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ENGINEERING STANDARD
Number
IEC-E04-S02
Rev. No.
0
Date
Dec-2007
Page
1 of 10
Dry Type Distribution and Power Transformers (IEC)
This document is issued by Engineering Standards Section, SABIC E&PM, Jubail Industrial City, Kingdom of Saudi Arabia. The information contained in this document is the confidential property of SABIC. It cannot be disclosed, copied or used for any purpose without approval from SABIC. If you are not authorized to posses this document, please destroy it immediately.
Dry Type Distribution and Power Transformers (IEC)
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
2 of 10
TABLE OF CONTENTS
1.
Scope ........................................................................................................................... 3
2.
References .................................................................................................................. 3
3.
General ........................................................................................................................ 3
4.
Service Conditions ..................................................................................................... 5
5.
Unit Construction ....................................................................................................... 5
6.
K-Factor Rated Transformers ................................................................................... 6
7.
Ratings ........................................................................................................................ 6 7.1 7.2
Voltage ............................................................................................................. 6 Sound Levels ................................................................................................... 7
8.
Primary Basic Impulse Insulation Level (BIL) ......................................................... 7
9.
Inspection .................................................................................................................... 8
10.
Terminal Marking ........................................................................................................ 8
11.
Testing ......................................................................................................................... 8
12.
Transformer Accessories .......................................................................................... 9
13.
Shipping ...................................................................................................................... 9
Dry Type Distribution and Power Transformers (IEC)
1.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
3 of 10
Scope This specification details the design, construction, two winding transformer and testing of Dry Type Cast Resin Distribution Transformers ranging from 15 to 500 kVA of both the general purpose type and K-factor rated for non-linear loads. This document is mainly based on lEC Standards and was created by conversion and modification of the SABIC Engineering Standards (SES) that are ANSI/IEEE based.
2.
References Reference is made in this specification to the following documents. The latest issues, amendments, and supplements to these documents shall apply unless otherwise indicated. SABIC Engineering Standards (SES) IEC-E04-X02 Dry Type Cast Resin Transformers - Data Sheet International Electrotechnical Commission (IEC) IEC 60050-421
International Electrotechnical Vocabulary, Chapter 421: Power transformers and reactors
IEC 60071-1
Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60076-1
Power transformers – Part 1: General
IEC 60076-2
Power transformers – Part 2: Temperature rise
IEC 60076-3
Power transformers – Part 3: Insulation levels, dielectric tests and external clearances in air
IEC 60076-5
Power transformers – Part 5: Ability to withstand short circuit
IEC 60076-8
Power transformers – Part 8: Application guide
IEC 60076-10
Power transformers – Part 10: Determination of sound levels
IEC 60076-10-1
Power transformers – Part 10-1: Determination of sound levels – Application guide
IEC 60076-11
Power transformers – Part 11: Dry-type transformers
IEC 60173
Insulated bushings for alternating voltages above 1 000 V
IEC 60364-5-54
Electrical installation of buildings – Part 5-54: Selection and erection of electrical equipment – Earthing arrangements, protective conductors and protective bonding conductors
IEC 60529
Degrees of protection provided by enclosures (IP Code)
IEC/TR 60616
Terminal and tapping markings for power transformers
IEC 60905
Loading guide for dry-type transformers
American National Standards Association / Institute for Electrical and Electronics Engineers (ANSI/IEEE) C57.110 Establishing Transformer Capability When Supplying Non-sinusoidal Load Currents
3.
General 3.1
See IEC 60050-421 and IEC 60076-1 for definitions of and general requirements.
3.2
Cast coil transformers are preferred to conventional dry type transformers when using in adverse environmental conditions.
Dry Type Distribution and Power Transformers (IEC)
3.3
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
4 of 10
Unless otherwise noted, these units shall be utilized with a primary supply voltage not to exceed 34.5 kV, 60 Hz, single or three phase and shall be self-cooled. Data sheet SES IEC-E04-X02 shall be completed by all parties as required for each transformer and submitted as part of the final documentation.
