Electronics instruments, Machines, Computers and other microprocessor based equipment are designed to operate on steady stream sine wave of 220/230 V RMS. The nature of utility power is such that very frequently the equipment encounter electrical disturbances and voltages which are beyond the range of those equipment. The quality of power has deteriorated so much during the past several years that today it is impossible to work without encountering disturbances. Equipment using microprocessors are especially vulnerable due to the degradation of the utility power.
The equipment when plugged into the wall socket outlet are normally located a good distance from the building service center ie. The place where the power meters are located.
Thus in order to reach the equipment potentially damaging impulses generated outside your location travel through the impedances of lot of copper wire. Although this barrier serves to dampen out many of these disturbances the real problem occurs along the electrical path from the point the power enters your premises to your equipment. Between these points are all kinds of devices such as lifts, air conditioners, Fluorescent tube chokes, Photo copiers and in case of factories the machines. Any equipment that arcs, cycle on off, or draws excessive bursts of current becomes the cause of potential hazard to your micro processor based equipment..
The Solution :
Purevolt's CVT has been designed to give you total protection against power related problems and to condition the power to suit the needs of your microprocessor based equipment. It effectively regulates voltage variation, suppresses transients (ISOLATION) and bridges the short interruptions/dips.
Rating : 250 VA to 10 KVA
In our Constant Voltage Transformers - CVT, the AC mains power the input winding, which is widely separated physically from the isolated output winding. The input winding normally runs at very moderate Flux linkage levels. The output winding exhibits an intrinsic energy characteristic and this energy storage operate in conjunction with mains capacitor to produce self-generated AC flux Field which is indirectly extracted from the Input Winding.
These Constant Voltage transformer or CVT use a tank circuit composed of a high-voltage resonant winding and a capacitor to produce a nearly constant average output with a varying input. The ferroresonant approach is attractive due to its lack of active components, relying on the square loop saturation characteristics of the tank circuit to absorb variations in average input voltage.
The CVT action is a flux limiter rather than a voltage regulator, but with a fixed supply frequency it can maintain an almost constant average output voltage even as the input voltage varies widely.
All problems related to variation / fluctuation in Voltages is effectively handled because of this principle and a constant voltage output of ± 1% is given.
Rating : 250 VA to 10 KVA
General Technical Specifications of our Constant Voltage Stabilizers CVT
180 V – 260 V AC
220 – 230 V ± 1%
Output Step Load Response
2 cycles (30 to 40 milliseconds)
90% (approx) under full load conditions
Output Wave Form
Wave from Distortion
5% (approx) under full load conditions
Load power Factor
0.75% lag to 0.9% lead
-10°C to 50°C
Effect of Frequency
1.6 (approx) change in output voltage for every 1% change in line frequency
APPLICATION for Constant Voltage Stabilizers CVT
Computers, Data Processing equipment, Colour Photography Labs., Bio-medical equipment, PA equipment, Telecommunication, TV, VCD/DVD recorders & players, Teleprinters, Fax machines and all other sensitive electronic devices.
The Result of Constant Voltage Regulators CVT :
Instantaneous Voltage regulation. No effect of input Transient and spikes on the output. Sinusoidal output waveform. A perfect answer and remedy for all types of electronic equipment. Our CVT have been designed to give you total protection against power related problems and to condition the power to suit the needs of your microprocessor based equipment. It effectively regulates voltage variation, suppresses transients and bridges short interruptions/dips
Salient Features for Constant Voltage Regulators :
•No Semiconductor or moving part used, hence very high reliability.
•No feedback control used.
•Intrinsic current limiting and short circuit protection.
•Energy storage for line loss up to main 3ms at typical load.
•Short term over load capacity.
•Higher input voltage control range for load less than rated low.
We are manufacturer and exporter of various types of CVT which are Ferro resonant types and gives Constant Output Voltages.
The ferroresonant transformers, which are also known as Constant Voltage Transformers (CVTs) or ferros, are also good surge suppressors, as they provide high isolation and inherent short-circuit protection.
The phenomenon which makes the CVT special is "Ferro Resonance". This is achieved by resonating of the output secondary coil with selected high stability capacitors. This resonant circuit is so dimensioned that the secondary part of the transformer core is separated during each half cycle. In this way the output voltage of the transformer is nearly constant even for large variation in the Input Voltages. By design Purevolt's CVT has sinusoidal waveform. All problems related to variation / fluctuations in Voltages are affectively handled because of this principle and a constant voltage output of +- 1% is given by Purevolt CVT.
The ferroresonant action is a flux limiter rather than a voltage regulator, but with a fixed supply frequency it can maintain an almost constant average output voltage even as the input voltage varies widely.
In our ferro resonant type transformer or cvt the primary and secondary/sides are separated by large air gap and a magnetic shunt. The combined inductance and capacitance are radically reduced because of this and thereby it gives an effective protection against asymmetric voltage transient. There also exists a phase difference between the input and output voltage in Purevolt CVT. the phase shift varies with the magnitude of load and change in line voltage and helps in suppression of noise. The isolation between the primary and secondary strips away the high frequency components of the normal mode noise and the neutral to ground bonding on the secondary side causes a short circuit for the common mode noise.
Short Interruptions & Dips:-
the output of the cvt is taken from the saturated secondary section of the transformer which has an energy reserve close to 5 -10 ms at full load. This feature is responsible for bridging the small interruptions and large dips in line voltage. i.e. for small duration of power breaks (caused because of phase compensations, switching On/Off of heavy electrical equipment, the Purevolt CVT continues to deliver power from its own energy reserve.