CN209592978U - Electric system - Google Patents
Electric system Download PDFInfo
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- CN209592978U CN209592978U CN201920502842.5U CN201920502842U CN209592978U CN 209592978 U CN209592978 U CN 209592978U CN 201920502842 U CN201920502842 U CN 201920502842U CN 209592978 U CN209592978 U CN 209592978U
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- electric system
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- voltage protector
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Abstract
The utility model relates to technical field of power systems, propose that a kind of electric system, the electric system include the electrical equipment of standardized designs, electric system further includes neutral point and over-voltage protector.Neutral point is connect by a resistance with ground terminal；Over-voltage protector is connect with the electrical equipment, for protecting the electrical equipment.On the one hand the electric system that the disclosure provides can satisfy dielectric level, on the other hand, operation maintenance is simple, cost is relatively low.
Description
Technical field
The utility model relates to technical field of power systems more particularly to a kind of electric system.
Background technique
It include such as breaker etc. there are many electrical equipment in electric system.For the stable operation for guaranteeing electric system, In
During electric power system design, need to consider the insulating capacity of each electrical equipment.Each electrical equipment all has insulation tolerance
Parameter is pressed, needs to select suitable electrical equipment according to the class of insulation of electric system in electric power system design.However, electrical
The insulation tolerance pressure parameter characterization of equipment be the electrical equipment under height above sea level 1000m state insulating capacity.When height above sea level increases,
Due to the factors such as rarefaction of air air pressure is low, air insulation remitted its fury will cause, electrical apparatus external insulation level reduces.Therefore,
Electric system is arranged at high altitude localities, cannot apply the electrical equipment chosen under low altitude area state.
In the related technology, High aititude Insulation Problems are solved, reinforcement insulation mode is mostly used, i.e., it is exhausted outside reinforcement High-Voltage Electrical Appliances
Edge increases creep distance etc. to meet external insulation requirement, for example, using 24kV switchgear or inlet air insulation cabinet.
However, in the related technology, needing special customized corresponding electrical equipment for different height above sea levels, cause electrical
Nonstandardization of equipment is serious, while the safe distance of configured in one piece is also required to adjust accordingly.Design complexity, cost is caused to increase
Add, operation and maintenance difficulty.
It should be noted that the information in above-mentioned background technology part utility model is only used for reinforcing to the utility model
The understanding of background, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Utility model content
The purpose of this utility model is to provide a kind of electric system and design methods, in the related technology with solution, for
Different height above sea levels needs special customized corresponding electrical equipment, causes nonstandardization of electrical equipment serious, while entirety is matched
The safe distance set is also required to adjust accordingly.Cause the technical problem of complicated design, cost increase, operation and maintenance difficulty.
Other characteristics and advantages of the utility model will be apparent from by the following detailed description, or partially by this
The practice of utility model and acquistion.
One side according to the present utility model, provides a kind of electric power system design method, and the electric system includes standard
Change the electrical equipment of design, which comprises
The neutral point of the electric system is connect by a resistance with ground terminal；
An over-voltage protector is provided according to the height above sea level of the electric system, the over-voltage protector is for protecting
The electrical equipment.
In a kind of exemplary embodiment of the disclosure, an overvoltage is provided according to the height above sea level of the electric system and is protected
Protect device, comprising:
According to the height above sea level of the electric system, the mistake is obtained in conjunction with the insulation tolerance pressure parameter of the electrical equipment
The limit residual voltage value of voltage protector；
The over-voltage protector working voltage is obtained according to the maximum voltage value of the electric system；
The over-voltage protector is provided according to the limit residual voltage value and working voltage of the over-voltage protector.
In a kind of exemplary embodiment of the disclosure, according to the height above sea level of the electric system, in conjunction with described electrical
The insulation tolerance pressure parameter of equipment obtains the limit residual voltage value of the over-voltage protector, comprising:
The altitude correction factor of the insulation of electrical installation withstanding voltage is obtained according to the height above sea level of the electric system；
According to formula V1=V2/K1/K2, the limit residual voltage value is calculated, wherein V1 is the limit residual voltage value, and V2 is institute
The insulation tolerance pressure parameter of electrical equipment is stated, K1 is the altitude correction factor, and K2 is residual voltage correction factor.
