Over-current detector
December 2014
Electrical Power & Protection
The IKI-Overhead from Kries is used to detect over-currents, short circuits, earth faults and broken overhead lines in overhead distribution lines. Suitable for use on overhead lines with nominal voltages up to 36 kV, it can be installed and removed directly on the energised line.
In solidly earthed networks and networks with NER/NEC systems, earth faults can be indicated; and with the RTU Ponline-Butler-Overhead, a message to a user’s cellphone can indicate the type of fault and potential location. Two versions are available: the standard model provides local indication of faults by LEDs, while the radio option also provides remote transmission via the Ponline-Butler-Overhead remote terminal unit.
IKI-Overhead with radio option is capable of remotely transmitting a fault message via the Ponline system. The system consists of up to nine IKI-Overhead units and one Ponline-Butler-Overhead within a range of 25 metres. Transmission of fault type messages is sent from the IKI-Overhead to the Ponline-Butler via a short range radio link, while transmission of messages between the Ponline-Butler and the Ponline-Master is done via a GSM-link.
In case of a line break, the IKI-overhead (radio option only) reads a line current below 3 A for at least 10 seconds and the IKI-Overhead sends a message to the Ponline-Butler-Overhead. The Butler collects the messages from all IKI-Overheads within its tuning range and decides whether the condition for asymmetric undercurrent is given (eg, only phase L1 undercurrent, phases L2 and L3 on normal load condition). In case of an asymmetric undercurrent, Ponline-Butler-Overhead will send a fault message to Ponline-Master. In case of symmetric conditions (all phases below 3 A or all phases on load condition) no message will be sent.
Reset of this fault condition is done automatically after re-establishment of at least a 3 A primary current on all phases for at least 10 seconds. Asymmetric undercurrents are only reported by the Ponline message and not optically via LEDs on the IKI-Overhead. If the IKI-Overhead is in normal operation mode, the alarm indication can be tested. The magnet adaptor has to be positioned close to the test/reset mark. Thus the IKI-Overhead is switched into alarm mode and the light begins to flash in a cycle of 0,5 s on – 0,5 s off. For 5 s the IKI-Overhead is in alarm mode and all internal measurement systems are switched off. Additionally the radio-option sends an alive-message to the Butler.
IKI-Overhead meets IP68 requirements and has an ultra-bright alarm indication that is easily visible, even in extreme sunlight. It is also applicable for closed loop networks and networks with secondary feeders, such as wind turbines or generators, when an automatic reclosing function is used at one feeder side.
For more information contact Paul Van As, Surgetek, +27 (0)11 792 1303, [email protected], www.surgetek.co.za
Further reading:
The climate change reality in South Africa: An engineer’s call to action
Electrical Power & Protection
This year’s World Engineering Day on 4 March was a powerful reminder of the critical role engineers play in driving progress toward the sustainable development goals.
Read more...
Empowering Africa’s renewable energy future
Electrical Power & Protection
As a global leader in renewable energy technology, SUNGROW has pioneered sustainable power solutions for over 28 years. At the recent Africa Energy Indaba 2025, SUNGROW showcased its advanced energy solutions designed to meet the diverse needs of the African continent.
Read more...
The role of electromechanical solutions in supporting Africa’s industrial growth
Electrical Power & Protection
Africa’s industries are transforming rapidly. Fuelled by a huge demand for energy connectivity, better infrastructure, increased manufacturing and responsible resource management, electromechanical solutions are key to shaping this growth, allowing industries to scale up their operations efficiently and sustainably.
Read more...
Empowering South Africa’s IPPs for a renewable future
Electrical Power & Protection
Many crucial parts of the economy of the future will be hugely energy intensive, foremost amongst which will be electrified transport and the large data processing required by automation and AI. Successful economies will be those that can ensure businesses and investors have access to a stable supply of low-cost renewable energy. South Africa has the opportunity to become a global leader in this regard.
Read more...
Sustainable mining operations escalate as demand for critical materials to double
Electrical Power & Protection
The mining sector is at the forefront of the energy transition due to its role in extracting essential materials and minerals necessary for green technologies. As demand for renewable energy, electric vehicles and other sustainable technologies increases exponentially, so will the demand for these necessary materials.
Read more...
Monitoring partial discharge on medium voltage switchgear
Schneider Electric South Africa
Electrical Power & Protection
Schneider Electric South Africa has launched its EcoStruxure Service Plan (ESP) in the Anglophone African region for medium voltage (MV) switchgear
Read more...
Raptor switches
Phoenix Contact
Electrical Power & Protection
The Phoenix Contact Raptor switches enable reliable and safe operation in extreme ambient conditions. The managed switch portfolio meets the stringent requirements of IEC 61850-3 and IEEE 1613 standards and is ideal for critical infrastructure and power supply applications.
Read more...
Electrical safety warning indicators
Electrical Power & Protection
Remlive electrical safety warning indicators have been keeping the workplace safe for more than 25 years.
Read more...
Self-contained standalone lightning warning system
Senseca
Electrical Power & Protection
The BTD-200 lightning warning system from Biral (UK) is a complete detection and warning system. Its highly specialised aviation grade lightning detection technology delivers the warning as soon as lightning is detected and before the first strike.
Read more...
Half brick second generation converter
Vepac Electronics
Electrical Power & Protection
The Supreme series half brick second generation converter from Vepac is composed of isolated, board-mountable, fixed switching frequency DC-DC converters that use synchronous rectification to achieve extremely high power conversion efficiency.
Read more...
printer friendly version