self-contained current transformers 7.2 kv - 420 kv

SVENSKA KRAFTNÄT S W E D I S H N A T I O N A L G R I D

U N I T , B U S I N E S S A R EA O U R R E F E R E N C E

APS TR01-04E

D A T E

2014-11-05 &> any A10 NK, AS, NB, AN C O N S U L T A T I O N S

TECHNICAL GUIDELINE

R E V I S I O N A P P R O V E D

4 Td

SELF-CONTAINED CURRENT TRANSFORMERS 7.2 kV - 420 kV

INTRODUCTION This English text is to be regarded as a translation of the Swedish guideline edition. The Swedish text and the interpretation thereof shall govern the contract and the legal relations between parties.

These guidelines are mainly based on Swedish Standard SS-EN 61869-1 and SS-EN 61869-2. The guidelines specify alternatives in the case of several options in the standards, and also include additions and clarifications to the standards. The guidelines can be made binding conditions for the procurement by the Purchaser, and will in such case together with the applicable standards form specification of the requirements. In this situation the documents will be valid for design and testing of current transform-ers at rated voltages 7.2 - 420 kV.

These guidelines are not applicable for bushing current transformers in power trans-formers, and not for electronic current transformers.

TEKNISK RIKTLINJE 2014-11-05 TR01-04E rev.4


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Revision Notes Change notes Date

B Revision 2006-09-25

3 New template. Collaboration with Vattenfall removed. Thermal short time current 31.5 kA and dynamic short time current 80 kA have been removed. Max. values for Rct have been introduced Current ratio 4000/2 A have been introduced Table with creepage distances have been updated, all creepage distances for both ceramic and non-ceramic insulators are now identi-cal.

2013-02-25

4 New standard SS-EN 61869. Other standards updated. Extended burden range for measurement core changed. Rct for rating 4000/2 added. Appendix 2 test method removed. Formulas for n and ALF removed.

2014-11-05


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Content

1 General ....................................................................................................................... 5

1.1 Applicable standards ................................................................................... 5

1.2 Ambient temperature .................................................................................. 6

1.3 Wind .............................................................................................................. 6

2 Ratings ....................................................................................................................... 7

2.1 Rated insulation level .................................................................................. 7

2.2 Rated frequency. .......................................................................................... 7

2.3 Rated primary current ............................................................................... 8

2.4 Rated secondary current ............................................................................ 8

2.5 Inter-ratio connection ................................................................................ 8

2.6 Continuous load current ............................................................................. 8

2.7 Thermal and dynamic short-time current ................................................. 9

2.8 Cores and windings ..................................................................................... 9

2.8.1 General ........................................................................................... 9

2.8.2 Measuring cores ............................................................................ 9

2.8.3 Relay cores ................................................................................... 10

2.8.4 No-load impedance instrument security factor and

accuracy limit factor ................................................................... 10

2.8.5 Capacitive terminals (only for Um from 82.5 kV to 420 kV) ... 10

2.8.6 Turns correction (only for Um from 7.2 kV to 52 kV) .............. 11

3 Design ...................................................................................................................... 11

3.1 General ....................................................................................................... 11

3.2 Gas insulated current transformers ......................................................... 12

3.3 Mechanical strength .................................................................................. 12

3.4 Primary terminals ..................................................................................... 12

3.4.1 Design .......................................................................................... 12

3.4.2 Mechanical stress ........................................................................ 13

3.5 Secondary terminals .................................................................................. 13

3.5.1 Terminal box for secondary terminals ...................................... 13

3.5.2 Capacitive terminal (only for Um from 82.5 kV to 420 kV) ...... 14

3.5.3 Contact components .................................................................... 14

3.5.4 Earthing clamps .......................................................................... 14


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3.5.5 Clamp design ............................................................................... 14

3.5.6 Secondary damping .................................................................... 14

3.6 Marking ...................................................................................................... 14

3.6.1 Rating plates................................................................................ 14

3.6.2 Constants n and Rct .................................................................... 14

3.6.3 Circuit-diagram plate ................................................................. 14

3.6.4 Plate design .................................................................................. 14

3.7 Insulators ................................................................................................... 15

4 Testing ..................................................................................................................... 16