In a kind of exemplary embodiment of the disclosure, the resistance is 10-20 ohm.
In a kind of exemplary embodiment of the disclosure, the over-voltage protector includes arrester.
In a kind of exemplary embodiment of the disclosure, the electrical equipment includes breaker.
One side according to the present utility model, provides a kind of electric system, and the electric system includes standardized designs
Electrical equipment, the electric system further include:
Neutral point is connect by a resistance with ground terminal；
Over-voltage protector is connect with the electrical equipment, for protecting the electrical equipment.
In a kind of exemplary embodiment of the disclosure, the resistance is 10-20 ohm.
In a kind of exemplary embodiment of the disclosure, the over-voltage protector includes arrester.
In a kind of exemplary embodiment of the disclosure, the electrical equipment includes breaker.
In a kind of exemplary embodiment of the disclosure, it is the area 4700m that the electrical equipment, which is applied to height above sea level, described disconnected
The insulation tolerance pressure of road device is 72KV, the model HY5WZ2-12/32.4 of the arrester.
The utility model proposes a kind of electric system and design method, the electric system includes the electrical of standardized designs
Equipment, electric power system design method include: to connect the neutral point of the electric system with ground terminal by a resistance；According to institute
The height above sea level for stating electric system provides an over-voltage protector, and the over-voltage protector is for protecting the electrical equipment.
The neutral point of the electric system is connect by a resistance with ground terminal by the electric power system design method that the disclosure provides, and works as electricity
When Force system overvoltage, electric system can be with automatic trip, to reduce overvoltage injury, the insulation for reducing electric system etc.
Grade；Electrical equipment can protect by over-voltage protector simultaneously.On the one hand the electric system that the disclosure provides can satisfy absolutely
Edge grade, on the other hand, the electric system use the electrical equipment of standardized designs, and do not need to reinforce insulation set, because
And its operation maintenance is simple, cost is relatively low.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The utility model can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets the utility model
Embodiment, and be used to explain the principles of the present invention together with specification.It should be evident that the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of exemplary embodiment of disclosure electric power system design method；
Fig. 2 is the flow chart of disclosure electric power system design method another kind exemplary embodiment；
Fig. 3 is a kind of structural schematic diagram of exemplary embodiment of disclosure electric system.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be real in a variety of forms
It applies, and is not understood as limited to example set forth herein；On the contrary, thesing embodiments are provided so that the utility model will be more complete
Face and complete, and the design of example embodiment is comprehensively communicated to those skilled in the art.Identical appended drawing reference in figure
Indicate same or similar structure, thus the detailed description that them will be omitted.
Although the term of relativity, such as "upper" "lower" is used to describe a component of icon for another in this specification
The relativeness of one component, but these terms are in this manual merely for convenient, for example, with reference to the accompanying drawings described in show
The direction of example.It is appreciated that, if making it turn upside down the device overturning of icon, the component described in "upper" will
As the component in "lower".Term of other relativities, such as "high" " low " "top" "bottom" " left side " " right side " etc. are also made to have similar
Meaning.When certain structure is at other structures "upper", it is possible to refer to that certain structural integrity is formed in other structures, or refer to certain structure
It is " direct " to be arranged in other structures, or refer to that certain structure is arranged in other structures by the way that another structure is " indirect ".
Term "one", " one ", " described " to indicate there are one or more elements/component part/etc.；Term " packet
Include " and " having " to indicate the open meaning being included and refer to that the element/component part/in addition to listing waits it
Outside also may be present other element/component part/etc..
The present exemplary embodiment provides a kind of electric power system design method, and the electric system includes the electricity of standardized designs
Gas equipment, as shown in Figure 1, being a kind of flow chart of exemplary embodiment of disclosure electric power system design method, the method packet
It includes:
Step S1: the neutral point of the electric system is connect by a resistance with ground terminal；
Step S: an over-voltage protector is provided according to the height above sea level of the electric system, the over-voltage protector is used
In the protection electrical equipment.
