CN108199355B - Analysis electronic mutual inductor and electromagnetic transformer cooperate the method influenced on system protection - Google Patents
Analysis electronic mutual inductor and electromagnetic transformer cooperate the method influenced on system protection Download PDFInfo
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- CN108199355B CN108199355B CN201810116056.1A CN201810116056A CN108199355B CN 108199355 B CN108199355 B CN 108199355B CN 201810116056 A CN201810116056 A CN 201810116056A CN 108199355 B CN108199355 B CN 108199355B
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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
- 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
- H02H7/045—Differential protection of transformers
- H02H7/0455—Differential protection of transformers taking into account saturation of current transformers
-
- 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
Abstract
The invention discloses a kind of analysis electric mutual inductors and electromagnetic transformer to cooperate the method influenced on system protection, and steps are as follows: S1, gives the calculation formulae for related parameters of bus differential protecting；The relevant parameter includes Protection criteria, action current, stalling current and ratio；S2 establishes bus differential protecting model using PSCAD software；S3 obtains the difference current I of bus differential protectingdWith stalling current Ires: S4 carries out simulation analysis to three kinds of fault points respectively；Present invention utilizes the bus differential protectings established under PSCAD environment to emulate mould; bus differential protecting action performance by being emulated respectively to situations such as troubles inside the sample space, external area error and line outlet failure, under research electronic type (ECT), electromagnetic current transducer mutual cooperation.In the case of simulation result shows mixing access mutual inductor, although the raw abnormal increase of difference miscarriage in the case of making steady-state operation can completely eliminate its influence if the definite value of protection is set with reasonable nargin.
Description
Technical field
Current transformer technical field of the present invention, and in particular to a kind of analysis electronic mutual inductor is matched with electromagnetic transformer
Close the method influenced on system protection.
Background technique
Currently, there are the feelings of different type current transformer cooperation in conventional substation intelligence enlarging, transformation process
Shape, while as intelligent substation is built, there are electronic current mutual inductors and conventional electromagnetic current transformer for electric system
Mutually matched possibility, and the different Transfer characteristic of electronic type, electromagnetic current transducer may to relay protection of power system
It is influenced in the presence of certain.System research is carried out to electronic type, electromagnetic current transducer Transfer characteristic, is to propose relay protection reply
The premise of measure difference.When flowing into short circuit current in electromagnetic type electromagnetic transformer, aperiodic point contained in short circuit current
The effect of amount and electromagnetic transformer itself iron core remanent magnetism easily makes electromagnetic transformer iron core generate transient state saturation.Electromagnetic type electricity
After magnetic-type mutual inductor saturation, secondary side current can be deformed, can not transient state in correct progress of disease primary current, steady-state component.And
The problem of saturation is not present in corresponding electronic mutual inductor, and have biggish frequency response range, transient characterisitics are excellent.Differential guarantor
Each side of shield is typically chosen the close electromagnetic transformer of Transfer characteristic, and Transfer characteristic should not be had the electromagnetic type of larger difference
Mutual inductor is mixed in differential protection.When electromagnetic type electromagnetic transformer and electronic mutual inductor are mixed for differential protection
When, since the two Transfer characteristic diversity ratio is larger, in the transient process to break down outside protection zone, electromagnetic type electromagnetic type mutual inductance
The saturation of device will lead to the increase of difference current in differential relay, the reduction of stalling current, and protection is most probably caused to miss
Movement, this is also to realize that electromagnetic type TA and electronic mutual inductor are used in mixed way main problem to be solved.Simultaneously as electronics
The delay that the delay of formula mutual inductor (protection combining unit) output sampled data, trip protection GOOSE message pass through transmission of network
Etc. reasons, cause digital protection outlet movement be slower than traditional protection.
When short trouble occurs for electric system, the electric power of short-time current causes guide wire shake to lead to electronic mutual inductor
Positional shift occurs, when breaker, isolation switch etc. operate, can also make electronic mutual inductor that positional shift occur.Eccentric error
Cause electronic mutual inductor to generate measured deviation with heeling error, influences the correct operation of electronic mutual inductor.Operating breaker
When the waveform of interference transient current that generates in Current Transformer Secondary side be damping vibration attenuation oscillation wave, current waveform frequency exists
Between 1.5kHz~1.5MHz, amplitude is at this time affected to the measurement of electronic current mutual inductor, such as from tens to several hundred A
Fruit is not controlled, and precision can be influenced by very big.Violent vibration can be generated when breaker operator, acceleration is about 20g/
0.3mm。
Summary of the invention
For above-mentioned deficiency described in the prior, the present invention provides a kind of analysis electronic mutual inductor and electromagnetic type is mutual
Sensor cooperates the method influenced on system protection, and electronic mutual inductor of the present invention and the research of electromagnetic type mutual inductor adaptability problem can
To greatly improve accuracy and the reliability degree of electronic mutual inductor, meanwhile, it has been greatly reduced the scene of electronic mutual inductor
Maintenance cost promotes the development of electronic mutual inductor indirectly, improves the safety and reliability of New Generation of Intelligent substation, uses
In same for the Intelligent electronic-type mutual inductor present in existing intelligent substation transformation process and conventional electromagnetic mutual inductor
Shi Zuowei protective relaying device data acquire source when, the analysis and assessment to reliability of relay protection and acting characteristic, solve after
The adaptability problem of electric protection in this case.
