Wuhu Heng Xin Cable Co., Ltd.
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Wuhu Heng Xin Cable Co., Ltd.

Daili Cloud: 13955309088
Email: sales@ahhengxincable.com
13955309088@163.com
Sales Hotline: 0553-3837700, 3832212
Address: Anhui Province Wuhu Nine North
China Road electrical Components Industrial
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1 overview

Temperature-controlled heating cable (cable) is also known as the self-regulation of the electric partner hotline or the self-limiting temperature of the tropics. It is an electric power with the temperature of the system with the self-regulating band temperature-limited heating device. That is, the cable itself has automatic temperature limit, and with the heating system temperature changes can automatically adjust the function of heating power to ensure that the working system is always stable in the set of the best operating temperature zone normal operation.

1.1 Working features

-can automatically limit the operating temperature of the cable when heating;

-can adjust the output power automatically with the temperature change of the heating system without additional equipment;

-cable can be arbitrarily cut short or within a certain range of use, and the performance of the same.

-Allow cross overlapping winding without worry of overheating or burning.

1.2 Advantages of work

Temperature-controlled heating cable for antifreeze and insulation, has the following advantages:

-The heating line temperature uniformity, will not overheat, safe and reliable;

-Save energy;

-During intermittent operation, the heating starts fast;

-Low installation and operation costs;

-Easy to install and maintain;

-Easy to automate management

-No environmental pollution.

2 Principle of PTC operation

2.1 PTC Effect and PTC Material

The PTC effect, the positive temperature coefficient effect, is the characteristic that the material resistivity increases with the increase of temperature, and the resistivity increases rapidly in a certain temperature range. The material with PTC effect is called PTC material, and the polymer PTC material of this cable is a blend of semi crystalline polymer and carbon black.

2.2 Working principle

The heating element of temperature-controlled heating cable is a core band made of PTC material, which is evenly packed between two parallel metal buses. After the PTC material is melted and extruded and cooled, it disperses the carbon particles to form numerous thin conductive carbon networks. When they are connected to two parallel bus, the PTC parallel circuit of the core belt is formed. When the two busbar on one end of the cable is connected with the power supply, the current flows horizontally through the PTC material layer to the other bus to form a parallel circuit. PTC layer is a continuous parallel in the busbar between the resistance heating body, the electrical energy into heat, the operating system with thermal insulation. When the core belt temperature rises to the corresponding high resistance zone, the resistance is large to almost block the current degree, the core band temperature will reach High-limit no longer rise (that is, automatic temperature limit). At the same time, the core belt through the sheath to the temperature of the lower heating system heat transfer, to achieve the steady state of the amount of heat transfer Unit is equal to the electrical power of the cable. The output power of the cable is mainly controlled by the heat transfer process and the temperature of the heating system.

2.3 Cable Working performance

2.3.1 Power self-tuning performance

The heating power of the hot cable is automatically reduced with the increase of temperature, or automatically increases with the decrease of temperature.

2.3.2 self-limiting temperature performance

When the heating cable is energized, the temperature rises, the resistance increases, when the resistance reaches a maximum, the electric power tends to be very small, and the temperature rises to the high-limit, which is the self limiting temperature characteristic of the cable. Temperature limit heating refers to the process that the cable can high-limit in a certain temperature area below the temperature.

2.3.3 PTC Memory Performance

The resistance of the heating cable increases with the increase of temperature, and if the resistance can return to the original starting point along the original heating line, it has the PTC memory performance. A cable with memory capability can be reused for a long time.

2.3.4 Temperature Uniformity performance

The core band of temperature control heating cable is composed of a large number of PTC parallel units formed by the thin conductive network. When the heat and energy consumption fluctuation occurs in any section of the heating pipeline, each PTC element in its location can directly feel temperature and respond independently. Immediately to eliminate fluctuations in the direction of automatic adjustment of their output power, the temperature of the power to increase the high temperature of the power is reduced, and the amplitude of temperature fluctuations, given the size of the power amplitude modulation, in order to maintain the entire system of the operating temperature uniformity and stability. This is a micro-region tracking, full line synchronous, fully automatic thermal insulation process.

3 Key parameter definitions

3.1 Nominal power

Nominal power refers to the steady-state electric power of the output of a temperature-controlled heating cable per meter at rated operating voltage and in a certain insulating layer with cable heating pipe temperature of 10 ℃.

3.2 Temperature Index

The temperature index refers to the value of the output power of the cable (generally given the lowest value) when the output power of the cable drops, or when the temperature is lowered by 1 ℃ per 1 ℃.

3.3 Maximum Maintenance temperature

When a certain type of cable with a certain system, can make the system to maintain the highest temperature known as the type of cable maximum maintenance temperature. The maintenance temperature is a relative parameter, which is related to the heat loss size of the thermal insulation system and the maximum surface temperature of the heating cable. In use, if properly designed, the system temperature can be maintained from the highest temperature to the ambient temperature of any temperature.

3.4 Maximum exposure temperature

Exposure temperature is the temperature that the external heat source exerts on the cable. Exposure temperature above a certain temperature, will begin to damage the electrical properties of the cable. This temperature is the highest temperature that can be sustained by a temperature-controlled heating cable, known as the maximum exposure temperature.

3.5 Maximum surface temperature

Refers to the maximum heating temperature that can be achieved on the surface of the hot cable which is working under the rated voltage under good heat insulation conditions. This parameter is important for situations where flammable materials and explosive atmospheres are available.

3.6 Maximum Use length

At the rated operating voltage of a single power supply, the heating cable has the maximum allowable length limit, which is the maximum length used. Maximum use length is related to rated voltage, power, specification and ambient temperature. If you need to exceed the maximum length of use, you should connect to the power supply separately.

4 model and Structure

4.1 Product model Specification method

The product model and specification method are as follows:

Structure type

Rated voltage

Product Code

Temperature level

Nominal power

Left-to-right

1 Nominal power: For example, "10" means nominal power is 10wm-1.

2 temperature Grade: D indicates low temperature;

3 Product Code: WK Indicates the temperature-controlled cable.

4 Rated Voltage: "1" means 110V; "2" means 220V; "3" means 380V.

5 Structure Type: "J" means basic type, "P" means shielding type, "F" indicates protection type.

Example: 10dwk2-f

said: The protection of low-temperature temperature control heating cable (as shown in Fig. 1), nominal power 10wm-1, rated voltage 220V.

4.2 Model Specifications

product model specification See table 1

Table 1 product model specification (220V)

Project basic type Shielding type protection nominal power w/m

Low Temperature Series Dwk-j Dwk-p Dwk-f 10, 25, 35, 45

Medium Temperature Series Zwk-j Zwk-p Zwk-f 30, 40, 50, 60

4.3 Product structure

(1) conductor (tinned copper wire 1.0, 1.5, 2.5mm2)

(2) PTC Core Belt

(3) Modified Polyolefin insulating layer

(4) Tinned copper wire woven shielding layer

(5) Modified polyolefin or fluorocarbon resin sheath layer

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