Explotación subterránea

Ensuring electrical safety in underground mining

Head Frame and Hoist

Travel Down and Return Safely

The hoist is required to take the equipment an miners up and down the shaft and also to bring ore to the surface for processing. The drive used on the hoist is a large electric motor powered by a frequency converter. To ensure maximum security, the floating or high-resistance grounding system is used as the dominant grounding system. These can be monitored via a Bender ISOMETER®.

 

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Ventilation

A Reliable Supply of Fresh Air

Ventilation of underground mines is crucial for safe operation.. An interruption to the ventilation is potentially life-threatening. It can also create potential for build up of gasses creating a fire hazard and loss of production due to mandatory evacuation. This means continuous ground-fault monitoring using RCMS is vital. Insulation resistance monitoring provides early detection of insulation breakdown and can assist in preventative maintenance planning.

 

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Drainage

Water - a Life-Threatening Risk Underground

Drainage of underground mines is incredibly important. Any interruption to the drainage system increases the risks of shafts filling up with water ruining equipment and people being put in danger. From this perspective, continuous insulation monitoring with ISOMETER®s or RCMS residual current monitoring systems (ground-fault monitors) is essential. Early detection of insulation degradation can help prevent prolonged and unnecessary downtime. Where portable trash pumps or submersible pumps are handled additional safety precautions should be taken by installation of Lifeguard GFCI’s for personnel protection.

 

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Conveyor Belts

Efficient and Safe Material Transport

Electric motors are generally employed for conveyor belts used in mining, which are driven by soft starters or frequency converters. However, these often generate harmonics and DC currents which would normally not be present in an AC system. With regular ground-fault protection or simple insulation monitors (e.g. 3 lamp method or 2 voltmeter process), these circuits cannot be monitored and adequately protected. These specialized applications require more modern monitoring equipment which can recognize and report insulation breakdown and leakage current to ground quickly. Some standards even require a quick shutdown, which can be achieved via ground-fault monitoring devices.

 

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Mobile Equipment and Movable Substations

Safe Mobility Underground

Mining equipment is typically electrically powered. The trailing cables powering these vehicles need monitoring. The monitoring insures proper bonding of the equipment to prevent hazardous shock potential on the frame. . For these applications, Bender offers a range of monitoring options, depending on the requirements for pilot-wire (ground-check) monitoring or ground-fault current protection or ground conductor monitoring.

If the equipment being powered is dc the ISOMETER range of products can be applied.

Substations feeding power to moveable and mobile loads are often required to be resistance grounded. Some standards require continuous monitoring of the neutral grounding resistor. The Bender RC48N and NGRM700 are ideal choices for this protection. Outgoing trailing cables can be monitored with RC48C ground-fault ground-continuity monitor.

 

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Downloads

NameCategorySizeLanguageTimestampD-/B-Number
Product Overview - Residual Current Monitoring Product Overviews 6.2 MB EN2023/11/0909.11.2023
Electrical Safety in Control and Auxiliary Circuits Technical Article 632.6 KB EN2019/05/1313.05.2019

Products

Measuring and monitoring relays

RC48C
RC48C

Trailing cable protection, ground-fault ground-check monitor

Resistance Grounded Systems (HRG/LRG)

LINETRAXX® NGRM700

Monitor for use in high-resistance grounded systems

Ground-Fault Monitoring for Grounded Systems

LINETRAXX® SmartDetect RCMS410

Four-channel DC, AC and pulse current sensitive residual current monitor for earthed AC, AC/DC and DC systems

LINETRAXX® RCMS460-D
LINETRAXX® RCMS460-D Blindspot®

Multi-channel AC/DC ground-fault monitor

LINETRAXX® RCMS460-L
LINETRAXX® RCMS460-L Blindspot®

Multichannel AC, pulsed DC and AC/DC sensitive ground-fault monitor

LINETRAXX® RCMS490-D
LINETRAXX® RCMS490-D Blindspot®

Multi-channel AC/DC ground-fault monitor with individual relay outputs

LINETRAXX® RCMS490-L
LINETRAXX® RCMS490-L Blindspot®

Multichannel AC, pulsed DC and AC/DC sensitive ground-fault monitor with one alarm contact per channel

