1992-168ALLOOO1F
AN ORDINANCE PROVIDING FOR THE EXPENDITURE OF FUNDS FOR EMERGENCY
PURCHASES OF MATERIALS, EQUIPMENT, SUPPLIES OR SERVICES IN ACCORD-
ANCE WITH THE PROVISIONS OF STATE LAW EXEMPTING SUCH PURCHASES FROM
REQUIREMENTS OF COMPETITIVE BIDS; AND PROVIDING FOR AN EFFECTIVE
DATE.
WHEREAS, state law and ordinance require that certain contracts
requiring an expenditure or payment by the City in an amount ex-
ceeding $10,000 be by competitive bids, except in the case of pub-
lic calamity where it becomes necessary to act at once to appro-
priate money to relieve the necessity of the citizens, or to pre-
serve the property of the city, or it is necessary to protect the
public health of the citizens of the city, or in case of unforeseen
damage to public property, machinery or equipment. The City Man-
ager has recommended to the city Council that it is necessary to
purchase goods or services due to such emergency conditions; NOW,
THEREFORE,
THE COUNCIL OF THE CITY OF DENTON HEREBY ORDAINS:
SECTION I. That the city Council hereby determines that there
is a public calamity that makes it necessary to act at once to ap-
propriate money to relieve the necessity of the citizens, or to
preserve the property of the city, or to protect the public health
of the citizens of the city, or to provide for unforseen damage to
public property, machinery or equipment, and by reason thereof, the
following emergency purchases of materials, equipment, supplies or
services, as described in the ,,Purchase Orders" attached hereto,
are hereby approved:
PURCHASE
ORDER NUMBER VENDOR AMOUNT
26844 SOUTHWEST ELECTRIC CO. $ 97,788.00
SECTION II. That because of such emergency, the City Manager
or designated employee is hereby authorized to purchase the mater-
ials, equipment, supplies or services as described in the attached
Purchase Orders and to make payment therefore in the amounts there-
in stated, such emergency purchases being in accordance with the
provisions of state law exempting such purchases by the city from
the requirements of competitive bids.
SECTION III. That this ordinance shall become effective im-
mediately upon its passage and approval.
ATTEST:
JENNIFER WALTERS, CITY SECRETARY
DEBRA A. DRAYOVITCH, CITY ATTORNEY
PAGE 2
DATE: OCTOBER 6, 1992
CITY COUNCIL REPORT
TO: Mayor and Members of the City Council
FROM: Lloyd V. Harrell, City Manager
SUBJECT: PURCHASE ORDER #26844 - SOUTHWEST ELECTRIC CO.
RECOMMENDATION: We recommend Purchase Order 26844 to Southwest Electric Co.
in the amount of $97,788.00 be approved.
SUMMARY: This purchase order is for the emergency repairs to the 69KV/113.2KV
power transformer at the Spencer Road Substation. The unit failed September 14,
1992. Telephone quotations were taken for cost to repair and Southwest Electric
offered the lowest quoted price. Their delivery schedule is 16-18 weeks after
receipt of the transformer. The repaired unit will have a full one year warranty.
BACKGROUND: Purchase Order 26844, Quote from Southwest Electric.
PROGRAMS ~ DEPARTMENTS OR GROUPS AFFECTED: Electric Substation Division.
FISCAL IMPACT: The major cost of these repairs will come from insurance
reimbursement less the deductible of approximately $20,000.00. The deductible
amount will be paid from funds budgeted for maintenance of the Electric System.
>pectfully submitted:
~,' Lloyd V. Harrel~'
City Manager
Approved:
Name: Tom D. Shaw, C.P.M.
Title: Purchasing Agent
299.agenda
Southwest Electric Co,
Post Office Box 8263--
Oklahoma Oty OMahom~, 73~,;;..
Motor Division
2617 South ag-'.~
Telephone (405/ 634 444
Transformer Division
September 15, 1992
Mr. Ray Wells
Superintendent
city of Denton Utilities
Municipal Building
Denton, TX 76201
Subject: Complete Redesign and Remanufacture of Federal Pacific
15/20/25/28 MVA, 69-13.8 kV, 350 kV BIL, LTC Transformer,
S/N 21841-1
Our Quotation Number 1623
Dear Mr. Wells:
In response to your verbal request, we are please to quote as
follows:
Complete Redesign and Remanufacture (per the attached Redesign
Policy) of the subject transformer using all copper conductor
and high density 65 degree C insulation materials where
applicable and including computer short circuit analysis.
Price: $ 97,788.00 Net.
Our current lead time is approximately 16 to 18 weeks after
approval of repairs to be made.
Price does not include transportation, oil or parts found to be
defective such as bushings, core steel or tank accessories.
Our policy on LTC units is that the preventive auto reactor will be
tested when received. It may or may not be rewound depending on
age, condition, test results and other design criteria. Our price
does not include the rewind of this component if that is required.
