HomeMy WebLinkAboutAgenda Report - December 20, 1989 (60)TO: THE CITY COUNCIL WtT4CL NffEE VG DATE NO.
FROM: THE CITY MANAGER'S OFFICE DECEMBER 20, 1989
SUBJECT: SPECIFICATIONS AND ADVERTISEMENT FOR THE PURCHASE OF EIGHT 1200 KVAR
CAPACROR BANKS
RECOMMENDED ACTION: That the City Council approve the specifications
and authorize advertisement for bids for the purchase of eight 1200KVAR
Capacitor Banks.
BACKGROUND P4(FMAIION: The capacitor banks are planned for
installation at various locations throughout the city to increase
electrical system capacity and to maintain high service levels during
periods of peak demand.
The estimated cost of this purchase is $35,000, with delivery expected
about 10 weeks after placement of order. Funding is available in the
Electric Utility Department's Operating Fund.
The bid opening is set for Monday, January 8, 1990.
- It 440 -L
Joe�/E. Harris
Pu hasing Officer
cc: Electric Utility Oirector
Assistant Electric Utility Director
Electrical Engineer
EQUIPMENT SPECIFICATIONS
12 - K V CAPACITORS
A. GENERAL
Capacitor banks shall be rated 1200 KVAR and be utilized on a 12.0-kv
(nomina?) system. The banks shall consist of six (6) individual, two (2)
bushing, 7.2-kv, 200 KVAR single-phase capacitors connected in a floating
(ungrounded) Wye.
B. REQUIRE1VIE TS FOR CAPACITOR UNITS
1. Capacitor units shall bE manufactured and tested in accordance with ANSI
Standard C55.1 (latest revision) and ANSI Standard C55.2 (latest
revision).
2. Ratings - Each individual capacitor shall be rated as follows:
200 KVAR (nominal)
7200 volts
95-kv Bil (minimum)
3. Construction - Each individual capacitor shall be constructed as follows:
Paint Color: ANSI 70 Gray
°
Capable of mounting with NEMA standard 15.62" centers.
°
Bushing creepage shall be 10" (minimum).
Each bushing shall include an insulating terminal cover.
°
Capacitors shall contain NO PCB's.
• All film foil construction
• Two (2) bushings
4. Capaditor losses shall not exceed 0.2 watts/KVAR. This value is based
upon being energized at rated voltage in a 40° C ambient temperature.
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5. The internal corona starting voltage or ionization level shall not be less
than 1130% of rated voltage at 25" C.
6. Each capacitor design shall have successfully passed the design test
described in ANSI C55.1 (latest revision).
7. All units shall successfully pass a test where d.c. voltage at 4.3 times
the capacitor -rated voltage is applied for 10 seconds minimum.
C. GENERAL REQUMMENTS FOR ASSEMBLIES
1. Equipment shall be preassembled and wired ready for raising into place and
bolting to the pole.
2. Equipment shall be capable of being installed in conformance with
California G.O. 95 as received from the vendor.
3. Cantilever strength of the rack shall provide a safety factor of five (5).
4. Rack material shall be steel conforming to ASTM A36 (latest revision) with
hot -dipped galvanized finish per ASTM A153 (latest revision).
5. Bushing air clearances between individual units shall be six (6) iriches
minimum, phase -to -phase and phase - to- ground.
6. Banks shall be wired in a floating (ungrounded) Wye and have a bare
loop approximately three (3) inches long at each end of the neutral bus to
permit attachment of grounds when required.
7. Bus wiring shall have 5-kv minimum insulation.
D. SPECIAL REQUIREMENTS FOR SWITCM ASSEMBLIES
1. Switches shall be rated for capacitor switching up to 1200 KVAR banks
(400 KVAR per switch). Switches shall have terminal covers.
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2. Oil switches must be electrically and mechanically interchangeable and
supplied with 5 -conductor plug and receptacle. Control wiring to be
factory assembled with switch controls wired and terminated cn a terminal
board located in a weatherproof, frame -mounted junction box. Acceptable
oil switches are:
Westinghouse CSR
General Electric 9F90DBF.142
3. Capacitor switches shall be insulated from the rack by means of stand-off
insulators. Miinu f creepage of capacitor switch i ns,.;l ators shall be ten
(10) inches.
4. Means for grounding the switch tanks only shall be provided.
5. Grounding connector for switch tank shall be of a material compatible with
switch tank finish.
6. Ground lead shall consist of 600 -volt insulated copper, minimum of No. 6
AWG and shall be insulated from the rack with Schedule 30 PVC conduit.
7. Switch leads shall have three (3) inches bare section on load side to
permit attachment of grounds when required.
E. QUOTATION AND DRAWING REQUIREMENTS
1. For evaluation purposes, edch bid shall be accompanied by the following
information for each capacitor unit:
a. Loss versus temperature.
b. Capacitance versus temperature.
c. Corona starting voltage versus temperature.
d. Maximum and average watts loss from actual production.
e. Safe time versus current plots or allowable i 2 t values.
f. Dielectric stress i n vol is/mi 1 .
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g. Nin>ber of series - parallel sections and the section voltage at rated
voltage operation.
h. Results of all required tests.
2. Complete de s c r i p'; i ve data with proposed drawings for all included equipment
shall accompany the proposal.
3. Approval drawings are required. Two (2) sets of final drawings and
instruction manuals shall be provided by the supplier.
4. Bidders shall submit information as to the chemical content of all fluids
used within the capacitor units offered in this proposal. Absolutely no
PCB's or any fluids containing any form of chlorinated benzines,
currently under investigation by the EPA, will be accepted.
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