This standard specifies the grounding requirements and methods for the electrical installations for power generation, transformation, transmission and distribution for who nominal AC voltage are lower than 500kV (hereinafter referred to as "A-category electrical installations") and the building electrical installations (hereinafter referred to as "B-category electrical installations").
1. Scope 2. Terms and Definitions 3. General provisions for grounding of A-category electrical installations 4. Scope of protective ground of A-category electrical installations 5. Ground resistance of A-category electrical installations 5.1 Ground resistance of the electrical installation in the power plant and transformer station 5.2 The ground resistance of the overhead network 5.3 The ground resistance of the electrical installation for power distribution 6. Grounding connection of the A-category electrical installations 6.1 General provisions of grounding connection 6.2 Grounding connection of the electrical installation in the power plant and transformer station 6.3 Grounding connection of poles and towers of overhead network 6.4 Electrical installation of power distribution installations 7 The grounding type of low-voltage system and the ground resistance of B-category electrical installations 7.1 System grounding type 7.2 Ground resistance and equipotential connection of the grounding connection, 8 Grounding connection and protective conductor of B-category electrical installations 8.1 General requirements 8.2 Grounding connection 8.3 Protective conductor 8.4 Grounding connection 8.5 Equipotential coupling cable Annex A (Normative Annex) Annex B (Normative Annex) Annex C (Normative Annex) Annex D (Normative Annex) Annex E (Normative Annex) Annex F (Informative Annex)
This standard specifies the grounding requirements and methods for the electrical installations for power generation, transformation, transmission and distribution for who nominal AC voltage are lower than 500kV (hereinafter referred to as "A-category electrical installations") and the building electrical installations (hereinafter referred to as "B-category electrical installations").
Contents of DL/T 621-1997
1. Scope
2. Terms and Definitions
3. General provisions for grounding of A-category electrical installations
4. Scope of protective ground of A-category electrical installations
5. Ground resistance of A-category electrical installations
5.1 Ground resistance of the electrical installation in the power plant and transformer station
5.2 The ground resistance of the overhead network
5.3 The ground resistance of the electrical installation for power distribution
6. Grounding connection of the A-category electrical installations
6.1 General provisions of grounding connection
6.2 Grounding connection of the electrical installation in the power plant and transformer station
6.3 Grounding connection of poles and towers of overhead network
6.4 Electrical installation of power distribution installations
7 The grounding type of low-voltage system and the ground resistance of B-category electrical installations
7.1 System grounding type
7.2 Ground resistance and equipotential connection of the grounding connection,
8 Grounding connection and protective conductor of B-category electrical installations
8.1 General requirements
8.2 Grounding connection
8.3 Protective conductor
8.4 Grounding connection
8.5 Equipotential coupling cable
Annex A (Normative Annex)
Annex B (Normative Annex)
Annex C (Normative Annex)
Annex D (Normative Annex)
Annex E (Normative Annex)
Annex F (Informative Annex)
