• D) From DC link reactor to LCI load bridge (inverter)
• E) From LCI source bridge (converter) to DC link reactor
• F) From isolation transformer secondary windings to LCI source bridge (converter)
• G) From unit auxiliary bus to isolation transformer primary winding

Additional references and requirements for cables can also be found in the Cable Installation Data,
Turbine Control (MLI:0435) and Cable Summary (MLI: 0463). If there is a discrepancy between
this document (MLI: 40SS) and the Cable Installation Data, Turbine Control and Cable Summary,
please contact GE for recommendations.

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 2 OF 11
SIZE DWG NO SH REV
A 397A3178 3 -

Unit Auxiliary Bus System:

In order to ensure proper operation of the Gas Turbine Static Starting System, GE recommends
measurement of Short Circuit MVA from a point on the Unit Auxiliary Bus System. Harmonics are
produced by the LCI 12 pulse source bridge and transmitted to the unit auxiliary bus. GE
recommended Short Circuit MVA ensures compliance with ANSI IEEE 519 Total Harmonic
Distortion (THD) limits.

2.0 Static Starter Operational Overview

All gas turbine static starting systems follow the same 5 phases of operation. Each phase of
operation is described below:

Acceleration to Purge Phase

After all starting permissives are satisfied; the unit begins the Acceleration to Purge Phase. The
static starter accelerates the train from turning gear (3-6 rpm) to 30% speed in about 2 minutes .

Note: Shaft train acceleration is achieved by applying variable frequency voltage and current
to the generator stator winding which produces generator rotor torque. In general, the higher the
current in the generator stator winding the higher the torque on the generator rotor. While
applying the stator current, the Load Commutated Inverter (LCI, LS2100) provides the proper
stator voltage levels based on output frequency to ensure that the proper V/HZ limits for the
generator are maintained.

Purge Phase
After Acceleration to Purge phase, the static starting system begins the Purge phase. This phase
varies from unit to unit, depending on the Gas Turbine exhaust plenum size. Units with HRSG
require longer purge times. Turbine Controls Constant K2TV found in the Control Constants
Document (MLI:A010) specifies the exact purge time for the job specific unit. During the Purge
phase the unit wobbulates to avoid amplification of any train critical.

Coast Down Phase

After the Purge phase times out, the unit is allowed to coast down from 30% to 14% speed. This
takes approximately 2 minutes and no power is applied by the static starter at this time

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 3 OF 11
SIZE DWG NO SH REV
A 397A3178 4 -

Firing Phase
When the turbine train speed reaches 14% as it decelerates during the Coast Down phase, the static
starting system switches to the Firing phase. The static starter holds the unit at 14% speed for
approximately 1 minute and ignites the combustors.

Acceleration to Full Speed Phase

After the Firing phase, the static starting system switches to the Acceleration to Full Speed phase.
The Static Starting system accelerates the train from 14% speed to 90% speed in approximately 5 to
6 minutes. During this phase, the gas turbine also contributes torque to the acceleration of the train.
However, the static starter stays on until the speed reaches 90% speed where the Gas Turbine is self-
sustaining. At this point the static starter is disconnected and the GT takes the unit to 100% speed.

3.0 Graphs and Tables from Static Starter Simulation

The following graphs show the 5 phases of static starter operation developed from a simulation. The
first set of graphs shows the Motor Power versus Time. This is the power applied to the Generator
Stator Winding by the static starting system. In these curves, the Motor Power equals the Stator Voltage
(Volts LL) times Stator Current (AC Amp RMS LN) times 1.73. The second set of graphs show the
generator rotor speed versus time.

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 4 OF 11
SIZE DWG NO SH REV
A 397A3178 5 -

Motor Power and Speed Curves for

9F MS Gas Turbine

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 5 OF 11
SIZE DWG NO SH REV
A 397A3178 6 -

The following 5 tables show data points from the 5 phases of static starter operation. These tables are
simulated values of Time versus RPM, Motor Power, Stator Amps, Stator Volts, KWH.

