GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 1

GST001 – MV/LV TRANSFORMERS

LOCAL SECTION – CELG D

In addition on what specified in the common part, the following requirements are prescribed:

3.1 LAWS

Portaria INMETRO

378/2010

Requisitos de Avaliação da Conformidade para Transformadores de

Distribuição em Líquido Isolante.

Portaria Interministerial

104/2013

Regulamentação Específica de Transformadores de Distribuição em

Líquido Isolante do Ministério de Minas e Energia.

3.3 LOCAL STANDARDS

ABNT NBR 5440 Transformadores para redes aéreas de distribuição - Requisitos.

E-MT-022 Especificación Técnica de Transformadores de Distribución: Fórmulas para

Evaluación Económica.

5.10 INSTALLATION

Company Mouting System

Single-Pole Double-Pole Surface Level

CELG ≤ 300 Not used Not used

Table 1 – Mounting System

5.12 LOSSES, SHORT CIRCUIT IMPEDANCES AND SOUND POWER LEVELS

The losses shall be in compliance with E-MT-022.

6.3 TANK

The active part, which is mounted to the tank walls, should have devices (hooks, holes, or others) that

facilitate its removal and placement. These devices should be symmetrical and guarantee lifting without

horizontal movement; and they should be different from the tank fastening supports.

6.4 INSULATING LIQUID AND MATERIAL

The oil should have the following characteristics:

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 2

CHARACTERISTICS UNIT VALUES

Minimum Maximum

Appearance -

The oil should be clear, free

of suspended matter or

sediment.

Density 20/4°C - 0,861 (N)

-

0,900 (N)

0,860 (P)

Kinematic viscosity:

(2)

20°C

mm2/s

-

-

-

25,0

40°C 11,0 (N) 12 (P)

100°C 3,0

Fire point °C 140,0 -

Pour point °C - -39,0

Neutralization index mg KOH/g - 0,03

Interfacial tension 25°C mN/m 40,0 -

Color ASTM - - 1,0

Teor de água mg/kg - 25,0

Chlorides - Absent

Sulfates - Absent

Corrosive sulfur - Absent

Dielectric strength kV 30,0 -

Dielectric Loss Factor 100°C

%

- 0,60

or

Dissipation Factor 90°C (3) - 0,50

Oxidation stability:

- Neutralization index mg KOH/g - 0,40

-Borra % mass - 0,10

- Dissipation Factor 90°C (4) % - 20,0

Oxidation inhibitor content DBPC/DBP % mass 0,27 0,33

Percentage of carbons % To write

Polychlorinated biphenyls (PCB) mg/kg Not detectable

Total particle count - -

1500 / 10 ml

(15000 /

100 ml)

DBDS Content (dibenzyl -disulfide) mg/ml Not detectable

(N) – Naphthenic (P) – Paraffinic

Table 2 – Insulating Liquid

SOLID INSULATING MATERIAL

The solid insulating material, of heat stable paper (equal or higher than Class “E” 120º C) will be

required.

GASKETS

Seal materials of transformers should be nitrite rubber or higher, in accordance with ASTM D297,

ASTM D2240 and ASTM D471.

WEIGHT

The maximum weights to transformers admitted are:

Rated power ≤ 150 kVA: 750 kg

Rated power > 150 kVA: 1200 kg

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 3

6.5 BUSHINGS

The LV bushing must be located with Figure 4 and 5.

The bushings should have the following characteristics:

Rated Power

(kVA)

Maximum Low Voltage (V)

Type 220 380

Bushing Bushing

30 1,3/160 1,3/160 T1

45

75 1,3/400 1,3/160 T1

112,5 1,3/400 1,3/400 T1

150 1,3/800 1,3/400 T2

225 1,3/800 1,3/800 T3

300

Table 3 – Bushings Type

The bushings for single-phase transformers should be T1 1,3/160 A.

The bushings should have the characteristics of Figure 10 and 11.

Phase Markings and Identification

The sequence for each phase of the distribution transformer should be marked. The identification should

be engraved in high relief or bas-relief.

During the draft approval stage, details for the required markings and identification will be indicated.

6.6 DE-ENERGIZED TAP-CHANGER

The DETC will be located on the tank side and at the low voltage side installed to ensure tightness. The

lid switch must be fixed to the tank in order to be unmissable.

6.8.1 SUPPORTING

The mounting support for single-pole mounted transformer is also detailed in table below.

