CN108092242A - A kind of multi-voltage grade power grid inverse time current protection method and apparatus - Google Patents
A kind of multi-voltage grade power grid inverse time current protection method and apparatus Download PDFInfo
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- CN108092242A CN108092242A CN201711232504.6A CN201711232504A CN108092242A CN 108092242 A CN108092242 A CN 108092242A CN 201711232504 A CN201711232504 A CN 201711232504A CN 108092242 A CN108092242 A CN 108092242A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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Abstract
The present invention provides a kind of multi-voltage grade power grid inverse time current protection method and apparatus, first determines the first protective device, the second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device；It is then determined that the first protective device, the second protective device and the 3rd protective device respective actuation time；Inverse time current protection finally is carried out to multi-voltage grade power grid, the inverse time-lag protection of multi-voltage grade power grid is not only realized, but also shortens fault clearing time；The present invention is modified the first protective device, the second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device by the first protective device, the second protective device and the 3rd respective voltage correction factor of protective device; the actuation time of inverse time current protection can be effectively improved, enhances the adaptability of inverse time current protection reply multi-voltage grade power grid.
Description
Technical field
The present invention relates to technical field of relay protection, and in particular to a kind of multi-voltage grade power grid inverse time current protection side
Method and device.
Background technology
Relay protection is China's electric system " the first line of defence ", it is ensureing power system security, economy and is stablizing fortune
Row etc. takes on highly important task.Current relay protection has time delay over-current protection and inverse time current to protect
The protection of shield, wherein time delay over-current is widely used in China's power grid, and actuation time is fixed, with the size of short circuit current flow without
It closes.In order to meet the requirement of protective seletion, protective device actuation time increases step by step from user to power supply, so with more
In the circuit of grade protection, the overcurrent protection operation time limit close to power end is long, when catastrophe failure occurs for circuit, short circuit electricity
Stream is very big, influences power equipment and system stable operation, it is necessary to protect quick excision failure, but time delay over-current protection by
It is fixed in actuation time, can not quickly cut off failure.
Inversely, fault current is bigger for the size of inverse time current protection institute's actuation time and fault current, action
Time is shorter, and fault current is smaller, and actuation time is longer, and performance is protected better than above-mentioned time delay over-current.Existing skill
Inverse time current protection in art uses zero-sequence current, is affected by abort situation, and transformer can block zero-sequence current access,
Fixed inverse time current protection can be only applied to same voltage class power grid, and for different voltages level Grid back-up protection
Between cooperation rely primarily on the overcurrent protection of specified time, when low-voltage-grade grid collapses, voltage levels electricity
The back-up protection actuation time of net is long, and the back-up protection with inverse time characteristic is applied to multi-voltage grade power grid, can
To significantly improve the speed of back-up protection, but during due to low-voltage-grade electric network fault, voltage levels electric network fault electric current
It is identical with low-voltage-grade power network current, abort situation cannot be distinguished, therefore inverse time current protection of the prior art is uncomfortable
For different voltages level Grid.And when trouble point distance protection installation place farther out when, zero-sequence current is smaller, inverse time current
Guard time is long.
The content of the invention
In order to overcome the above-mentioned time of inverse time current protection in the prior art long and not be suitable for different voltages level Grid
The defects of, the present invention provides a kind of multi-voltage grade power grid inverse time current protection method, first determines the first protective device, second
Protective device and the respective inverse time current protection operation curve equation of the 3rd protective device；Then according to the first protective device,
Second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device determine the first protective device,
Two protective devices and the 3rd protective device respective actuation time；Finally according to the first protective device, the second protective device and
Three protective devices respective actuation time carries out inverse time current protection to multi-voltage grade power grid, realizes multi-voltage grade power grid
Inverse time-lag protection, shorten fault clearing time.
In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that：
On the one hand, the present invention provides a kind of multi-voltage grade power grid inverse time current protection method, the multi-voltage grade
Power grid includes the first equivalent power supply, transformer and the second equivalent power supply, by the between first equivalent power supply and transformer
One busbar connects, and the second busbar, transmission line of electricity and triple bus-bar are passed sequentially through between the transformer and the second equivalent power supply and is connected
It connects, the transmission line of electricity installs the first protective device, the line between the transformer and the second busbar close to the second busbar one side
The second protective device is installed in road, and the 3rd protective device is installed on the circuit between the transformer and the first busbar, including：
Determine that the first protective device, the second protective device and the respective inverse time current protection action of the 3rd protective device are bent
Line equation；
It is bent according to the first protective device, the second protective device and the respective inverse time current protection action of the 3rd protective device
Line equation determines the first protective device, the second protective device and the 3rd protective device respective actuation time；
According to the first protective device, the second protective device and the 3rd protective device respective actuation time to multi-voltage grade
Power grid carries out inverse time current protection.
