self-protected voltage transformers 24 kv - u 36 kv rev 02... · global standard page 1 of 20...

GLOBAL STANDARD of 20

SELF-PROTECTED VOLTAGE TRANSFORMERS Um 24 kV - Um 36 kV

GSCT003 Rev. 02

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This document is intellectual property of Enel SpA; reproduction or distribution of its contents in any way or by any means whatsoever is subject to the prior approval of the above mentioned company which will safeguard its rights under the civil and penal codes.

Countries’ I&N Elaborated by

Argentina E. Klimenko

Brazil V. Robadey

Chile H. Herrera

Colombia L. Vargas

Iberia C. Conesa

Italy G. Dominici

Peru J. Taboada

Romania O. Vasilica

Elaborated by Verified by Approved by

Solution Development Center G. Dominici F. Mauri I. Gentilini

Global I&N – NT/NCS - N. Cammalleri G. Egea Brufau F. Giammanco

Revision Data List of modifications

02 25/11/2016

4.3 Added particular local seismic requirements – 3 Updated DSOs names - 5 Added elongation at break according to ISO/R527 between 20-50% - 7.2.2 Updated voltage level for SVT partial discharge type test 7.2.9 Added verification of local seismic requirements type test by analytic demonstration - 7.3.3 Updated voltage level for SVT partial discharge routine test - 7.4.1 Improved description of the accelerate environmental electric ageing test

01 15/03/2016 Updated list of Country codes; Updated list of routine tests 00 14/01/2016 First emission



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INDEX

1 SCOPE ......................................................................................................................................................................................... 4

2 APPLICATION .......................................................................................................................................................................... 4

3 LIST OF COMPONENTS ......................................................................................................................................................... 4

4 REFERENCE LAW AND STANDARDS ................................................................................................................................ 5

4.1 Laws .................................................................................................................................................................... 5 4.1.1 Argentina ........................................................................................................................................................... 5 4.1.2 Brazil .................................................................................................................................................................. 5 4.1.3 Chile .................................................................................................................................................................. 5 4.1.4 Colombia ........................................................................................................................................................... 5 4.1.5 Italy.................................................................................................................................................................... 5 4.1.6 Perú ................................................................................................................................................................... 5 4.1.7 Romania ............................................................................................................................................................ 5 4.1.8 Spain .................................................................................................................................................................. 5

4.2 Standards ............................................................................................................................................................ 5 4.2.1 Common international standards ..................................................................................................................... 5

4.3 Particular local seismic requirements .................................................................................................................. 6 4.3.1 Chile .................................................................................................................................................................. 6 4.3.2 Colombia ........................................................................................................................................................... 6 4.3.3 Peru ................................................................................................................................................................... 6 4.3.4 Romania ............................................................................................................................................................ 6

5 MAIN CARACTERISTICS ....................................................................................................................................................... 7

6 DESIGN AND CONSTRUCTION REQUIREMENTS .......................................................................................................... 8

6.1 Generality ........................................................................................................................................................... 8

6.2 Primary terminals ............................................................................................................................................... 8

6.3 Secondary terminals ........................................................................................................................................... 8

6.4 Fuses ................................................................................................................................................................... 9

6.5 Voltage Transformer ......................................................................................................................................... 10

6.6 High Voltage connections .................................................................................................................................. 11

6.7 Low Voltage cabling .......................................................................................................................................... 11

6.8 Metal enclosure ................................................................................................................................................ 11

6.9 Internal insulation ............................................................................................................................................. 11

6.10 Rating plate ....................................................................................................................................................... 11

6.11 Marking of primary terminals ........................................................................................................................... 11

6.12 Marking of secondary terminals ........................................................................................................................ 11

6.13 SVT electric scheme........................................................................................................................................... 12 6.13.1 GSCT003/1 – GSCT003/2 – Um 24 kV .......................................................................................................... 12 6.13.2 GSCT003/3 – Um 36 kV................................................................................................................................ 12



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6.14 Bracket .............................................................................................................................................................. 13

6.14.1 Chile ............................................................................................................................................................ 13 6.14.2 Italy ............................................................................................................................................................. 13 6.14.3 Romania ..................................................................................................................................................... 13

6.15 Manual and packaging ...................................................................................................................................... 14

7 LIST OF TESTS .......................................................................................................................................................................14

7.1 General ............................................................................................................................................................. 14

