Manufacturing process of sub-stational equipments at energypac engineering Ltd.

Abstract

In this report we discussed about our observations at the factory of EnergyPac Engineering Ltd. EnegyPac mainly produces substational equipments, which are basically four types. These types are: Breaker & Isolator, Instrument transformer (CT/PT), Transformer (Power & Distribution), Switchgear. we have also visited some supporting sections, these are: Fabrications, CNC, Powder coating & paint and MlC shop Breakers and Isolators are used for tripping the system. EnergyPac manufactures only Vacuum circuit breaker (VCB). The name of a breaker is determined by the medium in which the arc is extinguished. By using the vacuum interrupter VCB is produced. When the breaker is tripped, for high voltage arc is created. But as the medium is vacuum so the arc is extinguished. EnergyPac manufactures three types of Isolators. These types are pantograph, centre break and double break. In the transformer section we discussed our observations in the power & distribution transformer section. A transformer is a device that can transfer energy from one circuit to another by electromagnetic induction. Basically the main part of transformer is core and coil. In this section we discussed about the selection and formation of core and coil, assembly of core and coil , protections and tests of transformer. In the switchgear section of the report we discussed our observations in the switchgear section of EnergyPac. Switchgear is used for protection and controlling of a system. EnegyPac manufactures two types of switchgears, one is L T switchgear and the other one is HT switchgear. In L T switchgear, relay senses the over current and sends trip signal to breaker. Then the beaker is tripped. If the power factor (PF) is decreased, then power factor improvement (PFT) capacitors are added to the load to improve PF of the system. In HT switchgear, microprocessor based relay senses all things and if fault occurs it sends a signal to general relay. Relay sends trip signal to VCB. Then the VCB is tripped. There are two types of instrument transformers, current transformer (CT) and potential transformer CPT). The manufacturing process is almost same. The raw material of core is cold rolled grain oriented (CRGO) silicon steel and the raw material of coil is copper enameled wire. After the assembly the core and coil, these are tanked up. For insulation process of the system insulation paper, oil and varnish is used. This CT and PT are used for measurement. When we worked on the EnergyPac, we got opportunities to observe the entire manufacturing processes of substational equipments. We tried our best to learn and know everything from the honorable engineers of EnergyPac.