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GB 50556-2010 English PDF

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GB 50556-2010: Code for aseismic design of electrical facilities in industrial plants
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 50556-2010	1219	Add to Cart	8 days	Code for aseismic design of electrical facilities in industrial plants	Valid

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Basic data

Standard ID: GB 50556-2010 (GB50556-2010)
Description (Translated English): Code for aseismic design of electrical facilities in industrial plants
Sector / Industry: National Standard
Classification of Chinese Standard: P15
Classification of International Standard: 91.120.25
Word Count Estimation: 55,555
Date of Issue: 2010-05-31
Date of Implementation: 2010-12-01
Quoted Standard: GB 50011-2001
Regulation (derived from): Bulletin of the Ministry of Housing and Urban No. 632
Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Summary: This Chinese standard applies to the basic design earthquake acceleration value less than or equal to 0. 40g (ie seismic fortification intensity 9 degrees and below) region, and the voltage of 220kV and below electrical equipment of industrial enterprises (hereinafter referred to as electrical equipment) seismic design. Basic design earthquake acceleration values ??greater than 0. 40g regions or sectors with special requirements Electrical equipment of industrial enterprises, the seismic design should be specifically relevant regulations.

GB 50556-2010: Code for aseismic design of electrical facilities in industrial plants

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General 1.0.1 In order to implement the principle of "prevention first" in the electrical engineering design of industrial enterprises, so as to reduce the earthquake damage and loss of electrical equipment and avoid casualties, this code is formulated. 1.0.2 This code is applicable to the seismic design of electrical equipment (hereinafter referred to as electrical equipment) of industrial enterprises with a voltage of 220kV and below in areas where the design basic seismic acceleration value is less than or equal to 0.40g (that is, the seismic fortification intensity is 9 degrees and below). The seismic design of electrical equipment in industrial enterprises with a design basic seismic acceleration value greater than 0.40g or in industries with special requirements shall be carried out in accordance with the relevant special regulations of the state. 1.0.3 The electrical equipment with anti-seismic design according to this code can not be damaged and can continue to be used when it is affected by an earthquake equal to or below the anti-seismic fortification intensity of the area. 1.0.4 The design of electrical equipment in areas where the basic seismic acceleration is 0.05g (that is, the seismic fortification intensity is 6 degrees) and above must be designed for earthquake resistance. 1.0.5 According to the importance and special needs in the power supply system, enterprise electrical equipment can be divided into important electrical equipment and general electrical equipment, and shall meet the following regulations. 1 The electrical equipment with a voltage of 110kV and 220kV or supplying power to the enterprise's primary power load, as well as other electrical equipment that needs to ensure continuous power supply during an earthquake, are important electrical equipment; 2 The electrical equipment other than those mentioned in the preceding paragraph are general electrical equipment. 1.0.6 The design basic seismic acceleration value shall adopt the provisions of China's seismic fortification zoning map; for areas where seismic fortification zoning has been compiled or for engineering sites that have undergone seismic safety evaluation, the approved design ground motion parameters or seismic fortification intensity may be used. Fortify against earthquakes. 1.0.7 This specification stipulates the basic technical requirements for the seismic design of electrical equipment in industrial enterprises. When this specification conflicts with the provisions of relevant national laws and administrative regulations, the provisions of national laws and administrative regulations shall be followed. 1.0.8 The anti-seismic design of electrical equipment shall not only comply with this code, but also comply with the current relevant national standards.

2 Terms and symbols

2.1 Terminology 2.1.1 Aseismic design A specialized design of engineering structures that require seismic fortification. Generally, it includes three aspects. seismic conceptual design, structural seismic calculation and seismic structural measures. 2.1.2 Basic seismic intensity bastcmic intensity In the 50-year period, under general site conditions, the possible earthquake intensity value with a probability of exceeding 10% is equivalent to the intensity value that occurs once in 175 years. 2.1.3 earthquake action effect The internal force (shear force, bending moment, axial force, torque, etc.) or deformation (linear displacement, angular displacement, etc.) of the structure generated by the earthquake. 2.1.4 Seismic influence coefficient The statistical average of the ratio of the maximum acceleration response to the gravitational acceleration of a single-particle elastic system under earthquake action. 2.2 Symbols 2.2.1 Earthquake action and action effect F—seismic action of electrical equipment (structure); m - the mass of electrical equipment; mi—mass concentrated at the operating state of particle i; M - bending moment; T is the natural vibration period of the structure; Tg - characteristic period; σ——tensile (compressive) stress; τ——shear stress. 2.2.2 Material properties E - elastic modulus of the material; K——the lateral stiffness of the system; σ——tensile (compressive) stress; τ——shear stress (Pa); [σ] — design value of allowable stress; [τ] — design value of allowable shear stress. 2.2.3 Geometric parameters A - cross-sectional area; d - the inner diameter of the circular section; D - the outer diameter of the circular section; H - the height of the structure; Hi——calculated height of particle i; I——section moment of inertia; W - section modulus; Z——section moment. 2.2.4 Calculation coefficients g - acceleration of gravity; k - unbalance coefficient; α—seismic influence coefficient; αmax——maximum value of seismic influence coefficient; β—floor power amplification factor; λ——stiffness reduction coefficient; γ—mode shape participation coefficient.

