| 摘要 |
<p>In conventional devices, a three-phase power circuit breaker is used as the residual-current switch for disconnecting the faulty pole and grounding. However, this has limitations because of the fact that no inductences to speak of or chokes be present in the ground line. Therefore in order to provide a simple and inexpensive method of taking an HVDCTS pole out of service without an expensive HVDC breaker, the station pole is grounded through a pole grounding switch which is spaced from the station center grounding electrode, and subsequently a partial fault current of other poles, occurring from the pole being taken out of service, is commutated into the station center groundîng electrode by the residual-current switch in the form of a circuit breaker. The method of taking a pole of high-voltage d-c transmission system (HVDCTS) out of service, includes a device having a rectifier station connected to a first three-phase network and an inverter station connected to a second three-phase network, two d-c lines connected from one station to the other, each station being divided into halves, the station halves of each station being connected together on one side to a station center grounding electrode, the other side of each station being connectible to the positive d-c line so as to form a positive pole, and to the negative d-c line so as to form a negative pole, and residual-current switching means for taking a pole out of service. The invention also includes closing a pole grounding switch and opening a residual-current switch in another station, after the pole grounding switch is closed and the residual current switch is opened in the station ot be taken out of service, and thereafter opening a disconnecting switch to switch off the d-c circuit associated with this pole.</p> |