4.1 Type tests .................................................................................................... 16

4.1.1 No-load curve and winding resistances .................................... 16

4.1.2 Insulator test ............................................................................... 16

4.2 Routine test ................................................................................................. 17

4.2.1 Tan δ test ...................................................................................... 17

4.2.2 No-load curve, instrument security factor ................................ 17

4.2.3 Capacitive terminal tests (only for Um from 82.5 kV to 420

kV) ................................................................................................ 17

4.2.4 Insulator test ............................................................................... 17

4.3 Test certificates .......................................................................................... 17

4.3.1 Type-test certificates ................................................................... 17

4.3.2 Routine-test certificates .............................................................. 17

5 Documentation ........................................................................................................ 18

5.1 General ....................................................................................................... 18

5.2 Tender documentation .............................................................................. 18

5.3 Documentation together with apparatus delivery .................................. 18

5.4 Documentation and spares after delivery ............................................... 19

6 Delivery .................................................................................................................... 19

7 Appendix ................................................................................................................. 20

7.1 Appendix 1. Terminal plates and bolts, dimensions. ........................... 20

7.2 Appendix 2. Component Data List ............................................................ 21


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1 General

1.1 Applicable standards Applicable Swedish Standards are valid. When there is no Swedish Standard, Europe-

an Standard (EN) and IEC Publication shall apply. The latest edition shall apply.

Where current transformers offered do not in every way fulfil the stipulated standards

and the additions of the guidelines, deviations shall be specified.

Applicable standards and guidelines:

SS-EN 61869-1:2013 Mättransformatorer – Del 1: Allmänna fodringar

SS-EN 61869-2:2013 Mättransformatorer – Del 2: Tilläggsfodringar för

strömtransformatorer

IEC 60071-1:2006 Insulation coordination

IEC 60273:1990 Isolatorer – Stödisolatorer för ställverk med system

spänning över 1000 V – Mått och tekniska data

SS-EN 60529:2000 Kapslingsklasser för elektrisk materiel (IP-beteckning).

SS-EN ISO 1461:2009 Varmförzinkade beläggningar på tillverkade järn- och

stålföremål – Specifikationer och provningsmetoder.

SS 421 01 67:2001 Dimensionering av utomhusställverk – Vind- och

islaster.

SS-EN 60059:2010 IEC standard current ratings

IEC 60296:2012 Fluids for electrotechnical applications – unused

mineral insulating oils for transformers and switchgear

SS-EN 62155:2003 “Ceramic insulators”

IEC/TS 60815-2 Guide for the selection of insulators in respect of

polluted conditions.-part 2 ceramic insulators.

IEC/TS 60815-3 Guide for the selection of insulators in respect of

polluted conditions.-part 3 polymer insulators.


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SS-EN 61462:2008 Composite insulators – Hollow insulators for use in

outdoor and indoor electrical equipment

SS-EN 50052 C1:2008 Gjutna aluminiumkapslingar för gasisolerade

metalkapslade högspänningsställverk.

SS-EN 50064 T1, C1:2008 Gasisolerade metallkapslade ställverk – Kapslingar av

plastiskt bearbetat aluminium.

SS-EN 50068 C1:2008 Gasisolerade metallkapslade ställverk – Kapslingar av

smitt stål.

SS-EN 50069 C1:2008 Gasisolerade metallkapslade ställverk – Svetsade

kapslingar sammansatta av gjutet och plastiskt

bearbetat aluminium.

1.2 Ambient temperature It shall be informed at which conditions the current transformer shall be installed on

site and which temperature interval is applicable. The following temperature limits

shall apply for different applications:

Application Lower limit Upper limit

Degrees Celsius

For indoor installation - 25 + 40

Outdoor, with solid and liquid

insulation - 50 + 40

Outdoor, with gas insulation,

north of Dalälven - 50 + 40

Outdoor, with gas insulation,

south of Dalälven - 40 + 40

1.3 Wind For normal applications the wind pressure 700 Pa against a plane surface shall apply.

This corresponds to a wind velocity of 34 m/s. For equipment in exposed locations, e.g.

coastal or mountain areas, a higher wind pressure might be necessary. Design shall in

such case be done with a wind pressure in accordance with SS 421 01 67.


