CN103219710A - Assessment method for 35/0.4kV rection station area protection equipment selection - Google Patents
Assessment method for 35/0.4kV rection station area protection equipment selection Download PDFInfo
- Publication number
- CN103219710A CN103219710A CN2013100989813A CN201310098981A CN103219710A CN 103219710 A CN103219710 A CN 103219710A CN 2013100989813 A CN2013100989813 A CN 2013100989813A CN 201310098981 A CN201310098981 A CN 201310098981A CN 103219710 A CN103219710 A CN 103219710A
- Authority
- CN
- China
- Prior art keywords
- protection
- fuse
- platform district
- lectotype selection
- directly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to the field of 35kV power distribution construction, in particular to an assessment method for 35/0.4kV rection station area protection equipment selection. The method comprises the following steps of: (1) confirming influencing factors of 35/0.4kV rection station area protection equipment selection in the 35kV power distribution construction; (2) providing a 35/0.4kV rection station area fuse wire sectionalized protection scheme; (3) confirming weights of the influencing factors of 35/0.4kV rection station area protection equipment selection, and establishing an analytic hierarchy process assessment model; (4) assessing 35/0.4kV rection station area protection equipment selection based on integration of power supply-power grid-load; and (5) completing the 35/0.4kV rection station area protection equipment selection. According to the assessment method for the 35/0.4kV rection station area protection equipment selection, the problem of contradictoriness of reliability and economical efficiency of the 35/0.4kV rection station area protection configuration in 35kV power distribution can be solved, and the reliability and economical efficiency of power supply in the 35kV power distribution construction can be effectively improved.
Description
Technical field
The present invention relates to 35kV distribution construction field, be specifically related to the appraisal procedure that a kind of 35/0.4kV directly joins the protection lectotype selection of platform district.
Background technology
Geographical position, some areas is comparatively remote, economic development is slow, the electric network source deficiency of layouting, or have the circuitous power supply of 10kV circuit, cause radius of electricity supply long, line loss is big, cause circuit resident along the line can't electricity consumption or supply power voltage on the low side, have a strong impact on resident's normal production and living.The construction of 35kV distribution is meant that the 35kV electrical network adopts the construction of 10kV power distribution network standard, be mainly used to solve these regional powerup issues, crack difficult problems such as conventional power grid construction addressing difficulty, cost height, long construction period, 35/0.4kV directly joining the platform district is meant the 35kV circuit is extended to load center, adopting the directly power distribution station of power supply (be called for short and directly join the platform district) of 35/0.4kV distribution transformer, is the important component part of 35kV distribution construction.
At present, conventional 35/0.4kV directly joins the platform district and is applied to oil field and mining area on a small quantity, and the 35kV side mainly adopts circuit breaker-isolating switch mode, on-load switch-fuse, and the 0.4kV side adopts the low-voltage circuit breaker protection.This class protection equipment is applicable to that load fluctuation is bigger; the demanding responsible consumer of power supply reliability; but because the undue equipment self function (protective relaying device) that relies on; the protection lectotype selection does not have the system evaluation scheme; and increase considerably the power grid construction cost, can not be widely used in power grid construction from far-off regions.
Summary of the invention
At the deficiencies in the prior art; the purpose of this invention is to provide the appraisal procedure that a kind of 35/0.4kV directly joins the protection lectotype selection of platform district; the present invention can solve in the 35kV distributionization 35/0.4kV and directly join platform district protection configuration reliability and economy contradiction problem, can effectively improve the power supply reliability and the economy of the construction of 35kV distribution.
The objective of the invention is to adopt following technical proposals to realize:
A kind of 35/0.4kV directly joins the appraisal procedure of platform district protection lectotype selection, and its improvements are that described method defines the optimum protection lectotype selection in different application zone, and described method comprises the steps:
(1) determines that 35/0.4kV directly joins the influencing factor that the platform district protects lectotype selection in the construction of 35kV distribution;
(2) propose 35/0.4kV and directly join platform district fuse sectionalised protection scheme;
(3) determine that 35/0.4kV directly joins the weight of platform district protection lectotype selection influencing factor, sets up the analytic hierarchy process (AHP) assessment models;
(4) assess based on the integrated type selecting that 35/0.4kV is directly joined platform district protection equipment of power supply-electrical network-load;
(5) finish 35/0.4kV and directly join the protection lectotype selection of platform district.
