PE电缆(国外英文资料).doc

PE电缆(国外英文资料) Ultra low frequency measurement of XLPE/PE cable Tan The Measurement of Tan of XLPE/PE Cables at Hz 8 Very 0.1 Low Frequency Harbin Electric Power Bureau (Harbin 150001): Sui Wenbo Sun Xianzeng Wang Zuojun Abstract Introduces the basic principle and measurement techniques of 0.1Hz ultra low frequency voltage test, which is a new method for field test of XLPE/PE cable. It can measure the cable Tan 8 overall defect sensitive test of cable insulation. The XLPE cable Tan field measurement results are given. Preface DC voltage test of XLPE/PE power cable will not easily produce space charge neutralization, not sensitive to detect insulation defects existing in the cable may also cause further damage to the good insulation. DC voltage test is not applicable to XLPE/PE cable has become conclusive; voltage test due to large capacity power supply and test equipment, field test is difficult to achieve. 0.1Hz ultra low frequency voltage test capacity is small, the theory is only the power frequency voltage of 1/500, so the equipment is light, portable, without space charge in XLPE/PE cable insulation, is currently the new XLPE/PE cable more effective test method. Pressure test is mainly used to detect insulation problem of local obvious flaws and serious global. In order to evaluate the insulation condition of XLPE/PE cable better, in addition to withstand test, but also for other non destructive test, Tan measurement is one of the major projects. Tan 8 1 0.1Hz frequency measurement technology 1.1 measuring principle The frequency of the voltage measurement using tan delta QS-1 bridge, using digital automatic balance bridge, the real and imaginary parts of separation, digital sampling waveform analysis method and zero crossing comparison of digital measurement technology. At the frequency of 0.1Hz, the bridge method is no longer applicable. The field test signal to high frequency interference, the real and imaginary separation method and zero crossing comparison