ex2 k hardware tab 3
TRANSCRIPT
GE Power Systems
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EX2000 Hardware Details
GE Power Systems
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Objectives
• Identify all of the system components associated with “your” exciter.
• Be able to locate each component in the GE excitation elementary drawings.
• Describe the function of each system component.
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GE Power Systems
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GE Power Systems
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EX2000 Hot Back Up System
• Hot B/U system is used for redundant applications.
• Usually 2 separate power conversion sections (PCM) that make DC, one is sent to the field, the other to a 200 ohm resistor.
• 3 independent computers. 2 computers are used for control of the bridges. The other for protection.
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EX2000 Hot Back Up System
• The unit is broken up into 2 identical sections: Primary and B/U.
• Each section is broken down into Cabinet Hardware and a Control Core.
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EX2000 Hardware
• The EX2000 Cabinet Hardware consists of:– Manual AC
Disconnect
– DC Disconnect
– DC Shunt
– Control Power Supply
– Power Conversion Section
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Excitation Transformer (PPT)
• Power to the bridges is supplied by an external Excitation Transformer (aka PPT).
• The PPT steps down 4160 vac into either 380/480 vac.
• This low voltage AC source is converted to DC by the SCR’s.
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GE Power Systems
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Manual AC Disconnect
• Disconnects the filtered secondary of the excitation transformer to either the Primary or Backup bridges.
• Molded Case 3-phase, non-automatic, panel mounted switch.
• Normally Rated at 600 vac @ 2500 amps (UL).
• No-Load Disconnect device!
GE Power Systems
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GE Power Systems
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GE Power Systems
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• Functions to convert AC power in DC.
• 6 SCR’s fire at different angles to achieve the desired DC output.
• 12 identical fuses (2/SCR) protect the SCR’s and ensure equal current division.
Power Conversion Module (PCM)
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• 6 Leg Reactors limit current changes through the SCR’s.
• R/C Snubber circuits protect the SCR’s after conduction has stopped.
• Thermal Detectors are mounted on the SCR heat sinks.
• Alarm at 170 oF
• Trip at 190 oF
Power Conversion Module (PCM)
GE Power Systems
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Power Conversion Module
GE Power Systems
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Power Conversion Module (PCM)
GE Power Systems
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Power Conversion Module (PCM)
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Power Conversion Module (PCM)
GE Power Systems
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Blowers
• (3) motor driven fans provide cooling circulation air through the SCR heat sink.
• Power for the motors can come from customer preferred AC or the PPT secondary and stepped down to either 440 or 120 vac.
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DC Current Shunt
• Provides the bridge output current feedback signal to the control core.
• The mV output signal is inputted to a differential amplifier on the DCFB Board.
• Located on the Positive (+) DC bus bar in series with the field.
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DC Current Shunt
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DC Disconnect (MD A and B)
• (MD) Magnetic Disconnect
• Connects the output of the PCM to the field.
• Software Controlled
• Contacts Close at 95% Speed
• Open at 93% Speed
• Can not be Manually Operated
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Control Power Supplies
• Dual Power Supply with 125 vdc and 120 vac customer preferred inputs.
• (1) Power supply per Control Core.
• The power supply provide 120 vdc and 24 vdc power to relays and individual computer boards.
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Control Core
• Consists of 4 printed wiring boards that work as the “BRAIN” for the exciter.
• Calculates the proper amount of excitation and delivers the gate firing signals to the SCR’s.
• The control core will calculate:– Generator Volts,
– Generator Amps,
– MW’s,
– MVARS and pf
– Generator Operating Point
– Protection Alarm and Trip settings
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• This control card is the main processor board.
• Provides SCR circuit control.
• Keypad for Local Operation
• Regulator functions including:– Automatic
– Manual
– Protection
• Communication on the Local Area Network.
LAN Drive Communication Card (SLDCC)
SLDCC
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SLDCC
LAN Drive Communication Card (SLDCC)
GE Power Systems
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• Receives 3 of the major Feedback Signals:– DC Field Volts
– DC Field Current
– Excitation Secondary
• Receives attenuated signals from the SHVI board.
