Generator Specifications - Yemen Mobile

1 1 Generator Specifications 1-General This specification covers Diesel Engine driven electric generating alternators, 380/220 Vac 10% ,3ph,4 wires ,50HZ ,1500 rpm , continuous out put rating 15kVA, and PF at altitude 2200m ASL and 40C , weather proof canopy outdoor unit. To supply the telecommunication services as an automatic units. It shall feed BTS stations through electronic thyristor based rectifiers regulated. In addition, they shall feed single phase and three phase air conditioners, single phase lights, fans etc. The tenderer shall provide evidence that similar equipment has been supplied and given satisfactory service . A list indicating the places where such equipment are in operation shall be furnished . Sites conditions The derating for electric power Generator sets shall be provided at following conditions : Altitude: up to 2500m ASL Ambient Temp.

2 : from -10 to 450 C Humidity : up to 90% Derating tables and curves shall be supplied by the tender. 2 2 Engine 1500 RPM , industrial type, air cooled, in-line arrangement, direct injection, 4 stroke and anticlockwise rotation , oil pressure protection should be a switch normally closed and temperature protection as a switch normally closed that be provided.(normally close switch : that means it's contact still closed at normal operation and don t changes to open except in case of related fault exist) Oil and Temperature analogue readers - sensor (VDO) type 2 3 cooling system Air cooled system , centrifugal fan shall be heavy duty, anti-corrosion , easy to maintain , and shall be sized for continuous full load. Belt fan switch shall be include. PDF created with FinePrint pdfFactory Pro trial version 2 4 Fuel System Fuel injection pump with fuel lift pump and full flow replaceable filter plus separate preliminary fuel filter and electric fuel solenoid should be provided.

3 The tenderer shall furnish details of fuel injection pump, fuel consumption at full load and at varying loads. Flexible hoses shall be used for connections to the input and output. Fuel drain must be connected to an external outlet. All fuel-lines before the cut off valve (Solenoid) shall be fireproof. 2 5 Lubrication Full pressure lubricating oil system, including an oil cooler, is to be fitted. The tenderer shall indicate the frequency of changing oil. 2 6 Mechanical Type Governor Under steady state conditions , whatever the load be , the rotational speed shall remain between N and N , where N is the normal speed in the event of a sudden load variation of l nominal , but with the load remaining between L and L nominal , m Where L nominal is the rated load , the instantaneous change in speed should not exceed 4% of N . The rotational speed should then be returned within offset limits is less than 3 seconds and stabilize in less than 8 seconds.

4 The tender shall enclose graphic diagrams showing the derating of his units depending on altitudes , temp. and humidity varying . 2 7 service and power rating The engine shall be selected for a 1000 h continuous power condition, unless otherwise stated, such that its capacity is adequate to drive the associated alternator and accessories continuously at rate output at an altitude of 2200 m, air temperature of 40 C and relative humidity of 90%. 2 8 Exhaust system Exhaust system shall be provided with high standards and weather conditions. The outside exhaust system be manufactured from stainless steel materials. 2 9 Air Filter Air Filters Shall be dry type, heavy duty, with replaceable elements. The efficiency of the system at various stages shall be furnished. 2 10 Engine Safeguard Oil protection shall be offered as standard.

5 The system shall be arranged for fail-safe operation by de-energizing a solenoid coupled to the fuel injection pump PDF created with FinePrint pdfFactory Pro trial version with shutdown protection against high cylinder temperature, low lubricating oil pressure, coolant temperature, belt failure, or any other fault. 2 11 Flexible Coupling A heavy duty flexible block coupling shall be fitted between the engine and the alternator to absorb the transmission of shock loads . details should be offered by the tender. 2 12 Batteries The battery shall be fitted on the vibration free main chassis complete with all the necessary acceessories ,flexible interconnecting cables and lugs. The battery shall be heavy duty, free maintenance type with suitable capacity to be enough for current cold starting (CCS) at the worst conditions. The battery is to be supplied in a dry-charged condition securely placed on a rack.

