Longitudinal impedance-based T-shaped line protection and calculation method
A technology of longitudinal impedance and calculation method, which is applied in the direction of detecting faults, instruments, and measuring devices according to conductor types, and can solve the problems of transient saturation effects of current transformers and difficulties in setting current differential protection, so as to overcome misoperation and eliminate Phase-to-phase coupling, high reliability effects
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[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0016] The present invention is based on the T-shaped line protection calculation method of longitudinal impedance, specifically implements according to the following steps:
[0017] Step 1: Calculation of the longitudinal impedance when faults occur inside and outside the single-phase line of the T-type line.
[0018] Such as figure 1 As shown, m, n and p are the three-terminal electrical measurement terminals of the protected transmission line; Z m ,Z n ,Z p are the system impedance of the three terminals of the line; z is the positive sequence impedance of the line per unit length; d is the measurement distance from the m terminal to the fault point when there is an internal fault, D 1 is the distance from m terminal to T interface, D 2 is the distance from n-terminal to T-interface, D 3 is the distance from the p terminal to the T i...
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