Automatic Electric Limited

It compares & reads the error due to imbalance in signals of test c. T. With reference c. T. And applies necessary proportional signal to nullify the error. Input is displayed in percentage or actual value, and phase error in centiradians or minutes. on separate key commands the error readings with date, time,% input & burden are sent either to a pc through rs232c port or to a printer connected to parallel port, in order to have report in "view format". The data read from rs232c port can be arranged by using any standard text editor, and a printout can be taken. features ? Microprocessor controlled ? Self zero check and calibration check ? Digital display of %input, ratio error and phase error ? Manual and auto ranging modes ? Test 5a and 1a ct with either 1a or 5a reference ct ? Rs 232c port and parallel port for printing ? Built in real time clock ? Parameter entry through keyboard.

Every electrical apparatus or machine Is provided with insulation between live part and earth or between two different sections of live parts. This insulation is required to be tested at high voltage values recommended by applicable relevant standards. The standard Specification for various electrical apparatus specifies Power Frequency Voltage withstand test at different levels depending upon working voltage of electrical apparatus. It is observed from the various standards for electrical equipments that the minimum power frequency voltage withstand test level for electrical insulation is 2kV for one minute. We have, therefore, standardized on manufacture of'AE' High Voltage Breakdown Testers with rated voltage of 5kV. High Voltage Tests Sets of higher voltage upto 600kV are also manufactured against specific requirement. The standard voltages are 10kV, 15kV, 20kV, 25kV, 30kV, 50kV,100kV, 150kV, 200kV & 300kV. The test sets uplo 30kV are manufactured in Air Cooled design while the sets of 50kV & above are manufactured in Oil Cooled design. The output of these high voltage testers is single phase 50/60Hz. The standard H.T. current rating of air-cooled design as also of oil cooled design upto 150kV is 100mA for 30 minutes. For voltages ranges above 'AE' make 5kV A.C. (with 2.5kV tap) High Voltage Breakdown Tester is portable, sturdy & plug in to start type construction & requires minium table space. It broadly consists of 3 main sections. 1) High Voltage Transformer 2) Variable Voltage Source 3) Control Circuit 1) HIGH VOLATGE TRANSFORMER : The High voltage transformer is single phase, single pole type & is of double wound resin moulded construction. The H.T. winding is provided with graded insulation such that one end is insulated for 2kVinsulation and is earthed through a current sensing transformer & miiliammeter whereas other end isinsulated for full rated voltage & the same brought out through H.T. Cable & spring loaded Prod. 2) VARIABLE

Maximum Demand meter is used for monitoring thermal loading in Power Distribution systems, Networks, Machines etc. It indicates maximum loading current over a period. Short-period current peaks are not registered but long overloads are registered. In the Maximum Demand meter the measuring current flows through the bimetal spiral which is temperature sensitive. The free end of the spiral is connected to a black measuring pointer. The moving system is activated by heat generated by the current flowing through the spiral. The instrument is provided with an additional red slave pointer with a higher friction, which makes it to remain at its maximum position, which determines the maximum average loading current. The high torque of metallic movement drags the red pointer along with the black pointer. The red pointer remains stationary at the maximum value reached. This can be reset by rotating the knob provided on front facia. To prevent false indication due to fluctuations in ambient temperature, an additional bimetallic spiral is wound in opposite direction, which is mounted on the same spindle to compensate variation in temperature from -10 to + 55 degrees Centigrade. Frequently there is a need to measure instantaneous current simultaneously & hence moving iron movement having the same range is incorporated in the same meter. FEATURES ? RMS measurement of maximum current. ? 20% overload capacity. ? Long current peaks are registered. ? Instantaneous current measurement. ? Red pointer to indicate maximum current reached. ? Sturdy movement. ? Analogue Indication.

The shunts are designed to comply with the requirements of is1248 / din43703 & din43780. The shunt provides an accurate d. C. Millivolt signal, exactly proportional to the system current features ? Rating 1a to 15000a ? Riveted and soldered construction ? In-line bus bar mounting ? Very low temperature coefficient ? High overload withstand ? Shock and vibration proof ? Long term stability

'ae' synchroscope is categorized into two types a) electro-mechanical and b) electronic. electro-mechanical type it incorporates a pointer and led to indicate synchronising condition. If the generator- (ii) frequency is higher or lower than that of mains- (i) the pointer rotates in clockwise or anti-clockwise direction respectively. The speed and direction of rotation depends upon difference in frequencies, which guides the operator to speed-up or slow-down the generator. Synchronising condition is determined by dark lamp method, wherein the pointer coincides with synchronising mark and the led does not glow. The led glows in accordance with difference in phase, frequency and amplitude of voltages. When the pointer is towards the bright led, it indicates the antiphase condition. features ? Rugged construction. ? Easy serviceability. ? Wide operating voltage range.

It is used to measure the applied frequency. Vibrating Reed Frequency meters indicate the supply frequency by means of individual reeds, when rated voltage ? 20% is applied across the terminals of the meter, the particular reed, whose natural frequency of vibration coincides with the supply frequency, vibrates with full amplitude. In case the supply frequency falls midway between two reeds both the reeds vibrate, at reduced amplitude. The amplitude of vibration at the tip of reeds is high enough for a distinct indication. The instrument can be operated at 110V, 220V, or 440V. Terminal screws with washers are provided for the selected operating voltage & remaining two terminals are covered with insulated caps. In case of RFD96 and RFD144 instruments, two sets of reeds with the same scale range can be offered, giving two independent meters in one casing. This facilitates in comparing the frequency of two voltage supplies for paralleling operation FEATURES ? Vibrating reed. ? No aging effect. ? Faster response. ? Lighter in weight. ? Low power consumption ? Rugged construction ? High reliability