It is described to be moved according to the first protective device, the second protective device and the 3rd respective inverse time current protection of protective device
The first protective device, the second protective device and the 3rd protective device respective actuation time are determined as curvilinear equation, including：
It is bent according to the first protective device, the second protective device and the respective inverse time current protection action of the 3rd protective device
Line equation determines voltage parameter and current parameters；
The first protective device, the second protective device and the 3rd protective device are determined according to voltage parameter and current parameters each
Actuation time.
The inverse time current protection operation curve equation of first protective device is determined by formula (1)：
Wherein, t1Represent the actuation time of the first protective device, I1Represent the measurement electric current at the first protective device, IpTable
Show starting current, K1Represent the voltage correction factor of the first protective device, andUe1Represent the first protective device
Rated voltage, U1Represent the measurement voltage at the first protective device, m1Represent the voltage margin of the first protective device, A represents electricity
Parameter is flowed, r represents voltage parameter.
The inverse time current protection operation curve equation of second protective device is determined by formula (2)：
Wherein, t2Represent the actuation time of the second protective device, I2Represent the measurement electric current at the second protective device, K2Table
Show the voltage correction factor of the second protective device, andUe2Represent the rated voltage of the second protective device, m2Table
Show the voltage margin of the second protective device, U '2Represent the offset voltage at the second protective device, and U '2=U2-I2×kZT, U2Table
Show the measurement voltage at the second protective device, ZTRepresent the impedance of change electric appliance, k represents penalty coefficient.
The inverse time current protection operation curve equation of second protective device is determined by formula (3)：
Wherein, t3Represent the actuation time of the 3rd protective device, I3Represent the measurement electric current at the 3rd protective device, K3Table
Show the voltage correction factor of the 3rd protective device, andUe3Represent the rated voltage of the 3rd protective device, m3Table
Show the voltage margin of the 3rd protective device, U3Represent the measurement voltage at the 3rd protective device.
It is bent according to the first protective device, the second protective device and the respective inverse time current protection action of the 3rd protective device
Line equation determines voltage parameter and current parameters, including：
Based on t2-t1=Δ t21, t3-t2=Δ t32, and according to the first protective device, the second protective device and the 3rd protection
The respective inverse time current protection operation curve equation of device obtains A and r, wherein, Δ t21Represent the second protective device and first
It is differential between protective device, Δ t32Represent differential between the 3rd protective device and the second protective device.
It is described according to the first protective device, the second protective device and the 3rd protective device respective actuation time to multivoltage
Level Grid carries out inverse time current protection, including：
If transmission line of electricity end is broken down, by t1Afterwards, the first protective device acts, and the second protective device and the 3rd is protected
Protection unit is failure to actuate；
If the second busbar breaks down, by t2Afterwards, the second protective device acts, the first protective device and the 3rd protection dress
It puts and is failure to actuate；
If transformer breaks down, by t3Afterwards, the 3rd protective device acts, the first protective device and the second protective device
It is failure to actuate.
On the other hand, the present invention also provides a kind of multi-voltage grade power grid inverse time current protection device, the multivoltages
Level Grid includes the first equivalent power supply, transformer and the second equivalent power supply, leads between first equivalent power supply and transformer
The connection of the first busbar is crossed, it is female that the second busbar, transmission line of electricity and the 3rd are passed sequentially through between the transformer and the second equivalent power supply
Line connects, and the transmission line of electricity installs the first protective device close to the second busbar one side, between the transformer and the second busbar
Circuit on the second protective device is installed, the 3rd protective device, bag are installed on the circuit between the transformer and the first busbar
It includes：
First determining module, for determining that the first protective device, the second protective device and the 3rd protective device are respective anti-
Time limit current protection operation curve equation；
Second determining module, for respective anti-according to the first protective device, the second protective device and the 3rd protective device
Time limit current protection operation curve equation determines the first protective device, the second protective device and the 3rd respective action of protective device
Time；
Protection module, during for according to the first protective device, the second protective device and the respective action of the 3rd protective device
Between to multi-voltage grade power grid carry out inverse time current protection.
