Ex2 k hardware tab 3

GE Power Systems

Revision Date: 02/10/2000Revision Date: 02/10/2000 Property of Power Systems University- Proprietary Information for Training Purposes Only!Property of Power Systems University- Proprietary Information for Training Purposes Only!

EX2000 Hardware Details

GE Power Systems

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.

GE Power Systems

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.

GE Power Systems

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.

GE Power Systems

EX2000 Hardware

• The EX2000 Cabinet Hardware consists of:– Manual AC

Disconnect

– DC Disconnect

– DC Shunt

– Control Power Supply

– Power Conversion Section

GE Power Systems

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.

GE Power Systems

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

• 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)

GE Power Systems

• 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

GE Power Systems

Power Conversion Module

GE Power Systems

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.

GE Power Systems

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.

GE Power Systems

DC Current Shunt

GE Power Systems

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

GE Power Systems

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.

GE Power Systems

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

GE Power Systems

• 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)

GE Power Systems

LAN Drive Communication Card (SLDCC)

GE Power Systems

• 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)

GE Power Systems

DC Feedback Board (DCFB)

GE Power Systems

SCR High Voltage Interface (SHVI)

GE Power Systems

• Provides attenuation of:– 3-phase Bridge Voltage

– DC Field Voltage

– DC Field Current

SCR High Voltage Interface (SHVI)

GE Power Systems

SHVI Board

DC1PLPositive mV signal

from DC shunt

DC2PLNegative mV signal

from DC shunt

VCOAnalog to Digital

Converters

GE Power Systems

SHVI BoardL1, L2, L3

AC Bridge Feedback (Phases A,B, and C)

P1, P2DC Bridge Feedback

(P1 is Positive, P2 Negative).

GE Power Systems

• 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)

GE Power Systems

Microprocessor Application Card (TCCB)

GE Power Systems

• Provides the interface between the SCR’s and the Control Core (via the DCFB Board).

Power Connect Card (PCCA)

GE Power Systems

Power Connect Card (PCCA)

GE Power Systems

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

GE Power Systems

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.

GE Power Systems

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

GE Power Systems

GE Power Systemsg

Revision Date: 02/10/2000Revision Date: 02/10/2000 Property of Power Systems UniversityProperty of Power Systems University-- Proprietary Information for Training Purposes Only!Proprietary Information for Training Purposes Only!

GE Power Systems

LAN Terminal Board (LTB)

• This terminal board provides:– 8 Contact Inputs– 14 Contact Outputs

• Configurable for specific jobs.

GE Power Systems

• 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

GE Power Systems

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

GE Power Systems

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

GE Power Systems

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

GE Power Systems

UC/OC 2000

UC 2000

OC 2000

GE Power Systems

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”.

GE Power Systems

• 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.

GE Power Systems

• 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 shown is configured for EX2100.

GE Power Systems

DC Shunt

GE Power Systems

• 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)

GE Power Systems

Shaft Voltage Suppressor (SVS)

GE Power Systems

• Detects a single field ground. and will either

• Creates an Alarm or Trip:– > 5000 ohms -No Alarm, No

– > 2000 ohms but < 5000 ohms - Alarm

– < 2000 ohms - Trip

Field Ground Detector

GE Power Systems

Field Ground Detector

m ax (+)

GE Power Systems

Ex2 k hardware tab 3

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