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Master Control Facility – Hassan Door Cable compartment Bus duct : Doors shall be with concealed hinges and flush type locks. : Doors that are bolted for busbar chambers should be flush in design such that the bolt head and the door surface are in one level. : Doors shall be of 2 mm thick CRCA sheet. : High quality door gasket should be used for dust and vermin proof. : Each bolt shall have plastic washers on the inner side of the door such that the bolt will remain with the door on removal of the door. : The switch handle shall be interlocked such that the door of enclosure cannot be opened unless the switch is in OFF position, however, mechanical interlock defeat mechanism has to be provided. : All rear doors shall be of hinged type with locking arrangement at three places (top, middle and bottom). : All horizontal and vertical bus bars chamber covers shall be of bolted type. : Hinged doors shall be provided for all switchgear compartments. : Stiffeners are to be provided for all rear doors for mechanical strength. : Cable entry gland plates shall be provided at the bottom. : Each gland plate shall be chrome plated with 3mm thickness & adequately supported. : Independent, detachable gland plates for each cable considering 2 cables / outlet shall be provided at the cable compartments & terminal chamber. : Liberal space shall be provided in the cable compartment as well as switch compartment to facilitate termination of cables. : Provision shall be made for proper clamping of the cables above the glands and cable clamps to avoid weight of cables acting directly on the termination. : Wide cable alley shall be provided for easy bending and termination of cables. (Bending radii =R>=12 x overall diameter of cables) : Non-segregated, bus ducts having 3 phase & neutral bus bars housed in common galvanized zinc sheet metallic enclosure. : Degree of protection for the bus duct shall be IP 54, outdoor bus duct section shall be of double roof type. The top cover should be of rain canopy type. : Busbar material –High-purity electrolyte Aluminium confirming to latest IS standard. : Bus duct rating shall be 2000A at 415 VAC, 50 Hz. : Short circuit withstand capacity –50 kA (rms) for 1 sec, Confirming to IEC IS-8623-2. : Insulation material –PVC sleeved of suitable class & insulation. : Neutral bus bar rating shall be 50% of the phase cross section. : Earth busbar of tinned copper size 35 x 4 mm shall be fitted outside the duct on either side through out the length. : Bus duct enclosure shall be fabricated with CRCA electro galvanized, 1.8-mm thick sheet with epoxy polyester powder coating, inner surface to be painted with flame proof fire retardant paint. : Transformer terminal to be connected with flexible joints to the palm connector through bi-metal shim. : All supporting structure materials shall be of GI (hot dip). : Standard accessories to be used as per the system requirement like, expansion joint at every bends, phase cross over, rubber bellow, marshalling cabinet, adopter at transformer and panel end & wall frame. : The total requirement of indoor & outdoor bus duct length will be provided at the time of approval of GA drawing. Semi Modular substation LT panel –Specification 3
Painting Surface treatment Type External Finish Internal Finish Master Control Facility – Hassan : Triple surface treatment Phosphating, Electrophoretic dipcoat-priming and Powder coating : Epoxy polyester powder coated : Mat or Gloss : Flame proof Fire retardant paint Color : Outer surface of the panel –Siemens gray. (color code IS: 952) : Plinth –Black : Inner surface of the panel –Fire resistance paint. : Bus duct – Siemens gray (color code IS: 952) Busbar System Material : High-purity electrolyte Aluminium complying to IS 5082-1981, 63401-WP Confirming to : DIN 1759, DIN 40 500 and relevant bus bar IS standard Ele. Conductivity : 100% as per IAC Standard Main busbar rating : 120 % of 2.0 MVA, continuous current rating Distribution busbar : 120 % of the switchgear rating connected N –busbar rating : 50% of the phase busbar rating Busbar system : TPN-E Busbar arrangement Phase sequence Normal service condition : If the number of busbars per phase exceeds more than three, then interleaved system shall be adopted. The phase sequence will be N-R1- Y1-B1-R2-Y2-B2 to minimize skin, proximity, power loss and temperature rise. : The phase sequence of buabars arrangement shall be N-R-Y-B from rear to front. : Should not raise 40 0 C above ambient temperature as per IS 4237 (Considering Max ambient air temp. not exceeding 40 0 C at an altitude 992 MSL) Auxiliary Busbar System Material : High-purity electrolyte Aluminium complying to IS 5082 -1981, 63401-WP Size : As per design requirement. Control power : 24 VDC & 230 VAC Location : Top front or rear top front chamber of the panel. Supports / tap-off : Integrated busbar supports and tap-off system shall be adopted. Safety : Auxiliary busbars shall be insulated & sleeved. Bus bars supporting insulators Material : Self-extinguishing moulded Fiberglass reinforced thermosetting plastic or equivalent. Properties : Higher mechanical strength, High dielectric strength : High temperature with stand capability, Non flammable : Non hygroscopic & Ribbed construction to prevent tracking Supporting : Individual supports for each phase shall be used to eliminate risk of tracking between phases. Busbars protection Separate chamber : Horizontal and vertical busbar should be enclosed in a separate chamber. Sleeving : Horizontal busbars, vertical busbars, switchgear input busbars and switchgears output busbar are to be totally sleeved with color coded heat shrunk PVC to protect against accidental contact and tracking caused by dust, humidity and vermin. Semi Modular substation LT panel –Specification 4
Page 1 and 2: Government of India Department of S
Page 3 and 4: Master Control Facility, Department
Page 5: Master Control Facility - Hassan En
Page 9 and 10: Trip circuit Indicating lamps CTs w
Page 11 and 12: Master Control Facility - Hassan Ph
Page 13 and 14: Master Control Facility - Hassan 3
Page 20 and 21: Master Control Facility. Hassan 573
Page 22 and 23: guarantee period. All tools and ope
Page 24 and 25: TECHNICAL SPECIFICATION FOR 11 kV O
Page 26 and 27: Impulse withstand voltage - 75 kV B
Page 28 and 29: 3. VACUUM CIRCUIT BREAKER Bus Coupl
Page 30 and 31: 2.4 Relative Humidity Maximum: 90%,
Page 32 and 33: voltage and frequency are subject t
Page 34 and 35: 7.1 Features: a. Auto trip on earth
Page 36 and 37: Wiring shall be terminated with pin
Page 38 and 39: 11.0 Drawing Approval 12.0 Manuals:
Page 40: 14. OPTIONAL 16.1 Monitoring and Co

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