How do they work?
The main principle of voltage stabilisers is to perform buck and boost operations - correcting over and under voltage conditions. They can be carried out manually (using switches) or automatically (using an electric circuit).
Voltage stabilisers add or subtract the voltage to and from the mains supply.
What about constant voltage transformers?
For lower power applications a constant voltage transformer (CVT) is generally preferred over the conventional servo controlled stabilisers as they provide instantaneous power protection.
Constant voltage transformers are renowned for controlled output voltage and unparalleled reliability. They use the ferro-resonant principle and are best suited to harsh industrial environments.
Why is a constant voltage transformer needed?
There are many different technologies offering protection against power surges and sags in the mains supply, one of these being the constant voltage transformer. The CVT uses circuit resonance to maintain a constant output voltage.
In the short term 20-30mS, the CVT fills in momentary breaks in the mains supply to provide a temporary, uninterruptable power supply.
How does the constant voltage transformer work?
The way the CVT works is simple. The robust design of the double wound transformer combined with ‘galvanic isolation’ ensure there is no direct connection between the mains supply and the load (input/output).
The CVT acts as a barrier to spikes, impulses, harmonics and high-frequency noise. It transforms voltage from one level to another but can also be used in reverse to prevent a ‘noisy load’ polluting the mains.