Data Table of Time versus RPM, Motor Power, Stator Amps, Stator Volts, KWH
For 9F MS Gas Turbine

P o w e r C o n s u m e d D u r in g A c c e le r a tio n to P u r g e S p e e d :-
T o ta l T im e M in . P e r -U n it R P M M o to r P o w e r , K W S ta to r A m p s ,IS S ta to r V o lts ,V L L KWH
0 .0 0 0 0 .0 1 1 1 1 .1 7 600 1 1 8 .9 0 0 .0 0
0 .2 2 7 0 .0 4 4 4 4 .6 7 600 4 7 5 .4 0 1 .0 5
0 .4 8 4 0 .0 8 8 8 9 .3 4 600 9 5 0 .9 0 2 .8 6
0 .7 3 0 0 .1 2 1 3 3 4 .0 2 600 1 4 2 6 .3 0 4 .5 6
0 .9 1 9 0 .1 5 1 6 6 7 .5 2 600 1 7 8 2 .9 0 4 .7 3
1 .1 8 9 0 .1 9 2 1 1 2 .1 9 600 2 2 5 8 .3 0 8 .5 0
1 .3 3 6 0 .2 1 2 3 3 4 .5 3 600 2 4 9 6 .0 0 5 .4 5
1 .6 6 1 0 .2 5 3 0 1 0 .8 0 650 2 9 7 1 .4 0 1 4 .4 8
1 .9 1 7 0 .2 8 3 6 8 3 .3 7 710 3 3 2 8 .0 0 1 4 .2 8
2 .0 9 7 0 .3 0 4 1 6 8 .8 0 750 3 5 6 5 .7 0 2 8 .5 3
T o ta l = 8 4 .4 3
P o w e r C o n s u m e d D u r in g P u r g e T im e : -
T o ta l T im e M in . P e r -U n it R P M M o to r P o w e r , K W S ta to r A m p s ,IS S ta to r V o lts ,V L L KWH
0 0 .3 0 2 5 6 1 .7 1 4 6 0 .9 0 3 5 6 5 .5 0 0 .0 0
15 0 .3 0 2 5 6 1 .7 1 4 6 0 .9 0 3 5 6 5 .5 0 6 4 0 .4 3
T o ta l = 6 4 0 .4 3

P o w e r C o n s u m e d D u r in g C o a s t D o w n to F ir in g
T o ta l T im e M in . P e r -U n it R P M M o to r P o w e r , K W S ta to r A m p s ,IS S ta to r V o lts ,V L L KWH
0 0 .3 0 0 .0 0 0 .0 0 0 .0 0 0 .0 0
2 0 .1 4 0 .0 0 0 .0 0 0 .0 0 0 .0 0
T o ta l = 0 .0 0
P o w e r C o n s u m e d D u r in g F ir in g T im e :-
T o ta l T im e M in . P e r -U n it R P M M o to r P o w e r , K W S ta to r A m p s ,IS S ta to r V o lts ,V L L KWH
0 0 .1 4 2 2 1 .5 2 7 3 .2 0 1 9 4 1 .3 0 0 .0 0
2 0 .1 4 2 2 1 .5 2 7 3 .2 0 1 9 4 1 .3 0 7 .3 8
T o ta l = 7 .3 8

P o w e r C o n s u m e d D u r in g A c c e le r a tio n to F u ll S p e e d :-
T o ta l T im e M in . P e r -U n it R P M M o to r P o w e r , K W S ta to r A m p s ,IS S ta to r V o lts ,V L L KWH
0 .0 0 0 0 .1 4 1 5 5 6 .3 5 600 1 6 6 4 .0 0 .0 0
0 .2 9 9 0 .1 9 2 1 1 2 .1 9 600 2 2 5 8 .3 9 .1 4
0 .4 1 7 0 .2 1 2 3 3 4 .5 3 600 2 4 9 6 .0 4 .3 7
0 .6 7 3 0 .2 5 3 0 1 0 .8 0 650 2 9 7 1 .4 1 1 .4 0
1 .0 0 4 0 .3 0 4 1 6 8 .6 0 750 3 5 6 5 .7 1 9 .8 0
1 .3 2 5 0 .3 5 5 5 1 2 .0 8 850 4 1 6 0 .0 2 5 .9 0
1 .4 5 5 0 .3 7 5 7 7 1 .4 7 890 4 1 6 0 .0 1 2 .2 2
1 .8 2 3 0 .4 2 6 4 1 9 .9 5 990 4 1 6 0 .0 3 7 .3 9
2 .2 6 6 0 .4 7 7 0 6 8 .4 3 1090 4 1 6 0 .0 4 9 .7 9
2 .7 9 4 0 .5 2 7 7 1 6 .9 1 1190 4 1 6 0 .0 6 5 .0 6
3 .3 9 0 0 .5 7 8 3 6 5 .3 9 1290 4 1 6 0 .0 7 9 .8 8
3 .8 7 2 0 .6 1 8 8 8 4 .1 7 1370 4 1 6 0 .0 6 9 .2 9
4 .3 1 0 0 .6 5 9 4 0 2 .9 6 1450 4 1 6 0 .0 6 6 .7 5
4 .7 5 7 0 .7 0 9 7 2 7 .2 0 1500 4 1 6 0 .0 7 1 .2 6
4 .9 8 2 0 .7 3 9 7 2 7 .2 0 1500 4 1 6 0 .0 3 6 .4 8
5 .1 7 6 0 .7 6 9 7 2 7 .2 0 1500 4 1 6 0 .0 3 1 .4 5
5 .3 4 1 0 .7 9 9 7 2 7 .2 0 1500 4 1 6 0 .0 2 6 .7 5
5 .4 3 8 0 .8 1 9 7 2 7 .2 0 1500 4 1 6 0 .0 1 5 .7 3
5 .6 3 9 0 .8 5 5 4 0 1 .8 4 833 4 1 6 0 .0 2 5 .3 4
5 .8 1 5 0 .8 8 2 1 5 9 .4 4 333 4 1 6 0 .0 1 1 .0 9
5 .9 4 5 0 .9 0 0 .0 0 0 4 1 6 0 .0 2 .3 4
T o ta l = 6 7 1 .4 2

