INSTALLATION: H.T & L.T SWITCH GEAR & METERING PANEL:

INSTALLATION:

H.T. SWITCHGEAR & METERING PANEL:

All standard checks of the equipment before installation shall be done by the Contractor and unit shall be installed and tested as per direction of the manufacturer and Consulting Engineer. Required finishing work shall be done by the Contractor and hooking up the unit with the system shall also be within this contract. Consumable materials required for complete installation of the equipment including cables compound, boxes etc. shall be supplied by the Contractor. After complete installation be unit shall be tested by the Contractor upto the satisfaction of the Consultant and the Engineer-in-charge.

All accessories shall be installed as per direction of the Manufacturer and the Consultants. If the equipment is damaged during handling and installation. The Contractor must repair the damage or replace the damaged parts at his own cost,

TRANSFORMER:

The Transformer  equipments  should  be  checked  before  installation  by  the  Contractor   and installed and tested as per direction of the Manufacturer and  Consulting Engineers and Engineer-in-charge / Consultant.

Required finishing work shall be done by the Contractor and hooking up the transformer with the system shall also be within this contract. Consumable materials required for complete installation including cable compound boxes etc. shall be supplied by the Contractor and the rate quoted shall be inclusive of all incidental expenses. Care should be taken during carrying  the transformer and its related parts. if there is any damage during handling and installation the Contractor will be liable to replace the damaged parts at his own expenses. After complete installation the transformer must be tested and commissioning as per direction of the Engineer-in-charge / Consultant, Manufacturer and Consultant.

L.T. SWITCHGEAR:

All L.T. Gear equipment must be installed on proper foundation. All consumables required for the complete work shall be supplied by the Contractor. The work shall be complete with all internal electrical connections. After complete installation of the panel the Contractor should test the complete L.T. Gear equipment as per manufacturer specification and direction for full satisfaction of the Consultant and Engineer-in-charge.

CAPACITOR:

The item includes supervision of installation of capacitor on prepared foundation. The foundation is to be prepared by   Contractor as per direction of the Engineer-in-charge / Consultant. All consumables required to install the equipment shall be supplied by the Contractor. After completion of the installation the Contractor should test the equipment in presence of Consultant to his satisfaction.

EARTHING SYSTEM:

The work under this item shall consist of supply and installation of earth electrode  with copper lead, earthing inspection pit and connecting to the specified terminal according to the drawing,  specification and direction of the Engineer-in-charge / Consultant. The whole electrical system including light, fan, regulator sockets sub-station and metal parts incorporated with building electrification shall be earthed.

The earth resistance of the electrodes system shall be to the satisfaction of the local supply authority and shall not exceed in one ohms.

Materials :

Earth Electrode :

The earth Electrode in a 1 and 1/2” dia, G.I. pipe with 3/16th inch. dia drilled holes.

The G.I. pipe shall be similar to the specification.

The pipe earth electrode shall be sunk and buried below ground level upto its full length or as advise by the Engineer-in-charge / Consultant. The earth lead and be connected to the earth electrode by brass/G.I. clamp.  After making connection the clamp shall be covered with bitumen poured hot and with jute cloths.

Earth lead :

Earth lead shall consist of two numbers, 2 SWG high conductive electrolytic bare copper wire meeting the requirement of B.S.S. 6360 : 1969 and/or it’s equivalent.

All earth lead shall follow the shortest and most direct route to the earth electrode avoiding sharp bend and from inspection pit to the entry at the building shall be enclosed in 1” dia G.I. pipe. The earth lead shall be connected to test earth electrodes by means of lugs, bolts, nuts and double washers to fixed as to make permanent and positive connections both electrically and mechanically. The joints shall be covered with PVC compound without disrupting the continuity.

Earth Inspection Pit :

Inspection pit shall have to be constructed over earth electrode to inspect and test the connection terminals. bricks used shall be of Ist class and only approved quality cement shall be used, Jhama brick khoa for R.C.C. cover shall be 3/4th inch down graded and washed, cleaned before casting. 3/8th inch dia M.S. Rods @ 4” c/c with two 1/2” dia M.S. Hook  shall be provided in the cover slab.

