Secondary Design Engineering – SAS

Our Services

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At Ishara Engineering Services, we specialize in Secondary Design Engineering with and without Substation Automation Systems (SAS), delivering end-to-end solutions for AIS and GIS substations up to 765kV. Our designs combine technical precision, advanced software tools, and rigorous quality checks to ensure safe, reliable, and efficient operation of substations.

What We Do

Electrical Drawings & Documentation

Preparation of Single Line Diagrams (SLDs), schematics, wiring diagrams, and control layouts.
Modification, re-detailing, and optimization of existing drawings.
BOQ preparation for secondary systems and equipment.

SAS Architecture & Integration

Development of SAS architecture and network drawings, aligned with latest IEC standards.
Integration of Intelligent Electronic Devices (IEDs), BCUs, RTUs, and SCADA systems.
Site-selectable design flexibility for both greenfield and brownfield projects.

Technical Calculations & Interlocks

AC/DC load calculations for precise equipment sizing.
Development of interlocking schemes to ensure safe and error-free operations.
Creation of mimic diagrams and operating logic for operator-friendly interfaces.

Standards & Compliance

Designs developed in compliance with national and international standards.
Opto-isolated inputs/outputs and robust SAS communication protocols for system reliability.
Future-ready layouts ensuring smooth upgrades and scalability.

Deliverables We Provide

SLDs, Schematics, and Wiring Diagrams
SAS Network Architectures
BOQs & Procurement Documentation
AC/DC Load Calculations
Mimic Diagrams and Interlock Logics
Technical Datasheets and Specifications
Review Reports and Quality Checklists

Why Choose Us for SAS Design?

✅ Accuracy First – Every drawing undergoes multiple internal reviews before submission.
✅ Advanced Tools – Latest CAD and design software used for efficiency and precision.
✅ Flexibility – Capable of handling both AIS & GIS substations across multiple voltage levels.
✅ Cost-Efficiency – Optimized designs reduce material costs and project lead time.
✅ Future-Ready – Our SAS architectures are designed to support digital substations and smart grid migration.

Applications

Our Secondary Design Engineering – SAS services are trusted in:

Transmission and distribution substations (AIS & GIS).
Process industries requiring reliable automation and protection systems.
Legacy substations needing modernization and SAS migration.
Greenfield projects requiring complete design from scratch.