TRANSFORMERS SINGLE PHASE TYPE PEDESTAL

UNTIL 100 kVA FOR DISTRIBUTION UNDERGROUND

SPECIFICATION
CFE K0000-04

HE Attached FE of Errata 160316

MAY 2015
REVIEW AND REPLACE THE
EDITION OF NOVEMBER 2007

MEXICO
 TRANSFORMACIÓN MONOFÁSICOS TIPO ESPECIFICACION
PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

CONT IN Yo d EITHER

1 OBJECTIVE 1

2 FIELD APPLICATION 1
3 RULES THAT APPLY 1

4 CHARACTERISTICS AND CONDITIONS GENERAL 2

4.1 Conditions Service 4

4.2 Specifications Electrical 5

4.3 Values of Guarantee 6

4.4 Elevation of Temperature 6

4.5 Specifications of Construction 6

4.6 Specifications Mechanics 9

4.7 Disconnector for Operation in Ring 9

4.8 Protection 9

4.9 Oil 12

4.10 Bushings 12

4.11 Dimensions Highs 12

4.12 Accessories 12

4.13 Covering Anticorrosive and Color 13

4.14 Drawings 13

4.15 Life Useful Expected 14

5 CONDITIONS OF OPERATION 14

6 CONDITIONS OF DEVELOPMENT SUSTAINABLE 14

7 CONDITIONS OF SECURITY INDUSTRIAL 14

8 CONTROL OF QUALITY 14
8.1 Tests 15

9 MARKED 16

9.1 Plate of Data 16

9.2 Pair of Tighten 16

9.3 Characteristics of the Fuses 16

9.4 Nozzle Identification 16

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

9.5 Number of Series 16

9.6 ID Internal 17

9.7 ID External 17
9.8 Signs Preventive of Risk 17

10 PACKING, PACKAGING, SHIPMENT, TRANSPORTATION, DOWNLOAD,

RECEPTION, STORAGE AND MANAGEMENT 17
11 BIBLIOGRAPHY 17
12 CHARACTERISTICS INDIVIDUALS 17

APPENDIX TO REQUIREMENTS FOR THE PRESENTATION OF PLANS 21

APPENDIX b INFORMATION TECHNIQUE REQUIRED 22

TABLE 1 Single-phase pedestal-type transformers up to 100 kVA for underground distribution 2 TABLE 2

Losses maxims in switches 6

TABLE 3 Combinations of materials of tank and cabinet 8

TABLE 4 Characteristics of the element of ejection type fusion 11

TABLE 5 Characteristics of the fuse limiter stream 11

TABLE 6 Dimensions maxims of transformers single-phase type pedestal 8

TABLE 7 Specified values for coatings anticorrosive in test tubes 9

FIGURE 1 Diagram electric without equipment of protection in BT 10

FIGURE 2 Location and separation minimum of terminals 18

FIGURE 3 Exterior view of the transformer with cabinet of a section 19

FIGURE 4 Exterior view of the transformer with cabinet of two sections 19

FIGURE 5 Preventive signal and of risk 20

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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1 PURPOSE
Establish the characteristics that they must achieve the transformers of distribution single-phase until 100 kVA type
pedestal that They installed in the networks of distribution underground of the Federal Commission of Electricity (CFE).

2 APPLICATION FIELD
HE apply to transformers with cooling natural in oil mineral, single-phase until 100 kVA, for operate insystems with
nominal voltages up to 34.5 kV.

3 RULES THAT APPLY

SEDE /ENER-2014 Safety and Energy

Efficiency Requirements for
Transformers of Distribution.

NOM-008-SCFI-2002 System General of Measurement units.

NMX-J-123-ANCE-2008 Transformers- Insulating Mineral Oils for

Transformers -Specifications, Sampling and
Methods Proof.

NMX-J-153-1972 Classification of Materials Insulators.

J-169-ANCE-2004 Distribution Transformers and

Autotransformers andPower-Methods
test.

NMX-J-285-ANCE-2013 Transformers Type Pedestal Single phase and Three-phase for

Distribution Underground-Specifications.

NMX-Z-012-1-1987 Sampling for the Inspection by Attributes – Part 1 - Information

General and Applications.

NMX-Z-012-2-1987 Sampling for the Inspection by Attributes – Part 2 - Information

General and Applications. Method of Sampling, TABLEs and Graphics.

NMX-Z-012-3-1987 Sampling for the Inspection by Attributes – Part 3 - Ruler of

Calculation for the Determination of Plans of Sampling.

ISO ISO 261-1998 General Purpose Metric Screw Threads - General Plan.

NRF-002-CFE-2009 Manuals Technicians.

NRF-071-CFE-2010 Systems of Protection Anticorrosive for Equipment Electric

Installed to the Outdoor.

CFE-55000-99-2011 Systems of Connectors Insulated Separable of Half

CFE 58100-07-1998 Terminals of Half Voltage Type Well.

CFE GCUI0-68-1995 Indicator of Failure.

CFE K0000-03-1999 Evaluation and Penalty of Collateral

Values in _
Transformers of Distribution.

