tender for supplying, installation and commissioning of 50 kva servo controlled (oil cooled) automatic voltage stabilizer at intake well jhajhapara, 75 kva servo controlled (oil cooled) automatic voltage stabilizer at wtp jhajhapara and allied works for ranibahal/maheshbathan group of village rural water supply scheme under d. w. & s. mechanical division dumka. , raw water p/plant -intake well at jhajapara , cost towards supplying, installation and commissioning of 50 kva servo controlled (oil cooled) automatic voltage stabilizer suitable for output voltage of 415 volt ± 1% 3 phase 50 hz with copper wound transformer as mentioned below. the stabilizer shall function satisfactorily even if incoming supply is unbalanced between phases within range of 10%. the stabilizer should be constructed in cubical box, with bidirectional wheels for easy handling necessary monitors and users controls on front panel such as indication alarm, voltmeter and selector switch for measuring input and output voltage auto manual selector switch. raise low push buttons etc. suitable capacity termination strips and bus bars for incoming and outgoing cable should be provided. all three phases shall be independently monitored and corrected. following protections and indication shall be incorporated. over voltage/under voltage single phasing cut off contactor with electronic output sensing unit suitable change over switch and earthing 50 kva oil cooled servo controlled automatic voltage stabilizer (output 415 unit ±1%) input 150/220 to 450/460 volt. (for 20 hp vt pump sets.) , first filling of t-oil as per is:335 , supply, fitting of 2 nos. 100 annual periodical maintenance four pole, on load change over switch in sheet enclosure with side handle operation with required copper cable as per direction of e/i. , clear water boosting p/plant -w.t.p campus at jhajapara. , cost towards supplying, installation and commissioning of 75 kva servo controlled (oil cooled) automatic voltage stabilizer suitable for output voltage of 415 volt ± 1% 3 phase 50 hz with copper wound transformer as mentioned below. the stabilizer shall function satisfactorily even if incoming supply is unbalanced between phases within range of 10%. the stabilizer should be constructed in cubical box, with bidirectional wheels for easy handling necessary monitors and users controls on front panel such as indication alarm, voltmeter and selector switch for measuring input and output voltage auto manual selector switch. raise low push buttons etc. suitable capacity termination strips and bus bars for incoming and outgoing cable should be provided. all three phases shall be independently monitored and corrected. following protections and indication shall be incorporated. over voltage/under voltage single phasing cut off contactor with electronic output sensing unit suitable change over switch and earthing 75 kva oil cooled servo controlled automatic voltage stabilizer (output 415 unit ±1%) input 150/220 to 450/460 volt. (for 30 hp c/f pump sets.) , first filling of t-oil as per is:335 , supply, fitting of 2 nos. 200 annual periodical maintenance four pole, on load change over switch in sheet enclosure with side handle operation with required copper cable as per direction of e/i. , add 18% gst , add 1% labour cess