Second determining module includes：
Parameter determination unit, according to the first protective device, the second protective device and the 3rd protective device respective inverse time lag
Current protection operation curve equation determines voltage parameter and current parameters；
Time determination unit determines the first protective device, the second protective device and according to voltage parameter and current parameters
Three protective devices respective actuation time.
First determining module includes the first equation determination unit, and the first equation determination unit is determined by formula (1)
The inverse time current protection operation curve equation of first protective device：
Wherein, t1Represent the actuation time of the first protective device, I1Represent the measurement electric current at the first protective device, IpTable
Show starting current, K1Represent the voltage correction factor of the first protective device, andUe1Represent the first protective device
Rated voltage, U1Represent the measurement voltage at the first protective device, m1Represent the voltage margin of the first protective device, A represents electricity
Parameter is flowed, r represents voltage parameter.
First determining module further includes second equation determination unit, and the second equation determination unit is true by formula (2)
The inverse time current protection operation curve equation of fixed second protective device：
Wherein, t2Represent the actuation time of the second protective device, I2Represent the measurement electric current at the second protective device, K2Table
Show the voltage correction factor of the second protective device, andUe2Represent the rated voltage of the second protective device, m2Table
Show the voltage margin of the second protective device, U '2Represent the offset voltage at the second protective device, and U '2=U2-I2×kZT, U2Table
Show the measurement voltage at the second protective device, ZTRepresent the impedance of change electric appliance, k represents penalty coefficient.
First determining module includes third party's journey determination unit, and third party's journey determination unit is determined by formula (3)
The inverse time current protection operation curve equation of second protective device：
Wherein, t3Represent the actuation time of the 3rd protective device, I3Represent the measurement electric current at the 3rd protective device, K3Table
Show the voltage correction factor of the 3rd protective device, andUe3Represent the rated voltage of the 3rd protective device, m3Table
Show the voltage margin of the 3rd protective device, U3Represent the measurement voltage at the 3rd protective device.
The parameter determination unit is specifically used for：
Based on t2-t1=Δ t21, t3-t2=Δ t32, and according to the first protective device, the second protective device and the 3rd protection
The respective inverse time current protection operation curve equation of device obtains A and r, wherein, Δ t21Represent the second protective device and first
It is differential between protective device, Δ t32Represent differential between the 3rd protective device and the second protective device.
The protection module is specifically used for：
If transmission line of electricity end is broken down, by t1Afterwards, the first protective device acts, and the second protective device and the 3rd is protected
Protection unit is failure to actuate；
If the second busbar breaks down, by t2Afterwards, the second protective device acts, the first protective device and the 3rd protection dress
It puts and is failure to actuate；
If transformer breaks down, by t3Afterwards, the 3rd protective device acts, the first protective device and the second protective device
It is failure to actuate.
Compared with the immediate prior art, technical solution provided by the invention has the advantages that：
Multi-voltage grade power grid inverse time current protection method provided by the invention first determines the first protective device, second
Protective device and the respective inverse time current protection operation curve equation of the 3rd protective device；Then according to the first protective device,
Second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device determine the first protective device,
Two protective devices and the 3rd protective device respective actuation time；Finally according to the first protective device, the second protective device and
Three protective devices respective actuation time carries out inverse time current protection to multi-voltage grade power grid, not only realizes multivoltage etc.
The inverse time-lag protection of grade power grid, and shorten fault clearing time；
Multi-voltage grade power grid inverse time current protection device provided by the invention is determined including the first determining module, second
Module and protection module, wherein the first determining module is used to determine the first protective device, the second protective device and the 3rd protection dress
Put respective inverse time current protection operation curve equation, the second determining module therein is used for according to the first protective device, the
Two protective devices and the respective inverse time current protection operation curve equation of the 3rd protective device determine the first protective device, second
Protective device and the 3rd protective device respective actuation time；Protection module therein, for according to the first protective device, second
Protective device and the 3rd protective device respective actuation time carry out inverse time current protection to multi-voltage grade power grid, not only real
Show the inverse time-lag protection of multi-voltage grade power grid, and shorten fault clearing time；
In technical solution provided by the invention, using the NATURAL DISTRIBUTION and measurement voltage of network voltage under failure with fault bit
Mobile changing rule is put, and passes through the first protective device, the second protective device and the respective voltage amendment of the 3rd protective device
Coefficient is to the first protective device, the second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device
It is modified, the actuation time of inverse time current protection can be effectively improved, enhance inverse time current protection reply multivoltage
The adaptability of level Grid.