Installation :

Electrode :

The pipe earth electrode shall be sunk and buried below ground level upto its full length or as devised by the Engineer-in-charge / Consultant. The earth leads shall be connected to the earth electrode by silicon aluminum bronze body clamp and phosphor bronze screws. After making connection the clamp shall be covered with bitumen poured hot and with jute cloth.

Lead :All earth lead shall follow the shortest an most direct route to the earth electrode avoiding sharp bend and from inspection pit to the earth electrode avoiding sharp bend and from inspection pit to the entry at the building shall be enclosed in 1” dia water grade PVC pipe. The earth lead shall be connected test earth electrodes by means of lugs, bolts, nuts and double washers of failed as to make permanent and positive connections both electrically and mechanically. The joints shall be covered with PVC compound without disrupting the continuity.

Pit :

Ist class brick made inspection pit and RCC cover with Sub-Station & Diesel Generator Set Set  hook shall be built on earth electrode as described here above at the location shown on the drawings the electrode shall be within 10’-0 from the building.

Maximum Earth Loop Resistance :

The maximum earth loop resistance any point in the installation including earth lead to the earth electrodes shall not exceed the resistance specified in the schedule or that indicated by the Consultant. The contractor must ensure that the leads are efficiently bonded to all metal work other than the current carrying parts. So that the above resistance level is not exceeded. It will be the duty of the contractor to provide earth tester, test the installation in presence of the authorized representative of the authority and submit earth test report to the authority for approval.

Method of Measurement :

Measurement shall be per set of earthing system installed.

GENERATOR :

ITEM :

DIESEL ENGINE Driven A.C. generator set having a prime power output as per schedule (continuous rating) standard voltage 230/415 volts, 3-phase, 50Hz, 4-wire at 1500 rpm under condition of normal temperatures and pressures. The manufacturer must have ISO9001.

GENERAL DESCRIPTION:

The engine and alternator assembly shall be directly flanged coupled, the alternator being driven by a flexible coupling connecting engine fly wheel to alternator rotor.

The unit should be mounted together with cooling radiator on a fabricated, heavy steel frame of all welded construction designed to accurately align and support the assembly. The base frame is to be predrilled to allow for ant vibration mounts and is to be provided with special Sub-Station & Diesel Generator Set Setting arrangement for case of handling and safety purposes.

There must be arrangement for manual/ automatic battery electric start being operated from the main control panel which shall also include all monitoring and protection devices covering the mechanical and electrical systems.

DETAILED SPECIFICATION:

Diesel engine driven generating set having a continuous rated output at 0.8 Power factor at 415/230 Volts, 3-phase, 4-wire, 50Hz at 1500 RPM under conditions of normal temperatures and pressures with 10% overload for one hour at conditions specified under B.S. 5514, DIN6271, ISO 3046/1.

ENGINE:

The engine shall be of 6 cylinders, 4 stroke, Air to Air after cooled, turbocharged, pressure lubricated, direct injection, water cooled, industrial type Diesel engine developing the rated bhp at 1500 RPM, at NTP conditions.

The engine shall be complete with close control governing to BS 5514, 1979 Class A1 Fuel Injection equipment with :

a)            Fuel oil filters

b)            Lubricating oil filters

c)             Air cleaners/filters

d)            Fuel solenoid energized to run,

e)            Lubricating oil pressure pump,

f)             Water circulating pump,

g)            Battery charging generator,

h)            Precision mechanical governor,

i)              Starter motor,

j)              Fuel solenoid

k)             Thermostatically controlled by pass system

ENGINE STARTING:

The engine shall be fitted with manual automatic electric starting by means of a starter motor arranged to engage with the fly wheel.

ENGINE COOLING:

The diesel engine shall be cooled  via a  tropical air blast heavy duty radiator   with  engine driven pusher type fan, complete with water circulating pump, radiator guard, thermostat and by pass system.

