Bid Package 08 North Well Field - Garney Construction

Colorado River Municipal Water District
Raw Water Supply Well Sites
Ward County North Well Field
C. STUDY REPORT: Results of the load flow study shall be summarized in a final report
containing the following items:
1. Basis, description, purpose, and scope of the study.
2. Tabulation of data used to model the system components and a corresponding
one-line diagram.
3. Description of scenarios evaluated and the basis of each.
4. Tabulation of power and current flow versus equipment ratings. The tabulation
shall identify percentage of rated load and the scenario for which the percentage
is based. Overloaded equipment shall be clearly noted.
5. Tabulation of system voltage versus equipment ratings. The tabulation shall
identify percentage of rated voltage and the scenario for which the percentage is
based. Voltage levels outside the ranges recommended by equipment
manufacturers, IEEE C84.1 or other appropriate standards shall be clearly noted.
6. Tabulation of system real and reactive power losses with area of concern clearly
noted.
7. Provide One-line showing voltage at major busses.
8. Conclusions and recommendations.
2.7 MOTOR STARTING STUDY
A. The motor starting study shall provide an evaluation of the electrical power system when
starting the motors for all operating scenarios. The motor starting study shall evaluate all
different possible operating scenarios under the worst case starting conditions. The
CONTRACTOR shall coordinate with the electrical equipment manufacturers and obtain
all information required to perform the motor starting analysis. The preliminary starting
analysis shall determine the maximum inrush allowed when starting the motors to not
drop out the site loads under the worst operating conditions.
B. Scope:
1. CONTRACTOR shall provide a motor starting/load flow study for the work
performed at the site. The study shall evaluate all possible operating scenarios.
See electrical plans for detailed one-line diagram of the electrical distribution
system. The CONTRACTOR shall coordinate with the Local Utility and
OWNER for all voltage flicker requirements and is responsible for obtaining all
pertinent data from the Local Utility/OWNER and other equipment
manufacturers to perform the study.
2. CONTRACTOR shall obtain any information required for the motor starting/load
flow study including utility available fault current, utility system impedance,
motor data (i.e., sub transient reactance, etc.), transformer data (i.e. impedance,
X/R, etc.), cable data, etc.
3. The study shall be submitted to the ENGINEER and approved prior to final
approval of the electrical equipment shop drawings and release of any electrical
equipment for manufacturing.
4. The study shall include as a minimum the following:
a. Single line diagram showing voltage at all major busses.
b. Bus Voltage and power flow
c. Information on the computer program used for the study and also shall
include a general discussion of the procedure, items, and data considered
in preparing the study.
d. Description and analysis of all results.
May 18, 2012
Electrical Power System Studies
Revision 0 26 05 73.01-9