Dry Type Distribution and Power Transformers (IEC)
3.4
4.
5.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
5 of 10
Any conflict(s) between this specification, SES and industry standards, engineering drawings, and contract documents shall be resolved at the discretion of SABIC. When resolving any conflict, the following order of precedence shall apply: a.
Purchase Order
b.
Data Sheet
c.
Referenced Document(s)
Service Conditions 4.1
Transformers shall be designed to operate continuously and intermittently.
4.2
Transformers for outdoor applications shall be designed to operate outdoors in an atmosphere typical of industrial facilities including petrochemical plants. Plants may be located in coastal and desert areas with fine blown dust conditions.
4.3
Transformers shall be designed to operate in an ambient temperature of 1 to 50 °C.
4.4
Design temperature of the ambient air for any 24 hour period shall be 50 °C and metallic surface temperature due to solar radiation shall be 90 °C.
4.5
Transformers shall be able to be energized without damage at maximum and minimum ambient temperatures as specified in 4.3.
4.6
Maximum design altitude shall be below 1000 meters, unless otherwise shown on data sheets.
4.7
Relative humidity is 1 to 95 percent non-condensing.
4.8
Seismic conditions, UBC Zone 1, unless otherwise shown on data sheet SES IEC-E04X02.
Unit Construction 5.1
Transformers shall conform to IEC 60076-11 and rated from 15 kVA to 500 kVA.
5.2
Transformers for indoor use shall be ventilated dry type with a 220 °C insulation system. The insulation levels and dielectric capabilities shall be in accordance with IEC 60076-3 and IEC 60076-11 section 12.
5.3
Transformers for outdoor use in both classified and unclassified areas shall be nonventilated up to the limits available from the manufacturer. Above this limit they shall be ventilated and protected from the environment with weather shield kits.
5.4
Units shall be designed to operate with a rated maximum temperature rise of 150 °C.
5.5
Unless otherwise specified, electrical conductor shall be made of electrolytic copper, with conductivity 98% IACS and arranged to brace coil layers and provide maximum ventilation. Aluminum windings shall be provided with conductivity 61% IACS, if specified on data sheets, SES IEC-E04-X02.
5.6
Core laminations shall be tightly assembled. The complete core and coil assembly shall be vacuum impregnated with a non-hygroscopic thermo-setting varnish.
5.7
Core and coil assemblies shall be constructed to provide thermal, mechanical and magnetic short circuit withstand capabilities.
5.8
The core and coil assembly shall be installed on vibration dampening pads and securely bolted to the enclosure base.
5.9
Grounding shall be in accordance with IEC 60076-11 section 32 and IEC 60364-5-54.
5.10
On neutral grounded wye system, the neutral shall be grounded at the supply transformer neutral bushing.
5.11
The enclosure shall be of heavy gauge steel construction, with removable front and rear covers to provide access to the terminal compartments.
Dry Type Distribution and Power Transformers (IEC)
6.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
6 of 10
5.12
Unless otherwise specified, finish coat shall have a nonmetallic pigment surface. Color of finish coat shall be light gray RAL 7035 in accordance to RAL Institute – Basic Collection RAL 840-HR / RAL 841-GL and covered with an epoxy coat for protection against environmental conditions.
5.13
Terminals shall be sized to carry 125 percent of the transformers full load current. Transformers above 600 V shall have two separate terminal compartments for high voltage and low voltage terminals.
5.14
Transformers shall be approved for use in the zone classification they are to be installed in. The majority of these transformers will probably be located in Group II, Zone 2 areas. Wherever possible they shall be installed in unclassified areas.
5.15
Units installed outdoors shall have a IP55 outdoor enclosure.
5.16
The enclosure shall be mechanically isolated from the transformer.
5.17
Corrosion resistant wall mounting brackets and fasteners shall be installed where specified.
