Automatic Electric Limited

Wadala, Mumbai, Maharashtra

Product DetailsMoving Coil Instruments are protected from damage or breakage under adverse conditions due to spring loaded jewel & pivot system. These Instruments are free from external magnetic field influences because of centre magnet system and are CE certified. Voltmeters are made upto 600V for direct connection and upto 1200V with / without external multiplier with sensitivity 1000 ohms / V. Higher sensitivities are available. Scale printed for other variables viz. Speed, Temp, pH, kW, kVAR, Hz or Cos (p, etc. can be supplied on request.Ammeters with internal shunts are available upto 30 Amps and for higher currents upto 12000 Amps use external shunts of 50mV, 60mV, 75mV etc. (Please refer data sheet no. Shunt 03/99.)

Moving coil instruments with circular scale of 240 employ a platinum taut band for suspension of moving coil assembly instead of pivot & jewel system. It is less prone to sluggishness & zero shift due to frictionless movement. These meters are basically used for the measurement of DC current & voltage, and can be used with built in rectifier for the measurement of AC current & voltage in the frequency range 4565Hz. / 400Hz. The meters measure average value. It can be scaled to indicate RMS values (on request). These instruments are not recommended for non-sinusoidal waveforms of current & voltage. The other indications like Frequency, Power & Power factor can be offered with suitable external transducers. Speed indication is possible if used with AC tacho-generator (not in the scope of AE).

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 a rotating disc type instrument. The disc rotates in clockwise direction when correctly connected to incoming three phase power supply. Black arrow on white disk indicates correct phase sequence. If rotation is anti-clockwise then it indicates that one of the phases is reversed. It is suitable for use only in horizontal position and should not be left in circuit. Three, 1 meter long red, yellow, blue colour leads with clips and sheaths are provided.

It incorporates solid state circuitry with micro-controller to measure Power Factor of Single Phase and Three Phase system. Features :The Meter does not require external transducer. Hence panel wiring is reduced.__ sign indicates lagging PF (only for model PFD 65101 & 66301).Glowing of Reverse LED for reversal of current (only for model PFD 65102, 66302, 67302, 68302).

Product DetailsAE Built in Transducer type Digital Power Meter is equipped with a measuring transducer & Digital indicator. It measures Active, Reactive & Apparent power in Single Phase & Three Phase system.

Digital Panel Meter operates 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 built-in CT of 1 Amp or 5Amp for isolation.High accuracy.AC / DC signal measurement

It measures energy (Watthour) consumed by SINGLE PHASE / THREE PHASE, balanced / unbalanced load in power industry. The meter comprises of microcontroller with DIP switch provision to accommodate different CT Ratios. Features :True RMS measurement.Current direction reversal indication.Tamper-proof.No need of external auxiliary supply (Self Powered).Indication of energy by six digit, seven segment LED display.Isolated solid-state pulse output.E2 Prom memory backup for storage of energy reading during power failure.

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.

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. FeaturesInstant 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 torque.

Any Double Wound Transformer is internally an isolation transformer as the primary and secondary are isolated from one another through insulation. However, modern machines and systems need a truly isolated, clean and stable power requirement. This is ensured by an Ultra Isolation Transformer (UIT), it provides for total electrical and electrostatic isolation with most effective screening of spikes, surges and transients, further it gives a true isolated local neutral and dedicated earth which is very essential for modern machines. Ultra isolation Transformer attenuates common mode noise and transverse mode noise and provides for noise or interference free power. In principle, UIT only transfers 50 Hz. Power by transformers action through mutual inductance. It prevents transfer of RF and HF disturbances with extensive insulation between primary and secondary. The insulation levels withstands HV breakdown strength of 2.5 KV and gives a DC Galvanic isolation of above 1000 megohms.

