As we all know, electric heating cables are divided into constant power electric heating cables and self-limiting temperature electric heating cables, and constant power electric heating cables are further divided into series constant power electric heating cables and parallel constant power electric heating cables. People often confuse these types of electric heating cables, and it is not clear what the difference is between the three. Here, the difference between the series and parallel connection of the constant power electric heating cables and the self-limiting temperature electric heating cables is explained.
1. The difference between the series constant power electric heating cable and the parallel constant power electric heating cable
1. The constant power electric heating cable in series cannot be cut, and the constant power electric heating cable in parallel can be cut.
2. The heating elements of the two are different: the series electric heating cable adopts nickel-chromium alloy wire (the metal bus inside is heated), and the parallel electric heating cable adopts nickel-chromium winding wire for heating (that is, the winding wire wound on the outside, the metal busbar inside to conduct electricity).
3. The parallel constant power electric heating cable is suitable for large tanks and pipelines with high temperature requirements and explosion-proof areas, and the series electric heating cable is suitable for long-distance pipelines such as oil long-distance pipeline heating and large-scale tank insulation.
2. The difference between the self-limiting temperature electric heating cable and the constant power electric heating cable:
1. Working principle
Self-limiting temperature heating cable: After the power is turned on, the current is energized by one of the wires, and brought to the other wire through the PTC core to form a loop, and the core with resistance value heats up.
Constant power heating cable: When the insulated wire is energized, the current passes through the heating wire, and the heating wire generates heat and transfers heat.
2. Structural differences
Self-limiting temperature heating cable: PTC polymer conductive material is filled between the two wires.
Constant power heating cable: The copper-nickel heating wire is wound around the insulated wire and connected to the insulated wire at a distance.
3. Use environment
Self-limiting temperature tracing cable: used in places where the environment is not very complicated and the temperature requirements are not high.
Constant power heating cable: suitable for occasions where the user environment is more complicated and the temperature requirements are higher.
4. Use effect
Self-limiting temperature heating cable: It can adjust its own heating temperature according to the ambient temperature.
Constant power heating cable: the temperature remains unchanged, the calorific value and power are constant, and the stability performance is relatively strong.