CN104269745B - Transformer station's single span suspention cast bus bar model selection method for arranging - Google Patents

Abstract

The invention discloses a kind of transformer station single span suspention cast bus bar model selection method for arranging, including: the span of initial setting tube type bus and spaced apart；Selected certain model bus；Determine under various operating mode, the value of Fundamentals；Calculate under deadweight and maximum wind velocity effect respectively, under deadweight and icing effect, short circuit and stress suffered by tube type bus during earthquake；Judge suffered by the tube type bus calculated in the case of above-mentioned every kind, whether stress is respectively less than the maximum allowable stress of tube type bus；Calculate tube type bus amount of deflection；Judge that whether tube type bus amount of deflection is less than setting value.The method have the benefit that the impact having taken into full account DIFFERENT METEOROLOGICAL CONDITIONS factor to tube type bus, achieve the reasonable integration of electricity and mechanics, overcome and Practical Project only relies on electricity theory or the drawback of experience selection single span suspention tube type bus, reduce the error that human factor is caused, it is ensured that transformer station properly functioning.

Description

Transformer station's single span suspention cast bus bar model selection method for arranging

Technical field

The present invention relates to transformer station's single span suspention cast bus bar model selection method for arranging.

Background technology

In transformer station's layout design, tube type bus scheme is the main flow in outdoor arrangement, and arrangement is various, cast The arrangement form of bus is broadly divided into support tube type bus and suspention tube type bus, wherein supports the selection method of tube type bus increasingly Perfect, and the selection method suspending tube type bus in midair is substantially at the blank stage, does not has perfect type selecting process and counting system, " electricity Power design of electric engineering handbook " and relevant books and journal article also there is no solution.

Suspention tube type bus is applied in 500kV and the transformer station of higher voltage grade more, and type selecting is mainly according to busbar carrying capacity and work Journey experience selects, owing to domestic 500kV and above transformer station arrangement ratio are more conventional, and used busbar carrying capacity Greatly, thus the tube type bus diameter selected according to current-carrying capacity is very big, substantially can meet the requirement of stress and amount of deflection.But for outstanding Hang the transformer station that tube type bus span is very big, load change in location, busbar carrying capacity are less, particularly with foreign project, If comprehensively calculating without system and carrying out tube type bus type selecting, reasonable construction, used tube type bus is probably in some work Being unsatisfactory for stress and amount of deflection requirement under condition, its consequence the most then causes bus bent, and affects being reliably connected of electrical equipment；Heavy then lead Causing bus directly to rupture, transformer station has a power failure, and brings great hidden danger to safety in production.

How rationally the most scientifically selecting suspention tube type bus is a great problem in Substation Design, and be directly connected to transformer station can By property, the stability of power system, concern the security of production activity, affect people's security of the lives and property.

Summary of the invention

The purpose of the present invention is contemplated to solve the problems referred to above, it is proposed that single span suspention cast bus bar model selection layout side of a kind of transformer station Method, the method has taken into full account the impact on tube type bus of the DIFFERENT METEOROLOGICAL CONDITIONS factor, it is achieved that transformer station's suspention tube type bus Accurately type selecting.

To achieve these goals, the present invention adopts the following technical scheme that

A kind of transformer station single span suspention cast bus bar model selection method for arranging, comprises the steps:

Step one: the span of initial setting tube type bus and spaced apart；

Step 2: selected certain model bus in alternative tube type bus；

Step 3: determine under various operating mode, the value of Fundamentals；Specifically include: take with characteristic value of load about safety coefficient Value standard, the value value standard of wind factor, the value value standard of icing factor, the computational methods of short-circuit electromotive force, earthquake The computational methods of power, tube type bus Load Combination condition, the maximum allowable stress of material and the deflection limit value of tubular conductor；

Step 4: collection insulator chain is joined along projected length parameter, the vertical projected length of insulator chain of tube type bus axis respectively Number and the weight parameter of insulator chain, respectively calculate deadweight and maximum wind velocity effect under, deadweight and icing effect under, short circuit with And stress suffered by tube type bus during earthquake；

Step 5: judging whether stress suffered by the tube type bus calculated in the case of above-mentioned every kind be respectively less than that tube type bus is maximum allowable should Power, if it is, go to step 6；If at least in the case of one, stress suffered by tube type bus is more than or equal to tube type bus Big allowable stress, then traversal step two to step 4；

Step 6: calculate tube type bus amount of deflection；

Step 7: judge in step 6 tube type bus amount of deflection whether less than setting value, if it is, determine the model of tube type bus, Span and spaced apart are respectively in step one and step 2 tube type bus model, span and the spaced apart set, otherwise, traversal step Rapid two to step 6.

