Construction & Installation

Engineering, Procurement, Installation & Commissioning

Our Project Management Team (PMT) operates mainly within EPIC (Engineering, Procurement and Installation & Commissioning) contracts, that is, taking full charge of the entire process, from the engineering, to the supply of materials, and construction until the Customer’s performance requirements are met.

The customer has the advantage of supplying only the technical specifications describing the module requested, specifying the anticipated performance, the reference standards, and the contractual terms to be met. Following these specifications, the complete detailed engineering is developed and gradually submitted to the Customer for approval.

The development of an EPIC (Engineering, Procurement, Installation & Commissioning) order takes place in accordance with the following scheme.

Front-to-End activities related to tendering,

Follow-up & execution of orders by Design, Fabrication, Factory Acceptance Testing (FAT), Supply, installation, Hook-up with Plant existing System (Fire & Gas detection system, IT, Plant Paging System, Public Address System), Site Acceptance Test (SAT), Commissioning of Packaged Substations equipped with MV/LV Switchgears, HV/LV Bus ducts, Motor Control Center (MCC),Transformers, DC System with batteries, Internal Cabling system , Marshaling & Annunciator Panels , HVAC, Fire Alarm Control Panel (FACP) & Blast Resistance Module (BRM) Systems in the operation of Hazardous area.

What does a good grounding of the power S/S & Switching Station really mean?

Earthing for Safety

Provision of adequate grounding in a substation and switching stations are very important for the safety of operating personnel as well as electrical devices. Do not rise above tolerable thresholds and that the earth connection is rugged to dissipate the fault current to the earth.

The important of an effective, durable and a dependable earth for ensuring safety from electrical hazards does not require to be elaborated upon more. By earthing, connecting the electrical equipment to the general mass of the earth, this has a very low resistance.

Bonding, Grounding & Earthing

What is the difference? One of the most misunderstood and confused concept is difference between Bonding, Grounding and Earthing. Bonding is more clear word compare to Grounding and Earthing, but there is a micro difference between Grounding and Earthing. Earthing and Grounding are actually different terms for expressing the same concept.

Bonding

• Bonding is simply the act of joining two electrical conductors together. These may be two wires, a wire and a pipe, or these may be two Equipment. Bonding has to be done by connecting of all the metal parts that are not supposed to be carrying current during normal operations to bringing them to the same electrical potential.
• Bonding ensures that these two things which are bonded will be at the same electrical potential. That means we would not get electricity building up in one equipment or between two different equipment. No current flow can take place between two bonded bodies because they have the same potential.
• Bonding itself, does not protect anything. However, if one of those boxes is earthed there can be no electrical energy build-up. If the grounded box is bonded to the other box, the other box is also at zero electrical potential.
• It protects equipment and person by reducing current flow between pieces of equipment at different potentials.
• The primary reason for bonding is personnel safety, so someone touching two pieces of equipment at the same time does not receive a shock by becoming the path of equalization if they happen to be at different potentials. The Second reason has to do with what happens if Phase conductor may be touched an external metal part.
• The bonding helps to create a low impedance path back to the source. This will force a large current to flow, which in turn will cause the breaker to trip.
• Bonding to electrical earth is used extensively to ensure that all conductors (person, surface and product) are at the same electrical potential. When all conductors are at the same potential no discharge can occur.

Grounding

• Grounding means connecting the live part (it means the part which carries current under normal condition) to the earth for example neutral of power transformer.
• It is done for the protections of power system equipment and to provide an effective return path from the machine to the power source.
• For example, grounding of neutral point of a star connected transformer. Grounding refers the current carrying part of the system such as neutral (of the transformer or generator).
• Because of lightening, line surges or unintentional contact with other high voltage lines, dangerously high voltages can develop in the electrical distribution system wires.
• Grounding provides a safe, alternate path around the electrical system of your house thus minimizing damage from such occurrences. Generally Black wire is used for this as a nomenclature. All electrical/electronic circuits (AC & DC) need a reference potential (zero volts) which is called ground in order to make possible the current flow from generator to load.
• Ground is May or May not be earthed. In Electrical Power distribution it is either earthed at distribution Point or at Consumer end but it is not earthed in Automobile (for instance all vehicles’ electrical circuits have ground connected to the chassis and metallic body that are insulated from earth through tires).

Earthing

• Earthing means connecting the dead part (it means the part which does not carries current under normal condition) to the earth for example electrical equipment’s frames, enclosures, supports etc.
• The purpose of earthing is to minimize the risk of receiving an electric shock if touching metal parts when a fault is present. Generally green wire is used for this as a nomenclature.
• Under fault conditions the non-current carrying metal parts of an electrical installation such as frames, enclosures, supports, fencing etc. may attain high potential with respect to ground so that any person or stray animal touching these or approaching these will be subjected to potential difference which may result in the flow of a current through the body of the person or the animal of such a value as may prove fatal.
• To avoid this non-current carrying metal parts of the electrical system are connected to the general mass of earth by means of an earthing system comprising of earth conductors to conduct the fault currents safely to the ground.
• Earthing has been accomplished through bonding of a metallic system to earth. It is normally achieved by inserting ground rods or other electrodes deep inside earth.
• Earthing is to ensure safety or Protection of electrical equipment and Human by discharging the electrical energy to the earth.
• There may exist a neutral to ground voltage due to voltage drop in the wiring, thus neutral does not necessarily have to be at ground potential. In a properly balanced system, the phase currents balance each other, so that the total neutral current is also zero. For individual systems, this is not completely possible, but we strive to come close in aggregate. This balancing allows maximum efficiency of the distribution transformer’s secondary winding. Micro Difference between earthing and Grounding There is no major difference between earthing and Grounding, both means “Connecting an electrical circuit or device to the Earth”. This serves various purposes like to drain away unwanted currents, to provide a reference voltage for circuits needing one, to lead lightning away from delicate equipment. Even though there is a micro difference between grounding and earthing: That is Difference in Terminology.
• In USA term Grounding is used but in UK term Earthing is used