What does high-pressure building engineering include and what knowledge does it include?

Building electricity includes: building power supply and distribution, building electrical lighting, building lightning protection and grounding, building weak current (including telephone communication system, cable TV system, closed-circuit TV system, fire control and anti-theft monitoring system), building electrical equipment, etc.

High voltage: High voltage includes system distribution lines, cables, cabinets, lighting appliances, switches, sockets, lightning protection grounding, system debugging, lighting and socket piping, power piping and wiring.

Weak current: weak current refers to security monitoring, integrated wiring, alarm system, etc. Within 32V.

I. Power supply and distribution system

1, power system

The voltage levels of (1) power system are 220/380V(0.4 kV), 3 kV, 6 kV, 10 kV, 20 kV, 35 kV, 66 kV, 1 10 kV, 220 kV, 330 kV and.

With the improvement of motor manufacturing technology, 10 kV motors have been mass-produced, so 3 kV and 6 kV are rarely used, and 20 kV and 66 kV are also rarely used. The power supply system is dominated by 10 kV and 35 kV. The transmission and distribution system is mainly above 1 10 kV.

There are two kinds of generators in power plants: 6 kV and 10 kV. Now 10 kV is the main generator, and all users are 220/380V(0.4 kV) low-voltage systems.

(2) According to the Code for Design of Urban Power Grid, the transmission networks are 500 kV, 330 kV, 220kV, 10kV, the high-voltage distribution networks are 1 10kV, 66 kV, and the medium-voltage distribution networks are 20kV,/kloc-0.

The power plant generates 6 kV or 10 kV power, which can be used by the power plant itself (auxiliary power) or sent to users with 10 kV voltage near the power plant. 10 kV power supply range is 10Km, 35kV is 20~50Km, 66kV is 30 ~ 10km,10kv is 50~ 150Km, and 220kV is/kloc.

(3) 1000V is the dividing line between high and low voltage, and the common grade voltages in industrial and civil buildings are 10kV and 380/220 v. ..

2. Power load classification

(1) main load.

The first-class load is the power load that will cause personal injury and great political and economic losses when the power supply is interrupted.

(2) Secondary load.

The secondary load will cause serious equipment damage, a large number of products will be scrapped, the continuous production process will be disrupted, and it will take a long time to recover, thus causing huge political and economic losses.

(3) Three-stage load.

The general load that does not belong to the primary and secondary loads is the tertiary load.

Among the above three types of loads, one type of load should generally be powered by two independent power sources, one of which is a standby power source.

(4) The power supply of the telephone room is a first-class load; Passenger elevators, domestic water pumps and drainage pumps in high-rise buildings are Class I loads.

3. Power load

Generally, it is divided into lighting load and electric load, but in civil buildings, air conditioning and electric heating equipment are classified as lighting load; Power load refers to elevators, pumps and fans, washing machines, etc.

4, voltage selection, power factor and reactive power compensation

When the installed capacity of electrical equipment is 250KW or the required transformer capacity is below 160KVA, the power supply should be low voltage. The power factor of high voltage power supply device should be above 0.9, and the power factor of low voltage power supply device should be above 0.85.