a) The concept of wire and cable and the distinction between wires and cables:
Wire and cable refers to materials used for power, communications, and related transmission purposes. "Wire" and "cable" do not have strict boundaries. Generally, the product with a small number of cores, a small product diameter, and a simple structure is called a wire. A wire without insulation is called a bare wire. Others are called cables. A conductor with a larger cross-sectional area (greater than 6 mm2) is called a large wire. Small (less than or equal to 6 square millimeters) is called a small wire, and an insulated wire is also called a cloth wire.
Wire and cable include bare wires, electromagnetic wires and insulated wires for electrical appliances, power cables, communication cables and optical cables. Wire and cable named:
The complete naming of wires and cables is usually complicated, so people sometimes use a simple name (usually a category name) in combination with the model specification instead of the full name, such as "low voltage cable" representing all plastic insulated power of 0.6/1kV class cable. The spectrum of wires and cables is relatively complete. It can be said that as long as the standard model specifications of wire and cable are written, specific products can be specified, but what is its full name?
The following principles apply to the naming of wire and cable products:
1. Contents included in the product name (1) Product application or size category name (2) Product structure material or type;
(3) Significant or additional features of the product are basically named in the above order, sometimes to emphasize important or additional features, to write features to the front or to the corresponding structure description.
2, the structure of the description of the order Product structure description from the inside to the outside principle: conductor -> insulation -> inner sheath -> outer sheath -> armored type.
3, Simplified In the case of no confusion, some structures describe writing or abbreviations. For example, aluminum conductors are not allowed in automobile lines and cords, so conductor materials are not described.
Examples:
Rated voltage 8.7/15kV flame-retardant copper core XLPE insulated steel tape armored PVC sheathed power cable "rated voltage 8.7/15kV" - use occasion / voltage rating "flame-retardant" - emphasized characteristics "copper Core" - Conductor Material "Crosslinked Polyethylene Insulation" - Insulating Material "Steel Tape Armored" - Armored Layer Material and Type (Double Steel Band Gaps)
"PVC sheath" - inner and outer sheath material (the same inside and outside sheath material, save the inner sheath material)
"Power cable" - the product category name corresponding to the corresponding model is written as ZR-YJV22-8.7/15, the model is written in the following instructions. Model: The model composition and sequence of wire and cable are as follows: [1: category, use] [2: conductor] [3: insulation] [4: inner sheath] [5: structural features] [6: outer sheath or derivative] -[7:Usage Characteristics] Items 1-5 and 7 are indicated by pinyin letters. Polymer materials are represented by the English alphabet. Each item can be 1-2 letters; item 6 is 1-3. digital. The omitted principle in the model: Copper is the main conductor material used in wire and cable products, so the copper core code is written by T, except for bare wires and bare conductor products. Bare wire and bare conductor products, power cable products, and magnet wire products do not indicate major codes. Wire and cable and cable for electrical equipment and communication cables are also not listed, but subcategories or serial numbers are listed. The seventh item is a mark for various special use occasions or additional special use requirements, and is marked with pinyin letters after the "-". Sometimes, to highlight this item, write this item to the front. Such as ZR-(flame-retardant), NH-(refractory), WDZ-(low-smoke and halogen-free, corporate standards), -TH (for hot and humid areas), FY-(anti-termite, corporate standards) and so on. Digital Marking Coating Outer Layer or Outer Sheath
1 interlocking armored fiber outer layer 2 double steel tape PVC jacket 3 fine round wire polyethylene jacket 4 thick round wire 5 corrugated (embossed) steel strip 6 double aluminum (or aluminum alloy) strip 8 copper wire weaving 9 Wire Braid 5. What is the cable intermediate connector?
Answer: The device that connects the cable with the cable conductor, insulation shield and protective layer to connect the cable line is called the cable middle connector.
6, what is the main electrical wiring?
Answer: The main electrical connection is the connection mode of the main electrical equipment and busbars in power plants and substations, including the main busbars and plant power systems according to certain functional requirements.
7. What rules should be followed when selecting the section of a power cable?
A: The selection of power cables should follow the following principles:
(1) The rated voltage of the cable shall be greater than or equal to the rated voltage of the power supply system at the installation point;
(2) The continuous allowable current of the cable shall be equal to or greater than the maximum continuous current of the supply load;
(3) The cross-section of the core must meet the requirements for the stability of the short circuit of the power supply system;
(4) Verify that the voltage drop meets the requirements based on the length of the cable;
(5) The minimum short-circuit current at the end of the line should enable the protection device to operate reliably.
8. What are the advantages of cross-linked polyethylene cable and oil-paper cable?
A: (1) Easy to install because it allows a small minimum bending radius and light weight;
(2) Not subject to line drop restrictions;
(3) Good thermal performance, allowing high working temperature and large transmission capacity;
(4) The cable accessories are simple and all have a dry structure;
(5) Simple operation and maintenance, no oil leakage problem;
(6) Lower prices;
(7) High reliability and low failure rate;
(8) There are few manufacturing processes, simple processes, and significant economic benefits.