6 The battery shall be kept in good condition for starting the gensets and shall be adequately charging either from mains supply and / or from the genset supply through the unit control panel. 2 13 Components Guard All exposed parts of the engine and alternator accessories shall be fully guarded . Guards shall be all arround the coupling , Generator air intakes, and any rotating parts. 3 Alternator 1. The alternator shall be brushless type , class H, design of welded steel construction, three phase , four wire, screen protected ,star connected rotating field, salient pole, self excited, self regulated type. 2. The overload characteristic should be able to handle (300%) or more of the rated power of the alternator for at least 10 seconds and 110% of rated power continuously for at least one hour every 12 hours . 3. Alternator shall withstand short circuit fault conditions without any damage with full protection against abnormal conditions.

7 4. All protections shall be in details by the tender. 3 1 compliance All specification Shall comply with Standard Specifications British 2613 or German VDE 0530 or French NFC 51 100 and 112, or the recommendations of the International Electrotechnic board. The standard applied shall be mentioned in the offer . PDF created with FinePrint pdfFactory Pro trial version 3 2 Excitation System Permanent magnets (PMG) in exciter field is prefered (for fast voltage build up both after a short circuit and also after a long time of inactivity). Self excitation is acceptable, if it gives fast voltage build up both after a short circuit and also after a long time of inactivity. The exciter technique shall be technically described in full details by the tenderer . 3- 3 Automatic Voltage Regulator(AVR) Under Steady state conditions, the output voltage should be held to within + 5% of nominal for all load values and for any power factor between and 1 , whatever be the alternator temperature.

8 Schematic diagram for shall be provided . The AVR full technical data shall be provided . 3 4 Wave shape The output waveform should be pure sine. The residual harmonic percentage between full load and no load should no exceed +5% . 3 5 Sensing Dangerous Conditions Sensing electrical conditions which might cause damages to the Generator high and low output voltages and frequency and sudden severe phase unbalance . In such circumstances and any fault electric problem the control equipment shall immediately isolate the Generator from the load, stop the diesel engine and raise an alarm. 3 -6 Wiring and Conduits Engine and alternator Control wiring shall be multi-strand annealed copper conductor encased by cross-linked Polyethylene insulation resistant to heat, abrasion, oil, water, antifreeze, and diesel fuel. Wiring shall be suitable for continuous use at 120 C (250F ) with insulation not brittle at -50C (-60F ).

9 Cables shall be enclosed in nylon flexible conduit which is slotted to allow easy access and moisture to escape. 3 7 Finish (a) The engine color shall remain the original colour as supplied by the manufacturer. (b) Rubber hoses used on lubricating oil or fuel systems and rubber belts shall not be painted. (c) Rubber material, which is not fire or fuel proof, is not acceptable. PDF created with FinePrint pdfFactory Pro trial version 4 Generator Control Panel ( ) 4 1 The control panel shall be fitted on the Generator set to work as the following: a) Automatically starts up the Generator set when the voltage of the triple phase public supply ( mains ) goes outside and of its nominal value , or when main frequency goes outside the limit of 46 and 52 Hz , and when there is a phase messing or phase sequence reversing . b) Automatically checks on diesel engine, electric alternator, and all Generator set main devices by means of appropriate devices and fitting.

10 C) Automatically cuts off the Generator set when the signal come from ATS to stop the Generator set for any reason (for example : mains voltage is restored to nominal voltage and frequency) , and automatically , it stops the genset for any abnormal action . d) Operation, monitoring, measurements and protections processes should be done by using electronic card. It's preferred to be DEEP SEA type. The card shall contain The following functions: Operation mode selection : The card shall contain at least three operation modes: 1- Auto operation mode 2- Manual operation mode 3- Test operation mode Monitoring, display and protection functions : 1. Ac (line line / line neutral) Voltage values monitoring, display and protection. 2. Ac Current values monitoring, display and protection . 3. Frequency values monitoring, display and protection. 4.