7.2 Type test ........................................................................................................................................................... 14 7.2.1 Visual inspection ............................................................................................................................................. 14 7.2.2 Partial discharge test ....................................................................................................................................... 14 7.2.3 Verification of the degree of protection (IP) ................................................................................................. 15 7.2.4 Temperature rise test ..................................................................................................................................... 15 7.2.5 Impulse voltage withstand test on primary terminals .................................................................................... 15 7.2.6 Wet test for outdoor type transformers ......................................................................................................... 15 7.2.7 Test for accuracy ............................................................................................................................................. 15 7.2.8 Short-circuit withstand capability test ............................................................................................................ 15 7.2.9 Verification of local seismic requirements ...................................................................................................... 15

7.3 Routine tests ..................................................................................................................................................... 15 7.3.1 Power-frequency voltage withstand tests on primary terminals ................................................................... 15 7.3.2 Partial discharge measurement ...................................................................................................................... 15 7.3.3 Partial discharge test ....................................................................................................................................... 15 7.3.4 Power-frequency voltage withstand tests on secondary terminals ................................................................ 15 7.3.5 Test for accuracy ............................................................................................................................................. 15 7.3.6 Verification of markings .................................................................................................................................. 15

7.4 Special tests ...................................................................................................................................................... 16 7.4.1 Accelerated environmental-electric aging test ............................................................................................... 16 7.4.2 Internal arc fault test....................................................................................................................................... 16

8 ADDITIONAL INFORMATION ...........................................................................................................................................17

8.1 Connector system ............................................................................................................................................. 17

8.2 Example of SVT (Self-protected Volatge Transformer) ...................................................................................... 18

8.3 Gronded connection of the SVT......................................................................................................................... 18

9 DOCUMENTATION FOR THE HOMOLOGATION PROCESS .....................................................................................19

9.1 Documentation of individual components of the SVT ....................................................................................... 19

9.2 Documentation of the complete SVT ................................................................................................................ 19

9.3 Documentation referring to the tests performed on the prototype of SVT assembly ....................................... 19

10 MAXIMUM DIMENSIONS AND LAYOUT ........................................................................................................................20

10.1 SELF-PROTECTED VOLTAGE TRANSFORMER 24 KV (GSCT003/1-2)..................................................................... 20

10.2 SELF-PROTECTED VOLTAGE TRANSFORMER 36KV (GSCT003/3) ........................................................................ 20



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1 SCOPE

This document prescribes the technical characteristics, performance and testing methods for Self-protected Voltage Transformers (SVT) to be used in the distribution network up to 36 kV of the Enel Group Distribution Companies whose Countries are listed below:

� Argentina � Brazil � Chile � Colombia � Iberia � Italy � Peru � Romania

2 APPLICATION

This document applies to equipment SVT (Self-protected Voltage Transformer) used as power supply of the auxiliary services for the remote control in the Enel Group distribution networks up to 36 kV, with short current circuit up to 16 kA in systems with isolated neutral, resonant neutral and solidly or impedence earthed neutral.

3 LIST OF COMPONENTS

The SVT can be used in Enel Group distribution network up to 36 kV according to following correlation table, between voltage level of country distribution network and primary level voltages of the global type SVTs.

GLOBAL TYPE GSCT003/1 GSCT003/2 GSCT003/3

SVT Primary Voltage Level (kV) 20-15-13,2-10 13,8-13,2-12-11,4 33-25-23

COUNTRIES DISTRIBUTION COMPANY COUNTRY CODE

ARGENTINA EDESUR 0102-1902 0102-1903

BRAZIL ENEL DISTRIBUIÇÃO RIO 6812214 6812215

ENEL DISTRIBUIÇÃO CEARÁ 6812217

CHILE CHILECTRA - - -

COLOMBIA CODENSA 6812342 6812343 6812344

IBERIA ENDESA DISTRIBUCION ELECTRICA 6711582 6711583

ITALY E-DISTRIBUZIONE 53 45 13 53 45 15

PERU EDELNOR 6812369

ROMANIA

ENEL DISTRIBUTIE BANAT 53 45 13

ENEL DISTRIBUTIE DOBROGEA 53 45 13

ENEL DISTRIBUTIE MUNTENIA 53 45 13



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4 REFERENCE LAW AND STANDARDS

4.1 Laws

4.1.1 Argentina

4.1.2 Brazil

NR-10 - segurança em instalações e serviços em eletricidade.

