Gas discharge tube surge arresters
March 2013
Electrical Power & Protection
DEHN’s DEHNgate is a family of lightning current surge arresters with a cable adaptor design for protecting coaxial systems such as CCTV, mobile radio stations, cell sites and antenna systems. Different mechanical and electrical types are available according to the application. The coaxial DGA arrester family has a range of plugs and arrester technologies allowing for optimised solutions.
The 1/4 wave type DGA L4 surge arresters provide an internal coaxial connection of the inner conductor as a band-pass. Only frequencies within this band are transmitted. For low-frequency impulses such as lightning currents they form a short circuit. This makes them mechanically robust and maintenance-free. Due to their low protection levels and high discharge capacity, they can be used as combined lightning current and surge arresters.
Type DGA FF TV arrestors can be mounted on DIN rails in a space-saving way for protecting satellite systems with several outputs. For single applications such as cable TV, the wall-mounting adaptor can be used. Two F-cable connectors are also included.
If high partial lightning currents can potentially couple into antenna lines or if very high transmission performances are required, 1/4 wave surge arresters provide the best protection. If an additional remote supply is needed for the antenna, a combination of a gas discharge tube and 1/4 wave technology (DGA LG) should be used. The surge arresters are made of top quality material and provide excellent endurance.
Spark-gap based surge arresters have an internal gas-filled surge arrester and can be defined as low pass. This also allows for DC transmission (antenna supply). Peak voltages exceeding the threshold value of the gas discharge tube are discharged.
These surge arresters provide extensive contact surfaces from the inner conductor to the gas discharge tube. This minimises burn-off of material during the discharge and ensures a constant transmission performance.
For more information contact Paul van As, Surgetek, +27 (0)11 792 1303, [email protected], www.surgetek.co.za
Further reading:
Zinc-based batteries power a more sustainable energy future
Electrical Power & Protection
Zinc-based batteries are gaining ground as a safe, recyclable and cost-effective energy storage option, from consumer electronics to grid-scale systems. The International Zinc Association’s Simon Norton explains why zinc is well placed to support the clean energy transition.
Read more...
Energas introduces lower-cost German gas genset for South African market
Electrical Power & Protection
Energas Technologies will supply R Schmitt Enertec’s new Energy Line genset to the South African market, offering German-engineered gas-to-power generation of 400 to 500 kW at a lower entry cost through focused standardisation and a simpler standalone architecture.
Read more...
ACTOM plays key role in large transmission substation project in Swellendam
ACTOM Electrical Machines
Electrical Power & Protection
ACTOM has been appointed to engineer, procure, construct and commission the 1000 MVA main transmission substation for the Overberg Wind Farm in Swellendam, one of the largest substations of its kind in South Africa.
Read more...
Reliable power conversion from high-voltage DC buses
Conical Technologies
Electrical Power & Protection
The MEAN WELL DDRH-240 from Conical Technologies is a high-reliability DIN-rail DC-DC converter with a wide 250 to 1500 V DC input range, deriving stable low-voltage power directly from high-voltage DC buses in renewable energy, storage, charging, railway and industrial installations.
Read more...
AES maintains a strong value and safety stance on boiler retrofits
Electrical Power & Protection
AES Commercial Director Dennis Williams explains when a boiler retrofit makes more sense than replacement, outlines the range of efficiency and emissions upgrades available, and draws the line at safety: a boiler not legally signed off is shut down, no exceptions.
Read more...
The grid needs to become more intelligent
Schneider Electric South Africa
Electrical Power & Protection
South Africa’s power grid is becoming bidirectional and far more dynamic as distributed energy resources proliferate. Schneider Electric’s Nishandra Bajinath explains why digitalisation, DERMS and aggregation are essential to keep this increasingly complex grid stable and efficient.
Read more...
ACTOM’s integrated electrical solutions reduce project risk and accelerate delivery
Electrical Power & Protection
ACTOM has secured multiple orders across four divisions for the Naos-1 hybrid solar and battery project in the Free State, demonstrating its integrated model for supplying the full electrical chain from high-voltage equipment to distribution transformers.
Read more...
Smarter energy management starts with intelligent electrification
ABB South Africa ABB Electrification Products
Electrical Power & Protection
ABB Electrification specialists Adeline Maleka and Nokulunga Dube explain how the convergence of electrification, digitalisation and automation is helping South African industries gain real-time visibility, reduce energy waste and build operational resilience.
Read more...
Electricity security is a strategic imperative for Africa’s growth and industrial future
Electrical Power & Protection
Grid resilience has become as strategic a priority as generation capacity. Africa needs robust transmission and distribution networks, skilled engineers and resilient supply chains to power its energy transition.
Read more...
Mining’s decarbonisation journey starts now
Schneider Electric South Africa
Electrical Power & Protection
Mining companies are embedding decarbonisation into core operational strategies as technology, advisory services and digital platforms help translate ESG commitments into measurable environmental and business outcomes.
Read more...
printer friendly version