
The internal high-voltage withdrawable unit PT-12 is designed for 12 kV metal armored mid-frame distribution cabinets (for example, KYN28A-12) as a key metering and protection module. La sua funzione principale è convertire proporzionalmente l'alta tensione del sistema...
The internal high-voltage withdrawable unit PT-12 is designed for 12 kV metal armored mid-frame distribution cabinets (for example, KYN28A-12) as a key metering and protection module. Its main function is to proportionally convert high system voltage into a standard low voltage of 100V, providing accurate voltage signals for metering, monitoring and protection devices.
Questa apparecchiatura integra tutti i componenti nel telaio del cassetto: fusibili ad alta tensione, trasformatore di tensione (PT) e terminali primari. Questo design garantisce un abbinamento ideale con il quadro elettrico a telaio centrale. L'unità mobile ha due posizioni standard: lavoro e prova, che consentono una messa in servizio o una rimozione sicura per la manutenzione. When the unit is in the test position, the primary circuit is interrupted, but the secondary control circuit remains connected, allowing normal adjustment of the protection and measurement functions.
The PT-12, acting as a “voltage sensor” in the system, provides a reliable basis for energy metering, voltage indication, power calculations and relay protection (for example, undervoltage and overvoltage protection). Its compact design, convenient maintenance and reliable insulation make it a key auxiliary device to ensure safe, stable and efficient operation of the medium voltage system.