Table of Contents
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Chapter 4
CGCM-DLR Unit Configuration
92
• Bus VT Configuration - The bus VT configuration selections are (1)
single-phase, (2) two-transformer open delta, (3) three-wire Wye, (4)
four-wire Wye, and (5) dual breaker. This parameter is stored in the tag
BusVT_Config in the configuration table. For applications that require
synchronization to one of two busses, dual breaker must be selected.
• Bus A VT Primary Voltage - The primary voltage rating of the bus voltage
transformer is stored in tag BusA_VT_Pri_V in the configuration table.
• Bus A VT Secondary Voltage - The secondary voltage rating of the bus
voltage transformer that is connected to V Bus A, V Bus B, and V Bus C
(and V Gen N for Wye configurations) of the CGCM-DLR unit. This
parameter is stored in tag BusA_VT_Sec_V in the configuration table.
• Bus B VT Primary Voltage - The primary voltage rating of the second bus
voltage transformer when dual breaker bus VT configuration is selected.
This parameter is stored in tag BusB_VT_Pri_V in the configuration
table.
• Bus B VT Secondary Voltage - The secondary voltage rating of the second
bus voltage transformer that is connected to V Bus B, and V Bus N of the
CGCM-DLR unit. This parameter is stored in tag BusB_VT_Sec_V in
the configuration table.
The Bus B VT settings are used only by the CGCM-DLR unit if the Bus
VT configuration selection is dual breaker.
• Generator CT Primary Current - Is the primary current rating of the
generator current transformers. This parameter is stored in tag
GenCT_Pri_I in the configuration table.
• Generator CT Secondary Current - The secondary current rating of the
generator current transformers that are connected to the CGCM-DLR
unit terminals I1, I2, and I3. This parameter is stored in tag
GenCT_Sec_I in the configuration table.
• Cross Current CT Primary Current - The primary current rating of the
cross current generator current transformer. This parameter is stored in tag
CCCT_Pri_I in the configuration table. It is used to monitor generator
reactive current in paralleling applications.
• Cross Current CT Secondary Current - The secondary current rating of
the cross current generator current transformer that is connected to the
CGCM-DLR unit terminals ID (+) and ID (-).This parameter is stored in
tag CCCT_Sec_I in the configuration table. It is used to monitor
generator reactive current in paralleling applications.
As an example, consider a generator that is rated at 12,470V and 450 A.
EXAMPLE
VTs with ratios of 100:1 and CTs with ratios of 500:5 are used. The
appropriate settings for this configuration are:
•
•
•
•
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Generator VT Primary Voltage = 12,000
Generator VT Secondary Voltage = 120
Generator CT Primary Current = 500
Generator CT Secondary Current = 5
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