4.1.3 Chile

NSEG 5. E.n.71 - Reglamento de Instalaciones Eléctricas de Corrientes Fuertes.

4.1.4 Colombia

RETIE - Reglamento Técnico de Instalaciones Eléctricas. Ley 400 de 1997 - Reglamento Colombiano de Normas sismo-resistentes.

4.1.5 Italy

D.Lgs n. 81 of the 9th of April 2008 and subsequent modifications.

4.1.6 Perú

Código Nacional de Electricidad Suministro.

4.1.7 Romania

Legea securităţii şi sănătăţii în muncă nr.319/2006, cu modificările şi completările ulterioare.

4.1.8 Spain

R.D. 614/2001, de 8 de junio, sobre disposiciones mínimas para la protección de la salud y seguridad de los trabajadores frente al riesgo eléctrico. R.D. 337/2014, de 9 de mayo, por el que se aprueban el Reglamento sobre condiciones técnicas y garantías de seguridad en instalaciones eléctricas de alta tensión y sus Instrucciones Técnicas Complementarias ITC-RAT 01 a 23. R.D. 223/2008, de 15 de febrero, por el que se aprueban el Reglamento sobre condiciones técnicas y garantías de seguridad en líneas eléctricas de alta tensión y sus instrucciones técnicas complementarias ITC-LAT 01 a 09.

4.2 Standards

4.2.1 Common international standards

The below listed reference documents shall be intended in the in-force edition at the contract date (amendments included). Unless otherwise specified, these documents are valid until the new editions replace them.

Standard Edition Standard Edition

IEC 61869-1 2010-07 IEC 60529 + AMD1 + AMD2 1989 + 1999 + 2013 IEC 61869-3 2012-07 IEC TS 60815 2008 IEC 60282-1 2009-10 IEC 60332-1-1 + AMD1 2004 + 2015 EN 50181 2011-11 IEC 60332-1-2 + AMD1 2004 + 2015 IEC 62271-200 2005-11

IEC1109 1995-04



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4.3 Particular local seismic requirements

4.3.1 Chile

� ETGI-1020 - Especificaciones técnicas generals – Requisitos de diseno sismico para equipo elèctrico � DMAD-0184 - Poste de hormigòn armado 13,5 m.

4.3.2 Colombia

� NSR – 10 - Norma Sismo Resistente Colombiana

4.3.3 Peru

� E-SE-010 - Accion sismica en equipos electricos y mecánicos

4.3.4 Romania

� P100-1 2006 – Code de proiectare seismicà



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5 MAIN CARACTERISTICS

GLOBAL TYPE GSCT003/1 GSCT003/2 GSCT003/3

Rated transformation ratio (kV/kV) 20-15-13,2-10 13,8-13,2-12-11,4 33-25-23

0,1 0,1 0,1

Insulation level (kV) 24/50/125 36/70/170

Rated Frequency (Hz) 50 - 60 *

Rated power / Class / Thermal power 400 VA / 3 / 800 VA

Voltage Factor 1,2 Continuos

Type of installation Outdoor according to IEC 61869-1/3

Degree of protection (IEC 60529) IP 65

Type of internal insulation Synthetic poliuretanic resin or equivalent solid insulation (*)

Insulating Thermal class B

Primary Terminals Plug-in outside cone type according to EN 50181

Type A - 250 A Type B - 400 A

Maximum overall dimensions (mm) 450 L x 250 W x 450 H 550 L x 280 W x 550 H

Maximum weight (kg) 90 110

Altitude (m) 1000 (up to 2700 for specific application) (**)

Ambient air temperature - 40°C +50°C **

Relative humidity 98%

Pollution level (IEC TS 60815) Very High (IV)

(*) With elongation at break according to ISO/R527 between 20-50%

(**) Extended level to take into account the different situation of the Enel Group DSOs

Example of Self-protected Voltage Transformer (SVT)



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6 DESIGN AND CONSTRUCTION REQUIREMENTS

6.1 Generality

The SVT box shall be made of stainless steel and equipped with suitable brackets for positioning on pole. The SVT shall have an internal voltage transformer (VT) in compliance with IEC 61869-1 and IEC 61869-3, two medium voltage fuses in compliance with IEC 60282-1 and two interfaces of connections made by two external plug-in in compliance with EN 50181. The internal insulation between the components must be made in synthetic poliuretanic resin or equivalent solid insulation, excluding insulating oil and SF6 gas. The internal fuses on the primary circuit shall be incorporated in the solid insulation and not accessible, and shall avoid any external effect in case of a possible internal fault, phase to phase and / or phase to earth including the particular case of double fault phase to earth. The SVT shall be supplied to the Enel with the bracket type GSCS006 and cable 2 x2,5 mm², length 20 m, insulation level 0,6 - 1 kV suitable for outdoor installation for SVT operational conditions (-40°C - + 50 °C).

