Electrical diagram definition

A diagram that represents the interrelationship and connection relationship between components in an electrical system or equipment with electrical graphical symbols, annotated enclosures or simplified shapes. Professional technical diagram showing the electrical relationship in the system and device.

Function of electrical diagram

It is an important tool and means to describe the working principle of electrical equipment and facilities, describe the composition and function of products, and provide assembly and use information.

Function documents: schematic diagram (system diagram, block diagram), function diagram, circuit diagram, table diagram, terminal function diagram and program diagram

Location documents: general layout, installation drawing, installation diagram, assembly drawing and layout drawing

Wiring documents: wiring diagram [table], cable diagram [table] [list]

Item list: component list, equipment list, spare component list

Instruction documents: installation instruction documents, commissioning instruction documents, operation instruction documents, reliability and maintainability instruction documents

Other documents: product standards, acceptance criteria, manuals, guidelines, samples, drawings and document lists, etc

(1) System diagram and block diagram

Definition: a diagram that roughly represents the basic composition, relationship and main characteristics of a system or subsystem with symbols or annotated boxes.

effect:

(1) as the basis for further preparation of detailed technical documents.

(2) for reference during operation and maintenance.

(3) for relevant departments to understand the overall scheme, brief working principle and main composition of the design object.

Common ground: they are represented by symbols or annotated boxes.

difference:

(1) system diagram is usually used to represent system or complete set of equipment, while block diagram is usually used to represent subsystem or equipment;

(2) if the system diagram is marked with project code, it is generally high-level code, and if the block diagram is marked with project code, it is generally category code.

(2) Circuit diagram

Definition: a diagram showing the connection relationship of all basic components of circuits, equipment or complete sets of devices in detail with graphical symbols and arranged in working order, regardless of their actual positions.

effect:

(1) express and understand the working principle of the design object in detail, analyze and calculate the circuit characteristics and parameters.

(2) provide information for testing and fault finding.

(3) provide basis for preparing wiring diagram.

(4) provide basis for installation and maintenance.

characteristic:

(1) equipment and components are represented by symbols, and technical parameters are appropriately marked.

(2) the working state of equipment and elements shall generally be indicated in the state or position of non excitation or non operation.

(3) the main circuit shall be drawn according to the flow direction of energy flow (i.e. current); The auxiliary circuit is drawn according to the action sequence, that is, the functional relationship.

(4) the main circuit is arranged vertically and the auxiliary circuit is arranged horizontally.

(3) Location plan and layout plan

Drawing showing the layout and installation position of each item in the complete set of equipment and equipment by orthographic projection method and graphical symbols.

(4) Wiring diagram and wiring list

A diagram or table showing the connection relationship of complete sets of devices, equipment and electrical components for installation, wiring, inspection, test and maintenance.

(5) Equipment component list

A table that lists the complete set of devices, equipment and components in the device and corresponding data. Its purpose is to indicate the name, model, specification and quantity of each component.