GAHUM

Tutorial draft for review

Import a case and read its Import Report

Import an original five-bus RAW example and identify assumptions, warnings, and omitted records. Tutorial draft for review.

By LotteWare Solution. Tutorial draft.

Import the original RAW file, read defaults, warnings and dropped records, then review the supported Power System.
Workflow illustration for the RAW teaching file. Its Import Report identifies two dropped switched-shunt records.

This exercise uses an original five-bus importer example authored for GAHUM. It demonstrates supported RAW revision 32 records. It is not a vendor-produced case or a certificate of complete format compatibility.

1. Get the teaching file

Download the five-bus RAW import example. It is plain text. The file starts with the case title GAHUM FIVE BUS IMPORT STUDY.

This is a different electrical case from the original 5-bus preset in the first guide. Its names, topology, and values were authored for importer coverage.

2. Import the file

Importing replaces the current Power System. Use a separate browser profile if you have a study to keep.

  1. Open GAHUM and select Show editor if the controls are hidden.
  2. Find PSS/E Import in the editor controls.
  3. Choose the downloaded file with the RAW file picker. Wait for the loaded-file message.
  4. Select Import PSS/E case.

The imported Power System has five buses, five branches, and two generators. Two circuits connect buses 1 and 2. A transformer connects buses 3 and 4, which have different voltage bases.

3. Read the Import Report before solving

The Import Report explains how the source became a Power System. Read these parts separately:

  • Format and counts: identify the detected format and the resulting electrical elements.
  • Defaults: values the source did not state and the importer supplied. A stated value equal to a default is not an omission.
  • Warnings: assumptions, repairs, or limitations that need review.
  • Dropped records: source material that the imported model does not carry.

This file includes two switched-shunt records. The Import Report identifies those records as dropped. A successful import therefore does not mean the imported model preserves every control in the file.

Check the parallel circuits, transformer, loads, and generators in the editor. Do not infer that a visually plausible SLD proves the imported values are correct.

4. Decide whether the imported case fits the study

For this exercise, select Run Load Flow to inspect the supported steady-state model. For another study, first decide whether any omitted controls or assumptions affect your question. A result can converge while representing a different model from the source.

Read the example sources and assumptions and research-use terms before relying on a result.