Description of the drawings
Fig. 1 is multi-voltage grade configuration of power network in the embodiment of the present invention；
Fig. 2 is multi-voltage grade power grid inverse time current protection method flow diagram in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
On the one hand, the embodiment of the present invention provides a kind of multi-voltage grade power grid inverse time current protection method, multivoltage etc.
The structure chart of grade power grid is as shown in Figure 1, in Fig. 1, G1Represent the first equivalent power supply, T indication transformers, G2Represent the second equivalent electricity
Source, B represent the first busbar, and C represents the second busbar, and D represents triple bus-bar, R1Represent the first protective device, R2Represent the second protection
Device, R3Represent the 3rd protective device, F represents trouble point.Specifically, multi-voltage grade power grid includes the first equivalent power supply G1, become
Depressor T and the second equivalent power supply G2, the first equivalent power supply G1It is connected between transformer T by the first busbar B, transformer T and
Two equivalent power supply G2Between pass sequentially through the second busbar C, transmission line of electricity and triple bus-bar D connections, transmission line of electricity is female close to second
First protective device R is installed line C one sides1, the second protective device R is installed on the circuit between transformer T and the second busbar C2, become
3rd protective device R is installed on the circuit between depressor T and the first busbar B3, multi-voltage grade electricity provided in an embodiment of the present invention
Net inverse time current protection method particular flow sheet is as shown in Fig. 2, detailed process is as follows：
S101：Determine the first protective device, the second protective device and the 3rd respective inverse time current protection of protective device
Operation curve equation；
S102：According to the first protective device, the second protective device and the 3rd respective inverse time current protection of protective device
Operation curve equation determines the first protective device, the second protective device and the 3rd protective device respective actuation time；
S103：According to the first protective device, the second protective device and the 3rd protective device respective actuation time to mostly electric
Level Grid is pressed to carry out inverse time current protection.
In above-mentioned S101, the inverse time current protection operation curve equation of the first protective device is determined by formula (1)：
Wherein, t1Represent the actuation time of the first protective device, I1Represent the measurement electric current at the first protective device, IpTable
Show starting current, IpTake 300A；K1Represent the voltage correction factor of the first protective device, andUe1Represent first
The rated voltage of protective device, Ue1It is desirableU1Represent the measurement voltage at the first protective device, m1Represent first
The voltage margin of protective device, m1Desirable 1.1；A represents current parameters, and r represents voltage parameter.
In above-mentioned S101, the inverse time current protection operation curve equation of the second protective device is determined by formula (2)：
Wherein, t2Represent the actuation time of the second protective device, I2Represent the measurement electric current at the second protective device, K2Table
Show the voltage correction factor of the second protective device, andUe2Represent the rated voltage of the second protective device, Ue2
It is desirablem2Represent the voltage margin of the second protective device, m2Desirable 1.1；U′2Represent the benefit at the second protective device
Repay voltage, and U '2=U2-I2×kZT, U2Represent the measurement voltage at the second protective device, ZTRepresent the impedance of change electric appliance, k tables
Show penalty coefficient, k can use 0.3.
In above-mentioned S101, the inverse time current protection operation curve equation of the second protective device is determined by formula (3)：
Wherein, t3Represent the actuation time of the 3rd protective device, I3Represent the measurement electric current at the 3rd protective device, K3Table
Show the voltage correction factor of the 3rd protective device, andUe3Represent the rated voltage of the 3rd protective device, it can
It takesm3Represent the voltage margin of the 3rd protective device, m3Desirable 1.1；U3Represent the measurement at the 3rd protective device
Voltage.
In above-mentioned S101, NATURAL DISTRIBUTION and the variation moved with abort situation of measurement voltage of network voltage under failure are utilized
Rule, and pass through the first protective device, the second protective device and the 3rd respective voltage correction factor of protective device and protected to first
Protection unit, the second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device are modified, with
Trouble point with protecting the increase of installation place distance, fault current reduces, measurement voltage increase, can for before amendment
To be effectively improved the actuation time of inverse time current protection, the suitable of inverse time current protection reply multi-voltage grade power grid is enhanced
Ying Xing.
