Control Panel

This equipment is located in the power plant control It consists of a

mimic diagram, voltemeter, ammeter, annunciator, etc. Where local

operation of breaker and remote operation of the disconnect switch are

initiated. Earthing switch position indicator is also located in this panel

in order to monitor its actual position in the field

Control Panel (Cont.)

a. Mimic Diagram

b. Designation Labels

Control Panel Components and Functions

c. Remote/Local Knobs

d. Control/Discrepancy Switch (PCB/DS)

e. Earthing Switch Position Indicator

f. Alarm annunciator

g. Analog/Digital Meters and Phase Selector Knobs

h. Panel Lamp Test Button

Control Panel (Cont.)

a. Mimic Diagram

This serves s a single line diagram of a particular switchyard which is being

superimposed on the control panel. It shows the associated equipment,

bays of the switchyard. Along the single lines are the specific control

switches for particular high voltage equipment in the field.

Control Panel (Cont.)

b. Designation Labels

Numerical

designation

labels are being

provided for

specific control

switches that

correspond the

designation of

PCB, Tie

Isolator&

Ground Isolator

PCB

Ground Isolator

Tie Isolator

Control Panel (Cont.)c. Syhn Knob

This is a key-operated selector

switch knob associated with the

PCB and Tie Isolator control

switch. When set in the “On”

mode, opening and closing of

PCB and Isolator can be done on

the control panel by means of

specific control switch. But when

set on the “Off” mode, operation

of PCB and Tie Isolator is not

possible

Control Panel (Cont.)d. Control/Discrepancy Switch (PCB/Tie Isolator/Ground Isolator)

Used for closing and

opening operation of

the PCB and Tie

Isolator. It indicates

the relative position of

the control switch and

the high voltage

equipment being

controlled. A flashing

signal means that the

status of the control

switch and the

particular equipment

in the field are not the

same.

PCB

Ground Isolator

Isolator

Control Panel (Cont.)e. Earthing Switch Position Indicator

Ground Isolator can only be

operated manually in the

field. The stripe of the

indicator button on the

control panel must be on-line

with the mimic diagram when

the ES is closed (engaged)

and across when the ES is

open (disengaged)

Ground Isolator is

closed

Control Panel (Cont.)f. Alarm Annunciator

Shows the switchyard common

alarms. Occurrence of a particular

alarm is indicated by a flashing red

LED on a labeled pen in which case

the audible alarm will also sound or

ring. Ringing can be stopped by

pressing the “Silence” button.

Pressing the “Acknowledge” button,

the red LED lights permanently until

the equipment causing the particular

alarm is reset. Flashing of red LED

can be observed again and will be off

by depressing the “reset” button. This

means that the alarm has been

eliminated. Lamp test is done by

pressing the SACO “test” button for

about 2 to 3 seconds.

Control Panel (Cont.)

g. Analog/Digital Meters and Phase Selector Knobs

Meters show the

instantaneous readings of

the system parameters on

a particular bay, such as,

frequency (Hz), line

currents (amp), voltage

(kV), power (MW) and

reactive power (MVAR).

Phase selector knobs are

used to read the

instantaneous line-line

currents and phase

voltages.

Control Panel (Cont.)h. Panel Lamp Test Button

By pressing this button, built-in lamps

of all the synchronizing buttons and

control discrepancy switches of the

power circuit breaker and Tie

Isolators will illuminate indicating

their functionality.

end