Preferably, in the described step (1), influence factor that 35/0.4kV in the construction of 35kV distribution directly joins the protection configuration of platform district and comprise influence, environmental condition and part throttle characteristics higher level's electrical network;
Described influence to higher level's electrical network comprises transformer capacity, electric network composition and short circuit current;
Described environmental condition comprises ambient temperature, height above sea level and gradation for surface pollution;
Described part throttle characteristics comprises load character and load priority.
Preferably, described step (2) comprising: in conjunction with existing protection lectotype selection scheme, provide 35/0.4kV directly to join the collocation method that 35kV side in platform district adopts the fuse sectionalised protection, make up by insertion fuse and backup fuse and realize that 35/0.4kV directly joins the protection configuration of platform district; Determine that 35/0.4kV directly joins platform district protection lectotype selection scheme;
Described existing protection lectotype selection scheme comprises: circuit breaker-isolating switch combination, on-load switch-fuse combination and fuse switch.
More preferably, by analyzing fuse protected ampere-time characteristic, determine 35kV side fuse arrangement scheme.
More preferably, described 35/0.4kV directly joins platform district protection lectotype selection scheme and comprises:
A) the 35kV side adopts circuit breaker-isolating switch, and the 0.4kV side adopts breaker of plastic casing;
B) the 35kV side adopts on-load switch-fuse, and the 0.4kV side adopts breaker of plastic casing;
C) the 35kV side adopts fuse switch, and the 0.4kV side adopts breaker of plastic casing;
D) the 35kV side adopts and inserts fuse-backup fuse, and the 0.4kV side adopts breaker of plastic casing.
More preferably, the multiple operating condition and the fault type (operating condition comprises normal operating condition, overcurrent, overload, three-phase current unbalance) of directly joining platform district high and low pressure side at 35/0.4kV, that guarantees high-tension fuse fuse can be correct under normal operation or failure condition cut-offs, and determines to be applicable to that 35/0.4kV directly joins the type selecting principle of platform district fuse.
More preferably, the described 35/0.4kV of the being applicable to type selecting principle of directly joining platform district fuse comprises:
Insert fuse blows when A, step down side short circuit, backup fuse fusing during the transformer internal short-circuit;
B, satisfy transformer excitation flow (being about 12 times of transformer high-voltage side rated current), guarantee to insert in the 0.1s fuse and be failure to actuate;
C, satisfy transformer overload (3 times of transformer high-voltage side rated current), guarantee to insert in the 30s fuse and be failure to actuate;
D, to satisfy step down side three-phase shortcircuit electric current be 22 times of high-pressure side rated current (normal calculated value are 17～25 times of rated current, limited by transformer short-circuit impedance and system short circuit capacity), and backup fuse is failure to actuate;
E, crosspoint I
Cross≤ 2.5kA satisfies the insertion fuse and cut-offs capacity (the insertion fuse cut-offs capacity and is generally less than 2.5kA);
When F, transformer normally moved, the high-pressure side rated current should not have intersection point with insertion fuse blows curve, and guaranteeing to insert when transformer normally moves fuse does not have damage.
More preferably, being applicable to that type selecting principle that 35/0.4kV directly joins platform district fuse comprises analyzes the reason that causes low pressure feeder switch overstep tripping, with reference to low tension switch protection allocation plan (long delay protection, short time delay protection, instantaneous protection), adjust the low pressure trip device 9,35/0.4kV as claimed in claim 7 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that the low pressure main switch should dispose the electronic trip unit that has long delay, short time delay defencive function at least; The low pressure feeder switch should configuration has the electronic trip unit of long delay, instantaneous protection function at least.