In order to solve the above technical problems, the technical solution adopted in the present invention is as follows:
A method of analysis electronic mutual inductor and electromagnetic transformer cooperate on system protection influence, and steps are as follows:
S1 gives the calculation formulae for related parameters of bus differential protecting；
The relevant parameter includes Protection criteria, action current, stalling current and ratio；
S1.1, if there is n branch on single supply single busbar, corresponding current is respectivelyThe then Protection criteria of single busbar are as follows:
S1.2 gives action current of the bus differential protecting in troubles inside the sample spaceStalling currentAnd ratio K
Calculation formula:
Wherein,For the electric current of nth branch, andElectric current is after transient state saturation occurs for TA
S1.3 gives action current of the bus differential protecting in external area errorStalling currentAnd ratio K
Calculation formula:
Wherein,Fault current when external area error occurs for nth branch, electric current is after transient state saturation occurs for TA
S2 establishes bus differential protecting model using PSCAD software；
The bus differential protecting model, two inlet wires including left side, the initial phase angle of power supply is 0 °；Three of right side
Outlet, respectively first outlet, Article 2 outlet and Article 3 outlet, first outlet, Article 2 outlet and Article 3 go out
The initial phase angle of the power supply of line paper is followed successively by 10 °, 20 ° and 30 °；And troubles inside the sample space point K1, external area error point K2 and route are set
Export fault point K3 and fault type, time of fault inception and trouble duration.
S3 obtains the difference current I of bus differential protecting according to step S2dWith stalling current Ires:
S4 carries out simulation analysis to three kinds of fault points respectively；
S4.1, troubles inside the sample space
When carrying out troubles inside the sample space emulation, there are two types of type is protected, the first is that two inlet wires are protected with electronic mutual inductor,
Three outlets are protected with electromagnetic transformer, and second is that an inlet wire is protected with electronic mutual inductor, another inlet wire and three
The equal electricity consumption electromagnetic transformer protection of outlet；
S4.1.1 carries out simulation analysis to the first protection type；
Troubles inside the sample space stalling current I is calculated using Matlab in conjunction with step S1.1 and step S3 in S4.1.1.1resWith
Difference current IdAnd troubles inside the sample space stalling current and difference current are compared and analyzed；
S4.1.1.2 obtains the ratio of troubles inside the sample space bus differential protecting in conjunction with step S1.2 and step S4.1.1.1, and
Analyze troubles inside the sample space bus differential protecting broken line ratio-restrained characteristic figure；
S4.1.1.3 is obtained according to step S4.1.1.1 and S4.1.1.2 in the protection of two inlet wire electronic mutual inductors, three
In the case of outlet is protected with electromagnetic transformer, if troubles inside the sample space occurs, bus differential protecting can be acted correctly；
S4.1.2 carries out simulation analysis to second of protection type；
Troubles inside the sample space stalling current I is calculated using Matlab in conjunction with step S1.1 and step S3 in S4.1.2.1resWith
Difference current IdAnd troubles inside the sample space stalling current and difference current are compared and analyzed；
S4.1.2.2 obtains the ratio of troubles inside the sample space bus differential protecting in conjunction with step S1.2 and step S4.1.2.1, and
Analyze troubles inside the sample space bus differential protecting broken line ratio-restrained characteristic figure；
S4.1.2.3 obtains and protected in an inlet wire with electronic mutual inductor according to step S4.1.2.1 and S4.1.2.2, one
In the case of inlet wire and three outlets are protected with electromagnetic transformer, if troubles inside the sample space occurs, bus differential protecting being capable of positive positive motion
Make；
S4.2, external area error
When carrying out external area error emulation, there are two types of type is protected, the first is that two inlet wires are protected with electronic mutual inductor,
Three outlets are protected with electromagnetic transformer, and second is that two inlet wires are protected with an outlet with electronic mutual inductor, two outlet electricity consumptions
The protection of magnetic-type mutual inductor；
S4.2.1 carries out simulation analysis to the first protection type；
External area error stalling current I is calculated using Matlab in conjunction with step S1.3 and step S3 in S4.2.1.1resWith
Difference current IdAnd external area error stalling current and difference current are compared and analyzed；
S4.2.1.2 obtains the ratio of external area error bus differential protecting in conjunction with step S1.3 and step S4.2.1.1, and
The outer fault bus differential protection broken line ratio-restrained characteristic figure of analysis area；
S4.2.1.3 is obtained according to step S4.2.1.1 and S4.2.1.2 in the protection of two inlet wire electronic mutual inductors, three
In the case of outlet is protected with electromagnetic transformer, if external area error occurs, bus differential protecting has the possibility malfunctioned,
This is caused by serious saturation occurs as the electromagnetic transformer in failure outlet；
S4.2.2 carries out simulation analysis to second of protection type；
External area error stalling current I is calculated using Matlab in conjunction with step S1.3 and step S3 in S4.2.1.1resWith
Difference current IdAnd external area error stalling current and difference current are compared and analyzed；
S4.2.1.2 obtains the ratio of external area error bus differential protecting in conjunction with step S1.3 and step S4.2.1.1, and
The outer fault bus differential protection broken line ratio-restrained characteristic figure of analysis area；
S4.2.1.3 is obtained according to step S4.2.1.1 and S4.2.1.2 in two inlet wires and an outlet electronic type mutual inductance
Device protection, in the case of two outlets are protected with electromagnetic transformer, if external area error occurs, bus differential protecting is malfunctioned
Possibility；
S4.3, line outlet failure
When simulated line exports failure, the protection type of use is that inlet wire is protected with electronic mutual inductor, and outlet is equal
It is protected with electromagnetic transformer；
Line outlet failure stalling current I is calculated using Matlab in conjunction with step S1.1 and step S3 in S4.3.1res
With difference current IdAnd line outlet failure stalling current and difference current are compared and analyzed；
S4.3.2 obtains the ratio of line outlet fault bus differential protection in conjunction with step S1.3 and step S4.3.1, and
Analytical line exports fault bus differential protection broken line ratio-restrained characteristic figure；
S4.3.3 obtains in entire failure process according to step S4.3.1 and S4.3.2, the equal very little of action current, far
Less than the minimum working current I of difference currentd0, that is to say, that it is unsatisfactory for bus differential protecting criterion, bus differential protecting is reliable
It is failure to actuate.
