This document describes Siemens' 3ES series surge arresters, which are suitable for high voltage systems up to 800 kV. These arresters are metal-enclosed and SF6-insulated, providing long service life and high reliability. They are particularly suitable for protecting gas-insulated switchgear and transformers.
The 3ES series surge arresters are metal‑enclosed, SF6‑insulated devices designed for high‑voltage systems up to 800 kV. They are suitable for gas‑insulated switchgear (GIS), transformers and other critical equipment, offering low self‑inductance and close‑mounting capability to minimise travelling‑wave over‑voltages. Key features include pressure‑relief safety diaphragms, optional gas‑monitoring connections, versatile bushing options, and a design that eliminates the need for transport retainers during start‑up. The arresters are virtually maintenance‑free, requiring only periodic gas humidity checks and filter replacement after extended service periods.
| Maximum nominal discharge current | 20 kA |
|---|---|
| Maximum height (3ES2‑C/D) | 1505 mm |
| Maximum weight (3ES2‑C/D) | 250 kg |
Each GIS surge arrester provides a gas connection that can be integrated into an existing gas monitoring system.