1KGC600246_Tech_Spec_Auxiliary Transformer_substation22-66kV_modif.pdf

7/27/2019 1KGC600246_Tech_Spec_Auxiliary Transformer_substation22-66kV_modif.pdf

http://slidepdf.com/reader/full/1kgc600246techspecauxiliary-transformersubstation22-66kvmodifpdf 1/12

ABB AG

Project-Document-Number Project UA Doc. Ident No Index Sheet No. No. of sheets

0242029505 Bambous Mauritius 1KGC 600 246 1 11

Title (Type of Document)

100 kVA Auxiliary TransformerSpecification

Derived from: Re laced b : Re laces: Format Lan . Off. res . Ref. File name

A4 E PSPG-E21 Ti1KGC600246_Tech_Spec_Auxiliary Transformer.Doc

0 FIRST ISSUE Spak Drews Fleck 08.07.2013



PSPG-E21

1KGC 600 246Technical Specification

100 kVA Auxiliary Transformer

Rev.

0

Sheet No.

2/11

Rev.

Revisions Angaben:

Date Rev.Index

Section Revision particulars

08.07.2013 0 First issue



PSPG-E21



Rev.

0

Sheet No.

3/11

Rev.

LIST OF CONTENS

1

General ........................................................................................................... 4

2 Site conditions ................................................................................................. 4 3 Ratings ............................................................................................................ 4 3.1 System variation ................................................................................................. 4 3.2 Vector Group ...................................................................................................... 4 3.3 Noise Level ......................................................................................................... 4 4 Construction Requirements ............................................................................. 4 4.1 Internal Arrangement .......................................................................................... 4 4.2 Enclosure ............................................................................................................ 5 4.3 Windings ............................................................................................................. 5 4.4 Insulation Level ................................................................................................... 5 4.5 Terminals ............................................................................................................ 5 4.6 Cooling ................................................................................................................ 5 4.7 Cable Boxes ....................................................................................................... 6 4.8 Winding Temperature detectors .......................................................................... 6 4.9 Off-Load Tap Changer ........................................................................................ 6 4.10 Fittings and Accessories ..................................................................................... 6 4.11 Bushings and Insulators ...................................................................................... 7 4.12 Painting ............................................................................................................... 7 4.13 Rating plates ....................................................................................................... 7 5 Testing ............................................................................................................ 8 5.1 Routine Tests ...................................................................................................... 8 5.2 Type Test ............................................................................................................ 8 6 Documentation ................................................................................................ 8 7 Auxiliary Transformer Data sheet .................................................................. 10



PSPG-E21



Rev.

0

Sheet No.

4/11

Rev.

1 General

This technical specification shall act as a minimum requirement for the transformer to be deliv-ered.

All transformers and their accessories have to be in accordance with the EN, IEC rules and reg-ulations valid at the time of manufacturing. The design must be well proven and shall include thenewest state of art. Restrictions regarding material and sub-supplier have to be considered.

In case of change of the original quality, guarantied by the supplier, in the level of sub suppliersthe purchaser keeps the rights to check the sub-suppliers quality (i.e. coolers, tap change, tank,monitoring devices, bushings etc.).

2 Site conditions

Refer to contract documents:

ANNEX-General-Site-Conditions

3 Ratings

Manufacturer shall indicate the base rating of the transformer for operation in an ambient of 40°Cand furnish the de-rating factors for equipment rating for different ambient temperatures.

3.1 System variation

Transformer shall be capable of continuous operation at maximum kVA rating and within limit oftemperature rise at system continuous deviation of up to and including the following percentage

of the rated system:

- Voltage: ± 10%

- Frequency: ± 5%

3.2 Vector Group

Vector group is specified as Dyn11.

3.3 Noise Level

The noise power level (LWA) produced by transformer operating at rated voltage and frequencyat either no load or full load shall be below 63 dB(A).

4 Construction Requirements

4.1 Internal Arrangement

Transformer core shall be of robust design adequately braced to prevent displacement due toelectromagnetic stresses of short circuit, and the mechanical shocks of normal moving and han-dling of the transformer without any need for special shipping braces.



PSPG-E21



Rev.

0

Sheet No.

5/11

Rev.

4.2 Enclosure

Minimum degree of protection for dry type CAST-COIL transformer shall be IP31 for indoor instal-lation.

4.3 Windings

Transformer shall have separate low and medium voltage windings. Material for the winding con-ductor shall be following:

- Primary winding conductor material Al

- Secondary winding conductor material Al

- Winding manufacturing (MV/LV) Encapsulated / Impregnated

The MV winding shall have tapping at ± 2.5% and ± 5.0% of the rated MV voltage.

