CN206906465U - A kind of system for determining transformer substation system short circuit current - Google Patents
A kind of system for determining transformer substation system short circuit current Download PDFInfo
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- CN206906465U CN206906465U CN201720856002.XU CN201720856002U CN206906465U CN 206906465 U CN206906465 U CN 206906465U CN 201720856002 U CN201720856002 U CN 201720856002U CN 206906465 U CN206906465 U CN 206906465U
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Abstract
The utility model discloses a kind of system for determining transformer substation system short circuit current.The system includes initial electric parameter and provides module, for providing the initial electric parameter of transformer substation system；Data preprocessing module, for being pre-processed to initial electric parameter, calculate standard reduced value；Matrix computations module, for carrying out matrixing processing to standard reduced value, so as to obtain admittance matrix；Error coefficient computing module, for calculating the voltage coefficient of transformer substation system, and combine admittance matrix and calculate short circuit current；And result export module, for calculation of short-circuit current result to be exported, it is visually presented with result of calculation.For system of the present utility model in the case where considering different calculating principles, energy is convenient, fast and accurately carries out distant view short circuit current prospect and engineering calculation of short-circuit current.
Description
Technical field
Electric power network technique field is the utility model is related to, relate more specifically to a kind of determination transformer substation system short circuit current is
System.
Background technology
The overall development of " 13 " load at initial stage slows down, and stage tends to saturation, power transmission and transformation work for the development of power network scale
The center of gravity of journey is gradually by " newly-built " steering " increase-volume ", " enlarging ", " transformation " etc., it means that transition period will occur for electricity power engineering
Complication, engineering quantity increase, engineering construction cycle time etc. change, this accuracy, professional, versatility to system-computed
And computational efficiency will face higher requirement.
Core foundation of the calculation of short-circuit current as grid equipment type selecting, weight is provided with Practical Project and Electric Power Network Planning
Want meaning.To improve Engineering Task efficiency, different calculating principles how is considered, it is convenient accurately to carry out distant view short circuit current water
Open and flat prestige and rapid cut-off Current calculation are the problem of needing system design worker further to improve.
Or the correctness of existing its result of implementation is established to detailed, complicated, accurate modeling the basis of power network
On, and under different calculating principles, carry out the rapid cut-off galvanometer in the specific short circuit current level prospect of distant view and engineering
During calculation, redundancy and cumbersome is then shown slightly using professional software；The calculating that can only be simplified, interactivity and accuracy are poor,
And different calculation of boundary conditions are faced, larger defect be present, also cause efficiency low in its versatility.
Therefore, a kind of system of new quick determination transformer substation system short circuit current of exploitation is badly in need of in this area.
The content of the invention
The purpose of this utility model is to provide a kind of system for rapidly and accurately determining transformer substation system short circuit current and side
Method.
In the utility model, the utility model provides a kind of system for determining transformer substation system short circuit current.It is described
System includes：
Initial electric parameter provides module, for providing the initial electric parameter of transformer substation system；
Data preprocessing module, the initial electric parameter is obtained for providing module from the initial electric parameter, and
The initial electric parameter is pre-processed, calculates standard reduced value；
Matrix computations module, for carrying out matrixing processing to the standard reduced value of the data preprocessing module, so as to
Obtain admittance matrix；
Error coefficient computing module, for calculating the voltage coefficient of the transformer substation system, and with reference to the admittance matrix
Short circuit current is calculated, and
As a result export module, can for the calculation of short-circuit current result of the error coefficient computing module to be exported
Result of calculation depending on changing is presented；
Wherein, the initial electric parameter provides module and is connected with the data preprocessing module, the data prediction
Module is connected with the matrix computations module, the error coefficient computing module and the matrix computations module and the result
Export module connects.
In another preference, the system also includes control system.
In another preference, the control system is connected with transformer substation system.
In another preference, the control system is connected with the result export module.
In another preference, the initial electric parameter provides module and is connected with transformer substation system.
In another preference, the initial electric parameter, which provides module, also includes data manual input module.
In another preference, the system also includes result display module.
In another preference, the result display module is display.
In another preference, the result export module is connected with result display module.