T o ta l P o w e r( K W H ) C o n s u m e d D u rin g S ta rtin g (A p p ro x .) :- 1 4 0 3 .6 6

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 6 OF 11
SIZE DWG NO SH REV
A 397A3178 7 -

4.0 Static Starter Analysis and Calculations

4.1 Cable Sizing Analysis

For sizing the cable runs, GE’s requirements are based on the maximum value of current and voltage
seen during the static starting operation. For all 5 phases of static starter operation shown in section
3.0 we can see that the Acceleration to Full Speed is the most demanding phase of operation.

From the Acceleration to Full Speed curve we can see that 1500 Amps AC supplied at 4160 VAC LL
is the maximum operating point. This is the maximum power output of the LCI. We will use this
operating point to calculate the rated currents and rated voltages for all cable runs throughout the static
starting system. In addition, the static starting system must also be capable of an unlimited number of
successive starts and all supporting hardware must meet this requirement.

There may be additional factors affecting cable sizing (type of cables, routing, proximity to other
equipment, installation location in tray, conduit in air, conduit in soil etc.) These factors must be
considered. The customer and/or architect engineer is ultimately responsible for selecting the static
start system power cables that meet the requirements of these guidelines.

To minimize stray capacitance coupling of high frequency harmonics and to comply with codes and
standards around the world, such as NEC 2005, GE is recommending Shielded Cables on all power
cable runs in the static starting system.

Cable runs, which are between LCI output and generator, may introduce excessive cable to ground
capacitance when using long shielded cables. GE will provide an AC reactor on every application to
ensure proper LCI operation and to compensate for excessive capacitance. With an AC reactor, the
allowable cables(per phase) to ground capacitance of this section can be up to 0.5uF maximum.

For cables between isolation transformer and DC link reactor, the excessive capacitance can not be
compensated. Care must be exercised such that the DC link reactor and isolation transformer are
located in close proximity to the Static Starter to avoid cables(per phase or per pole) to ground
capacitance over 0.125uF.

Additionally, shielded cable shall not be grounded at the Static Starter cabinet in order to avoid
electrical noise, which can corrupt the control signals and cause loss of control or it can prevent the
Static Starter from operating properly. Please refer to GEH-6678 and MLI 0435 documents for static
start system cable shield grounding information

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 7 OF 11
SIZE DWG NO SH REV
A 397A3178 8 -

4.1.1 Cable Run Current Calculations

Cable Run A
(From LCI fuse / 89MD to 89SS )
After reviewing the table in section 3, the Cable Run A maximum current is simply the maximum
Stator current with 15% safety margin. We use the following formula;

Cable Run A = (Max. Stator Current) x (Safety Margin Factor)

Cable Run A = (1500 amps) x (1.15) = 1725.00 Amps AC RMS

Cable Run B
(From LCI fuse / 89MD to AC reactor)
This is basically the same cable run as Cable Run A, Cable Run B will have the same current
requirement as Cable Run A.

Cable Run B = (1500 amps) x (1.15) = 1725.00 Amps AC RMS

Cable Run C
(From AC reactor to LCI load bridge)
Since Cable Run C is just the return leg of Cable Run B, if we assume 100% efficiency in the AC
reactor, we simply use the same current value as calculated in Cable Run B.