3 Basic requirements for seismic design

3.0.1 The earthquake impact on the area where the electrical equipment is located can be characterized by the following ground motion parameters. 1 Design basic seismic acceleration or seismic fortification intensity; 2 characteristic period. 3.0.2 The corresponding relationship between the design basic seismic acceleration value and the seismic fortification intensity shall comply with the provisions in Table 3.0.2. Table 3.0.2 Correspondence between design basic seismic acceleration values and seismic fortification intensity Note. g is the acceleration of gravity 9.81m/s2 3.0.3 When electrical equipment such as power transformers, vertically arranged three-phase reactors, lightning arresters, circuit breakers, and porcelain bushings have one of the following conditions, seismic check calculations shall be carried out. 1 The voltage is 110kV and 220kV; 2 Areas where the design basic seismic acceleration is 0.20g and above; 3 Design the area where the basic seismic acceleration is 0.10g and 0.15g and the height of the floor or support for placing electrical equipment is greater than 1.8m. 3.0.4 Power capacitors, batteries, high-voltage switchgear, rectifier cabinets, low-voltage power distribution panels, control protection panels, DC panels, uninterruptible power supply equipment, power distribution boxes, etc., and electrical equipment other than those specified in Article 3.0.3 of this code Seismic calculation may not be carried out, but anti-seismic measures shall be taken. 3.0.5 For important electrical equipment, anti-seismic measures shall be taken according to the increase of the seismic fortification intensity of the area by one degree, but when the seismic fortification intensity is 9 degrees, anti-seismic measures shall be taken according to the requirements higher than 9 degrees; the design basic seismic acceleration adopted in the calculation of earthquake action The value should be increased by 0.05g, but it will not be increased when the design basic seismic acceleration is 0.20g and above. 3.0.6 For electrical equipment, products that meet the requirements for anti-seismic fortification shall be selected. If the requirements for anti-seismic fortification cannot be met, anti-seismic measures or measures for shock absorption and isolation shall be taken according to the provisions of Appendix A. 3.0.7 Unless otherwise specified in this code, the allowable stress design value adopted in the seismic design of electrical equipment shall be selected according to the following provisions. 1 The elastic material may be 1.2 times the allowable stress of the material, but not greater than 0.9 times the yield strength of the material at room temperature; 2 Brittle materials may be 1.1 times the strength design value of the material at room temperature, or 0.5 times the failure stress value of the material. 3.0.8 All kinds of electrical equipment should be reliably fixed on the foundation or support.

4 Layout of electrical equipment in substations and distribution stations

4.0.1 Electrical equipment such as outdoor main transformers, rectifier transformers, circuit breakers, lightning arresters, and voltage or current transformers in self-provided power stations, general substations, and substations in important production areas should be arranged in locations that are favorable for earthquake resistance. 4.0.2 In areas where the design basic seismic acceleration is 0.20g and above, the power distribution devices with voltages of 110kV and 220kV should not adopt high-profile or multi-layer layouts; the tubular busbars should adopt suspension structures. 4.0.3 Split-phase reactors should not be arranged vertically.

