Abstract
We propose a method to identify permanent faults for the transmission lines with shunt reactors. The method uses π type equivalent model (including the transition resistor branch) of single-phase fault that is switched off as the proto type, and distinguishes permanent fault from transient fault by calculating the value of transition resistor. Furthermore, it is supposed that the result of fault location is known. In the case of permanent fault, the calculated value of transition resistor is very low, but for the transient fault, the value of transition resistor is very high. An alternative transients program (ATP) simulation software is used to make simulation models of transmission lines to emulate transmission line faults in all situations. Then the simulation results are processed through editing MATLAB (matrix laboratory) program, which uses least-square method to calculate the value of transition resistor and then draws figures of the results. Through analyzing the figures, we can distinguish permanent fault from transient fault. Compared with traditional criterions, this method is not influenced by non-periodic components and transition condition harmonics, etc. Moreover, the severity of the permanent fault can be reflected through calculating the value of transition resistance and the extinction time of secondary arc can be assessed. ATP simulation results show that the proposed method can effectively distinguish permanent fault from transient fault. This method can be applied to the single-phase adaptive reclosure in transmission lines with shunt reactors.
| Original language | English |
|---|---|
| Pages (from-to) | 1944-1951 |
| Number of pages | 8 |
| Journal | Gaodianya Jishu/High Voltage Engineering |
| Volume | 37 |
| Issue number | 8 |
| State | Published - Aug 2011 |
Keywords
- π type equivalent model
- Parameter identification
- Permanent fault
- Reclosing time
- Single-phase reclosure
- Transition resistance
- Transmission lines