Cable Run C = (1500 amps) x (1.15) = 1725.00 Amps AC RMS

Cable Run D
(From DC link to LCI load bridge)
After reviewing the table in section 3, the DC cable run maximum current is determined by
selecting the maximum Stator current and back calculating the corresponding DC current. We
use the following formula:

Cable Run D = (Max. Stator Current) x (AC to DC Conv. Factor) x (Safety Margin Factor)
Cable Run D = (1500 amps) x (1.2825) x (1.15) = 2212.31 Amps DC

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 8 OF 11
SIZE DWG NO SH REV
A 397A3178 9 -

Cable Run E
(From LCI source bridge to DC link reactor)
Since Cable Run E is just the return leg of Cable Run D, we simply use the same current value as
calculated for Cable Run D

Cable Run E = (1500 amps) x (1.2825) x (1.15) = 2212.31 Amps DC

Cable Run F
(From isolation transformer secondary windings to LCI source bridge)
In general the power into the LCI is the same as the power out of the LCI assuming 100%
efficiency. For this incoming cable run, the voltage is 2080VAC LL which is 50% of the 4160
VAC LL of the outgoing Cable Run A, however, the load is also split by a isolation transformer
with a 2 winding secondary, therefore, these two factors cancel each other out. As a result, Cable
run F will have the same current requirement as Cable Run A.

Cable Run F = Cable Run A = (Max. Stator Current) x (Safety Margin Factor)
Cable Run F = (1500 amps) x (1.15) = 1725.00 Amps AC RMS

Cable Run G
(From unit auxiliary bus to isolation transformer primary winding)
In general the power into the isolation transformer is the same as the power out of the isolation
transformer assuming 100% efficiency. For this incoming cable run, the voltage is higher than
the secondary side voltage and there is only 1 primary winding versus 2 secondary windings .
Therefore the current can be reduced by the ratio of Primary to Secondary side ratio voltage.
However, it must be adjusted by 2x due to the fact that there is 1 primary side winding versus 2
secondary windings.

Cable Run G = (Cable Run A Current) x ( 4160V / Vpri)

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 9 OF 11
SIZE DWG NO SH REV
A 397A3178 10 -

4.1.2 Power Cable Sizing:

Based on the static starter power cable analysis for this application, the recommended power cable
sizing is as follows:

Table #1: Power Cable Sizing Information

Cable Voltage Class Max Current Number of Cable Max

Runs * (recommended) Per phase/pole ** conductors / Type Allowed
phase or / Cable(per
pole phase/pole )
(max.) to Ground
Capacitance
A 8kV 1725.00 Amps AC RMS 3 Shielded 0.5uf
B 8kV 1725.00 Amps AC RMS 3 Shielded 0.5uf
C 8kV 1725.00 Amps AC RMS 3 Shielded 0.5uf
D 8kV 2213.00 Amps DC 3 Shielded 0.125uf
E 8kV 2213.00 Amps DC 3 Shielded 0.125uf
F 8kV 2243.00 Amps AC RMS 3 Shielded 0.125uf
G Based on project Based on project MV bus 3 Shielded Not required
MV bus rating rating
* Refer section 1.0(scope) for the Cable Run definition.
** 1) The max current will only last less than 3 minutes, please refer to load profile (section 3) for
exact time duration.
2) The customer is responsible for sizing the cables based on information in section 3. All cable
capacity derates per the applicable codes and standards must be considered when using multiple
conductors for site specific ambient conditions and routing practices (i.e trench, conduit, tray, etc)

4.2 Recommended Unit Auxiliary Bus System

Based on the static starter harmonic analysis for this application, the recommended Unit
Auxiliary Bus System short circuit MVA requirement to maintain THD levels per IEEE 519-
1992 is as follows:
220 MVA (recommended)

© COPYRIGHT 2010 GE ENERGY (USA), LLC AND/OR ITS AFFILIATES. All rights reserved. The information contained herein is GE Energy Generator Proprietary
Technical Information that belongs to the General Electric Company, GE Energy (USA), LLC and/or their affiliates, which has been provided solely for the express
reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have
agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by the General
Electric Company, GE Energy (USA), LLC and/or its affiliates.
GE CLASS II ( INTERNAL NON CRITICAL )

GENERAL ELECTRIC COMPANY SIZE CAGE CODE DWG NO

g 397A3178
GE Power Generation SCHENECTADY, NY
A
DRAWN Summer Xia
ISSUED See PLM SCALE SHEET 10 OF 11
SIZE DWG NO SH REV
A 397A3178 11 -

4.2.1 Short Circuit MVA Analysis

This is a standard harmonic calculation done for a 12 pulse load commutated inverters. Below
input is required for this calculation:
• Auxiliary bus voltage
• LCI load bridge inverter current, this is the LCI output current
• LCI load bridge inverter Voltage (kV), this is the LCI output voltage.