In above-mentioned S102, rationed the power supply according to the first protective device, the second protective device and the 3rd protective device respective inverse time
Stream protection act curvilinear equation determines the first protective device, the second protective device and the 3rd protective device respective actuation time,
Detailed process is as follows：
1st, acted according to the first protective device, the second protective device and the respective inverse time current protection of the 3rd protective device
Curvilinear equation determines voltage parameter and current parameters, and detailed process is as follows：
It is based onAndAnd root
It is obtained according to the first protective device, the second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device
A and r, wherein, Δ t21Represent differential between the second protective device and the first protective device, Δ t32Represent the 3rd protective device
And second is differential between protective device, and when two-phase short-circuit fault occurs for transmission line of electricity end (i.e. F points in Fig. 1), Δ t21
With Δ t32Desirable 0.5s；
2nd, determine that the first protective device, the second protective device and the 3rd protective device are each according to voltage parameter and current parameters
From actuation time.
In above-mentioned S103, according to the first protective device, the second protective device and the 3rd protective device respective actuation time
Inverse time current protection, the following three kinds of situations of detailed process point are carried out to multi-voltage grade power grid：
1) if transmission line of electricity end is broken down, by t1Afterwards, the first protective device acts, the second protective device and the 3rd
Protective device is failure to actuate；
2) if the second busbar breaks down, by t2Afterwards, the second protective device acts, the first protective device and the 3rd protection
Device is failure to actuate；
If 3) transformer breaks down, by t3Afterwards, the 3rd protective device acts, the first protective device and the second protection dress
It puts and is failure to actuate.
On the other hand, the embodiment of the present invention also provides a kind of multi-voltage grade power grid inverse time current protection device, mostly electric
Level Grid structure chart is pressed as shown in Figure 1, in Fig. 1, G1Represent the first equivalent power supply, T indication transformers, G2Represent that second is equivalent
Power supply, B represent the first busbar, and C represents the second busbar, and D represents triple bus-bar, R1Represent the first protective device, R2Represent that second protects
Protection unit, R3Represent the 3rd protective device, F represents trouble point.Specifically, multi-voltage grade power grid includes the first equivalent power supply G1、
Transformer T and the second equivalent power supply G2, the first equivalent power supply G1Be connected between transformer T by the first busbar B, transformer T with
Second equivalent power supply G2Between pass sequentially through the second busbar C, transmission line of electricity and triple bus-bar D connections, transmission line of electricity is close to second
First protective device R is installed busbar C one sides1, the second protective device R is installed on the circuit between transformer T and the second busbar C2,
3rd protective device R is installed on the circuit between transformer T and the first busbar B3, multi-voltage grade power grid inverse time current guarantor
Protection unit includes the first determining module, the second determining module and protection module, introduces the specific work(of above-mentioned 3 modules separately below
Energy：
First determining module therein, for determining that the first protective device, the second protective device and the 3rd protective device are each
From inverse time current protection operation curve equation；
Second determining module therein, for each according to the first protective device, the second protective device and the 3rd protective device
From inverse time current protection operation curve equation determine the first protective device, the second protective device and the 3rd protective device each
Actuation time；
Protection module therein, for respective according to the first protective device, the second protective device and the 3rd protective device
Actuation time carries out inverse time current protection to multi-voltage grade power grid.
The first above-mentioned determining module includes the first equation determination unit, and the first equation determination unit determines the by formula (1)
The inverse time current protection operation curve equation of one protective device：
Wherein, t1Represent the actuation time of the first protective device, I1Represent the measurement electric current at the first protective device, IpTable
Show starting current, K1Represent the voltage correction factor of the first protective device, andUe1Represent the first protective device
Rated voltage, U1Represent the measurement voltage at the first protective device, m1Represent the voltage margin of the first protective device, A represents electricity
Parameter is flowed, r represents voltage parameter.
The first above-mentioned determining module further includes second equation determination unit except including the first equation determination unit, and
Two equation determination units are determined the inverse time current protection operation curve equation of the second protective device by formula (2)：
Wherein, t2Represent the actuation time of the second protective device, I2Represent the measurement electric current at the second protective device, K2Table
Show the voltage correction factor of the second protective device, andUe2Represent the rated voltage of the second protective device, m2Table
Show the voltage margin of the second protective device, U '2Represent the offset voltage at the second protective device, and U '2=U2-I2×kZT, U2Table
Show the measurement voltage at the second protective device, ZTRepresent the impedance of change electric appliance, k represents penalty coefficient.