Present invention utilizes the bus differential protectings established under PSCAD environment to emulate mould, by event outside troubles inside the sample space, area
Situations such as barrier and line outlet failure, is emulated respectively, studies electronic type (electronic mutual inductor), electromagnetic current transducer
Bus differential protecting action performance under cooperating.In the case of simulation result shows mixing access mutual inductor, although can make
The raw abnormal increase of difference miscarriage in the case of steady-state operation can disappear completely if the definite value of protection is set with reasonable nargin
Except its influence.When the transient faults such as ground short circuit occur for power transmission line, the current transformer Transfer characteristic of two kinds of different models
Difference is differential for circuit longitudinal and the influence of transformer differential protection equally can be ignored.Even if same voltage etc.
Part mutual inductor does not replace with electronic current mutual inductor in grade bus, and the reliability of protective device is generally also superior to whole
Use the situation of electromagnetic current transducer.The present invention gives a kind of methods of quantitative analysis, for assessing relay protection dress
Whether can with reliability service in electronic mutual inductor with electromagnetic current transducer mix access the case where, and propose protection if setting
Definite value setting method, to avoid due to different principle current transformer mix access when caused by protective relaying maloperation.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is bus differential protecting model schematic of the present invention.
Fig. 2 is the troubles inside the sample space primary current waveform diagram under the first protection type of the present invention.
Fig. 3 is the troubles inside the sample space secondary current waveform diagram under the first protection type of the present invention.
Fig. 4 is the troubles inside the sample space stalling current and action current comparison diagram under the first protection type of the present invention.
Fig. 5 is the troubles inside the sample space bus differential protecting broken line ratio-restrained characteristic figure under the first protection type of the present invention.
Fig. 6 is the troubles inside the sample space primary current waveform diagram under second of protection type of the present invention.
Fig. 7 is the troubles inside the sample space secondary current waveform diagram under second of protection type of the present invention.
Fig. 8 is the troubles inside the sample space stalling current and action current comparison diagram under second of protection type of the present invention.
Fig. 9 is the troubles inside the sample space bus differential protecting ratio-restrained characteristic figure under second of protection type of the present invention.
Figure 10 is the external area error primary current waveform diagram under the first protection type of the present invention.
Figure 11 is the external area error secondary current waveform diagram under the first protection type of the present invention.
Figure 12 is the external area error stalling current and action current comparison diagram under the first protection type of the present invention.
Figure 13 is the external area error bus differential protecting ratio-restrained characteristic figure under the first protection type of the present invention.
Figure 14 is the external area error primary current waveform diagram under second of protection type of the present invention.
Figure 15 is the external area error secondary current waveform diagram under second of protection type of the present invention.
Figure 16 is the external area error stalling current and action current comparison diagram under second of protection type of the present invention.
Figure 17 is the ratio brake coefficient figure under second of protection type of the present invention.
Figure 18 is line outlet failure primary current waveform diagram of the present invention.
Figure 19 is line outlet failure secondary current waveform diagram of the present invention.
Figure 20 is line outlet failure stalling current of the present invention and action current comparison diagram.
Figure 21 is line outlet fault bus differential protection ratio-restrained characteristic figure of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under that premise of not paying creative labor
Embodiment shall fall within the protection scope of the present invention.
A method of analysis electronic mutual inductor and electromagnetic transformer cooperate on system protection influence, and steps are as follows:
S1 gives the calculation formulae for related parameters of bus differential protecting；
The relevant parameter includes Protection criteria, action current, stalling current and ratio；
S1.1, if there is n branch on single supply single busbar, corresponding current is respectivelyThe then Protection criteria of single busbar are as follows:
S1.2 gives action current of the bus differential protecting in troubles inside the sample spaceStalling currentAnd ratio K
Calculation formula:
Wherein,For the electric current of nth branch, andElectric current is after transient state saturation occurs for TA
S1.3 gives action current of the bus differential protecting in external area errorStalling currentAnd ratio K
Calculation formula:
Wherein,Fault current when external area error occurs for nth branch, electric current is after transient state saturation occurs for TA
S2 establishes bus differential protecting model using PSCAD software；
The bus differential protecting model, as shown in Figure 1, including two inlet wires in left side, the initial phase angle of power supply is 0 °；
Three outlets on right side, are set as 200km route, respectively first outlet, Article 2 outlet and Article 3 outlet, and first
The initial phase angle of power supply of outlet, Article 2 outlet and Article 3 outlet paper is followed successively by 10 °, 20 ° and 30 °；And event in area is set
When hindering point K1, external area error point K2 and line outlet fault point K3 and fault type, time of fault inception and lasting failure
Between.
Fault point switch is controlled by associated control modules, and fault type is A phase ground short circuit, and time of fault inception is set as
0.2s, trouble duration 0.05s.Step-length is set as 50 μ s, sample rate 20kHz, i.e. 400 sampled point/periods.
