The two-letter symbol consists of a single mother symbol indicating the category and another letter indicating the purpose, function, status and characteristics, with the category letter in front and the function name letter behind. If "T" stands for transformer, "TV" stands for voltage transformer and "TM" stands for power transformer.
The following are the representative meanings of the characters in the circuit diagram
Automatic switching-in device of AAT power supply
Alternating current
DC direct current
Rich fuse
G generator
M motor
Mercury green light
HR red light HW white light
Hp optical word board
K relay
KA(NZ) current relay (negative sequence zero sequence)
KD differential relay
KF flash relay
KH thermal relay
KM intermediate relay
KOF outlet intermediate relay
Knock sensor signal relay
KT time relay
KV(NZ) voltage relay (negative sequence zero sequence)
KP polarized relay
KR reed relay
KI impedance relay
KW(NZ) power direction relay (negative sequence zero sequence)
What does DZ2 16-63/3P-32A mean in electrical engineering drawings? In the electrical engineering drawing, DZ2 16 is the switch series and model, and Schneider series switches adopt DZ216; 63 This series of switches can pass the maximum current of 63 A. Generally, this type of switches is based on series connection, and DZ2 16-63 is used for the maximum switches of 63 and less, and the capacity is distinguished in the last argument. 3P This switch controls three 380 V voltages; 32A This switch can turn on and off the current 32A.
What does mwl mean in electrical engineering drawings? Mw should be capitalized, which is the unit of electric power, indicating MW, which is 1000 kW.
What does 1 # alsy-WL 1, P25, CC, WC mean in the electrical engineering drawing? The previous figures can only be seen in combination with drawings and projects. I guess it's architecture 1, and AL is usually the first letter of Chinese characters that sy knows. WL 1 is the first distribution line; P25 expression is unclear, which may be the diameter of PC tube 25 or PVC tube 25. CC is hidden along the top; WC hides along the wall. These are all engineering codes. You can look up "09DX00 1 Common graphic elements in building electrical engineering design".
WX and WLK on electrical engineering drawings represent socket loops?
WLK adopts modular single product structure, which integrates the main functions of traditional circuit breaker (fuse), contactor, overload (or overcurrent, phase failure) relay, starter, isolator and so on. WLK has the functions of remote automatic control and local direct manual control, panel indication and electromechanical signal alarm, and WLK has the characteristics of coordinated time-current protection (inverse time limit, fixed time limit and instantaneous three-stage protection).
What do you think of electrical engineering drawings? Understand the electrical system diagram first, and then combine with the direction of Tu Tu. Generally speaking, the general electrical engineering is divided into three parts, the power transformation and distribution part is generally in the power distribution room, then the pipeline part, including lighting and electricity, and the terminal part of the equipment is behind. I suggest you look at a set of electrical engineering drawings carefully and explore them carefully.
Graphical symbols for electrical engineering (1)
Explanation of shape symbol number of serial number diagram
1 switch (mechanical)
2. The general symbol of multistage switch is single line.
Multilevel switches are usually represented by symbols and multilines.
4 Contactor (contact is disconnected in inactive position)
5 Contactor (the contact is closed in the inactive position)
6 Load switch (load isolating switch)
7 Load switch with automatic release function
8 fuse circuit breaker
9 circuit breaker
10 disconnector
1 1 General symbol for fuse
12 drop fuse
13 fuse switch
14 fuse disconnector
15 load switch with fuse
Graphical symbols for electrical engineering (2)
Graphic symbol illustration
16 when the operating device is attracted, the moving contact is delayed to close.
17 when the operating device is released, the moving contact is delayed to close.
18 open circuit contact with delayed closing when the operating device is released.
19 when the operating device is attracted, it has a dynamic opening contact with delayed closing.
When the operating device is attracted, it delays closing and releasing, and it delays opening the movable contact.
