CN103219710B - The appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection - Google Patents
The appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection Download PDFInfo
- Publication number
- CN103219710B CN103219710B CN201310098981.3A CN201310098981A CN103219710B CN 103219710 B CN103219710 B CN 103219710B CN 201310098981 A CN201310098981 A CN 201310098981A CN 103219710 B CN103219710 B CN 103219710B
- Authority
- CN
- China
- Prior art keywords
- peitai
- zhi
- district
- fuse
- protection device
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 claims abstract description 19
- 230000010354 integration Effects 0.000 claims abstract description 9
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 230000007613 environmental effect Effects 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000000205 computational method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004445 quantitative analysis Methods 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 238000012163 sequencing technique Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to 35kV distribution construction field, be specifically related to the appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection, described method comprises the steps: that (1) determines the influencing factor of 35/0.4kV Zhi Peitai district protection device selection in the construction of 35kV distributionization; (2) 35/0.4kV Zhi Peitai district fuse sectionalised protection scheme is proposed; (3) determine the weight of 35/0.4kV Zhi Peitai district protection device selection influencing factor, set up analytic hierarchy process (AHP) assessment models; (4) based on power supply-electrical network-load integration, the type selecting of 35/0.4kV Zhi Peitai district proterctive equipment is assessed; (5) 35/0.4kV Zhi Peitai district protection device selection is completed.The present invention can solve 35/0.4kV Zhi Peitai district relaying configuration reliability and economy paradox problem in 35kV distribution, effectively can improve power supply reliability and the economy of the construction of 35kV distributionization.
Description
Technical field
The present invention relates to 35kV distribution construction field, be specifically related to the appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection.
Background technology
Geographical position, some areas is comparatively remote, economic development is slow, and electric network source is layouted deficiency, or there is the roundabout power supply of 10kV circuit, cause radius of electricity supply long, line loss is large, cause circuit subjective reflection cannot electricity consumption or supply power voltage on the low side, have a strong impact on the normal productive life of resident.The construction of 35kV distribution refers to that 35kV electrical network adopts 10kV power distribution network standard working-out, be mainly used to the powerup issue solving these areas, crack normal grid and build the difficult problems such as addressing is difficult, cost is high, long construction period, 35/0.4kV Zhi Peitai district refers to and 35kV circuit is extended to load center, the power distribution station (being called for short Zhi Peitai district) adopting 35/0.4kV distribution transformer directly to power is the important component part that 35kV distributionization is built.
At present, conventional 35/0.4kV Zhi Peitai district is applied to oil field and mining area on a small quantity, and 35kV side mainly adopts circuit breaker-isolating switch mode, on-load switch-fuse, and 0.4kV side adopts low-voltage circuit breaker protection.It is larger that this kind of proterctive equipment is applicable to load fluctuation; power supply reliability requires high responsible consumer; but owing to too relying on equipment self function (protective relaying device); protection device selection does not have system evaluation scheme; and increase considerably power grid construction cost, power grid construction from far-off regions can not be widely used in.
Summary of the invention
For the deficiencies in the prior art; the object of this invention is to provide the appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection; the present invention can solve 35/0.4kV Zhi Peitai district relaying configuration reliability and economy paradox problem in 35kV distribution, effectively can improve power supply reliability and the economy of the construction of 35kV distributionization.
The object of the invention is to adopt following technical proposals to realize:
An appraisal procedure for 35/0.4kV Zhi Peitai district protection device selection, its improvements are, described method defines the optimum protection device selection in different application region, and described method comprises the steps:
(1) influencing factor of 35/0.4kV Zhi Peitai district protection device selection in the construction of 35kV distributionization is determined;
(2) 35/0.4kV Zhi Peitai district fuse sectionalised protection scheme is proposed;
(3) determine the weight of 35/0.4kV Zhi Peitai district protection device selection influencing factor, set up analytic hierarchy process (AHP) assessment models;
(4) based on power supply-electrical network-load integration, the type selecting of 35/0.4kV Zhi Peitai district proterctive equipment is assessed;
(5) 35/0.4kV Zhi Peitai district protection device selection is completed.