6.2 Primary terminals The primary terminals of the SVT shall be Plug-in outside cone type A 250A for Um 24 kV GSCT003/1 and /2 and type B 400A for Um 36kV for GSCT003/3 according to EN 50181, suitable for outdoor installation (cycloaliphatic resin or equivalent solution).

In the following drawing an example of primary terminal type A 250 A for 24 kV with sealing gasket and installation from the inside part of the SVT is given:

6.3 Secondary terminals The terminals of the secondary circuit of the SVT shall be made with a specific system connection (female and male parts are included in the supply), including the male part with special cable gland for the passage and locking the cable with outer diameter of 16 mm; according to following technical data:

� Material: Alluminium die cast � Surface: powder coated � Type connection for female part: cage terminal � Type external connection for male part: cage terminal � Limiting temperatures: - 40°C ÷ 125°C � Degree of protection for coupled connector (according to IEC 60529) ≥ IP65 � Number of contatcts: 6 + PE � Rated current ≥ 16 A � Rated voltage ≥ 500 V � Rated impulse voltage ≥ 6 kV � Pollution degree ≥ 3 � Mating cycles ≥ 500

The position of the SVT secondary terminals on the specific connection system shall be in compliance with the following drawing:



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6.3.1.1. Details for secondary terminals The different primary voltage rated values will be obtained by changing the ratio on the secondary winding and the connections on the equivalent harting female part fixed on the SVT, according to the following criteria for each type.

GSCT003/1

� PE = Protection Equipotential (for grounding the secondary terminal) � b = Common secondary terminal (will be connected to PE in the male insert) � a1 = Ratio 20 / 0,1 (kV/kV) � a2 = Ratio 15 / 0,1 (kV/kV) � a3 = Ratio 13,2 / 0,1 kV/kV) � a4 = Ratio 10 / 0,1 kV/kV)

GSCT003/2

� PE = Protection Equipotential (for grounding the secondary terminal) � b = Common secondary terminal (will be connected to PE in the male insert) � a1 = Ratio 13,8 / 0,1 (kV/kV) � a2 = Ratio 13,2 / 0,1 (kV/kV) � a3 = Ratio 12 / 0,1 (kV/kV) � a4 = Ratio 11,4 / 0,1 (kV/kV)

GSCT003/3

� PE = Protection Equipotential (for grounding the secondary terminal) � b = Common secondary terminal (will be connected to PE in the male HARTING insert) � a1 = Ratio 33 / 0,1 (kV/kV) � a2 = Ratio 25 / 0,1 (kV/kV) � a3 = Ratio 23 / 0,1 (kV/kV) � a4 = Not Used

6.3.1.2. Common details for secondary terminals of SVT Each type of SVT shall be provided with equivalent harting system connection, including femal part, male part and cable formation 2 x 2,5 mm2 , flexible conductors, length 20 m, level insulation 0,6 - 1 kV, color of the outer sheath: gray, color of the conductors: blu and brown, suitable for outdoor installation according to following characteristics:

� Operating ambient temperature - 40°C + 50°C � Water resistant AD2 � Impact resistant AG2 � Sun radiation resistant AN2 � Fire retardant according to IEC 60332-1-1 and 2

6.4 Fuses

The SVT configuration types GSCT003/1 and /2 must be equipped with fuses on the primary circuit in compliance with IEC 60282-1, not accessible, embedded in the syntetis poliuretanic resin with the following characteristics:



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� Rated voltage : 24 kV � Rated current : 2 A � Rated breaking current: 16 kA � Rated transient recovery voltage (rated TRV) ≥ 41 kV

The SVT configuration provided in GSCT003/3 must be equipped with fuses on the primary circuit conform to IEC 60282-1, not accessible, embedded in the synthetic poliuretanic resin with the following characteristics:

� Rated voltage: 36 kV � Rated current: 1 A � Rated breaking current: 16 kA � Rated transient recovery voltage (rated TRV) ≥ 61 kV