Wherein, " electrical equipments of standardized designs " refer to, electric system does not consider height above sea level to electrical equipment in design
The insulation tolerance pressure parameter of electrical equipment is thought of as actual insulation tolerance pressure value by the influence of insulation characterisitic.
The present exemplary embodiment proposes that a kind of electric system and design method, the electric system include standardized designs
Electrical equipment, electric power system design method include: to connect the neutral point of the electric system with ground terminal by a resistance；Root
An over-voltage protector is provided according to the height above sea level of the electric system, the over-voltage protector described is electrically set for protecting
It is standby.The neutral point of the electric system is connect by a resistance with ground terminal by the electric power system design method that the disclosure provides,
When electric system is excessively electric, electric system can be with automatic trip, to reduce overvoltage injury, the insulation for reducing electric system etc.
Grade；Electrical equipment can protect by over-voltage protector simultaneously.On the one hand the electric system that the disclosure provides can satisfy absolutely
Edge grade, on the other hand, the electric system use the electrical equipment of standardized designs, and do not need to reinforce insulation set, because
And its operation maintenance is simple, cost is relatively low.
Above-mentioned steps are described in detail below:
In the present exemplary embodiment, as shown in Fig. 2, being disclosure electric power system design method another kind exemplary embodiment
Flow chart.An over-voltage protector is provided according to the height above sea level of the electric system, may include:
Step S11: it according to the height above sea level of the electric system, is obtained in conjunction with the insulation tolerance pressure parameter of the electrical equipment
Take the limit residual voltage value of the over-voltage protector；
Step S12: the over-voltage protector working voltage is obtained according to the maximum voltage value of the electric system；
Step S13: the overvoltage protection is provided according to the limit residual voltage value and working voltage of the over-voltage protector
Device.
In the present exemplary embodiment, step S11: according to the height above sea level of the electric system, in conjunction with the electrical equipment
Insulation tolerance pressure parameter obtain the limit residual voltage value of the over-voltage protector, may include: according to the electric system
Height above sea level obtains the altitude correction factor of the insulation of electrical installation withstanding voltage；According to formula V1=V2/K1/K2, calculate
The limit residual voltage value, wherein V1 is the limit residual voltage value, and V2 is the insulation tolerance pressure parameter of the electrical equipment, and K1 is institute
Altitude correction factor is stated, K2 is residual voltage correction factor, and residual voltage adjusted coefficient K 2 can choose 1.4.Wherein, according to the power train
The height above sea level of system obtains the altitude correction factor of the insulation of electrical installation withstanding voltage, can be according to formula K1=em(H -1000)/8150It obtains, wherein H is height above sea level；M=1 is used for power frequency, lightning impulse and alternate operating impulse voltage；M=0.9 is for indulging
Insulate operating impulse voltage；M=0.75 is for relatively operating impulse voltage.
In the present exemplary embodiment, step S12: the overvoltage is obtained according to the maximum voltage value of the electric system and is protected
Device working voltage is protected, may include: to be obtained according to formula U1=0.8*U2, wherein U1 is the working voltage of over-voltage protector,
U2 is the maximum voltage value of electric system.
In the present exemplary embodiment, step S13: mentioned according to the limit residual voltage value and working voltage of the over-voltage protector
For the over-voltage protector, it may include: to choose an over-voltage protector model, its residual voltage value made to be less than limit residual voltage value
V1, and its voltage rating is made to be greater than working voltage U1.
In the present exemplary embodiment, the resistance can be 10-20 ohm.When resistance can be 10-20 ohm, the electricity
Force system belongs to low resistance earthing, and under low resistance earthing mode, electric system requires the insulating capacity of electrical equipment lower.
So as to further decrease the class of insulation of electric system.
