A relay-type voltage stabilizer, also known as an electromechanical voltage stabilizer, is a device designed to regulate and stabilize the voltage levels supplied to electrical equipment. It operates using a combination of electromechanical components, such as relays and transformers. Here is a simplified explanation of its working principle:
Sensing: The voltage stabilizer continuously monitors the input voltage level.
Comparison: It compares the measured input voltage with the desired output voltage level.
Control: If the input voltage deviates from the desired output voltage, the control circuit activates the relays to adjust the output voltage accordingly.
Voltage Regulation: The relays control the flow of current through transformers to step up or step down the voltage, depending on the requirement.
Stabilization: The stabilizer keeps adjusting the output voltage until it reaches the desired level.
Cost-effective: Relay-type stabilizers are generally more affordable compared to other types of voltage stabilizers like servo stabilizers or electronic stabilizers.
Robustness: They are relatively robust and can handle high load capacities. They can handle sudden voltage fluctuations and provide stable output voltage.
Wide voltage range: Relay-type stabilizers can typically handle a wide range of input voltage fluctuations, ensuring stability even when the input voltage varies significantly.
Easy maintenance: These stabilizers are relatively simple in design and have fewer electronic components, making them easier to maintain and repair.
Compatibility: They are compatible with a wide range of electrical and electronic equipment, including household appliances, industrial machinery, and commercial systems.
Fast response time: Relay-type stabilizers can quickly respond to voltage changes and provide immediate correction, minimizing the impact of voltage fluctuations on connected devices.
The disadvantage is that the switching process generates high harmonics, resulting in high output ripple and noise. Relay regulators use an output stage that repeatedly switches between "on" and "off" states to produce an output voltage together with energy storage components (capacitors and inductors). It is adjusted by adjusting the switching timing according to feedback samples of the output voltage.