第2正相電流制限装置の動作特性と模擬送電系統への応用
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概要
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This paper describes an experimental study of application of negative-phase-sequence arc suppressor to power transmission system in the laboratory for the purpose of the suppression of fault currents. The device is a non-salient pole synchronous machine without amortisseur winding, having two-phase field windings connected with variable condensers. Testing machine is made as generator of this type, rated 50Hz, 220V, 3kVA and drived by a synchronous motor. The characteristic of the negative-phase-sequence impedance to inserted field capacitance is obtained from measurement of phase-to-phase dead short fault occured at armature terminals of the unloaded generator. The machine is applied to 200V power transmission system in the laboratory as generator or synchronous phase modifier and its neutral is directly grounded. A line-to-ground fault or a line-to-line short fault is occurred at the middle point of the transmission line in the system and measurement is made for thc steady-state quantities such as the current flowing into the fault branch, symmetrical components of the line currents, line-voltages and the voltages induced in the field windings. The results are shown from the measurements and numerical calculations as follows. 1) The negative-phase-sequence impedance of the machine is varied over the range 0.7 to 10 times the positive-phase-sequence impedance. 2) The operation of the system during the fault is changed according to the compensation of negative-phase-sequence network for the system. In particular, the current flowing into the fault can be reduced to 20% of that not compensated, when the series resonance is achieved by the device in the negative-phase-sequence network. 3) The voltage induced in the field winding of the device may be larger than the line-voltage before the faults.
- 山形大学の論文
- 1970-03-25