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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CFE L0000-15-2012 Colors normalized

NOTE: In case of that the documents previous be reviewed either modified, has to be used the edition current in the date of
publication of the announcement to the tender, except that the CFE indicate something else

4 CHARACTERISTICS AND CONDITIONS GENERAL

The transformers to the that he refers this specification he indicate in the TABLE 1 and 1A, and they must achieve
with itindicated in the present and it applicable of the rule NMX-J-285-ANCE. They must be of the type of forehead dead.

TABLE 1 - Transformers single-phase type pedestal until 100 kVA for distribution underground

Rated Rated Lightning impulse

capacity voltage and withstand voltage Description short
connection normalized
s Normal Warm
(kVA) (kV Crest)
(Vrcm)
pedestal transformer pedestal transformer
13 200YT/7 620-
25 D1SP-25-13200YT/7 D1SPCA-25-13200YT/7 620-
240/120
620-240/120 240/120
pedestal transformer pedestal transformer D1SPCA-
13 200YT/7 620-
37.5 D1SP-37.5-13200YT/7 37.5-13200YT/7 620-240/120
240/120
620-240/120
pedestal transformer pedestal transformer
13 200YT/7 620-
fifty 95 D1SP-50-13200YT/7 D1SPCA-50-13200YT/7 620-
240/120
620-240/120 240/120
pedestal transformer pedestal transformer
13 200YT/7 620-
75 D1SP-75-13200YT/7 620- D1SPCA-75-13200YT/7 620-
240/120
240/120 240/120
pedestal transformer pedestal transformer
13 200YT/7 620-
100 D1SP-100-13200YT/7 620- D1SPCA-100-13200YT/7 620-
240/120
240/120 240/120
pedestal transformer pedestal transformer
22 860YT/13 200-
25 D1SP-25-22860YT/13 200- D1SPCA-25-22860YT/13 200-
240/120
240/120 240/120
pedestal transformer D1SP- pedestal transformer D1SPCA-
22 860YT/13 200-
37.5 37.5-22860YT/13 200- 37.5-22860YT/13 200-240/120
240/120
240/120
pedestal transformer pedestal transformer
22 860YT/13200-
fifty 125 D1SP-50-22860YT/13 200- D1SPCA-50-22860YT/13200-
240/120
240/120 240/120
pedestal transformer pedestal transformer
22860YT/13200-
75 D1SP-75-22860YT/13200- D1SPCA-75-22860YT/13200-
240/120
240/120 240/120
pedestal transformer D1SP- pedestal transformer D1SPCA-
22 860YT/13200-
100 100-22860YT/13200- 100-22860YT/13200-240/120
240/120
240/120

Continúa…
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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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Continuación…

pedestal transformer pedestal transformer

33 000YT/19 050-
25 D1SP-25-33000YT/19050- D1SPCA-25-33000YT/19050-
240/120
240/120 240/120
pedestal transformer D1SP- pedestal transformer D1SPCA-
33 000YT/19 050-
37.5 37.5-33000YT/19 050- 37.5-33000YT/19050-240/120
240/120
240/120
pedestal transformer pedestal transformer
33 000YT/19 050-
fift 150 D1SP-50-33000YT/19050- D1SPCA-50-33000YT/19050-
240/120
y 240/120 240/120
pedestal transformer pedestal transformer
33 000YT/19 050-
75 D1SP-75-33000YT/19050- D1SPCA-75-33000YT/19050-
240/120
240/120 240/120
pedestal transformer D1SP- pedestal transformer D1SPCA-
33 000YT/19 050-
100 100-33000YT/19050- 100-33000YT/19050-240/120
240/120
240/120

TABLE 1A - Single-phase pedestal-type transformers up to 100 kVA for distribution

underground with switch thermal or thermomagnetic

Rated Rated Lightning

capacity voltage and impulse Short Description
connections withstand
voltage
normalized Normal Warm
(kVA) (Vrcm)
(kV Crest)
pedestal transformer
13 200YT/7 620- pedestal transformer DT1SP-
25 DT1SPCA-25-13200YT/7 620-
240/120 25-13200YT/7 620-240/120
240/120
pedestal transformer DTM1SP- pedestal transformer DTM1SPCA-
13 200YT/7 620-
37.5 37.5-13200YT/7 620-240/120 37.5-13200YT/7 620-240/120
240/120

pedestal transformer pedestal transformer

13 200YT/7 620-
fifty 95 DTM1SP-50-13200YT/7 620- DTM1SPCA-50-13200YT/7 620-
240/120
240/120 240/120
pedestal transformer pedestal transformer
13 200YT/7 620-
75 DTM1SP-75-13200YT/7 620- DTM1SPCA-75-13200YT/7 620-
240/120
240/120 240/120
pedestal transformer pedestal transformer
13 200YT/7 620-
100 DTM1SP-100-13200YT/7 620- DTM1SPCA-100-13200YT/7 620-
240/120
240/120 240/120
pedestal transformer pedestal transformer
22 860YT/13 200-
25 DT1SP-25-22860YT/13200- DT1SPCA-25-22860YT/13200-
240/120
240/120 240/120
pedestal transformer DTM1SP- pedestal transformer DTM1SPCA-
22 860YT/13 200-
37.5 125 37.5-22860YT/13200-240/120 37.5-22860YT/13 200-240/120
240/120

pedestal transformer pedestal transformer

22 860YT/13 200-
fifty DTM1SP-50-22860YT/13200- DTM1SPCA-50-22860YT/13200-
240/120
240/120 240/120
Continúa…