Preferably, in described step (1), the factor affecting 35/0.4kV Zhi Peitai district relaying configuration in the construction of 35kV distribution comprises impact on higher level's electrical network, environmental condition and part throttle characteristics;
The described impact on 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 device selection scheme, there is provided 35kV side, 35/0.4kV Zhi Peitai district to adopt the collocation method of fuse sectionalised protection, realize 35/0.4kV Zhi Peitai district relaying configuration by insertion fuse and backup fuse combination; Determine 35/0.4kV Zhi Peitai district protection device selection scheme;
Described existing protection device 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 Zhi Peitai district protection device selection scheme comprises:
A) 35kV side adopts circuit breaker-isolating switch, and 0.4kV side adopts breaker of plastic casing;
B) 35kV side adopts on-load switch-fuse, and 0.4kV side adopts breaker of plastic casing;
C) 35kV side adopts fuse switch, and 0.4kV side adopts breaker of plastic casing;
D) 35kV side adopts and inserts fuse-backup fuse, and 0.4kV side adopts breaker of plastic casing.
More preferably, for multiple operating condition and the fault type (operating condition comprises accidental conditions, overcurrent, overload, three-phase current unbalance) of 35/0.4kV Zhi Peitai district high and low pressure side, guarantee that high-tension fuse to run or under failure condition, fuse can be correct cut-offs normal, determine the Type Selection Principle being applicable to 35/0.4kV Zhi Peitai district fuse.
More preferably, the Type Selection Principle being applicable to 35/0.4kV Zhi Peitai district fuse described in comprises:
Fuse blows is inserted, backup fuse fusing during inside transformer short circuit when A, step down side short circuit;
B, meet transformer excitation flow (being about 12 times of high voltage side of transformer rated current), ensure that inserting fuse in 0.1s is failure to actuate;
C, meet transformer overload (3 times of high voltage side of transformer rated current), ensure that inserting fuse in 30s is failure to actuate;
D, to meet step down side three short circuit current be 22 times of high-pressure side rated current (normal calculated value is 17 ~ 25 times of rated current, limits by Transformer Short Circuit Impedance and system short circuit capacity), and backup fuse is failure to actuate;
E, crosspoint I
cross≤ 2.5kA, meets insertion fuse and cut-offs capacity (insertion fuse cut-offs capacity and is generally less than 2.5kA);
When F, transformer normally run, high-pressure side rated current should, with insertion fuse blows curve without intersection point, ensure to insert fuse when transformer normally runs without damage.
More preferably, the Type Selection Principle being applicable to 35/0.4kV Zhi Peitai district fuse comprises the reason analyzed and cause low pressure feeder switch overstep tripping, with reference to low tension switch relaying configuration scheme (long delay protection, short delay protection, instantaneous protection), 9 of accounting low pressure trip device, the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 7 protection device selection, it is characterized in that, low pressure main switch should configure at least with the electronic trip unit of long delay, short delay protection function; Low pressure feeder switch should configure at least with the electronic trip unit of long delay, instantaneous protection function.
Preferably, described step (3) is on the basis of step (1) and step (2), draws, comprise the steps: in conjunction with three quasi-representative application regions (three kinds of application regions refer to the Inner Mongol, the Northwest and remote districts)
1. the significance level analyzing each influencing factor sorts;
2. fuzzy judgment matrix is constructed, quantitative analysis influencing factor; (short-circuit current value is according to actual condition, is artificially set the foundation of given weight by expertise)
Wherein, calculation of short-circuit current formula is as follows: directly join platform offset according to the calculation of parameter of higher level's transformer and 35/0.4kV and calculate short circuit current I from the distance of higher level's transformer
(a):
Wherein:
S
1: 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 is kA; U
1: primary side voltage, unit is kV;
U
2: secondary side voltage, unit is kV; U
k%: transformer impedance percentage; Z
1: system impedance, unit is Ω; Z
t: transformer impedance, unit is Ω; R
0: unit line resistance, unit is Ω; X
0: unit line reactance, unit is Ω; L: short dot is to transformer distance, and unit is km; Z
a: short dot impedance, unit is Ω;
3. set up Analytic hierarchy process 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 as 35/0.4kV Zhi Peitai district high-pressure side protection device selection in 35kV distribution and the foundation protecting fixed value adjusting.
