Current Transformer

Posted On February 17, 2018 at 12:02 pm by / 42 Comments

1 Design Standard IEC 60076
2 Type Three Phase Wound Core/Stack Core
3 Installation Outdoor, Tropical, High Rainfall & Humidity
4 Winding Material High Conductivity Copper
5 Core Type and Material CRGO Silicon Steel
6 Nominal Voltage HT = 11000 V t0 33000 V & LT = 415 V
7 Rated Frequency 50 Hz
8 BIL (Basic Insulation Level) HT Winding = 75 KV, LT Winding = 2.5 KV
9 Power Frequency Withstand Voltage HT Winding = 28 KV, LT Winding = 2.5 KV
10 Vector Group DYn 11
11 Cooling Method ONAN
12 Maximum Temperature Rise at Full Load & at Rated tap position:

  • Winding
  • Insulating Oil
  • Shall not exceed 65° C (Resistance Method)
  • Shall not exceed 60° C (Thermometer Method)
13 Tap Changer Off Load type; +1 x 2.5%, 0, -3 x 2.5% of rated voltage
14 Bushing:

  • Type & Material
  • Connectors
  • Quantity
  • Mounting Position
  • Outdoor type, Porcelain as per IEC 60137
  • Bolted ring type
  • HT = 3, LT = 4
  • HT – On the tank cover, LT – On the side of the tank
15 Tank:

  • Design
  • Ground Provision
  • Lifting Facilities
  • Conservator
  • Breather
  • Painting
  • Bolted type complete with cover and gasket
  • with bolted ring type connector
  • Provided with Facilities for lifting the core and coil
  • Provided
  • Silica Gel Breather
  • Light Gray, ANSI Color # 70
16 Insulating Oil New, Unused, Mineral oil as per IEC 60296 & BS 148

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