It should be understood that in the scope of the utility model, above-mentioned each technical characteristic of the present utility model and below (such as implementation
Example) in specifically describe each technical characteristic between can be combined with each other, so as to form new or preferable technical scheme.It is limited to
Length, no longer tire out one by one state herein.
Brief description of the drawings
Fig. 1 is the system structure diagram of determination transformer substation system short circuit current of the present utility model.
Embodiment
The present inventor passes through extensively and in-depth study, and develop a kind of determination transformer substation system short circuit current first is
System.The system is intended to consider different calculating principles, easily carries out power network distant view short circuit current level prospect and quickly enters
Row calculation of short-circuit current, foundation can be not only provided for lectotype selection in engineering, and different regions power network future can be directed to
Short circuit current level develops, and coordinates macroscopical Electric Power Network Planning, there is provided lectotype selection guides.In bulk power grid, some transformer station is paid close attention to
Short circuit current level, the power network outside transformer station can be subjected to system equivalent, so as to simplified mathematical model.For by common
Three-winding transformer forms transformer station, and high-side system equivalent impedance is xs1, and the impedance of medium voltage side system equivalent is xs2, every master
Change high-pressure side, medium voltage side, the equiva lent impedance of low-pressure side are respectively x1 (i), x2 (i), x3 (i), based on this model, you can
The short circuit current level for carrying out electricity grid substation calculates.
Simultaneously it is determined that during transformer substation system short circuit current, to improve accuracy and usability, need to examine in the case of feature
Consider following principle：
Consider foozle：Transformer can have error in actual production process middle impedance, in general in -10%~﹢
Between 10%, therefore, the foozle of transformer impedance can have an impact to the short circuit current level of transformer station；
Consider non-standard no-load voltage ratio：When the tap rated voltage and power network rated voltage of transformer are inconsistent or pressure regulation tap
Head position after regulation, considers whether non-standard no-load voltage ratio can be to having an impact to the short circuit current level of transformer station as needed.Cause
This utility model is provided with error coefficient computing module.
The utility model is completed on this basis.
Term
As used herein, term " short circuit current " refers to power system in operation, sends out between phase and phase or between phase and ground
The electric current flowed through during raw improper connection, its value are far longer than rated current.
As used herein, term " non-standard no-load voltage ratio " refers to when the tap rated voltage and power network rated voltage of transformer differ
After cause or pressure regulation tap joint position are adjusted as needed, the ratio between each side rated voltage of actual no-load voltage ratio and power network of transformer difference
When, produce non-standard no-load voltage ratio.
Major advantage of the present utility model includes：
(a) system of the present utility model for determining transformer substation system short circuit current, in the case where considering different calculating principles,
Energy is convenient, fast and accurately carries out distant view short circuit current prospect and engineering calculation of short-circuit current；
(b) system of the present utility model for determining transformer substation system short circuit current, has good versatility, expansibility
It is and intelligent；
(c) the system-computed efficiency high of the present utility model for determining transformer substation system short circuit current.
Initial electric parameter, which provides the available initial electric parameter of module, to be included：Main transformer number of units, power network rated voltage, mark
Claim voltage, each main transformer parameter (capacity, actual tap voltage, main transformer impedance etc.), height/medium voltage side system side short circuit current, impedance
Foozle etc.；As a result export module output content includes：The short circuit current of each voltage class of transformer station.
Meanwhile to improve calculation of short-circuit current accuracy and applicability, it is contemplated that impedance foozle and non-standard no-load voltage ratio.
Data preprocessing module calculates main transformer impedance perunit value according to the initial electric parameter of offer and (only converted through overcapacity
And meter and impedance error), high, middle side system impedance perunit value, the anti-perunit value of low-pressure side string, non-standard no-load voltage ratio conversion factor；By mistake
Poor coefficients calculation block can calculate voltage coefficient；
Matrixing is carried out on this basis, and N platform transformers admittance matrix arranged side by side is formed in matrix computations module.
Newest short circuit current result in being calculated according to admittance matrix and voltage coefficient.
Result of calculation includes voltage gear, magnitude of voltage and the circulation of the pressure regulation side of every main transformer.
The system of the present utility model for determining transformer substation system short circuit current is provided with result export module, can tie output
Tab phenolphthaleinum, which goes out to excel to be easy to directly replicate, to be used.