K-Factor Rated Transformers 6.1
When transformers are to serve non-linear loads they shall be K-Factor rated.
6.2
The K-Factor is the ratio between the additional losses due to harmonics and the eddy current losses at 60 Hz.
6.3
Non-linear rated transformers shall be suitable for non-sinusoidal loads and harmonic distortion as required in ANSI/IEEE C57.110.
6.4
Non-linear rated transformers shall be UL listed and shall bear the UL marking on its nameplate along with the specific K-Factor rating or equal.
6.5
The transformers shall be designed with and labeled for one of the following K-Factor rating designations: K4 for 50 percent non-linear load K13 for 100 percent non-linear load K20 for 150 percent non-linear load K30 for 200 percent non-linear load
7.
6.6
The core of K-Factor rated transformers shall be designed to withstand voltage distortion and high frequency harmonic currents.
6.7
The core shall be magnetic flux density.
6.8
Primary and secondary windings shall be designed to minimize stray losses, skin effect losses and excessive heating from harmonic currents.
6.9
Coils shall not exceed the specified winding temperature rise, the corresponding hot spot temperature rating or the 220 °C insulation rating while carrying the specified nonlinear load.
6.10
The neutral bus for single phase, 3 wire or 3 phase, 4 wire shall be sized for 200 percent of rated current.
6.11
An electrostatic shield shall be provided between the primary and secondary windings and grounded to a common point within the transformer enclosure.
6.12
K-Factor rating is not described in the IEC. General information for measurement and calculation of transformer losses are given in IEC 60076-1 and IEC 60076-8.
Ratings 7.1
Voltage 7.1.1
All transformers shall be 3 phase delta primary and wye secondary dry type cast resin and suitable for indoor and outdoor operation.
Dry Type Distribution and Power Transformers (IEC)
7.1.2
7.1.3
7.2
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
7 of 10
Unless otherwise specified on data sheets standard voltage ratings shall be supplied. The primary voltage shall not exceed 34.5 kV, with secondary voltage to be one of the following: a.
120 V, 240 V single phase 3 wire
b.
208 Y / 120 V three phase 4 wire
c.
480 Y / 277 V three phase 4 wire
Unless otherwise specified, four full-capacity, off-load taps, two 21/2 percent above nominal and two 21/2 percent below nominal shall be provided on the high voltage winding.
Sound Levels
Unless otherwise specified, transformer sound levels shall conform to IEC 60076-10 and IEC 60076-10-1 as follows:
8.
10 to 50 kVA
45 dB
51 to 150 kVA
50 dB
151 to 300 kVA
55 dB
301 to 500 kVA
60 dB
Primary Basic Impulse Insulation Level (BIL) Transformer Winding Insulation levels shall not be less than defined in IEC 60076-3, Table 2: Table I – Selected rated withstand voltages for transformer windings Highest voltage for Equipment Um
Rated lightning impulse withstand voltage
Rated short duration induced or separate source AC withstand voltage
kV r.m.s.
kV peak
kV r.m.s.
3.6
40
10
7.2
60
20
17.5
95
38
36
170
70
Dry Type Distribution and Power Transformers (IEC)
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
8 of 10
Bushing Insulation levels shall not be less than defined in IEC 60137, Table 7: Table II – Selected bushing insulation levels
9.
10.
Highest voltage for Equipment Um
Dry lightning impulse withstand voltage (BIL)
Power-frequency withstand voltage, wet and dry
kV r.m.s.
kV (peak value)
3.6
40
10
7.2
60
20
17.5
95
38
36
170
70
kV (r.m.s. value)
Inspection 9.1
Vendor shall have a quality control program which will be monitored by SABIC. Vendor shall also be responsible for quality control of all the work done by a subcontractor.
9.2
Inspection procedures and reviews shall be defined by specific project requirements, which are part of the purchase order.
9.3
Inspection will be at the discretion of SABIC.
9.4
When specified, vendor shall arrange for an inspection by SABIC.