Preferably, described step (3) is on the basis of step (1) and step (2), draws in conjunction with three quasi-representative application regions (three kinds of application regions refer to the Inner Mongol, the Northwest and remote districts), comprises the steps:
1. the significance level of analyzing each influencing factor sorts;
2. construct fuzzy judgment matrix, the quantitative analysis influencing factor; (short-circuit current value is according to actual condition, by the artificial foundation of setting given weight of expertise)
Wherein, the calculation of short-circuit current formula is as follows: calculation of parameter and 35/0.4kV according to higher level's transformer directly join the distance calculation short circuit current I of platform offset from higher level's transformer
(a):
Wherein:
S
1: the primary side capacity of short circuit, unit is MVA; S
e: higher level's transformer rated capacity, unit is MVA; I
1: primary side short circuit current, unit are kA; U
1: primary side voltage, unit are kV;
U
2: secondary side voltage, unit are kV; U
k%: transformer impedance percentage; Z
1: system impedance, unit is Ω; Z
t: transformer impedance, unit are Ω; R
0: unit line resistance, unit are Ω; X
0: the unit line reactance, unit is Ω; L: short dot is to the transformer distance, and unit is km; Z
a: the short dot impedance, unit is Ω;
3. set up level analytic approach assessment models, provide optimal case by higher level's analytic hierarchy process (AHP), subordinate's analytic hierarchy process (AHP) is assessed optimal case.
More preferably, the computational methods of short circuit current are directly joined the foundation of protection lectotype selection of Tai Qu high-pressure side and protection fixed value adjusting as 35/0.4kV in the 35kV distributionization.
Preferably; in the described step (4); according to influence, environmental condition, part throttle characteristics to last level power supply; the protection configuration of directly joining platform district high and low pressure side at 35/0.4kV; binding hierarchy analytic approach assessment models; carry out the integrated protection assessment of power supply-electrical network-load, select optimal sequencing, optimize the optimum protection allocation plan under the different application zone.
Preferably, described step (5) comprising: adjust 35/0.4kV according to assessment result and directly join the protection lectotype selection of platform district; Form 35/0.4kV at last and directly join the protection lectotype selection explanation of platform district, protection equipment operation curve, equipment protection schematic diagram.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
(1) provided by the inventionly is applicable under the different application condition that it is on the basis of 35kV distribution construction mode that 35/0.4kV directly joins platform district protection equipment; adopt the configuration mode of fuse segmentation; realized that 35/0.4kV directly joins the protection configuration of Tai Qu high-pressure side; under the prerequisite that guarantees the power grid security reliability service, improved the Technological Economy of 35kV distribution construction.
(2) protection equipment configuration scheme provided by the invention is by analysing in depth operating condition and the fault type that 35/0.4kV directly joins the platform district; insertion fuse and backup fuse protection range have been defined; design low tension switch and prevented overstep tripping protection configuration; realized that 35/0.4kV directly joins multipleization of platform district protection, has effectively improved the mains supply reliability.
(3) appraisal procedure of protection lectotype selection provided by the invention is directly joined on the basis of platform district protection configuration affects factor at 35/0.4kV; combine the power supply area characteristics of 35kV distributionization; set up the analytic hierarchy process (AHP) assessment models, increased 35/0.4kV and directly joined science and the practicality that the platform district protects lectotype selection.
(4) appraisal procedure of protection lectotype selection provided by the invention is being taken all factors into consideration reliability, economy and the fail safe that 35/0.4kV directly joins the platform district; 35/0.4kV in conjunction with the different application zone directly joins platform district protection equipment typical case type selecting scheme; adopt the power supply-electrical network-incorporate appraisal procedure of loading; realized that 35/0.4kV directly joins the optimization of platform district protection lectotype selection; effectively improve the mains supply reliability, increased the range of application that 35/0.4kV directly joins the platform district.
Description of drawings
Fig. 1 be insertion fuse provided by the invention and backup fuse ampere-second registration property;
Fig. 2 is that 35/0.4kV provided by the invention directly joins platform district protection lectotype selection appraisal procedure schematic flow sheet;
Fig. 3 is the schematic flow sheet that 35/0.4kV provided by the invention directly joins platform district fuse sectionalised protection.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
The 35/0.4kV that the invention provides the construction of a kind of 35kV of being applicable to distribution directly joins the appraisal procedure of platform district protection lectotype selection.This method comprises two parts: 1, propose a kind of fuse sectionalised protection scheme; 2, by power supply-electrical network-load is integrated kinds of protect lectotype selection scheme is assessed.Determine that at first 35/0.4kV directly joins the influencing factor set of platform district protection lectotype selection; Analyze the ampere-time characteristic of fuse, propose to adopt the coordinated scheme of fuse sectionalised protection; The 35kV side realizes that by adopting the combination of inserting fuse and backup fuse the 0.4kV side adopts the collocation method that prevents low pressure main switch overstep tripping; Form 35/0.4kV and directly join platform district protection equipment typical case type selecting scheme; set up the analytic hierarchy process (AHP) assessment models; 35/0.4kV is directly joined platform district Global Macros lectotype selection scheme assess based on net lotus in source is integrated, optimize 35/0.4kV and directly join platform district protection lectotype selection scheme.The present invention can solve in the 35kV distributionization 35/0.4kV and directly join platform district protection configuration reliability and economy contradiction problem, can effectively improve the power supply reliability and the economy of the construction of 35kV distribution.