S3 obtains the difference current I of bus differential protecting according to step S2dWith stalling current Ires:
S4 carries out simulation analysis to three kinds of fault points respectively；
S4.1, troubles inside the sample space
When carrying out troubles inside the sample space emulation, there are two types of type is protected, the first is that two inlet wires are protected with electronic mutual inductor,
Three outlets are protected with electromagnetic transformer, and second is that an inlet wire is protected with electronic mutual inductor, another inlet wire and three
Outlet is protected with electromagnetic transformer；
S4.1.1 carries out simulation analysis to the first protection type；
Troubles inside the sample space (at K1) occurs at this time, primary current waveform and secondary current waveform are as shown in Figures 2 and 3.
Compare two width figures it can be found that operate normally when inlet wire and outlet the equal very little of load current, primary current size
In 1kA or so, for secondary current size in 1A or so, inlet wire current and outlet current phase are reversed.
When A phase ground short circuit occurring at K1, that is, when troubles inside the sample space occurs, inlet wire current and outlet current phase are in the same direction.
Inlet wire and the electric current of outlet increase, and the primary current of inlet wire sharply increases to 27.5kA, are then influenced by attenuating dc component, pass through
Two cycles, are down to 19.8kA；The primary current of outlet increases to 3.1kA, then the shadow by slight attenuating dc component
It rings, by two cycles, is down to 2.3kA.Inlet wire first sharply increases to 20.8A by the secondary current of electronic mutual inductor, then by
Attenuating dc component influences, and by two cycles, is down to 15.5A；Outlet first increases by the secondary current of electromagnetic transformer
It to 3.0A, is then influenced by slight attenuating dc component, by two cycles, is down to 2.1A.
At the end of failure, inlet wire by the secondary current of electronic mutual inductor there are apparent smearing, when continuing
Between about 0.02s, size of current is about 6.2A.After smearing, and it is restored to normal operating condition.
Troubles inside the sample space stalling current I is calculated using Matlab in conjunction with step S1.1 and step S3 in S4.1.1.1resWith
Difference current IdAnd troubles inside the sample space stalling current and difference current are compared and analyzed；
Enable K=0.6, Id0The amplitude of secondary side current, phase data are imported in Matlab, I are calculated by=2AdWith
Ires, troubles inside the sample space stalling current and difference current comparison diagram are then obtained, as shown in Figure 4.
It will be seen that being almost completely coincident with stalling current in failure phase action current from Fig. 4, it is much higher than me
The bus differential protecting operating criterion K I that setsres, bus differential protecting can act correctly.
S4.1.1.2 obtains the ratio of troubles inside the sample space bus differential protecting in conjunction with step S1.2 and step S4.1.1.1, and
Analyze troubles inside the sample space bus differential protecting broken line ratio-restrained characteristic figure；
With IresFor X-axis, with IdFor Y-axis, troubles inside the sample space bus differential protecting broken line ratio-restrained characteristic figure is obtained.Such as Fig. 5
It is shown.Broken line in figure is the broken line ratio-restrained characteristic curve of corresponding differential protection, and the point above broken line indicates to be in
Active region, and the point below broken line is indicated in braking area.As long as occurring in the time terminated to failure in failure, movement
There is data point to fall into area, that is, shows to meet bus differential protecting criterion, bus differential protecting can be acted correctly.Fig. 5 is again
Demonstrate the conclusion that we obtain from Fig. 4, i.e., two inlet wires with electronic mutual inductor protect, three outlet electromagnetic transformers
In the case of protection, if troubles inside the sample space occurs, bus differential protecting can be acted correctly.
S4.1.1.3 is obtained according to step S4.1.1.1 and S4.1.1.2 in the protection of two inlet wire electronic mutual inductors, three
In the case of outlet is protected with electromagnetic transformer, if troubles inside the sample space occurs, bus differential protecting can be acted correctly.
S4.1.2 carries out simulation analysis to second of protection type；
Troubles inside the sample space (at K1) occurs at this time, primary current waveform and secondary current waveform are as shown in Figure 6 and Figure 7.
Compare two width figures it can be found that operate normally when inlet wire and outlet the equal very little of load current, primary current size
In 1kA or so, for secondary current size in 1A or so, inlet wire current and outlet current phase are reversed.
When A phase ground short circuit occurring at K1, that is, when troubles inside the sample space occurs, inlet wire current and outlet current phase are in the same direction.
Inlet wire and the electric current of outlet increase, and the primary current of inlet wire sharply increases to 27.5kA, are then influenced by attenuating dc component, pass through
Two cycles, are down to 19.7kA；The primary current of outlet increases to 2.9kA, then the shadow by slight attenuating dc component
It rings, by two cycles, is down to 2.0kA.Inlet wire first sharply increases to 20.5A by the secondary current of electronic mutual inductor, then by
Attenuating dc component influences, and by two cycles, is down to 15.7A；Inlet wire is by the secondary current of electromagnetic transformer first
Serious saturated phenomenon is occurred as soon as in a cycle, secondary current waveform is saturated in asymmetric waveform after saturation, and distortion occurs mainly in
Near the peak value of side, and saturation is exited near the peak value of the other side；Outlet first increases by the secondary current of electromagnetic transformer
3.0A is arrived greatly, is then influenced by slight attenuating dc component, by two cycles, is down to 2.2A.
At the end of failure, inlet wire by the secondary current of electronic mutual inductor there are apparent smearing, when continuing
Between about 0.02s, size of current is about 6.2A.There are slight hangover effects by the secondary current of electromagnetic transformer for inlet wire
It answers, the duration is about 0.015s, and size of current is about 2.0A.After smearing, and it is restored to normal operating condition.
