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Carelabs

IEEE 1584 · Engineering

Power System Study & Analysis - Carelabz Romania

Power system study and analysis solves the power flow equations that govern your electrical network, verifying that generators, lines, transformers, and shunt elements perform as intended, withstand expected stress, and are protected against failures. For a Romanian facility this brings together load flow analysis, short-circuit and fault analysis, and relay coordination into one connected study. Carelabs performs the full study in ETAP and delivers findings aligned with I7-2011.

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Getting the voltage right at both ends

A transformer tap is set once and rarely revisited. Set for the loaded condition it leaves voltage high at night; set for light load it leaves the far end of the plant low when production runs.

What We Deliver

Voltage across the full load range

Bus voltages are calculated at minimum and maximum demand, not at a single operating point, which is what reveals a tap setting that cannot satisfy both conditions.

WHY IT MATTERS

Low at the machine, high at the board

Equipment at the end of long feeders runs low while the switchboard sits comfortably within limits. Raising the tap fixes the far end and pushes the near end above tolerance, so the problem gets managed rather than solved.

  • Voltage assessed at the furthest point of each feeder against I7-2011 and SR HD 60364 limits, not only at the distribution board.
  • Minimum and maximum demand both modelled, since a tap satisfying one condition frequently breaches the other.
  • Transformer impedance and tap range taken from test certificates where available, because typical values shift the result materially.
  • Motor starting assessed where large drives exist, as starting dip adds to steady-state drop and can breach limits the static case passes.
  • Reactive compensation checked for resonance against existing harmonic content before it is recommended rather than after installation.
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DELIVERABLES

What you receive

Issued against I7-2011 and SR HD 60364, with the load basis and modelling assumptions stated.

  1. 1Bus voltage table at minimum and maximum demand with deviation from nominal
  2. 2Recommended tap position with the resulting voltage at both load extremes
  3. 3Volt drop by branch, separating transformer contribution from cable contribution
  4. 4Motor starting dip where significant drives are present
  5. 5Compensation options with a resonance assessment for each
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How the study runs

01

Establish the load range

Metered demand is collected across a full cycle so both the minimum and maximum conditions are real figures rather than estimates.

02

Record the present settings

Existing tap positions and any voltage regulation equipment are recorded, since the current condition is the baseline for any recommendation.

03

Build the model

The network is modelled in ETAP with transformer impedance and tap range from certificates, and cable data from verified schedules.

04

Solve both extremes

Voltage is calculated at minimum and maximum demand, which is what exposes a tap position that cannot satisfy the full range.

05

Separate the causes

Transformer and cable contributions to the drop are distinguished, because the remedy differs completely between them.

06

Report and recommend

A tap position is recommended with the resulting voltage at each extreme stated, alongside any cable or compensation work needed.

Frequently asked questions

Sometimes, but it shifts the whole profile rather than correcting one point. Raising the tap lifts the far end and also the near end, which can push the switchboard above tolerance at light load. Where the drop is mostly along the cable, the answer is usually the cable rather than the tap.
Because a tap set for the loaded condition leaves voltage high when load falls away, and high voltage shortens equipment life as surely as low voltage impairs performance. A setting can only be judged against both extremes, and assessing one alone is how a compromise becomes a problem at the other end.
By calculating drop branch by branch. If voltage is already low at the switchboard, the transformer or the supply is the cause. If it is acceptable there and low at the machine, the drop is along the feeder. They look identical from the equipment end and have entirely different remedies.
Where reactive flow is driving the drop, yes, and capacitor placement can be more effective than reconductoring. The caveat is resonance: adding capacitance to a network carrying harmonic distortion can amplify it. That check is part of the study rather than something to discover after the bank is installed.

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