Current Transformers

LINETRAXX® CTUB100 Series

AC/DC sensitive measuring current transformer (Type B)

Ground-Fault Monitoring, Ungrounded

ISOMETER® iso685…
ISOMETER® iso685 Series

Ground-fault detector for ungrounded AC/DC systems

System Components

AGH150W-4
AGH150

Extension of the nominal voltage range of ISOMETER® iso685… series to AC 0…1150 V, DC 0…1760 V

AGH204S-4
AGH204S-4

Extension of the nominal voltage range of ISOMETER® iso685 series to AC, 3(N)AC 0...1650/0...1300 V

AGH520S
AGH520S

Extension of the nominal voltage range of ISOMETER® to AC 0...7200 V

AGH676S-4
AGH676S-4

Extension of the nominal voltage range of ISOMETER® iso685.../IR420-D64 series to AC 0...12 kV

Measuring and monitoring relays

RC48C
RC48C

Trailing cable protection, ground-fault ground-check monitor

Details

Resistance Grounded Systems (HRG/LRG)

LINETRAXX® NGRM700

Monitor for use in high-resistance grounded systems

Details

Ground-Fault Monitoring for Grounded Systems

LINETRAXX® SmartDetect RCMS410

Four-channel DC, AC and pulse current sensitive residual current monitor for earthed AC, AC/DC and DC systems

Details
LINETRAXX® RCMS460-D
LINETRAXX® RCMS460-D Blindspot®

Multi-channel AC/DC ground-fault monitor

Details
LINETRAXX® RCMS460-L
LINETRAXX® RCMS460-L Blindspot®

Multichannel AC, pulsed DC and AC/DC sensitive ground-fault monitor

Details
LINETRAXX® RCMS490-D
LINETRAXX® RCMS490-D Blindspot®

Multi-channel AC/DC ground-fault monitor with individual relay outputs

Details
LINETRAXX® RCMS490-L
LINETRAXX® RCMS490-L Blindspot®

Multichannel AC, pulsed DC and AC/DC sensitive ground-fault monitor with one alarm contact per channel

Details

Current Transformers

LINETRAXX® CTUB100 Series

AC/DC sensitive measuring current transformer (Type B)

Details

Ground-Fault Monitoring, Ungrounded

ISOMETER® iso685…
ISOMETER® iso685 Series

Ground-fault detector for ungrounded AC/DC systems

Details

System Components

AGH150W-4
AGH150

Extension of the nominal voltage range of ISOMETER® iso685… series to AC 0…1150 V, DC 0…1760 V

Details
AGH204S-4
AGH204S-4

Extension of the nominal voltage range of ISOMETER® iso685 series to AC, 3(N)AC 0...1650/0...1300 V

Details
AGH520S
AGH520S

Extension of the nominal voltage range of ISOMETER® to AC 0...7200 V

Details
AGH676S-4
AGH676S-4

Extension of the nominal voltage range of ISOMETER® iso685.../IR420-D64 series to AC 0...12 kV

Details

Standards

DIN EN 1889-1

Maschinen für den Bergbau unter Tage - Anforderungen an bewegliche Maschinen für die Verwendung unter Tage - Sicherheit - Teil 1: Gummibereifte Gleislosfahrzeuge für den Bergbau unter Tage

DIN EN 50178

Ausrüstung von Starkstromanlagen mit elektronischen Betriebsmitteln

DIN EN ISO 19225

Bergbaumaschinen unter Tage - Mobile Abbaumaschinen im Streb - Sicherheitsanforderungen für Walzenlader und Hobelanlagen 

DIN VDE 0168

Errichten elektrischer Anlagen in Tagebauen, Steinbrüchen und ähnlichen Betrieben

Accionamiento y cintas de transporte

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