Company Positon of the bracket Rated Power

CELG Fixing bracket in the LV side All power values

Table 4 – Position of the Bracket

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 4

6.9 PAINTING

The color is Munsell N6.5.

6.10 ACCESSORIES

Each transformer shall be provided with the accessories as indicate:

Accessory Rated Power ≤ 300 kVA

Lifting and blocking devices X

Oil drain and sampling plug or valve -

Thermometer pocket -

Over pressure valve X

Oil level indicator -

Supports for surge arresters X

Earthing terminals X

Rating plate X

Table 5 – Accessories

6.10.1 LIFTING AND BLOCKING DEVICES

Transformer shall be provided with Two hooks located in the top part of the tank. The hooks will allow

fastening the suspension of the transformer, in such way as not to damage the bushing insulators of the

terminals and accessories and ensure the suspension of the transformer in a horizontal position.

Hook Lifting of the Active Part

Two eyebolts or hooks designated for machine detanking shall be located on the structure of the active

part. The eyebolts will allow fastening in such a way so as not to damage the bushing insulators of the

terminals and ensure detanking with the cover in a horizontal position.

6.10.5 OIL LEVEL INDICATOR

Internal marking paint in the tank.

6.10.6 SUPPORT FOR SURGE ARRESTER

The transformer must be provided of a support (one each phase) for the installation of medium voltage

arresters. The structures may be welded to the tank.

The surge arresters are not considered in the supply.

6.10.7 EARTHING TERMINALS

The transformers shall have a grounding connector, detailed in Figure below.

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 5

Figure 1 – Grounding Connector

6.10.8 RATING PLATES AND PLATE-HOLDERS

The nameplate language shall be in Portuguese.

Additional to data requested in IEC standard must be added:

- Level noise;

- Losses;

- Winding material;

- Serial number;

- Purchase order number;

- Date of manufacture (Day, Month, Year).

The rating plates should have the following characteristics:

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 6

Figure 2 – Rating Plates – Single-phase Transformer

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 7

Figure 3 – Rating Plates – Three-phase Transformer

9.1.5.2 CRITERIA FOR TYPE AND SPECIAL TESTS

Type tests

The selection of samples for type tests shall be two units by type of transformer. The rated power will

be on agreement with the Distribution Company.

Special Test

Short-circuit test. The sample shall be one unit by type of transformer. The rated power will be on

agreement with the Distribution Company.

9.1.4 SPECIAL TESTS

Test for support fixed to tank (ABNT NBR 5440).

10 TRANSPORT AND PACKING

The equipment should be individually packed onto treated wood or plastic pallets in a way suitable for

transport, in such a way as to avoid any damage to equipment. The packing should be suitable for

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 8

introducing equipment into standard transport industry containers. All additional elements of the

equipment should be packed into a single crate.

Transformers should be transported with their complete oil load and accessories in place. The

transformer should be completely secured in its packaging.

Wood should be treated according to international plague control requirements, avoiding compounds

dangerous to human health or the environment, such as “pentachlorophenol” and “creosote”. The

treatment should consider at least: high toxicity to xylophagous organisms, high penetrability and

staying power, chemical stability, and substances which are non-corrosive to metals and which do not

affect the physical characteristics of wood.

A visual inspection of the equipment will be carried out upon receiving it, checking for possible damage

occurred during transport and the warehousing process.

12 FIGURES

Figure 4 – Single-phase Transformer

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 9

Figure 5 – Three-phase Transformer

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 10

Figure 6 – Supporting Single-phase Transformer

Figure 7 – Supporting Three-phase Transformer

Figure 8 – Reinforcement for Three-phase Transformer With P ≥ 225 kVA

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 11

Figure 9 – MV Bushings

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 12

Figure 10 – LV Bushings (T1)

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 13

Figure 11 – LV Bushings (T2 and T3)

GST001 - Local Section CELG D – Normatização Técnica e Desenhos de Rede 14

COMMON LIST

GS

Type

Code

Distribution

Company

and

Country

Country

Code

Rated

Power

(kVA)

Rated

MV

(kV)

Volt.

Reg.

(steps

number x

step%)

Rate

d

LV

(kV)

MV

insulation

level

Um/LI/AC

(kV)

F

(Hz)

N. of

phases

1P,

2P, 3P

Connection

Symbol

Zsc

(%)

MV

bushing

type

MV

Minimum

creepage

distance

(mm)

LV

bushing

type

Losses

classes

or max

values

Load

Loss

(W)

No

Load

Loss

(W)

Noise

level

–

Sound

Power

(dB)

Wheels

(Yes/No)

Overall

dimensions

HxLxW

(mm)

Painting

Brackets

for pole

(Yes/No)

Brackets

for

arrester

(Yes/No

)

GO - Brazil 48061 10 7,97 -3x4,35%

440/

220 15/95/34 60 1P 2,5 Sol. 6 280 Sol. 8 Max.