Wire and cable refers to materials used for power, communications, and related transmission purposes. "Wire" and "cable" do not have strict boundaries. Generally, the product with a small number of cores, a small product diameter, and a simple structure is called a wire. A wire without insulation is called a bare wire. Others are called cables. A conductor with a larger cross-sectional area (greater than 6 mm2) is called a large wire. Small (less than or equal to 6 square millimeters) is called a small wire, and an insulated wire is also called a cloth wire.
Wire and cable include bare wires, electromagnetic wires and insulated wires for electrical appliances, power cables, communication cables and optical cables. Wire and cable named:
The complete naming of wires and cables is usually complicated, so people sometimes use a simple name (usually a category name) in combination with the model specification instead of the full name, such as "low voltage cable" representing all plastic insulated power of 0.6/1kV class cable. The spectrum of wires and cables is relatively complete. It can be said that as long as the standard model specifications of wire and cable are written, specific products can be specified, but what is its full name?
The following principles apply to the naming of wire and cable products:
1. Contents included in the product name (1) Product application or size category name (2) Product structure material or type;
(3) Significant or additional features of the product are basically named in the above order, sometimes to emphasize important or additional features, to write features to the front or to the corresponding structure description.
2, the structure of the description of the order Product structure description from the inside to the outside principle: conductor -> insulation -> inner sheath -> outer sheath -> armored type.
3, Simplified In the case of no confusion, some structures describe writing or abbreviations. For example, aluminum conductors are not allowed in automobile lines and cords, so conductor materials are not described.
Examples:
Rated voltage 8.7/15kV flame-retardant copper core XLPE insulated steel tape armored PVC sheathed power cable "rated voltage 8.7/15kV" - use occasion / voltage rating "flame-retardant" - emphasized characteristics "copper Core" - Conductor Material "Crosslinked Polyethylene Insulation" - Insulating Material "Steel Tape Armored" - Armored Layer Material and Type (Double Steel Band Gaps)
"PVC sheath" - inner and outer sheath material (the same inside and outside sheath material, save the inner sheath material)
"Power cable" - the product category name corresponding to the corresponding model is written as ZR-YJV22-8.7/15, the model is written in the following instructions. Model: The model composition and sequence of wire and cable are as follows: [1: category, use] [2: conductor] [3: insulation] [4: inner sheath] [5: structural features] [6: outer sheath or derivative] -[7:Usage Characteristics] Items 1-5 and 7 are indicated by pinyin letters. Polymer materials are represented by the English alphabet. Each item can be 1-2 letters; item 6 is 1-3. digital. The omitted principle in the model: Copper is the main conductor material used in wire and cable products, so the copper core code is written by T, except for bare wires and bare conductor products. Bare wire and bare conductor products, power cable products, and magnet wire products do not indicate major codes. Wire and cable and cable for electrical equipment and communication cables are also not listed, but subcategories or serial numbers are listed. The seventh item is a mark for various special use occasions or additional special use requirements, and is marked with pinyin letters after the "-". Sometimes, to highlight this item, write this item to the front. Such as ZR-(flame-retardant), NH-(refractory), WDZ-(low-smoke and halogen-free, corporate standards), -TH (for hot and humid areas), FY-(anti-termite, corporate standards) and so on. Digital Marking Coating Outer Layer or Outer Sheath
1 interlocking armored fiber outer layer 2 double steel tape PVC jacket 3 fine round wire polyethylene jacket 4 thick round wire 5 corrugated (embossed) steel strip 6 double aluminum (or aluminum alloy) strip 8 copper wire weaving 9 Wire Braid 5. What is the cable intermediate connector?
Answer: The device that connects the cable with the cable conductor, insulation shield and protective layer to connect the cable line is called the cable middle connector.
6, what is the main electrical wiring?
Answer: The main electrical connection is the connection mode of the main electrical equipment and busbars in power plants and substations, including the main busbars and plant power systems according to certain functional requirements.
7. What rules should be followed when selecting the section of a power cable?
A: The selection of power cables should follow the following principles:
(1) The rated voltage of the cable shall be greater than or equal to the rated voltage of the power supply system at the installation point;
(2) The continuous allowable current of the cable shall be equal to or greater than the maximum continuous current of the supply load;
(3) The cross-section of the core must meet the requirements for the stability of the short circuit of the power supply system;
(4) Verify that the voltage drop meets the requirements based on the length of the cable;
(5) The minimum short-circuit current at the end of the line should enable the protection device to operate reliably.
8. What are the advantages of cross-linked polyethylene cable and oil-paper cable?
A: (1) Easy to install because it allows a small minimum bending radius and light weight;
(2) Not subject to line drop restrictions;
(3) Good thermal performance, allowing high working temperature and large transmission capacity;
(4) The cable accessories are simple and all have a dry structure;
(5) Simple operation and maintenance, no oil leakage problem;
(6) Lower prices;
(7) High reliability and low failure rate;
(8) There are few manufacturing processes, simple processes, and significant economic benefits.
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