9.5
The vendor shall provide to SABIC, at the time of inspection, a complete set of the approved drawings of the equipment, quality control procedures and results of tests carried out on the transformers in accordance with the purchase order.
9.6
When major components or services are obtained from sub-suppliers, SABIC representative shall be notified and given the option of inspection at the point of manufacture.
9.7
It is the responsibility of the prime supplier to include SABIC inspection requirements in suborders and to arrange for approval drawings of the equipment to be available to SABIC during inspections at the sub-supplier’s location.
9.8
Additional inspections of equipment by SABIC do not relieve the supplier or subsupplier of the responsibility for meeting the requirements of the specification.
9.9
SABIC approval and release shall be required prior to shipment.
Terminal Marking Terminal designations shall be as defined by IEC/TR 60616 with each terminal clearly marked with oil resistant yellow paint. The identification of terminal connections shall be shown on the instruction nameplate.
11.
Testing 11.1
Transformers shall be tested in accordance with IEC 60076-11 and IEC 60076-1 and applicable industry standards. Unless otherwise specified, the following tests shall be required. Prior to shipping, SABIC shall receive certified copies of the test results. (a)
Ratio: Rated voltage and all taps
(b)
Excitation loss at rated voltage and nameplate connection
Dry Type Distribution and Power Transformers (IEC)
12.
13.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
9 of 10
(c)
Resistance: On all windings and at all tap positions
(d)
Polarity and phase relations
(e)
Excitation current at rated voltage and at nameplate connection
(f)
Load loss and impedance corrected to nameplate connected rated voltage and rated temperature rise, at 50 °C ambient and rated kVA
(g)
Sound level testing
(h)
Temperature rise of each winding
(i)
Dielectric: Applied potential, at power frequency, for each winding to all other windings, the core and the enclosure or frame
(j)
Dielectric: Induced potential
(k)
Dielectric: Partial discharge, coils less than 1.2 kV
(l)
Dielectric: Impulse
(m)
Insulation Resistance: Each winding to ground and from winding to winding using a megger type tester, or as required
(n)
Short circuit
(o)
Full load and impartial
Transformer Accessories 12.1
Each transformer shall be equipped with all vendor’s normally furnished standard accessories.
12.2
If surge arresters are specified on data sheet, they shall be mounted to allow for ready disconnection (without removal) to permit independent testing of transformer and arresters.
12.3
Unless otherwise specified on data sheet, 3 phase hot spot temperature indicators shall be provided on transformers 300 kVA and 500 kVA.
Shipping 13.1
Vendor shall submit a description of preparation for shipping for SABIC approval. Vendor shall be responsible for the preparation for shipment and ensuring that the transformer reaches SABIC destination in satisfactory condition.
13.2
Nameplates shall be made of stainless steel securely fastened at eye level height to the front of the transformer enclosure with stainless steel screws and shall conform to IEC 60076-11, section 9.1. As a minimum the nameplate shall include the following:
13.3
a.
Complete electrical data
b.
Wiring Diagram
c.
Tap Connections
d.
Manufacturer's Name
e.
Catalog Number
f.
Mfg. Serial No.
g.
Date of Manufacture
h.
Impedance
i.
Weight
j.
Ambient Temperature
k.
Vector Group
Document requirements shall be listed in the purchase specification.
Dry Type Distribution and Power Transformers (IEC)
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
10 of 10
13.4
The purchase order number and the equipment item number shall be included on all equipment drawings.
13.5
Certified outline drawings for the transformer and enclosure shall include: (i)
Size and location of the connecting points
(ii)
Overall dimensions, arrangement and location of magnetic insulating materials
(iii)
Equipment weights and any special foundation or mounting requirements
(iv)
Spacing and clearance requirements in all planes
(v)
Terminal box L.V. and H.V. details
13.6
Overall price, descriptive information, drawing and delivery schedule shall be included on the procurement documents.