Preferably; in described step (4); according to the impact on upper level power supply, environmental condition, part throttle characteristics; for the relaying configuration of 35/0.4kV Zhi Peitai district high and low pressure side; binding hierarchy analytic approach assessment models; carry out power supply-electrical network-load integration protection assessment, select optimal sequencing, optimize the optimum relaying configuration scheme under different application region.
Preferably, described step (5) comprising: according to assessment result adjustment 35/0.4kV Zhi Peitai district protection device selection; Finally form the protection device selection explanation of 35/0.4kV Zhi Peitai district, proterctive equipment operation curve, equipment protection schematic diagram.
Compared with the prior art, the beneficial effect that the present invention reaches is:
It is (1) provided by the invention that to be applicable to 35/0.4kV Zhi Peitai district proterctive equipment under different application condition be on the basis of 35kV distribution construction mode; adopt the configuration mode of fuse segmentation; achieve 35/0.4kV Zhi Peitai district high-pressure side relaying configuration; under the prerequisite ensureing power grid security reliability service, improve the Technical Economy that 35kV distributionization is built.
(2) proterctive equipment allocation plan provided by the invention is by analysing in depth operating condition and the fault type in 35/0.4kV Zhi Peitai district; define and insert fuse and backup fuse protection range; devise low tension switch and prevent overstep tripping relaying configuration; achieve the multiplex of 35/0.4kV Zhi Peitai district protection, effectively improve mains supply reliability.
(3) appraisal procedure of protection device selection provided by the invention is on the basis of 35/0.4kV Zhi Peitai district relaying configuration influencing factor; combine the power supply area feature of 35kV distribution; establish analytic hierarchy process (AHP) assessment models, add science and the practicality of 35/0.4kV Zhi Peitai district protection device selection.
(4) appraisal procedure of protection device selection provided by the invention is considering the reliability in 35/0.4kV Zhi Peitai district, economy and fail safe; in conjunction with the 35/0.4kV Zhi Peitai district proterctive equipment typical case selecting type scheme in different application region; adopt the appraisal procedure of power supply-electrical network-load integration; achieve the optimization of 35/0.4kV Zhi Peitai district protection device selection; effectively improve mains supply reliability, add the range of application in 35/0.4kV Zhi Peitai district.
Accompanying drawing explanation
Fig. 1 be insertion fuse provided by the invention and backup fuse ampere-second registration property;
Fig. 2 is 35/0.4kV Zhi Peitai district provided by the invention protection device selection appraisal procedure schematic flow sheet;
Fig. 3 is the schematic flow sheet of 35/0.4kV Zhi Peitai district provided by the invention fuse sectionalised protection.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The invention provides a kind of appraisal procedure being applicable to the 35/0.4kV Zhi Peitai district protection device selection that 35kV distributionization is built.The method comprises two parts: 1, propose a kind of fuse sectionalised protection scheme; 2, by power supply-electrical network-load integration, multiple protection device selection scheme is assessed.First the influencing factor set of 35/0.4kV Zhi Peitai district protection device selection is determined; Analyze the ampere-time characteristic of fuse, propose the coordinated scheme adopting fuse sectionalised protection; 35kV side realizes by adopting the combination of inserting fuse and backup fuse, and 0.4kV side adopts the collocation method preventing low pressure main switch overstep tripping; Form 35/0.4kV Zhi Peitai district proterctive equipment typical case selecting type scheme; set up analytic hierarchy process (AHP) assessment models; based on the integration of source net lotus, Global Macros lectotype selection scheme in 35/0.4kV Zhi Peitai district is assessed, optimize 35/0.4kV Zhi Peitai district protection device selection scheme.The present invention can solve 35/0.4kV Zhi Peitai district relaying configuration reliability and economy paradox problem in 35kV distribution, effectively can improve power supply reliability and the economy of the construction of 35kV distributionization.
