Two-pole phase comparators
April 2012
Electrical Power & Protection
Dehn’s PHV phase comparators are two-pole devices that offer safe and reliable operation while testing for in-phase conditions in three-phase electrical systems. They are suitable for rated voltages up to 36 kV/ 50 Hz, have SABS approval and meet the requirements of IEC 6148 standards. The equipment has distinctive red rings on both test prods that mark the end of the insulating sections in the direction of the operating head/indicator. It represents a visible limit of contact with live and earthed system parts, as well as the depth of penetration allowed into electrical systems. Types PHV are suitable for use in indoor and outdoor systems, but not in wet conditions.
The eccentric mounting of the indication ensures good visibility from various angles and provides for an out-of-phase condition when the phase angle between the two parts of the system to be tested is between 60° and 300°. A clear and sharp threshold is provided and the indication remains at a constant frequency over the testing range.
Various colour coded test prods are available and are selected for the desired voltage, and their simple bayonet connection ensures easy coupling to the basic test unit. The compact range is ideal for use in areas where space is limited, while standard test prods are suited for areas where larger span and separation is required. Test prods with a 90° degree angle are available for testing in switchgear where the axis of the bushing is mounted in a vertical plane.
Used in contact with the parts to be tested, the PHV phase comparator is insensitive to magnetic and electrical interference with false indications completely eliminated.
For more information contact Johan van Staden, 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