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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Continuación…

pedestal transformer pedestal transformer

22 860YT/13 200-
75 DTM1SP-75-22860YT/13200- DTM1SPCA-75-22860YT/13200-
240/120
240/120 240/120
pedestal transformer DTM1SP- pedestal transformer DTM1SPCA-
22 860YT/13 200-
100 100-22860YT/13200-240/120 100-22 860YT/13 200-240/120
240/120
pedestal transformer pedestal transformer
33 000YT/19 050-
25 DT1SP-25-33000YT/19050- DT1SPCA-25-33 000YT/19050-
240/120
240/120 240/120
pedestal transformer DTM1SP- pedestal transformer DTM1SPCA-
33 000YT/19 050-
37.5 37.5-33000YT/19050-240/120 37.5-33 000YT/19050-240/120
240/120
pedestal transformer pedestal transformer
33 000YT/19 050-
fifty 150 DTM1SP-50-33000YT/19050- DTM1SPCA-50-33 000YT/19050-
240/120
240/120 240/120
Transformer pedestal Transformer pedestal
33 000YT/19 050-
75 DTM1SP-75-33000YT/19050- DTM1SPCA-75-33 000YT/19050-
240/120
240/120 240/120
Transformer pedestal Transformer pedestal
33 000YT/19 050-
100 DTM1SP-100-33000YT/19050- DTM1SPCA-100-33000YT/19050-
240/120
240/120 240/120

Meaning of the abbreviations of the description short.

d Distribution TM Thermomagnetic SP Underground-Pedestal

T Thermal 1 Monophase AC Warm

25, 37.5, fifty, 75, Rated capacity in kVA

100
13 200/7 620 Rated voltage in medium voltage in volts
22 860/13 200 Rated voltage in medium voltage in volts
33 000/19 050 Rated voltage in medium voltage in volts
240/120 Rated voltage in low voltage in volts
Y.T. Type of Connection

4.1 Conditions of Service

4.1.1 Altitude

The transformers single-phase to that he refers this specification they must be built for operate to 2 300 m
snm

4.1.2 Ambient Temperature

The transformers to that he refers this specification they must be designed for operate to a a m b i e n t
temperature maximum of 40 °C and to a temperature half of 30 °C in a period of 24 h.

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SUBTERRÁNEA CFE K0000-04

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4.2 Specifications Electrical

4.2.1 Rated capacities

The capabilities nominal are: (25, 37.5, 50, 75 and 100) kVA.

4.2.2 Rated voltage

The rated voltage primaries are: (13 200YT/7 620) V, (22 860YT/13 200) V and (33 000YT/19 050) V.

The rated voltage secondary is: (240/120) V.

4.2.3 Connections

The connection in half voltage has to be of phase to

land.The Connection in down voltage has to be trifilar.

4.2.4 Impedance

The impedance voltage must be measured at nominal current and frequency. The impedance expressed in percent of
the impedance voltage and with respect to the nominal voltage is corrected to the reference temperature of 75 °C for
transformers type warm and 85 °C for transformers normal and has to achieve with the values indicated in the rule
NMX-J-285-ANCE.

The bidder must report the impedance value along with the proposal. Value that should be considered for the evidence
of acceptance.

4.2.5 Current of excitement

The excitation current should not be more than 1.0%. The bidder must inform the value of the excitation current
together with the proposal.

4.2.6 Losses in empty and totals

The values of losses in maximum vacuum Pv and totals Pt they must achieve with the rule NMX-J-285-ANCE.

4.2.7 Efficiency

The efficiency of the transformers covered by this specification, at nominal load and considering factor of unitary
power, must comply with what is indicated in the NOM-002-SEDE standard. The bidder must indicate the value of the
efficiency together with his proposal.

4.2.8 Polarity

The polarity has to be subtractive.

4.2.9 Losses in switches thermal and thermomagnetic

The switches employees in secondary protection They should have losses minors to those established in the TABLE
2.

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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TABLE 2 - Losses maxims in switches

Capacities Losses maxims (W)

(kVA) 75 °C 85 °C
25 23 24
37.5 3. 4 35
fifty 43 45
75 68 70
100 102 105

NOTE: These losses No HE find included in the losses totals indicated in the rule NMX-J-285-ANCE.

4.3 Values of Warranty

Guarantee nominal values of: excitation losses and voltage losses must be provided. load, which must comply with the
provisions of this specification and are subject to bidding and penalties according to the CFE specification K0000-03.

4.4 Elevation of Temperature

The object transformers of this specification they must be for a elevation of Temperature of 65 °C.

The CFE may request a temperature increase of 55 °C, subject to bidding with those of 65 °C in equal quantities.
conditions.

4.4.1 Transformers type warm

In the Particular Characteristics it must be indicated when they are required. If not done, it is understood that the
transformers required are for install in environments with temperature normal as HE describe in he subsection 4.1.2.

Warm pad-type transformers used in hot climate areas where the maximum temperature of the ambient exceeds 40°C
and the average ambient temperature during any 24-h period exceeds 30°Cthey must comply with it following:

Elevation of temperature average of the windings of 55 °C, with ability thermal of the isolations of 65 °C.

