11kV-33kV CT Dry Type

11kV-33kV Current Transformer (Resin cast/Dry Type)

National Electricals is one of the leading manufacturers of 11kV to 33kV resin cast dry type current transformer for indoor installation. Our product is being manufactured using industrial best practices/processes and are 100% tested before final dispatch as per NABL guidelines in our state of the art fully equipped lab under the supervision of experiences and well qualified engineers. Our product is fully type tested as per latest standards from government/NABL approved laboratories like ERDA/CPRI.


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Our product confirms to following standards and latest amendments. All products are confirming to following standards:-

  • Specification

    • IS 2705: 1992
    • IS 5561
    • IS 4201

  • Title

    • Specification for Current Transformer
    • Specification for Terminal Connector
    • Application Guide for Current Transformer

  • Primary and Secondary Winding: Coated Super Enamelled round copper wire from reputed manufacturer like BIC, Atlas etc confirming to latest IS Standards is used.
  • Insulation: High quality epoxy resin is used. Casting is done under vacuum in automated best in market epoxy resin cast plant.
  • Core: Nano type, CRGO, HPDR, MOH, M-4, M-3 or ZDKH toroidal core is used for CT depending on customer’s requirement. High Quality core is used in PT.
  • Testing: Each unit undergoes all routine tests in our state of the art lab, by our well experienced and well qualified engineers before dispatch.

  • General Particulars

    • Highest System Voltage ( H.S.V.)
    • Power frequency dry/ wet withstand voltage on the primary winding for one minute
    • Lightning Impulse withstand Voltage ( 1.2 x 50 μs )
    • PD measuring Voltage / Permissible Voltage

  • 11KV

    • 12 KV (r.m.s.)
    • 28 KV (r.m.s.)

     

    • 75 KV (r.m.s.)
    • 7.6/50

  • 33KV

    • 36 KV (r.m.s.)
    • 70 KV (r.m.s.)

     

    • 170 KV (r.m.s.)
    • 23.0/50

  • Specific Particulars

    • Rated Transformation Ratio
    • Rated Primary Current
    • Rated Secondary Current
    • Short Time Thermal Current (Ith)
    • Ith duration
    • Short Time Dynamic Current
    • Number of Cores
    • Output Burden
    • Accuracy Class
    • IAF, ALF, Knee Point Voltage, Exciting Current & Resistance
    • Type of construction

    • As per customer requirement (in Amp.)
    • Upto 1200 Amp.
    • 1 Amp / 5 Amps / 0.577 Amp
    • As per customer requirement – In general, CT is to be specified STC (lth) equal 3.0KA to  40KA.
    • 0.5 to 3.0 Second
    • 2.5 X Ith KA (Peak)
    • Upto 3 cores or as per customer requirement.
    • Upto 60VA, 0.8 pf Lagging
    • ForMetering: 0.2S, 0.2, 0.5S, 0.5, 1.0 & 3.0 & For Protection: 5P, 10P, 15P ,20P & PS
    • As per customer requirement / Design Constraints

     

    • Epoxy Resin cast suitable for different panels.