Value 180 45 48 No 1200x800x

900 Medium Yes Yes

GO - Brazil 48062 25 7,97 -3x4,35%

440/

220 15/95/34 60 1P 2,5 Sol. 6 280 Sol. 8 Max.

Value 355 80 48 No 1200x800x

900 Medium Yes Yes

GO - Brazil 48070 37,5 7,97 -3x4,35%

440/

220 15/95/34 60 1P 2,5 Sol. 6 280 Sol. 8 Max.

Value 485 120 48 No 1200x800x

900 Medium Yes Yes

GO - Brazil 48078 10 19,97 -3x4,35%

440/

220 36/150/50 60 1P 3,0 Sol. 6 680 Sol. 8 Max.

Value 195 55 48 No 1300x800x

900 Medium Yes Yes

GO - Brazil 48080 25 19,97 -3x4,35%

440/

220 36/150/50 60 1P 3,0 Sol. 6 680 Sol. 8 Max.

Value 405 95 48 No 1300x800x

900 Medium Yes Yes

GO - Brazil 48081 37,5 19,97 -3x4,35%

440/

220 36/150/50 60 1P 3,0 Sol. 6 680 Sol. 8 Max.

Value 545 135 48 No 1300x800x

900 Medium Yes Yes

GO - Brazil 48072 45 13,8 -3x4,35%

380/

220 15/95/34 60 3P Dyn1 3,5 Sol. 6 280 Sol. 8 Max.

Value 685 170 48 No 1300x1300

x750 Medium Yes Yes

GO - Brazil 48073 75 13,8 -3x4,35%

380/

220 15/95/34 60 3P Dyn1 3,5 Sol. 6 280 Sol. 8 Max.

Value 1005 255 51 No 1300x1300

x900 Medium Yes Yes

GO - Brazil 48074 112,5 13,8 -3x4,35%

380/

220 15/95/34 60 3P Dyn1 3,5 Sol. 6 280 Sol. 8 Max.

Value 1370 335 55 No 1300x1300

x900 Medium Yes Yes

GO - Brazil 48075 150 13,8 -3x4,35%

380/

220 15/95/34 60 3P Dyn1 3,5 Sol. 6 280 Sol. 8 Max.

Value 1690 420 55 No 1300x1300

x900 Medium Yes Yes

GO - Brazil 48077 300 13,8 -3x4,35%

380/

220 15/95/34 60 3P Dyn1 4,5 Sol. 6 280 Sol. 8 Max.

Value 2970 700 55 No 1800x1600

x1000 Medium Yes Yes

GO - Brazil 48084 45 34,5 -3x4,35%

380/

220 36/150/50 60 3P Dyn1 4,0 Sol. 6 680 Sol. 8 Max.

Value 770 200 51 No 1600x1400

x900 Medium Yes Yes

GO - Brazil 48085 75 34,5 -3x4,35%

380/

220 36/150/50 60 3P Dyn1 4,0 Sol. 6 680 Sol. 8 Max.

Value 1150 280 55 No 1600x1400

x900 Medium Yes Yes

GO - Brazil 48086 112,5 34,5 -3x4,35%

380/

220 36/150/50 60 3P Dyn1 4,0 Sol. 6 680 Sol. 8 Max.

Value 1475 385 55 No 1600x1400

x900 Medium Yes Yes

GO - Brazil 48090 150 34,5 -3x4,35%

380/

220 36/150/50 60 3P Dyn1 4,0 Sol. 6 680 Sol. 8 Max.

Value 1920 475 55 No 1600x1400

x900 Medium Yes Yes

GO - Brazil 2650 112,5 34,5

+2X2,5%

-1X2,5%

380/

220 36/150/50 60 3P Dyn1 4,0 Sol. 6 680 Sol. 8 Max.

Value 1475 385 55 No 1600x1400

x900 Medium Yes Yes

GO - Brazil 5001 112,5 13,8

+2X2,5%

-1x2,5%

380/

220 15/95/34 60 3P Dyn1 3,5 Sol. 6 280 Sol. 8 Max.

Value 1370 335 55 No 1300x1300

x900 Medium Yes Yes