4.5 Specifications of Construction

The transformers object of this specification they must achieve with it indicated to continuation.

a) Where No he specify, the location of the different items (fuses, crank of operation, among others)
must be such that it does not prevent or be impeded its operation and/or replacement, by the the
rest items of the transformer neither by the cables once that these be installed.

b) He background and he clear minimum of the cabinet must have the following dimensions.
Voltage Distance Clear
kV (cm) (cm)
fifteen 33 27.94
25.33 40.64 35.56
c) The cabinet shall have grade 316 stainless steel hinges at the top, positioned in such shape that
he cabinet No can break off and has to be folding toward above for that

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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rest on top of tank. It must have flashings so that when opened, the Deposited water is not poured
onto the accessories and cables of the transformer. You must have a device located at the bottom
and center of the cabinet to open or close it and count with a holder padlock.

d) When the force required to be applied to the cabinet to open it is greater than 245.16 N, it It must be
made up of two sections with grade 316 stainless steel hinges on the back. top, positioned in such a
way that the cabinet sections cannot be detached and must be be foldable upwards so that they
rest on the top of the tank. One for the down tension and another for the half voltage, which should
not be opened without first opening the low voltage. The union between sections for the half and the
low voltage must be such that it does not allow the entry of water inside. The two sections of the
cabinet must have flashings so that when they are open, the deposited water does not spill on the
accessories and cables of the transformer. Has to have a device located at the bottom and center of
the cabinet to open or close when himself and count on a holder padlock.

e) The bridges of half tension should be made with flexible copper cables of the porta type electrode,
that have one section cross of the ampacity appropriate.

f) The connections between shoes and bridges must be soldered or by means of connectors
compression.

g) The nuts used in electrical connections must be safety type and have locknut or any half that
prevent he loosen

h) He tank and The gabinet they must achieve with what is indicated in he paragraph 4.13 and with he
subsection 4.5.7

i) The tank cover must be welded, without hand register and with a slope of 1° to 2° to avoid the
accumulation of water in the surface,.

j) The cabinet lid should have a slope of 1° to 2° to prevent water accumulation in the surface.

k) Screws in contact with the environment must be made of grade stainless steel. 304 or 316, their
corresponding nuts and sheaves they must be of steel grade stainless 304.

l) The tightening screws of the nozzle flanges half and low voltage must have a locknut either any
half that prevent that HE loosen

m) The expulsion fuses must be provided with anti-spill trays to prevent the take them out, he oil HE
leak about the cables.

n) The lock must be provided with a padlock holder and be such that it cannot be used as a nest of
animals and insects.

4.5.1 changing table of derivations

These equipment No They carry changing table of derivations to less that the CFE it require in whose case HE has to
indicate inthe Characteristics Individuals.

When it require, he changing table of derivations has to be of operation abroad and achieve with it indicated in the
rule NMX-J-285-ANCE.

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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4.5.2 Points of Union

All permanent current-carrying connections, except threaded connections, must be joined by welding or through
connectors type compression.

4.5.3 Connection of the core to the tank

He core has to meet electrically connected to the tank in a only spot by half of a driver of copper.

4.5.4 Driver of the windings

The conductor of the windings in half and low voltage must be made of copper and/or aluminum, with the mechanical
resistance necessary for bear the efforts of short circuit of agreement with the rules NMX-J-169-ANCE and NMX-J-
285-ANCE.

4.5.5 Isolation of the drivers

The insulation must be compatible with the transformer oil, its thermal class must be at least 105, according to the
NMX-J-153-ANCE standard; In addition, its dielectric, chemical, mechanical, thermal characteristics, among others,
they must be properly selected for he correct functioning of the transformers here specified.

4.5.6 Frame for the base

Has to count with a base that medium he weight of the transformer and that allow move it to it long of their axles
longitudinal and transversal by half of rollers.

All the zones of the cabinet in contact with he pedestal they must be designed for reduce to the maximum his
corrosionand comply with he paragraph 4.13.

4.5.7 Material of the tank and cabinet

He tank and he cabinet they must be manufactured of a material whose characteristics comply with any of the
steels AISI-1018, AISI-1025 AND ASTM A-36.

In a coastal or pollution zone, grade 304, 316 or metallized stainless steel should be used, as indicated. indicate in
Features Individuals and according to the TABLE 3.

TABLE 3 - Combinations of materials of tank and cabinet

Options Tank Cabinet

1 Stainless
Stainless
2 Metallic
3 Metallic Metallic

4.5.8 Indicator of failure

These equipment No they will carry indicator of failure to less that CFE it require in whose case HE has to indicate
in the
Characteristics Individuals.

In case of have indicator of failure the covers either indicators luminous they must be installed in the wall frontal
either side of the cabinet, of the side of half voltage (corner superior left) and protected for avoid damage by
vandalism, of such shape that HE can appreciate he state of the indicator without open the door of the cabinet.
(See figure 4).
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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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He indicator of failure has to achieve with the specification CFE GCUI0-68.

4.6 Mechanical Specifications

4.6.1 System of strings

The ropes of nuts, screws and plugs they must correspond to the of the system international of units (NOM-008-SCFI)
and be of agreement with the rule ISO 261.

4.6.2 Cleaning in it inside of the tank

The interior of the tank must be free of debris, burrs or any other foreign element, which is deposited in the
background of the tank, in the reels either stay suspended in he oil.

