CN103269055B - Protective relaying device and method - Google Patents
Protective relaying device and method Download PDFInfo
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- CN103269055B CN103269055B CN201310222222.3A CN201310222222A CN103269055B CN 103269055 B CN103269055 B CN 103269055B CN 201310222222 A CN201310222222 A CN 201310222222A CN 103269055 B CN103269055 B CN 103269055B
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Abstract
The invention provides a kind of protective relaying device and method, measure all three-phase conductors including each measurement module and synthesize analog parameter or magnetic induction synthesis analog parameter relative to its magnetic field intensity；Each magnetic field intensity synthesis analog parameter or magnetic induction synthesis analog parameter are converted to magnetic field intensity digital parameters or magnetic induction digital parameters by signal conversion module；Comparison module is when magnetic field intensity digital parameters or magnetic induction digital parameters exceed magnetic field intensity threshold value or magnetic induction threshold value, after time delay module carries out time delay, judge that whether comparative result is the fault of real power system or abnormal state causes, the most then notify calling module；Calling module sends described fault or abnormal state signal to switch board；Switch board sends tripping operation or alarm signal.The present invention can solve the problem that current cable in current relay protection of power system is oversize and the drawback of easy malfunction, accurately acquires the failure condition of power system, and reports to the police in time.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, particularly to a kind of protective relaying device and method.
Background technology
Power system the most usually causes the accident because of the overcurrent protection generation misoperation in system, gives economy
Bring huge loss.Overcurrent protection mainly includes short-circuit protection and overload protection two types.The feature of short-circuit protection is
Setting current is big, snap action.Electromagnetic type current release (or relay), fuse are commonly used for short circuit protection component.Overload
The feature of protection is that setting current is less, inverse time-delay operation.Thermorelay, time lagged type electromagnetic type current relay are commonly used for overload
Protection element.When flow through by protection original paper in electric current exceed certain numerical value adjusted in advance time, protection device start, make open circuit
Device trips or provides alarm signal.
Existing current protective device is made up of, due to from scene electric current relay, current cable, relay protection cabinet etc.
Current transformer is to relay protection cabinet distant (general hundreds of rice), and resistance is relatively big, is lost bigger.The more important thing is the most remote
Distance so that cable is easy to be out of order, and as being cut, causes the misoperation of protective relaying device.
Summary of the invention
It is an object of the invention to provide a kind of protective relaying device and method, it is possible to solve current power system relay and protect
Protect that middle current cable is oversize and the drawback of easy malfunction, accurately acquire the failure condition of power system, and report in time
Alert.
For solving the problems referred to above, the present invention provides a kind of protective relaying device, including:
Laying respectively at three measurement modules of the underface of each three-phase conductor on the wire of power system, two adjacent
The distance between distance and two adjacent measurement modules between three-phase conductor is equal, each three-phase conductor and the survey immediately below it
Distance between amount module is equal, and each measurement module synthesizes mould for measuring all three-phase conductors relative to its magnetic field intensity
Intend parameter or magnetic induction synthesis analog parameter；
Signal conversion module, for turning each magnetic field intensity synthesis analog parameter or magnetic induction synthesis analog parameter
It is changed to magnetic field intensity digital parameters or magnetic induction digital parameters；
Time delay module, is used for carrying out time delay；
Comparison module, for by every phase magnetic field intensity digital parameters (corresponding each phase current) respectively with a magnetic field intensity threshold
Value compares, or by every phase magnetic induction digital parameters (corresponding each phase current) with a magnetic induction threshold ratio relatively, works as magnetic
When field intensity digital parameters or magnetic induction digital parameters exceed described magnetic field intensity threshold value or magnetic induction threshold value, in institute
State after time delay module carries out time delay, it is judged that whether the comparative result exceeding described magnetic field intensity threshold value or magnetic induction threshold value is
Fault or the abnormal state of real power system cause, the most then notify a calling module；
Described calling module, for sending described fault or abnormal state signal according to described notice to a switch board；
Described switch board, for sending warning or trip signal according to described fault or abnormal state signal.
Further, in said apparatus, when described switch board receives fault-signal, described switch board sends warning
Signal, and send trip signal to the chopper of power system；When described switch board receives abnormal state signal, described
Switch board sends alarm signal.
Further, in said apparatus, described signal conversion module to be also respectively relative to according to all three-phase conductors
Magnetic field intensity synthesis analog parameter or the magnetic induction synthesis analog parameter of each measurement module generate each three-phase conductor and divide
Do not synthesize the component of analog parameter or dividing of magnetic induction synthesis analog parameter relative to the magnetic field intensity of each measurement module
Amount, and the component of each magnetic field intensity synthesis analog parameter or the component of magnetic induction synthesis analog parameter are converted to magnetic field
The component of strength figures parameter or the component of magnetic induction digital parameters, and according to all magnetic field intensities synthesis analog parameter
The component of component or all magnetic induction synthesis analog parameter obtains the current parameters of three-phase conductor.
