mittausjännitemuuntaja

A mittausjännitemuuntaja, or measuring voltage transformer, is a type of instrument transformer used in electrical power systems. Its primary function is to reduce a high voltage to a lower, standardized level that can be safely measured by standard voltage measuring instruments, such as voltmeters and relays. It also provides electrical isolation between the high-voltage primary circuit and the low-voltage secondary circuit.

These transformers are crucial for protecting both personnel and equipment from dangerous high voltages. By stepping down the voltage, they allow for the use of less robust and more cost-effective measuring devices. The secondary voltage is typically standardized at a value like 100V or 110V, regardless of the primary voltage.

Mittausjännitemuuntajat are designed with high accuracy in mind, as the measurements they facilitate are often used for billing, system monitoring, and protection relaying. They are constructed to withstand the electrical and thermal stresses present in power systems. The design involves a primary winding connected in parallel with the line being monitored and a secondary winding where the reduced voltage is available.

Common applications include their use in substations, power plants, and industrial facilities where high voltages are present. They are essential components in the overall infrastructure for managing and controlling electrical power grids.