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Power Systems
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Explore distribution substations, instrument transformers, power factor and power quality. Connect the system layout with the measurements needed for selection and fault diagnosis.Substation basics ยท Voltage disturbance diagnosis
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Selecting a UPS System for Critical Power Applications
An uninterruptible power system is selected by the function that must remain available, not by a single kilovolt-ampere target. The protected equipment, duration of a process, allowable transfer…
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Voltage Unbalance: Measurement Basis, Motor Effect and Corrective Action
Voltage unbalance is a property of the three-phase voltage set, not a label for one low phase or one voltage fluctuation. To measure it defensibly, first decide whether…
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VFD Harmonic Mitigation: Select by Spectrum, Point of Common Coupling and Load
Harmonic mitigation cannot be selected from a product category alone. Define the point of common coupling (PCC) and governing limit, obtain a representative spectrum, model impedance and resonance,…
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Inside a Capacitor Bank Panel: Power Paths, Sensing and Step Control
An automatic capacitor-bank panel has two different paths to understand: the power path that connects capacitor steps to the bus, and the sensing/control path that decides which steps…
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Substation Energy Metering: CT/VT Scaling and Commissioning Checks
Accept substation energy metering only after verifying the chain from primary conductors through instrument transformers and meter configuration to the reported energy register. Correct CT/VT ratios do not…
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Neutral Earthing System Selection: Fault Current, Continuity and Protection
Choose a neutral earthing system by deciding how the installation must behave during a phase-to-earth fault, then verifying that the source, connected loads, insulation and protection can support…
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Overhead Conductor Selection for Substations: Four Engineering Studies
Selecting a flexible bare conductor for an outdoor substation is not an ampacity lookup. The selected conductor, bundle, span and fittings must pass four linked studies: continuous and…
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Voltage Transformer Selection for Complex Substations
In a complex substation, select the voltage-transformer (VT) scheme from the functions and switching topology before selecting a device. Map every protection, metering, synchronism, control and automation function…
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Distribution Substation Basics: Equipment, Layout and Operation
A distribution substation receives electrical power at one voltage, switches and protects it, usually transforms it to a lower distribution voltage, and sends it through multiple outgoing feeders.…
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Why Raise the Power Factor? An Engineering Guide
Raising a low power factor reduces the current and apparent power needed to deliver the same real power. That can reduce distribution losses and voltage drop, release transformer…