INZP and SL surge arresters, distribution 3–48 kV and station class
Metal-oxide surge arresters without spark gaps in a polymer silicone housing. Distribution INZP of heavy duty class have a nominal discharge current of 10 kA and Ur 3–48 kV, station and line SL have ZnO varistors. Used to protect transformers, switchgear and cable terminations in 6–35 kV networks.
- Type
- metal-oxide without spark gaps, polymer (HTV silicone) housing
- INZP
- 10 kA, heavy duty class, Ur 3–48 kV, Uc 2.55–39 kV; INZP…/IS for cable poles (riser pole)
- Tests
- 2×100 kA 4/10; 18 impulses 250 A 2000 µs; duty cycle 20×10 kA + 2×100 kA
- Energy capability
- 3.36 kJ/kV
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Metal-oxide surge arresters for distribution networks and substations are produced by a company in Spain which, by its own assessment, is one of the few national manufacturers in the country that meet the strictest quality standards. INZP are distribution arresters of heavy duty class with a nominal discharge current of 10 kA: without spark gaps, based on highly nonlinear metal-oxide varistors, in a polymer housing.
Tests were carried out to ANSI/IEEE C62.11 and IEC 60099-4. They are two high current impulses of 100 kA (4/10), 18 impulses of 250 A lasting 2000 µs and an operating duty cycle of 20 discharges of 10 kA 8/20 µs followed by two impulses of 100 kA. After each test the device is thermally stable, and the rise in residual voltage does not exceed 5 %. The specific energy capability is 3.36 kJ/kV, the maximum ambient temperature 60 °C (average up to 40 °C).
The range of rated voltages Ur covers 3, 6, 9, 10, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45 and 48 kV with a continuous operating voltage Uc from 2.55 to 39 kV, and residual voltages at currents of different amplitudes are given for each rating. The INZP…/IS version (riser pole) with reduced residual voltages is intended for cable poles. The selection tables cover 4.2–47 kV networks with earthed and isolated (compensated) neutral, taking the temporary overvoltage (TOV) characteristic into account.
The HTV silicone rubber housing is hydrophobic, water collects into droplets and rolls off, cleaning the surface, so the arresters work in polluted areas without cleaning or greasing. The arresters withstood 5000-hour accelerated polymer ageing under Annex C of IEC 61109. The polymer housing rules out chips and cracks of porcelain during transport and reduces weight. Accessories are NEMA type B fittings and insulating caps; supply without accessories is also possible.
SL are polymer station arresters and arresters for power transmission lines. The manufacturer develops and makes the ZnO varistor blocks itself, which makes it possible to adapt the parameters to a specific application. Applications cover protection of transformers, switchgear and cable terminations in 6–35 kV networks, substations and overhead lines.
Technical specifications
| Type | metal-oxide without spark gaps, polymer (HTV silicone) housing |
|---|---|
| INZP | 10 kA, heavy duty class, Ur 3–48 kV, Uc 2.55–39 kV; INZP…/IS for cable poles (riser pole) |
| Tests | 2×100 kA 4/10; 18 impulses 250 A 2000 µs; duty cycle 20×10 kA + 2×100 kA |
| Energy capability | 3.36 kJ/kV |
| Ageing | 5000 h to IEC 61109 (Annex C) |
| SL | station and line polymer arresters (SL class), in-house ZnO varistors |
| Standards | IEC 60099-4, ANSI/IEEE C62.11 |
Request a price and lead time
INZP and SL surge arresters, distribution 3–48 kV and station class. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What discharge current and voltage range do INZP arresters have?
Nominal discharge current 10 kA, heavy duty class, Ur from 3 to 48 kV at a continuous operating voltage Uc from 2.55 to 39 kV.
What standards were the arresters tested to?
IEC 60099-4 and ANSI/IEEE C62.11. They withstand two 100 kA impulses, 18 impulses of 250 A lasting 2000 µs and 5000 hours of accelerated ageing under Annex C of IEC 61109.
What housing do the arresters have and for which networks are they intended?
A polymer HTV silicone rubber housing, hydrophobic. The selection tables cover 4.2–47 kV networks with earthed and isolated neutral, for use in 6–35 kV networks.
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