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Raycap’s Voltage Limiter (RVL) is designed for overvoltage protection of personnel and equipment in DC rail traction systems.
The voltage limiter is installed between the current return path and structures lying adjacent to the rails (signaling, telecommunication and electrical equipment, catenary poles, etc.)
In case of overvoltage, RVL generates a durable conductive path between the overloaded area and the substation. This increases the current load sensed at the substation, tripping the safety switch and thus protecting personnel and equipment.
Overvoltages generated by lightning, with time duration less than 3ms, are limited effectively by Raycap’s patented surge suppression module (Strikesorb®). Over-voltages with time duration more than 3 ms are limited by a thyristor that has a high-energy handling capability.
All safety requirements imposed by the relevant European standards, mentioned below, are fulfilled by RVL.
EN 50122-1: Railway applications - Fixed installations- Part 1: Protective provisions relating to electrical safety and earthing, and
EN 50123-5: Railway applications - Fixed installations - DC switchgear - Part 5: Surge arresters and low voltage limiters for specific use in DC systems.
Advantages
- Very low let through voltage, less than 850 V.
- Intelligent device triggering with very high precision, less than 0.1 V.
- Temperature independent device triggering voltage, in the range of -40 °C to +85 °C.
- Guaranteed reversibility for 96s and currents up to 1000 A, for protection against the danger of rail potential difference.
- Potential difference is limited to a safe voltage level below 10 V, when the device is in operation.
- Combined protection to personnel and equipment with high-energy absorption capability.
- Capable of withstanding high short-circuit currents
- Five year warranty
Operating conditions:
- Temperature range: -40 °C to
+85 °C
- Weight without accessories: 11 kg
- For indoor and outdoor use (IP 67, UV resistant)
RVL Data Sheet
Acrobat PDF file, 165KB
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