The appraisal procedure flow process that the 35kV of being used for distribution 35/0.4kV provided by the invention directly joins platform district protection lectotype selection has defined the optimum protection lectotype selection in different application zone as shown in Figure 2, and described method comprises the steps:
(1) determines that 35/0.4kV directly joins the influencing factor that the platform district protects equipment in the construction of 35kV distribution;
Described step (1) comprising: on the basis of 35kV distribution construction mode, in conjunction with the influencing factor of conventional electric network protection configuration, determine that 35/0.4kV directly joins the factor that lectotype selection is protected in the influence of platform district under the different application condition; Influencing factor comprises the influence of higher level's electrical network, part throttle characteristics and environmental condition.
Wherein, the influence to higher level's electrical network comprises transformer capacity, electric network composition, short circuit current;
Wherein, environmental condition comprises ambient temperature, height above sea level, gradation for surface pollution;
Wherein, part throttle characteristics comprises load character, load priority level.
(2), propose 35/0.4kV and directly join platform district fuse sectionalised protection scheme in conjunction with conventional protection lectotype selection scheme;
Described step (2) comprising: in conjunction with conventional protection lectotype selection scheme, propose a kind of 35/0.4kV and directly join the scheme that 35kV side in platform district adopts the fuse sectionalised protection, analyze the ampere-time characteristic between the fuse, design 35kV side fuse arrangement scheme.Analysis causes the reason of low pressure feeder switch overstep tripping, with reference to conventional low tension switch protection collocation method, adjusts the conventional setting value of low pressure trip device; At the part throttle characteristics of remote districts, determine to prevent that the low pressure main switch from preventing low pressure overstep tripping collocation method.In conjunction with existing several protection equipment (circuit breaker-isolating switch, on-load switch-fuse, fuse switch), sum up the configured in one piece scheme that suitable 35/0.4kV directly joins the platform district.The flow process that 35/0.4kV provided by the invention directly joins platform district fuse sectionalised protection as shown in Figure 3.
Wherein, fuse sectionalised protection scheme is to realize by inserting the combination of fuse and backup fuse.
Wherein, the Global Macros allocation plan that suitable 35/0.4kV directly joins the platform district mainly is: the 35kV side adopts isolating switch-fuse, on-load switch-fuse, fuse switch, and the 0.4kV side adopts and prevents low pressure main switch overstep tripping protection configuration.
(3), determine that 35/0.4kV directly joins the weight of platform district protection lectotype selection influencing factor, sets up the analytic hierarchy process (AHP) assessment models at the different application zone;
Described step (3) comprising: on the basis of step (2), the multiple operating condition and the fault type of directly joining platform district high and low pressure side at 35/0.4kV, guarantee that high-tension fuse fuse under normal operation or failure condition can correctly selectively cut-off, and determines to be applicable to that 35/0.4kV directly joins the type selecting principle of platform district fuse.
Insertion fuse provided by the invention and backup fuse ampere-second registration property as shown in Figure 1:
Wherein, the type selecting principle of fuse:
Insert fuse blows when A, step down side short circuit, backup fuse fusing during the transformer internal short-circuit;
B, satisfy transformer excitation flow (being about 12 times of transformer high-voltage side rated current), guarantee to insert in the 0.1s fuse and be failure to actuate;
C, satisfy transformer overload (3 times of transformer high-voltage side rated current), guarantee to insert in the 30s fuse and be failure to actuate;
D, to satisfy step down side three-phase shortcircuit electric current be 22 times of high-pressure side rated current (normal calculated value are 17～25 times of rated current, limited by transformer short-circuit impedance and system short circuit capacity), and backup fuse is failure to actuate;
E, crosspoint I
Cross≤ 2.5kA satisfies the insertion fuse and cut-offs capacity (the insertion fuse cut-offs capacity and is generally less than 2.5kA);
When F, transformer normally moved, the high-pressure side rated current should not have intersection point with insertion fuse blows curve, and guaranteeing to insert when transformer normally moves fuse does not have damage;
Influencing factor in the step (1) is carried out layering to be handled according to the typical application region in the construction of 35kV distribution, to the influencing factor processing of sorting, the structure judgment matrix, set up the analytic hierarchy process (AHP) assessment models, provide optimal case by higher level's analytic hierarchy process (AHP), subordinate's analytic hierarchy process (AHP) is assessed optimal case.