Protective devices such as over current relay, short circuit relay, circuit breakers and CTs etc must be checked and calibrated regularly to ensure that they are always ready to operate correctly. Current injection testing sets will help detecting faulty or incorrectly adjusted protection circuit / device and thereby avoid damage to the system. With the help of current injection test sets the correct functioning of protective device / circuit is ensured. The units are available in single phase version for small capacity and single or two phase version for higher capacities. FeaturesPrimary Current Injection test set basically provided high currents ( From 100 to 15000Amps) at lower voltages (From 2V to 10V)Continuously variable outputs (0 to rated current)Dimmerstat (Continuously Variable Voltage Auto Transformer)Double wound loading transformerBuilt in Analogue Ammeter with C.T.Time Interval Meter from .0001 sec to 9999 sec (auto ranging facility) Optional

Natural Air cooled transformers are supplied in sheet steel ventilated case, with screwed top cover. Input and output terminals are provided on the top side of the transformer, inside the Terminal Box. Cable entry holes are provided on the bottom side of the Terminal Box. The transformers are suitable for floor mounting and are also supplied with M.S. Rollers for easy portability in case of large size transformers. Natural oil cooled transformers are supplied in M.S. tanks. In some cases, the tanks are provided with cooling radiators on two or all the four sides. As a standard practice, the tank is provided with oil fitting hole with cap, oil level indicator, drain plug, and earthing terminals. Input and output terminals are brought out generally on two opposite sides, either from the sides of the tanks or from the top of the tank. Plain unidirectional M.S. rollers are fitted on M.S. channels for base mounting. AE also supply transformers in open execution, without any enclosure, when they are to be mounted inside a control panel or a cubicle. The description given below are for single phase, three phase and three phase to single phase double wound transformers. It is valid only for double wound transformers and for phase voltage between 24 volts and 660 volts at a frequency of 50 Hz. For voltages beyond this range and for other frequencies will be made on request. In case of Auto Wound Transformers though the entire range falls within our regular manufacture, their details depend very much on the transformation ratio, in addition to the capacity. Therefore special quotations should be obtained in individual cases. These include single phase and three phase Star-connected transformers, auto-boosters and off-load line voltage correcting transformers

AUTOMATIC ELECTRIC LTD. introduced their indigenously developed Instrument transformers in the year 1968. Since then AE are one of the leading Manufacturers in the Country for quality Instrument Transformers. AE manufactures OUTDOOR OILCOOLED CURRENT TRANSFORMERS ranging from 11kv to 220 kv. The Modern Plant situated at Ambernath is equipped with full range of testing equipments and plant & machinery to manufacture INSTRUMENT TRANSFORMERS. AE have supplied thousands of these transformers in almost all the STATE ELECTRICITY BOARDS and Utilities in the country. FunctionsTo reduce the line current to a value which is suitable for standard measuring Instruments, relays etc.To isolate the measuring instruments. Meters, relays etc. from high voltage side of an installation.To protect measuring instruments against short circuit currents.To sense abnormalities in current and give current signals to protective relays to isolate the defective system.

RESIDUAL VOLTAGE TRANSFORMER is used to detect unbalanced voltage in three phase system and to supply voltage to directional earth fault relay. For directional full earth is necessary that the voltage applied to voltage coil of the relay corresponds in phase to that of current in current coil. Such voltage will be the Residual Voltage of the system and will be the phasor sum of the three line-to-earth voltages. Residual Voltage can be acheived by connecting secondaries of three phase V.Ts. Connected in three phase in open-delta is, however, economical to use three phase V.Ts. instead of three no.s single phase V.Ts. AE manufactures three phase R.V.Ts.suitable upto 33KkV system voltage. In normal three phase limb V.T. when one phase experiences earth fault, the resultant flux due to two healthy lines return through transformer limb of faulty line, including a heavy short circuit current in the winding on the limb.Also th voltage included in the secondary open -delta winding is not true residual voltage. To overcome this difficulty two seperate limbs are provided in the magnetic circuit of three phase voltage Transformer to form Five limb Voltage Transformer as shown in fig.No.4.