Frequently Asked Questions from TANO CABLE

1. For class Ⅰ signal cables must be shielded cables, class Ⅰ signal millivolt signal, the strain signal should be shielded twisted pair cable, but also to ensure that the shield is only a little ground, and to a good grounding. This can greatly reduce the electromagnetic interference and electrostatic interference.2. For Class Ⅱ signals should be shielded, Class Ⅱ signal for controlling, interlocking signal into the mold, open into the signal, it must be shielded cable, preferably shielded twisted-pair cable. Prohibiting the use of more than one core cable in the portion of the core wire for the transmission of class Ⅰ or Ⅱ class signal, the other part of the core lines for transmitting signals Ⅳ Ⅲ class or classes.3. For Ⅳ class signal is strictly prohibited and Ⅰ, Ⅱ class tied together signal traces should be treated as a 220V power line, class Ⅳ signal and power cables together with traces should be shielded twisted-pair cable. The absolute prohibition of high-power switch output signal lines, power lines, power lines, cable and Frequency Control System Ⅰ, Ⅱ class signal cables parallel bundle.
4. For Ⅲ class signal, allowing the 220V power line traces together (ie the same class Ⅳ signal), but also with Ⅰ, Ⅱ class together with the signal traces. But class Ⅲ signals must be shielded cable, preferably shielded twisted pair cable, and with Ⅰ, Ⅱ class signal cables more than 15cm apart. It prohibited the same signal several wires are distributed in different several cables (such as the three-wire RTD)
In the field cabling must be effectively separated from easy to produce interference cables Ⅲ, type Ⅳ signal cable, power lines, etc., so that it Ⅰ, Ⅱ class signal cables laid site is maintained at a safe distance (eg 15cm above). 
Signal and power cables should be different trunking alignment, when entering the inverter cabinet, should also be away from each other as possible. When these two cables can not be routed separately to meet the requirements, they must be shielded cable (shielded or twisted pair cable), and shall meet the following requirements:
 
1. If the spacing between the signal and power cables is less than 15cm, it must set the shielding metal separator between the signal and power cables, and grounding separator.
2. When the signal and power cables vertically or horizontally when installed separately, the spacing between the signal and power cables should be more than 15cm. For some disturbances particularly large applications, such as contact voltage is AC 220V power supply cable, the current in the inductive load 10A above, but when the power cable is not shielded, so it requires a direction perpendicular to the signal cable spacing must more than 60cm.
3. When two cables perpendicular, if the power cable is not shielded, in 1. 6mm in thickness is more than covered the iron cross section.
In order to reduce interference from analog converters and other equipment, should control the drive signal line and power circuits (main circuit and sequence circuit) traces separately. Distance should be more than 30cm. Even in the control cabinet, also have to maintain this connection specification. The signal cable is no longer than 50m, signal line protection metal pipe or a metal hose has to be extended to the control terminal of the inverter to ensure complete separation of signal lines and power lines. Analog control signal lines should use shielded twisted pair cable, wire gauge is 0.5 ~ 2mm2. When wiring cable stripping it as short as possible (5 ~ 7mm), while the subsequent stripping shield wrap with insulation tape to prevent contact with the shield and other equipment and the introduction of interference.

1. DC voltage cable insulation volume resistivity of the electric field distribution depends on the material, and the electric field distribution depends on the Ac voltage of each of the dielectric constant of the medium, especially in the DC cable terminal head, connector boxes and other cable accessories in alternating electric field intensity distribution and the distribution of the field strength is completely different, and the mechanism and the mechanism of aging DC voltage AC voltage insulation aging is not the same. Therefore the DC voltage test can not simulate high voltage cable operating conditions.

2. 10kV High tension power cable in the DC voltage will have a"memory"effect, unipolar accumulation of residual charge storage. Once you have the test because the DC voltage caused by "memory, that will take a long to release the DC bias If the DC cable before the release of residual charge is not fully operational, it will be superimposed on the DC bias power frequency voltage peak, the cable so that the voltage value far exceeds its rated voltage, which may cause the cable insulation breakdown.

