1040 results:

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Variable-speed drives and pulsing ground-fault location

 
The effect of harmonics from VFD’s on ground-fault protection Variable-speed drives use semiconductor components to rectify and invert voltage and current. To create an AC output, the internal DC…  

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Conversion of a solidly grounded system into an HRG system

 
Why NGR’s require continuous monitoring The neutral-grounding resistor (NGR) is a critical element of a high-resistance-grounded (HRG) electrical power system. HRG systems always include…  

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TN-S-/TT system

 
By the use of residual current monitoring systems, a message is given to the user before the shutdown threshold of an RCD is reached. RCMs (Residual Current Monitors) monitor residual currents in…  

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Continuous availability, operational reliability and cost efficiency through permanent residual current monitoring

 
Comparison of the necessary insulation resistance measurements with an RCM-monitored electrical system The following section compares conventional DC insulation resistance measurement with the…  

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How does residual current monitoring work?

 
All conductors of the outgoing circuit to be monitored (except the PE conductor) are routed through a measuring current transformer. In a fault-free system, the sum of all currents is equal to zero…  

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Why residual current monitoring?

 
Comprehensive information Clear information centrally indicated on an LC display Transparency of all safety-related information through data transfer via bus systems and integration into…  

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Signalling instead of switching – Residual current monitoring in earthed systems

 
In TN systems, the star point of the feeding transformers is connected to earth through a low impedance and the exposed conductive parts of the electrical installation are connected to the…  

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IT system: Unearthed systems for maximum availability

 
As input to unearthed IT systems, either a transformer or an independent power source, such as a battery or a generator are used. Since no active conductor is connected to earth with a low…  

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IT systems as reflected in the standards

 
Figure 13: The second fault in the IT system In accordance with IEC 60364-4-41:2017-03, subclause 411.6.4, after an initial fault occurs, the conditions for an automatic disconnection following a…  

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Insulation resistance - testing, measuring, monitoring

 
During periodic tests the measurement of the insulation resistance is part of the measurements to be undertaken in accordance with DIN VDE 0105-100 (VDE 0105-100):2009-10. The insulation…  
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