In described step 4, calculate stress suffered by tube type bus under deadweight and maximum wind velocity effect method particularly includes:

(4-11) the spaning middle section moment M corresponding to computer tube deadweight_Gz；Calculate the spaning middle section corresponding to gravity of downlead Moment M_jz；Calculate the spaning middle section moment M corresponding to maximum wind velocity_fz；Described maximum wind velocity according to the difference in geographical position, Take the maximum of relevant position historical wind speed data；

(4-12) it is respectively synthesized spaning middle section moment M according to the section turn moment of above-mentioned calculating₁

$M_1=\sqrt{M_{\mathrm{fz}}^2+(M_{\mathrm{Gz}}^2+M_{\mathrm{jz}}^2)}$

(4-13) the pulling force R of tube type bus is calculated₁；

$R_1=\frac{h}{v}(\mathrm{PG}+\mathrm{PC})$

In formula, h is the insulator chain projected length along tube type bus axis；V is the vertical projected length of insulator chain；PG is pipe The half of all vertical loads on type bus；PC is the gravity of insulator chain；

(4-14) according to the pulling force R of tube type bus₁With synthesis spaning middle section moment M₁Calculate stress σ₁；

${\mathrm{\σ}}_1=\frac{M_1}{W}+\frac{R_1}{A};$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

In described step 4, calculate stress suffered by tube type bus under deadweight and icing effect method particularly includes:

(4-21) the spaning middle section moment M corresponding to computer tube deadweight_Gz；Calculate the spaning middle section corresponding to gravity of downlead Moment M_jz；Calculate spaning middle section moment M corresponding during ice load_bz；The span centre corresponding to wind speed when calculating icing cuts Face moment M_bfz；

(4-22) according to the section turn moment of above-mentioned calculating synthesize spaning middle section moment M '₁；

$M_1^{\′}=\sqrt{M_{\mathrm{bfz}}^2+(M_{\mathrm{Gz}}^2+M_{\mathrm{jz}}^2+M_{\mathrm{bz}}^2)}$

(4-23) the pulling force R of tube type bus is calculated₂；

$R_2=\frac{h}{v}(\mathrm{PG}+\mathrm{PC})$

R₂With R₁Computing formula difference is, different to the calculating value of PG.

(4-24) according to the pulling force R of tube type bus₂With synthesis spaning middle section moment M '₁Calculate stress σ '₁；

${{\mathrm{\σ}}^{\′}}_1=\frac{{M_1}^{\′}}{W}+\frac{R_2}{A};$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

In described step 4, stress suffered by tube type bus when calculating short circuit method particularly includes:

(4-31) the spaning middle section moment M corresponding to computer tube deadweight_Gz；Calculate the spaning middle section corresponding to gravity of downlead Moment M_jz；Calculate spaning middle section moment M corresponding during short circuit_dz；Calculate the spaning middle section corresponding to 50% maximum wind velocity curved Square M_50%fz；

(4-32) spaning middle section moment M is synthesized according to the section turn moment of above-mentioned calculating "₁；

$M_1^{\′\′}=\sqrt{(M_{\mathrm{dz}}^2+M_{50\%\mathrm{fz}}^2)+(M_{\mathrm{Gz}}^2+M_{\mathrm{jz}}^2)}$

(4-33) the pulling force R of tube type bus is calculated₃；

$R_3=\frac{h}{v}(\mathrm{PG}+\mathrm{PC})$

The pulling force R of tube type bus under Short-circuit Working Condition₃With the pulling force R of tube type bus under deadweight maximum wind velocity operating mode₁Identical.

