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Load Steps

Load steps refer to the amount of load that will be placed on a genset at one time. A genset may accept load in one load step, or may spread it out over several load steps. The customer can identify the needs of the environment and then a proper method of starting can be applied. BMEP load step analysis is one system for developing a starting method.

Electric Power Applications, Engine and Generator Sizing (photo credit: cumminspowerblog.com)
Electric Power Applications, Engine and Generator Sizing (photo credit: cumminspowerblog.com)

Most loads do not draw power in a steady-state fashion; therefore, it is important to know the operating sequence and what else is running when loads are connected.


Prioritization

Prioritization is the process by which the customer identifies what electrical loads are needed and in what priority. The highest priority loads would be in the first step; even if all the gensets are not ready for load. The first genset ready to accept the load would take the first priority loads.

The next step would go to the next highest prioritized load. This process will repeat until all loads are applied. Smaller load steps equate to smaller transients, which result in a smoother transition.

For example, a medical center might prioritize lifesaving equipment as their number one need. That equipment (or special outlets for that equipment) would be the first supplied with electricity from the first available genset. Lights may be identified as the second most important need and handled by the second load step.

Title:Electric Power Applications, Engine and Generator Sizing – Caterpillar
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Electric Power Applications, Engine and Generator Sizing
Electric Power Applications, Engine and Generator Sizing

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7 Comments


  1. Leonard Musabayana
    Jan 04, 2024

    How do we derate cable size against a given load.


  2. Jeffrey Stroman
    Mar 24, 2018

    Just getting my feet wet with all this, suppose a swim club had 3 induction motors, 2 are 15 hp and one is 25 hp, all are 3 phase @ 240 volt, would standard kva calculations work or do multiple induction motors on one genset create new issues ie power factor, transients and or kva needed to start motors when others are online. I am eager to learn therefore greatly appreciate any feedback.


  3. Jackson Delahunt
    Jun 26, 2016

    Hi Edvard,

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    Do you have 30 mins to skype? I’m jackson.delahunt.

    Best,
    Jackson


  4. Ahmad Al-Sheikh
    Jul 07, 2013

    Thank you


  5. nmr
    Jul 31, 2012

    HOW TO SELECT THE SIZE OF THE XLPE 3 CORE FOR HT SYSTEM 33KV AND 11KV. AND FOR LT 415VOLTS-3PHASE 4CORE XLPE SIZE FOR A 100 KVA TRANSFORMER HAVING 1)33KV/440V. 2) 11KV/440V 3 PHASE
    URGENT PLEASE TELL THE FORMUL FOR SELECTING A XLPE CABLE


  6. nmr
    Jul 31, 2012

    HOW IS THE PERFORMANCE OF MAINTENANCE FREE EARTH ELECTRODES WHEN COMPARED WITH CONVENTIONAL EARTH ELECTRODE(GI PIPE)


  7. nmr
    Jul 31, 2012

    IN MV SYSTEM IF LOAD OF A WORKSHOP 3PHASE AT 44OV AC HOW MANY EARTH ELECTRODES ARE NEEDED

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