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2 Ratings

2.1 Rated insulation level The following values of insulation level shall be used:

Highest voltage for

equipment

Um

kV (r.m.s.)

Rated lightning

impulse withstand

voltage

kV (peak)

Rated switching

impulse withstand

voltage

kV (peak)

Rated 1 min power

frequency withstand

voltage

kV (r.m.s)

7.2 Current transformers designed for Um = 12 kV

shall be used

12 75 - 28

24 125 - 50

36 170 - 70

52 250 - 95

82.5 380 - 150

145 650 - 275

170 650 - 275

245 950 - 395

420 1425 1050 -

2.2 Rated frequency The rated frequency shall be 50 Hz.


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2.3 Rated primary current It shall be possible to connect current transformers at the secondary winding for rated

currents according to one of the pairs in the following table:

50 – 100 A*)

75 – 150 A

150 – 300 A

300 – 600 A

500 – 1000 A

1000 – 2000 A

1500 – 3000 A**)

2000 – 4000 A**)

*) not for voltages ≥ 82.5 kV

**) measuring cores have normally only the lower current, but loadable to 200% .

2.4 Rated secondary current Current transformers shall normally have a rated secondary current of 1 A, or for

measuring purpose 5 A at smaller substations below 52 kV. In some cases 2 A, in line

with old standard, may be specified.

At a rated primary current of 4000 A the rated secondary current shall always be 2 A.

2.5 Inter-ratio connection Changeover from one ratio to another may only be carried out secondarily for voltages

≥ 52 kV. However, all other demands (e.g. concerning rated burden) must be satisfied,

even for the most unfavourable alternative.

2.6 Continuous load current The rated continuous thermal current for the current transformer shall be the same as

the higher of the rated primary currents.

For voltages ≥ 82.5 kV, extended current rating for measuring transformers shall be

specified for the lower primary current value according to Clause 5.6.201.5 in SS-EN

61869-2, up to 200% of the rated current. The measuring core shall have a fixed con-

nection at the low rated winding. The measuring core shall on request be inter-ratio

connectable as the relay cores.


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For rated current 3000 A, 3150 A as common standard rated current for components

shall apply as continuous thermal current.

2.7 Thermal and dynamic short time current Current transformers shall be designed to withstand thermal and dynamic short-time

currents according to one of the following pairs of current:

For highest voltage for equipment, Um, from 7.2 kV up to 52 kV:

Thermal short-time current during 1 s,

kA (r.m.s.)

Dynamic short-time current,

kA (peak)

100 times primary rated current,

maximum 31.5 kA (r.m.s.)

Peak value = 2.5 x thermal short-time

current during 1 s

For highest voltage for equipment, Um, from 82.5 kV up to 420 kV:

Thermal short-time current during 1 s,

kA (r.m.s.)

Dynamic short-time current,

kA (peak)

40 100

2.8 Cores and windings

2.8.1 General

Current transformers shall be designed with one measuring core and four relay cores.

Each core shall be provided with its particular secondary winding, which shall be elec-

trically completely separated from other windings.

2.8.2 Measuring cores

Measuring cores shall at least fulfil the following requirements:

Rated burden according to Class 0.2 S

VA Rated overcurrent figure, FS

15 <10

The accuracy class shall be kept from 1 VA to 15 VA.


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2.8.3 Relay cores

Relay cores shall fulfil the following requirements:

Rated burden according to

Class 5P30

VA

*) Class 10P30

VA

30 30

*) Only for voltages below 245 kV

2.8.4 No-load impedance instrument security factor and accuracy limit factor

The secondary winding resistance Rct shall be given at 75 °C winding temperature.

Maximum values for Rct are specified in the table below:

Current ratio Max Rct [Ω]

4000/2 9

3000/1 12

2000/1 9

1000/1 5

100, 150, 300, 600/1 5

In addition to SS-EN 61869-2, Clause 5.6.201 and 5.6.202.2.1 the actual instrument

security factor shall be calculated.

