Danging Single StranderApplication:
Suitable for control cable, communication cable, power cord, etc. PE or PVC coated core wire stranding and center belt or side belt End of sex.
With the extensive use of XLPE power cables, the online monitoring of power cable insulation has been rapidly developed for the safe operation and handling of XLPE power cables. Foreign countries began research on the shortcomings of XLPE cable insulation detection and aging monitoring as early as the 1960s. They are still intensively launched, especially in developed countries such as Europe, America and Et Ben.
The online operation monitoring system invested abroad provides a lot of monitoring results for the aging process of XLPE cable, which is rich in the criteria for cable shortcomings and aging; The deterioration trend of the system, combined with the inductive analysis of the monitoring results, the test carried out the evaluation of the residual life of the XL PE power cable body insulation and its accessories. As far as Japan's XL PE cable insulation shortcomings are concerned, the cable testing skills for 10kV and below are non-online and online. Non-online type includes: residual voltage, anti-absorption current, DC leakage current, potential attenuation method (DC); residual charge, DC voltage superposition method (DC and power frequency); communication loss current method (power frequency); dielectric loss method ( Ultra-low frequency. Online type includes: DC component, pulsation method (power frequency); DC voltage superposition method (DC and power frequency), etc. For higher voltage levels, there is no online type, only non-online type is used, and no longer With anti-absorption current, DC component, pulsation method, etc., such as DC bias, partial discharge, withstand voltage method, etc. Other parts of China also use partial discharge detection method for high-voltage XLPE cable and its accessories, such as the Netherlands, Switzerland, the United Kingdom At present, domestic low-voltage cables are selected according to GB9330--1988, and the step-by-step step-up method is adopted to control the cable for heat aging test and as a test basis and accounting method.