13.7
Installation, maintenance and operating instructions shall be included and shipped with the transformer.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec-2007
Page
1 of 10
Dry Type Distribution and Power Transformers (IEC)
This document is issued by Engineering Standards Section, SABIC E&PM, Jubail Industrial City, Kingdom of Saudi Arabia. The information contained in this document is the confidential property of SABIC. It cannot be disclosed, copied or used for any purpose without approval from SABIC. If you are not authorized to posses this document, please destroy it immediately.
Dry Type Distribution and Power Transformers (IEC)
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
2 of 10
TABLE OF CONTENTS
1.
Scope ........................................................................................................................... 3
2.
References .................................................................................................................. 3
3.
General ........................................................................................................................ 3
4.
Service Conditions ..................................................................................................... 5
5.
Unit Construction ....................................................................................................... 5
6.
K-Factor Rated Transformers ................................................................................... 6
7.
Ratings ........................................................................................................................ 6 7.1 7.2
Voltage ............................................................................................................. 6 Sound Levels ................................................................................................... 7
8.
Primary Basic Impulse Insulation Level (BIL) ......................................................... 7
9.
Inspection .................................................................................................................... 8
10.
Terminal Marking ........................................................................................................ 8
11.
Testing ......................................................................................................................... 8
12.
Transformer Accessories .......................................................................................... 9
13.
Shipping ...................................................................................................................... 9
Dry Type Distribution and Power Transformers (IEC)
1.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
3 of 10
Scope This specification details the design, construction, two winding transformer and testing of Dry Type Cast Resin Distribution Transformers ranging from 15 to 500 kVA of both the general purpose type and K-factor rated for non-linear loads. This document is mainly based on lEC Standards and was created by conversion and modification of the SABIC Engineering Standards (SES) that are ANSI/IEEE based.
2.
References Reference is made in this specification to the following documents. The latest issues, amendments, and supplements to these documents shall apply unless otherwise indicated. SABIC Engineering Standards (SES) IEC-E04-X02 Dry Type Cast Resin Transformers - Data Sheet International Electrotechnical Commission (IEC) IEC 60050-421
International Electrotechnical Vocabulary, Chapter 421: Power transformers and reactors
IEC 60071-1
Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60076-1
Power transformers – Part 1: General
IEC 60076-2
Power transformers – Part 2: Temperature rise
IEC 60076-3
Power transformers – Part 3: Insulation levels, dielectric tests and external clearances in air
IEC 60076-5
Power transformers – Part 5: Ability to withstand short circuit
IEC 60076-8
Power transformers – Part 8: Application guide
IEC 60076-10
Power transformers – Part 10: Determination of sound levels
IEC 60076-10-1
Power transformers – Part 10-1: Determination of sound levels – Application guide
IEC 60076-11
Power transformers – Part 11: Dry-type transformers
IEC 60173
Insulated bushings for alternating voltages above 1 000 V
IEC 60364-5-54
Electrical installation of buildings – Part 5-54: Selection and erection of electrical equipment – Earthing arrangements, protective conductors and protective bonding conductors
IEC 60529
Degrees of protection provided by enclosures (IP Code)
IEC/TR 60616
Terminal and tapping markings for power transformers
IEC 60905
Loading guide for dry-type transformers
American National Standards Association / Institute for Electrical and Electronics Engineers (ANSI/IEEE) C57.110 Establishing Transformer Capability When Supplying Non-sinusoidal Load Currents
3.
General 3.1
See IEC 60050-421 and IEC 60076-1 for definitions of and general requirements.
3.2
Cast coil transformers are preferred to conventional dry type transformers when using in adverse environmental conditions.
Dry Type Distribution and Power Transformers (IEC)
3.3
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
4 of 10
Unless otherwise noted, these units shall be utilized with a primary supply voltage not to exceed 34.5 kV, 60 Hz, single or three phase and shall be self-cooled. Data sheet SES IEC-E04-X02 shall be completed by all parties as required for each transformer and submitted as part of the final documentation.