4.6.3 Endurance mechanics from the tank

He tank of the transformer has to be built for bear, completely assembly, a pressure internal of 69 kPa during 2 h,
either a pressure internal minimum of fifty kPa during 3 h, without introduce a deformation final elderlyOf 2 %.

4.6.4 Endurance mechanics of the cabinet

The transformer must have a cabinet in which the medium and low voltage terminals are housed, as well as the
accessories, which must prevent the entry of water that affects the operation of the transformer. Should not have
screws exposed or other fastening means that can be removed from the outside nor holes through which can be
introduced foreign objects like rods either wires.

The thickness of the cabinet sheet must be according to the supplier's design and have the mechanical resistance
necessary for bear he driving normal, so much in he transport as in he mounting, without that suffer deformation
some owing pass the evidence that indicate in this specification.

All areas of the cabinet in contact with the pedestal must be designed to minimize corrosion and achieve with the
paragraph 4.13.

4.7 Disconnector for Operation in Ring

The disconnector for ring operation must be provided by separable insulated connectors type elbow operation. with
burden for 200 TO.

The connections and internal elements of the transformer that are part of the ring must be designed to bear the current
keep going and of failure of the ability of the ring.

The endurance maximum measure between the Bushings of the side to and of the side b has to be equal or less to 200
 .

4.8 Protection

He diagram electric he sample in the figure 1.

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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FIGURA 1- Diagrama eléctrico sin equipo de protección en B.T.

4.8.1 En media tensión

Transformers must have two fuses connected in series and properly coordinated each other. Both fuses they must be
submerged in oil in he inside of the tank which are described at continuation:

a) Fuse of expulsion "FE" of double element type bayonet operation internal, that can bereplaced
externally by medium pole with the characteristics indicated in the TABLE 4.

b) Fuse limiter of current "FLC" of sand silver of interval partial with characteristics indicatedin the
TABLE 5.

He fuse of expulsion "FE" has to operate only when happen a failure of low current internal in he transformer and/or an
open fault in the low voltage network and have the capacity to interrupt load current of according to it indicated in the
TABLE 4.

He fuse limiter of "FLC" current of interval partial has to interrupt high currents.

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PEDESTAL HASTA 100 kVA PARA DISTRIBUCIÓN
SUBTERRÁNEA CFE K0000-04

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TABLE 4 - Characteristics of the element of fusion type expulsion

Voltage nominal NBAI Current

Transformer Fuse interruption
asymmetric
(kV rmc) (kV rmc) (kV) crest effective
(TO)
13.2 / 7.62 8.3 95 3 000
22.86 / 13.2 fifteen 125 1 800
33.0 / 19.0 23 150 600

TABLE 5 - Characteristics of the fuse limiter of current

Voltage nominal NBAI Current

Transformer Fuse Interruption
asymmetric
(kV rmc) (kV rmc) (kV) crest effective
(TO)
13.2 / 7.62 8.3 95 25 000
22.86 / 13.2 fifteen 125 25 000
33.0 / 1.0 23 150 fifty 000

4.8.2 In low voltage

When indicated in the Particular Characteristics , a thermal switch or thermomagnetic in the secondary, immersed in
oil, placed on the low voltage side according to the capacity of the transformer and coordinated with the single element
expulsion fuses and interval current limiter partial whose general characteristics are contained in tables 4 and 5
described above, and must comply with the following:

a) For 25 kVA transformers, it must have a low voltage thermal switch, which has thermal trip against
overloads and short circuits. Its interrupting capacity must be as minimum 6 000 TO symmetrical
effective.

b) For transformers of (37.5, 50, 75 and 100) kVA, it must have a thermomagnetic switch of low
voltage, which has instantaneous trip for short circuit protection, and its capacity interruptive must be
as minimum of 10 000 TO symmetrical effective.

The switches indicated in the points to) and b) they must count with it following:

a) Have emergency control that allows the transformer to temporarily carry an overload of
approximately 10 % of his Rated capacity,

b) The operating handle must be located in the low voltage compartment and be constructed for
operate with pole.

When the transformer is supplied with a thermal or thermomagnetic switch, they must be included on the data plate.
the following characteristics of the switch: brand, type, number of Catalogue, voltage nominal, Rated capacity,

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ability interruptive (amps symmetrical) and he level essential of isolation to the impulse. Additionally he has to include
his location in the diagram unifilar The data of the switch they can include in a plate for separate.

4.9 Oil

The supplier must supply the transformers with the necessary insulating oil, which must be of the specified type. in the
rule NMX-J-123-ANCE.

4.10 Bushings

The Bushings half and low voltage must be removable, to be able to be removed from the outside. No they must weld
to the wall of the tank for it that they must be installed through a system screwable.

4.10.1 Bushings in half voltage

It must have two well-type Bushings installed in a horizontal position in such a way that the oil from the equipment
covers completely the internal part of the terminal in accordance with the provisions of the CFE 55000-99 specification,
located as indicated in figure 2. The Bushings must be protected with covers weatherproof during transportation or
storage.

It must have two well-type Bushings installed in a horizontal position in such a way that the oil from the equipment
covers completely the part internal of the terminal.

4.10.2 Bushings of low voltage

It must have three bolt-type Bushings of dimensions, driving capacity and rope suitable for can install straight
connectors for at least 4 circuits, compatible with various brands and localized as he indicates in the figure 2. He
supplier has to provide these connectors.