Troubles inside the sample space stalling current I is calculated using Matlab in conjunction with step S1.1 and step S3 in S4.1.2.1resWith
Difference current IdAnd troubles inside the sample space stalling current and difference current are compared and analyzed；
Still K=0.6, I are enabledd0=3A, is calculated I in the same waydAnd Ires, then obtain area shown in Fig. 8
Internal fault stalling current and action current comparison diagram.From Fig. 8 it will be seen that in failure phase action current and braking electricity
Stream is not much different, hence it is evident that the bus differential protecting operating criterion K I set higher than usres, bus differential protecting can be correct
Movement, there is no be seriously saturated to be influenced by the electromagnetic transformer generation on inlet wire.
S4.1.2.2 obtains the ratio of troubles inside the sample space bus differential protecting in conjunction with step S1.2 and step S4.1.2.1, and
Analyze troubles inside the sample space bus differential protecting broken line ratio-restrained characteristic figure.
Then with IresFor X-axis, with IdFor Y-axis, it is special to obtain troubles inside the sample space bus differential protecting ratio brake shown in Fig. 9
Property figure.Fig. 9 demonstrates the conclusion that we obtain from Fig. 8 again, i.e., is protected in an inlet wire with electronic mutual inductor, an inlet wire with
In the case of three outlets are protected with electromagnetic transformer, if troubles inside the sample space occurs, bus differential protecting can be acted correctly.
S4.1.2.3 obtains and protected in an inlet wire with electronic mutual inductor according to step S4.1.2.1 and S4.1.2.2, one
In the case of inlet wire and three outlets are protected with electromagnetic transformer, if troubles inside the sample space occurs, bus differential protecting being capable of positive positive motion
Make.
S4.2, external area error
When carrying out external area error emulation, there are two types of type is protected, the first is that two inlet wires are protected with electronic mutual inductor,
Three outlets are protected with electromagnetic transformer, and second is that two inlet wires are protected with an outlet with electronic mutual inductor, two outlet electricity consumptions
The protection of magnetic-type mutual inductor；
S4.2.1 carries out simulation analysis to the first protection type；
When external area error (at K2) occurs, primary current waveform and secondary current waveform are as shown in Figure 10 and Figure 11.
Compare two width figures it can be found that operate normally when inlet wire and outlet the equal very little of load current, primary current size
In 1kA or so, for secondary current size in 1A or so, inlet wire current and outlet current phase are reversed.
When A phase ground short circuit occurring at K2, that is, when external area error occurs, inlet wire current and non-faulting outlet current phase
In the same direction, the current phase of failure outlet b2 occurs reversed.Inlet wire and the electric current of outlet increase, and the primary current of inlet wire sharply increases to
27.4kA is then influenced by attenuating dc component, by two cycles, is down to 19.6kA；The primary current of non-faulting outlet increases
2.8kA is arrived greatly, is then influenced by slight attenuating dc component, by two cycles, is down to 2.0kA；Failure outlet
Primary current increases to 60.5kA, is then influenced by attenuating dc component, by two cycles, is down to 43.1kA.Inlet wire passes through
The secondary current of electronic mutual inductor first sharply increases to 20.5A, is then influenced by attenuating dc component, by two cycles, is down to
15.6A；Non-faulting outlet first increases to 3.0A by the secondary current of electromagnetic transformer, then by slight decaying dc
The influence of component is down to 2.2A by two cycles；Failure outlet is by the secondary current of electromagnetic transformer in the first week
Serious saturated phenomenon is occurred as soon as in wave, secondary current waveform is saturated in asymmetric waveform after saturation, and distortion occurs mainly in side
Peak value near, and saturation is exited near the peak value of the other side.
At the end of failure, inlet wire by the secondary current of electronic mutual inductor there are apparent smearing, when continuing
Between about 0.02s, size of current is about 6.2A.Failure outlet b2 exists light by the secondary current of electromagnetic type electromagnetic transformer
Micro- smearing, duration are about 0.014s, and size of current is about 3.8A.After smearing, and it is restored to normal
Operating status.
External area error stalling current I is calculated using Matlab in conjunction with step S1.3 and step S3 in S4.2.1.1resWith
Difference current IdAnd external area error stalling current and difference current are compared and analyzed.
Still K=0.6, I are enabledd0=3A, is calculated I in the same waydAnd Ires, then obtain area shown in Figure 12
Internal fault stalling current and action current comparison diagram.It will be seen that having one in failure phase action current from Figure 12
Divide and is higher than the bus differential protecting operating criterion KI that we setres, bus differential protecting can occur malfunction movement.
S4.2.1.2 obtains the ratio of external area error bus differential protecting in conjunction with step S1.3 and step S4.2.1.1, and
The outer fault bus differential protection broken line ratio-restrained characteristic figure of analysis area.
Then with IresFor X-axis, with IdFor Y-axis, the spy of external area error bus differential protecting ratio brake shown in Figure 13 is obtained
Property figure.The chart is bright in failure process, and still some data point is fallen into active region, meets bus differential protecting criterion.
Figure 13 demonstrates the conclusion that we obtain from Figure 12 again, i.e., is protected in two inlet wires with electronic mutual inductor, three outlet electricity consumptions
In the case of the protection of magnetic-type mutual inductor, if external area error occurs, bus differential protecting may be malfunctioned, this is gone out by failure
Caused by serious saturation occurs for the electromagnetic transformer on line.
S4.2.1.3 is obtained according to step S4.2.1.1 and S4.2.1.2 in the protection of two inlet wire electronic mutual inductors, three
In the case of outlet is protected with electromagnetic transformer, if external area error occurs, bus differential protecting has the possibility malfunctioned,
This is caused by serious saturation occurs as the electromagnetic transformer in failure outlet.
