3EQ1
HV Surge Arrester 3EQ1, Polymer hollow core, 10 kA, ≤252 kV
3EQ1
- Metal-oxide surge arrester in silicone rubber-housed composite hollow-core design for high-voltage stations
- Protects circuit breakers, transformers, generators, motors, capacitors, bushings and switchgear
- Line discharge class 2/3 — energy absorption 5.0/8.0 kJ/kVr, long-duration current impulse 750/1100 A, high current impulse 100 kA
- Rated short-circuit current 40 kA, dynamic bending moment 6.0 kNm
- Tested to IEC 60099-4; silicone rubber housing, hydrophobic and flame-retardant (IEC 60707, UL94 V-0)
Transformer protectionCircuit breaker protectionGenerator and motor protectionCapacitor bank protectionHV switchgear and bushing protection
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3EQ1 covers up to 252 kV of the hv station arresters range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Product family | 3EQ1 |
| Product type | Metal-oxide surge arrester |
| Application | High-voltage systems |
| Protection of | Circuit breakers, transformers, generators, motors, capacitors, bushings, switchgear |
| Variants | Phase arrester (…P…) and neutral-point arrester (…S…) |
Electrical
| Max. system voltage Us | 252 kV |
| Max. rated voltage Ur | 210 kV |
| Min. system voltage | 72.5 kV |
| Nominal discharge current In | 10 kA |
| Short-circuit rating Isc | 40 kA |
| Line discharge class | 2/3 |
| Energy absorption capability | 5.0 kJ/kVr (LD class 2) / 8.0 kJ/kVr (LD class 3) |
| Long-duration current impulse (2 ms) | 750 A / 1,100 A |
| High current impulse | 100 kA |
| Residual voltage example (Ur 192 kV, 10 kA 8/20 µs) | 461 kV |
| Residual voltage example (Ur 120 kV, LD class 3, 10 kA 8/20 µs) | 288 kV |
Mechanical / environment
| Housing material | polymer |
| Design | Polymer hollow-core housing |
| Housing construction | Silicone rubber, alternating sheds, gray, on composite hollow-core (FRP) tube; upright or suspended mounting |
| Housing sizes | B, E, J, P, S (1 unit); 2xJ, 2xP (2 units) |
| Height | 885 mm (housing B) … 2,970 mm (housing 2xP) |
| Creepage distance | 2,075 mm (B) … 8,660 mm (2xP) |
| Specified short-term load SSL | 6,780 N (B) … 2,020 N (2xP) |
| Specified long-term load SLL | 4,750 N (B) … 1,410 N (2xP) |
| Bending moment, dynamic | 6.0 kNm |
| Arrester weight | approx. 29.5 – 77.3 kg (varies with rated voltage and LD class) |
| Housing lightning impulse withstand (1.2/50 µs) | 348 kV (B) … 1,392 kV (2xP) |
| Housing switching impulse withstand (250/2500 µs, wet) | 252 kV (B) … 1,008 kV (2xP) |
| Power-frequency withstand (1 min, wet) | 162 kV (B) … 648 kV (2xP) |
| Housing material temperature capability | –60 °C to +200 °C (silicone rubber) |
| Base mounting options | 200×200 mm base (grounded or insulated), 310×310 mm base (insulated), or D = 10″ (grounded or insulated) |
Standards & certifications
| Standards | IEC 60099-4 |
| Energy classification | Line discharge class 2 / 3 per IEC 60099-4 (Ed. 3.0 replaces LD classes with charge classification; catalog data given as LD class + kJ/kVr) |
| Housing flammability | Flame-retardant, self-extinguishing per IEC 60707 / UL94 V-0 |
Options & variants
Representative phase-arrester ratings from the HV surge arrester catalog (pp. 88–89); minimum housing size shown, larger housings selectable for creepage. Full catalog family reaches Us 362 kV / Ur 288 kV; the shop configurator scope covers Us ≤ 252 kV / Ur ≤ 210 kV. Top-ordered SAP material 3EQ11922PJ324NH5 (= 3EQ1 192-2PJ32-4NH5: Ur 192 kV, LD class 3, phase, 2×J housing) matches the Us 245 kV row (catalog Uc 154 kV vs. '192/152 kV' SAP text = MCOV); 3EQ11802PJ324NH5 (Ur 180 kV) matches the typical Ur for Us 245 kV solidly earthed systems (catalog p. 27).
| Us (kV) | Ur (kV) | Uc (kV) | LD class | I2ms (A) | Min. housing (units) |
|---|---|---|---|---|---|
| 72.5 | 72 | 58 | 2 | 750 | B (1) |
| 123 | 96 | 77 | 2 | 750 | B (1) |
| 145 | 120 | 96 | 3 | 1100 | J (1) |
| 170 | 150 | 120 | 3 | 1100 | J (1) |
| 245 | 192 | 154 | 3 | 1100 | P (1) |
| 245 | 198 | 158 | 3 | 1100 | S (1) |
| 300 | 240 | 192 | 3 | 1100 | 2xJ (2) |
| 362 | 288 | 230 | 3 | 1100 | 2xP (2) |
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
Terminal adapters
DIN/NEMA adapter terminal
Terminal adapters
Adapter DIN/NEMA to double NEMA
Line connection
Line clamp
Documents & downloads
Catalog High-voltage surge arresters — product catalog
Datasheet 3EQ1 technical datasheet (HV catalog pp. 85–91)
Guide 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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