Mr. Ray Wells
City of Denton Utilities
Page 2
Warranty period will be one year from date of energization, not to
exceed 18 months from date of shipment, per the attached policy.
Price is firm for an order entered within 30 days.
Delivery will be F.O.B. our plant in Oklahoma city.
Terms of payment are net 30 days from date of shipment.
We thank you for this opportunity to submit to a quotation and look
forward to receiving your order. Let us know if you need any
additional information.
Very Truly Yours,
John E. Lee
Customer Service Engineer
Power Transformer Division
1-800-364-5691
GF/kn
Enclosures:
Redesign Policy
Warranty Policy
PCB Statement
Southwest Electric Co.
Post Office Box 82639
Oklahoma City, Oklahoma 73148
Motor Division
2617 South Agnew
Telephone (405) 634.4445
Transformer Division
6501 Southeast 74th Street
Telephone (405) 737 5691
PCB STATEMENT
We will require a copy of a current PCB analysis on all
transformers, bushings and other oil-fl!led apparatus prior
to receiving the equipment in our shop.
Transformers and Other Oil-Filled
Apparatus (Except Bushings)
Equipment testing 49 ppm PCB or tess wl!l be accepted with or
without oil. Equipment testing 50-499 ppm PCB will be ac-
cepted only if the equipment has been completely drained.
Southwest Electric will not accept equipment in this category
testing greater than 499 ppm PCB.
Oil-Filled Bushings
Bushings testing 499 ppm PCB or less w~ll be accepted with
oil. Southwest Electric will not accept bushings testing
greater than 499 ppm PCB.
August 5, 1991
Southwest Electric Co.
Posi Office Box 82639
Oklahoma Cily Oklahoma 73148
Motor Division
2617 South Agnev,
Telephone (,105) 634 `1,445
Translormer Division
6501 Southeast 74th S~re{'
Telephone (`105) '37 56~)'
WARRANTY
The Company's warranty clause is as follows:
"Southwest Electric Company warrants its repair to be of the
kind and quality described herein and also warrants its work-
manship and materials to be free of defects at the inception
of the applicable period specified below.
NO OTHER WARRANTY SHALL BE IMPLIED, AND ANY STATUTORY WARRAN-
TIES SHALL BE DEEMED WAIVED.
If within one year from date of energization, not to exceed
eighteen months from date of shipment, Purchaser discovers
that the equipment is not as warranted and promptly notifies
Southwest Electric Company of such failure, in writing,
Southwest Electric Company will be obligated and shall have
the right to remedy such failure by, at Company's option, ad-
justment, repair, or replacement of the defective workmanship
and/or material. Purchaser shall assume all responsibility
and expense for removal, reinstallation and freight in con-
nection with the foregoing remedies. Southwest Electric Com-
pany shall have the right of disposal of parts replaced by it
hereunder.
Southwest Electric Company's liability to Purchaser whether
in contract or in tort arising out of warranties, representa-
tion, instructions, or defects from any cause, shall be lim-
ited exclusively to correcting the equipment and under the
conditions as aforesaid."
June 8, 1992
Southwest Electric Co.
Oklahoma City Oklahoma 73148
Motor Division
2617 Sou[h Agne,,,
Telephone (405) 634.4445
telephone (405) 737 569'
REDESIGN POLICY
!.0 Ail windings will be redesigned 'to minimize the short
circuit forces. A computer short circuit analysis
will be made to verify that the transformer will meet
the short circuit withstand requirements of ANSI/IEEE
C57.12.00-1987 or the latest revision.
2.0 All windings will be redesigned using rectangular cop-
per conductor with thermally upgraded insulation. All
windings will meet the original guaranteed temperature
rise.
2.1 The High Voltage and Low Voltage windings will be a
single or multi-strand disc er a multi-strand helical
winding. (Layer type main windings will be changed to
a disc or a helical winding.) Completed windings will
be dried and presized to designed dimensions.
On LTC Transformers, the tapped LTC winding will be a
separate layer or disc type winding. This winding
will be so distributed as to give the minimum unba!-
anco, thereby giving minimum short circuit forces.
2.3 Ail winding cylinders will be precompressed high den-
sity material. All radial spacers will be precompres-
sed high density material with rounded edges.
3.0 Mechanical redesign as dictated by short circuit
analysis will be made due to the increased static
clamping pressure applied on the windings to limit the
axial movement during short circuit. The modifica-
tions are as follows:
3.1 All steel or fiber clamping rings or partial clamping
plates will be replaced with full non-metallic high
density top clamping rings. These clamping rings will
be of sufficient size to restrain the static and short
circuit pressures and to give full radial spacer sup-
port. These non-metallic rings provide three main
benefits:
A) No losses due to circulating currents.
B) Complete and even clamping pressure to all areas
of all coils.
C) No possibility of core grounds or core burning if
ring comes into contact wit}] the core steel.