DC Feedback Board (DCFB)
DCFB
SLDCC
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DCFB
DC Feedback Board (DCFB)
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SCR High Voltage Interface (SHVI)
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• Provides attenuation of:– 3-phase Bridge Voltage
– DC Field Voltage
– DC Field Current
SCR High Voltage Interface (SHVI)
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SHVI Board
DC1PLPositive mV signal
from DC shunt
DC2PLNegative mV signal
from DC shunt
VCOAnalog to Digital
Converters
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SHVI BoardL1, L2, L3
AC Bridge Feedback (Phases A,B, and C)
P1, P2DC Bridge Feedback
(P1 is Positive, P2 Negative).
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• Processes analog signals and converts them to digital signals.
• Transducer algorithms are used to calculate system information.
• EX2000 simulator software is located here.
Microprocessor Application Card (TCCB)
DCFB
SLDCC
TCCB
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Microprocessor Application Card (TCCB)
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• Provides the interface between the SCR’s and the Control Core (via the DCFB Board).
Power Connect Card (PCCA)
DCFB
SLDCC
TCCB
PCCA
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Power Connect Card (PCCA)
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PTCT Board • Isolates and scales the Terminal
Voltage and Current feedback signals from the generator PT’s and CT’s.
• Isolated the Control Core from the PT’s and CT’s. Ea. Core has 1 PTCT board.
• Isolation switches (PTSW and CTSW) are provided for testing and maintenance.
• The LCI inputs the EX2000 reference signal on this board
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PTCT Board
• The output of the PTCT Board is sent to the TCCB Board.
• The TCCB Board will process and convert the signals from analog to digital and use them to calculate generator volts, current, MW’s, MVARS, etc.
• If the PTCT Board fails, the exciter auto regulator would not work because the generator terminal volts feedback signal is lost.
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Relay Terminal Boards (RTB)
• These boards contain relays which can be software driven via the LTB pilot relays or externally driven
• One application is to initiate a trip of the Generator Lockout Relay
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LAN Terminal Board (LTB)
• This terminal board provides:– 8 Contact Inputs– 14 Contact Outputs
• Configurable for specific jobs.
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• These boards contain:– RS-232 computer
communication port to allow communication between that particular core and a computer.
– Configuring hardware jumpers on the board can customize the relays.
NTB/3TB Terminal Board
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ACRNet Communication Board (ACNA)
• These devices have two coaxial cable connections that allow the exciter and protection cores to connect and also connect the OC 2000.
• Communication within the EX2000 and UC/0C2000 is ARCNET or a Token ring network
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Mark V
• Provides the reference or “setpoint” parameters to the EX2000
• MK V communicates through the UC2000 to the EX2000.
• MKV communicates on the LAN via a coaxial (ARCNET) cable
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OC 2000• Operator Control 2000 - Sequencing - Operator Interface
• Digital Meters• Push-Buttons• Status Lights• Diagnostic Displays
- Hard I / O• Contact I / O• Analog I / O
• Mark V Interface
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UC/OC 2000
UC 2000
OC 2000
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Protection Core
• Almost exactly the same computer as what is in the Primary and Backup Cores.
• Receives the same setpoint and feedback signals as Primary and Backup.
• Does not fire SCR’s.
• Responsible for the “Transfer Function”.
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• Provides a current path path to collapse the generator field when MDA/B open.
• During an abrupt trip, MDA are opened immediately and an SCR associated with the module is fired to provide at path for current flow through a discharge inductor and dissipates the stored energy of the field.
De-Excitation Module
*De-excitation Module shown is configured for EX2100.
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• If the De-Excitation circuit is active and the exciter has not been issued a STOP command, a fault (FLT.715) occurs. If the generator is On-Line, the fault will issue a trip request.
De-Excitation Module
*De-excitation Module shown is configured for EX2100.
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De-Excitation Module
DC Shunt
M DB
M DA
Fie
ld
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• Protects the generator journal bearings.
• Limits shaft to ground voltages to less than 7 vdc.
• If the voltages are high enough, the voltage can cause an arc from the shaft through the oil and into the journal bearing babbit.
• The SVS is a low pass filter that conducts the high frequency components of the induced voltages to ground.
Shaft Voltage Suppressor (SVS)
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Shaft Voltage Suppressor (SVS)
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• Detects a single field ground. and will either
• Creates an Alarm or Trip:– > 5000 ohms -No Alarm, No
Trip
– > 2000 ohms but < 5000 ohms - Alarm
– < 2000 ohms - Trip
Field Ground Detector
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Field Ground Detector
m ax (+)
(-)
A B C
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