(4-34) according to the pulling force R of tube type bus₃With synthesis spaning middle section moment M "₁Calculate stress σ "₁；

${{\mathrm{\σ}}^{\′\′}}_1=\frac{{M_1}^{\′\′}}{W}+\frac{R_3}{A};$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

In described step 4, stress suffered by tube type bus when calculating earthquake method particularly includes:

(4-41) the spaning middle section moment M corresponding to computer tube deadweight_Gz；

Calculate the spaning middle section moment M corresponding to gravity of downlead_jz；

Calculate spaning middle section moment M corresponding during earthquake_ez；

Calculate the spaning middle section moment M corresponding to 25% maximum wind velocity_25%fz；

(4-42) spaning middle section moment M is synthesized according to the section turn moment of above-mentioned calculating " '₁；

$M_1^{\′\′\′}=\sqrt{(M_{\mathrm{ez}}^2+M_{25\%\mathrm{fz}}^2)+(M_{\mathrm{Gz}}^2+M_{\mathrm{jz}}^2)}$

(4-43) the pulling force R of tube type bus is calculated₄；

R₄=R₁+R_V

R in formula_VFor the pulling force under Vertical Earthquake Loads.

(4-44) according to the pulling force R of tube type bus₄With synthesis spaning middle section moment M " '₁Calculate stress σ " '₁；

${{\mathrm{\σ}}^{\′\′\′}}_1=\frac{{M_1}^{\′\′\′}}{W}+\frac{R_4}{A};$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

Spaning middle section moment M corresponding to the deadweight of described computer tube_GzMethod be:

$M_{\mathrm{Gz}}=q(\frac{l^2}{8}-\frac{c^2}{2})$

Wherein, q is the gravity of tube type bus line unit length；L is the distance between tube type bus two hitch point；C is hitch point And the distance between tube type bus thread end.

During wind speed, short circuit, 50% maximum wind velocity and 25% maximum wind velocity when described calculating maximum wind velocity, ice load, icing The method of the spaning middle section moment of flexure that the method for corresponding spaning middle section moment of flexure is corresponding when conducting oneself with dignity with computer tube is identical, simply difference The gravity q of the tube type bus unit length under operating mode determines according to actual condition.

The described spaning middle section moment M corresponding to gravity calculating downlead_jzMethod particularly includes:

$M_{\mathrm{jz}}=\frac{G_{P}l}{4}+\frac{G_W(l-2s)}{4}-\frac{\mathrm{sc}{G}_W}{l+2c}$

Wherein, G_P、G_WIt is the gravity of two downleads respectively；S is the distance between two downleads, and q is that tube type bus unit is long The gravity of degree；L is the distance between tube type bus two hitch point；C is the distance between hitch point and tube type bus thread end.

Spaning middle section moment M corresponding during described calculating earthquake_ezMethod particularly includes:

$M_{\mathrm{ez}}=\frac{F_{1}l}{4}-\frac{F_{2}c}{2}-\frac{F_{3}c}{2}$

Wherein, F₁、F₂、F₃、F₄、F₅Being respectively geological process power, its active position determines according to quality condensation methods.

Described step 6 calculates tube type bus amount of deflection method particularly includes:

Pipe, when re-computation, calculates mid-span deflection y '_zg:

$y_{\mathrm{zg}}^{,}=\frac{{\mathrm{ql}}^2}{\mathrm{EJ}}(\frac{{5l}^2}{384}-\frac{c^2}{16})$

During downlead Gravity calculation, calculate mid-span deflection y '_zj:

$y_{\mathrm{zj}}^{,}=\frac{1}{\mathrm{EJ}}[\frac{{\mathrm{Pl}}^3}{48}-\frac{l^2}{8}\frac{\mathrm{csW}}{l+2c}+\frac{W}{48}(l-2s)(l^2+2\mathrm{ls}-2s^2)]$

Synthesis mid-span deflection y ':

Y '=y '_zg+y’_zj

Wherein, q is the gravity of tube type bus unit length；L is the distance between tube type bus two hitch point；C be hitch point with Distance between tube type bus thread end, E is tube type bus elastic modelling quantity, and J is tube type bus cross sectional moment of inertia, and W is cast The section factor of bus, s is the distance between two downleads.

