Time filter

Source Type

Li X.-H.,Guyuan Power Supply Bureau | Chen X.-X.,Guyuan Power Supply Bureau | Liu X.-Q.,Guyuan Power Supply Bureau
Gaoya Dianqi/High Voltage Apparatus | Year: 2011

This paper analyzed the structure, working movement, mechanical principle, and fault appearance of the SRCCT36-C spring mechanism, and concluded that the mal-operation of the spring mechanism is caused by mismatching of the moving parts in circuit breaker, conversion of switch-on/switch-off, and gap variation due to non-qualified materials, manufacturing technology and design, which make the energy-storing movement insufficient, and the circuit break refuse opening/closing.


Wei L.,Guyuan Power Supply Bureau | Peng J.-N.,Guyuan Power Supply Bureau | Zheng T.,North China Electrical Power University | Yang Z.,Guyuan Power Supply Bureau | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper introduces the phenomena that a biggish current will be induced on the non-fault wire when the 110 kV electric wires are in the single-phase grounding fault, which happened under the condition of transmission line icing or during the process of ice melting. Also, the relationship between the induced current and the climate condition of the place where the fault happened is discussed. Based on additional measured impedance, the zero-sequence mutual impedance data of the place where the fault happened is computed. And the influence of zero sequence mutual current on grounding distance and zero sequence current protection is analysed in a nutshell. For 110 kV line, the operation voltage is lower than EHV and UHV network, so it is not potency and common in mutual inductance coupled problem. Another way, we can avoid latent disadvantage impact of zero sequence mutual current from improving the relay protection equipment without observed reference impedance.


Wei L.,Guyuan Power Supply Bureau | Zheng T.,North China Electrical Power University | Peng J.-N.,Guyuan Power Supply Bureau | Qi P.-B.,Guyuan Power Supply Bureau | Yang Z.,Guyuan Power Supply Bureau
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper contains the three-phase current waveforms on the transformer high-voltage side when the transformer neutral-point spark gap is breakdown caused by single-phase earth fault of transmission line A, B or C. Based on the actual data, this paper analyses the character of three-phase current on the transformer high voltage side when the spark gap is breakdown, and the character of the fault current of load-side transformer whose neutral-point direct grounded when it's no-load. And on the above condition, the current size, the phase relation and the characteristic of waveforms have been opened out. Compared with the theoretical analysis, it concludes the immanent relation of the spark gap length and the waveforms. At last, it points out the effect to the relay protection caused by the spark gap breakdown and gives the method of how to avoid it.

Loading Guyuan Power Supply Bureau collaborators
Loading Guyuan Power Supply Bureau collaborators