A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Between the generating station and consumer, electric power may flow through several substations at different voltage levels. A substation may include transformers to change voltage levels between high transmission voltages and lower distribution voltages, or at the interconnection of two different transmission voltages.
The substations apart from the distribution of the electricity have many other functions as follows:
- 1.Step up and step down of the voltage for transmission and distribution: As for the same power transmitted at a higher voltage the current is lower it results in lower transmission losses, hence is the need of stepping up and stepping down the voltage.
- 2. Switching and isolating the circuits for maintenance: Switching is also an important function of substations. Closing down a feeder circuit when the load demands are high needs to be done for the safety of the generating plants. Switching high voltages is a dangerous work, and special circuit breakers like air circuit breakers and oil circuit breakers for quenching the arcs have to be used.
- 3. Load shedding: When the power demand is more than the supply, the substations do load shedding on distribution circuits to maintain balance.
- 4. Correction of power factors circuits: The power factor has to be kept at the correct value when reactive loads are there to protect the generating plant and increase efficiency.
- 5. Safety devices like circuit breakers and fuses: These safety devices are provided for protecting the machineries on the distribution circuit as well as in the substation against high short circuit currents.
- 6. It contains bus bars for splitting the power for distribution: Thick bars of copper to which various distributing circuits are connected by nuts and bolts are known as bus bars.
Sectors We Serve:
- 1. High Voltage: PES is a leader in installation 220/132/33 kV Grid Substations, both indoor and outdoor. Highly skilled engineers, technicians and availability of tools and machinery being our main strengths. We are one of preferred installer among the substation construction community.
- 2. Medium Voltage: PES undertakes turnkey medium voltage systems from conceptualization to commissioning by providing cutting-edge technology across the industry which are tailored to the need of customers. In housed skill, competency, tools and machinery lead, achieve beyond expectations of our clients.
- 3. Low Voltage: PES undertakes turnkey low voltage systems from conceptualization to commissioning by providing latest technology to our clients. Manufacturing plants, high rise commercial and apartment buildings have been our main focusing sectors, where high competency levels and timely delivery is required.
- 4. Extra Low Voltage: Installation of Building Management Systems (BMS), CCTV systems, MATV Systems, PA Systems, DATA networks, fire protection systems, fire detection systems, access control Systems, energy monitoring systems and instrumentation systems are our main focus areas in the industry.
- 5. Hydro Power Plants: PES has the competency and capability of total supply, erection, testing and commissioning of electro mechanical systems for mini-hydro power plants.
- 6. Wind Power Plants: PES is one of the preferred service providers for supply, installation, testing and commissioning of electrical system on wind power plants.
- 7. Solar System: We are one of the leading solution providers for solar net metering systems. We undertake all kinds of supply and installation work related to solar electricity power generating systems.
- 8. Ship Building Industry: PES undertake ship repairing, ship electrical and instrumentation systems installation and maintenance and also total electrical system installer for new ship buildings.
- 9. Overhead Transmission Line: We are one of the preferred installers for 220/132/33 kV transmission lines in erection of towers, cable stringing, cable termination and jointing.
- 10. Underground Cable Laying and Transmission: NRE undertake both underground and over-ground cable laying and termination work, including supply in any voltage level. Highly skilled and competence cable jointers are our main strength. Our qualified engineers designs systems for newest IET/IEEE standards.
- 11. Maintenance and Services: We are providing annual maintenance services for power transformers, HT panels, LT panels, cables, and protection systems. Transformers oil filtration, oil BDV testing, insulation testing, protection relay testing, rust removing and painting are few of services we carry out.
- 12. Earthing and Lightening Protection System: NRE is one of the leading earthing and lightning protection system installers in Sri Lanka for factories, commercial and apartment buildings, communication towers, water towers, etc.
- 13. Fabrication: PES is the preferred fabricator for all kinds of fabrication work including cable gantries, transmission towers, base frames, ladders FABRICATIONS and various types of customized brackets, etc.
- 14. Industrial Lighting: We offer innovative lighting solutions that begin from conceptualization, design, supply, installation, testing and commissioning that cover industrial, commercial and roads.
- 15. Power Generation: We offer diesel powered generators for temporary power needs of our clients.
- 16. Converted Containers: Our customized converted containers for offices and storage facilities are widely accepted in the industry for making temporary operation facilities. We have both AC and Non-AC, and storage cabins for our clients.
HIGH VOLTAGE:
PES is a leader in installation 220/132/33 kV Grid Substations, both indoor and outdoor. Highly skilled engineers, technicians and availability of tools and machinery being our main strengths. We are one of preferred installer among the substation construction community.
