Mittausjännitemuuntajat

Mittausjännitemuuntajat, often referred to as voltage transformers (VTs) or potential transformers (PTs), are essential components in electrical power systems. Their primary function is to step down high system voltages to a safe and measurable level for electrical instruments and protective relays. This allows for accurate monitoring of the power system's voltage and provides the necessary signals for devices that ensure the system's stability and safety.

These transformers are designed for metering and protection purposes, meaning they provide voltage information to devices that measure energy consumption and devices that detect faults and initiate protective actions. The secondary winding of a mittausjännitemuuntaja is typically designed to have a low impedance and is connected to these instruments. Accurate voltage transformation is crucial for proper operation of these connected devices.

Mittausjännitemuuntajat are constructed with a primary winding connected directly across the high-voltage line and a secondary winding providing the reduced voltage output. They are designed to have a low burden, meaning they can supply power to connected instruments without significantly affecting the voltage they are measuring. Different types of mittausjännitemuuntajat exist, including electromagnetic and capacitive voltage transformers, each suited for different applications and voltage levels. Their reliable operation is vital for the efficient and safe functioning of modern electrical grids.