11kv-33kv CTPT/CTVT Oil Cooled

11kv-33kv Oil Cooled Outdoor Type Combined CTPT/CTVT Unit

National Electricals is one of the leading manufacturers of 11kV to 33kV oil cooled/immersed; pole-mounted combined CTPT/CTVT Unit for outdoor installation used in metering purpose. Our product is being manufactured using industry best practices/processes and is 100% tested before final dispatch as per NABL guidelines in our state of the art fully equipped lab under the supervision of experienced and well-qualified engineers. Our product is fully type tested as per the latest standards from government/NABL approved laboratories like ERDA/CPRI.

 

Units are available in 3 Phase 3 Wire or 3 phase 4 wire system used for single or double metering or as per customer’s requirements.


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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 3156: 1992
    • IS 335: 1983
    • IS 2099:: 1986
    • IS 5561
    • IS 4201

  • Title

    • Specification for Current Transformer
    • Specification for Voltage Transformers/Potential Transformers
    • Specification for Transformers Oil
    • Specification for bushing for AC voltage above 1kV
    • Specification for Terminal Connector
    • Application Guide for Current Transformer

Features:

 

  • Outer chamber or tank: Made of Mild Steel having inner and outer coats of branded primer and enamel paint or hot-dipped galvanized as per customer’s requirement.
  • Insulators: Procured from reputed manufacturers like GE, Tayal, etc, confirm to latest IS standards and specifications having sufficient creepage distance.
  • Primary and Secondary Winding: Coated Super Enamelled round copper wire from reputed manufacturers like BIC, Atlas, etc confirming to latest IS Standards is used. Insulation using high-quality craft paper is done with alternate layers.
  • Core: Nano type, CRGO, HPDR, MOH, M-4, M-3, or ZDKH toroidal core is used for CT depending on customer’s requirement. The high-Quality core is used in PT.
  • Transformer Oil: The oil is filtered with 5 stage filtration process like heating degassing, vacuumed and dried, etc and filled under vacuum. Transformer oil is confirming to IS 335 and procured from reputed suppliers like APAR, Savita.
  • 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

  • 11KV

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

  • 33KV

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

  • System Particulars

    • No. Of CTs and PTs

    • 3 Nos. CTs & 1 No. 3 – Phase PT
    • 3 Nos. CTs & 3 Nos. 1 – Phase PT or as per specifications.

  • Specific Particulars

    • Short Time Thermal Current (STC)
    • Output (Burden)
    • Accuracy Class
    • Secondary Current (CT)
    • Primary Current (CT)
    • Primary Voltage (PT/VT)

    • As per customer requirement – In general, CT is to be specified with STF of 100 for 1 Sec. or STC (lth) equal to the system fault level whichever is lower. KA ( r.m.s. )
    • 10 VA to 100 VA for VT & 5 VA to 30 VA for CT
    • 0.2S, 0.2, 0.5S, 0.5, 1.0 for CT & 0.2, 0.5 & 1.0 for PT/VT
    • 1 Amp or 5 Amp
    • 5A to 1200A or as per customer requirement.
    • 11KV, 22KV, 33KV for 3-Phase VT & 11/v3, 22/v3, 33/v3 for 1-Phase VT