Step (3) draws in conjunction with three quasi-representative application regions (three kinds of application regions refer to the Inner Mongol, the Northwest and remote districts) on the basis of step (1) and step (2), specifically comprises the steps:
1. the significance level of analyzing each influencing factor sorts;
2. construct fuzzy judgment matrix, the quantitative analysis influencing factor; (short-circuit current value is according to actual condition, by the artificial foundation of setting given weight of expertise)
Wherein, the calculation of short-circuit current formula is as follows: calculation of parameter and 35/0.4kV according to higher level's transformer directly join the distance calculation short circuit current I of platform offset from higher level's transformer
(a):
Wherein:
S
1: the primary side capacity of short circuit, unit is MVA; S
e: higher level's transformer rated capacity, unit is MVA; I
1: primary side short circuit current, unit are kA; U
1: primary side voltage, unit are kV;
U
2: secondary side voltage, unit are kV; U
k%: transformer impedance percentage; Z
1: system impedance, unit is Ω; Z
t: transformer impedance, unit are Ω; R
0: unit line resistance, unit are Ω; X
0: the unit line reactance, unit is Ω; L: short dot is to the transformer distance, and unit is km; Z
a: the short dot impedance, unit is Ω;
3. set up level analytic approach assessment models, provide optimal case by higher level's analytic hierarchy process (AHP), subordinate's analytic hierarchy process (AHP) is assessed optimal case.
The computational methods of short circuit current are directly joined the foundation of protection lectotype selection of Tai Qu high-pressure side and protection fixed value adjusting as 35/0.4kV in the 35kV distributionization.
Wherein, three kinds of typical application regions that 35/0.4kV directly joins the platform district in the construction of 35kV distribution comprise:
A. higher level's transformer capacity is 63000kVA, and level power supply is very near on the distance, is approximately 1km～5km, and height above sea level is less than 2000m, minimum temperature-40 ℃, and aggregation resident load, gradation for surface pollution is the I level, this meteorological condition is applicable to area, the Inner Mongol;
B. higher level's transformer capacity is 63000kVA, and level power supply is far away on the distance, is approximately 20km～50km, and height above sea level is greater than 2000m-4500m, and minimum temperature-30 ℃ is disperseed resident's load, and gradation for surface pollution is the II level, and this meteorological condition is applicable to the high altitude localities, northwest;
C. higher level's transformer capacity is 180000kVA, and level power supply is nearer on the distance, is approximately 5km～20km, and height above sea level is greater than less than 2000m, minimum temperature-20 ℃, and industrial load, gradation for surface pollution are the III level, this meteorological condition is applicable to the part remote districts.
(4) assess based on the integrated type selecting that 35/0.4kV is directly joined platform district protection equipment of power supply-electrical network-load;
Described step (4) comprising: the type selecting scheme of the 35/0.4kV in the step (2) directly being joined platform district protection equipment is carried out the power supply-electrical network-integrated comprehensive assessment of loading under the application region in step (3); in conjunction with reliability, economy and safety evaluatio index, draw and optimize optimum protection allocation plan under the different application zone.
The reliability evaluation index comprises: but automatic recovery of power supply and failure rate; The economy evaluation index comprises: equipment cost and operation and maintenance expenses are used; But the safety evaluatio index comprises obvious breaking point and maximum drop-out current.
Wherein, 35/0.4kV directly joins the type selecting scheme of platform district protection equipment:
A) the 35kV side adopts circuit breaker-isolating switch, and the 0.4kV side adopts breaker of plastic casing;
B) the 35kV side adopts on-load switch-fuse, and the 0.4kV side adopts breaker of plastic casing;
C) the 35kV side adopts fuse switch, and the 0.4kV side adopts breaker of plastic casing;
D) the 35kV side adopts and inserts fuse-backup fuse, and the 0.4kV side adopts breaker of plastic casing;
Wherein, power supply refers to big electrical network, distributed power source.