3. DC voltage test, there will be injected into the polymer inside the electronic media, the formation of space charge, so reducing the electric field strength of the premises, making it difficult to breakdown occurs. Semiconductor contamination and projections at the point of high-voltage cables, etc. prone to space charge. However, if the cable terminal head occurs when the surface flashover test cable attachment or breakdown will cause the cable core line generated wave oscillation, has been the accumulation of space charge of the place, since the oscillation voltage polarity is rapidly changing different polarity, so that the at a field strength significantly increased, it may damage the insulation, resulting in more clicks to wear.

4. The 10kV high tension power cable fatal weakness is easy to produce water tree inside insulation, once the water branch. in the DC voltage will be rapidly converted the formation of discharge and accelerated the deterioration of insulation, so after running frequency voltage is formed converted into electrical trees, and the formation of discharge and accelerated the deterioration of insulation, so after running frequency voltage is formed under the action breakdown. And pure water trees in the AC operating voltage can remain fairly voltage value, and can be maintained for a period of time.

1. Observe the Roundness of the Insulating medium of RF Coaxial Cable
Standard RF Coaxial Cable cross-section is rounded, the cable outer shield, aluminum foil affixed to the outer surface of the insulating medium, the outer surface of the medium, the more rounded, the smaller the gap between the aluminum foil and its appearance, the more rounded the gap becomes. Practice has proved that the smaller the gap, the better the performance of cable. in addition, a large air gap easily penetrated the shield and affect the service life of the cable.

2. Check RF Coaxial Cable Insulation Medium Consistency
RE Coaxial cable insulation diameter fluctuations mainly affect media echo coefficients cable. this check can cross a section of cable insulation medium, double-check with a micrometer outer diameter of the points, to see whether it is consistent.
3. Detect the RF Coaxial Cable Braid
RF Coaxial Cable braid shielding performance of the coaxial cable plays an important role in the centralized power supply and cable television lines or power return line, so the coaxial cable quality testing must be flat braid is tight look, by coaxial outer sheath cut, cut short coaxial cable braid, braid on the identification number, if consistent with the given values of the indicators for qualified, less than the target value given for the failure. In addition to single braided cable measured with a micrometer screw, at the same price, the thicker the diameter, the better the quality.

4. Check the Quality of Aluminum Foil of RF Coaxial Cable
Shielded RF Coaxial Cable plays an important role in the aluminum foil, which has an important role in preventing open external signal interference with the cable signal leakage connection, coaxial cable and therefore new entrants should check the quality of the aluminum foil. First, cut open the sheathing layer, and observe weather the wire braid layer of aluminum foil to maintain a good surface gloss; second is to tale a length of cable , tightly wound in small metal shaft short cross-sectional drawing of aluminum foil and rub repeatedly in the hands, yet after repeated rubbing and stretching breakage, has a certain toughness
qualified otherwise defective.

5. Check the Outer Sheath of Extruded Tightness of RF Coaxial Cable
High-quality RF Coaxial Cable outer sheath are very tight package, which can narrow the gap between the inner shield to prevent air into the cause oxidation, preventing relative sliding shield layer causes the electrical properties of drift, but crowded pack too tight will cause inconvenience stripping head increase the difficulty of construction Check method is to take 1m long cable at the stripped end of the sheath, in order to force can not pull the thread core is suitable.

6. Observe the Cable into a Circle Shape
Cable knitting is not just a cosmetic problem, but also quality problems, Looped flat cable, each cable remains on the same concentric plane into between the cable and the cable between the cable and the cable parallel to the overall arc in contact with each other to reduce the cable by force, not easily deformed stacked injury, so the quality of cable and acceptance when this can not be taken lightly.

Protection material of high tension wire which greater than 11kV is XLPE insulation, and outer sheath such as plastic, rubber, steel wire armor(SWA), steel tape armor(STA), aluminum wire armor(AWA), aluminium tape armor(ATA), chain armor, aluminum wrinkles sheath etc.

You can get H07RN-F cable size by checking the printing word on cable or measuring the single wire of the conductor.

Flexible wires and cables are widely used in factory machinery mining machinery and mobile equipment and so on.