4.10.3 Bushings and Connection of the neutral

The low voltage neutral must exit through an insulated bushing and must be connected externally to the tank by half of a
bridge removable of copper flexible, proportionate by the supplier.

4.11 Dimensions Maxims

The transformers referred to in this specification must not exceed the maximum dimensions indicated in the rule NMX-
J-285-ANCE.

4.12 Accessories

4.12.1 Connection for filling and proof of air tightness

A 25.4 mm diameter nipple with a weatherproof material plug must be placed on the wall of the tank and on the side of
low voltage for he fill and proof of air tightness.

4.12.2 Joints (packaging)

The joints (gaskets) must be made of an elastomeric material that meets the characteristics indicated in the table 12 of
the NMX-J-285-ANCE standard, compatible with the insulating liquid, according to the method and limits indicated in
he Appendix B of the rule NMX-J-285-ANCE.

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4.12.3 Valve of relief of about pressure

The valve relief manual and automatic, has to achieve with it indicated in the rule NMX-J-285-ANCE.

4.12.4 Others accessories

a) Hooks for lift the transformer complete, the which they must be removable.

b) He has to place a nipple of 25.4 mm of diameter with plug of material to proof of outdoor,in the
wall of the tank and of the side low voltage for sewer system and sampling.

c) Medium for nozzle stationary.

4.13 Anti-corrosion coating and Color

The tank and the transformer cabinet must have a coating that protects them against corrosion, which in turn time, has
to comply with the values indicated in the rule NMX-J-285.

The supports of the core-coil assembly must be free of oxidation and must not necessarily have covering.

He color must be 12 dark green of according to the specification CFE L0000-15.

Alternatively he can use he color Munsell 7GY 3.29/1.5 (“ANSI” pedestal green): L* = 31.07, a*= -7.73, b* = 8.11,
which must comply with the standardized “CIELAB” alternative color scale, with the observer at two degrees and light
of day.

For all colors the maximum acceptable color difference is 2.5 measured according to reference [1] of the chapter 11 of
this specification.

In any case, the supplier must provide a written guarantee corresponding to the treated surface, so as not to require
maintenance during 10 years.

4.14 Drawings

Before proceeding to manufacture the prototype, the supplier must deliver to the Normalization Management
Distribution, a game of the following drawings, for your review and approval, according to the Procedure of delivery
and revision of plans of transformers of distribution underground.

a) Of the core and coils.

b) Of the changing table of derivations.

c) Sheet of coordination of protections.

d) Of the plates of:

- Data,

- peers of squeeze in,

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- characteristics of the fuses.

e) Of dimensions generals,

f) Of the armed and interior arrangement.

The drawings they must comply with it described in he Appendix to of this specification.

He made to approve the drawings No exempt to the supplier of the responsibility and obligation of correct any flaw
either deficiency that means danger either evil operation and that there would not have been been noticed in the
drawing review.

Subsequently, he supplier has to introduce to the Management of LAPEM either the person physical either moral that HE
designate witheach prototype a game of approved drawings.

4.15 Life Useful expected

The transformers they must be designed and manufactured for reach a life useful expected of when lesstwenty
years, low the conditions of operation and atmosphere defined in the present specification.

4.16 Information Technique

By each place of delivery, he supplier has to deliver with his equipment, a manual of operation and maintenance
writings in language spanish from according to it indicated in the rule of reference NRF-002-CFE.

In the manuals HE they must include the recommendations of overload and The pairs of

squeeze in.He bidder must provide to the CFE the data That request in it Appendix B.

5 CONDITIONS OF OPERATION

No applies.

6 CONDITIONS OF DEVELOPMENT SUSTAINABLE

No Apply.

7 CONDITIONS OF SECURITY INDUSTRIAL

No applies.

8 CONTROL OF QUALITY

The CFE represented by the Management of the LAPEM either the person physical either moral that this designate,
has to verify thatall the transformers comply with the evidence of prototype and of acceptance contained in this chapter.

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8.1 Evidence

All tests must be carried out on all transformers, in accordance with the NMX-J-123-ANCE standards, NMX-J-169-
ANCE and NMX-J-285-ANCE, in the order that HE enunciate to continuation:

8.1.1 Evidence to components

The transformer supplier is responsible for carrying out the evaluation and monitoring of the quality of its subsuppliers,
as well as being responsible for the quality and the consequences derived from defects that they could introduce
oneself in any of the supplied components by third parties.

8.1.2 Evidence acceptance

They must be carried out the following sampling tests in accordance with standard NMX-Z-012, part 1, 2 and 3, to
which transformers in presence of the staff of LAPEM of control of Quality either representative:

a) Characteristics physical.

b) Endurance of isolation of the windings.

c) Factor of power of the isolations.

d) Rigidity dielectric of the liquid insulating.

e) Relationship of transformation and polarity.

f) Endurance to the voltage of 60Hz, 60 s.

g) Voltage Induced.

h) Endurance ohmic of the windings.

i) Measurement of the current of excitement to voltage nominal.

j) Measurement of the losses in empty to voltage nominal.

k) Measurement of the tension impedance to current nominal.

l) Measurement of the losses due to the burden.

m) Calculation of the efficiency to 100 % of the burden.

n) Endurance mechanics of the tank.

o) check of the operation of the valve of overpressure.