The first above-mentioned determining module further includes except including the first equation determination unit and second equation determination unit
Three equation determination units, third party's journey determination unit determine that the inverse time current protection of the second protective device acts song by formula (3)
Line equation：
Wherein, t3Represent the actuation time of the 3rd protective device, I3Represent the measurement electric current at the 3rd protective device, K3Table
Show the voltage correction factor of the 3rd protective device, andUe3Represent the rated voltage of the 3rd protective device, m3Table
Show the voltage margin of the 3rd protective device, U3Represent the measurement voltage at the 3rd protective device.
Above-mentioned second determining module specifically includes：
1) parameter determination unit, according to the first protective device, the second protective device and the 3rd protective device respective inverse time
Threshold currents protection act curvilinear equation determines voltage parameter and current parameters, and detailed process is as follows：
Based on t2-t1=Δ t21, t3-t2=Δ t32, and according to the first protective device, the second protective device and the 3rd protection
The respective inverse time current protection operation curve equation of device obtains A and r, wherein, Δ t21Represent the second protective device and first
It is differential between protective device, Δ t32Represent differential between the 3rd protective device and the second protective device；
2) time determination unit, according to voltage parameter and current parameters determine the first protective device, the second protective device and
3rd protective device respective actuation time.
When above-mentioned protection module is according to the first protective device, the second protective device and the respective action of the 3rd protective device
Between inverse time current protection is carried out to multi-voltage grade power grid, detailed process is divided into following three kinds of situations：
1) if transmission line of electricity end is broken down, by t1Afterwards, the first protective device acts, the second protective device and the 3rd
Protective device is failure to actuate；
2) if the second busbar breaks down, by t2Afterwards, the second protective device acts, the first protective device and the 3rd protection
Device is failure to actuate；
If 3) transformer breaks down, by t3Afterwards, the 3rd protective device acts, the first protective device and the second protection dress
It puts and is failure to actuate.
For convenience of description, each several part of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the application
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the application
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field with reference to above-described embodiment still can to the present invention specific embodiment modify or
Equivalent substitution, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent substitution
Within bright claims.
Claims (14)
1. a kind of multi-voltage grade power grid inverse time current protection method, the multi-voltage grade power grid includes the first equivalent electricity
Source, transformer and the second equivalent power supply are connected, the transformation between first equivalent power supply and transformer by the first busbar
It is close that the second busbar, transmission line of electricity and triple bus-bar connection, the transmission line of electricity are passed sequentially through between device and the second equivalent power supply
The first protective device is installed in second busbar one side, and the second protection dress is installed on the circuit between the transformer and the second busbar
It puts, the 3rd protective device is installed on the circuit between the transformer and the first busbar, which is characterized in that including：
Determine the first protective device, the second protective device and the 3rd respective inverse time current protection operation curve side of protective device
Journey；
According to the first protective device, the second protective device and the 3rd respective inverse time current protection operation curve side of protective device
Journey determines the first protective device, the second protective device and the 3rd protective device respective actuation time；
According to the first protective device, the second protective device and the 3rd protective device respective actuation time to multi-voltage grade power grid
Carry out inverse time current protection.
2. multi-voltage grade power grid inverse time current protection method according to claim 1, which is characterized in that the basis
First protective device, the second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device determine
One protective device, the second protective device and the 3rd protective device respective actuation time, including：
According to the first protective device, the second protective device and the 3rd respective inverse time current protection operation curve side of protective device
Journey determines voltage parameter and current parameters；
Determine that the first protective device, the second protective device and the 3rd protective device are respective dynamic according to voltage parameter and current parameters
Make the time.
3. multi-voltage grade power grid inverse time current protection method according to claim 2, which is characterized in that described first
The inverse time current protection operation curve equation of protective device is determined by formula (1)：
<mrow>
<msub>
<mi>t</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>K</mi>
<mn>1</mn>
</msub>
<mi>A</mi>
</mrow>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>I</mi>
<mn>1</mn>
</msub>
<mo>/</mo>
<msub>
<mi>I</mi>
<mi>p</mi>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, t1Represent the actuation time of the first protective device, I1Represent the measurement electric current at the first protective device, IpExpression is opened
Streaming current, K1Represent the voltage correction factor of the first protective device, andUe1Represent the volume of the first protective device
Constant voltage, U1Represent the measurement voltage at the first protective device, m1Represent the voltage margin of the first protective device, A represents electric current ginseng
Number, r represent voltage parameter.