Ae transducers convert various electrical power line parameters viz. Voltage, current, frequency, power factor, active power, reactive power, apparent power into load independent dc current or voltage output. These are used in various electrical, thermal, chemical & other power plants to monitor processed data either locally or remotely, using various devices such as indicating meters, data loggers, recorders, scada systems. features ? Open & short circuit protected. ? Current and voltage output are indendent of load impedance. ? Measurement of dc parameters

Moving iron instruments are protected from damage or breakage under adverse condition due to its spring loaded jewel & pivot system. These instruments are free from external magnetic field influences because of magnetic shielding & are 'ce' certified. These instruments have a very efficient oil damping system, which gives almost a deadbeat movement to the pointer, without irksome oscillation. The movement is light yet sturdy and has a large torque to weight ratio which assures long life to instruments. these indicate true rms values practically independent of waveform even of high harmonics. The scale is compressed initially. Readability starts from 10 to 15 degree approximately.

Features ? Filters power line noise, spikes and transients. ? Isolates sensitive equipment from noisy power lines. ? Complete with electrostatic sheilding. ? Minimizing common mode noise.

Digital panel meters operate on the principle of dual slope integration. It is available in two types i. E. 3? Digit & 4? Digit. Digital frequency meter incorporates microcontroller with crystal oscillator to display the frequency. It is available in 4 digit type. features ? Low cost. ? Seven segment red & green colour led display with 0. 5" & 1 " size. ? Ac current input is incorporated with builtin ct of 1amp or 5amp for isolation. ? High accuracy. ? Ac / dc signal measurement

Ae males rectifiers suitable for all electro - deposition process & also for battery charging purpose. These are made in air cooled or oil cooled construction. Automatic control of output voltage / current can also be provided. features ? Simple / rugged construction; in adequately thick sheet steel enclosure / tank. ? Very high efficiency for plating type rectifier - upto 86%, for battery charger -upto 80%. ? Operting temp. -45? C. ? Dimmerstat controlled / scr controlled / mag-amp - controlled. ? Very low ripple content 5% for 3ph units, can be provided better for special application. ? Various protective features like fuse protection, visual & audible alarms with tripping, can be provided.

These are basically two phase motors. Two-phase supply is normally not available, hence to operate the motors from single phase AC supply, second phase is artificially created by inserting a Capacitor and Resistor combination in series with one of the motor phase windings. Suitable combination of Capacitor and Resistor assembly is supplied along with the motor. The speed of revolution is 60 RPM at 50Hz. Instant stop & reversibility are achieved by means of a single-pole, double throw switch with center OFF position. FEATURES ? Instant start & stop. ? The motors have permanent magnet on the toothed rotor. The rotor is locked with matching teeth on stator, as soon as power is switched OFF. ? Starting & running current are same. ? Maximum Torque is 15 to 20% higher than nominal to

Servo - Controlled Automatic AC Voltage Stabilizers of 'AE' make are of 'Electro - Mechanical (EMS) type. The purpose of voltage stabilizer is to receive a fluctuating AC voltage of large amplitude & deliver an almost constant voltage, which remains within a very narrow band (? 1%) of the nominal voltage - quality of the AC voltage remains unchanged. The voltage variations, which have become a common phenomenon in current power supply system, cause havoc in modern complicated & sophisticated equipments. The voltage stabilizers are meant to take care of this problem & protect the equipments. They ensure longer life of the equipments & also drastically cut down electricity consumption of equipments leading to continuous reduction in electricity bills. Thus, they play an important role in energy conservation which is need of the day. The EMS type AC voltage stabilizer basically comprises of the following - ? Dimmerstat (Continuously variable voltage auto transformer). ? Buck - Boost Transformer (Optional upto 5kVA 1Ph / 15kVA 3Ph). ? AC Step-synchronous motor. ? Solid state electronic control circuit. ? Two switching triacs. ? MOVs for surge suppression. FEATURES ? Waveform distortion - nil. ? 98 - 99% efficiency (achieved by optimum design & by use of imported hi-quality CRGO laminations & copper of 99.9% purity). ? Speed of correction up to 70V/sec. ? Response time - less than 20 m/sec. ? Immune to load PF & supply frequency variations. ? Power loss 2% max. ? Duty cycle continuous. ? Life expectancy - 20 - 25 years. ? Easy & simple maintenance (with plug-in PCBs). ? Protections - over voltage / under voltage / overload / single phasing (optional). ? Very high reliability. ? Considerable short time overload capacity. ? Output voltage setting (by potentiometer in Auto Mode & by 'Raise' / 'Lower' Push Button in Manual Mode). ? Operation - Auto or Manual. ? LED Indications for Input Voltage 'High' / 'Low'

Dimmerstat' is registered trade mark for ae make continuously variable voltage auto-transformer. It is the most effective device for stepless, breakless & continuous control of ac voltage & therefore for various parameters, dependent on ac voltage. the basic dimmerstat is meant for operation from a nominal input voltage of 240v 1ph ac & can give output voltage anywhere between 0 to 240v or 0 to 270v ac by simple transformer action. Three such dimmerstats connected electrically in star and mechanically in tandem, become suitable for operation from a nominal input voltage of 415v 3ph ac and can give output anywhere between 0 to 415v or 0 to 470v. features ? Simple, rugged construction. ? Coils made from high grade crgo silicon steel & 99. 9% pure copper. ? Output voltage variation is smooth, continuous, breakless & linearly proportional to angular rotation. ? High efficiency. ? Negligible waveform & power factor distortion. ? Excellent short time overload capacity. ? Remote operation possible by motorization. ? Wide range of current ratings. ? High quality carbon brush used for current collection.