Equipment layout in the arrangement of substation equipment, we also present problems Nanyang voltage power distribution room installation, even in violation of the provisions of the mandatory provisions, are only an example as follows: 1) high and low voltage distribution system diagram is inconsistent with the plan. Its manifestations are two types: one is a system diagram with the plan in the cabinet, on the contrary the order screen. When the system diagram is for the cabinet to see the front panel, which is arranged from left to right 1,2,3 ...... n; and in the plan is for the back panel, which is arranged from left to right 1, 2,, 3 ...... n, inevitably backwards. The key is to avoid errors in the system and plan should be for the cabinet, arranged in front of the screen from left to right order. Second, there is a plan on the bus bridge between the double-face arrangement of the power distribution panel, but failed to draw the system diagram. 2) low-voltage distribution screen in front, rear screen channel width does not meet the new regulatory requirements. After the screen sometimes after as Jinju wall 700mm, 1800mm apart only when the drawer Low screen double-face arrangement according to specifications GB50053-94 section 4.2.9 stipulates that the low-voltage distribution in a row before indoor distribution panel screen layout, screen The minimum width of the channel: After its screen channel, fixed and drawer are 1000mm; its screen before passage, fixed single row arranged to 1500mm, arranged in a single row drawer 1800mm, double-face arranged fixed 2000mm, Drawer double face arranged 2300mm. Only when the building wall in case of local projections class column, the protruding portion of the channel width can be reduced by 200mm. Recommended use D, yn11 tie line transformer recent years, the use of the system in TN D, yn11 tie line group of the transformer is very common, but there are many projects still use Y, ynO tie line group of the transformer, the reason The main advantage is the former clear. In GB50052-95 "supply and distribution system design" in Article 6.0.7 states: "In the low-voltage grid TN and TT earthing system type, and should use D, yn11 tie line group as a three-phase transformer distribution transformers . " Here, "should use" grounds, mainly based on D, yn11 tie line than Y, ynO tie line transformer has the following advantages: 1) in favor of the higher harmonic current suppression. And more than three times higher harmonic excitation current in the primary access into △ shape conditions, can be formed in the primary circulation, help suppress harmonic current Nanyang low voltage power distribution room installation, ensure the quality of the supply waveform. 2) in favor of the unit ground fault fault removal. Because D, yn11 tie line than Y, zero sequence impedance is much smaller ynO knot lines Nanyang distribution room installation, the transformer single phase power distribution system to expand more than three times the short-circuit current, it is beneficial to the single-phase short-circuit fault of resection . 3) the ability to take full advantage of the device of the transformer. Y Nanyang distribution room installation specifications, ynO tie line transformer neutral current requirement does not exceed 25% of the low-voltage winding rated current (see Section 6.0.8 GB50052-95 article), severely limiting access with a single-phase load capacity, Effect of the full use of the capacity of transformer equipment; and D, the neutral current transformer yn11 junction line is allowed to reach more than 75% of the phase current, even up to 100% of the phase current, so that the capacity of the transformer can be fully utilized, which single-phase load capacity of the system is essential. Therefore, low-voltage grid type TN and TT earthing system, the recommended D, yn11 tie line group of distribution transformers. Nanyang Nanyang distribution room installation distribution room _ _ Installation program Teflon electricity (certified merchants) provided by Nanyang Fulong Power Engineering Company Limited. Nanyang Fulong Power Engineering Co., Ltd. (www.nyfulong.com) is specialized in the "" business, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Dong Zhipeng.