Table of Contents
Advertisement
Chapter 4
CGCM-DLR Unit Configuration
94
• Loss of Excitation Current setpoint - Establishes the level of excitation
current that is considered to be a minimum that is required to maintain
generator synchronization when in parallel with other power sources such
as a utility grid. This setpoint is stored in tag LossExc_I_Setpt in the
configuration table and scaled in amperes. Excitation current in excess of
the loss of excitation current setpoint enables loss of sensing protection.
• Loss of Excitation Current Delay - Establishes the amount of time in
seconds that the excitation current must be continually below the Loss of
Excitation Current setpoint before the CGCM-DLR unit annunciates a
loss of excitation fault. This setpoint is stored in tag LossExc_I_TimeDly
in the configuration table
• Rotating Diode Fault Main Pole - Indicates the number of poles of the
main field of the generator. Stored in tag MainPole in the configuration
table.
• Rotating Diode Fault Exciter Pole – Indicates the number of poles of the
exciter field of the generator. Stored in tag ExciterPole in the
configuration table.
• Rotating Diode Fault Open Diode Level - Establishes the percent ripple at
which the rotating diode monitor alarm turns on when an open diode
condition occurs. This parameter is stored in tag
OpenDiodeMonitorLevel in the configuration table and is expressed in
percent of maximum ripple current.
• Rotating Diode Fault Shorted Diode Level - Establishes the percent ripple
at which the rotating diode monitor alarm turns on in the event a shorted
diode condition occurs. Tag ShortedDiodeMonitorLevel in the
configuration table stores this value, expressed in percent of maximum
ripple current.
• Rotating Diode Fault Delay - Establishes the time duration that the ripple
current must be at or above the fault level before the CGCM-DLR unit
annunciates a rotating diode fault. Tag DiodeMonitorTimeDelay in the
configuration table stores this value, expressed in seconds.
TIP
• Excitation Select – Selects the excitation power source. This parameter is
stored in the Boolean tag PMG_Shunt_Select in the Configuration table.
In this tag, 0 = PMG, 1 = Shunt. Select PMG to enable the loss of PMG
sensing. Select Shunt to obtain excitation power from the generator
terminals and for systems using series boost.
• PMG Phase Select – Establishes whether the excitation power source to
the CGCM-DLR unit is single or 3-phase, to assure correct operation of
the loss of PMG sensing function. This parameter is stored in the Boolean
tag PMG_1Ph_3Ph_Select in the Configuration table. In this tag, 0 =
single phase, 1 = 3-phase.
Related Parameters:
• Over-excitation voltage protection – Over-excitation limiting (OEL)
configuration parameters
• GenRated_V
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
See
Chapter 5
for more information on the configuration of
rotating diode protection parameters.
Advertisement
Table of Contents
