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4.2.1 Vertically installed three-phase reactors shall include vertically installed three-phase cement reactors and vertically installed three-phase dry hollow core reactors.
4.2.2 Aseismatic appraisal for vertically installed three-phase reactors shall focus on the examination of the reactor models and installation methods.
4.2.3 Aseismatic calculations shall be made for the vertically installed three-phase cement reactors used in the areas where the aseismatic precautionary intensity is 7 degree and above and the vertically installed three-phase dry hollow core reactors used in the areas where the aseismatic precautionary intensity is 8 degree and above in accordance with Chapter 5 of this standard.
4.2.4 The aseismatic appraisal for vertically installed three-phase reactors shall meet the following requirements:
1 Vertically installed three-phase reactors should be dry hollow core reactors.
2 Three-phase reactors should be horizontally installed.
4.2.5 If the vertically installed three-phase reactors fail to meet the aseismatic appraisal requirements in this section，aseismatic measures shall be taken in accordance with the following provisions:
1 In the areas where the aseismatic precautionary intensity is 6 degree or 7 degree，the vertically installed three-phase cement reactors should be changed to dry hollow core reactors，and in the areas where the aseismatic precautionary intensity is in 8 degree or 9 degree，the vertically installed threephase cement reactors shall be changed to dry hollow core reactors.
2 Vertically installed three-phase reactors should be changed to horizontally installed reactors where site conditions permit.
4.2.6 For the vertically installed three-phase dry air-core reactors used in the areas where the aseismatic precautionary intensity is 8 degree and above and the vertically installed three-phase cement reactors，if their aseismatic calculation fail to meet the aseismatic appraisal requirements，seismic strengthening may be made in accordance with Appendix B of this standard.
4.2.7 For the supporting porcelain insulators of the vertically installed three-phase dry air-core reactors in the areas where the aseismatic precautionary intensity is 7 degree and below or for the supporting porcelain insulators of the horizontally installed three-phase cement reactors，if their aseismatic calculation fail to meet the aseismatic appraisal requirements，such supporting porcelain insulators shall be replaced with the insulators in higher strength.