8.1.3 Evidence of prototype

Are he they must carry out to a unit representative of the design.

a) Short circuit.

b) Normalized lightning impulse withstand voltage.

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c) Temperature rise of the windings.

Besides of achieve with these essays, has to of satisfy the evidence of acceptance.

Any changes made by the supplier in the materials or design of the transformer invalidate the testing.prototype.

The absorption rate test is not applicable to transformers with thermal or thermomagnetic switching in low voltage, in
the test resistance of isolation of low against high further tank.

8.1.4 Values of acceptance for the evidence of isolation of the set

The values of acceptance for the evidence of the isolations of the core – coil:

a) Endurance of isolation
minimum: 1 000 MΩ by kV to twenty °C

b) Index of absorption
((60/30)s) minimum: 1.2

c) Factor of power maximum: 1.2 % applying 2.5 kV as minimum to twenty °C

9 MARKED

9.1 Plate of Data

Each transformer must have a plate that permanently shows the equipment data which must contain as minimum the
information That indicates in the rule NMX-J-285-ANCE, So as he number of the contract.

9.2 Pair of Squeeze in

An additional data plate must be provided to the data plate, permanently indicating the torques tightening of the screws
used to fasten the Bushings half and low voltage and in general where they exist together.

9.3 Characteristics of the Fuses

The characteristics of the fuses they must mark in the data plate of the transformer either in a plate additional.

9.4 ID of Bushings

The nozzle identifications must be permanent with a height of no less than 15 mm and placed in a that are not covered
by cables or connection accessories, the letters must be of a color that contrasts with that of the transformer.

9.5 Number of Series

In the prototype transformer, in the tank, the cover and the upper internal frame that fixes the core-coil assembly The
serial number of the transformer must be marked, with a strike number, at least 10 mm high, additionally to indicate it
in the plate of data.

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9.6 ID Internal

Internal points and terminals that are connected must be marked with matching numbers or letters. with those marked
on the plate. These identifications must be made using plastic tapes or labels, cardTABLE compressed either
materials Similar engraved to low relief either about relief No minor to 5 mm, clamped to each terminal or
recorded directly on it so that they can be easily seen. They can also be used ribbons engraved, but never painted
numbers or attached labels.

9.7 ID External

On the transformer tank, near the low voltage bushings, the nominal capacity data must appear. in kVA, with letters
and numbers not less than 65 mm Tall and painted in color that contrast with that of transformer.

9.8 Signs Preventive of Risk

On the outside of the transformer, on the upper front of the cabinet, 50 mm from the upper edge, it must be placed a
warning preventive permanent and reflective equal to the indicated in the figure 6.

10 PACKAGING, PACKING, SHIPMENT, TRANSPORTATION, UNLOADING, RECEPTION,

STORAGE AND DRIVING

He supplier has to send the transformers duly protected, with a base of wood of perimeter complete with
dimensions of 25 mm per side and with a minimum clearance between the base and the floor of 25 mm to avoid
crashes and frictions between the teams during he transport, driving and storage.

11 BIBLIOGRAPHY

[1] ASTM – d2244-2002 Standard practice for Calculation of Color Tolerances and
Color Differences from Instrumentally Measured Color
Coordinate.

12 CHARACTERISTICS INDIVIDUALS

In accordance with what is established in this specification and the conditions of use imposed by the user, it is made
necessary indicate in he Format exhibit, CPE-327 of the Characteristics Individuals, that complement the
requirements of specification.

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FIGURE 2 – Location and separation minimum of terminals

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FIGURE 3 - View abroad of the marked with cabinet of a section

FIGURE 4 - View abroad of the transformer with cabinet of two sections

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COLOR REASO SIGN

N
“IF IT IS OPEN PLEASE CALL” "COMMISSION FEDERAL OF
FRAMES AND OUTLINE OF
BLACK 2 ELECTRICITY TO THE PHONE071”
FIGURE
DANGER
RED 8 RAY
HIGH TENSION IN YOUR INSIDE
WHITE 1 FIGURE AND BACKGROUND --

FIGURE 5 - Preventive signal and of risk

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APPENDIX TO

REQUIREMENTS FOR THE PRESENTATION OF BLUEPRINTS

Is requirement indispensable that he supplier present blueprints for the authorization by part of CFE, the which they must
include as minimum the following information:

a) Drawings, sizing the main parts of the product, in their “plan”, “front” views (elevation) and a "side",
with notes in mm and No necessarily to scale.

b) List of component parts, referencing the concept number for ID in he drawing, indicating the
number of pieces, description of the concept and also indicating the brand, the catalog number and
the corresponding reference CFE specification number. When the concept be a electrical operating
element, indicate by separated in the same plane, in shape of TABLE the characteristics electrical
main and draw he detail correspondent.

c) All the information has to be in language Spanish, with units of extent of the System International of
Units.

d) The plans must have in the reference table at least the name of the product with the main nominal
characteristics, brand, model, type, supplier catalog number and when it is a prototype indicate it,
the CFE specification number, as well as the signatures of the relevant officials of the supplier;
authorization and validity dates. Immediately Above this box, a vertical blank space of (100 X 125)
mm should be left for stamps and satisfactory signatures. By folding the plan to letter size, the
reference table and the space for seal, they must meet in front.

e) The drawings that complement the information of “General Dimensions” and “Interior Set”, they
must introduce oneself by separate either in a single flat and are the following:

- changing table of derivations ( when he require),

- Bushings of half and low voltage,

- fuse holder and fuses.

f) Plates data: Must achieve with which establishes the rule NMX-J-285-ANCE.

g) The “General Dimensions” and “Interior Set” plans must be of a manageable size, multiple of size
letter and maximum to double letter.

h) The protection coordination sheet must be in double letter size, and may also be in size letter.

i) Blueprints of packaging indicating, material, dimensions and provision.