(5) finish 35/0.4kV and directly join the protection lectotype selection of platform district.On the basis of step (1)-(4), at every kind of typical application region, select 35/0.4kV directly to join platform district optimum protection lectotype selection scheme, form protection lectotype selection explanation, protection equipment operation curve, equipment protection schematic diagram.
The weight of reliability and economy is to get (also being the set point according to expertise) according to subordinate's level method analysis in the appraisal procedure of this paper; on this basis; select optimum protection equipment disposition; realized that 35/0.4kV directly joins the optimization of platform district protection lectotype selection; effectively improve the mains supply reliability, increased the range of application that 35/0.4kV directly joins the platform district.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (12)
1. a 35/0.4kV directly joins the appraisal procedure that the platform district protects lectotype selection, it is characterized in that, described method defines the optimum protection lectotype selection in different application zone, and described method comprises the steps:
(1) determines that 35/0.4kV directly joins the influencing factor that the platform district protects lectotype selection in the construction of 35kV distribution;
(2) propose 35/0.4kV and directly join platform district fuse sectionalised protection scheme;
(3) determine that 35/0.4kV directly joins the weight of platform district protection lectotype selection influencing factor, sets up the analytic hierarchy process (AHP) assessment models;
(4) assess based on the integrated type selecting that 35/0.4kV is directly joined platform district protection equipment of power supply-electrical network-load;
(5) finish 35/0.4kV and directly join the protection lectotype selection of platform district.
2. 35/0.4kV as claimed in claim 1 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that, in the described step (1), influence factor that 35/0.4kV in the construction of 35kV distribution directly joins the protection configuration of platform district and comprise influence, environmental condition and part throttle characteristics higher level's electrical network;
Described influence to higher level's electrical network comprises transformer capacity, electric network composition and short circuit current;
Described environmental condition comprises ambient temperature, height above sea level and gradation for surface pollution;
Described part throttle characteristics comprises load character and load priority.
3. 35/0.4kV as claimed in claim 1 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that, described step (2) comprising: in conjunction with existing protection lectotype selection scheme, provide 35/0.4kV directly to join the collocation method that 35kV side in platform district adopts the fuse sectionalised protection, make up by insertion fuse and backup fuse and realize that 35/0.4kV directly joins the protection configuration of platform district; Determine that 35/0.4kV directly joins platform district protection lectotype selection scheme;
Described existing protection lectotype selection scheme comprises: circuit breaker-isolating switch combination, on-load switch-fuse combination and fuse switch.
4. 35/0.4kV as claimed in claim 3 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that, by analyzing fuse protected ampere-time characteristic, determines 35kV side fuse arrangement scheme.
5. 35/0.4kV as claimed in claim 3 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that, described 35/0.4kV directly joins platform district protection lectotype selection scheme and comprises:
A) the 35kV side adopts circuit breaker-isolating switch, and the 0.4kV side adopts breaker of plastic casing;
B) the 35kV side adopts on-load switch-fuse, and the 0.4kV side adopts breaker of plastic casing;
C) the 35kV side adopts fuse switch, and the 0.4kV side adopts breaker of plastic casing;
D) the 35kV side adopts and inserts fuse-backup fuse, and the 0.4kV side adopts breaker of plastic casing.
6. 35/0.4kV as claimed in claim 5 directly joins the appraisal procedure of platform district protection lectotype selection; it is characterized in that; the multiple operating condition and the fault type of directly joining platform district high and low pressure side at 35/0.4kV; that guarantees high-tension fuse fuse can be correct under normal operation or failure condition cut-offs, and determines to be applicable to that 35/0.4kV directly joins the type selecting principle of platform district fuse.
7. 35/0.4kV as claimed in claim 6 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that the type selecting principle that the described 35/0.4kV of being applicable to directly joins platform district fuse comprises:
Insert fuse blows when A, step down side short circuit, backup fuse fusing during the transformer internal short-circuit;
B, satisfy transformer excitation flow, guarantee to insert in the 0.1s fuse and be failure to actuate;
C, satisfy the transformer overload, guarantee to insert in the 30s fuse and be failure to actuate;
D, to satisfy step down side three-phase shortcircuit electric current be 22 times of high-pressure side rated current, and backup fuse is failure to actuate;
E, crosspoint I
Cross≤ 2.5kA satisfies the insertion fuse and cut-offs capacity;
When F, transformer normally moved, the high-pressure side rated current should not have intersection point with insertion fuse blows curve, and guaranteeing to insert when transformer normally moves fuse does not have damage.
