UNE EN 61643-351:2017
Components for low-voltage surge protective devices - Part 351: Performance requirements and test methods for telecommunications and signalling network surge isolation transformers (SIT) (Endorsed by Asociación Española de Normalización in March of 2017.)
Componentes para protección contra sobretensiones transitorias de baja tensión. Parte 351: Requisitos de funcionamiento y métodos de ensayo para transformadores de aislamiento contra rayos de las redes de telecomunicaciones y de transmisión de señales (Ratificada por la Asociación Española de Normalización en marzo de 2017.)
| Standard number: | UNE EN 61643-351:2017 |
| Pages: | 34 |
| Released: | 2017-03-01 |
| Status: | Standard |
UNE EN 61643-351:2017
LIGHTNING ISOLATION TRANSFORMERS (LITs) are used for signal transformer applications with signal levels up to 400 V peak to peak. LITs are transformers, with or without an internal-winding screen, with a rated impulse withstand voltage greater than the peak voltage of the expected common-mode surge environment. LITs are applicable to component for surge protection against indirect and direct effect of lightning or other transient overvoltage. LITs are used to mitigate the onward propagation of common mode voltage surges. This standard defines test circuits and test methods for determining and verifying the LIT surge parameters. Preferred performance values for key parameters are given. This standard doesn t cover LIT operation under differential mode lightning surge conditions.