Electrical equipment and electrical lighting of the liquor production shop

Electrical part

1. General Data

This section of the project deals with the reconstruction of power electrical equipment and electrical lighting of the liquor shop with a capacity of 2 million dal/year at

The project was developed on the basis of:

- design tasks;

- architectural and construction drawings;

- tasks of adjacent sections of the project;

applicable codes and rules of construction design: SP 31-110-2003, PUE issue 6, issue 7, etc.

Key Project Indicators

№

p/n

Indicator name

Ed. ism.

Value of the indicator

Note

1

Mains voltage

In

380/220

2

Installed capacity

electroreceivers

kW

1291

3

Design capacity

electroreceivers

kW

831

4

Average value

power factor

-

0, 86

2. Power supply

Power supply of the reconstructed building is carried out from a separate transformer substation for 380/220 V with TN-C-S grounding system with four cable lines from different sections of TP.

Two UVR8504M type I/O switchgears are provided to provide power to the consumers of the designed building. The switchgears are installed in the electrical switchboard room, which is located on the first floor of the building.

Electric power is accounted for by transformer switching counters installed in SHU-2 remote metering cabinets (electrical switchboard room).

3. Power electrical equipment

The main consumers of electricity are electric receivers of technological and ventilation equipment and lighting. All engines are supplied complete with equipment. Electrical receivers of the facility by the degree of reliability belong to category II and III of the power supply, with the exception of emergency ventilation, smoke removal system, fire pumps, fire automation, power supply of which is provided by category 1 with ATS device at the input. The design provides for power supply of electric receivers of category I from the third source - diesel generator.

Power supply voltage of 380V motors. Electrical equipment installed in areas of category B-Ia has the degree of protection of ExdIIBT5 - increased reliability against explosion, in areas of B-Ib and fire hazardous rooms - a shell with a degree of protection of at least IP54.

To protect electrical receivers from short circuit and overload, the design provides for start-up and protection equipment installed in boards and boxes of Y5000 type installed in the electrical room. Only push-button control posts in the design of the ExdIIBT5 are installed at the place in explosive rooms.

The design provides for shutdown of ventilation in case of fire using magnetic starters installed in power supply cabinets.

4. Electric lighting.

The design provides for two types of lighting - working and emergency. Lighting control - local from switches installed near the entrance in normal rooms and from boards installed outside explosive zones for category rooms. The voltage of the lamps is 220V AC. It is provided to install boxes with a 220/42B step-down transformer for connection of portable lighting in electrical panels and ventilation chambers. Luminaires with fluorescent lamps, provided in the design, have the degree of protection of 2ExedIICT4 in rooms of category B-Ia, IP65 - in rooms of category B-Ib, and IP54 in fire hazardous rooms.

1. Design of internal networks

Distribution networks in explosive rooms are made by armoured cable with copper cores of HBbShv type, and IWGng cable in other rooms is opened by trays. Openings in the walls and in the floor for the passage of cables must be tightly sealed with non-combustible materials. It is forbidden to lay transit wiring through explosive zones. It is allowed to lay them in pipes, in closed boxes, in floors. Three-phase groups are made five-wire, single-phase - three-wire with a separate protective PE conductor. Lighting networks shall be made with IWGng cable with copper cores and non-combustible insulation open and in steel ducts. Do not lay circuits of working and emergency lighting in one duct.

1. Protective measures.

Protection against electric shock is provided by a protective bolt made in accordance with Chapter 1.-7 of PUE, Issue .7. A fifth cable core is used as a zero protective conductor in power networks, and a third protective core is used in lighting networks.

At the input to the building, perform potential equalization in accordance with cl. PUE 7.1.87 and 7.1.88. Make the main grounding bus of GWZ copper. Connect the following to GWB:

- main (main) conductors PE

-metallic pipes of utilities included in the building (pipes of hot and cold water supply, sewerage, heating, etc.

-metalloconstructure of the building

-metallic parts of centralized ventilation systems.

In the room, the electrical panel design provides a set of protective equipment for servicing electrical installations .

1. Static and lightning protection.

Protection against static electricity is performed in accordance with the "Rules for protection against static electricity in the production of the chemical, petrochemical and oil refining industries."

In explosive rooms for protection against static electricity, a 40x4 strip steel circuit is performed, to which pipelines, current-conducting parts of process equipment and metal structures are connected.

The electrostatic induction protection circuit is connected to the existing protective boring system.

Lightning protection of the designed object is performed in accordance with RD 34.24.122-87. On the roof there is a mesh, measuring 6m x 6m, made with a strip of 40x4mm. Lightning-belt mesh is connected by lightning outlets made by strip 40x4mm with external grounding circuit not less than in 25 m along roof perimeter. As an artificial grounding conductor, rods made of round steel Æ10mm are used, connected by welding with a loop made of 40 x 4 strip laid around the perimeter of the building.