Meter Option - GE 269Plus Instruction Manual

METER OPTION

The addition of a GE Power Management MPM meter to a 269Plus provides valuable voltage and power mea-
surement. These values are good for troubleshooting and protective features.
In order to install the MPM, all connections to the meter must be made. Then, the
and
R A T I O V T S E C O N D A R Y
the meter via the communication link for meter calculations.
*** IMPORTANT *** Only after the above steps are complete may the meter be brought on-line
by changing the
to . The 269Plus will then initiate communication with the meter and actual values from the
Y E S
NOTE
meter may be displayed.
3
A value for Megawatt Hours from 0 to 65535 may be displayed in the Statistical data of Actual Values page 4.
Voltage, KWatts, KVARS, Power Factor, and Frequency may be viewed in Actual Values page 7. These values
may also be seen as their pre-trip levels on Actual Values page 5.
The Undervoltage trip and alarm levels determine the threshold that voltage must fall below for an alarm or trip
condition to exist. The time delay set determines the amount of time that these conditions must persist before
an actual trip or alarm occurs.
The Power Factor Lag and Power Factor Lead trip and alarm levels determine the threshold that the power
factor must fall below for an alarm or trip condition to exist. The time delay set determines the amount of time
that these conditions must persist before an actual trip or alarm occurs. Power Factor is commonly used for
synchronous motor protection. Ideally, synchronous motors run at unity power factor. Conditions may exist
where the power factor drops below an acceptable level. This may be caused by several factors, such as the
loss of field to the main exciter, accidental tripping of the field breaker, short circuits in the field currents, poor
brush contact in the exciter, or loss of AC supply to the excitation system. Power Factor Lead and Power Fac-
tor Lag alarm and trip setpoints with programmable time delays can be used to detect such conditions as out of
step, loss of synchronism or loss of field.
Where the motor is started unloaded and the field applied later in the start, the power factor may be poor until
the motor is loaded and synchronous speed is attained. It may then be necessary to block power factor protec-
tion until the motor is up to speed.
A setpoint on page 7 allows the user to pick one of two methods of blocking power factor protection on start.
Answering to the setpoint
N O
Factor Protection Delay feature may be enabled. So, when programmed, after the motor has successfully com-
pleted a start, this setpoint requires that the measured power factor comes between the user specified
and
F A C T O R T R I P L E A D
Factor protection delay) before the power factor trip and alarm features become active. A stop condition resets
the algorithm.
Answering to
Y E S B L O C K P F P R O T E C T I O N O N S T A R T ?
T R I P O N S T A R T B Y : X X X S E C O N D S
factor lag and power factor lead alarm and trip protection from start until the time expires. When programming
this delay, consideration must be given to the time it takes the motor to start, apply the field and the load.
The positive kvar alarm and negative kvar alarm setpoint levels determine the threshold that kvars must
exceed for an alarm or trip condition to exist. The time delay set determines the amount of time that these con-
ditions must persist before an actual trip or alarm occurs.
3-
66
Courtesy of NationalSwitchgear.com
setpoints on Setpoints page 7 must be programmed. These setpoints will be sent to
M E T E R S E T P O I N T S S E T A N D M E T E R O N - L I N E
B L O C K P F P R O T E C T I O N O N S T A R T ?
setpoints for the specified period of time (user's value for Power
P O W E R F A C T O R T R I P L A G
may be enabled. When this delay is programmed, the 269Plus blocks power
269Plus Motor Management Relay
setpoint (see Setpoints page 7, line 2)
puts the 269Plus in a mode where the Power
puts the 269Plus in another mode where
3 SETUP AND USE
3.28 METER OPTION
,
M E T E R P H A S E C T P R I M A R Y
P O W E R
B L O C K P F A L A R M &
GE Power Management
V T