BATTERIES: The unit shall be supplied with a set of suitably rated heavy duty 12/24 volt industrial type lead acid batteries (dry charged). A mains operated battery charger should be mounted in control cubicle.A set of starter cables and connections would  be supplied loose.

LUBRICATING SYSTEM:

Wet sump force feed lubrication system by gear driven oil pump incorporating replaceable oil filters.

EXHAUST SYSTEM :

The engine shall be supplied with: Acoustic type silencers, flexible bellows sections and rigid exhaust pipe of suitable length, suitable for use with Vee form engine, supplied loose for site erection. The complete exhaust system shall be designed to prevent any de-rate of the engine due to excessive back pressure. All exhaust components are to be finished with heat resistant paint.

ALTERNATOR :

Brushless Salient pole rotating field, self-exciting, self-regulating, single bearing construction with integral automatic voltage regulator providing voltage control to within +/- 2% of nominal range, no load to full load and at all power factors between unity and 0.8 lagging and with a maximum 5% prime mover speed variation.

Class H insulating on both rotor and stator windings and with enclosures to IP21 of BS 4999 Part 20, IEC & DIN standards. The alternator meets the requirement of BS 5000 and radio suppression to BS 800 & VDE class G&N.

ANTI-VIBRATION MOUNTINGS:

A set of anti-vibration mounts and spring isolator would be supplied loose for positioning beneath bed frame when the side is delivered to site. These have their own in - built leveling device  and friction pad, therefore fixing to the floor is not necessary.

FUEL SYSTEM:

The unit shall be supplied with a base mounted fuel tank in corporate in the base frame of the unit providing sufficient fuel for 8 hours continuous full load operation, the  base shall be pressure tested prior to assembly and will incorporation dial type  content/gauge,  filler cap, vent pipe, drain cock and all necessary fuel connections. All pipe terminations shall be completed during works assembly. The system shall include arrangement for low and high level alarm system of fuel. An additional daily fuel tank (self Standing) of 1500 liter capacity with automatic supply type including level switch & pump.

FUEL TRANSFER:

A set of rotary type hand pump would be supplied with 3 meters of flexible pipe, suitable for manual fuel transfer to the daily service fuel tank.

COUPLING:

The alternator casing would be flange mounted to the engine flywheel housing and the rotor shaft, coupled to the engine flywheel through a flexible element to minimise torsional vibration throughout the operating range.

BASE FRAME:

The engine and alternator would be mounted on a fabricated steel type base frame of welded construction adequately designed to resist bending and torsional forces. The base frame shall accurately align and support the assembly and shall provide Sub-Station & Diesel Generator Set Setting points and location points for securing to the foundation.

SWITCHGEAR:

Switchgear and instrumentation shall be mounted in totally enclosed, stove enameled sheet steel, set mounted control panel fixed to the saddle frame of the alternator by means of rubber anti-vibration mounts. The panel shall have provision for BBT connection.  The control panel would have access to all internal components and include the following:

1-            OFF/MANUAL/AUTO selector switch.

1-            Frequency Meter.

1-            Volt meter (0-500V) with selector switch (six positions)

3-            Ammeters (0-1000A) with selector switch.

1-            1000A TP circuit breaker with adjustable thermal and adjustable magnetic trips.

1-            Battery charger indicator with ammeter.

1-            Key start switch

1-            Hour run recorder

1-            Set of relays and timers

1-            Set of cartridge type fuse

1-            Set of output terminals

1-            Set of indicator lamps for fault indication of Low Oil pressure, High Engine Temperature Gauge, over speed, Overload and reverse Power relay, over crank.     

1-            Fault protection reset switch and 1- buzzer to draw attention.

The Control Panel would be complete with all internal wiring cables and accessories necessary for satisfactory operation and maintenance. The control system should be manually reset once the fault is rectified. All the failure circuits must incorporate a “Press to Test” facility which when operated will remove the fault and shut the generating plant down.