4. multi-voltage grade power grid inverse time current protection method according to claim 3, which is characterized in that described second
The inverse time current protection operation curve equation of protective device is determined by formula (2)：
<mrow>
<msub>
<mi>t</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>K</mi>
<mn>2</mn>
</msub>
<mi>A</mi>
</mrow>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>I</mi>
<mn>2</mn>
</msub>
<mo>/</mo>
<msub>
<mi>I</mi>
<mi>p</mi>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, t2Represent the actuation time of the second protective device, I2Represent the measurement electric current at the second protective device, K2Represent the
The voltage correction factor of two protective devices, andUe2Represent the rated voltage of the second protective device, m2Represent the
The voltage margin of two protective devices, U2Offset voltage at the second protective device of ' expression, and U2'=U2-I2×kZT, U2Represent the
Measurement voltage at two protective devices, ZTRepresent the impedance of change electric appliance, k represents penalty coefficient.
5. multi-voltage grade power grid inverse time current protection method according to claim 4, which is characterized in that described second
The inverse time current protection operation curve equation of protective device is determined by formula (3)：
<mrow>
<msub>
<mi>t</mi>
<mn>3</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>K</mi>
<mn>3</mn>
</msub>
<mi>A</mi>
</mrow>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>I</mi>
<mn>3</mn>
</msub>
<mo>/</mo>
<msub>
<mi>I</mi>
<mi>p</mi>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, t3Represent the actuation time of the 3rd protective device, I3Represent the measurement electric current at the 3rd protective device, K3Represent the
The voltage correction factor of three protective devices, andUe3Represent the rated voltage of the 3rd protective device, m3Represent the
The voltage margin of three protective devices, U3Represent the measurement voltage at the 3rd protective device.
6. multi-voltage grade power grid inverse time current protection method according to claim 5, which is characterized in that the basis
First protective device, the second protective device and the respective inverse time current protection operation curve equation of the 3rd protective device determine electricity
Parameter and current parameters are pressed, including：
Based on t2-t1=Δ t21, t3-t2=Δ t32, and according to the first protective device, the second protective device and the 3rd protective device
Respective inverse time current protection operation curve equation obtains A and r, wherein, Δ t21Represent the second protective device and the first protection
It is differential between device, Δ t32Represent differential between the 3rd protective device and the second protective device.
7. multi-voltage grade power grid inverse time current protection method according to claim 5 or 6, which is characterized in that described
Multi-voltage grade power grid is carried out according to the first protective device, the second protective device and the 3rd protective device respective actuation time
Inverse time current protection, including：
If transmission line of electricity end is broken down, by t1Afterwards, the first protective device acts, the second protective device and the 3rd protection dress
It puts and is failure to actuate；
If the second busbar breaks down, by t2Afterwards, the second protective device acts, and the first protective device and the 3rd protective device are not
Action；
If transformer breaks down, by t3Afterwards, the 3rd protective device acts, and the first protective device and the second protective device are motionless
Make.
8. a kind of multi-voltage grade power grid inverse time current protection device, the multi-voltage grade power grid includes the first equivalent electricity
Source, transformer and the second equivalent power supply are connected, the transformation between first equivalent power supply and transformer by the first busbar
It is close that the second busbar, transmission line of electricity and triple bus-bar connection, the transmission line of electricity are passed sequentially through between device and the second equivalent power supply
The first protective device is installed in second busbar one side, and the second protection dress is installed on the circuit between the transformer and the second busbar
It puts, the 3rd protective device is installed on the circuit between the transformer and the first busbar, which is characterized in that including：
First determining module, for determining the first protective device, the second protective device and the 3rd protective device respective inverse time lag
Current protection operation curve equation；
Second determining module, for according to the first protective device, the second protective device and the 3rd protective device respective inverse time lag
When current protection operation curve equation determines the first protective device, the second protective device and the respective action of the 3rd protective device
Between；
Protection module, for according to the first protective device, the second protective device and the 3rd protective device respective actuation time pair
Multi-voltage grade power grid carries out inverse time current protection.
