FIGURE 3.2.3.2.1-1 MASTER CONTROL PANEL (MCP)

The controls and indicators of the MCP as illustrated in Figure 3.2.3.2.1-1 are: a. Synchroscope/ Synchcheck Relay (SC/25M)

This meter provides a digital representation of a synchroscope during manual synchronizing operations. There are 24 red LEDs arranged in a ring simulating the traditional 360° movement of an analog synchroscope. Only one LED is lit at a time indicating the phase difference between the incoming and running signals. The display will “rotate” clockwise or counter clockwise and fast or slow depending on the frequency difference between incoming and running signals. Once the incoming and running signals are synchronized, the ring LEDs will go out and the green triangular LEDs will be lit. The green triangular LEDs at 3 o’clock and at 9 o’clock indicate the status of the voltage. Red is out of allowed synchronizing range and green is in range.

b. Phase Rotation Test Lights (PRL)

Phase Rotation Lights are used for checking the load cables for proper phase rotation prior to placing a PU on a common power distribution bus.

c. TIE Overcurrent Relay (50/51T)

This microprocessor-based relay provides Phase Time Overcurrent (51P), Phase Short Circuit (50P), and Ground Fault Protection (50N, 51N). This relay is a draw-out design allowing easy replacement. Each relay has a LCD display and control keypad to allow the operator to program and monitor required parameters. The display, by default, scrolls through the phase currents, total current, and alarm log. The LCD display on each overcurrent relay provides a display of the current flow through each phase of the associated breaker. This overcurrent relay monitors the common sensing return of their phase sensing current transformers. This provides each breaker with ground fault protection. d. Tie Breaker OPEN (GREEN) Indicator Light (TOL)

This green indicator light indicates that its associated breaker is open. e. Tie Breaker CLOSED (RED) Indicator Light (TCL)

This red indicator light indicates that its associated breaker is closed. f. Bus Voltage/Frequency Meter (BVFM)

This meter provides a digital display of the system bus voltage during manual synchronizing operations. The upper display shows bus voltage while the lower display shows bus frequency. This meter uses 3 phase sensing and it may differ from the GSC + reading.

g. 50/ 60 Hertz Indicator Lights (50L/60L)

The 50/60HZ lights reflect the Frequency Selector Switch (FSS) position while there is no Unit Selection Indicators (USI) on. This is independent of the setup required to configure the GSC + and Digital Voltage Regulator (AVR). Once the Unit Selector Indicators (USI) light is on, the FSS has no effect on the 50/60Hz lights. The 50/ 60 Hertz Indicator Lights (50L/60L) is set whenever the Master Start Enable Switch (MSES) is cycled to set the USI lights.

h. DC Control Power Breaker (CBCP)

The DC Control Power Breaker is a push-pull breaker. The breaker supplies 24VDC control power to the PDC. To open the breaker, pull out on the round knob. To close the breaker, push in on the round knob.

i. Generator Mode Switch (GMS)

This switch is a two-position, maintained, switch. This switch is used to determine the generator load sharing method of operation.

j. Automatic Voltage Regulator Switch (AVRS)

This switch is a two-position, maintained, switch. This switch is used to determine which method of voltage control the automatic voltage regulator is in.

k. TIE Breaker Switch (BCST)

This switch is for the control of the Tie Breaker. This switch has two momentary positions and one maintained position. There is also a target to indicate the last mechanical operation performed by the switch. This switch is used for local operation of the breaker, setting up the breaker for automatic operation, and disabling breaker operation.

l. Master Start Enable Switch (MSES)

This switch is a spring-loaded, momentary, toggle switch. This multi function switch performs various functions, depending on the system configuration. Toggling the switch in either direction accomplishes the same function.

m. System Status Light (SSL)

This green LED is illuminated when its associated generator is ready for automatic operation and the System Mode Switch is in the Auto position. This device is actually four individual LED indicators, integrated into a single cluster housing. The individually colored LED’s are arranged Red, Green, Amber, and Green starting with the upper LED.

n. Buzzer Silence Pushbutton (BSPB)

This pushbutton silences the PU buzzer after a fault occurs. The pushbutton must be pressed for each individual alarm. Pressing and holding-in will not silence multiple alarms/faults. Silencing the PU buzzer also silences the Operator Remote Terminal (ORT) buzzer, but does not acknowledge the ORT critical alarms.

o. Battle Short Switch (BSS)

This switch is a two-position, maintained, toggle switch. This switch has a flip cover that will return the BSS to NORMAL when it is closed.

p. System Synchronizing Switch (SSS)

This switch is a four-position, maintained, switch. This switch is used to determine which generator will manually synchronize to the system bus.

q. Panel Light Switch (PLS)

This switch is used to turn on the panel lights on the panel, used for night time operations. r. System Mode Switch (SMS)

This switch is a three-position, maintained, switch. This switch is used to determine the PU mode of operation.

s. Unit Selector Switch (USS)

This switch is a four-position, maintained, switch. This switch is used in conjunction with the Master Start Enable Switch (MSES) to select the identifier for multiple Power Units (PU)s and automatic operation.

t. Unit Selector Indicators (USI)

These four white indicators reflect each PU designation for power plant operation. The indicators are all off whenever the unit’s network ID has not been set. Depending on the position of the Unit Selector Switch (USS) when the Master System Enable Switch (MSES) is cycled, the associated LED will energize. These indicators provide positive indication that the control system has set the current setup parameters and the unit is starting operation.

NOTE: In the MANUAL mode the indicators only reflect that the unit’s ID has been set; in AUTO mode, the control system will also proceed with a normal startup. Whenever the System Mode Switch (SMS) has been in the OFF position for 3 or more seconds the unit ID is cleared and the indicator is de-energized until the SMS is placed in MANUAL or AUTO and the MSES is cycled.

u. G1 and G2 Overload Indicators (OLG1/G2)

These two red indicators reflect the status of Generator 1 and/or Generator 2 Overload condition. This is an alarm condition and the affected generator breaker will open immediately, after 2 minutes, or after 8 minutes depending on the severity of generator overload. The affected generator breaker will lockout and the generator will go into cool down mode until the condition is cleared.

3.2.3.2.2 DETAILED DISCUSSION OF CONTROLS AND INDICATORS

3.2.3.2.2.1 SYNCHROSCOPE/SYNCHCHECK RELAY (SC/25M)

Figure 3.2.3.2.2.1-1 illustrates the Synchroscope/ Synchcheck relay. This meter is located on Master Control Panel.

FIGURE 3.2.3.2.2.1-1 SYNCHRONIZING SCOPE METER (SC/25M)

This meter provides a digital representation of a synchroscope during manual synchronizing operations. There are 24 red LEDs arranged in a ring simulating the traditional 360° movement of an analog synchroscope. Only one LED is lit at a time indicating the phase difference between the incoming and running signals. The display will “rotate” clockwise or counter clockwise and fast or slow depending on the frequency difference between incoming and running signals. Once the incoming and running signals are synchronized, the ring LEDs will go out and the green triangular LEDs will be lit. The green triangular LEDs at 3 o’clock and at 9 o’clock indicate the status of the voltage. Red is out of allowed synchronizing range and green is in range.