3.2 The bottom support will be modified or material added
to provide full coil spacer support.
3.3 Additional rows of radial spacers will be added as
needed to limit mechanical stresses in the winding
conductors to acceptable values.~
3.4 Jack bolts, lock irons and tie rods will be added or
modified as required to restrain the static and short
circuit forces.
3.5 Additional gussets and bracing will be added to the
top and bottom mechanical structures as required.
4.0 The core will be thoroughly cleaned and inspected.
4.1 All metallic core bolts in the legs will be eliminated
or replaced with non-metallic bolts. This will
minimize possible future core grounds at these loca-
tions. The core will be sufficiently blocked to pre-
vent movement of the core laminations.
4.2 All core insulation material will be replaced with new
insulation, this includes the insulation on the lock
irons and the top and bottom steel clamping struc-
tures.
4.3 The core ground strap will be brought up to the under-
side of the tank cover adjacent to a manhole to fa-
cilitate the testing of the core insulation.
5.0 All insulation in the core opening will be new. Mate-
rials subject to high mechanical stresses will be high
density.
6.0 The Tap Changer for De-energized Operation (T.C.D.O.)
and in LTC Transformers the LTC mechanism will be
thoroughly cleaned, inspected for defective or worn
parts, and checked for proper operation prior to reas-
sembly.
7.0 All CT's within the tank and all other auxiliary wind-
ings within the tank will be thoroughly flushed,
cleaned, dried and tested. For LTC Transformers, this
will include the series transformer and the preventive
autotransformer.
7.1 Ail cable leads and the lead support structure will be
thoroughly cleaned and inspected for damage before re-
using.
7.2 All gauges, valves and accessories will be inspected
and checked for proper operation. All bushings will
be inspected and preliminary tests made prior to re-
7.3 All gaskets used for air or oil seal will be replaced.
This is to include, where applicable, all of the gas
kets in the LTC panel between the main tank and the
LTC housing.
8.0 Prior to tanking, the transformer core and coil as-
sembly will be vacuum dried. The insulation power
factor will be monitored during dry out.
9.0 Prior to retanking the core and coil assembly, the
tank and radiators will be thoroughly flushed, cleaned
and dried. The tank will then be properly prepared
for painting. After assembly, the transformer will be
vacuum filled and all gasketed equipment will be thor-
oughly tested and checked for leaks.
10.0 The following tests will be performed on the reman-
ufactured transformer in accordance with the latest
revision of ANSI or IEEE specification (ANSI
C57.12.00, ANSI C57.12.90), except as noted.
10.1 DC Resistance: Made with a resistance bridge at ambi-
ent temperature and converted to 75 degree C. Resis-
tance measurements are taken at rated voltage position
and tap extremes of all windings.
10.2 Insulation Power Factor: Tests are made on the com-
pleted unit with a Doble test set.
10.3 Core Insulation Resistance: A Megger test is made
from core to ground before shipment.
10.4 Ratio: Ratio tests are made between windings several
times during reassembly and at final testing at all
tap connections. A Biddle TTR test set is used.
10.5 No Load Test: Excitation loss and excitation current
is tested at rated frequency at 100% and 110% rated
voltage.
10.6 Impedance and Load Loss: Tested at rated voltage po-
sition and at tap extremes between all windings.
10.7 Polarity and Phase Rotation: Made on the rated voltage
position.
10.8 Applied Potential: This test is made on all windings
at full ANSI test level, 60 Hz for one minute.
10.9 Induced Potential: Test level is two times normal
voltage or as required by ANSI standard. Test is made
with 180 Hz generator for 7200 cycles.
10.10 Bushing Tests: Bushings are individually tested with
a megger before final assembly. The bushing power
factor is also tested with the capacitance bridge and
with the Doble test set. After the bushings are
mounted on the transformer they receive full dielec
tric tests with the transformer.
10.11 Power Factor: (Maximum 0.5% corrected to 20 degree C)
10.12 Dew Point: (Immediately prior to shipment)
10.13 In addition to the Standard Production Tests listed
above, each of the following tests are available and
will be quoted as an option when requested.
Lightning Impulse
Front of Wave Impulse
Switching Impulse
Partial Discharge (Corona)
Partial discharge in pico coulombs and RIV in micro-
volts will both be measured and recorded during the 1
hour induced test.
Temperature Rise
Zero Sequence Impedance.
10.14 A certified Test Report will be supplied which includes
results of the above tests and winding connections as
shipped.
11.0 The transformer will be completely repainted.
12.0 All units will be equipped with an auxiliary nameplate
or a new nameplate, as required, to indicate changes
and date of remanufacture. If a complete new name-
plate is required, a new nameplate drawing will be
supplied.
13.0 If required, a final report will be supplied which in-
cludes a transformer repair record that details
changes made in the design. Photographs of the
original transformer and the redesigned and remanufac-
tured unit will be included.
September 2, 1992