2.8.5 Capacitive terminals (only for Um from 82.5 kV to 420 kV)

If nothing else is specified, the current transformers shall be provided with capacitive

voltage terminals for phase synchronizing, relay protection, check of insulation, and

metering data. At Um /√3 and short-circuit between voltage terminal and earth, a

short-circuit current of at least 8 mA should be obtained.

For transformers for a highest rated voltage of 82.5 kV, in exceptional cases a lower

value for this current can be accepted, although not less than 4 mA. The real short-

circuit current shall be stated.


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Any inner load impedance in current transformers between the terminal and earth

shall be purely capacitive, and designed to obtain a no-load voltage of at least 250 V at

Um /√3.

If the transformers are provided with overvoltage protection between the terminal and

earth, this must not have a lower spark over and extinction voltage than 350 V and 250

V respectively. There is no requirement to equip the current transformers with load

impedance or overvoltage protection.

2.8.6 Turns correction (only for Um from 7.2 kV to 52 kV)

Winding turns correction can be accepted if it has no significant pre-magnetizing in-

fluence.

3 Design

3.1 General Current transformers shall be equipped, if possible, with solid insulation. Alternatively

they may have liquid or gas insulation, depending on different environmental de-

mands. The quantity of liquid or gas shall in that case be as small as possible, prefera-

bly less than 200 kg liquid.

3.1.1

All parts exposed to corrosion shall be made of non-corrosive material, or be hot-dip

galvanized according to SS-EN ISO 1461.

3.1.2

Current transformers shall be hermetically sealed if applicable.

3.1.3

Liquid-insulated current transformers shall be equipped with an easily readable liquid

level indicator.

3.1.4

The metallic lower part of the current transformer shall be provided with at least two

earthing clamps for up to 120 mm2 copper conductor.

3.1.5

Current transformers for a highest voltage for equipment of 245 kV or 420 kV shall be

possible to transport in horizontal position.


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3.1.6

Liquid-filled current transformers shall be completely free from PCB.

3.2 Gas insulated current transformers Gas filled current transformers shall preferable have pure SF6 without other gas mix-

tures. If a gas mixture is chosen N2 but not CF4 for environmental reason is accepted.

A gas leakage of maximum 0.5 % is accepted. Gas filled current transformers shall be

monitored by a density relay with a closing contact functioning at two levels (filling,

blocking). The density shall also be indicated on pointer type instrument.

3.3 Mechanical strength Current transformers shall be designed to withstand the mechanical stresses, which

may occur as a result of forces on the primary terminal in accordance with Clause

3.4.2.

3.4 Primary terminals

3.4.1 Design

The supplier shall denote the material of the terminals. The terminals may consist of a

plate or a bolt. If the connection plates have a thickness of less than the required

thickness “e” from Appendix 1 the suitability of the plates shall be verified through a

temperature-rise test. Any additional parts added to the H.V. terminals to fulfil the

required dimensions should be avoided. Dimensions of terminals are shown in Appen-

dix 1.

Terminals of copper or copper alloy shall be tin-plated with a layer of minimum 50

μm, or alternatively silver-plated, with a layer of minimum 20 μm. A copper alloy sen-

sitive to stress corrosion shall not be used.

Terminals made of aluminum or aluminum alloy shall not be surface treated. An alu-

minum alloy sensitive to stress corrosion, layer corrosion or intercrystalline corrosion

shall not be used. Terminal plate of aluminum or aluminum alloy shall have a hardness

of HB minimum 75.


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Terminal plates are selected on the basis of rated current for the transformer as fol-

lows:

Rated current of primary winding,

A

Size,

mm

≤ 300 2 – 40 *)

>300 ≤1000 4 – 75

>1000 ≤2000 9 – 125

>2000 ≤4000 12 – 165

*) Only for unit with highest voltage for equipment ≤ 52 kV

Terminal bolts are selected on the basis of rated current for the transformer as follows:

Rated current of current transformer,

A

Size,

mm

Bolt of aluminum Bolt of copper

≤ 1000 ≤ 1000 30

– ≤ 2000 40

≤ 2000 ≤ 4000 60

3.4.2 Mechanical stress

Current transformers shall fulfil the demands for Class I according to SS-EN 61869-1,

Table 7.