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APPENDIX b

INFORMATION TECHNIQUE

REQUIRED

TENDER: REQUISITION NUMBER:

Concept Characteristics offered Number of lot

Rated capacity (kVA)
Voltage primary (kV)
Voltage secondary (V)
Voltage of endurance to the impulse by ray normalized (kV
crest)
Altitude of operation (m snm)
Impedance in (%)
Current of excitement (%)
Losses empty (W)
Losses due to the burden (W)
Losses maxims totals (W)
Efficiency (%)
Compliant with "Frame for base"
Access to cables of Average and low voltage
Complete transformer
Addition for get up(hook withoil
and ears) (removable)
Core and coil of the transformer
High (mm)
Dimensions of the transformer Forehead (mm)
Background (mm)
Number of Bushings by phase in half voltage
Bushings of half voltage detachable
Number of Bushings half voltage in each transformer well type
(CFE-55000-99)

Number of Bushings of low With straight bolt

voltage in each transformer andconnector
isolated
Number of supports for Bushings stationary
Fuse of expulsion of double element by phase (Number -
Amperes)
Fuse limiter of current of interval partial by phase
(Number - Amperes)
Brand of the level of oil
Nipple for proof of air tightness
Valve of overpressure and relief
Nipple for drainage and sampling
Connection superior for filling and filtered out
Forecast for manovacuometer indicator
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Compliant with the together (packaging)
Keep going…

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Continuation…

Concept Characteristics offered Number of lot

Compliant with covering anticorrosive and color
Compliant with he material of the tank and cabinet
Transformers brand Number of
Catalogue of the supplier
Brand of the Bushings in half voltage and low voltage
Number of Catalogue of the supplier
Brand of the switch thermal either
thermomagneticNumber of Catalogue of the
supplier
Brand of the fuse holder Number
of Catalogue of the supplier

Brand of the fuses of expulsion of double element

Number of Catalogue of the supplier
Brand of the fuses limiters of current of intervalpartial
Number of Catalogue of the supplier

Failure indicator marking Number

of Catalogue of the supplier

Bidder: Representative:

Signature and date

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CHARACTERISTICS INDIVIDUALS FOR: TRANSFORMERS SINGLE PHASE TYPE
PEDESTAL UNTIL 100 kVA FOR DISTRIBUTION UNDERGROUND

Correspondent to the specification CFE K0000-04

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CHARACTERISTICS

Number of transformers required:

Description short:

Type of Transformer: Normal Warm

switch thermal either thermomagnetic in BT: YES NO

Indicator of Failure: YES NO

changing table of derivations YES NO

For the manufacturing of tank and of the cabinet select one of the combinations of material That indicate to
continuation:

CABINET TANK OPTION

1 Stainless Stainless
CPE - 327

2 Metallized Stainless

3 Metallic Metallic

Others accessories:

Others modifications:

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FE OF ERRATA

PAGE 1 OF 24

SAYS:

NMX-Z-012-2-1987 Sampling for the Inspection by Attributes – Part 2 – general

information and applications Sampling method, TABLEs and
Graphics.

NRF-002-CFE-2009 Manuals Technicians.

NRF-071-CFE-2010 Anticorrosive Protection Systems for Electrical Equipment

Installed to the Outdoor.

CFE 58100-07-1998 Terminals of Half Voltage Type Well.

CFE GCUI0-68-1995 Indicator of Failure.

HAS TO SAY:

NMX-Z-012-2-1987 Sampling for Inspection by Attributes – Part 2 - Method of

Sampling, TABLEs and Graphics.

CFE L1000-32-2015 Manuals, Procedures and Instructions Technicians.

CFE D8510-01-2016 Systems of Protection Anticorrosive for Equipment Electric

Installed to the Outdoor.

CFE 58100-07-1998 Terminals of Media Voltage Well Type. (eliminate).

CFE GCUI0-68-2015 Indicator of Failure.

PAGE eleven OF

24SAYS:

TABLE 5 - Characteristics of the fuse limiter of current

Rated Voltage NBAI Current

Transformer Fuse Interruption
effective
(kV rmc) (kV rmc) (kV) crest asymmetric(A)
13.2 / 7.62 8.3 95 25 000
22.86 / 13.2 15 125 25 000
33.0 / 1.0 23 150 50 000

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HAS TO SAY:

TABLE 5 - Characteristics of the fuse limiter of current

Rated Voltage NBAI Current

Transformer Fuse Interruption
asymmetric
(kV rmc) (kV rmc) (kV) crest effective
(TO)
13.2 / 7.62 8.3 95 25 000
22.86 / 13.2 fifteen 125 25 000
33.0 / 19.0 23 150 50 000

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