Uvod u klasifikaciju električnog grijanja
Electric heating cables on the market can be subdivided into self-controlling electric heating cables and constant power electric heating cables.
The self-controlling electric heating cable automatically reduces the heat (resistance increases), and when the temperature decreases, the tropical belt releases more heat (resistance decreases). This automatic temperature control performance can compensate for temperature changes at any time, avoid overheating and burning of the electric heating cable, and control the temperature of the heated body more strictly.
The electric heating cable can be wound and knotted at will without worrying about overheating. In this case, the general electric heating cable will be overheated and burned at the staggered point of the tropical belt, which is more energy-saving than steam heating and has no leakage.
Automatic temperature control electric heat tracing without temperature control equipment, automatic operation. Safe and explosion-proof, economical and energy-saving, it is widely used in the heat tracing, heat preservation, anti-coagulation and anti-freezing of pipelines and storage tanks in industrial enterprises such as petroleum, chemical industry, steel and electric power. This cable is suitable for electric heat tracing of pipelines in common area, hazardous area and corrosion area.
The so-called constant power type electric heating cable type has a constant power after it is energized, and it will not change with the change of the external environment, thermal insulation material, and heat tracing material. Usually, it changes when the temperature sensor is placed at a certain point. The constant power type electric heating cable is two (220V) or three parallel insulated copper core wires as the busbar, and the heating wire is wound on the insulating surface, and the heating wire is connected to the busbar at a certain distance (ie the number of heating sections). Cross in parallel to form a continuous parallel resistance. The electric heating cable provided by Xidian can be cut arbitrarily, and it is not allowed to overlap, cross or be sandwiched in the middle of the thermal insulation layer material, so as to avoid the
Grejni pojas je pregrejan i oštećen.
The calorific value per unit length of the constant power parallel electric heating cable is constant, and the longer the electric heating cable used, the greater the total output power. The electric heating cable can be cut arbitrarily according to the actual length in the field. In addition, due to its softness, the electric heating tape can be easily attached to the surface of the pipe. The metal shielding net on the outer layer of the electric heating tape can prevent static electricity and be grounded safely. It not only improves the overall strength of the electric heating tape, but also plays a role in transmitting The role of heat and heat dissipation.