S4.2.2 carries out simulation analysis to second of protection type.
When external area error (at K2) occurs, in order to investigate whether bus differential protecting will appear malfunction, we will be former
The electronic mutual inductor of barrier outlet is replaced with desired electrical minor mutual inductor, obtains primary current waveform and secondary current waveform as schemed
Shown in 14 and Figure 15.
Compare two width figures it can be found that operate normally when inlet wire and outlet the equal very little of load current, primary current size
In 1kA or so, for secondary current size in 1A or so, inlet wire current and outlet current phase are reversed.
When A phase ground short circuit occurring at K2, that is, when external area error occurs, inlet wire current and non-faulting outlet current phase
In the same direction, the current phase of failure outlet b2 occurs reversed.Inlet wire and the electric current of outlet increase, and the primary current of inlet wire sharply increases to
27.5kA is then influenced by attenuating dc component, by two cycles, is down to 19.8kA；The primary current of non-faulting outlet increases
2.9kA is arrived greatly, is then influenced by slight attenuating dc component, by two cycles, is down to 2.0kA；Failure outlet
Primary current increases to 60.8kA, is then influenced by attenuating dc component, by two cycles, is down to 43.7kA.Inlet wire passes through
The secondary current of electronic mutual inductor first sharply increases to 20.8A, is then influenced by attenuating dc component, by two cycles, is down to
15.7A；Non-faulting outlet first increases to 3.0A by the secondary current of electromagnetic type electromagnetic transformer, is then declined by slight
The influence for subtracting DC component is down to 2.1A by two cycles；The secondary current of desired electrical minor mutual inductor is passed through in failure outlet
First sharply increase to 60.3A, then influenced by attenuating dc component, by two cycles, is down to 43.9A.
At the end of failure, inlet wire by the secondary current of electronic mutual inductor there are apparent smearing, when continuing
Between about 0.02s, size of current is about 6.2A.After smearing, and it is restored to normal operating condition.
External area error stalling current I is calculated using Matlab in conjunction with step S1.3 and step S3 in S4.2.1.1resWith
Difference current IdAnd external area error stalling current and difference current are compared and analyzed.
Still K=0.6, I are enabledd0=3A, is calculated I in the same waydAnd Ires, then obtain area shown in Figure 16
Internal fault stalling current and action current comparison diagram.It is female from Figure 16 it will be seen that in failure phase action current very little
Line differential protection should be reliably failure to actuate.But due to there is few a part to set in fault current waveform close to us
Bus differential protecting operating criterion KIres, the deterioration of sensitivity of bus differential protecting, have it is small interference or other more
In complicated system or even under actual condition, bus differential protecting is likely to occur malfunction.
S4.2.1.2 obtains the ratio of external area error bus differential protecting in conjunction with step S1.3 and step S4.2.1.1, and
The outer fault bus differential protection broken line ratio-restrained characteristic figure of analysis area；
Enable ratio brake coefficientObtain ratio brake coefficient figure shown in Figure 17.We can from figure
Arrive, the peak value of ratio brake coefficient K demonstrates the conclusion that we obtain from Figure 16 very close to ratio K again, i.e., two into
Line is protected with an outlet with electronic mutual inductor, in the case of two outlets are protected with electromagnetic transformer, if external area error occurs, though
So in the example, bus differential protecting is reliably failure to actuate, but its deterioration of sensitivity, have it is small interference or at other it is more multiple
In miscellaneous system or even under actual condition, bus differential protecting is likely to occur malfunction.
S4.2.1.3 is obtained according to step S4.2.1.1 and S4.2.1.2 in two inlet wires and an outlet electronic type mutual inductance
Device protection, in the case of two outlets are protected with electromagnetic transformer, if external area error occurs, bus differential protecting is malfunctioned
Possibility.
S4.3, line outlet failure
When simulated line exports failure, the protection type of use is that inlet wire is protected with electronic mutual inductor, and outlet is equal
It is protected with electromagnetic transformer；Primary current waveform and secondary current waveform are as shown in Figure 18 and Figure 19.
Compare two width figures it can be found that operate normally when inlet wire and outlet the equal very little of load current, primary current size
In 1kA or so, for secondary current size in 1A or so, inlet wire current and outlet current phase are reversed.
When A phase ground short circuit occurring at K3, that is, when line outlet failure occurs, inlet wire current and non-faulting go out line current
Phase is in the same direction, and the current phase of failure outlet b2 occurs reversely, and inlet wire current goes out line current with three and there is phase difference.
Inlet wire and the electric current of outlet increase, and the primary current of inlet wire increases to 1.6kA, then by attenuating dc component shadow
It rings, by two cycles, is down to 1.3kA；The primary current of non-faulting outlet b1 and b3 slightly increase, and are barely affected；Therefore
The primary current of barrier outlet b2 increases to 3.0kA, is then influenced by attenuating dc component, by two cycles, is down to 2.3kA.
Inlet wire first increases to 1.2A by the secondary current of electronic mutual inductor, is then influenced by attenuating dc component, passes through
Two cycles are crossed, 1.1A is down to；The primary current of failure outlet b1 and b3 slightly increase, and are barely affected；Failure outlet b2
3.0A is first increased to by the secondary current of electromagnetic transformer, is then influenced by attenuating dc component, by two cycles, drop
To 2.3A.
Line outlet failure stalling current I is calculated using Matlab in conjunction with step S1.1 and step S3 in S4.3.1res
With difference current IdAnd troubles inside the sample space stalling current and difference current are compared and analyzed；
Still K=0.6, I are enabledd0=3A, is calculated I in the same waydAnd Ires, then obtain area shown in Figure 20
Internal fault stalling current and action current comparison diagram.