The winding coils shall be adequately braced to prevent distortion of the windings or movement ofthe coils on the core limbs under short circuit condition or normal moving and handling of thetransformer.

Winding manufacturing shall be as specified in chapter 7.

4.4 Insulation Level

The rated short duration power frequency withstands voltage and rated lighting impulse with-stands voltage shall be as follows:

- Primary insulation level kV LI 125 / AC 50 / Um 24

- Secondary insulation level kV LI - / AC 3 / Um 1.1

4.5 Terminals

To provide a 4-wire system, the low voltage starpoint connections shall be brought out on a sepa-rate terminal.

Terminals shall be marked in accordance with the connection diagram marked on the rating plate.

The stems and bushing of the terminals shall be sealed in leakproof manner into the tank wall or

cover, rotations of terminal stems shall be prevented by effective locking.

Transformer shall be provided with external earthing terminals.

4.6 Cooling

The transformer shall be natural air-cooled (AN).



PSPG-E21



Rev.

0

Sheet No.

6/11

Rev.

4.7 Cable Boxes

Cable entries into the box shall be located such that conductors can be clamped straight into the

terminal connectors without being bent into tortuous shapes inside the box.

MV and LV cable entry shall be from the bottom side.

Cable boxes for PVC or XLPE insulated cables shall be dry type. Single core type cables shall beglanded to non-magnetic plates.

4.8 Winding Temperature detectors

The temperature of LV winding shall be monitored with embedded temperature detectors (Pt100RTD) located at or close to the design hot-spots for each phase.

4.9 Off-Load Tap Changer

Tap changing on the MV winding shall be done by externally hand operated off-load tap changingswitch. The switch shall preferably satisfy the following requirements:

- The switch shall be operable by its handle without the need of additional tool and withoutrisk to personnel safety

- The contact changing shall be positive snap action arranged so that it is impossible for thecontacts to be left in a position where the circuits remains interrupted

- The stops shall be robust type to prevent overrunning

- Padlocking of the switch shall be provided

- Tap positions shall be clearly marked

- The driving rod through the tank cover or wall shall be sealed to prevent leakage of air,gas or liquid under all service conditions

4.10 Fittings and Accessories

The following shall be provided as a minimum:

- Winding temperature sensor (Pt-100) per phase

- T-154 temperature control unit

- Lifting lugs for lifting the entire transformer

- Skid under base with bi-directional rollers

- Rating plate & KKS tag number plate

- Pulling eyes

- Arc protection relay



PSPG-E21



Rev.

0

Sheet No.

7/11

Rev.

4.11 Bushings and Insulators

The bushings and insulators shall be rated for maximum system voltage and comply with re-quirements of IEC. Neutral bushings to be provided for earthing the neutral. All bushing shall bemarked with symbols as per rating plate and connection diagram.

Bushings and insulators shall be of a high quality, high-strength material capable of withstandingrough handling during transport, erection or maintenance.

4.12 Painting

Painting should be carefully selected based on the local conditions (ANNEX-General-Site-Conditions). Minimum thickness 70µm is required. The colour shall be RAL 7035.

4.13 Rating plates

The rating plate shall give the following information’s:

- The international specification to which transformer conform to

- Vector group and winding connection

- Percentage tapping positions of rated voltage

- Rated MV voltage at zero tapping

- Rated LV voltages at no load and full load at above conditions

- Rated ambient temperature

- Rated kVA

- Rated full load current and short circuit current withstand for 3 seconds

- Impedance voltage

- Enclosure class

- Insulation Levels

- Cooling system

- Efficiency at full load

- Lifting weight

- Transformer type, make, serial number, year of manufacture and PO number



PSPG-E21



Rev.

0

Sheet No.

8/11

Rev.

5 Testing

The transformer shall be tested by the manufacturer to the requirements of the specified interna-tional standards.

5.1 Routine Tests

Transformer shall be subjected to the following routine tests:

- Measurement of winding resistance; on all taps

- Measurement of voltage ratio on all taps and check of voltage vector relationship

- Measurement of impedance voltage (at zero tapping), short circuit impedance and loadloss

- Measurement of no-load loss and current

- Separate source voltage withstand test

- Induced over voltage withstand test

- Partial discharges measurement

- The insulation resistance of each winding in turn to all other windings, core and frame ortank connected to earth shall be measured and recorded. The coil and winding tempera-tures shall be measured immediately prior to the test and be recorder

If required, all tests to be witnessed by Owner/Customer.