3.5 Secondary terminals

3.5.1 Terminal box for secondary terminals

The terminal box shall be spacious and allow the connection of necessary connecting

leads to be carried out comfortably.

The terminal box shall be semi-enclosed and spray-tight (Protection class minimum IP

54 according to SS-EN 60529) and be provided with rain-protected, net-covered

breather holes. Box-cover gaskets shall be resistant to solar radiation, air, oil and wa-

ter.


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3.5.2 Capacitive terminal (only for Um from 82.5 kV to 420 kV)

The capacitive terminal shall be connected to a separate part in the secondary terminal

box, which is provided with protection against contact or connection. The capacitive

terminal can alternatively be connected to a separate box.

3.5.3 Contact components

All contact components, even screws, shall be made of non-corrosive metal.

3.5.4 Earthing clamps

The terminal box shall be provided with a clamp for earthing of the secondary wind-

ings (regarding earthing of the base, see Clause 3.1.4).

3.5.5 Clamp design

Terminal clamps and earthing clamps shall be designed for connection of up to 6 mm2

stranded conductors, and be such that conductors can be connected without cable lugs

and without sustaining damage.

3.5.6 Secondary damping

Damping circuits, if existing, shall be designed in that way that the components are

available for impedance check.

3.6 Marking

3.6.1 Rating plates

The current transformer rating plate shall include data in accordance with SS-EN

61869-2. Total weight and serial number shall also be specified.

3.6.2 Constants n, ALF and Rct

Real (measured at routine test or type test) values of n and Rct shall be specified on the

rating plate. See paragraph 2.8.4 and 4.1.1.

3.6.3 Circuit-diagram plate

A lastingly legible circuit-diagram plate showing the transformer connection and ter-

minal markings shall be permanently fixed to the transformer near the terminal box.

The discriminating main data for each core shall be clear from the plate.

3.6.4 Plate design

The rating plates shall be made of anodised aluminium sheet or equivalent non-

corrosive material, and shall be fixed with non-corrosive screws. Deviations from this

may only be done after approval by the purchaser.


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3.7 Insulators Insulators shall be of composite for current transformers with a highest voltage Um of

245 and 420 kV. For current transformers with a highest voltage Um < 245kV compo-

site insulators are preferred. Composite insulators shall be designed and tested in ac-

cordance with applicable standards and SS-EN 61462. Ceramic insulators shall be

designed and tested in accordance with applicable standards and IEC/TS 60815-2.

For some exposed locations an increased creepage distance and the possibility for

insulator washing may be required. The possibility for washing shall then be specified

in the request for tender. Current transformers may be washable, washable with con-

strains or not washable. If the current transformer is washable with constrains the

constrains shall be specified in the tender.

In a normally polluted environment a creepage distance of Site Pollution Severity

(SPS) class b is required and for polluted environment class d is required. Increased

creepage distance is recommended in the west coast of Sweden (approximately 30 km

from the coast and in the valley of the river Göta älv up to the Lake Vänern.

If not other specified the same creepage distance shall be valid for composite and ce-

ramic insulators. The requirement is based on the figure below. For normal environ-

ment SPS class b is valid and for polluted environment class d, according to IEC/TS

60815-2 and IEC/TS 60815-3.

Creepage distance (unified specific creepage distance, USCD) as

function of pollution (SPS class)

The required creepage distances for insulators in normal and polluted environment are

specified in the table as follows:


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Rated voltage,

Um

kV

Minimum creepage distance, mm

ceramic/composit

Polluted environment

(klass d)

(klass d)1

Normal environment

(klass b)

(klass b)1 12 300 190

24 600 380

36 900 570

52 1300 830

82,5 2060 1320

145 3620 2320

170 4250 2720

245 6120 3920

420 10500 6720

4 Testing

If the test laboratory of the supplier complies with ISO 17025, the laboratory is consid-

ered to fulfil the accuracy demands. If not so, the supplier must show the documenta-

tion on test procedures and the traceability of the standards.

4.1 Type tests It shall be presented, that demands on tightness, insulation and accuracy are fulfilled

even at the lowest temperature.