The system of the present utility model for determining transformer substation system short circuit current is additionally provided with result display module, calculates structure
It can be directly displayed in result display module.
With reference to specific embodiment, the utility model is expanded on further.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.
It should be noted that in the claim and specification of this patent, such as first and second or the like relation
Term is used merely to make a distinction an entity or operation with another entity or operation, and not necessarily requires or imply
Any this actual relation or order be present between these entities or operation.Moreover, term " comprising ", "comprising" or its
Any other variant is intended to including for nonexcludability so that process, method, article including a series of elements or
Equipment not only includes those key elements, but also the other element including being not expressly set out, or also include for this process,
Method, article or the intrinsic key element of equipment.In the absence of more restrictions, wanted by what sentence " including one " limited
Element, it is not excluded that other identical element in the process including the key element, method, article or equipment also be present.
Embodiment 1
As shown in figure 1, the system of the present utility model for determining transformer substation system short circuit current includes：Initial electric parameter carries
For module, for providing the initial electric parameter of transformer substation system；Data preprocessing module, for from the initial electric parameter
Module is provided and obtains the initial electric parameter, and the initial electric parameter is pre-processed, calculates standard reduced value；Square
Battle array computing module, for carrying out matrixing processing to the standard reduced value of the data preprocessing module, so as to obtain admittance square
Battle array；Error coefficient computing module, for calculating the voltage coefficient of the transformer substation system, and it is short with reference to admittance matrix calculating
Road electric current, and result export module, for the calculation of short-circuit current result of the error coefficient computing module to be exported,
It is visually presented with result of calculation；Wherein, the initial electric parameter provides module and is connected with the data preprocessing module, institute
State data preprocessing module to be connected with the matrix computations module, the error coefficient computing module and the matrix computations module
And the result export module connection.The system considers impedance foozle, non-standard no-load voltage ratio and the anti-number of low pressure lateral spacing
According to possessing higher accuracy and applicability.
Embodiment 2
Engineering feasibility study-impedance type selecting
The initial electric parameter of the present embodiment is：Somewhere 500kV transformer stations four main transformers of present situation, wherein #1, #2 master
Varying capacity is 750MVA；#3, #4 main transformer capacity are 1000MVA, and this engineering project transform #1, #2 main transformer as 2 × 1200MVA,
Each main transformer parameter is as follows：
#1, #2 main transformer：Senior middle school/height/medium or low resistance resists for 14%；
#3, #4 main transformer：High middle impedance is 16%；
One of an important factor for high middle impedance of this engineering replacing main transformer is chosen is the station short circuit current level, is advised according to power network
Draw, rack change in two years is smaller, and short circuit current level is close.
Therefore, to meet the prospect zone of engineering proposal, distant view short circuit current level need to be looked forward to, looks forward to the change
Power station 500kV busbar short-circuit electric currents reach 60kA, and station 220kV busbar short-circuit electric currents are calculated, while according to the power transformation
220kV subregions installation scale, the short circuit current that main transformer medium voltage side system provides are estimated by 7.5kA where standing.
Using system of the present utility model, above-mentioned initial electric parameter is manually entered, the short circuit electricity to different high middle impedances
Stream is calculated, and considers non-standard no-load voltage ratio, as a result such as table 1 of result derived from export module, and according to result of calculation, this engineering is changed
The high middle impedance selection 22% of main transformer, if station distant view 4 × 1200MVA of scale, can control 220kV sides short circuit current in 48kA
Below；If the station 2 × 1200+2 of distant view scale × 1000MVA, 220kV sides short circuit current can be controlled in below 48kA, it is comprehensive
Close and consider power network development uncertainty and prospect zone, it is proposed that this engineering changes the high middle impedance of main transformer and chooses 22%.
Certain the station distant view Three-phase Short-circuit Current of table 1 calculates (unit kA)
Embodiment 3
Somewhere 1000MVA main transformer low-pressure sides short circuit current research and impedance are chosen and suggested
As Power grid structure is increasingly close, power supply increases, the short circuit current level of power network is caused to raise, 1000MVA
Important component of the transformer as power network, its impedance type selecting can produce shadow to grid short circuit levels of current, space truss project
Ring.