8. 35/0.4kV as claimed in claim 6 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that, being applicable to that type selecting principle that 35/0.4kV directly joins platform district fuse comprises analyzes the reason that causes low pressure feeder switch overstep tripping, with reference to low tension switch protection allocation plan, adjust the low pressure trip device 9,35/0.4kV as claimed in claim 7 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that the low pressure main switch should dispose the electronic trip unit that has long delay, short time delay defencive function at least; The low pressure feeder switch should configuration has the electronic trip unit of long delay, instantaneous protection function at least.
9. 35/0.4kV as claimed in claim 1 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that described step (3) is on the basis of step (1) and step (2), draws in conjunction with three quasi-representative application regions, comprises the steps:
1. the significance level of analyzing each influencing factor sorts;
2. construct fuzzy judgment matrix, the quantitative analysis influencing factor;
Wherein, the calculation of short-circuit current formula is as follows: calculation of parameter and 35/0.4kV according to higher level's transformer directly join the distance calculation short circuit current I of platform offset from higher level's transformer
(a):
Wherein:
S
1: the primary side capacity of short circuit, unit is MVA; S
e: higher level's transformer rated capacity, unit is MVA; I
1: primary side short circuit current, unit are kA; U
1: primary side voltage, unit are kV;
U
2: secondary side voltage, unit are kV; U
k%: transformer impedance percentage; Z
1: system impedance, unit is Ω; Z
t: transformer impedance, unit are Ω; R
0: unit line resistance, unit are Ω; X
0: the unit line reactance, unit is Ω; L: short dot is to the transformer distance, and unit is km; Z
a: the short dot impedance, unit is Ω;
3. set up level analytic approach assessment models, provide optimal case by higher level's analytic hierarchy process (AHP), subordinate's analytic hierarchy process (AHP) is assessed optimal case.
10. 35/0.4kV as claimed in claim 9 directly joins the appraisal procedure of platform district protection lectotype selection; it is characterized in that the computational methods of short circuit current are directly joined the foundation of protection lectotype selection of Tai Qu high-pressure side and protection fixed value adjusting as 35/0.4kV in the 35kV distributionization.
11. 35/0.4kV as claimed in claim 1 directly joins the appraisal procedure of platform district protection lectotype selection; it is characterized in that; in the described step (4); according to influence, environmental condition, part throttle characteristics to last level power supply; directly join the protection of platform district high and low pressure side at 35/0.4kV and dispose, binding hierarchy analytic approach assessment models is carried out the integrated protection assessment of power supply-electrical network-load; select optimal sequencing, optimize the optimum protection allocation plan under the different application zone.
12. 35/0.4kV as claimed in claim 1 directly joins the appraisal procedure of platform district protection lectotype selection, it is characterized in that described step (5) comprising: adjust 35/0.4kV according to assessment result and directly join the protection lectotype selection of platform district; Form 35/0.4kV at last and directly join the protection lectotype selection explanation of platform district, protection equipment operation curve, equipment protection schematic diagram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310098981.3A CN103219710B (en) | 2013-03-26 | 2013-03-26 | The appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310098981.3A CN103219710B (en) | 2013-03-26 | 2013-03-26 | The appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103219710A true CN103219710A (en) | 2013-07-24 |
| CN103219710B CN103219710B (en) | 2015-12-02 |
Family
ID=48817294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310098981.3A Active CN103219710B (en) | 2013-03-26 | 2013-03-26 | The appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103219710B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104765933A (en) * | 2015-04-23 | 2015-07-08 | 国家电网公司 | Method for implementing intelligent layering of wiring diagram of distribution area |
| CN103824231B (en) * | 2014-02-25 | 2016-08-17 | 国家电网公司 | A kind of wind energy turbine set transformator selection method considering wind power distribution characteristics |
