Constant Voltage Transformer Unit

Overview of the constant voltage transformer unit (CVT)

It saturates the second iron cores in the transformer due to residual currents from the leaked reactance and condenser by combining the condenser at the output terminal and leaked ferroresonant transformer and improve the power by generating constant output voltage against fluctuation on input voltage.

It is so-called “ferroresonant transformer” and the structure consists of serial reactor winding and saturated reactor winding into a single iron core.

Use

The product improves electricity quality as a safety production to safely use electronic devices and equipment sensitive to electricity quality in an environment with very vulnerable electric quality.

The factors degrading the quality include instant blackout, impact voltage, sag, surge, noise, instant high voltage, high voltage, low voltage, waveform distortion, and voltage distortion.

Its main applications are as follows.

* Power for telecommunication devices

* Instrument

* Medical device

* OA equipment

* FA equipment

* Electric protection facilities in areas with frequent lightning

Features

- Perfect voltage compensation for blackout (0 V at one cycle)

- Remove harmonics propagated from the output load

- Perfectly protect equipment malfunction due to electric distortion

- Respond to instant sag

Performance comparison issued by the IEEE standard 1100–1999

CTV UPS( X : No function, O : perfect improvement, ? : partial improvement)

Surge ? O ?

Noise X O ?

Notches X O O

Voltage distortion X ? ?

Sag X ? O

Swell X O O

Undervoltage X O ?

Overvoltage X O ?

Monentary interruption X X O

Specification

- Capacity: 250 VA, 500 VA, 750V A, 1 kVA, 2 kVA, 3 kVA

- Input: 100 V, 220 V 60 / 50 HZ (80–110V and 190–260V) -10% and +20% of the rating voltage

- Output: 100 V, 220 V

- Stability: within ± 2%

- Deviation: less than 2% for one output and 3% for two outputs under rated load

- Response speed: Less than 40msec (surging input voltage)

- Efficiency: 250 VA 80%, higher than 500VA: 85%

- Notch: less than 5% with waveform calibration circuits, 25% for without circuits

(Transformer specification: Iwata Kosan of Japan)