S4.3.2 obtains the ratio of line outlet fault bus differential protection in conjunction with step S1.3 and step S4.3.1, and
Analysis circuit exports fault bus differential protection broken line ratio-restrained characteristic figure；
External area error bus differential protecting ratio-restrained characteristic figure is as shown in figure 21.The chart is bright in entire failure process
In, the equal very little of action current, much smaller than minimum working current (movement threshold) I of difference currentd0, that is, it is unsatisfactory for bus differential guarantor
Criterion is protected, bus differential protecting is reliably failure to actuate.
S4.3.3 obtains in entire failure process according to step S4.3.1 and S4.3.2, the equal very little of action current, far
Less than the minimum working current I of difference currentd0, that is to say, that it is unsatisfactory for bus differential protecting criterion, bus differential protecting is reliable
It is failure to actuate.
Present invention utilizes the bus differential protectings established under PSCAD environment to emulate mould, by event outside troubles inside the sample space, area
Situations such as barrier and line outlet failure, is emulated respectively, studies electronic type (electronic mutual inductor), electromagnetic current transducer
Bus differential protecting action performance under cooperating.Simulation result shows the input and output following feature of electronic mutual inductor
Preferably, although smearing can be generated when troubles inside the sample space and external area error occurs, the criterion to bus differential protecting is sentenced
Disconnected upper influence is little.And due to the limitation of integrating circuit time constant in Rogowski coil current transformer, smearing exists
Time it is shorter, usually decay in 1~1.5 cycle and finish, therefore for back-up protection, the application such as reclosing technology does not have
It influences.When troubles inside the sample space occurs, if will appear serious saturated phenomenon, waveform using electromagnetic transformer on inlet wire
Severely deformed, input and output following feature is bad, cannot restore the current signal of primary side well, but bus differential is protected at this time
Shield can be acted correctly, be not affected by.And when external area error occurs, if using electromagnetic type mutual inductance in outlet
Device also will appear serious saturated phenomenon, and waveform is severely deformed, and input and output following feature is bad, cannot restore well primary
The current signal of side, bus differential protecting, which is affected by, at this time to malfunction, at this time electricity the case where malfunction with routine
It is identical that the case where malfunction occurs in magnetic-type mutual inductor, therefore, will not be as mixing access mutual inductor in the case of, the malfunction that newly introduces
To consider.
Described above is only presently preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of analysis electronic mutual inductor and electromagnetic transformer cooperate the method influenced on system protection, which is characterized in that
Steps are as follows: S1, gives the calculation formulae for related parameters of bus differential protecting；
The relevant parameter includes Protection criteria, action current, stalling current and ratio；
S2 establishes bus differential protecting model using PSCAD software；
The bus differential protecting model, two inlet wires including left side, the initial phase angle of power supply is 0 °；Three of right side go out
Line, respectively first outlet, Article 2 outlet and Article 3 outlet, first outlet, Article 2 outlet and Article 3 outlet
The initial phase angle of power supply be followed successively by 10 °, 20 ° and 30 °；And troubles inside the sample space point K1, external area error point K2 and line outlet event are set
Hinder point K3 and fault type, time of fault inception and trouble duration；
S3 obtains the difference current I of bus differential protecting according to step S2dWith stalling current Ires:
S4 carries out simulation analysis to three kinds of fault points respectively；
S4.1, troubles inside the sample space
When carrying out troubles inside the sample space emulation, there are two types of type is protected, the first is that two inlet wires are protected with electronic mutual inductor, and three go out
Line is protected with electromagnetic transformer, and second is that an inlet wire is protected with electronic mutual inductor, another inlet wire and three outlets
Protected with electromagnetic transformer；
S4.1.1 carries out simulation analysis to the first protection type；
S4.1.2 carries out simulation analysis to second of protection type；
S4.2, external area error；
When carrying out external area error emulation, there are two types of type is protected, the first is that two inlet wires are protected with electronic mutual inductor, and three go out
Line is protected with electromagnetic transformer, and second is that two inlet wires are protected with an outlet with electronic mutual inductor, two outlet electromagnetic types
Mutual inductor protection；
S4.2.1 carries out simulation analysis to the first protection type；
S4.2.2 carries out simulation analysis to second of protection type；
S4.3, line outlet failure；
When simulated line exports failure, the protection type of use is that inlet wire is protected with electronic mutual inductor, the equal electricity consumption of outlet
The protection of magnetic-type mutual inductor.
2. analysis electronic mutual inductor according to claim 1 and electromagnetic transformer cooperate the side influenced on system protection
Method, which is characterized in that in step sl, specific steps are as follows: S1.1, if there is n branch on single supply single busbar, corresponding current point
It is notThe then Protection criteria of single busbar are as follows:
S1.2 gives action current of the bus differential protecting in troubles inside the sample spaceStalling currentAnd the calculating of ratio K
Formula:
Wherein,For the electric current of nth branch, andElectric current is after transient state saturation occurs for TA
S1.3 gives action current of the bus differential protecting in external area errorStalling currentAnd the calculating of ratio K
Formula:
Wherein,Fault current when external area error occurs for nth branch, electric current is after transient state saturation occurs for TA
3. analysis electronic mutual inductor according to claim 2 and electromagnetic transformer cooperate the side influenced on system protection
Method, which is characterized in that in step S4.1.1, specific steps are as follows: S4.1.1.1 is utilized in conjunction with step S1.1 and step S3
Troubles inside the sample space stalling current I is calculated in MatlabresWith difference current IdAnd to troubles inside the sample space stalling current and difference current into
Row comparative analysis；
S4.1.1.2 obtains the ratio of troubles inside the sample space bus differential protecting in conjunction with step S1.2 and step S4.1.1.1, and analyzes
Troubles inside the sample space bus differential protecting broken line ratio-restrained characteristic figure；
S4.1.1.3 is obtained according to step S4.1.1.1 and S4.1.1.2 in the protection of two inlet wire electronic mutual inductors, three outlets
In the case of being protected with electromagnetic transformer, if troubles inside the sample space occurs, bus differential protecting can be acted correctly.
