Compared with overhead lines, cable lines have the advantages of concealed laying, less climate interference, less maintenance, and less impact on the city’s city appearance, and their application in urban power grids is becoming more and more common. Among them, cross-linked polyethylene (XLPE) power cables have become mainstream cables because of their good electrical mechanical performance, large transmission capacity, and flexible construction and installation. Long-distance high-voltage XLPE cables have been widely used in urban construction.
\nIn order to ensure the safe operation of the line, the handover acceptance test must be carried out before the power cable is put into operation, so as to avoid the loss of operation failure caused by mechanical damage, installation process defects and other problems. The basic design of the AC resonance non-partial discharge test system provided by our company is the specific characteristics of the energy storage of the capacitive test object.<\/p>\n
AC series resonance PD free test system is mainly used in power industry, power transformer, HV PT, HV switchgear, ect. This system application conforms to XLPE cable power frequency voltage test and PD test requirement, and is suitable for PD test, voltage test and PD fault location test for XLPE cables before leaving factory. The test item includes AC voltage test, PD test,and cable long duration test.<\/p>\n
\u2022 Maximum altitude: \u2264 1000 m
\n\u2022 Altitude 100 m increase voltage rate lowered by 1%
\n\u2022 Ambient Temperature for HV component operation: 3 \uff5e 45\u2103
\n\u2022 HV component relative humidity (non-condensing): \u2264 95 %
\n\u2022 Temperature for electronic control and measuring:
\n+10 \uff5e +45\u2103
\n\u2022 Relative Humidity of electronic components: \u2264 80%
\n\u2022 Transport temprature: 20\u2103\uff5e + 60\u2103
\n\u2022 Anti-seismic: 8 grade
\n\u2022 Grounding resistance: \u2264 1.0\u03a9
\n\u2022 No dust<\/p>\n
\u2022 Rated voltage: 100kV \uff5e 1500kV (and above)
\n\u2022 Rated energy: 300kVA \uff5e 30000kVA (and above)
\n\u2022 Noise: \u2264 75dB (2 meters away from equipment)
\n\u2022 Q value: Q \u2265 20 \uff5e 100
\n\u2022 PD: 80% voltage PD \u2264 2pC
\n\u2022 Load: Under rated capacity, 1 hour on, 1 hour off,3 \uff5e 6 times per day; under 50% capacity,continuous operation. (customer can require longer operation)<\/p>\n
(1) Bigger reactor power (ineffective power) output with very low actual power input;
\n(2) After output filtered, output waveform distortion ratio is 0.5% lowered than total resonance wave distortion;
\n(3) When tested object fault happens, fault current generated in power loop will be deleted, and the fault point damage is the lowest;
\n(4) The operation mode is controllable resonance status, so accidental resonance will not happen, while this happens to traditional power
\nfrequency test transformer when doing capacitive load test.
\n(5) The complete application can significantly save costs.<\/p>\n