In Operation of Electric Systems, the overvoltage for acting on electrical equipment is specifically included that when electric system operates normally
Continuous running voltage, the lightning surge from exterior and the switching overvoltage inside electric system.
In the present exemplary embodiment, the over-voltage protector can be arrester；The electrical equipment can be open circuit
Device.The present exemplary embodiment is illustrated by taking arrester and short-circuiting device as an example.Wherein, arrester can be for from exterior
Lightning surge.Breaker can choose common 12KV breaker, and the insulation tolerance pressure of 12KV breaker is 72KV.It is right below
It is illustrated in the electric power system design that height above sea level is the area 4700m.
In the area that height above sea level is 4700m, the altitude correction factor K1=e of above-mentioned breaker1(4700-1000)/8150=1.57.Its
In, since arrester can be directed to the lightning surge from exterior, m takes 1.According to above-mentioned calculating limit residual voltage value
Formula V1=V2/K1/K2 is it follows that limit residual voltage value V1=V2/K1/K2=72/1.57/1.4=34.12KV.Obtain electric power
The maximum voltage value of system is 12KV, according to above-mentioned calculating working voltage formula U1=0.8*U2=9.6KV.So as to basis
Hardware Description Manual selection power station type composite insulating metal oxide lightning arrester HY5WZ2-12/32.4 protects breaker,
In, the voltage rating of the HY5WZ2-12/32.4 type arrester is 12KV, and residual voltage value is 32.4KV.
It should be understood that electrical equipment can also be other electrical equipments, over-voltage protector can also be other mistakes
Voltage protector, the m in above-mentioned altitude correction factor formula can be directed to object select according to over-voltage protector, these are all
Belong to the protection scope of the disclosure.
The present exemplary embodiment also provides a kind of electric system, as shown in Fig. 2, exemplary for disclosure electric system one kind
The structural schematic diagram of embodiment.The electric system includes the electrical equipment 1 of standardized designs, the electric system further include:
Neutral point 2 and over-voltage protector 3.Neutral point 2 is connect by a resistance R with ground terminal GND；Over-voltage protector and the electricity
Gas equipment connection, for protecting the electrical equipment.
In the present exemplary embodiment, the resistance can be 10-20 ohm.
In the present exemplary embodiment, the over-voltage protector may include arrester.
In the present exemplary embodiment, the electrical equipment may include breaker.
The electric system and above-mentioned design of circuit system method technology having the same that the present exemplary embodiment provides are special
It seeks peace working principle, above content has been described in detail, and details are not described herein again.
Those skilled in the art will readily occur to the disclosure after considering specification and practicing utility model disclosed herein
Other embodiments.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes
Or adaptive change follow the general principles of this disclosure and including the disclosure it is undocumented in the art known in often
Knowledge or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by right
It is required that pointing out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the attached claims.
Claims (5)
1. a kind of electric system, the electric system includes the electrical equipment of standardized designs, which is characterized in that further include:
Neutral point is connect by a resistance with ground terminal；
Over-voltage protector is connect with the electrical equipment, for protecting the electrical equipment.
2. electric system according to claim 1, which is characterized in that the resistance is 10-20 ohm.
3. electric system according to claim 1, which is characterized in that the over-voltage protector includes arrester.
4. electric system according to claim 3, which is characterized in that the electrical equipment includes breaker.
5. electric system according to claim 4, which is characterized in that the electrical equipment is applied to height above sea level for 4700m
Area, the insulation tolerance pressure of the breaker are 72KV, the model HY5WZ2-12/32.4 of the arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920502842.5U CN209592978U (en) | 2019-04-12 | 2019-04-12 | Electric system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920502842.5U CN209592978U (en) | 2019-04-12 | 2019-04-12 | Electric system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209592978U true CN209592978U (en) | 2019-11-05 |
Family
ID=68348033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920502842.5U Active CN209592978U (en) | 2019-04-12 | 2019-04-12 | Electric system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209592978U (en) |
-
2019
- 2019-04-12 CN CN201920502842.5U patent/CN209592978U/en active Active
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