4. analysis electronic mutual inductor according to claim 2 and electromagnetic transformer cooperate the side influenced on system protection
Method, which is characterized in that in step S4.1.2, specific steps are as follows: S4.1.2.1 is utilized in conjunction with step S1.1 and step S3
Troubles inside the sample space stalling current I is calculated in MatlabresWith difference current Id, and to troubles inside the sample space stalling current and difference current
It compares and analyzes；
S4.1.2.2 obtains the ratio of troubles inside the sample space bus differential protecting in conjunction with step S1.2 and step S4.1.2.1, and analyzes
Troubles inside the sample space bus differential protecting broken line ratio-restrained characteristic figure；
S4.1.2.3 obtains and protected in an inlet wire with electronic mutual inductor according to step S4.1.2.1 and S4.1.2.2, an inlet wire
In the case of being protected with three outlets with electromagnetic transformer, if troubles inside the sample space occurs, bus differential protecting can be acted correctly.
5. analysis electronic mutual inductor according to claim 2 and electromagnetic transformer cooperate the side influenced on system protection
Method, which is characterized in that in step S4.2.1, specific steps are as follows: S4.2.1.1 is utilized in conjunction with step S1.3 and step S3
External area error stalling current I is calculated in MatlabresWith difference current IdAnd to external area error stalling current and difference current into
Row comparative analysis；
S4.2.1.2 obtains the ratio of external area error bus differential protecting in conjunction with step S1.3 and step S4.2.1.1, and analyzes
External area error bus differential protecting broken line ratio-restrained characteristic figure；
S4.2.1.3 is obtained according to step S4.2.1.1 and S4.2.1.2 in the protection of two inlet wire electronic mutual inductors, three outlets
In the case of being protected with electromagnetic transformer, if external area error occurs, bus differential protecting has the possibility malfunctioned, this is
Occurred caused by serious saturation as the electromagnetic transformer in failure outlet.
6. analysis electronic mutual inductor according to claim 2 and electromagnetic transformer cooperate the side influenced on system protection
Method, which is characterized in that in step S4.2.2, specific steps are as follows: S4.2.2.1 is utilized in conjunction with step S1.3 and step S3
External area error stalling current I is calculated in MatlabresWith difference current IdAnd to external area error stalling current and difference current into
Row comparative analysis；
S4.2.2.2 obtains the ratio of external area error bus differential protecting in conjunction with step S1.3 and step S4.2.2.1, and analyzes
External area error bus differential protecting broken line ratio-restrained characteristic figure；
S4.2.2.3 is obtained and is protected with an outlet with electronic mutual inductor in two inlet wires according to step S4.2.2.1 and S4.2.2.2
Shield, in the case of two outlets are protected with electromagnetic transformer, if occur external area error, bus differential protecting have malfunction can
Energy.
7. analysis electronic mutual inductor according to claim 2 and electromagnetic transformer cooperate the side influenced on system protection
Method, which is characterized in that in step S4.3, specific steps are as follows: S4.3.1 utilizes Matlab in conjunction with step S1.1 and step S3
Line outlet failure stalling current I is calculatedresWith difference current IdAnd to line outlet failure stalling current and difference current
It compares and analyzes；
S4.3.2 obtains the ratio of line outlet fault bus differential protection in conjunction with step S1.3 and step S4.3.1, and analyzes
Line outlet fault bus differential protection broken line ratio-restrained characteristic figure；
S4.3.3 show in entire failure process that the equal very little of action current is much smaller than according to step S4.3.1 and S4.3.2
The minimum working current I of difference currentd0, that is to say, that it is unsatisfactory for bus differential protecting criterion, bus differential protecting is reliably motionless
Make.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101609980A (en) * | 2009-07-22 | 2009-12-23 | 天津市电力公司 | Electric mutual inductor and electromagnetic transformer cooperate realizes the circuit optical fiber longitudinal differential protection method |
| CN102751708A (en) * | 2011-04-20 | 2012-10-24 | 南京南瑞继保电气有限公司 | Self-adaptive sampling delay compensation method of differential protection |
| CN103683216A (en) * | 2013-11-25 | 2014-03-26 | 许继电气股份有限公司 | Busbar differential protection method |
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| GB0127745D0 (en) * | 2001-11-20 | 2002-01-09 | Alstom | Protection of double circuit power lines |
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|---|---|---|---|---|
| CN101609980A (en) * | 2009-07-22 | 2009-12-23 | 天津市电力公司 | Electric mutual inductor and electromagnetic transformer cooperate realizes the circuit optical fiber longitudinal differential protection method |
| CN102751708A (en) * | 2011-04-20 | 2012-10-24 | 南京南瑞继保电气有限公司 | Self-adaptive sampling delay compensation method of differential protection |
| CN103683216A (en) * | 2013-11-25 | 2014-03-26 | 许继电气股份有限公司 | Busbar differential protection method |
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| 电磁式和光电式电流互感器混用对线路差动保护影响的研究;王锬;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20160815(第08期);全文 |
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