Sabtron Transformers & Electro Equipments Adugodi, Bangalore, Karnataka

We are offering variable transformer box, our ranges of transformers are from 2 amps to 300 amps in single coil and above that with gang coil through the balancing coil. We make up to 60 amps both air-cooled and oil cooled models whereas above 60 amps in oil cooled models only. Moreover, as per client’s specifications, we also offer double layer winding capacity up to 5 kva especially for the manufactures of servo controlled stabilizers.

We are offering variable transformer, our ranges of transformers are from 2 amps to 300 amps in single coil and above that with gang coil through the balancing coil. We make up to 60 amps both air-cooled and oil cooled models whereas above 60 amps in oil cooled models only. Moreover, as per client’s specifications, we also offer double layer winding capacity up to 5 kva especially for the manufactures of servo controlled stabilizers.

Precautions &safety ac power supplies and dc power outputs are sources of high voltage. Improper or careless use could result in fatal electrical shock. Observe common sense safety precautions when using this dc variable power supply input power these instruments are intended for use with 240v, 5060hz phase to neutral line voltage. But don’t use this power supply in case of above 10% line voltage & variation in the input voltage will reflect the output voltage. ventilation the provision of louvered holes in the enclosure to provide cooling. Do not block these holes or locate this device near heat sources. Excessive temperature buildup inside the unit can cause failure and a potential hazard. maximum output voltage the output voltage of the ac power supply is adjustable from 0 to 300 vdc. It should be noted that this is higher than the maximum recommended input voltage of most electronic devices. The voltage setting of this unit should not exceed the device manufacturer ratings as potential damage could occur. Most ac powered equipment has a maximum input rating of 240vac. If unsure of the maximum ac voltage rating, do not exceed 240vac. maximum output current never exceed the maximum output current of this unit. Excessive current loads will damage the variable auto transformer and electronic circuit. We provide filter circuit for reducing ripple current up to 2%

Technical specifications 1 type and make of transformer a) indooroutdoor b) type of cooling c) governing specification “sabtron” indoor onan is:2026 2 rating (continuous duty) 630 kva auto 3 winding material electrolytic copper 4 frequency 50hz 5 no. Of phases 3 6 voltage between phaseneutral 0-200-240-280-290 v 7 connections star 8 vector group yao 9 terminal arrangement 13 bushes 10 temperature rise at full load over an ambient of 45 °c a) in winding b) in oil 55 °c 50 °c 11 impedence at normal voltage ratio at 75°c 1.5% 12 no load losses at normal voltage and frequency 700 watts 13 full load losses at 75°c 2500 watts 14 weights a) transformer core b) windings(copper) c) transformer oil d) tank and fitting 410 kgs 160 kgs 430 kgs(500ltrs) 400 kgs 15 total weight 1400 kgs 16 over all dimensions in mm 1300(l) x 1350(w) x 1350(h) note: all parameters furnished are subject to tolerance of +- 10% as per is

Method of operations servo controlled voltage stabilizers maintain accurate output by feedback controllingm by servo motor. the input line is connected in series with the secondary winding of a buck boost transformer. The secondary will get additive or subtract voltage induced from its primary. When the input is low, the secondary will have additive voltage to give boosted output and vice versa. the primary of this buck – boost transformer is connected to the fixed tap and variable point of the variable transformer which is connected across the input supply. the position of the variable point with respect to the fixed tap point determines the amount of primary voltage and hence the secondary voltage of the transformer which becomes additive or subtract. Thus the input is boosted or bucked by the series connected secondary wiring corresponding to the position of the variable point of the variable transformer. the variable point is driven by a servo motor in the forward or reverse directions. the forward or reverse signals is given through a controller circuit which is energized by an output sensing transformer. the controller circuit will be giving forward or reverse signals to the motor till the ouiput is corrected to the required value. as sensed by the sensing transformer if the variation in the input voltage goes beyond the specified range. the brush arm of the variable transformer will be driven to either of the ends, thus unable to correct the output further. This however is likely to cause damage to the variacs, motor etc. To avoid the same limit switches are provided at both the ends of the variacs winding so that the brush arm on reaching the end will automatically cut off the supply to the motor and prevent further movement. if the variation in the input voltage revives to within the specified range, the supply to the motor comes into function automatically to set the output voltage to its specified level also when the limit