6.5 Voltage Transformer

Inside the SVT the VT (Voltage Transformer) must be placed and connected to the fuses and to the specific connection system for secondary terminals. The VT (Voltage Transformer) in compliance to IEC 61869-1 and IEC 61869-3 standards, shall be made with synthetic poliuretanic resin or equivalent solution. For the shape of the internal VT (Voltage Transformer) it is possible refer to following drawing (dimension in mm):



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6.6 High Voltage connections Inside the SVT the primary terminals A and B of the VT (Voltage Transformer) shall be connected at the fuses with copper or aluminum bars or tubes having minimum size 25 mm x 3 mm. The fuses shall be connected directly at the internal side of primary plug-in. In this particular point of connection, the minimum distance from active part and metallic ground part (thickness of the solid insulation) must be 50 mm.

6.7 Low Voltage cabling The secondary terminals (ref. point 5.3) inside to SVT shall be cabledat the specific connection system with silicon rubber isolated Cu conductors having minimum section 2,5 mm2.

6.8 Metal enclosure The external enclosure of the SVT must be made with stainless steel AISI 304, with thickness not less than 20/10 mm to ensure safe handling and the sealing in case internal fault.

The fasteners and other small exposed parts must be of stainless steel.

6.9 Internal insulation

The SVT must be made of stainless steel with cover up fixed with sealing gasket rubber for to have IP 65 after closing the cover up. The internal insulation of SVT (Self-protected Voltage Transformer) shall be made with synthetic resin poliuretanic, dielectrically homogeneous and with adequate elasticity degree; or with equivalent solution compatible with resin of VT (Voltage Transformer) and resin of the plug-in cones type A e B, and with a good adherence at internal metallic parts of SVT. The SVT must be totally filled with poliuretanic synthetic resin or equivalent solid insulation.

6.10 Rating plate

The nameplate shall be made in the language of the Country destination, shall be located on the same side of the terminal strip side, must mentioning all the characteristics required by IEC 62271-200 including the year of construction and weight in kg. It must also be reported to the wiring diagram with fuses, the transformation ratio, the degree protection and all informations required by the IEC 61869-1 and IEC61869-3. The ratings of the internal fuses and the compliance to IEC 60282-1 and the compliance to EN 50181 for exernal cones type A and B.

6.11 Marking of primary terminals

Identify with name plates the SVT primary terminals according to IEC 61869-2 (Pole A and B), the Enel Global Type and insulation voltage level, in compliance to the following example:

6.12 Marking of secondary terminals

Reporting the details of the secondary terminals with reference to point 6.3.1.1, near the harting connection of the secondary terminals, in compliance to following example:

A GSCT003/1 – 24kV

kV

A GSCT003/3 - 36 kV

B GSCT003/1 - 24 kV

B GSCT003/3 - 36 kV

ENEL GLOBAL TYPE: GSCT003/1 - 24 kV PE = Protection Equipotential (for grounding the secondary terminal)

b = Common secondary terminal (will be connected to PE in the male HARTING insert)

a1 = Ratio 20 / 0,1 (kV/kV)

a2 = Ratio 15 / 0, 1 (kV/kV)

a3 = Ratio 13,2 / 0, 1 (kV/kV)

a4 = Ratio 10 / 0, 1 (kV/kV)



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6.13 SVT electric scheme The SVT shall be made in according to to following electric schemes for type Um 24kV and type Um 36kV.

6.13.1 GSCT003/1 – GSCT003/2 – Um 24 kV

6.13.2 GSCT003/3 – Um 36 kV



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6.14 Bracket

Each SVT shall be provided with bracket in accordance with GSCS006 for installation on the pole.

Moreover, each SVT shall be provided with support coupling interface in stainless steel in accordance to the following drawing (part. 1 and 2).

Note: The number and size of the holes for fixing the equipment and their interaxes distance shall be stated by the Manufacturer in order to assure the stability of the structure with a weight which is the double of the normal weight of the equipment.

6.14.1 Chile

The SVT shall be provided with a support which has to comply with the technical specification DMAD-0184.

6.14.2 Italy

The bracket GSCS006 shall be fixed on the pole with the stainless steel tape according with DS3230/2 and braces DS3240/2 (ref. GSCS006).

6.14.3 Romania

The bracket GSCS006 shall be fixed on the pole with the stainless steel tape according with DS3230/2 and braces DS3240/2 (ref. GSCS006).