Our Capabilities:
- ◈ Supply & installation of 220KV, 132KV outdoor switchgears
- ◈ Supply & installation of 220KV, 132KV indoor switchgears
- ◈ Supply & installation of power transformers
- ◈ Transportation, unloading and positioning of indoor/ outdoor switchgears, and power transformers
- ◈ Supply & installation of earthing system
- ◈ Supply & installation of lightning protection system
- ◈ Supply & installation of outdoor gantry yards
- ◈ SF6 gas filling
- ◈ Testing & commissioning of indoor/ outdoor switchgears
- ◈ Testing & commissioning of protection relays
- ◈ Oil filtration and testing of power transformers
- ◈ Supply & laying of HT cables and terminations of cables
- ◈ Supply & installation of power generators
- ◈ Supply & installation of auxiliary power backups
- ◈ Supply & installation of indoor & outdoor lighting solutions
MEDIUM VOLTAGE:
PES undertakes turnkey medium voltage systems from conceptualization to commissioning by providing cutting-edge technology across the industry which are tailored to the need of customers. In housed skill, competency, tools and machinery lead, achieve beyond expectations of our clients.
Our Capabilities:
- ◈ Supply & installation of 33kV & 11kV outdoor switchgears
- ◈ Supply & installation of 33kV & 11kV indoor switchgears
- ◈ Supply & installation of power transformers
- ◈ Transportation, unloading and positioning of indoor/ outdoor switchgears, and power transformers
- ◈ Supply & installation of earthing system
- ◈ Supply & installation of lightning protection system
- ◈ Supply & installation of outdoor gantry yards
- ◈ SF6 gas filling
- ◈ Testing & commissioning of indoor/ outdoor switchgears
- ◈ Testing & commissioning of protection relays
- ◈ Oil filtration and testing of power transformers
- ◈ Supply & laying of HT cables and terminations of cables
- ◈ Supply & installation of auxiliary power backups
- ◈ Supply & installation of indoor & outdoor lighting solutions.
LOW VOLTAGE:
PES undertakes turnkey low voltage systems from conceptualization to commissioning by providing latest technology to our clients. Manufacturing plants, high rise commercial and apartment buildings have been our main focusing sectors, where high competency levels and timely delivery is required.
Our Capabilities:
- ◈ Supply & installation of main switchboards
- ◈ Supply & installation changeover switchboards
- ◈ Supply & installation bus ducts and riser feeders
- ◈ Power and control wiring for process and manufacturing equipments
- ◈ Supply & installation of earthing system
- ◈ Supply & installation of lightning protection system
- ◈ Testing & commissioning
- ◈ Supply & laying of cables and terminations of cables
- ◈ Supply & installation of indoor & outdoor lighting solutions
- ◈ Cable relocation
- ◈ Generator system installations
- ◈ Equipment relocation
- ◈ Cable tracing and fault rectification
EXTRA LOW VOLTAGE:
Installation of Building Management Systems (BMS), CCTV systems, MATV Systems, PA Systems, DATA networks, fire protection systems, fire detection systems, access control Systems, energy monitoring systems and instrumentation systems are our main focus areas in the industry.
Our Capabilities:
- ◈Installation of fire system
- ◈Installation of BMS (Building Management System)
- ◈Installation of CCTV systems
- ◈Installation of PAS (Process Automation System)
- ◈Supply & laying of control cables and terminations of cables
- ◈Supply & installation of indoor & outdoor lighting solutions
- ◈Installation of MATV systems
UNDERGROUND CABLE LAYING & TERMINATION:
PES undertakes both underground and over-ground cable laying and termination work, including supply in any voltage level. Highly skilled and competence cable jointers are our main strength. Our qualified engineers designs systems for newest IET/IEEE standards.
Our Capabilities:
- ◈Supply & laying of HT & LV cables
- ◈Supply of end termination and joining kits for cables
- ◈Termination of HT and LV cables
- ◈Testing of HT & LV cables
HYDRO POWER PLANTS:
PES has the competency and capability of total supply, erection, testing and commissioning of electro mechanical systems for mini-hydro power plants.
Our Capabilities:
- ◈Installation of mechanical structures
- ◈Supply & installation of indoor switchgears both medium voltage and low voltage
- ◈Supply & installation of outdoor switchgears
- ◈Installation of outdoor switchyards
- ◈Supply & installation of earthing system and lightning protection system
- ◈Supply & installation of power transformers
- ◈Installation of control systems
- ◈Installation of generators
- ◈Installation of fire protection systems
- ◈Supply of cables (both LV & HT) and laying
- ◈Cable terminations
- ◈Supply & installation of indoor and outdoor lightings
MAINTENANCE AND SERVICES:
We are providing annual maintenance services for power transformers, HT panels, LT panels, cables, and protection systems. Transformers oil filtration, oil BDV testing, insulation testing, protection relay testing, rust removing and painting are few of services we carry out.
Our Capabilities:
- ◈Power transformers service and testing
- ◈Transformers oil filtration
- ◈HT panel service and testing
- ◈LT panel service and testing
- ◈Power cable testing and tracing
- ◈Fault finding of electrical systems
- ◈Service of overhead power lines
- ◈Painting and rust removing of transformers and structures
- ◈Infrared thermography survey