Technical Specifications Input voltage 0-100-230 V AC+- 5% Output voltage 0-100-230 V AC +- 5% Output current 1KVA (10 Amps), 500VA(5Amps) Frequency 50 ± 3 Hz. Thermal rating 10 Amps @100 V & 5Amps @ 100V continues Line Regulation Better than +-5% Load Regulation Better than 1% from no Load to full load. Static Regulation ±1%. Mode MCB, Fuse with indicator Type of cooling Air natural cooled Operating temperature 0-40 degree C Insulation level 1.5 kV rms for one minute Transformer Copper wound Input termination Mains cord Output termination Universal socket 2 nos Type Power coated metal enclosure Mounting Nylon bush

Input: 230v+- 10%, 50hz, or 440v output type: variable single, dual, fixed, multi output output voltage: from 0 volt to different ranges output current : from 0 amps to different ranges cine regulation: better than 0.05% for the input variation +- 10% sabtron dc power supply is designed as a source for use in laboratories, industries and field testing with compact size, it provides dc output voltages for analog and digital testing.

Controls and panel layout 1. Control a. The power supply is controlled by motorized ac variable transformer with the capacity of 50 amps single phase and fine tuning controlled by 2 amps single phase motorized variable transformer b. Mcb protected in input side c. We provide zero start facility to the power supply for protecting middle operation d. Input with 8mm epoxy bushing and output with copper buzbar for each 2500 amps e. The maximum output current is directly proportional to the supply voltage. f. we provide push button switche for, switch on 2500a, cut off , increase and decrease switches for direct and fine tuning g. To select output current for 2500, 1250 amps we provide buz-bar terminations in the back side of the enclosure and link buz-bar. The direction for linking we provide drawing in the top of the enclosure operational proceedure ensure that the variable power supply is connected to the proper 240vac, 50hz single phase power source. The wall outlet must be a two-wire neutral type, with a good earth ground. Always the cable entry panel should be closed after the connection of input and output cable protect from the direct shock connect the ac power cable with sufficient power source to the input epoxy bush, it should be fully tightened otherwise it may cause to heat and fire switch on the input mcb and confirm the main indicator lamp blows, but it should be sure about the voltage is zero position that the zero start is connected. press the switch on push button for loading the current. And gradually increase the voltage with push button provides for increase and decrease the voltage. Adjust the output current to the desired level and apply the fine tuning push button to get the exact output current

We offer current injection kits which have all features in primary side variable ac voltage and secondary variable with low voltage in higher current capacity. the current injection kit produces less voltage in large current and it is primary controlled by variable transformer and secondary with step down transformer, which is used to reduce the line voltage and increase the current capacity. We also provide voltmeter, ammeter and mcb or fuse protection in primary side.

We are offering box type variable transformer , our ranges of transformers are from 2 amps to 300 amps in single coil and above that with gang coil through the balancing coil. We make up to 60 amps both air-cooled and oil cooled models whereas above 60 amps in oil cooled models only. Moreover, as per client�s specifications, we also offer double layer winding capacity up to 5 kva especially for the manufactures of servo controlled stabilizers.

Technical specifications model no & make 5sitb-3, sabtron input voltage 0-415+- 5% output voltage 0-415 +- 5% rating 5 kva frequency 50 ± 3 hz. Thermal rating 6.95 amps @230 v continues line regulation better than +-5% load regulation better than 1% from no load to full load. Static regulation ±1%. Mode star or delta type of cooling air natural cooled operating temperature 0-40 degree c insulation level 1.5 kv rms for one minute transformer copper wound input termination banana terminals with 25%,50%, 75% taping output termination banana terminals with 25%,50%, 75% taping type power coated metal enclosure mounting bushing