Dry Type Distribution and Power Transformers (IEC)
3.4
4.
5.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
5 of 10
Any conflict(s) between this specification, SES and industry standards, engineering drawings, and contract documents shall be resolved at the discretion of SABIC. When resolving any conflict, the following order of precedence shall apply: a.
Purchase Order
b.
Data Sheet
c.
Referenced Document(s)
Service Conditions 4.1
Transformers shall be designed to operate continuously and intermittently.
4.2
Transformers for outdoor applications shall be designed to operate outdoors in an atmosphere typical of industrial facilities including petrochemical plants. Plants may be located in coastal and desert areas with fine blown dust conditions.
4.3
Transformers shall be designed to operate in an ambient temperature of 1 to 50 °C.
4.4
Design temperature of the ambient air for any 24 hour period shall be 50 °C and metallic surface temperature due to solar radiation shall be 90 °C.
4.5
Transformers shall be able to be energized without damage at maximum and minimum ambient temperatures as specified in 4.3.
4.6
Maximum design altitude shall be below 1000 meters, unless otherwise shown on data sheets.
4.7
Relative humidity is 1 to 95 percent non-condensing.
4.8
Seismic conditions, UBC Zone 1, unless otherwise shown on data sheet SES IEC-E04X02.
Unit Construction 5.1
Transformers shall conform to IEC 60076-11 and rated from 15 kVA to 500 kVA.
5.2
Transformers for indoor use shall be ventilated dry type with a 220 °C insulation system. The insulation levels and dielectric capabilities shall be in accordance with IEC 60076-3 and IEC 60076-11 section 12.
5.3
Transformers for outdoor use in both classified and unclassified areas shall be nonventilated up to the limits available from the manufacturer. Above this limit they shall be ventilated and protected from the environment with weather shield kits.
5.4
Units shall be designed to operate with a rated maximum temperature rise of 150 °C.
5.5
Unless otherwise specified, electrical conductor shall be made of electrolytic copper, with conductivity 98% IACS and arranged to brace coil layers and provide maximum ventilation. Aluminum windings shall be provided with conductivity 61% IACS, if specified on data sheets, SES IEC-E04-X02.
5.6
Core laminations shall be tightly assembled. The complete core and coil assembly shall be vacuum impregnated with a non-hygroscopic thermo-setting varnish.
5.7
Core and coil assemblies shall be constructed to provide thermal, mechanical and magnetic short circuit withstand capabilities.
5.8
The core and coil assembly shall be installed on vibration dampening pads and securely bolted to the enclosure base.
5.9
Grounding shall be in accordance with IEC 60076-11 section 32 and IEC 60364-5-54.
5.10
On neutral grounded wye system, the neutral shall be grounded at the supply transformer neutral bushing.
5.11
The enclosure shall be of heavy gauge steel construction, with removable front and rear covers to provide access to the terminal compartments.
Dry Type Distribution and Power Transformers (IEC)
6.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
6 of 10
5.12
Unless otherwise specified, finish coat shall have a nonmetallic pigment surface. Color of finish coat shall be light gray RAL 7035 in accordance to RAL Institute – Basic Collection RAL 840-HR / RAL 841-GL and covered with an epoxy coat for protection against environmental conditions.
5.13
Terminals shall be sized to carry 125 percent of the transformers full load current. Transformers above 600 V shall have two separate terminal compartments for high voltage and low voltage terminals.
5.14
Transformers shall be approved for use in the zone classification they are to be installed in. The majority of these transformers will probably be located in Group II, Zone 2 areas. Wherever possible they shall be installed in unclassified areas.
5.15
Units installed outdoors shall have a IP55 outdoor enclosure.
5.16
The enclosure shall be mechanically isolated from the transformer.
5.17
Corrosion resistant wall mounting brackets and fasteners shall be installed where specified.
K-Factor Rated Transformers 6.1
When transformers are to serve non-linear loads they shall be K-Factor rated.