4.1.1 No-load curve and winding resistances

A complete no-load curve shall be plotted in order to determine constant n and ALF

(see Clause 2.8.4) and to check the no-load impedance in accordance with Clause

2.8.3.

The secondary winding resistance shall be measured and constant Rct (see Clause

2.8.4) shall be specified at 75 °C winding temperature.

The instrument transformer security factor and accuracy limit factors shall be calculat-

ed and given according to Clause 2.8.4.

4.1.2 Insulator test

Insulators shall be tested according to applicable standards, and to SS-EN 61462

(composite) and IEC/TS 60815-2 (ceramic) respectively. See also Clause 3.7.


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4.2 Routine test

4.2.1 Tan δ test

The tan δ of the main insulation shall be measured at ambient temperature and at

different voltages: at 10 kVr.m.s. and also around Um/√3 and if possible up to full power

frequency voltage. The test is not intended for gas insulated transformers.

4.2.2 No-load curve, instrument security factor

For measuring cores a complete no-load curve shall be plotted in order to determine

the instrument security factor “n” (see Clause 2.8.4) and a check of no-load imped-

ance, Clause 2.8.3.

A check shall be performed if demands are met for the accuracy limit factors of relay

protection cores (Clauses 2.8.3 and 2.8.4).

4.2.3 Capacitive terminal tests (only for Um from 82.5 kV to

420 kV)

The voltage ratio and the capacitance of the capacitive terminal shall be measured:

> Tan δ shall be measured at 2 kVr.m.s..

> 1 min power frequency test shall be performed with 4 kVr.m.s..

4.2.4 Insulator test

Insulators shall be tested according to applicable standards and to SS-EN IEC 61462

(composite) and IEC/TS 60815-2 (ceramic) respectively. See also Clause 3.7.

4.3 Test certificates

4.3.1 Type-test certificates

If production has been moved to another plant, material has been changed, or if type-

test certificate is more than five years old, then the type-test certificate cannot be ac-

cepted unless special agreement.

4.3.2 Routine-test certificates

The routine test certificates shall include, in addition to the routine-test results, the

following information:

> Current transformer data.

> Constants “n”, “ALF” and Rct for all cores.

> Purchaser’s reference number.

> Serial number.

> Reference to dimension drawings.


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5 Documentation

5.1 General Instructions, dimension drawings and diagrams, handed over at delivery of the current

transformer, shall be in Swedish.

5.2 Tender documentation With the tender the following documents shall be provided:

> List of data, dimension drawings, electrical circuit and schematic diagrams, in-

structions for erection, operation and maintenance, type test certificates and also

other documents needed for the technical evaluation.

> Bases for evaluation of the need and costs for maintenance, such as:

The interval for condition control and other measures of maintenance and the

time necessary for these works.

Necessary spares, special tools and accessories and the costs for these.

> Environmental information as below (see also TR 13-01):

The interval for condition control and other measures of maintenance and the

time necessary for these works.

Information about the main content of the equipment (type of material in per-

centage of weight); information about the content of dangerous substances

(for example heavy metals, carcinogenic compounds and compounds hard to

biodegrade, xenobiotic substances)

Handling and treating of the equipment when it has served its time.

5.3 Documentation together with apparatus delivery In connection with the apparatus delivery the following documents shall be submitted

electronically and in one paper copy, if not otherwise agreed:

A list (current transformer chart) including:

> Purchasing and order number

> Manufacturer

> Type

> Serial number


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> Rated data

> Type test certificates

> Dimension drawings.

Verification (title and number) of the following documents that shall be delivered to-

gether with the list:

> General assembly drawings and drawing lists

> Instructions for transport, storing, erection, service, testing, condition monitoring

and adjustment

> List of other chemical products including gas

> List of products and protective information for all listed chemical products

> List of special tools and accessories for erection and maintenance

> List of equipment for testing and condition control

> List of spares

> Final dimension drawings

> Final circuit diagrams

> Routine test certificates

> Filled in Component data list according to Appendix 2

A complete compilation file shall be handled over to the buyer, latest when all ordered

current transformers are delivered. It shall include test certificates for all current

transformers of the delivery in accordance with paragraph 4.3.2.

