technical specifications for the erection, testing, and commissioning of a 33/11KV ITPO GIS grid substation:
1. General Information:
- Project title, location, and purpose.
- Reference to relevant standards and codes.
2. Scope of Work:
- Clear delineation of tasks for erection, testing, and commissioning.
- Description of the 33/11KV ITPO GIS grid substation components.
3. Site Preparation:
- Requirements for site clearance, excavation, and foundation construction.
- Specifications for earthing and grounding systems.
4. GIS Equipment Erection:
- Detailed instructions for the installation of Gas Insulated Switchgear (GIS).
- Handling, storage, and transportation guidelines for GIS components.
5. Electrical Connections:
- Wiring diagrams and cable schedules.
- Procedures for connecting transformers, circuit breakers, and other electrical components.
6. Testing Procedures:
- Comprehensive testing protocols for each component and the overall system.
- Performance testing, including load testing and insulation resistance testing.
7. Commissioning:
- Sequence of commissioning activities.
- Functional testing and integration of subsystems.
8. Safety Measures:
- Safety guidelines for all stages of the project.
- Emergency procedures and protocols.
9. Documentation:
- Requirements for as-built drawings and documentation.
- Test reports and commissioning certificates.
10. Quality Assurance:
- Quality control measures for equipment and installation.
- Inspection and acceptance criteria.
11. Training:
- Training programs for operating and maintenance personnel.
- Documentation for future reference and troubleshooting.
12. Project Schedule:
- Detailed project timeline with milestones for each phase.
Note: This is a general outline, and specific details would depend on project specifics and regulatory requirements. Always consult with relevant standards and professionals in the field to ensure accuracy and compliance.
Technical Specification for Erection, Testing, and Commissioning of 33/11kV ITPO GIS Grid Substation
A 33/11kV GIS (Gas Insulated Switchgear) grid substation is a critical infrastructure component for ensuring reliable power distribution in urban and industrial areas. The following technical specification outlines the requirements for the erection, testing, and commissioning of such a substation.
1. Scope of Work
The work includes, but is not limited to:
- Erection: Installation of all GIS equipment, transformers, auxiliary systems, and control panels.
- Testing: Comprehensive testing of all components, ensuring compliance with design specifications.
- Commissioning: Final integration of the substation into the power network and ensuring operational readiness.
2. Technical Specifications
A. General Requirements
Standards Compliance:
- IEC 62271: High-voltage switchgear and control gear.
- IEEE and IS standards for electrical systems.
- Relevant safety and environmental regulations.
Site Preparation:
- Construction of substation buildings and GIS rooms.
- Installation of fire suppression systems and ventilation.
B. Equipment Specifications
Gas Insulated Switchgear (GIS):
- Rated Voltage: 36 kV.
- Insulation Medium: SF₆ gas (environment-friendly alternatives preferred).
- Internal Arc Classification: IAC AFLR as per IEC 62271.
- Circuit Breakers: Minimum breaking capacity of 25 kA for 3 seconds.
Power Transformers:
- Voltage Ratio: 33/11kV.
- Capacity: As per project requirements (e.g., 10 MVA, 20 MVA).
- Cooling Type: ONAN/ONAF.
- Tappings: +/- 10% in 1.25% steps for voltage adjustment.
Busbars:
- Enclosed in SF₆ gas-filled chambers.
- Rated Current: As per system design, typically 1250A or higher.
Protection and Control System:
- Numerical relays for overcurrent, earth fault, and differential protection.
- SCADA integration for remote monitoring and control.
- Fault recorders and event loggers.
Auxiliary Systems:
- DC supply systems with battery banks and chargers.
- HVAC systems for GIS rooms.
- Fire detection and suppression systems (gas-based or water mist).
3. Erection Specifications
A. Installation of GIS Equipment
- Alignment and anchoring of GIS panels as per layout drawings.
- Assembly of busbars, circuit breakers, and isolators in SF₆ compartments.
- Gas filling and leakage testing to ensure proper sealing.
B. Installation of Transformers
- Placement of transformers on plinths or pads with anti-vibration measures.
- Oil filling, filtration, and testing.
- Earthing of transformer tanks and neutral points.
C. Cable Laying and Terminations
- High-voltage (33kV) and medium-voltage (11kV) cable laying as per approved routes.
- Terminations with heat-shrink or cold-shrink kits.
- Separation of power and control cables to prevent interference.
D. Earthing and Bonding
- Installation of an earthing grid, electrodes, and connections to all equipment.
- Ensuring earth resistance below specified limits (e.g., <1 ohm).
4. Testing Specifications
A. Pre-commissioning Tests
GIS Equipment:
- SF₆ gas purity and pressure tests.
- Contact resistance measurement of circuit breakers and isolators.
- Partial discharge measurement.
Transformers:
- Insulation resistance (IR) test.
- Transformer turns ratio (TTR) test.
- Magnetic balance and core loss tests.
Cables:
- High-potential (HiPot) testing for insulation strength.
- Continuity and polarity checks.
Protection System:
- Secondary injection testing of relays.
- Verification of trip circuits and interlocks.
B. Functional Tests
- Control circuit simulations and SCADA integration tests.
- Synchronization of substation with the existing network.
- Load testing under simulated conditions.
5. Commissioning Procedures
A. Energization
- Verify clearance from relevant authorities before energizing.
- Gradual energization of equipment, starting from the 33kV side.
- Monitor transformer parameters such as temperature, voltage, and load.
B. Final Acceptance Tests
- Stability tests for protection systems.
- Measurement of operational parameters like voltage regulation and harmonic distortion.
- Ensure compliance with all performance guarantees.
6. Safety Measures
- Use of personal protective equipment (PPE) and adherence to safety protocols.
- Gas leakage detectors for SF₆ monitoring.
- Emergency response plans, including evacuation procedures.
7. Documentation and Handover
- As-built drawings and installation manuals.
- Test reports for all pre-commissioning and commissioning activities.
- Training for operational personnel on system management and troubleshooting.
This specification ensures a systematic and safe approach to erecting, testing, and commissioning a 33/11kV GIS grid substation, contributing to reliable and efficient power distribution in compliance with international standards.
