What is an electrical cabinet heater, what should be paid attention to in PTC heaters, and the principle of cabinet heaters

What is an electrical cabinet heater

In modern power or communication engineering, cabinet electrical cabinets are widely used. The electrical control cabinet is a common line centralized control unit. The inside of the cabinet is often densely covered with precision power or communication components. There are components with relatively strict temperature requirements. During operation, electrical cabinets are exposed to the risk of condensed water inside at any time. In the normal operating environment of electrical cabinets, their own heat can effectively prevent the formation of condensed water. However, once it stops working, the temperature of the components in the cabinet will slowly drop, which may form condensed water. The function of the electric heater and the cabinet dehumidification heater is to remove the moisture inside the cabinet and keep the inside dry. Prevents the temperature from dropping below zero or to a low set point.

The general cabinet heating and dehumidification method is that the heating wire is densely distributed on the inner wall of the cabinet, and the cabinet is heated by heating the heating wire. This method is less safe, and it is difficult to dissipate heat once the heating is excessive.

Here, Linkwell recommends the use of PTC cabinet heaters

It consists of galvanized outer pressure plate, stainless steel corrugated spring sheet, galvanized inner pressure plate, single-layer aluminum heat sink, ptc heating plate, double-layer aluminum heat sink, nickel-plated copper electrode terminal and pps high temperature plastic electrode sheath. PTC heaters produced with patented technology are divided into cable type and terminal type. They are composed of PTC heating components and corrugated aluminum strips through high temperature glue. PTC heater has the advantages of small thermal resistance and high heat exchange efficiency. It is an automatic constant temperature and power saving electric heater. One of its outstanding features is its safety performance. In any application, it will not produce redness on the surface of electric heating tube heaters, which may cause scalding, fire and other safety hazards. Improve its heat dissipation efficiency.

The working principle of PTC heater for electrical cabinet:

When the ptc heater is working, the low-temperature fluid medium enters its input port through the pipeline under the action of pressure, along the specific heat exchange flow channel inside the electric heating container, and uses the path designed by the principle of fluid thermodynamics to take away the high temperature generated by the electric heating element. The heat energy increases the temperature of the heated medium, and the outlet of the electric heater obtains the high temperature medium required by the process. The internal control system of the electric heater automatically adjusts the output power of the electric heater according to the temperature sensor signal at the output port, so that the temperature of the medium at the output port is uniform; when the heating element is overheated, the independent overheating protection device of the heating element immediately cuts off the heating power to avoid The overheating of the heated material causes coking, deterioration and carbonization.

The PTC cabinet heater also has a feature of automatic constant temperature, and at the same time, the self-heating temperature also has a good value, which is very effective in preventing damage to itself and other components due to excessive heating in electrical equipment.

So what should you pay attention to when using cabinet heaters?

● Different heat dissipation conditions make the heating power of PTC heaters vary greatly

● When multiple PTC heaters are used together, they should be connected in parallel, not in series.

● The surface temperature of the PTC heating element is controlled by the PTC itself, or it can be controlled by disconnecting the circuit, but the surface temperature cannot be controlled by adjusting the voltage.

● PTC itself is highly reliable and has a long lifespan, but if it is improperly assembled, the product will have unstable power and temperature.

● The heater is used in applications where the electrical cabinet needs to be protected from moisture, or where the temperature cannot be lower than the minimum value.