As shown in Figure 2, define the optimum protection device selection in different application region, described method comprises the steps: appraisal procedure flow process for 35/0.4kV Zhi Peitai district protection device selection in 35kV distribution provided by the invention
(1) influencing factor of 35/0.4kV Zhi Peitai district proterctive equipment in the construction of 35kV distributionization is determined;
Described step (1) comprising: on the basis of 35kV distribution construction mode, in conjunction with the influencing factor of normal grid relaying configuration, determines that 35/0.4kV Zhi Peitai district affects the factor of protection device selection under different application condition; Influencing factor comprises impact on higher level's electrical network, part throttle characteristics and environmental condition.
Wherein, transformer capacity, electric network composition, short circuit current are comprised on the impact of higher level's electrical network;
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) combine conventional protection device selection scheme, propose 35/0.4kV Zhi Peitai district fuse sectionalised protection scheme;
Described step (2) comprising: combine conventional protection device selection scheme, proposes the scheme that 35kV side, a kind of 35/0.4kV Zhi Peitai district adopts fuse sectionalised protection, analyzes the ampere-time characteristic between fuse, design 35kV side fuse arrangement scheme.Analyze the reason causing low pressure feeder switch overstep tripping, with reference to conventional low voltage switch protection collocation method, adjust the conventional setting value of low pressure trip device; For the part throttle characteristics of remote districts, determine to prevent low pressure main switch from preventing low pressure overstep tripping collocation method.In conjunction with existing several proterctive equipment (circuit breaker-isolating switch, on-load switch-fuse, fuse switch), sum up the configured in one piece scheme being applicable to 35/0.4kV Zhi Peitai district.The flow process of 35/0.4kV Zhi Peitai district provided by the invention fuse sectionalised protection as shown in Figure 3.
Wherein, fuse sectionalised protection scheme is by inserting fuse and backup fuse combination realization.
Wherein, be applicable to the Global Macros allocation plan in 35/0.4kV Zhi Peitai district mainly: 35kV side adopts isolating switch-fuse, on-load switch-fuse, fuse switch, 0.4kV side adopts and prevents low pressure main switch overstep tripping relaying configuration.
(3) for different application region, determine the weight of 35/0.4kV Zhi Peitai district protection device selection influencing factor, set up analytic hierarchy process (AHP) assessment models;
Described step (3) comprising: on the basis of step (2), for multiple operating condition and the fault type of 35/0.4kV Zhi Peitai district high and low pressure side, guarantee that high-tension fuse fuse under normal operation or failure condition can correctly selectively cut-off, determine the Type Selection Principle being applicable to 35/0.4kV Zhi Peitai district fuse.
Insertion fuse provided by the invention and backup fuse ampere-second registration property as shown in Figure 1:
Wherein, the Type Selection Principle of fuse:
Fuse blows is inserted, backup fuse fusing during inside transformer short circuit when A, step down side short circuit;
B, meet transformer excitation flow (being about 12 times of high voltage side of transformer rated current), ensure that inserting fuse in 0.1s is failure to actuate;
C, meet transformer overload (3 times of high voltage side of transformer rated current), ensure that inserting fuse in 30s is failure to actuate;
D, to meet step down side three short circuit current be 22 times of high-pressure side rated current (normal calculated value is 17 ~ 25 times of rated current, limits by Transformer Short Circuit Impedance and system short circuit capacity), and backup fuse is failure to actuate;
E, crosspoint I
cross≤ 2.5kA, meets insertion fuse and cut-offs capacity (insertion fuse cut-offs capacity and is generally less than 2.5kA);
When F, transformer normally run, high-pressure side rated current should, with insertion fuse blows curve without intersection point, ensure to insert fuse when transformer normally runs without damage;
Layered shaping is carried out according to the typical apply region in the construction of 35kV distributionization to the influencing factor in step (1), sequence process is carried out to influencing factor, Judgement Matricies, set up 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), 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), specifically comprises the steps:
1. the significance level analyzing each influencing factor sorts;
2. fuzzy judgment matrix is constructed, quantitative analysis influencing factor; (short-circuit current value is according to actual condition, is artificially set the foundation of given weight by expertise)
Wherein, calculation of short-circuit current formula is as follows: directly join platform offset according to the calculation of parameter of higher level's transformer and 35/0.4kV and calculate short circuit current I from the distance of higher level's transformer
(a):
Wherein:
S
1: 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 is kA; U
1: primary side voltage, unit is kV;
U
2: secondary side voltage, unit is kV; U
k%: transformer impedance percentage; Z
1: system impedance, unit is Ω; Z
t: transformer impedance, unit is Ω; R
0: unit line resistance, unit is Ω; X
0: unit line reactance, unit is Ω; L: short dot is to transformer distance, and unit is km; Z
a: short dot impedance, unit is Ω;
3. set up Analytic hierarchy process 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 as 35/0.4kV Zhi Peitai district high-pressure side protection device selection in 35kV distribution and the foundation protecting fixed value adjusting.