Further, in said apparatus, described signal conversion module is obtained by law of electromagnetic induction formula ∫ Hdl=∑ I
Take the current parameters of each three-phase conductor, or by obtaining each according to formula B=μ H and law of electromagnetic induction formula ∫ Hdl=∑ I
The current parameters of three-phase conductor, wherein, H represents magnetic field intensity parameter, and I represents that current parameters, B represent magnetic induction parameter, μ
Pcrmeability for medium.
Further, in said apparatus, described comparison module, it is additionally operable to described current parameters and current threshold ratio
Relatively, when current parameters exceedes described current threshold, after described time delay module carries out time delay, it is judged that exceed described current threshold
Comparative result be whether the fault of real power system or abnormal state causes, the most then notify described calling module.
Another side according to the present invention, it is provided that a kind of relay protecting method, uses above-mentioned protective relaying device, described side
Method includes:
It is strong relative to its magnetic field intensity synthesis analog parameter or magnetic induction that each measurement module measures all three-phase conductors
Degree synthesis analog parameter；
Each magnetic field intensity synthesis analog parameter or magnetic induction synthesis analog parameter are converted to by signal conversion module
Magnetic field intensity digital parameters or magnetic induction digital parameters；
Comparison module by every phase magnetic field intensity digital parameters (corresponding each phase current) respectively with a magnetic field intensity threshold ratio
Relatively, or by every phase magnetic induction digital parameters (corresponding each phase current) with a magnetic induction threshold ratio relatively, when magnetic field is strong
When degree digital parameters or magnetic induction digital parameters exceed described magnetic field intensity threshold value or magnetic induction threshold value, at time delay mould
After block carries out time delay, comparison module judges that whether the comparative result exceeding described magnetic field intensity threshold value or magnetic induction threshold value is
Fault or the abnormal state of real power system cause, the most then notify calling module；
Described calling module sends described fault or abnormal state signal according to described notice to a switch board；
Described switch board sends warning or trip signal according to described fault or abnormal state signal.
Further, in the above-mentioned methods, described switch board sends warning according to described fault or abnormal state signal
Or the step of trip signal includes, when described switch board receives fault-signal, described switch board sends alarm signal, and to
The chopper of power system sends trip signal；When described switch board receives abnormal state signal, described switch board is sent out
Go out alarm signal.
The present invention also provides for another kind of relay protecting method, uses above-mentioned protective relaying device, described method to include:
It is strong relative to its magnetic field intensity synthesis analog parameter or magnetic induction that each measurement module measures all three-phase conductors
Degree synthesis analog parameter；
Signal conversion module is respectively relative to the magnetic field intensity synthesis simulation of each measurement module according to all three-phase conductors
Parameter or magnetic induction synthesis analog parameter generate each three-phase conductor and are respectively relative to the magnetic field intensity of each measurement module
The component of synthesis analog parameter or the component of magnetic induction synthesis analog parameter, and each magnetic field intensity is synthesized analog parameter
Component or the component of magnetic induction synthesis analog parameter be converted to component or the magnetic induction of magnetic field intensity digital parameters
The component of digital parameters, and component or all magnetic induction synthesis simulation ginseng of analog parameter is synthesized according to all magnetic field intensities
The component of number obtains the current parameters of three-phase conductor；
Described current parameters and a current threshold are compared by comparison module, when current parameters exceedes described current threshold,
After time delay module carries out time delay, it is judged that the electric power system fault whether comparative result exceeding described current threshold is real draws
Rise, the most then notify described calling module；
Described calling module sends described fault or abnormal state signal according to described notice to a switch board；
Described switch board sends warning or trip signal according to described fault or abnormal state signal.
Further, in the above-mentioned methods, described switch board sends warning according to described fault or abnormal state signal
Or the step of trip signal includes, when described switch board receives fault-signal, described switch board sends alarm signal, and to
The chopper of power system sends trip signal；When described switch board receives abnormal state signal, described switch board is sent out
Go out alarm signal.
Further, in the above-mentioned methods, signal conversion module is according to the component of all magnetic field intensities synthesis analog parameter
Or in the step of the component of all magnetic induction synthesis analog parameter current parameters that obtains each three-phase conductor, described signal
Modular converter obtains the current parameters of each three-phase conductor by law of electromagnetic induction formula ∫ Hdl=∑ I, or by according to formula
B=μ H and law of electromagnetic induction formula ∫ Hdl=∑ I obtains the current parameters of each three-phase conductor, and wherein, H represents that magnetic field intensity is joined
Number, I represents that current parameters, B represent magnetic induction parameter, and μ is the pcrmeability of medium.