2 1 button switch (unlocked)
22 knob switch, rotary switch (lock)
23 position switch, movable contact limit switch and movable contact
24 position switch, dynamic contact limit switch, dynamic contact
Note: θ can be replaced by working temperature.
26 thermal automatic switch, dynamic break contact Note: Pay attention to distinguish this contact from the contact of the thermal relay shown in the figure below.
27 gas discharge tube fluorescent lamp starter with thermal element
28 movable (normally open) contacts Note: This symbol can also be used as a general symbol for switches.
29 Dynamically open (normally closed) contacts
30 Make-before-break changeover contact
Graphical symbols for electrical engineering (3)
Interpretation of the number of symbols in number theory graphics
3 1 Instantaneous moving contact that is temporarily closed when the operating device is attracted or released.
32 (female) or one-pole sockets.
33 plug (male) or one-pole plug
34 plugs and sockets (male and female)
35 connection connector
36 Replace the lug
37 double winding transformer
38 three-winding transformer
39 autotransformer
40 Reactor Choke Diagram
4 1 current transformer pulse transformer
Current transformer with two cores and two secondary windings
A current transformer with two secondary windings on an iron core
44 Three-phase three-winding transformer with on-load tap changer, star delta connection and neutral point outgoing line.
45 Three-phase three-winding transformer, two windings are star-shaped with neutral point leading out and neutral point grounded, and the third winding is connected in an open triangle.
Graphical symbols for electrical engineering (4)
Explanation of shape symbol number of serial number diagram
Star Delta Connection of 46 Three-phase Transformer
47 star delta connection of three-phase transformer with on-load tap changer
Star zigzag connection of three-phase transformer 48
49 General symbols for operating devices
50 Combined representation of an operating device with two windings
5 1 thermal relay drive device
52 gas relay
53 automatic reclosing device
54 Common symbols for resistors
55 variable resistor adjustable resistor
56 sliding contact potentiometer
57 preset potentiometer
58 Common symbols for capacitors
59 variable capacitor adjustable capacitor
60 double homology variable capacitor
Graphical symbols for electrical engineering (6)
Explanation of shape symbol number of serial number diagram
6 1 indicator (asterisk must be indicated as required)
62 voltmeter
63 ampere meter
64 reactive ammeter
65 Maximum demand indicator (operated by integrating instrument)
66 reactive power meter
67 power factor table
68 frequency meter
Thermometer and pyrometer (θ can be replaced by T)
70 tachometer
7 1 totalizer and watt-hour meter (the asterisk must be replaced as necessary)
72 amp hour meter
73 watt-hour meter (watt-hour meter)
Reactive watt-hour meter
75 watt timepiece with transmitter
Telemetry instrument (transponder) operated by electric energy meter
Telemetry instrument (transponder) with printing equipment operated by watt-hour meter
78 Common symbols for screens, panels and racks Note: The name of the equipment can be indicated by symbol number or model number.
General symbols for 79 rows of racks
General symbols, such as manual switch board, interrupt switch board, measurement switch board and service switch board.
Graphical symbols for electrical engineering (7)
Explanation of shape symbol number of serial number diagram
1 1 1 control and signal lines (power supply and lighting)
1 12 primary battery or storage battery
1 13 original battery pack or battery pack
1 14 original battery pack or battery pack with faucet
1 15 universal grounding symbol
1 16 connect the chassis or bottom plate.
1 17 Noise-free grounding
1 18 protective grounding
1 19 equipotential
120 cable termination head
12 1 The power cable passes through the junction box.
122 power cable junction box power cable junction box
123 control and indication device
124 alarm starting device (point-manual or automatic)
125 linear detector
126 fire alarm device
127 heat
128 cigarettes
129 explosive gas
130 Manual startup
How to understand electrical engineering drawings, first learn electrical equipment codes and drawings?
Understand the meaning of electrical graphic symbols first. Generally speaking, drawings are made according to national standards. Find a standard and compare it with the drawings one by one. There are legends on general drawings, which can be understood when combined.