The invention has the beneficial effects as follows:

The inventive method has taken into full account the impact on tube type bus of the DIFFERENT METEOROLOGICAL CONDITIONS factor, it is achieved that electricity and mechanics reasonable Integrating, overcome and only rely on electricity theory or the drawback of experience selection single span suspention tube type bus in Practical Project, the method is single Across suspention cast bus bar model selection system, foundation comprehensive, reliable, the layout of single span suspention tube type bus can be determined the most accurately Mode, reduces the error thinking that factor is caused, and improves the security produced, it is ensured that transformer station properly functioning.

Accompanying drawing explanation

Fig. 1 (a) is single span column pipe type bus force analysis figure under load；

Fig. 1 (b) is single span column pipe type bus force analysis figure under earthquake；

Fig. 1 (c) is single span column pipe type bus force analysis figure under evenly load；

Detailed description of the invention:

The present invention will be further described with embodiment below in conjunction with the accompanying drawings:

As shown in Fig. 1 (a), this figure is mainly illustrated to suspend tube type bus in midair by stressing conditions during Concentrated load.W, P in figure For load point, Q is counterweight point of load application.Column pipe is female can produce mid span moment and pulling force under W, P, Q effect, for Computer tube mother's stress is prepared.

As shown in Fig. 1 (b), this figure is mainly illustrated to suspend the stressing conditions under tube type bus geological process in midair.F in figure₁、F₂、F₃ For geological process power, according to quality polycondensation principle, force position is it is believed that immobilize.V is the insulator chain of suspention bus The suffered honest power of hanging, column pipe is female under seismic force effects, can produce mid span moment and pulling force, do standard for computer tube mother's stress Standby.

As shown in Fig. 1 (c), this figure is mainly illustrated to suspend tube type bus in midair by stressing conditions during Uniform Load.In figure, q is Evenly load, column pipe is female under Uniform Load, can produce mid span moment, prepare for computer tube mother's stress.

In Fig. 1 (a)～Fig. 1 (c), the formula of calculated bending moment and the honest power of hanging is different.

Transformer station's suspention cast bus bar model selection method for arranging, comprises the following steps:

Step one: the span of initial setting tube type bus and spaced apart；

Step 2: selected certain model bus in alternative tube type bus；

Step 3: determine under various operating mode, the value of Fundamentals；Specifically include: take with characteristic value of load about safety coefficient Value standard, the value value standard of wind factor, the value value standard of icing factor, the computational methods of short-circuit electromotive force, earthquake The computational methods of power, tube type bus Load Combination condition, the maximum allowable stress of material and the deflection limit value of tubular conductor；

Step 4: collection insulator chain is joined along projected length parameter, the vertical projected length of insulator chain of tube type bus axis respectively Number and the weight parameter of insulator chain, respectively calculate deadweight and maximum wind velocity effect under, deadweight and icing effect under, short circuit with And stress suffered by tube type bus during earthquake；

Step 5: judging whether stress suffered by the tube type bus calculated in the case of above-mentioned every kind be respectively less than that tube type bus is maximum allowable should Power, if it is, go to step 6；If at least in the case of one, stress suffered by tube type bus is more than or equal to tube type bus Big allowable stress, then traversal step two to step 4；

Step 6: calculate tube type bus amount of deflection；

Step 7: judge in step 6 tube type bus amount of deflection whether less than setting value, if it is, determine the model of tube type bus, Span and spaced apart are respectively in step one and step 2 tube type bus model, span and the spaced apart set, otherwise, traversal step Rapid two to step 6.

Wherein, specifically comprising the following steps that of stress suffered by tube type bus under deadweight and maximum wind velocity effect is calculated

(4-1) the spaning middle section moment of flexure corresponding to computer tube deadweight, the gravity of downlead, maximum wind velocity；

(4-2) pulling force of tube type bus is calculated；

(4-3) synthesis controlling sections moment of flexure；

(4-4) stress is calculated and compared with maximum allowable stress according to the section turn moment of synthesis, the pulling force of tube type bus；

Under calculating deadweight and icing effect, stress suffered by tube type bus specifically comprises the following steps that

(6-1) the spaning middle section moment of flexure corresponding to wind speed when computer tube deadweight, the gravity of downlead, ice load, icing；