6.2
The K-Factor is the ratio between the additional losses due to harmonics and the eddy current losses at 60 Hz.
6.3
Non-linear rated transformers shall be suitable for non-sinusoidal loads and harmonic distortion as required in ANSI/IEEE C57.110.
6.4
Non-linear rated transformers shall be UL listed and shall bear the UL marking on its nameplate along with the specific K-Factor rating or equal.
6.5
The transformers shall be designed with and labeled for one of the following K-Factor rating designations: K4 for 50 percent non-linear load K13 for 100 percent non-linear load K20 for 150 percent non-linear load K30 for 200 percent non-linear load
7.
6.6
The core of K-Factor rated transformers shall be designed to withstand voltage distortion and high frequency harmonic currents.
6.7
The core shall be magnetic flux density.
6.8
Primary and secondary windings shall be designed to minimize stray losses, skin effect losses and excessive heating from harmonic currents.
6.9
Coils shall not exceed the specified winding temperature rise, the corresponding hot spot temperature rating or the 220 °C insulation rating while carrying the specified nonlinear load.
6.10
The neutral bus for single phase, 3 wire or 3 phase, 4 wire shall be sized for 200 percent of rated current.
6.11
An electrostatic shield shall be provided between the primary and secondary windings and grounded to a common point within the transformer enclosure.
6.12
K-Factor rating is not described in the IEC. General information for measurement and calculation of transformer losses are given in IEC 60076-1 and IEC 60076-8.
Ratings 7.1
Voltage 7.1.1
All transformers shall be 3 phase delta primary and wye secondary dry type cast resin and suitable for indoor and outdoor operation.
Dry Type Distribution and Power Transformers (IEC)
7.1.2
7.1.3
7.2
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
7 of 10
Unless otherwise specified on data sheets standard voltage ratings shall be supplied. The primary voltage shall not exceed 34.5 kV, with secondary voltage to be one of the following: a.
120 V, 240 V single phase 3 wire
b.
208 Y / 120 V three phase 4 wire
c.
480 Y / 277 V three phase 4 wire
Unless otherwise specified, four full-capacity, off-load taps, two 21/2 percent above nominal and two 21/2 percent below nominal shall be provided on the high voltage winding.
Sound Levels
Unless otherwise specified, transformer sound levels shall conform to IEC 60076-10 and IEC 60076-10-1 as follows:
8.
10 to 50 kVA
45 dB
51 to 150 kVA
50 dB
151 to 300 kVA
55 dB
301 to 500 kVA
60 dB
Primary Basic Impulse Insulation Level (BIL) Transformer Winding Insulation levels shall not be less than defined in IEC 60076-3, Table 2: Table I – Selected rated withstand voltages for transformer windings Highest voltage for Equipment Um
Rated lightning impulse withstand voltage
Rated short duration induced or separate source AC withstand voltage
kV r.m.s.
kV peak
kV r.m.s.
3.6
40
10
7.2
60
20
17.5
95
38
36
170
70
Dry Type Distribution and Power Transformers (IEC)
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
8 of 10
Bushing Insulation levels shall not be less than defined in IEC 60137, Table 7: Table II – Selected bushing insulation levels
9.
10.
Highest voltage for Equipment Um
Dry lightning impulse withstand voltage (BIL)
Power-frequency withstand voltage, wet and dry
kV r.m.s.
kV (peak value)
3.6
40
10
7.2
60
20
17.5
95
38
36
170
70
kV (r.m.s. value)
Inspection 9.1
Vendor shall have a quality control program which will be monitored by SABIC. Vendor shall also be responsible for quality control of all the work done by a subcontractor.
9.2
Inspection procedures and reviews shall be defined by specific project requirements, which are part of the purchase order.
9.3
Inspection will be at the discretion of SABIC.
9.4
When specified, vendor shall arrange for an inspection by SABIC.
9.5
The vendor shall provide to SABIC, at the time of inspection, a complete set of the approved drawings of the equipment, quality control procedures and results of tests carried out on the transformers in accordance with the purchase order.
