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11 Kv Ring Main Unit

11 Kv Ring Main Unit

Peace of mind

  • 1. Gas insulated, metal enclosed, indoor/outdoor, Extensible/non- extensible factory assembled type tested switchgear as per new IEC 62271-J 00/200.
  • 2. Stringent quality standards as per ISO9001 and J 4001.

Saves Lives

  • 1. Internal arc fault tested switchgear including cable compartment.
  • 2. Capacitive voltage detection system for verification of safe isolation from supply.

Increases Productivity

  • 1. All switching operations and cable access from the front.
  • 2. Safe to touch and hermitically sealed, gas tight, welded stainless steel primary enclosure, independent of environmental effects (dust, moisture, vermins etc.)
  • 3. Extensible on either sides.

Saves Money

  • 1. Single switching element for load breaking, disconnecting and earthing.
  • 2. Maintenance free operating mechanism accessible outside the high voltage enclosure.
  • 3. Most compact individual panel/ block type construction, ensuring minimum space requirement.
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Design and Construction

  • 1. Ring feeders with three position switch disconnectors (option: with auxiliary switch).
  • 2. Circuit breaker feeder with combined Vacuum interrupter Dis-connector and earthing switch.
  • 3. Capacitive voltage detection system for all feeders.
  • 4. Protective self-powered relay & current transformers for transformer protection.
  • 5. Individual panel / block type construction.
  • 6. Manual operating mechanism (option: with motor).
  • 7. Cable connection from front.
  • 8. Logical mechanical interlocks.
  • 9. Gas pressure monitoring via Manometer.

Options:

  • 1. Short circuit I earth fault indicators for ring feeders.

  • 2. Shunt release for VCB feeders.

  • 3. Motor-operated ring & VCB feeders.

  • 4. Local/remote selector switch for motorized feeders.

  • 5. Provision for two runs of cable connection max Up to 3Cx300 sq.mm.

Technical Data

Rated Voltage 12 kv
Rated Frequency 50 Hz
Rated Current
Busbar 630A
Rated Power
Frequency Withstand
voltage (rms), 60 sec 28 KV
Rated Lightning Impulse withstand voltage (peak),1.2/50ps 75 KV
Rated short time
withstand current, 3sec 28 KA
Rated short time making
current including earth
Switch 50 KA
Degree of protection
HV enclosure IP 67
Indoor enclosure IP3X
Outdoor enclosure IP 54
Standards
Switchgear IEC 62271-200
IEC 62271-100
Disconnector switch IEC 62271-102
Earthing switch IEC 62271-102
Load break switch IEC 60265-1
Current transformer IEC 60044-1
Capacitance voltage detection IEC 61243-5
Degree of protection IEC 60529
1 Option 38Kv 2 Option 95kV

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