| CN110322076A (en) * | 2019-07-10 | 2019-10-11 | 云南电网有限责任公司电力科学研究院 | A kind of medium-voltage line fault treatment lectotype selection standard base construction method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5644238A (en) * | 1995-06-07 | 1997-07-01 | Seifert; Gregory J. | Method and apparatus for comparing load current in an electrical circuit with the capacity of its supply source |
| CN102013679A (en) * | 2010-11-24 | 2011-04-13 | 中国电力科学研究院 | Method for analyzing influence on power grid after large-scale wind power central integration |
| CN102611100A (en) * | 2012-03-02 | 2012-07-25 | 中国电力科学研究院 | Power system planning method suitable for power supply in remote area |
-
2013
- 2013-03-26 CN CN201310098981.3A patent/CN103219710B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5644238A (en) * | 1995-06-07 | 1997-07-01 | Seifert; Gregory J. | Method and apparatus for comparing load current in an electrical circuit with the capacity of its supply source |
| CN102013679A (en) * | 2010-11-24 | 2011-04-13 | 中国电力科学研究院 | Method for analyzing influence on power grid after large-scale wind power central integration |
| CN102611100A (en) * | 2012-03-02 | 2012-07-25 | 中国电力科学研究院 | Power system planning method suitable for power supply in remote area |
Non-Patent Citations (2)
| Title |
|---|
| 宋海生等: "35kV智能配电化建设及应用", 《青海电力》, vol. 31, 31 December 2012 (2012-12-31) * |
| 詹涛等: "35kV变电站配电化应用", 《农村电气化》, no. 2, 28 February 2011 (2011-02-28) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103824231B (en) * | 2014-02-25 | 2016-08-17 | 国家电网公司 | A kind of wind energy turbine set transformator selection method considering wind power distribution characteristics |
| CN104765933A (en) * | 2015-04-23 | 2015-07-08 | 国家电网公司 | Method for implementing intelligent layering of wiring diagram of distribution area |
| CN104765933B (en) * | 2015-04-23 | 2017-09-05 | 国家电网公司 | The implementation method that a kind of power distribution station wiring diagram is intelligently layered |
| CN110322076A (en) * | 2019-07-10 | 2019-10-11 | 云南电网有限责任公司电力科学研究院 | A kind of medium-voltage line fault treatment lectotype selection standard base construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103219710B (en) | 2015-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103001235B (en) | Method for evaluating risks of MOV (metal oxide varistor) of series capacitive compensator | |
| CN105140897A (en) | Protection method suitable for low resistance grounding system single phase grounding fault | |
| CN104124783A (en) | Electricity fetching device based on electric transmission line aerial thunder prevention ground wires | |
| CN101304170A (en) | System debug method for high voltage direct current transmission project | |
| CN201145735Y (en) | Device for testing electric leakage circuit breaker | |
| CN103296650B (en) | Based on Sudden Changing Rate differential factor matrix UHV transmission line relay protecting method | |
| CN102073795A (en) | 110kV cable hybrid line switching overvoltage level prediction method | |
| CN104377642A (en) | Method for setting reclosing time on basis of secondary arc currents and recovery voltages | |
| CN103427354A (en) | Early determination method for substation grounding grid | |
| CN103219710B (en) | The appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection | |
| Key et al. | On good behavior: Inverter-grid protections for integrating distributed photovoltaics | |
| Das | Short-Circuits in AC and DC Systems: ANSI, IEEE, and IEC Standards | |
| CN103344853A (en) | Method for judging faults of parallel capacitors by means of natural vibration frequency | |
| CN206848403U (en) | A kind of four machine Parallel test loops | |
| CN103728517B (en) | Correcting algorithm for transformer state assessment by considering poor working conditions | |
| Tu’uau et al. | Electric power system fault analysis | |
| CN209119803U (en) | Uninterrupted power supply Intelligent over voltage protective device | |
| CN107834544A (en) | A kind of neutral grounding in distribution power network remodeling method theoretical based on interval number | |
| CN203301223U (en) | Rapid power supply switching device | |
| CN108388725B (en) | Urban distribution network grounding line selection auxiliary decision-making system method based on expert system | |
| Khan | Improving the reliability performance of medium voltage networks | |
| CN201926745U (en) | Test circuit for asymmetric current breaking of million-voltage circuit breaker | |
| KR101133828B1 (en) | Apparstus and method for controlling the transformer in the low voltage distribution network | |
| Essl et al. | Assessing the severity of voltage sags due to short circuits in transmission and distribution grids | |
| Dong et al. | The offline accident of the large-scale wind generator system and its protection & control scheme |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |