Premium Membership ♕

CYBER WEEK OFFER 💥 Save 20% on PRO Membership Plan and Video Courses with the coupon CYM23 and learn from experienced engineers.

Home / Download Center / Electrical Engineering Books and Technical Guides / Power substation guides / Specification For Erection, Testing and Commissioning Of 66/11 kV Grid Substation

66/11 kV Substation

This specification is intended to cover complete design, engineering, assembling, testing at manufacturer’s works, substation building, complete erection, testing, commissioning and putting into successful commercial operation of 66/11 KV substation.

Specification For Erection, Testing and Commissioning Of 66/11 kV Grid Substation
Specification For Erection, Testing and Commissioning Of 66/11 kV Grid Substation (photo credit:

Supply and Transportation of all equipment and accessories, steel structures, all structural work, civil and architectural work, supply of all labour, supervision, tools, implements and supplies as required are included in requested specification as well.

The 66KV Air Insulated Double Bus Outdoor substation shall have following bays with necessary equipment and civil work:

  • Four (04) Feeder Bay
  • Three (03) Transformer bay
  • One (01) Bus Coupler bay and
  • Two (02) sets of Bus PT.

The substation shall have control room building with 11KV Indoor Switchgear, 66KV Control and Relay Panel, Battery Bank & Battery Charger, ACDB, DCDB etc. The indicative Layout Plan and Single Line Diagram of the substation is enclosed herewith.

Single line diagram of 66/11 kV substation (click to enlarge SLD):

Single line diagram of 66/11 kV grid substation
Single line diagram of 66/11 kV grid substation

Substation Capacity

Provision (Civil foundation for equipment structures, Power Transformer Foundation, Cable trenches, 66kV C&R panel, and 11kV Switchgear panels etc.) for 3rd 25 MVA Power Transformer shall be kept with turnkey execution of grid substation, so that the Transformer bay is ready in all respect for installation of 3rd Power Transformer in future.

System Parameters
System Parameters

11KV Switchgear

The 11KV Switchgear shall be installed inside the substation building. The switchgear shall be equipped with Vacuum circuit breaker. The metering and protection relays shall be part of switchgear only. Control voltage shall be 220 V DC.

66/11KV Power Transformer

The Outdoor Power transformer shall be 20/25MVA, ONAN/ONAF Rating with OLTC.

Battery Charger and Battery Bank

The Control supply shall be 220V DC. The Ni-Cd Battery bank shall be installed in separate room with proper ventilation system as per safety requirement. The battery charger shall be thyristor controlled installed inside control room building ad should be compatible with SCADA System.

Capacitor Bank

Two sets of Capacitor bank shall be installed outdoor. Each set shall be 7.2 MVAR rated at 11KV comprising two sub banks of 3.6 MVAR each. Each sub bank shall be provided with motorized 11KV Isolator.

66KV Control & Relay Panel

It is intended to provide State-of-Art substation control, protection and metering system and shall be integrated with SCADA system. The protection, metering & control system shall be as per SLD and specification of 66KV CRP.

The microprocessor based Transformer monitoring relay. All the relays/IED communications shall be on IEC 61850/Modbus protocol.

Title:Specification For Erection, Testing and Commissioning Of 66/11 kV Grid Substation – BSES Rajdhani Power Limited
Size:18.5 MB
Download:Here 🔗 (Get Premium Membership) | Video Courses | Download Updates
Specification For Erection, Testing and Commissioning Of 66/11 kV Grid Substation
Specification For Erection, Testing and Commissioning Of 66/11 kV Grid Substation

Premium Membership

Get access to premium HV/MV/LV technical articles, advanced electrical engineering guides, papers, and much more! It will help you to shape up your technical skills in your everyday life as an electrical engineer.
50% Discount 💥 - Save 50% on all 90+ video courses with Enterprise Membership plan.

More Information


    Apr 20, 2023


    Apr 17, 2023

    Only degree of Bachelor of Physics. Have to supervise. 11 KV panel erection and testing. Needs some tips to do so.

  3. Bharat
    Feb 24, 2023

    I get latest techno information from your website.

  4. Mohan Patil
    May 20, 2022

    Very useful to fresh Engineers and also field engineers…
    Keep it up.
    Mohan Patil

  5. Yogesh
    Apr 04, 2022

    Good info. Useful for project

  6. thirumurugan
    Jul 02, 2020

    i get lot of technical information from your website

Leave a Comment

Tell us what you're thinking. We care about your opinion! Please keep in mind that comments are moderated and rel="nofollow" is in use. So, please do not use a spammy keyword or a domain as your name, or it will be deleted. Let's have a professional and meaningful conversation instead. Thanks for dropping by!

92  −  eighty four  =  

Learn How to Design Power Systems

Learn to design LV/MV/HV power systems through professional video courses. Lifetime access. Enjoy learning!

Subscribe to Weekly Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and guides (PDF).
EEP Academy Courses - A hand crafted cutting-edge electrical engineering knowledge