Attachment One
Addendum Two
RFP-GM-70458
Additional Modifications to RFP-GM-70458, Exhibit A,
COLORADO SPRINGS UTILITIES PURCHASE SPECIFICATION
FOR
115/13.2kV, 20 MVA THREE PHASE MOBILE SUBSTATION
The following additional modifications are made to the above specifications:
1) Change 5.9.30 From:
“The LTC compartment shall be equipped with a thermowell as shown in Figure 4 of
ANSI/IEEE C57.12.00-2000. A 100-Ohm platinum RTD shall be provided as an
input for the Advanced Power Technologies TTC-1000 Transformer Temperature
Monitor (here after TTC-1000) described in section 5.10.5. The Monitor shall be
used to measure and provide alarms for LTC/Main Tank temperature differential.”
To:
“The LTC compartment shall be equipped with a thermowell as shown in Figure 4 of
ANSI/IEEE C57.12.00-2000. A 1000 Ohm BALCO RTD shall be provided as an
input for the Advanced Power Technologies TTC-1000 Transformer Temperature
Monitor (here after TTC-1000) described in section 5.10.5. The Monitor shall be
used to measure and provide alarms for LTC/Main Tank temperature differential.”
2) Change Paragraph 5.10.4 From:
“The transformer shall be equipped with two (2) top oil temperature thermowells, and
one bottom oil temperature thermowell as shown in Figure 4 of ANSI/IEEE
C57.12.00-2000. One of the top oil thermowells and the bottom oil thermowell shall
be capped, as spares. The remaining top oil shall be equipped with a 100 Ohm
platinum RTD. An ambient temperature sensor shall be provided, equipped with a
100 Ohm platinum RTD. This sensor shall be located in an area that is not subject to
direct sunlight, radiated transformer heat, or electrical heat. Hot spot CT's shall be
provided on all three phases of the XV bushings as noted in the CT requirements.
The above temperatures and currents shall be provided as inputs to the TTC-1000
Transformer Temperature Monitor as described in section 5.10.5. The
MANUFACTURER shall be expected to work with UTILITIES and Advanced
Power Technologies to properly apply and set up this monitor. The application and
component list must be approved by the UTILITIES’ MAINTENANCE
ENGINEER.”
To:
“The transformer shall be equipped with two (2) top oil temperature thermowells, and
one bottom oil temperature thermowell as shown in Figure 4 of ANSI/IEEE
C57.12.00-2000. One of the top oil thermowells and the bottom oil thermowell shall
be capped, as spares. The remaining top oil shall be equipped with a 1000 Ohm
BALCO RTD. An ambient temperature sensor shall be provided, equipped with a
1000 Ohm BALCO RTD. This sensor shall be located in an area that is not subject to
direct sunlight, radiated transformer heat, or electrical heat. Hot spot CT's shall be
Attachment One
Addendum Two
RFP-GM-70458
provided on all three phases of the XV bushings as noted in the CT requirements.
The above temperatures and currents shall be provided as inputs to the TTC-1000
Transformer Temperature Monitor as described in section 5.10.5. The
MANUFACTURER shall be expected to work with UTILITIES and Advanced
Power Technologies to properly apply and set up this monitor. The application and
component list must be approved by the UTILITIES’ MAINTENANCE
ENGINEER.”
3) Change Paragraph 5.10.5.j From:
“The monitor shall include the following options:
Loss of Life Calculation
Seasonal Cooling Setback
Adaptive Ambient Control
Low Temperature Lockout
Auxiliary Current Setpoint Capability”
To:
“The monitor shall include the following:
Load Pickup Cooling for transformer pre-cooling
Dual Algorithm LTC Condition Monitoring
Sensorless Tap Position Monitoring
Periodic exercising of fan banks
Mini-RTU fir transformer data collection
Panel Mounting
Dnp3 Level 1
Three Probe w/Aux CT
6 From C Outputs with LTC Position Monitoring
12 Digital Inputs
8 Extra CT’s
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