HomeMy WebLinkAboutAgenda Report - August 7, 1996 (74)CITY OF LODI COUNCIL COMMUNICATION
AGENDA TITLE: Specifications and Advertisement for Bids for 12KV Padmounted Switchgear
MEETING DATE: August 7, 1996
SUBMITTED BY: Electric Utility Director
RECOMMENDED ACTION: That the City Council approve the specifications and authorize advertisement
for bids for the purchase of seven (7) 12KV padmounted switchgear units.
BACKGROUND: The Electric Utility Department's Engineering Division has requested that
seven (7) 12KV padmounted switchgear units be purchased to provide electric
energy to new housing developments such as Towne Ranch and Century
Meadows, and provide inventory back-up for emergency replacements due to
failure and for replacement of existing units which are no longer repairable.
This switchgear is utilized throughout the City's underground distribution system to provide load transfer
capabilities, system protection and failure isolation.
FUNDING: The estimated cost of this purchase is $84,000. Funding is available in the Electric Utility
Department's Operating Fund.
BID OPENING: August 28, 1996
Prepared by Mel Grandi, Electrical Engineer
ANV/MG/sh
cc: Purchasing Officer
Assistant Electric Utility Director
APPROVED
c r
H. Dixon Flynn
CT' MANAGER
Alan N. Vallow
Electric Utility Director
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CITY OF LODI - ELECTRIC UTILITY DEPARTMENT
EQUIPMENT SPECIFICATIONS
PADMOUNT SWITCHGEAR AIR OR OIL INSULATED
A. GENERAL:
This specificatin covers the electrical and mechanical features of padmounted switchgear
to be used in the City of Lodi's 12,000 volt primary distribution system. This document
shall be limited to 15KV class, 200A and 600A, three phase, dead front, fused and
unfused, air or liquid insulated padmount switchgear.
It is the intent of these specifications to describe equipment of the best design and
construction for the service for which it is intended. Consequently, it shall be the City's
desire to award contracts to the bidder who has demonstrated high quality by having a
considerable number of switches of the manufacturer in service on lines of electric
utilities over a period of years.
B. TESTS:
The switchgear shall pass design test and production test per latest revisions of
applicable American National Standards Institute (ANSI) standards.
In addition all switchgear must pass the following production tests:
1. Continuity test to verify all internal connections.
2. Hi -Pot Test to determine dielectric strength of unit.
Liquid insulated units:
3. Pressure Test Tank
4. Oil shall be tested for dielectric strength and contamination after the
production tests. The dielectric strength tested per ASTM -D-877 shall be
greater than 35KV. The visual condition tested per ASTM -13-1542 shall be
clear with no sediment. The insulating oil shall be certified to contain no
Polychlorinated Biphenyls (PCB's).
C_ GUARANTEE:
The manufacturer shall guarantee all equipment delivered under these specifications
against any and all defects in material and/or workmanship for a period of at least one
year from date of acceptance. The manufacturer shall rectify all such defects by repair or
replacement at his own expense and assume responsibility for associated shipping costs.
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EQUIPMENT SPECIFICATIONS
(continued)
D. RATINGS & DESIGN:
The following shall be met:
1. Electrical Ratings:
Nominal Voltage:
Minimum Insulation Level:
Continuous Current:
14.4KV phase to phase
8.3KV phase to grid.
95KV BIL
600AMP Switch sections
600AMP Isolation Switch
200AMP Fuse section (s)
Minimum Load Switching: 600A
Minimum Short Circuit Current: 12000A RMS, Sym.
19000A RMS, Asym.
2. Design:
Dead front, three phase, air or liquid insulated equipped
with windows to visually verify switch or disconnect contact
position.
The switchgear configuration shall be as specified on the
proposal form (s).
3. Bushings:
All 600A rated sections shall be equipped with 600A dead
front bushings.
All 200A sections shall be equipped with universal bushing
wells.
4. Fusing:
The fused taps shall be equipped with power fuses.
Complete fuse assemblies including fuse links, as specified
on the proposal form (s), shall be provided.
5. Visible disconnects and Viewinq Windows:
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Air insulated main feeder switches do not require a
disconnect (isolation) switch. Each main feeder switch
shall have a viewing window to visually inspect the switch
contacts and to establish a visible open.