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6.15 Manual and packaging

Each SVT shall be be equipped with the manual for installation and operation, in the language of the Country in which the SVT has to be delivered. It shall also include the procedures to be adopted for storage transportation and dismantle.

Packing for transportation and storage (which does not take part in the homologation process) will be according to the documents referring of each Country.

The primary terminal bushings shall be opportunely protected to safeguard them from impacts that may damage them. These protections shall be realised so not to have a difficult assembling and in order to be removed for the installation.

Outside of the box containing the SVT , it shall be clearly written:

� Name of the Distribution Company; � Name of the supplier; � Description of the product; � Code assigned by the supplier; � Type code and serial number of the Distribution Company; � Gross weight.

7 LIST OF TESTS

7.1 General

On the SVT (Self-protected Voltage Transformer) the tests described in the following paragraphs shall be performed and are divided in:

� Type tests � Routine tests � Special tests

During tests the maintenance is not allowed.

7.2 Type test

The type test according to IEC 61869-1 and IEC 61869-3 shall be apply to VT and SVT separately.

The first two listed type tests are according to IEC 62271-200 and shall apply to SVT only (Visual inspection, partial discharge test).

7.2.1 Visual inspection

The SVT shall be subject to a visual inspection in order to verify the absence of defects and that the construction features and the dimensions are those ones prescribed in the technical specifications. In detail, it must be verified that the characteristics are correctly shown on the rating plate according to present global standard.

7.2.2 Partial discharge test

The test shall be performed in accordance with IEC 62271-200 on the SVT with the following indication:

� SVT partial discharge inception and extinction voltages shall be recorded;

� SVT partial discharge extinction voltage shall not be less than 1,1 Um/√3;

� SVT partial discharges intensity shall not be more than 100 pC at 1,05 Um.

Note: this value with reference to Um are specifically request for this equipment



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7.2.3 Verification of the degree of protection (I P)

The control shall be made in accordance with IEC 60529 on the SVT as defined in this global standard.

7.2.4 Temperature rise test

The test shall be performed in accordance with IEC 61869-1 and IEC 61869-3 on the inside VT and SVT.

7.2.5 Impulse voltage withstand test on primary ter minals


7.2.6 Wet test for outdoor type transformers

The test shall be performed in accordance with IEC 61869-1 and IEC 61869-3 only on the SVT.

7.2.7 Test for accuracy


7.2.8 Short-circuit withstand capability test

The test shall be performed in accordance with IEC 61869-1 and IEC 61869-3 on the VT and SVT.

7.2.9 Verification of local seismic requirements

The local seismic requirements shall be demonstrated with an appropriate analytic method in accordance with the local requirements specified in 4.3.

7.3 Routine tests

The routine tests according to IEC 61869-1 and IEC 61869-3 shall apply to VT and SVT separately.

7.3.1 Power-frequency voltage withstand tests on pr imary terminals

The test shall be performed in accordance with IEC 61869-1 and IEC 61869-3 on the VT and SVT .

7.3.2 Partial discharge measurement

The test shall be performed in accordance with IEC 61869-1 and IEC 61869-3 on the VT.

7.3.3 Partial discharge test

The test shall be performed in accordance with IEC 62271-200 on the SVT with the following indication:

� SVT partial discharge inception and extinction voltages shall be recorded;

� SVT partial discharge extinction voltage shall not be less than 1,1 Um/√3;

� SVT partial discharges intensity shall not be more than 100 pC at 1,05 Um.

7.3.4 Power-frequency voltage withstand tests on se condary terminals


7.3.5 Test for accuracy


7.3.6 Verification of markings

The test shall be performed in accordance with IEC 62271-200, IEC 61869-1 and IEC 61869-3 and present global standard on the SVT.



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7.4 Special tests

7.4.1 Accelerated environmental-electric ageing tes t

The test shall be conducted on the SVT prototype with the primary circuit powered for a period of 500 h, with the range of ambient air temperature -40°C / +50 °C. For all other indications the "annex C" of the IEC 1109 is the reference for perform the test, taking into consideration the following example of accelerated weather ageing cycle under operating voltage:

The test is with successfully if not evident damage of external parts are visible and the SVT is able to withstand a power frequency voltage withstand tests on primary terminals at a value of 80% of the rated power frequency voltage withstand test according to IEC 61869-1 and IEC 61869-3.