THD Calculations for 12 Pulse LS2100

GE Recommended Minimum Bus Short Circuit MVA: 220 220 220 220 220 220 12 Pulse Harmonic Content
*Bus Line Voltage (kV): 6.00 6.30 6.60 6.90 10.50 11.00 (11° firing angle, with a 7000KVA isolation transformer@6% impendence)
Harmonic Allowed H *** Allowed H
Bus Short Circuit Current (kA): 21.17 20.16 19.25 18.41 12.10 11.55 H Order Current (%) Current Dist (%)Current (A)Voltage (V) Voltage (%) V Dist(%)**
Bus Short Circuit Impedance (Ohms): 0.16 0.18 0.20 0.22 0.50 0.55 5 1.83 2.63 19.05 15.59 0.45 4.5
Inverter max (overload) current: 1500 1500 1500 1500 1500 1500 7 1.14 2.63 11.86 13.59 0.39 4.5
Inverter Voltage (kV): 4.16 4.16 4.16 4.16 4.16 4.16 11 5.36 7.42 55.70 100.25 2.89 4.5
Bus Base Current at LS2100 max load (A): 1040.00 990.48 945.45 904.35 594.29 567.27 13 3.30 7.42 34.32 73.01 2.11 4.5
11° Voltage THD: Limit 7.5% ** 4.07% 4.07% 4.07% 4.07% 4.07% 4.07% 17 0.13 0.94 1.34 3.73 0.11 4.5
11° Current THD: Limit 12% *** 6.78% 6.78% 6.78% 6.78% 6.78% 6.78% 19 0.07 0.94 0.77 2.39 0.07 4.5
Ratio Isc/IL at Bus (PCC) 20.36 20.36 20.36 20.36 20.36 20.36 23 0.85 2.12 8.81 33.16 0.96 4.5
Note: 1) Isc/IL<20, current THD limit=7.5% 25 0.78 2.12 8.16 33.37 0.96 4.5
2) If 20<=Isc/IL<50, current THD limit=12% 29 0.08 0.38 0.84 4.00 0.12 4.5
3) If 50<=Isc/IL<100, current THD limit=18% 31 0.06 0.38 0.60 3.05 0.09 4.5
35 0.38 1.06 3.93 22.49 0.65 4.5
37 0.22 1.06 2.26 13.70 0.39 4.5
41 0.03 0.19 0.28 1.88 0.05 4.5
43 0.02 0.19 0.24 0.00 0.00 4.5
47 0.34 1.06 3.54 27.21 0.79 4.5
49 0.23 1.06 2.44 19.54 0.56 4.5

* Different bus line voltages can also be applied to above table without impacting final result
** Limits taken from Table 11.1, IEEE 519-1992, and taking into account the 50% increase allowed for short duration according to article 11.5
*** Limits taken from Table 10.3, IEEE 519-1992, and taking into account the 50% increase allowed for short duration as outlined in article 10.4.
Row two in Table 10.3 is used because Isc/IL >20 and the LS2100 is used as a load device rather than for generating power for the utility.
The LS2100 typically runs at a small firing angle during peak current operation.
The static start application requires maximum current for only a short period of time (usually only a few minutes).
Therefore the actual voltage THD imposed by IEEE 519 is 7.5%. This allows for a smaller short circuit MVA rating.
Voltage HD = Bus Base Current * Bus Short Circuit Impedance * Harmonic Order * Per Unit Current
Voltage THD = (Sqrt(Sum (Voltage HD)^2))/(1000*VLL/SQRT(3))
Bus Short Circuit Impedance (ohms) = (VLL kV)^2/(Bus MVAscc)
Voltage (%) = (Voltage/(1000*Bus Line Voltage/SQRT(3)))
Current (A) = Bus Base Current * Current %/100
Current THD = (Sqrt(Sum(Current HD)^2))/(Bus Base Current)
Isc/IL=Bus Short Circuit Current/Bus Base Current

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