Design of electrical power supply for powerblock building
Our organization completed the installation and design of power supply networks of the energy block
DESIGNING POWER SUPPLY
This section of the project is made on the basis of the tasks of related specialties with the requirements of regulatory documents. The project provides for the power supply of power unit power consumers. The main electrical receivers are: - motors of ventilation systems; - convectors; - fan coil units; - electrical receivers workshops; - electric motors of pumps; - PVEM (computers); Power consumption is: - 118.6 kW (of which 63 kW is ventilation). In terms of ensuring the reliability of power supply, the power consumers of the power unit belong to category I and II and are powered from the KTP-4 low-voltage switchboard.
PROJECT DOCUMENTATION DESIGN
For the distribution of electricity in the power unit, switchboards are installed: - ЩВ1-1, ЩВ1-2, ЩВ2-1 - for ventilation systems; - ShchF1-1, ShchF1-2, ShchF2-1, ShchF3-1 - for fan coils; - ЩП-204 - ЩП-208 - for power supply of electrical equipment of workshops; - ЩОТ - for heating systems; - ЩК-1-1, ЩК3-1 - for PC; - ЩС-Н - for powering the pumps. Boards are installed in special niches or in serviced premises (in venkamerah). To control the fan motors, control boxes of type Ya5100 are installed. Turning off the fans in case of fire, see the automation project. Smoke exhaust fan power supply. The control of the fan coils is carried out with the help of control units supplied with the equipment. To supply the electric motors of the pumps (submersible and barrel), a switchboard SCH-H is provided, which is installed in room 125. This shield is ordered for this project and replaces the switchboard SCH-H ordered in the project. The power supply of computer boards (SCH) is performed according to the I category through the automatic reserve transfer (ATS) panels. Next to the PC cabinets (fire cock), control buttons (SB) are installed to activate the fire pumps in the existing lifting station II. The signal from the control buttons is displayed on the CK terminal box. Group networks are performed by cable VVGng-LS: - open: on walls, ceiling, on perforated strip, on cable structures. - it is hidden: in metal pipes behind a false ceiling, in DPL boxes (for computers); in the PVC pipe - in the penalty. Boxes taken into account in the arch. . The project adopted a distribution electrical network with a type of grounding system - TN-S. As the protective conductors (PE) - the fifth conductor in the three-phase distribution network with zero working is provided - the third conductor in the single-phase distribution and group network with zero working conductor. Protective measures are envisaged in accordance with the requirements of chapters 1-7 of the EMP, GOST R 50571 and other regulatory documents. As an additional measure of protection against electric shock, circuit breakers with a protective trip device of the RCD are installed on the group lines feeding the outlet network of the workshops. At the place of cable passage through the walls and their exit to the outside, in order to prevent water penetration and fire spreading, seal the gaps between the cable and the pipe, as well as the backup pipes with easily removable mass of fireproof material. Installation should be carried out in accordance with the applicable standards of PUE and SNiP. The system of equalization of potentials is solved as a whole on the Power unit and is given in arch. .
LIST OF WORK TYPES FOR WHICH IT IS NECESSARY TO DRAW UP THE CERTIFICATES OF HIDDEN WORKS 1. Laying metal pipes in a cement screed for clean floors. 2. Laying cables in a false ceiling.