5 Seismic calculation

5.1 Calculation of seismic action of ground equipment 5.1.1 The seismic calculation of electrical equipment should adopt the following methods. 1 For structures with a height of no more than 30m and mainly shear deformation and electrical equipment similar to single-mass systems (including the part above the foundation ground), simplified methods such as the bottom shear force method may be used; 2 For electrical equipment other than the above paragraph, the vibration mode decomposition response spectrum method should be adopted. 5.1.2 The seismic influence coefficient of electrical equipment (or structure) on the ground shall be determined according to the seismic fortification intensity or design basic seismic acceleration, design seismic grouping, site category and structure natural vibration period, and structure damping ratio (Figure 5.1.2). The maximum value of the horizontal seismic influence coefficient shall be adopted in accordance with the provisions in Table 5.1.2-1; the characteristic period value shall be adopted in accordance with the provisions in Table 5.1.2-2 according to the site category and design earthquake grouping. The site type shall comply with the relevant provisions of the current national standard "Code for Seismic Design of Buildings" GB 50011. Figure 5.1.2 Earthquake influence coefficient curve α-seismic influence coefficient; αmax-maximum value of seismic influence coefficient; T-structure natural vibration period; Tg-characteristic period; η1-decline slope adjustment coefficient of straight-line descending section; η2-damping adjustment coefficient. Table 5.1.2-1 Maximum value of horizontal earthquake influence coefficient Table 5.1.2-2 Characteristic period value (s) 5.1.3 The descending slope adjustment coefficient and damping adjustment coefficient of the straight-line descending section of the seismic influence coefficient curve shall be determined according to the following formula. 1 Down slope adjustment factor. η1=0.009 (1-5ζ) (5.1.3-1) In the formula. η1—the adjustment coefficient of the descending slope in the straight-line descending section of the earthquake influence coefficient; ζ——The damping ratio of electrical equipment (or structure). 2 Damping adjustment factor. ﹙5.1.3-2﹚ In the formula. η2——the damping adjustment coefficient of the seismic influence coefficient, when it is less than 0.55, it should be 0.55. 5.1.4 The damping ratio of electrical equipment (or structure) can be taken as specified in the table below. Table 5.1.4 Damping ratio of electrical equipment (or structure) 5.1.5 When the bottom shear force method is adopted, the standard value of horizontal seismic action of electrical equipment (or structure) (Figure 5.1.5). can be calculated according to the following formula. (5.1.5-1) (5.1.5-2) (5.1.5-3) In the formula. FH — standard value of total horizontal seismic action of electrical equipment (or structure) (N); g—gravitational acceleration (m/s2), take 9.81; α1——horizontal earthquake influence coefficient corresponding to the basic natural vibration period of electrical equipment (or structure); meq——the equivalent total mass (kg) of the electrical equipment (or structure) under operating conditions; λm——equivalent mass coefficient, 1 for single-mass system; Take 0.85 for multi-particle system; Fi—standard value of horizontal seismic action acting on particle i (N); mi—mass (kg) concentrated in the operating state of particle i; Hi—calculated height of particle i (m); n——mass point number; δ—bending deformation influence index, to be selected according to Table 5.1.5. Table 5.1.5 Influence index of bending deformation 5.1.6 When the mode shape decomposition response spectrum method is used, the seismic action standard value and action effect of electrical equipment (or structure) shall be calculated according to the following formula. 1 The standard value of horizontal seismic action of j mode type i particle of electrical equipment. (5.1.6-1) (5.1.6-2) (i=1,2n;j=1,2k) In the formula. FHji—the standard value of horizontal seismic action (N) of the jth vibration mode i particle; αj——Earthquake influence coefficient of the jth natural vibration period of the electrical equipment (or structure); γj——mode shape participation coefficient of the jth mode shape; Xji——horizontal relative displacement of the i-th particle in the j-th vibration mode; k —— number of vibration modes, usually the first (2~3) order vibration modes; when the basic natural vibration period is greater than 1.5s, the number of mode modes should not be less than 3 orders. 2 Action effect of standard value of horizontal earthquake action (including bending moment, shear force, axial force). (5.1.6-3) In the formula. SH—the effect of the standard value of horizontal earthquake action; SHj—the effect of the standard value of horizontal seismic action of mode j. 5.1.7 The design basic seismic acceleration is not less than 0.20g, long cantilever or long-span equipment should be included in the vertical seismic effect. 5.1.8 For electrical equipment perpendicular to the ground, the standard value of vertical seismic action can be taken as 60% of the standard value of horizontal seismic action; for electrical equipment not perpendicular to the ground, the standard value of vertical seismic action can be taken as the horizontal earthquake when the equipment is vertical 70% of the standard value. 