7.4.2 Internal arc fault test

The test is required specifically on SVT in accordance with this global standard and has to be performed in compliance with the following prescription.

7.4.2.1. Method test for keeping the internal fault

� Prepare the SVT (Um 24kV and Um 36 kV) on a support compatible with the bracket � The pin "a1" and the pin "b" of secondary terminals shall be short circuited with a conductor of

proper section. The "b" pin of the secondary terminals during test shall be connected to the grounded;

� Set-up the power supply network for 16 kA for 0.5 sec; � Set-up the power supply network to obtain a minimum TRV value of 41 kV (for Um 24kV) and 61

kV (for Um 36 kV) � Power supply primary circuit with MV cables 25 mm2 copper for SVT. � Wait until the occurrence of an internal fault or the fuses operation on the primary circuit; � After the fuses operation the primary supply shall be maintained for a time of 30 minutes.

7.4.2.2. Circuit test for keeping the internal fault

Humidification

Heating 50°C

Demineralized rain

Salt fog: 7 kg/m3

Solar radiation simulation

Voltage: Um / √3 kV

2 4 6 8 10 12 14 16 18 20 22 24

Time



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7.4.2.3. Circuit test for check the dielectric strength after positive passed the internal fault test

Having successfully passed this first test phase (ref. 6.4.1.1) to check the dielectric strength of the primary terminals A and B alternately, applying 40 kV (50 Hz or 60 Hz) x 1 minute for SVT 24kV and 56 kV (50 Hz or 60 Hz) x 1 minute for SVT 36 kV.

7.4.2.4. Conditions for positive result of the internal fault test

� SVT during internal fault has not to shown deformations � SVT during internal fault has not triggered open flame; � SVT during internal fault has been selective respect to the power supply protections � SVT after internal fault can maintaining the safety design conditions � SVT after internal fault has stood the test of dielectric strength according to point 7.4.2.3

8 ADDITIONAL INFORMATION

The SVT must be manufactured in according to following additional information.

8.1 Connector system

The gland for LV cable on the male part of equivalent harting connector system shall be down direction when the SVT is in vertical position, and it is shall be in compliance with following picture:



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8.2 Example of SVT (Self-protected Volatge Transfor mer)

8.3 Gronded connection of the SVT The ground connection for the SVT shall be with two bolts M12x30 in stainless steel AISI 304 positioned in proximity to the primary poles A and B complete with washers and nut.



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9 DOCUMENTATION FOR THE HOMOLOGATION PROCESS

9.1 Documentation of individual components of the S VT

� Test report of the internal VT according to IEC 61869-1 and 3 � Conformity declaration of the internal VT according to IEC 61869-1 and -3 � Drawings and data sheet of internal VT � Test report exernal cones type A and B (primary terminals of the SVT) � Declaration of conformity of the primary terminals according to EN 50181 � Drawings and data sheet of the exernal cones type A and B (primary terminals of the SVT) � Test report of the fuses (Um 24 kV and Um 36 kV) � Declaration of conformity of the HV fuses according to IEC 62281-1 (Um 24 kV and Um 36 kV) � Drawings and data sheet of the HV fuses (Um 24 kV and Um 36 kV) � Test report of the SVT solid insulation (synthetic poliuretanic resin or equivalent solution) � Data sheet of the SVT solid insulation (synthetic poliuretanic resin or equivalent solution) � Drawings and data sheet of the secondary terminals (Harting connection system 6 pin) � Drawings and data sheet of the inox steel used for the SVT

9.2 Documentation of the complete SVT

� Drawings of the SVT assembly with overral dimensions � Drawing of the SVT assembly with the internal position of the fuses � Drawing executive with part list of the SVT assembly � Declaration of conformity of the SVT according to IEC 61869-1 and -3 and IEC 62271-200 � Table with the determination of errors at the following power output: 200, 400, 600, 800 VA

9.3 Documentation referring to the tests performed on the prototype of SVT assembly

� Report of type tests � Report of special tests � Report of acceptance tests



GSCT003 Rev. 02

25/11/2016

10 MAXIMUM DIMENSIONS AND LAYOUT

10.1 SELF-PROTECTED VOLTAGE TRANSFORMER 24 KV (GSCT 003/1-2)

10.2 SELF-PROTECTED VOLTAGE TRANSFORMER 36KV (GSCT0 03/3)

self-protected voltage transformers 24 kv - u 36 kv rev 02... · global standard page 1 of 20...

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