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EQUIPMENT SPECIFICATIONS
(continued)
D. RATES & DESIGN:(cont.)
6. Enclosure:
6a. Nameplate;
Liauid (oil) insulated vacuum switches shall be supplied
with a 3 phase gang operated isolation switch and viewing
window. The isolation switch shall be in series with the
vacuum contacts and be group (gang) operated. The
isolation switches shall have a viewing window to visually
inspect the switch contacts and to establish a visible open
The enclosure integrity shall meet requirements of the
latest ANSI standards and Western Underground Guide (s).
One loadbreak type parking stand shall be provided for
each termination. The parking stands are to be located
adjacent to each termination.
The switchgear shall be equipped with a minimum of 3/8"
diameter round copper ground bus (one in each
compartment) for grounding. The ground bus shall be
located in a minimum 9" and not more than 12" from the
bottom of the switch and extend full width of the
compartment.
All switches to be group (gang) operated
All switch handles shall be located within the front/rear
cable terminating compartment and shall be operatable with
a safety eight foot insulating switch stick.
Side mounted switch operating handles will not be
accepted.
Operating handles shall clearly labeled.
The isolation switch shall be interlocked with the vacuum
switch such that the isolation switch can not be opened
until the vacuum switch is opened.
The switchgear shall be equipped with stainless steel or
anodized aluminum nameplate (s). The nameplate (s) to
be located on the switch wall one in each compartment.
The nameplate (s) shall have the following information stamped or
engraved:
Name of manufacturer
Date of manufacturer
• Serial number
Model or style number
• Rated voltage
" Rated impulse withstand voltage (BIL)
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D. RATES & DESIGN (cont.):
EQUIPMENT SPECIFICATIONS
(continued)
* Rated continuous current
* Rated load interrupting current
* Rated short current (Sym. and Asym.)
* Total weight
" Schematic diagram
* PCB Content in PPM
Note: The schematic diagram may be a separate plate located adjacent to
the nameplate and made of the same material as the nameplate.
The nameplate and schematic diagram to be securely attached to
the switch.
6b. Dimensions: Over all dimensions shall not exceed the following:
80" WIDTH X 70" DEPTH X 50" HEIGHT
6c. Locking Provisions:
6d. Paint:
Cabinets:
Each cabinet shall have three point latching, a locking
provision and one pentahead bolt. The bolt shall be
coordinated with the latch and padlock to prevent
unlatching and insertion of the padlock into the hasp when
and until the bolthead is completely seated.
Hoods:
Two locking provisions shall be provided with each hood.
Each locking provision shall consist of a pentahead bolt and
shall be coordinated with the padlock to prevent insertion of
the padlock into the hasp when and until the bolthead is
completely seated.
All exterior surfaces shall be painted Munsell 7GY3.2911.5
(olive) green or approved equal, using a system of
coordinated and thoroughly tested materials and application
techniques that will assure long life. Special attention shall
be given to welds, seams, edges and rough spots.
6e. Lifting Provisions:
Lifting provisions shall be provided and located in such a
way to avoid interference between lifting slings and any
attachments on the switchgear and to avoid scratching the
finish.
6f. Compartment Depth:
A minimum clearance of 20" shall be maintained between
the door and the 600A bushing mounting surface to
accommodate a 200A elbow piggyback connected to a
600A T -connector.
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EQUIPMENT SPECIFICATIONS
(continued)
D. RATES & DESIGN (cont.):
6f. Compartment Depth:
A minimum clearance of 20" shall be maintained between
the door and the 600A bushing mounting surface to
accommodate a 200A elbow piggyback connected to a
600A T -connector.
A minimum clearance of 18" shall be maintained between
the door and the 200AMP bushing well mounting surface.
6g. Fuse Replacement:
A suitable interlock shall be provided which prevents
removing the fuse prior to parking the respective 200A
elbow.
E. ADDITIONAL FEATURES
The following items shall be provided with the switchgear:
Oil Insulated
A. Oil fill and drain plug with gate valve to isolate fill/drain plug
from tank.
B. Sight gauge for oil level indication.
C. Hotstick operable automatic pressure relief valves for both
main and tap side of switchgear.
D. Oil drip tray for each fuse.
Oil & Air Insulated
A. Maintenance and installation instruction manuals 2 sets to
be provided with each switch. The manual shall be divided
and tabbed as follows:
-maintenance
-installation
-factory tests
B. Each busing, fuse and switch position shall be labeled.
C. Factory test results to be included in each of the 2 sets of
the maintenance and installation manuals.
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