3EP6
HV Surge Arrester 3EP6, Porcelain housing, 10/20 kA, ≤800 kV
3EP6
- Station-class metal-oxide surge arrester for systems up to 800 kV — protects transformers, circuit breakers, generators, motors, capacitors, bushings and switchgear
- Porcelain housing with directional pressure relief device; MO blocks held in a rigid FRP-rod cage, sulfur-cemented aluminum flanges
- Line discharge class 3/4/5 — energy absorption 8/10/14 kJ/kVr, long-duration current impulse 1100/1600/2000 A (2 ms)
- 65 kA short-circuit rating, 100 kA high-current impulse, dynamic bending moment 18/30 kNm, seismic qualification 0.5 g up to 800 kV
- Tested to IEC 60099-4
Transformer protectionCircuit breaker and switchgear protectionGenerator and motor protectionCapacitor bank protectionBushing protection
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3EP6 covers up to 800 kV of the hv station arresters range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Product family | 3EP6 |
| Product type | Metal-oxide surge arrester |
| Application | High-voltage systems |
| Arrester class | Station class, phase (P) and neutral-point (S) versions |
| Protection of | Transformers, circuit breakers, generators, motors, capacitors, bushings, switchgear |
Electrical
| Max. system voltage Us | 800 kV |
| Max. rated voltage Ur | 684 kV |
| Min. system voltage | 123 kV |
| Nominal discharge current In | 20 kA |
| Short-circuit rating Isc | 65 kA |
| Line discharge class | 3/4/5 |
| Energy absorption capability | 8.0 / 10.0 / 14.0 kJ/kVr (LD class 3 / 4 / 5) |
| Long-duration current impulse (2 ms) | 1100 / 1600 / 2000 A (LD class 3 / 4 / 5) |
| High current impulse | 100 kA |
| Residual voltage example (Ur 96 kV, class 3) | 230 kV at 10 kA, 8/20 µs |
| Residual voltage example (Ur 420 kV, class 4) | 966 kV at 10 kA, 8/20 µs |
| Residual voltage example (Ur 588 kV, class 5) | 1323 kV at 10 kA, 8/20 µs |
Mechanical / environment
| Housing material | porcelain |
| Design | Porcelain hollow-core housing |
| Sheds / color | Alternating sheds; brown or gray porcelain |
| Housing sizes | C to 3xJ (1–3 units), height 1,299–6,573 mm |
| Creepage distance | 3,941–23,004 mm (housing C to 3xJ) |
| Housing lightning impulse withstand (1.2/50 µs) | 600–3,348 kV (housing C to 3xJ) |
| Housing switching impulse withstand (250/2500 µs, wet) | 392–2,190 kV (housing C to 3xJ) |
| Specified short-term load SSL | up to 13,850 N (housing C); increased-SSL variants available |
| Specified long-term load SLL | up to 5,540 N (housing C) |
| Dynamic bending moment | 18/30 kNm |
| Seismic qualification | 0.5 g, guaranteed up to 800 kV |
| Internal design | MO blocks in rigid FRP-rod cage; directional pressure relief device at both ends |
| Flanges | Aluminum, bonded with non-porous sulfur cement (corrosion-free vs. Portland cement) |
| Mounting | Upright or suspended; grounded or insulated base (240×240 mm, 310×310 mm, D=10", D=16.5") |
| Weight | 137–802 kg depending on housing |
| Grading ring | 800–2,100 mm diameter on larger housings (J-g and above) |
Standards & certifications
| Standards | IEC 60099-4 |
Options & variants
Representative phase-arrester ratings from the HV surge arrester catalog (pp. 72–73). Trailing order-number digits encode terminal, nameplate, sheds/color and mounting options. Neutral-point (S) versions available for Us 245/420 kV.
| Type (order no.) | Us (kV) | Ur (kV) | Uc (kV) | LD class | In (kA) | Min. housing |
|---|---|---|---|---|---|---|
| 3EP6 096-2P.3 | 123 | 96 | 77 | 3 | 10 | C |
| 3EP6 144-3P.4 | 145 | 144 | 115 | 4 | 20 | C |
| 3EP6 198-3P.4 | 245 | 198 | 158 | 4 | 20 | F |
| 3EP6 288-4P.5 | 362 | 288 | 230 | 5 | 20 | 2xD |
| 3EP6 360-4P.5 | 420 | 360 | 288 | 5 | 20 | 2xG |
| 3EP6 420-3P.4 | 550 | 420 | 336 | 4 | 20 | 2xJ |
| 3EP6 588-4P.5 | 800 | 588 | 470 | 5 | 20 | 3xJ |
Compatible accessories
Earth terminals
Earth terminal, copper tin-plated
Earth terminals
Eyebolt earth terminal
Earth terminals
NEMA earth, stainless steel
Earth terminals
NEMA earth, copper
Earth terminals
Palm earth, aluminum
Terminal adapters
DIN/NEMA adapter terminal
Terminal adapters
Adapter DIN/NEMA to double NEMA
Line connection
Line clamp
Special options
N₂ filling (inert gas)
Documents & downloads
Catalog High-voltage surge arresters catalog (3EP6 section pp. 69–76)
Handbook Metal-oxide Surge Arresters in High-voltage Power Systems (application handbook, 4th ed.)
Also covered in the technical library
Catalog High-voltage surge arresters — Product guide
Catalog High-voltage surge arresters — Siemens Energy product guide (online edition)
Brochure Our portfolio of surge arresters & composite insulators — Siemens Energy
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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