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:
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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