5.2 Type Test

Type test certificate shall be provided.

6 Documentation

The following shall be provided by the manufacturer:

- Foundation fixing arrangement drawing

- General arrangement drawing / Overall dimensional drawing- Rating plate drawing

- Connection/ terminal diagram

- O&M Manual

- Transport / lifting instructions

- Completed equipment data sheets

- Installation instructions

- Operating instructions

- Inspection and test plan



PSPG-E21



Rev.

0

Sheet No.

9/11

Rev.

- Weight data sheet

- Type test certificate

- Routine test certificate

- Recommended spare parts list for two years in operation including price list

- FAT test report

- As built documentation after commissioning



PSPG-E21



Rev.

0

Sheet No.

10/11

Rev.

7 Auxiliary Transformer Data sheet

Electrical & Technical Data

Characteristic

Product nameDry Type CAST-COIL Transform-er

Application DistributionRated power [kVA] 100Primary voltage [V] 22000Primary tappings +2 -2 2.5%Secondary voltage at no load [V] 420

Primary insulation level [kV] LI 125 / AC 50 / Um 24

Secondary insulation level [kV] LI - / AC 3 / Um 1.1

Frequency [Hz] 50Number of phases 3

Vector group Dyn11 Ambient temperaturemax./monthly/annual average

°C 40 / 30 / 20

Max. average temperature rise (HV/LV) [K/K] 100 / 100Environmental, climatic, fire class E2, C2, F1Temperature class (HV/LV) F/F Altitude (a.s.l.) [m] < 1000Location IndoorPerformance values

Standards IEC 60076Impedance [%] 6 (±10% Tol.)

No load losses [W] 600 (+15% Tol.)Load losses at 120 °C [W] 2100 (+15% Tol.)Sound power level (LWA) [dB(A)] 63Preliminary dimensions and weight IP31 (IP00)

Length [mm] 1450(1150)Width [mm] 1050(650)Height [mm] 1600(1200)Roller distance (c/c) [mm] x 520Total weight [kg] 1000 (700)

Scope of supply Quantity/Pcs

Power Transformer , existing of:

1 pc Auxiliary Transformer 100kVA 22/ 0,42kV

1 pc



PSPG-E21



Rev.

0

Sheet No.

11/11

Rev.

Type of design IP31

Cooling ANPrimary winding conductor material AlSecondary winding conductor material Al

Winding manufacturing (HV/LV) Encapsulated / ImpregnatedFeatures/ Accessories

Off circuit tap changer on primary windingPT100 Temperature sensor per phaseT-154 Temperature Control Unit Arc Protection RelayBi-Directional wheelsStandard rating plateEarthing terminalsEnclosure IP31

RAL 7035, 70 µmHV cable entry: Bottom

LV cable entry: BottomDocumentationLifting lugs & Pulling Eyes



ANNEX 1 – GENERAL SITE CONDITION

ITEM DESCRIPTION UNITS SCHEDULE A

1.0 GENERAL SITE CONDITIONS

1.1. Ambient Temperatures

1.1.1. Maximum (yearly) °C 40

1.1.2. Minimum (yearly) °C 5

1.1.3. Mean over 24 hours °C 20

1.2. Altitude m Sea level to 550m

1.3. Climate Type

Small tropical island in

the Indian Ocean - Wet

and humid coastal

conditions with

cyclones

1.4. Relative Humidity Above 90%

1.5. Atmosphere Saline

1.6. Surge ground flash intensity

flashes

km2

/yr.

< 2

1.7. IEC Pollution severity level IEC High (25 mm/ kV)

2.0 66 KV EQUIPMENT PARAMETERS

2.1 Power frequency Hz 50

2.2 Number of phases - 3

2.3 Maximum system voltage Umax kV rms 72.5

2.4 Continuous current rating A rms 2000

2.5Surge impulse (1.2/50 µsec) insulation

withstand level at sea level (BIL)

kV

peak325

2.660 second 50 Hz power frequency

insulation level (phase to ground).kV rms 140

2.7 Earthing factor 1.4 (effectively earthed)

2.8Minimum creepage distance (IEC high

pollution)mm/kV 25

2.9 Minimum creepage over external

insulation to earthmm > 2048

3.0 One second three phase symmetrical

short circuit current.kA rms 31.3

3.1 Short circuit current off set peak kA

peak63.8

1KGC600246_Tech_Spec_Auxiliary Transformer_substation22-66kV_modif.pdf

Documents

Transcript of 1KGC600246_Tech_Spec_Auxiliary Transformer_substation22-66kV_modif.pdf