(6-2) pulling force of tube type bus is calculated；

(6-3) synthesis controlling sections moment of flexure；

(6-4) stress is calculated and compared with maximum allowable stress according to the section turn moment of synthesis, the pulling force of tube type bus；

Calculate specifically comprising the following steps that of stress suffered by the lower tube type bus of short circuit

(8-1) the spaning middle section moment of flexure corresponding to computer tube deadweight, the gravity of downlead, short-circuit electromotive force, 50% maximum wind velocity；

(8-2) pulling force of tube type bus is calculated；

(8-3) synthesis controlling sections moment of flexure；

(8-4) stress is calculated and compared with maximum allowable stress according to the section turn moment of synthesis, the pulling force of tube type bus；

When calculating earthquake, stress suffered by tube type bus specifically comprises the following steps that

(10-1) the spaning middle section moment of flexure corresponding to computer tube deadweight, the gravity of downlead, geological process, 25% maximum wind velocity；

(10-2) pulling force of tube type bus is calculated；

(10-3) synthesis controlling sections moment of flexure；

(10-4) stress is calculated and compared with maximum allowable stress according to the section turn moment of synthesis, the pulling force of tube type bus；

In Practical Project, owing to the quantity of downlead is different, the present invention is analysing in depth the quantity that downlead is likely to occur, Incorporation engineering application demand, have selected one the most more adverse conditions, grinds the type selecting layout of suspention tube type bus Study carefully.

A, pipe, when re-computation, calculates spaning middle section moment M according to formula_Gz:

$M_{\mathrm{Gz}}=q(\frac{l^2}{8}-\frac{c^2}{2})---\left(1\right)$

Wherein, q is the gravity (comprising strong wind, icing, Short-circuit Working Condition) of tube type bus line unit length；L is tube type bus two Distance between hitch point；C is the distance between hitch point and tube type bus thread end.

B, during downlead (gold utensil) Gravity calculation, calculates spaning middle section moment M according to formula_jz:

$M_{\mathrm{jz}}=\frac{G_{P}l}{4}+\frac{G_W(l-2s)}{4}-\frac{\mathrm{sc}{G}_W}{l+2c}---\left(5\right)$

Wherein, G_P、G_WIt is the gravity of downlead；S is the distance between two downleads.

C, when seismic force calculates, calculates spaning middle section moment M according to formula_dz:

$M_{\mathrm{dz}}=\frac{F_{1}l}{4}-\frac{F_{2}c}{2}-\frac{F_{3}c}{2}---\left(12\right)$

Wherein, F₁、F₂、F₃、F₄、F₃It is geological process power.

D, calculates the spaning middle section moment M of synthesis respectively according to formula.

$M=\sqrt{M_s^2+M_c^2}---\left(19\right)$

Wherein, M_sIt it is the synthesis of all horizontal bending moments；M_cIt it is the synthesis of all vertical bending moment.

E, calculates the pulling force R of tube type bus according to formula.

$R=\frac{h}{v}(\mathrm{PG}+\mathrm{PC})---\left(20\right)$

Wherein, h is the insulator chain projected length along tube type bus axis；V is the vertical projected length of insulator chain；PG is pipe The half of all vertical loads on type bus；PC is gravity and the gravity of the upper icing that may be present of string of string.

F, according to formula, is calculated stress by the spaning middle section moment M of the pulling force R of bus, synthesis_σ；

$\mathrm{\σ}=\frac{M}{W}+\frac{R}{A}---\left(21\right)$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

When stress when stress when calculating deadweight and stress, deadweight and icing during maximum wind velocity respectively, short circuit, earthquake should Power, if arbitrary calculating stress is more than maximum allowable stress under these operating modes, then reselects tube type bus pattern, then proceedes to meter Calculate.

G, pipe, when re-computation, calculates mid-span deflection y ' according to formula_zg:

$y_{\mathrm{zg}}^{,}=\frac{{\mathrm{ql}}^2}{\mathrm{EJ}}(\frac{{5l}^2}{384}-\frac{c^2}{16})---\left(22\right)$

H, during downlead Gravity calculation, calculates mid-span deflection y ' according to formula_zj:

$y_{\mathrm{zj}}^{,}=\frac{1}{\mathrm{EJ}}[\frac{{\mathrm{Pl}}^3}{48}-\frac{l^2}{8}\frac{\mathrm{csW}}{l+2c}+\frac{W}{48}(l-2s)(l^2+2\mathrm{ls}-2s^2)]---\left(23\right)$

I, calculates according to formula and synthesizes mid-span deflection y ':

Y '=y '_zg+y’_zj (24)

If calculating amount of deflection more than 0.5D the diameter of tube type bus (D be), then reselect tube type bus pattern, then proceed to meter Calculate.

Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not limit to scope System, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art need not pay Go out various amendments or deformation that creative work can make still within protection scope of the present invention.

Claims (7)

1. transformer station's single span suspention cast bus bar model selection method for arranging, is characterized in that, comprise the steps:

Step one: the span of initial setting tube type bus and spaced apart；

Step 2: selected certain model bus in alternative tube type bus；

Step 3: determine under various operating mode, the value of Fundamentals；Specifically include: take with characteristic value of load about safety coefficient Value standard, the value value standard of wind factor, the value value standard of icing factor, the computational methods of short-circuit electromotive force, earthquake The computational methods of power, tube type bus Load Combination condition, the maximum allowable stress of material and the deflection limit value of tubular conductor；

Step 4: collection insulator chain is joined along projected length parameter, the vertical projected length of insulator chain of tube type bus axis respectively Number and the weight parameter of insulator chain, respectively calculate deadweight and maximum wind velocity effect under, deadweight and icing effect under, short circuit with And stress suffered by tube type bus during earthquake；

Step 5: judging whether stress suffered by the tube type bus calculated in the case of above-mentioned every kind be respectively less than that tube type bus is maximum allowable should Power, if it is, go to step 6；If at least in the case of one, stress suffered by tube type bus is more than or equal to tube type bus Big allowable stress, then traversal step two to step 4；

Step 6: calculate tube type bus amount of deflection；

Step 7: judge in step 6 tube type bus amount of deflection whether less than setting value, if it is, determine the model of tube type bus, Span and spaced apart are respectively in step one and step 2 tube type bus model, span and the spaced apart set, otherwise, traversal step Rapid two to step 6.

2. a kind of transformer station as claimed in claim 1 single span suspention cast bus bar model selection method for arranging, is characterized in that, described step In rapid four, calculate stress suffered by tube type bus under deadweight and maximum wind velocity effect method particularly includes:

(4-11) the spaning middle section moment M corresponding to computer tube deadweight_Gz；Calculate the spaning middle section corresponding to gravity of downlead Moment M_jz；Calculate the spaning middle section moment M corresponding to maximum wind velocity_fz；Described maximum wind velocity according to the difference in geographical position, Take the maximum of relevant position historical wind speed data；

(4-12) it is respectively synthesized spaning middle section moment M according to the section turn moment of above-mentioned calculating₁

$M_1=\sqrt{M_{fz}^2+(M_{Gz}^2+M_{jz}^2)}$

(4-13) the pulling force R of tube type bus is calculated₁；

$R_1=\frac{h}{v}(PG+PC)$

In formula, h is the insulator chain projected length along tube type bus axis；V is the vertical projected length of insulator chain；PG is pipe The half of all vertical loads on type bus；PC is the gravity of insulator chain；

(4-14) according to the pulling force R of tube type bus₁With synthesis spaning middle section moment M₁Calculate stress σ₁；

${\mathrm{\σ}}_1=\frac{M_1}{W}+\frac{R_1}{A};$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

3. a kind of transformer station as claimed in claim 1 single span suspention cast bus bar model selection method for arranging, is characterized in that, described step In rapid four, calculate stress suffered by tube type bus under deadweight and icing effect method particularly includes:

(4-21) the spaning middle section moment M corresponding to computer tube deadweight_Gz；Calculate the spaning middle section corresponding to gravity of downlead Moment M_jz；Calculate spaning middle section moment M corresponding during ice load_bz；The span centre corresponding to wind speed when calculating icing cuts Face moment M_bfz；

(4-22) according to the section turn moment of above-mentioned calculating synthesize spaning middle section moment M '₁；

