Substations

Substation

Overview

A Substation is a key component of the power system, responsible for transforming voltage levels, controlling power flow, and ensuring the safe and reliable distribution of electricity to consumers. Substations serve as the central link between power generation plants, transmission networks, and distribution systems. They contain advanced electrical equipment such as power transformers, switchgear, protection relays, busbars, control panels, and SCADA monitoring systems.

Modern substations are designed with robust grounding systems, automation technologies, and high-level protection schemes to ensure grid stability, minimize outages, and maintain the quality and safety of electrical energy.

Types of Substations

1. Based on Voltage Level

High Voltage Substations (HV): 110 kV – 132 kV

Extra High Voltage Substations (EHV): 220 kV – 400 kV

Ultra High Voltage (UHV): 500 kV and above

2. Based on Construction Type

AIS (Air Insulated Substation)

GIS (Gas Insulated Substation)

Hybrid Substations

Underground / Indoor Substations

3. Based on Function

Step-Up Substation (near power plants)

Step-Down Substation (near consumers)

Switching Substation

Distribution Substation

Industrial Substation

Atrace Company Substation Services

At Atrace Production and Renewal Electricity Company, we provide complete solutions for the engineering, design, supply, installation, testing, commissioning, and maintenance of HV/EHV substations.

Our services cover full EPC (Engineering–Procurement–Construction) responsibilities.

1. Engineering & Design

Conceptual & Detailed Design

Single Line Diagrams (SLD)

Substation layout plans (AIS/GIS)

Electrical design calculations

Short-circuit and load flow studies

Protection and coordination studies

Earthing and grounding system design

Control room layout and SCADA system design

Cable routing, trenching, and ducting design

Civil & Structural Engineering

Foundation design for transformers, towers, and equipment

Control building design

Equipment support structures

Cable trench and duct bank design

Perimeter walls and fencing

Mechanical Design

HVAC for GIS and control rooms

Fire detection and firefighting systems

Oil containment systems (bund walls for transformers)

2. Procurement & Supply

Atrace provides complete procurement of high-quality equipment from trusted international manufacturers:

Primary Equipment

Power Transformers (5 MVA – 250 MVA)

Instrument Transformers (CTs, VTs, CVTs)

Circuit Breakers (SF6, Vacuum)

Disconnect Switches (Isolators)

Busbars and Connectors

GIS Modules

Surge Arresters

Secondary Equipment

Protection relays

Control panels

SCADA and RTU systems

Batteries and chargers

Cables (control, LV, MV, HV)

Auxiliary Systems

Earthing materials

Lightning protection systems

Fire safety equipment

Communication systems (OPGW, fiber cables)

3. Construction & Installation

Our expert technical teams carry out complete civil, electrical, and mechanical installation:

Civil Works

Excavation and foundation construction

Control building construction

Cable trenches and ducts installation

Fencing, gates, and access roads

Electrical Installation

Assembly and erection of transformers

Installation of GIS/AIS switchgear

CTs, VTs, surge arrester installation

Cable laying, termination & jointing

Busbar installation

Earthing system installation

Battery bank and DC system setup

Mechanical Works

HVAC installation

Fire protection systems

Transformer oil filling and filtration

Steel structure installation

4. Testing & Commissioning

Before energization, all equipment is subjected to detailed testing:

Primary Testing

Transformer ratio and insulation tests

CT/VT accuracy tests

Circuit breaker timing tests

Contact resistance measurements

Busbar and cable insulation tests

Secondary Testing

Protection relay configuration and testing

SCADA and communication system testing

Logic and interlock verification

Functional testing of control panels

Final Commissioning

System energization

Performance verification

Integration with the power grid

5. Maintenance & After-Sales Services

Atrace provides continuous support after project completion:

Preventive maintenance programs

Transformer oil testing (DGA)

Protection relay recalibration

Emergency repair and troubleshooting

Upgrading AIS to GIS

Capacity enhancement and equipment replacement

Why Choose Atrace for Substation Projects?

Expert engineering & design team

Proven experience in HV/EHV projects

Supply of international standard equipment (IEC/IEEE)

Strict quality and safety control

Reliable technical support and fast response

Complete EPC turnkey solutions.