THUNDER PROTECTION APPARATUS AND THUNDER PROTECTION METHOD
A lightning protection device for protecting a DC power supply device from a lightning surge current includes: a positive-electrode-side lightning arrester connected between a positive-electrode-side power cable of the DC power supply device and a ground point; and a negative-electrode-side lightning arrester connected between a negative-electrode-side power cable of the DC power supply device and the ground point, in which a difference in operating voltage between the positive-electrode-side lightning arrester and the negative-electrode-side lightning arrester is equal to or more than a reference value.
1 . A lightning protection device for protecting a DC power supply device from a lightning surge current, the lightning protection device comprising:
a positive-electrode-side lightning arrester connected between a positive-electrode-side power cable of the DC power supply device and a ground point; and
a negative-electrode-side lightning arrester connected between a negative-electrode-side power cable of the DC power supply device and the ground point, wherein
a difference in operating voltage between the positive-electrode-side lightning arrester and the negative-electrode-side lightning arrester is equal to or more than a reference value.
2 . The lightning protection device according to claim 1 , further comprising:
a voltage-to-ground securing arrester for securing a voltage between the ground and the positive-electrode-side and negative-electrode-side lightning arresters.
3 . The lightning protection device according to claim 1 , wherein
the negative-electrode-side lightning arrester includes a plurality of negative-electrode-side lightning arresters having different operating voltages; and
the lightning protection device further includes a plurality of negative electrode terminals connected to the respective plurality of negative-electrode-side lightning arresters.
4 . The lightning protection device according to claim 1 , wherein
the negative-electrode-side lightning arrester includes a plurality of negative-electrode-side lightning arresters having different operating voltages; and
the lightning protection device further includes a switch for each of the plurality of negative-electrode-side lightning arresters.
5 . A lightning protection method for protecting a DC power supply device from a lightning surge current, the lightning protection method comprising:
connecting a positive-electrode-side lightning arrester between a positive-electrode-side power cable of the DC power supply device and a ground point; and
connecting a negative-electrode-side lightning arrester between a negative-electrode-side power cable of the DC power supply device and the ground point, wherein
a difference in operating voltage between the positive-electrode-side lightning arrester and the negative-electrode-side lightning arrester is equal to or more than a reference value.
6 . The lightning protection method according to claim 5 , further comprising:
a voltage-to-ground securing arrester for securing a voltage between the ground and the positive-electrode-side and negative-electrode-side lightning arresters.
7 . The lightning protection method according to claim 5 , wherein
the negative-electrode-side lightning arrester includes a plurality of negative-electrode-side lightning arresters having different operating voltages; and
a plurality of negative electrode terminals is connected to the respective plurality of negative-electrode-side lightning arresters.
8 . The lightning protection method according to claim 5 , wherein
the negative-electrode-side lightning arrester includes a plurality of negative-electrode-side lightning arresters having different operating voltages; and
a switch for each of the plurality of negative-electrode-side lightning arresters.
9 . The lightning protection device according to claim 2 , wherein
the negative-electrode-side lightning arrester includes a plurality of negative-electrode-side lightning arresters having different operating voltages; and
the lightning protection device further includes a plurality of negative electrode terminals connected to the respective plurality of negative-electrode-side lightning arresters.
10 . The lightning protection device according to claim 2 , wherein
the negative-electrode-side lightning arrester includes a plurality of negative-electrode-side lightning arresters having different operating voltages; and
the lightning protection device further includes a switch for each of the plurality of negative-electrode-side lightning arresters.