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Ring Main Unit

Ring Main Unit

Your Benefits At A Glance

  • 1. Comprehensive supply of gas-insulated switchgear for secondary distribution grids.
  • 2. High cost-efficiency by climate- independent, durable and maintenance-free switchgear.
  • 3. High switchgear availability and personal safety.
  • 4. Minimized space requirements by compact dimensions.
  • 5. High product quality from one of the pioneers of gas- insulated switchgear.
  • 6. Protection of investment by possible integration in smart distribution grids.
  • 7. Reliable and competent support on site – from planning to operation.

Maximum functionality on minimum space – also for intelligent transformer substations

At a time of growing cost and performance pressure it is even more important to decide on the right technology, above all because switchgear represents an investment for the next decades.

Compactness, performance, climatic independence and cost efficiency add to the central aspects of gas-insulated medium-voltage switchgear from Siemens in order to provide a future-proof investment: optimal personal and functional safety, as well as reliable, maintenance-free operation.

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Technical features

Indoor Metal-clad Switchgear with Vacuum Circuit Breaker on withdrawable truck upto 36 kV
Rated values up to 12kV, 21kA, 3s
Rated frequency 50 Hz
Busbar current up to 630 A
Feeder current up to 630 A
Busbars Single busbar
Rated power frequency withstand voltage 28kV 38kV
Rated lighting impulse withstand voltage 75kVp 95kVp
Insulation Gas-insulated
Switchgear vessel Hermetically enclosed
Type of switchgear Factory-assembled, type-tested, metal-enclosed switchgear according to IEC 62271-200 Panel blocks consisting of 2, 3, 4 or 5 panels

Technical features

Calssification according to IEC 62271-200
Partition class PM
Loss of service continuity category LSC 2
Accessibility to compartments Busbar compartment: Non-accessible Switching-device compartment: Non-accessible Cable compartment: Interlock-controlled
Degree of protection For switchgear enclosure [Indoor]: IP3X For switchgear enclosure [Outdoor]: IP54 For gas filled vessel: IP65
Internal arc classification IAC A FLR 21kA, 1.0s
Dimensions
Block width depending on number and type of panels 645mm, 955mm, 1265mm, 1575mm
Panel height 1620 mm
Panel depth Bottom explosion: 820 mm Top explosion: 918 mm
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Standards

Switchgear IEC 62271-1 IEC 62271-100
Devices Circuit breakers IEC 62271-200
Disconnector & earthing switch IEC 62271-102
Switch-disconnector IEC 62271-103
Voltage detection systems IEC 61243-5
Degree of protection IEC 60529
Insulation IEC 60071
Instrument transformers Current transformer IEC 61869-2
Voltage transformer IEC 61869-3
Installation, erection IEC 61936-1

Construction

Peace of mind

  • 1. Gas insulated, metal enclosed, indoor/outdoor, Extensible/non- extensible factory assembled type tested switchgear as per new IEC 62271-100/200.
  • 2. Stringent quality standards as per ISO9001 and 14001.

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.
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Saves Mone

  • 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.

Options

  • 1. Short circuit / 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.

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.

A complete solution provider for eletricity distribution