Control relays designed for cable theft detection

From Becker Mining South Africa.

Becker Mining South Africa's Proloc and ProBeck low voltage electronic protection and control relays have been designed for motor protection for pumps and fans, as well as highly effective cable theft detectionBecker Mining South Africa's Proloc and ProBeck electronic protection and control relays have been designed for motor protection, as well as cable theft detection, in diverse industries, including mining and quarrying, electrification, municipalities, water and wastewater, chemical, petrochemical and general engineering.

'Becker's low voltage relays, with advanced technologies for dependable protection of electric motors used on pumps, fans, conveyors and compressors, can also be used as highly effective stand-alone cable protection systems, to guard against cable theft,' says Frikkie Quirk, senior general manager of electrical at Becker Mining South Africa. 'Becker relays are programmed to detect cable theft by identifying a change in impedance of cable up to 1 100 V connected to a motor or pump.

'In the event of cable tampering, the unit sends an SMS, or activates an emergency alarm or siren. This system is capable of SCADA visualisation and is able to communicate relevant information to a control room via an existing PLC.

'The Becker cable theft detection system, with real time and date, is able to log up to 1 400 events, providing critical information, including when the alarm was activated and how long it took for someone to respond. The system needs to be re-set at the location of the alarm in order to confirm response by security. When the re-set facility is activated, the unit logs the date and time of the response.'

This protection system, which requires only 220 V or 110 V to power the unit, can also be used as stand-alone units to monitor cable without power. A battery back up facility for SMS communication provides power back-up for up to eight hours.

Proloc and ProBeck electronic relays for motors (380 V, 400 V, 525 V, 950 V and 1100V – 3,3 kV and 6,6 kV) have features for thermal overload protection, earth insulation lockout, frozen or vacuum contact failure and earth leakage protection. Other use-selectable features include short circuit, frequency and power factor measurement, as well as minimum load, over voltage and under voltage protection.

Becker protection relays are also used to control pumps and motors based on water levels, valve position, temperature sensors, time of day and moisture content of the soil.

These devices, which are able to detect dry run in boreholes, tanks and dams, can be programmed to automatically re-start pumps after a specified time or set level.

An important advantage of this system is a door mounted infra-red link that enables a laptop, with Proloc software, to manage all settings and downloads, without having to open the panel door and expose personnel to dangerous live equipment. This safety feature is a critical requirement in the OHSA Act. (No special licenses are necessary for the software.)

Becker Mining South Africa offers a technical advisory and support service throughout the country to ensure total reliability of equipment.

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