9.6
When major components or services are obtained from sub-suppliers, SABIC representative shall be notified and given the option of inspection at the point of manufacture.
9.7
It is the responsibility of the prime supplier to include SABIC inspection requirements in suborders and to arrange for approval drawings of the equipment to be available to SABIC during inspections at the sub-supplier’s location.
9.8
Additional inspections of equipment by SABIC do not relieve the supplier or subsupplier of the responsibility for meeting the requirements of the specification.
9.9
SABIC approval and release shall be required prior to shipment.
Terminal Marking Terminal designations shall be as defined by IEC/TR 60616 with each terminal clearly marked with oil resistant yellow paint. The identification of terminal connections shall be shown on the instruction nameplate.
11.
Testing 11.1
Transformers shall be tested in accordance with IEC 60076-11 and IEC 60076-1 and applicable industry standards. Unless otherwise specified, the following tests shall be required. Prior to shipping, SABIC shall receive certified copies of the test results. (a)
Ratio: Rated voltage and all taps
(b)
Excitation loss at rated voltage and nameplate connection
Dry Type Distribution and Power Transformers (IEC)
12.
13.
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
9 of 10
(c)
Resistance: On all windings and at all tap positions
(d)
Polarity and phase relations
(e)
Excitation current at rated voltage and at nameplate connection
(f)
Load loss and impedance corrected to nameplate connected rated voltage and rated temperature rise, at 50 °C ambient and rated kVA
(g)
Sound level testing
(h)
Temperature rise of each winding
(i)
Dielectric: Applied potential, at power frequency, for each winding to all other windings, the core and the enclosure or frame
(j)
Dielectric: Induced potential
(k)
Dielectric: Partial discharge, coils less than 1.2 kV
(l)
Dielectric: Impulse
(m)
Insulation Resistance: Each winding to ground and from winding to winding using a megger type tester, or as required
(n)
Short circuit
(o)
Full load and impartial
Transformer Accessories 12.1
Each transformer shall be equipped with all vendor’s normally furnished standard accessories.
12.2
If surge arresters are specified on data sheet, they shall be mounted to allow for ready disconnection (without removal) to permit independent testing of transformer and arresters.
12.3
Unless otherwise specified on data sheet, 3 phase hot spot temperature indicators shall be provided on transformers 300 kVA and 500 kVA.
Shipping 13.1
Vendor shall submit a description of preparation for shipping for SABIC approval. Vendor shall be responsible for the preparation for shipment and ensuring that the transformer reaches SABIC destination in satisfactory condition.
13.2
Nameplates shall be made of stainless steel securely fastened at eye level height to the front of the transformer enclosure with stainless steel screws and shall conform to IEC 60076-11, section 9.1. As a minimum the nameplate shall include the following:
13.3
a.
Complete electrical data
b.
Wiring Diagram
c.
Tap Connections
d.
Manufacturer's Name
e.
Catalog Number
f.
Mfg. Serial No.
g.
Date of Manufacture
h.
Impedance
i.
Weight
j.
Ambient Temperature
k.
Vector Group
Document requirements shall be listed in the purchase specification.
Dry Type Distribution and Power Transformers (IEC)
Number
IEC-E04-S02
Rev. No.
0
Date
Dec- 2007
Page
10 of 10
13.4
The purchase order number and the equipment item number shall be included on all equipment drawings.
13.5
Certified outline drawings for the transformer and enclosure shall include: (i)
Size and location of the connecting points
(ii)
Overall dimensions, arrangement and location of magnetic insulating materials
(iii)
Equipment weights and any special foundation or mounting requirements
(iv)
Spacing and clearance requirements in all planes
(v)
Terminal box L.V. and H.V. details
13.6
Overall price, descriptive information, drawing and delivery schedule shall be included on the procurement documents.
13.7
Installation, maintenance and operating instructions shall be included and shipped with the transformer.
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