PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
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Auto Transformer Starters :<br />
The auto transformer starter shall be of the fully automatic type. For auto<br />
transformer starting, magnetically operated starting, accelerating and running<br />
contactors shall be provided either, operating under solid state or electronic timing<br />
devices. The auto transformer shall limit the starting current to 1.5 times full load<br />
current for motors upto 100 HP and 1.25 times full load current for motor<br />
above 100HP with appropriate tapping. The auto transformer shall be provided<br />
with one under voltage coil, three magnetically operated overload coils, and a<br />
single phasing preventor relay. One ammeter of ample capacity to take care of the<br />
starting current shall also be provided in the starter. The starter in general confirm<br />
to IS:13947 Part 4 – Sec 1 (IEC 947-4-1 -1990).<br />
Soft Starters:<br />
The Low Voltage Soft Starter for Pump motor will be flux compensated magnetic<br />
amplifier type suitable for voltage 10%, 3phase/50hz 5%. The soft starter shall<br />
be rated equivalent to the motor rated power and shall be capable of operating<br />
satisfactorily with the motor under the various loading and starting conditions of the<br />
motor over the entire operating range. The soft starter shall reduce the starting<br />
current of the motor at least to 150% of full load current of the motor. The soft<br />
starter shall be so rated as to allow six starts per hour.<br />
The soft starter shall work on the principle of full sinewave control and shall not<br />
lead to generation of harmonics.<br />
The three phase windings of the Soft Starter shall be with insulation class H and<br />
Max. Temperature of winding shall be limited to that of class B. FCMA should<br />
have iron core. FCMA coils should be Epoxy-cast resin. The FCMA unit should be<br />
Air Cooled and dust and vermin proof and suitable for indoor mounting.<br />
The FCMA Soft Starter shall be housed in a sheet steel enclosure of thickness not<br />
less than 14 gauge and painted with corrosion resistive paint such as epoxy or<br />
Polyurethane. The degree of protection shall be IP.41. Soft Starter shall have a built<br />
in facility for run bypass so that the in coming voltage to the motor is equal to the<br />
supply voltage.<br />
GTS : General Technical Specification. Page 113
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