冲击电压在2台特高压直流平波电抗器之间的分布情况研究

Study on Distribution of Impulse Voltage Between Two UHVDC Smoothing Reactors

特高压±800kV、150mH直流平波电抗器由于电感、电流较大,需要制作成2台75mH的电抗器分别安装,串联起来运行。而对于相串联的2台干式空心平波电抗器,它们在雷电和操作波冲击下的暂态电压分布情况尚未被人们所关注。文章对相串联的2台干式空心平波电抗器,就其不带并联避雷器和带并联避雷器并联运行时,在雷电和操作波冲击下,第1台、第2台电抗器上的暂态电压分布情况分别进行了计算与模拟试验。认为,对作用于2台串联的平波电抗器的雷电冲击波,各自配备避雷器具有极好的强迫均压作用,使各电抗器电压不超过冲击电压的一半;对于2台串联运行并且各自配备避雷器的电抗器,不必串联起来进行冲击电压试验,应按避雷器的保护水平和绝缘配合系数单台进行试验。

The UHVDC smoothing reactor with ± 800 kV and 150 mH should be made of two 75 mH reactor to differentiate installation and series operation because of greater inductance and current. It is not concerned by people yet for the transient voltage distribution under lightning and switching impulse on the two dry types of air - core smoothing reactor with series connection. The paper introduced the calculation and simulation tests of transient voltage distribution under lightning and switching impulse on the first and second reactor with and without parallel arrester. The conclusion is that the lightning arrester has very good forced voltage sharing for the lightning impulse that is taken affect in the two smoothing reactors with series connection, which makes each reactor voltage not to exceed half of impact voltage. It is also pointed out that the two smoothing reactors with series connection and equipped with lightning arrester should not be carded out the impulse voltage test in series connection, and the test of single smoothing reactor is enough according to protection level of lightning arrester and insulation co - ordination coefficient.