Wherein, in the construction of 35kV distribution, three kinds of typical apply regions in 35/0.4kV Zhi Peitai district comprise:
A. higher level's transformer capacity is 63000kVA, and very near apart from upper level power supply, be approximately 1km ~ 5km, height above sea level is less than 2000m, minimum temperature-40 DEG C, aggregation resident load, and gradation for surface pollution is I grade, and this meteorological condition is applicable to Inner Mongolia;
B. higher level's transformer capacity is 63000kVA, and comparatively far away apart from upper level power supply, be approximately 20km ~ 50km, height above sea level is greater than 2000m-4500m, minimum temperature-30 DEG C, dispersion resident load, and gradation for surface pollution is II grade, and this meteorological condition is applicable to Northwest High Altitude area;
C. higher level's transformer capacity is 180000kVA, and comparatively near apart from upper level power supply, be approximately 5km ~ 20km, height above sea level is greater than and is less than 2000m, minimum temperature-20 DEG C, industrial load, and gradation for surface pollution is III grade, and this meteorological condition is applicable to part remote districts.
(4) based on power supply-electrical network-load integration, the type selecting of 35/0.4kV Zhi Peitai district proterctive equipment is assessed;
Described step (4) comprising: to carrying out power supply-electrical network-load integrated synthesis assessment under the selecting type scheme of the 35/0.4kV Zhi Peitai district proterctive equipment in step (2) in step (3) application region; in conjunction with reliability, economy and Safety Evaluation Index, draw and optimum relaying configuration scheme under optimizing different application region.
Reliability evaluation index comprises: can automatic recovery of power supply and failure rate; Economic feasibility target comprises: equipment cost and operation and maintenance expenses are used; Safety Evaluation Index comprise obvious breaking point and maximum can drop-out current.
Wherein, the selecting type scheme of 35/0.4kV Zhi Peitai district proterctive equipment:
A) 35kV side adopts circuit breaker-isolating switch, and 0.4kV side adopts breaker of plastic casing;
B) 35kV side adopts on-load switch-fuse, and 0.4kV side adopts breaker of plastic casing;
C) 35kV side adopts fuse switch, and 0.4kV side adopts breaker of plastic casing;
D) 35kV side adopts and inserts fuse-backup fuse, and 0.4kV side adopts breaker of plastic casing;
Wherein, power supply refers to bulk power grid, distributed power source.
(5) 35/0.4kV Zhi Peitai district protection device selection is completed.On the basis of step (1)-(4), for often kind of typical apply region, select the optimum protection device selection scheme in 35/0.4kV Zhi Peitai district, form protection device selection explanation, proterctive equipment operation curve, equipment protection schematic diagram.
In appraisal procedure herein, the weight of reliability and economy gets (being also the set point according to expertise) according to subordinate's level method analysis; on this basis; select optimum proterctive equipment configuration; achieve the optimization of 35/0.4kV Zhi Peitai district protection device selection; effectively improve mains supply reliability, add the range of application in 35/0.4kV Zhi Peitai district.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (12)
1. an appraisal procedure for 35/0.4kV Zhi Peitai district protection device selection, is characterized in that, described method defines the optimum protection device selection in different application region, and described method comprises the steps:
(1) influencing factor of 35/0.4kV Zhi Peitai district protection device selection in the construction of 35kV distributionization is determined;
(2) 35/0.4kV Zhi Peitai district fuse sectionalised protection scheme is proposed;
(3) determine the weight of 35/0.4kV Zhi Peitai district protection device selection influencing factor, set up analytic hierarchy process (AHP) assessment models;
(4) based on power supply-electrical network-load integration, the type selecting of 35/0.4kV Zhi Peitai district proterctive equipment is assessed;
(5) 35/0.4kV Zhi Peitai district protection device selection is completed.
2. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 1 protection device selection, it is characterized in that, in described step (1), the factor affecting 35/0.4kV Zhi Peitai district relaying configuration in the construction of 35kV distribution comprises impact on higher level's electrical network, environmental condition and part throttle characteristics;
The described impact on 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. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 1 protection device selection, it is characterized in that, described step (2) comprising: in conjunction with existing protection device selection scheme, there is provided 35kV side, 35/0.4kV Zhi Peitai district to adopt the collocation method of fuse sectionalised protection, realize 35/0.4kV Zhi Peitai district relaying configuration by insertion fuse and backup fuse combination; Determine 35/0.4kV Zhi Peitai district protection device selection scheme;
Described existing protection device selection scheme comprises: circuit breaker-isolating switch combination, on-load switch-fuse combination and fuse switch.
4. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 3 protection device selection, is characterized in that, by analyzing fuse protected ampere-time characteristic, determining 35kV side fuse arrangement scheme.
5. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 3 protection device selection, it is characterized in that, described 35/0.4kV Zhi Peitai district protection device selection scheme comprises:
A) 35kV side adopts circuit breaker-isolating switch, and 0.4kV side adopts breaker of plastic casing;
B) 35kV side adopts on-load switch-fuse, and 0.4kV side adopts breaker of plastic casing;
C) 35kV side adopts fuse switch, and 0.4kV side adopts breaker of plastic casing;
D) 35kV side adopts and inserts fuse-backup fuse, and 0.4kV side adopts breaker of plastic casing.
6. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 5 protection device selection; it is characterized in that; for multiple operating condition and the fault type of 35/0.4kV Zhi Peitai district high and low pressure side; guarantee that high-tension fuse to run or under failure condition, fuse can be correct cut-offs normal, determine the Type Selection Principle being applicable to 35/0.4kV Zhi Peitai district fuse.
7. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 6 protection device selection, is characterized in that, described in be applicable to 35/0.4kV Zhi Peitai district fuse Type Selection Principle comprise:
Fuse blows is inserted, backup fuse fusing during inside transformer short circuit when A, step down side short circuit;
B, meet transformer excitation flow, ensure that inserting fuse in 0.1s is failure to actuate;
C, meet transformer overload, ensure that inserting fuse in 30s is failure to actuate;
D, to meet step down side three short circuit current be 22 times of high-pressure side rated current, and backup fuse is failure to actuate;
The crosspoint I of E, insertion fuse and backup fuse
cross≤ 2.5kA, meets insertion fuse and cut-offs capacity;
When F, transformer normally run, high-pressure side rated current should, with insertion fuse blows curve without intersection point, ensure to insert fuse when transformer normally runs without damage.
8. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 6 protection device selection; it is characterized in that; the Type Selection Principle being applicable to 35/0.4kV Zhi Peitai district fuse comprises the reason analyzed and cause low pressure feeder switch overstep tripping; with reference to low tension switch relaying configuration scheme, the conventional setting value of accounting low pressure trip device.
9. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 1 protection device selection; it is characterized in that; described step (3) is on the basis of step (1) and step (2), draws, comprise the steps: in conjunction with three quasi-representative application regions
1. the significance level analyzing each influencing factor sorts;
2. fuzzy judgment matrix is constructed, quantitative analysis influencing factor;
Wherein, calculation of short-circuit current formula is as follows: directly join platform offset according to the calculation of parameter of higher level's transformer and 35/0.4kV and calculate short circuit current I from the distance of higher level's transformer
(a):
Wherein: S
1: 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 is kA; U
1: primary side voltage, unit is kV; U
2: secondary side voltage, unit is kV; U
k%: transformer impedance percentage; Z
1: system impedance, unit is Ω; Z
t: transformer impedance, unit is Ω; R
0: unit line resistance, unit is Ω; X
0: unit line reactance, unit is Ω; L: short dot is to transformer distance, and unit is km; Z
a: short dot impedance, unit is Ω; U
av: the voltage of higher level's transformer;
3. set up Analytic hierarchy process assessment models, provide optimal case by higher level's analytic hierarchy process (AHP), subordinate's analytic hierarchy process (AHP) is assessed optimal case.
