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The shield is one of the most common components of heating cables and all types of cables, and is often woven into a network of wires to form a barrier
.
Generally speaking, when only one end of the shielding layer is connected with equipotential and the other end is suspended, it can only prevent static induction, and cannot prevent the voltage
induced by changes in magnetic field strength.
In order to reduce the induced voltage of the shielding core wire, in the case of equipotential connection at only one end of the shielding layer, a double-layer shield with insulation separation should be used, and the outer shield should be connected
at least equipotential at both ends.
In this case, the outer shield forms a loop with other equally potential connections, inducing a current, thereby generating a magnetic flux that reduces the strength of the source magnetic field, thereby essentially canceling out the voltage
induced without the outer shield.
The wire shielding layer plays an important role in the heating cable, mainly to shield the electromagnetism, so that the internal is not affected by external electromagnetic interference, and the internal electromagnetic energy does not easily run to the outside
.
It is used more in electrical equipment, and metal shielding
is required for all places or parts that need to resist electromagnetic interference.
In the heating cable, the role of the metal shield in the cable is mainly reflected in the following aspects:
First, strengthen the role of limiting the electric field in the insulation layer, so that the direction of the electric field is consistent with the direction of the insulation radius (that is, radial), and the metal shielding belt is grounded.
The electric field terminates on the metal strip, and there is no longer an electric field outside the metal band;
Second, prevent axial surface discharge
.
In the environment where the cable is not well grounded, due to the certain resistance coefficient of the semi-conductive layer, the potential distribution may be uneven in the axial direction of the cable, resulting in discharge along the surface of the cable;
Third, the power station protection system requires outer conductor shielding
.
Wrapped copper strip has excellent lightning protection characteristics;
Fourth, under normal conditions, the capacitor current flows, and the metal strip can be used as a loop
for the short-circuit fault current when short-circuited.
In addition, after the heating cable is processed by the shielding process, the final radiation amount is no different from the radiation amount of household appliances at home, such as lighting bulbs, and the so-called "heating cable radiation is large" is a misunderstanding
.
The shield is one of the most common components of heating cables and all types of cables, and is often woven into a network of wires to form a barrier
.
Generally speaking, when only one end of the shielding layer is connected with equipotential and the other end is suspended, it can only prevent static induction, and cannot prevent the voltage
induced by changes in magnetic field strength.
In order to reduce the induced voltage of the shielding core wire, in the case of equipotential connection at only one end of the shielding layer, a double-layer shield with insulation separation should be used, and the outer shield should be connected
at least equipotential at both ends.
In this case, the outer shield forms a loop with other equally potential connections, inducing a current, thereby generating a magnetic flux that reduces the strength of the source magnetic field, thereby essentially canceling out the voltage
induced without the outer shield.
The wire shielding layer plays an important role in the heating cable, mainly to shield the electromagnetism, so that the internal is not affected by external electromagnetic interference, and the internal electromagnetic energy does not easily run to the outside
.
It is used more in electrical equipment, and metal shielding
is required for all places or parts that need to resist electromagnetic interference.
In the heating cable, the role of the metal shield in the cable is mainly reflected in the following aspects:
First, strengthen the role of limiting the electric field in the insulation layer, so that the direction of the electric field is consistent with the direction of the insulation radius (that is, radial), and the metal shielding belt is grounded.
The electric field terminates on the metal strip, and there is no longer an electric field outside the metal band;
Second, prevent axial surface discharge
.
In the environment where the cable is not well grounded, due to the certain resistance coefficient of the semi-conductive layer, the potential distribution may be uneven in the axial direction of the cable, resulting in discharge along the surface of the cable;
Third, the power station protection system requires outer conductor shielding
.
Wrapped copper strip has excellent lightning protection characteristics;
Fourth, under normal conditions, the capacitor current flows, and the metal strip can be used as a loop
for the short-circuit fault current when short-circuited.
In addition, after the heating cable is processed by the shielding process, the final radiation amount is no different from the radiation amount of household appliances at home, such as lighting bulbs, and the so-called "heating cable radiation is large" is a misunderstanding
.
