Power Systems Technical Articles

Our experts continuously work on power systems problems, and we share solutions with Practical Reference Articles.

The main topics are earthing system modeling, power cable ratings, HV/LV electrical design, protective device coordination, and arc flash studies. We cover IEC and IEEE standards.

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12 mins read
Size active, neutral, and earth cables using AS/NZS 3008. The guide covers current capacity, voltage drop, and short-circuit calculations with examples.
Low voltage earthing systems include TN-S, TN-C-S, TT, IT and DC. High voltage earthing includes solid, ungrounded, resistance, reactance and resonant.
7 mins read
Equations for calculating conduit sizes and space factors in accordance with standards are provided. Worked examples of conduit sizing calculations are provided.
4 mins read
Equations and method with all steps for accurate voltage drop calculations including power factor, cable operating temperature, resistance, reactance, DC, 1-phase or 3-phase, balanced/unbalanced with calculation examples provided.
5 mins read
The purpose of this document is to provide a better understanding of Fault Loop Impedance, also referred to as Earth Fault Loop Impedance so that the requirements of AS/NZS 3000 Wiring Rules for safety, design, installation and testing of electrical installation may be met.
Derating factors are applied to the cable current rating ensuring that cable operating temperature limits are not exceeded. Derating factors are derived to match the specific cable installation conditions.
1 min read
Reference tables for diversity factors and energy demand from Wiring Rules AS/NZ 3000 for domestic and non-domestic installations.
11 mins read
Sheath bonding is one of the most important design aspects for high-voltage cable power transmission. Solidly, single-point, and cross-bonded systems are explained.
2 mins read
Voltage Drop Limits per the Wiring Rules AS/NZS 3000 as well as rules of thumb to assist with electrical design. Includes AC and DC voltage drop or rise limits.
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