5.2 Calculation of earthquake action of floor equipment 5.2.1 The power amplification factor of the floor where the electrical equipment on the floor is located shall be determined according to Figure 5.2.1.Among them, when determining the basic natural vibration period, buildings and structures can be regarded as the rigid foundation of electrical equipment. Figure 5.2.1 The dynamic amplification factor curve of the floor β-floor dynamic amplification factor; Ts-basic natural vibration period (s) of buildings and structures supporting electrical equipment; Te-basic natural vibration period of electrical equipment (s) 5.2.2 When determining the natural vibration period of buildings and structures supporting electrical equipment, their mass should include the mass of electrical equipment and their appendages on the floor. Before the detailed design of the floor (i.e. the construction drawing) is completed, 100kg/m2~150kg/m2 can be taken for steel structure buildings and structures, and 450kg/m2~600kg/m2 can be taken for reinforced concrete structure buildings and structures. 5.2.3 The basic natural vibration period of buildings and structures can be calculated according to the following formula. 1 Basic natural vibration period of steel structure buildings and structures. Ts = 0.03Hs (5.2.3-1) In the formula. Ts - natural vibration period (s); Hs—the total height of buildings and structures (m). 2 Basic natural vibration period of reinforced concrete buildings and structures. (5.2.3-2) 3 Basic natural vibration period of brick-concrete structure buildings and structures. (5.2.3-3) 5.2.4 The calculation of the standard value of the horizontal seismic action of the electrical equipment on the floor shall comply with the following regulations. 1 The seismic calculation model of multi-storey buildings and structures supporting electrical equipment may be determined according to Figure 5.1.5 of this code; 2 The acceleration coefficient of the i-th floor is to be calculated according to the following formula. (5.2.3-3) In the formula. ——the acceleration coefficient of the i-th floor; Fi—standard value of horizontal seismic action of the i-th floor (N). 3 The horizontal seismic influence coefficient of the electrical equipment on the i-th floor shall be calculated according to the following formula. (5.2.4-2) In the formula. αsi——horizontal seismic influence coefficient of the electrical equipment on the i-th floor. 4 The standard value of horizontal seismic action of electrical equipment on the i-th floor shall be calculated according to the following formula. (5.2.4-3) Where. ——the standard value of horizontal seismic action (N) of the electrical equipment on the i-th floor. 5 If the calculated horizontal seismic action standard value of the electrical equipment on the floor is less than the horizontal seismic action standard value obtained by building on the ground, the horizontal seismic action standard value obtained by building on the ground shall be adopted. 5.2.5 In the preliminary design stage, the standard value of horizontal seismic action of electrical equipment on floors can be calculated by the following formula. (5.2.5) 5.3 Power transformers 5.3.1 The transformer shall carry out seismic check calculation for the following parts. 1 Transformer anchor bolts; 2 The connecting pipe between the transformer and the cantilever radiator; 3 Legs of transformer oil conservator. 5.3.2 The anti-seismic calculation of foundation bolts for transformers (including arc suppression coils, oil-immersed reactors, etc.) shall comply with the following regulations. 1 The calculation of the horizontal earthquake action of the transformer body on the ground shall comply with the provisions of Article 5.1.5 of this code, and the horizontal earthquake influence coefficient may be determined according to the provisions of Table 5.1.2-1 of this code; 2 The calculation of the horizontal earthquake action of the transformer body on the floor shall comply with the provisions in Section 5.2 of this code, where the basic natural vibration period of the transformer may be taken as 0.1s; 3 Various effects produced by anchor bolts under earthquake action shall be calculated according to the following provisions. 1) When the design basic seismic acceleration is less than or equal to 0.15g, the tensile stress should be calculated according to the following formula. (5.3.2-1) 2) When the design basic seismic acceleration is greater than 0.15g, the tensile stress shall be calculated according to the following formula and shall be included in the vertical seismic action. (5.3.2-2) In the formula. σ0——tensile stress of anchor bolts (Pa); FH——the standard value of horizontal earthquake action of the transformer body (N); Fv——standard value of vertical seismic action of transformer body (N); n - the number of anchor bolts; Ab - the effective cross-sectional area of each anchor bolt (m2); lb - the minimum distance between anchor bolts (m); Hv——the distance from 1/2 of the height of the transformer body to the top surface of the foundation (m); meq—the equivalent total mass of the transformer (kg). 3) When the design basic seismic acceleration is less than or equal to 0.15g, the shear stress should be calculated according to the following formula. (5.3.2-3)......

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