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Some graphics, characters, symbols, codes, functions and functions in the complete power distribution system

 

Relevant national standards meaning:

In the complete power distribution system, the working and control voltages are distinguished by alternating current (AC) direct current (DC) 100mm copper bend, "J, Z", AC, DC, (+, -), the AC rated voltage is 380V, 220V, 10KV, 6KV, referred to as low pressure and high pressure. Circuit diagrams include primary system diagrams, electrical plane layout diagrams, control protection diagrams (also called schematic diagrams), and secondary wiring installation diagrams. As those who participate in production and install complete sets of products, we should know, understand, and be familiar with most graphics, text, Symbol, code, function and function, meaning.

The meaning of symbols commonly used in electrical construction drawings:

U: voltage, unit "V"

I: current, unit "A"

R: resistance, unit "Ω"

U: rated voltage

UE: rated operating voltage

UI: rated insulation voltage

UC: rated auxiliary circuit voltage

IE: rated working current

I: instantaneous current value

ICW: rated short-time variable current

COSΦ: power factor

AC: Exchange

DC: DC

IP: enclosure protection level

PE: protective conductor

N: neutral conductorPEN：