5.4 Documentation and spares after delivery The manufacturer shall at request provide the purchaser with necessary service bulle-

tins and during at least ten years after delivery with for the maintenance necessary

spares. Improvements in design or instructions, which can be applied to the equip-

ment supplied, shall be notified to the buyer also after delivery, preferably in the form

of service bulletins.

6 Delivery

The delivery is not considered complete until entire test certificates and required doc-

umentation have been submitted to the purchaser and have been approved.


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7 Appendix

7.1 Appendix 1. Terminal plates and bolts, dimensions.

Bolt Length 125 mm : Diameter : 30, 40, 60 mm

Plate Figure Measure

(mm) :

a b c d e

2 - 75 1 2-hål 75 17,5 40 14 10

4 - 75 2 4-hål 75 17,5 40 14 15

9 - 125 3 9-hål 125 22,5 40 14 35

12 - 165 4 12-hål 125 22,5 40 14 35


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7.2 Appendix 2. Component Data List

Tabell 1

Apparatdatalista för strömtransformatorer

Svenska Kraftnät

Beskrivning Värde Enhet Noteringar

Allmänt

Station * Ifylls av ställverksbyggaren EX

Hagby, CT 65

Objekt id/Littera * Ifylls av ställverksbyggaren EX

CL6 S5-IT

Beskrivning * Strömtransformator

Lägsta omgivningstemp °C Ex -50

Inköpsnummer *

Leverantörens ordernummer *

Tillverkare *

Typbeteckning *

Tillverkningsnummer * nummer

Levererad * ååmm

Utförandeform *

Fristående/genomföring (trafo,

reaktor)

/kabelströmsgenomföring

Huvudkonstruktion * Utomhus/inomhus

Kontruktionsspänning kV EX 420kV

Märkström A

Märkkorttidsström, 1s kA

Stötström, dynamisk kA

Primär isolationsnivå till jord -

kort stöt

kV EX 1425


lång stöt kV EX 1050


50Hz 1 min

kV EX 395

Sekundär korttids växelsp.

lindn-lindn, lindn-jord kV EX 4

Spolbarhet * Ja/Nej/Begränsad

Minsta fasavstånd m

Vikt per fas kg

Norm, Riktlinje * EX TR1-04, rev4


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Standard * SS-EN 61869-1, SS-EN 61869-

2

Ombyggnadsdatum * ååmm

Senaste drifttagningsdatum * ååmm

Omkopplingsbar

(normalt sekundärt) EX sekundärt

Märkomsättning 1-Primär

märkström

A EX 2000

Märkomsättning 2-Primär

märkström A EX 4000

Inkopplad omsättning A EX 2000

Sammanställningsritning * Ritningsnummer

Måttskiss * Ritningsnummer

Montage och skötselanvisning * Ritningsnummer

Kretsschema * Ritningsnummer

Provningsnormal * Ritningsnummer

Isolermedium olja/gas/torr, spec nr

Mängd isolermedium kg

Kapacitivt uttag * Ja/Nej

Max statisk horisontell

anslutningskraft N EX 3000

Max statisk vertikal

anslutningskraft

N EX 3000

Apparatuttag, storlek EX 9-125 (platta), 60

(tapp)

Kapslingsklass anslutningslåda * IP54/55

Typ av isolator * porslin/komposit

Krypsträcka isolator mm

Ritningsnr strömtransformator *

Ritningsnr isolator

Kärnor

kärna 1 *

Märkbörda kärna 1 VA Ex 15

Utökad termiskt mätområde

omsättning 1 * Ex 200%

Märkomsättning 1-Sekundär

märkström

A Ex 1

Klass kärna 1 * EX 0,2 S

Överströmstal Fs kärna 1 *


23/23

Konstanten RCT för kärna 1 ohm

kärna 2 *

Märkbörda kärna 2 VA


märkström

A Ex 1

Klass kärna 2 * EX 5P30

Överströmstal ALF kärna 2 *


kärna 3 *



märkström

A Ex 1




kärna 4 *



märkström

A Ex 1




kärna 5 *



märkström

A Ex 1




self-contained current transformers 7.2 kv - 420 kv

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