var videoObject = {container:'.video', variable:'player', autoplay: true, html5m3u8: true, video: "https://vdse.bdstatic.com//8210235f9776848579c0ff69dca5f052?authorization=bce-auth-v1%2F40f207e648424f47b2e3dfbb1014b %2F2017-05-11T09%3A02%3A31Z%2F-1%2F%2F710acdab125b25ab7916dc0cc26f0ab27627b052e606ebe11046f3cd2ea5cce9" }; if (!! window.ActiveXObject) {videoObject.html5m3u8 = false} Repeat the practice of grounding the player var player(Object);

Repeated grounding means that in a system where the neutral point is directly grounded, a metal wire is used to connect the grounding device at one or more places on the neutral main line. In the low-voltage three-phase four-wire neutral point directly grounded line, the construction unit should ground the neutral main line and the terminal of the branch line of the distribution line during installation, and ground the zero main line every 1 km. For distribution lines with a location exceeding 50 meters, the neutral line connected to the user should still be grounded repeatedly, and the repeated grounding resistance should not be greater than 10 ohms.

1. Repeated grounding means that the grounding flat steel (concealed installation) or galvanized screw (surface installation) on the enclosure of the distribution box is connected to the grounding grid.

2. The metal conductive parts inside the distribution box are all connected to the PE, such as the component mounting board, door, and secondary door are all connected together.

3. Repeated grounding means that in a system where the neutral point is directly grounded, a metal wire is used to connect the grounding device at one or more places of the neutral main line. To put it bluntly, the enclosure of your distribution box is connected to the ground once, because the neutral point of the system It is grounded.

Use galvanized steel pipe or galvanized angle iron and drive it into the ground for at least 2 meters, and the joints should be treated with anti-corrosion. The galvanized steel will not rust. If it is too small to hit one spot, you can hit a few more, and then use galvanized flat iron to connect. Then connect the protective neutral wire or ground wire to the ground point.

(1) The repetitive grounding of cable overhead lines should adopt a centralized buried grounding body. The interior of the workshop should be grounded repeatedly in a ring or network shape. The protective neutral line and the repeated grounding device should be connected at least at two points. In addition to the power supply line, the farthest point on the opposite corner should also be connected. When the side length of the workshop exceeds 400m, there should be one point connection every 200m.

(2) In a system where cable equipment adopts zero-connection protection, the neutral wires in the following spaces should be grounded repeatedly.

a. Terminals caused by overhead lines and cable lines, and the load ends of the main lines and branch lines of the overhead lines are disconnected from the bow sub-line.

b. The power source, the terminal of the trunk line and branch line of the cable line, and the end of the trunk line and branch line of the overhead line are connected to the load end of the bow sub-line.

c. When metal pipes are used for wiring, the metal pipes and the protective neutral wire should be linked together and grounded repeatedly.

(3) When the transformer capacity is small and the power supply distance is long, the protective ring cannot be used to reliably cut off the power supply. In some poor environment (such as humid, conductive environment), in order to reduce the expected contact voltage value, At the same time of repeated grounding, the overall equi-point measures should be mainly taken (that is, the main metal water pipe, main metal frame, foundation steel bar in the building, etc., the main grounding body and the main neutral line are all connected with metal conductors.

(4) The grounding resistance value of the repeated grounding of the cable line shall not exceed 10 ohms. When the capacity of the distribution transformer is below 100 kVA, the grounding resistance is allowed to work at the neutral point of the low-voltage side of the transformer, and the grounding resistance shall not exceed 10 ohms. The grounding resistance should not exceed 30 ohms, but should not be less than three points.

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