Ac Voltage Stabilizers
| DESCRIPTION |
|
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 ManualMode). |
| • | Operation - Auto or Manual. |
| • | LED Indications for Input Voltage 'High' / 'Low'. |
| • | Metering (Analogue or Digital) - AC voltmeter with / without selector switch. |
| • | Non-standard requirements can be catered to, such as AC Ammeter, Frequency Meter, PhaseSequence Meter, Single Phasing Preventer, Stabilizer by-pass arrangement, etc. |
| ELECTRICAL SPECIFICATIONS | ||
| • | MODEL | EMS - 12 |
| • | TYPE | Indoor, Floor Mounting. |
| • | COOLING | Air - Cooled / Oil Cooled / Air - Oil Cooled. |
| • | INPUT | 160 - 260V / 180 - 250V, 1 Phase AC. 300 - 460V / 360 - 460V, 3Phase, 4 Wire (or 3 Wire if required) AC (Balanced or Unbalanced). |
| • | OUTPUT | 230V / 240V ± 1%,1 Phase AC. |
| 380V / 400V / 415V ± 1%, 3Phase AC. | ||
| • | CAPACITY | 1 kVA - 2000kVA |
| • | FREQUENCY | 50 - 60Hz. |
| • | INSULATION RESISTANCE | Not less than 5 Mohms at 500V DC |
| • | DIELECTRIC TEST | 1.5kV RMS for 1 minute. |
| • | OPERATING TEMP. | 0°C to 50°C |
| • | STORAGE TEMP. | - 9°C to 70°C |
| • | HUMIDITY | upto 95% RH |
| • | CONFORMS TO | I.S.9815 |
| NOTES : | |
| • | Input & output voltages, other than specified above, are available on specific request. |
| • | For 3 Phase balanced supply system, a common controller, connected to any one phase is employed. |
| • | For 3 Phase unbalanced supply system, 3 individual & independent controllers, one for each of the 3 Phases, are employed. |
| • | Oil should be 'Transformer Oil' Conforming to IS 335, I.E.C. 296. |
| MECHANICAL CONSTRUCTION |
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| APPLICATIONS | |
| CNC Machines, Air Compressors, Textile Machines, Lightings, X-ray & Medical Equipments, Engineering Units, Computers, Pump Sets, Transmitters & many other similar applications. |
| Ordering information | |
| • | Model |
| • | Type |
| • | Cooling |
| • | Input Voltage (Balanced or Unbalanced) |
| • | Output Voltage |
| • | Capacity (kVA) |
| • | Protections (if required) |
| • | Non-standard metering. |
| • | With / without first filling of oil (only for oil cooled units). |