9. multi-voltage grade power grid inverse time current protection device according to claim 8, which is characterized in that described second
Determining module includes：
Parameter determination unit, according to the first protective device, the second protective device and the 3rd respective inverse time current of protective device
Protection act curvilinear equation determines voltage parameter and current parameters；
Time determination unit determines that the first protective device, the second protective device and the 3rd are protected according to voltage parameter and current parameters
Protection unit respective actuation time.
10. multi-voltage grade power grid inverse time current protection device according to claim 9, which is characterized in that described
One determining module includes the first equation determination unit, and the first equation determination unit determines the first protective device by formula (1)
Inverse time current protection operation curve equation：
<mrow>
<msub>
<mi>t</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>K</mi>
<mn>1</mn>
</msub>
<mi>A</mi>
</mrow>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>I</mi>
<mn>1</mn>
</msub>
<mo>/</mo>
<msub>
<mi>I</mi>
<mi>p</mi>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, t1Represent the actuation time of the first protective device, I1Represent the measurement electric current at the first protective device, IpExpression is opened
Streaming current, K1Represent the voltage correction factor of the first protective device, andUe1Represent the volume of the first protective device
Constant voltage, U1Represent the measurement voltage at the first protective device, m1Represent the voltage margin of the first protective device, A represents electric current ginseng
Number, r represent voltage parameter.
11. multi-voltage grade power grid inverse time current protection device according to claim 10, which is characterized in that described
One determining module further includes second equation determination unit, and the second equation determination unit determines the second protective device by formula (2)
Inverse time current protection operation curve equation：
<mrow>
<msub>
<mi>t</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>K</mi>
<mn>2</mn>
</msub>
<mi>A</mi>
</mrow>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>I</mi>
<mn>2</mn>
</msub>
<mo>/</mo>
<msub>
<mi>I</mi>
<mi>p</mi>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, t2Represent the actuation time of the second protective device, I2Represent the measurement electric current at the second protective device, K2Represent the
The voltage correction factor of two protective devices, andUe2Represent the rated voltage of the second protective device, m2Represent the
The voltage margin of two protective devices, U2Offset voltage at the second protective device of ' expression, and U2'=U2-I2×kZT, U2Represent the
Measurement voltage at two protective devices, ZTRepresent the impedance of change electric appliance, k represents penalty coefficient.
12. multi-voltage grade power grid inverse time current protection device according to claim 11, which is characterized in that described
One determining module includes third party's journey determination unit, and third party's journey determination unit determines the second protective device by formula (3)
Inverse time current protection operation curve equation：
<mrow>
<msub>
<mi>t</mi>
<mn>3</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>K</mi>
<mn>3</mn>
</msub>
<mi>A</mi>
</mrow>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>I</mi>
<mn>3</mn>
</msub>
<mo>/</mo>
<msub>
<mi>I</mi>
<mi>p</mi>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein, t3Represent the actuation time of the 3rd protective device, I3Represent the measurement electric current at the 3rd protective device, K3Represent the
The voltage correction factor of three protective devices, andUe3Represent the rated voltage of the 3rd protective device, m3Represent the
The voltage margin of three protective devices, U3Represent the measurement voltage at the 3rd protective device.
13. multi-voltage grade power grid inverse time current protection device according to claim 10, which is characterized in that the ginseng
Number determination unit is specifically used for：
Based on t2-t1=Δ t21, t3-t2=Δ t32, and according to the first protective device, the second protective device and the 3rd protective device
Respective inverse time current protection operation curve equation obtains A and r, wherein, Δ t21Represent the second protective device and the first protection
It is differential between device, Δ t32Represent differential between the 3rd protective device and the second protective device.
14. the multi-voltage grade power grid inverse time current protection device according to claim 12 or 13, which is characterized in that institute
Protection module is stated to be specifically used for：
If transmission line of electricity end is broken down, by t1Afterwards, the first protective device acts, the second protective device and the 3rd protection dress
It puts and is failure to actuate；
If the second busbar breaks down, by t2Afterwards, the second protective device acts, and the first protective device and the 3rd protective device are not
Action；
If transformer breaks down, by t3Afterwards, the 3rd protective device acts, and the first protective device and the second protective device are motionless
Make.
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| CN110739669A (en) * | 2019-10-30 | 2020-01-31 | 三峡大学 | inverse time limit overcurrent protection method based on impedance correction |
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