The common modular design impedance of 1000MVA main transformers at present has two groups：18%/58%/38% and 20%/62%/
40%, using system of the present utility model, consider the progressively development of power network, high-pressure side, medium voltage side short circuit current level are adjusted
To distant view 60kA, 48kA level, low-pressure side short circuit current level is recorded under different calculating principles, as shown in table 2.According to
Result of calculation, it can be seen that 20%/62%/40% main transformer, reach in high-pressure side, medium voltage side distant view short circuit current level
On the premise of higher level, different calculating principles are considered, low-pressure side maximum short circuit current still not over 40kA, therefore, is
Meet the development of area power grid distant view, the unification of lectotype selection, it is proposed that the impedance of newly-built 1000MVA main transformers presses 20%/62%/40%
Consider.
Low-pressure side short circuit current level (unit kA) under the different calculating principle of table 2
To sum up, by calculating, compared with prior art, result of calculation is more accurate for system of the present utility model, and it was calculated
Cheng Gengwei is simplified efficiently, and it has good directive significance in Practical Project for sorts of systems conceptual design, decision-making.
All it is incorporated as referring in this application in all documents that the utility model refers to, just as each document quilt
It is individually recited as with reference to such.In addition, it is to be understood that after above-mentioned instruction content of the present utility model has been read, this area skill
Art personnel can make various changes or modifications to the utility model, and these equivalent form of values equally fall within the application appended claims
Book limited range.
Claims (9)
1. a kind of system for determining transformer substation system short circuit current, it is characterised in that the system includes
Initial electric parameter provides module, for providing the initial electric parameter of transformer substation system；
Data preprocessing module, the initial electric parameter is obtained for providing module from the initial electric parameter, and to institute
State initial electric parameter to be pre-processed, calculate standard reduced value；
Matrix computations module, for carrying out matrixing processing to the standard reduced value of the data preprocessing module, so as to obtain
Admittance matrix；
Error coefficient computing module, calculated for calculating the voltage coefficient of the transformer substation system, and with reference to the admittance matrix
Short circuit current；And
As a result export module, for the calculation of short-circuit current result of the error coefficient computing module to be exported, visualization
Result of calculation is presented in ground；
Wherein, the initial electric parameter provides module and is connected with the data preprocessing module, the data preprocessing module
It is connected with the matrix computations module, the error coefficient computing module exports with the matrix computations module and the result
Module connects.
2. the system as claimed in claim 1, it is characterised in that the system also includes control system.
3. system as claimed in claim 2, it is characterised in that the control system is connected with transformer substation system.
4. system as claimed in claim 2, it is characterised in that the control system is connected with the result export module.
5. the system as claimed in claim 1, it is characterised in that the initial electric parameter provides module and connected with transformer substation system
Connect.
6. the system as claimed in claim 1, it is characterised in that it is also manual including data that the initial electric parameter provides module
Input module.
7. the system as claimed in claim 1, it is characterised in that the system also includes result display module.
8. system as claimed in claim 7, it is characterised in that the result display module is display.
9. system as claimed in claim 7, it is characterised in that the result export module is connected with result display module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720856002.XU CN206906465U (en) | 2017-07-14 | 2017-07-14 | A kind of system for determining transformer substation system short circuit current |
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| CN201720856002.XU CN206906465U (en) | 2017-07-14 | 2017-07-14 | A kind of system for determining transformer substation system short circuit current |
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| CN206906465U true CN206906465U (en) | 2018-01-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254187A (en) * | 2017-07-14 | 2019-01-22 | 中国电力工程顾问集团华东电力设计院有限公司 | A kind of system and method for determining transformer substation system short circuit current |
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- 2017-07-14 CN CN201720856002.XU patent/CN206906465U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254187A (en) * | 2017-07-14 | 2019-01-22 | 中国电力工程顾问集团华东电力设计院有限公司 | A kind of system and method for determining transformer substation system short circuit current |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Ziqiu Inventor after: Zhang Kai Inventor after: Li Feike Inventor after: Tao Yanfeng Inventor before: Liu Ziqiu Inventor before: Zhang Kai Inventor before: Li Feike |