Seguridad eléctrica en la minería a cielo abierto

Electrical Safety in Surface Mining

Excavators and Drills

High performance with stable and reliable monitoring

The large excavators used for open-pit mining use many different drives. They use both medium voltage and low voltage drives. While portable loads are most often supplied power from resistance grounded sources they are also allowed to use ungrounded power for special drive circuits. The large drives are often ungrounded on the load side of the drive. The secondaries insulation can be monitored by an ISOMETER® with a coupling device where required. For low voltage drives that are not transformer isolated a residual current monitoring system (RCMS) can be used. If the low voltage drive is on an ungrounded supply the ISOMETER® insulation monitoring with EDS, as in both cases the faults occurring are immediately detected and reported to significantly improve availability.

 

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Overland Conveyors and Stacker/Reclaimers

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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Heavy Trucks and Shops

Material Moving and Maintenance

Heavy haul trucks are increasingly being powered by electric drives or wheel motors. Bender ground-fault monitoring devices monitor the complete electrical drive system for utility vehicles including all electric or hybrid drives (often single-wheel drive). This means they provide effective protection against electric shocks and minimize the fire risk. In addition to onboard electrical protection Bender relays are also installed to protect equipment used to work on these trucks. The Lifeguard can be used on loads fed from welding receptacles in shops and wash bays.

 

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Crushers and vibrating screens

Material Downsizing

Crushers are needed in mining to break down the ore extracted from the ground. These use very large, powerful motors which are powered by soft starters or frequency converters due to their size. The resulting harmonics and DC currents are not recognized by GFCIs. The use of a adjustable RCMA residual current monitoring system (ground-fault monitor) is therefore advisable to improve fault detection.

 

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Fixed and Portable Substations

Provide Safe and Reliable Power

Mines require power for extraction and processing. This power can be supplied by generators or local utilities depending on where the mine site is located. Larger mines may have utility power crews that work on high voltage but most often mines deal with medium voltage power. The medium voltage is either used directly by large machines or it is transformed to lower voltage for smaller equipment and loads. All three common methods of system grounding (solidly, resistance and ungrounded) may be used on a mine site. For grounded systems the Bender residual current monitors (RCM), Neutral grounding resistor monitors (NGRM’s) and ground-check relays offer sensitive and cost effective protection. For ungrounded systems including the secondaries of large drives, Bender ISOMETER®s are an ideal choice for insulation monitoring and trending.

Complete neutral grounding resistor packages can be supplied by Bender complete with components required for continuous monitoring. Typically the NGR’s are mounted outdoors near the power transformer.

 

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Downloads

NameCategorySizeLanguageTimestampD-/B-Number
Product Overview ISOMETER®/ISOSCAN® Product Overviews 5.3 MB EN2024/02/1616.02.2024
Product Overview - Residual Current Monitoring Product Overviews 6.2 MB EN2023/11/0909.11.2023
Mining Market Segment Brochures 2.6 MB EN2021/08/2626.08.2021
EDS309x Application Notes 1.4 MB EN2019/05/1313.05.2019D00012
Insulation Fault Location - Planning and Setup Technical Article 112.4 KB EN2019/05/1313.05.2019
Why the IT System is Often the Best Choice for Power Supply Systems of All Types Technical Article 3.0 MB EN2019/07/1111.07.2019
A Giant on its Way Towards the Future Technical Article 111.8 KB EN2019/05/1313.05.2019
Electrical Safety in a Modern Nickel Smelting Plant Technical Article 358.8 KB EN2019/05/1313.05.2019
Innovative Shearer Loader for Safe and Highly Efficient Coal Mining Operations Technical Article 222.7 KB EN2019/05/1313.05.2019
Electrical Safety in Control and Auxiliary Circuits Technical Article 632.6 KB EN2023/04/2121.04.2023

Products

Ground-Fault Monitoring, Ungrounded

ISOMETER® iso685…
ISOMETER® iso685 Series

Ground-fault detector for ungrounded AC/DC systems

Ground-Fault Location, Ungrounded

ISOSCAN® EDS460-D
ISOSCAN® EDS460-D

- This device series is in the discontinuation phase. -
Deliverable according to availability until 01.01.2025.

ISOSCAN® EDS30…
ISOSCAN® EDS3090 Series

Portable ground-fault location systems for ungrounded and 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® RCMS490-D
LINETRAXX® RCMS490-D Blindspot®

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

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

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

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)

Resistance Grounded Systems (HRG/LRG)

LINETRAXX® NGRM700

Monitor for use in high-resistance grounded systems

Power Quality

LINETRAXX® PEM353

Universal measuring device with numerous measured quantities, energy and power measurement with storage, Power Quality Monitoring, limit value monitoring with alarm forwarding

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

AGH675S-7/AGH675S-7MV15
AGH675S-7

The coupling device AGH675S-7/AGH675S-7MV15 is designed to extend the nominal voltage range of the ISOMETER® IRDH275BM-7 to AC/DC 0…15.5 kV

AGH676S-4
AGH676S-4

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

Ground-Fault Monitoring, Ungrounded

ISOMETER® iso685…
ISOMETER® iso685 Series

Ground-fault detector for ungrounded AC/DC systems

Details

Ground-Fault Location, Ungrounded

ISOSCAN® EDS460-D
ISOSCAN® EDS460-D

- This device series is in the discontinuation phase. -
Deliverable according to availability until 01.01.2025.

Details
ISOSCAN® EDS30…
ISOSCAN® EDS3090 Series

Portable ground-fault location systems for ungrounded and 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® RCMS490-D
LINETRAXX® RCMS490-D Blindspot®

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

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

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

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

Resistance Grounded Systems (HRG/LRG)

LINETRAXX® NGRM700

Monitor for use in high-resistance grounded systems

Details

Power Quality

LINETRAXX® PEM353

Universal measuring device with numerous measured quantities, energy and power measurement with storage, Power Quality Monitoring, limit value monitoring with alarm forwarding

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
AGH675S-7/AGH675S-7MV15
AGH675S-7

The coupling device AGH675S-7/AGH675S-7MV15 is designed to extend the nominal voltage range of the ISOMETER® IRDH275BM-7 to AC/DC 0…15.5 kV

Details
AGH676S-4
AGH676S-4

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

Details

Standards

EN 61557-8

Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V – Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 8: Isolationsüberwachungsgeräte für IT-Systeme

EN 61557-9

Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V – Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 9: Einrichtungen zur Isolationsfehlersuche in IT-Systemen

EN 61557-15

Elektrische Sicherheit in Niederspannungsnetzen bis 1000 V AC und 1500 V DC - Geräte zum Prüfen, Messen oder Steuern von Schutzsystemen - Teil 15: Anforderungen an die funktionale Sicherheit von Isolationssteuergeräten in IT-Systemen und Geräten zur Erkennung von Isolationsfehlern in IT-Systemen

DIN EN 50178

Ausrüstung von Starkstromanlagen mit elektronischen Betriebsmitteln

DIN EN 61851-1 (VDE 0122-1):2012-01

Elektrische Ausrüstung von Elektrofahrzeugen Konduktive Ladesysteme für Elektrofahrzeuge – Teil 1: Allgemeine Anforderungen

DIN EN 61851-21

Elektrische Ausrüstung von Elektro-Straßenfahrzeugen - Konduktive Ladesysteme für Elektrofahrzeuge - Anforderung eines Elektrofahrzeuges für konduktive Verbindung an AC/DC-Versorgung

DIN VDE 0168

Errichten elektrischer Anlagen in Tagebauen, Steinbrüchen und ähnlichen Betrieben

Accionamiento y cintas de transporte

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