0.4kV substation design found in some of the problems, according to current national norms and standards for a brief analysis and make specific suggestions for improvement.
Keywords: A Summary of the sources of distribution substation:
10,6 kV distribution reach of 10,UGG bailey button,6 / 0.4kV substation design, project construction is very common and A very important work, its normative and technical are strong, many aspects related to national implementation of the mandatory provisions. Designed to do both transformation and distribution to the implementation of national norms and regulations related to the current, but also to meet the specific requirements of the local electricity sector, there would be various problems affecting the quality of design and progress of the project. In order to do the design of substation, now I am in the review of our hospital substation design drawings found in the part of the problems sorted out, a brief analysis of interaction with you so together.
1. substations and distribution by the name of the project design in the use of terminology when accurate, can not be random. In the design documents for specific projects should not generally use the About a category or a specific individual should be referred to as In GB50053-94 explanation is that Devices and power distribution equipment in the substation have time to buck with the main features include high and medium voltage distribution devices are known as 10/0.4kV transformers are known as > 2. charged conductor system, the type and type of earthing system according to the International Electrotechnical Commission IEC-TC64 Article 312, the type of distribution system has two characteristics, namely, the type system of charged conductors, such as three-phase four-wire system,UGGs, and system grounded type, such as TN-C-S system. shall not in official documents of the three-phase four-wire TN-S system, known as page an N line,UGG boots clearance, and do not include the PE through the normal operating current line. the system. -S and TN-C-S Grounding delineation of sometimes confusing. Grounding system is generally to a substation or a transformer of the power supply in scope. neutral line N line and protection line PE line only in the local area, such as a building or one floor apart, should be said that TN-C-S system. TN system, a residual current protective devices in the load side of electrical installations in a separate grounding conductor when exposed, can be called local TT system. Source: tede.cn
3. hierarchical classification standard unit of measurement terms and design documents in a variety of grading and classification of terminology, with national standards, industry standardization, not confusion. frequently used terms such as: electric load should be called one, two, three loads, here instead of area is divided into 10,11, 21,22,23 fire hazard area is divided into areas, where both use the , Ⅱ, Ⅲ class of dangerous places, where the use of , and not to use lx, km, etc. should all be using the legal units of measurement, with particular attention to the case of unit symbols the letters correctly, to where the unit transformed from the symbol name, such as A, V, W, N, Pa and the trillion or more prefix symbols, such as M, G should be capitalized; In addition, it will be lowercase, such as kV, MW, kvar, km and so on. relevant units of measurement information can be found in . Source: http www.tede.cn
4. the requirements of civil engineering in the GB50053-94 professional requirements, we still exist in the implementation of a number of specific questions are listed in the following cases only slightly analysis, the future should be emphasis on design.
1) Fire Protection cornice: the workshop attached to substation selection oil-immersed power transformers, some not in the transformer room set fire cornice above the door. in the construction standard GB50053-94 mandatory provisions of section 6.1.8 to provide that electrical equipment with flammable oil, its position above the bottom wall opening width of not less than 1.0m should be set fire overhangs the power distribution room located only one exit, or the establishment of two export but close to the same end. This does not comply with GB50053-94 section 6.2.6 of the Ordinance, regulatory requirements, distribution room should be arranged in both ends about the height of up to 800mm, so all references to civil conditions storey height of the beam should be.
4) Office: Some designs will be based in the duty room in the corner inaccessible. It does not meet GB50053 -94 section 4.1.6 article, which states that Voltage power distribution room and duty room should be direct or through the channels the same, the duty room should have direct access to the outdoors or in the aisle leading to the door. adjustment of the line and out of and in the future, should be the main cable channel of all communication and control cables are connected. Source: www.tede
6) Cable boundaries Room: Some dividing room does not meet the requirements of the electricity sector. Beijing Power Supply Bureau, Beijing area provides the user must set the cable 10kV boundaries room as the total power into the line of the project room. the location of the cable should be close to room boundaries power line direction, and close to the building facade. The area is generally 6m × 3.5m is about 20mm2, clear height of not less than 2.7m, under clear height of not less than 1.8m cable sandwich, and let the person 600mm × 600mm hole and climb the ladder. cable chamber in the absence of boundaries in the basement of the building generally located in the floor; and buildings in a basement, regardless of underground layers, cable boundaries rooms are located in the basement level requirements. Under the provisions of Beijing Power Supply Bureau, Cable Power Supply Bureau, Beijing normalized boundary Room management, so the cable boundaries room door should open outwards to the public walkway.
5. equipment layout in the layout of substation equipment, we have problems and that even the violation of mandatory provisions, is to name as follows:
1) high and low voltage distribution system map inconsistent with the plan. its performance in two forms: one is the system diagram and floor plan in the cabinet opposite the order screen. See system diagram when the front panel for the cabinet will be arranged from left to right 1,2,3 ... ... n; while the plan is for the screen on the back of it from left to right 1,2, , 3 ... ... n, necessarily backwards.
To avoid this error, the key is in the system and a diagram on the screen should be facing the front counter in sequence from left to right. The second is double-face on the floor plan layout of bus bridge between the power distribution panel, but failed to draw the diagram in the system. Source: http www.tede.cn
2) low voltage distribution panel screen before the screen after channel width does not meet the new specifications. such as the screen sometimes Jinju after the wall 700mm, drawer-type arrangement of Low screen when double-face distance of only 1800mm. According to the specification GB50053-94 Section 4.2.9 provides low voltage power distribution room layout with rows power screen screen before the screen after a minimum width of the channel: after the passage of its screen, fixed and drawer are 1000mm; the screen before the channel, fixed single-row layout is 1500mm, drawer-style single-row layout is 1800mm, the fixed double-face type arrangement is 2000mm, double drawer face to face arrangement as 2300mm. Only when the building wall in case of class of local protruding columns, the protruding part of the channel width can be reduced 200mm.
3) After the cabinet panel distribution channels does not meet the regulatory requirements of export volume. as the norm mandatory provisions, GB50053-94 Section 4.2.6 provides that Two low-voltage distribution equipment exports more than 15m when the distance between, there should be increasing exports. >
4) use of power distribution lines hanging indoor lamps,bailey UGG boots, chain hoists, and installed just above the power distribution unit does not meet the safety requirements. GB50053-94 Section 6.4.3 states that above should not be decorated lamps and for surface lines, power distribution room when the top of the bare conductor arrangement lamps, lighting and the level of bare conductor spacing of not less than 1.0m, shall not be used lamp cord hanging chain and lifting. Low screen at the top of a bus decorated copper usually not closed, Ugg boots outlet, so this provision to be performed. switchboard room boom can be installed with a trough-type fluorescent lamps.
5) equipped substation grounding laying flat along the wall, but did not set up a temporary grounding terminal. In order to facilitate testing and maintenance temporarily grounded, should be properly set up the temporary grounding terminal. grounding terminal approach can be found in the national standard atlas 86D563 page. Source: tede
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