$M_1^{\′}=\sqrt{M_{bfz}^2+(M_{Gz}^2+M_{jz}^2+M_{bz}^2)}$

(4-23) the pulling force R of tube type bus is calculated₂；

$R_2=\frac{h}{v}(PG+PC)$

H is the insulator chain projected length along tube type bus axis；V is the vertical projected length of insulator chain；PG is tube type bus The half of upper all vertical loads；PC is the gravity of insulator chain；

(4-24) according to the pulling force R of tube type bus₂With synthesis spaning middle section moment M '₁Calculate stress σ '₁；

${{\mathrm{\σ}}^{\′}}_1=\frac{{M_1}^{\′}}{W}+\frac{R_2}{A};$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

4. a kind of transformer station as claimed in claim 1 single span suspention cast bus bar model selection method for arranging, is characterized in that, described step In rapid four, stress suffered by tube type bus when calculating short circuit method particularly includes:

(4-31) the spaning middle section moment M corresponding to computer tube deadweight_Gz；Calculate the spaning middle section corresponding to gravity of downlead Moment M_jz；Calculate spaning middle section moment M corresponding during short circuit_dz；Calculate the spaning middle section corresponding to 50% maximum wind velocity curved Square M_50%fz；

(4-32) spaning middle section moment M is synthesized according to the section turn moment of above-mentioned calculating "₁；

${M_1}^{\′\′}=\sqrt{(M_{dz}^2+M_{50\%fz}^2)+(M_{Gz}^2+M_{jz}^2)}$

(4-33) the pulling force R of tube type bus is calculated₃；

$R_3=\frac{h}{v}(PG+PC)$

(4-34) according to the pulling force R of tube type bus₃With synthesis spaning middle section moment M "₁Calculate stress σ "₁；

${{\mathrm{\σ}}^{\′\′}}_1=\frac{{M_1}^{\′\′}}{W}+\frac{R_3}{A};$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

5. a kind of transformer station as claimed in claim 2 single span suspention cast bus bar model selection method for arranging, is characterized in that, described step In rapid four, stress suffered by tube type bus when calculating earthquake method particularly includes:

(4-41) the spaning middle section moment M corresponding to computer tube deadweight_Gz；

Calculate the spaning middle section moment M corresponding to gravity of downlead_jz；

Calculate spaning middle section moment M corresponding during earthquake_ez；

Calculate the spaning middle section moment M corresponding to 25% maximum wind velocity_25%fz；

(4-42) spaning middle section moment M is synthesized according to the section turn moment of above-mentioned calculating " '₁；

${M_1}^{\′\′\′}=\sqrt{(M_{ez}^2+M_{25\%fz}^2)+(M_{Gz}^2+M_{jz}^2)}$

(4-43) the pulling force R of tube type bus is calculated₄；

R₄=R₁+R_V

R in formula_VFor the pulling force under Vertical Earthquake Loads；

(4-44) according to the pulling force R of tube type bus₄With synthesis spaning middle section moment M " '₁Calculate stress σ " '₁；

${{\mathrm{\σ}}^{\′\′\′}}_1=\frac{{M_1}^{\′\′\′}}{W}+\frac{R_4}{A};$

Wherein, W is the section factor of tube type bus；A is the area of section of tube type bus.

6. any one the transformer station's single span suspention cast bus bar model selection method for arranging as described in claim 2-5, is characterized in that, institute State the spaning middle section moment M corresponding to computer tube deadweight_GzMethod be:

$M_{Gz}=q(\frac{l^2}{8}-\frac{c^2}{2})$

Wherein, q is the gravity of tube type bus line unit length；L is the distance between tube type bus two hitch point；C is hitch point And the distance between tube type bus thread end.

7. any one the transformer station's single span suspention cast bus bar model selection method for arranging as described in claim 2-5, is characterized in that, institute State the spaning middle section moment M corresponding to gravity calculating downlead_jzMethod particularly includes:

$M_{jz}=\frac{G_{p}l}{4}+\frac{G_W(l-2s)}{4}-\frac{{\mathrm{scG}}_W}{l+2c}$

Wherein, G_P、G_WIt is the gravity of two downleads respectively；S is the distance between two downleads, and q is that tube type bus unit is long The gravity of degree；L is the distance between tube type bus two hitch point；C is the distance between hitch point and tube type bus thread end.