10. the appraisal procedure of 35/0.4kV Zhi Peitai district as claimed in claim 9 protection device selection; it is characterized in that, the computational methods of short circuit current are as 35/0.4kV Zhi Peitai district high-pressure side protection device selection in 35kV distribution and the foundation protecting fixed value adjusting.
The appraisal procedure of 11. 35/0.4kV Zhi Peitai district as claimed in claim 1 protection device selections; it is characterized in that; in described step (4); according to the impact on upper level power supply, environmental condition, part throttle characteristics; for the relaying configuration of 35/0.4kV Zhi Peitai district high and low pressure side, binding hierarchy analytic approach assessment models, carries out power supply-electrical network-load integration protection assessment; select optimal sequencing, optimize the optimum relaying configuration scheme under different application region.
The appraisal procedure of 12. 35/0.4kV Zhi Peitai district as claimed in claim 1 protection device selections, it is characterized in that, described step (5) comprising: according to assessment result adjustment 35/0.4kV Zhi Peitai district protection device selection; Finally form the protection device selection explanation of 35/0.4kV Zhi Peitai district, proterctive 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 CN103219710A (en) | 2013-07-24 |
| CN103219710B true 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) |
Families Citing this family (3)
| 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 |
| 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 |
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 |
|---|
| 35kV变电站配电化应用;詹涛等;《农村电气化》;20110228(第2期);第10-12页 * |
| 35kV智能配电化建设及应用;宋海生等;《青海电力》;20121231;第31卷;第36-37页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103219710A (en) | 2013-07-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| McDermott et al. | Distributed generation impact on reliability and power quality indices | |
| CN103872665B (en) | Power distribution network integrated protection method suitable for access of distributed power supplies | |
| CN103001235B (en) | Method for evaluating risks of MOV (metal oxide varistor) of series capacitive compensator | |
| CN104124783A (en) | Electricity fetching device based on electric transmission line aerial thunder prevention ground wires | |
| CN112036690B (en) | Method for constructing power supply network of reclamation area | |
| CN102982230A (en) | Short circuit current exceeding auxiliary decision method based on node impedance sensitivity | |
| CN104377642A (en) | Method for setting reclosing time on basis of secondary arc currents and recovery voltages | |
| CN103219710B (en) | The appraisal procedure of a kind of 35/0.4kV Zhi Peitai district protection device selection | |
| CN102403701B (en) | Self-adaptive distance protection method for double-circuit line of intelligent substation | |
| Key et al. | On good behavior: Inverter-grid protections for integrating distributed photovoltaics | |
| CN103560497A (en) | Short-circuit current limiting method based on power grid topological adjustment | |
| CN105004944B (en) | A kind of power supply reliability computational methods assessed for power distribution network relay protection | |
| Agüero et al. | Improving the reliability of power distribution systems through single-phase tripping | |
| CN103344853A (en) | Method for judging faults of parallel capacitors by means of natural vibration frequency | |
| CN103728517B (en) | Correcting algorithm for transformer state assessment by considering poor working conditions | |
| CN105914720A (en) | DG-contained power distribution network protection method based on multi-point state quantity information | |
| CN107834544A (en) | A kind of neutral grounding in distribution power network remodeling method theoretical based on interval number | |
| Khan | Improving the reliability performance of medium voltage networks | |
| Liu et al. | Study of relay protection modeling and simulation on the basis of DIgSILENT | |
| CN108388725B (en) | Urban distribution network grounding line selection auxiliary decision-making system method based on expert system | |
| KR101133828B1 (en) | Apparstus and method for controlling the transformer in the low voltage distribution network | |
| Dong et al. | The offline accident of the large-scale wind generator system and its protection & control scheme | |
| CN104143817A (en) | Distance protecting device and method for power distribution network with distributed power supply | |
| Boaski et al. | Coordination and selectivity of protection devices with reliability assessment in distribution systems | |
| KR102298211B1 (en) | Protection apparatus using directional overcurrent ground relay and distance relay in grid-connected distributed generation |
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 |