Compared with prior art, the present invention by lay respectively at each three-phase conductor on the wire of power system just under
Three measurement modules of side, the distance between distance and two adjacent measurement modules between two adjacent three-phase conductors is equal,
Distance between each three-phase conductor and the measurement module immediately below it is equal, and each measurement module is used for measuring all three-phases leads
Body synthesizes analog parameter or magnetic induction synthesis analog parameter relative to its magnetic field intensity；Signal conversion module, being used for will
Each magnetic field intensity synthesis analog parameter or magnetic induction synthesis analog parameter are converted to magnetic field intensity digital parameters or magnetic strength
Answer strength figures parameter；Time delay module, is used for carrying out time delay；Comparison module, for (corresponding by every phase magnetic field intensity digital parameters
Each phase current) respectively with a magnetic field intensity threshold ratio relatively, or by every phase magnetic induction digital parameters (corresponding each phase electricity
Stream) with a magnetic induction threshold ratio relatively, when magnetic field intensity digital parameters or magnetic induction digital parameters exceed described magnetic field
When intensity threshold or magnetic induction threshold value, after described time delay module carries out time delay, it is judged that exceed described magnetic field intensity threshold value
Or whether the comparative result of magnetic induction threshold value is the fault of real power system or abnormal state causes, the most then
Notify a calling module；Described calling module, for sending described fault or abnormal shape according to described notice to a switch board
State signal；Described switch board, for sending warning or trip signal according to described fault or abnormal state signal, it is possible to solve
At present in relay protection of power system, current cable is oversize and the drawback of easy malfunction, accurately acquires the fault of power system
Situation, and report to the police in time.
Accompanying drawing explanation
Fig. 1 is the module map of the protective relaying device of the embodiment of the present invention one；
Fig. 2 is the three-phase schematic diagram of the protective relaying device of the embodiment of the present invention one；
Fig. 3 is the single-phase schematic diagram of the protective relaying device of the embodiment of the present invention one；
Fig. 4 is the measurement module a magnetic induction schematic diagram of the protective relaying device of the embodiment of the present invention one；
Fig. 5 is the flow chart of the relay protecting method of the embodiment of the present invention two；
Fig. 6 is the flow chart of the relay protecting method of the embodiment of the present invention three.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, real with concrete below in conjunction with the accompanying drawings
The present invention is further detailed explanation to execute mode.
Embodiment one
As it is shown in figure 1, the present invention provides a kind of protective relaying device, including:
Lay respectively at three the measurement module a of underface of each three-phase conductor A, B, C on the wire of power system, b,
C, two adjacent distances between three-phase conductor A, B, C and two adjacent distances between measurement module a, b, c are equal, Mei Gesan
Distance between phase conductor A, B, C and measurement module a, b, c immediately below it is equal, and each measurement module a, b, c are used for measuring
All three-phase conductor A, B, C synthesize analog parameter or magnetic induction synthesis analog parameter relative to its magnetic field intensity, specifically
, as in figure 2 it is shown, A, B, C are three-phase conductor, arranged in parallel, at a distance of for r, measurement module a, b, c are three-phase at A, B, C respectively
The underface of conductor, distance is d, as a example by measurement module a, a to A, B, C conductor distance as it is shown on figure 3, then fixed according to the right hand
Then, the vector of magnetic induction at measurement module a can be drawn；
Signal conversion module 2, for by each magnetic field intensity synthesis analog parameter H or magnetic induction synthesis analog parameter
B(B=μ H) be converted to magnetic field intensity digital parameters or magnetic induction digital parameters；
Comparison module 3, for by every phase magnetic field intensity digital parameters (corresponding each phase current) respectively with a magnetic field intensity
Threshold ratio relatively, or by every phase magnetic induction digital parameters (corresponding each phase current) and a magnetic induction threshold ratio relatively, when
When magnetic field intensity digital parameters or magnetic induction digital parameters exceed described magnetic field intensity threshold value or magnetic induction threshold value,
After described time delay module carries out time delay, it is judged that whether exceed the comparative result of described magnetic field intensity threshold value or magnetic induction threshold value
It is that fault or the abnormal state of real power system causes, the most then notifies a calling module；
Time delay module 4, is used for carrying out time delay；
Described calling module 5 is for sending described fault or abnormal state signal according to described notice to a switch board.
Concrete, calling module 5 can send information to switch board 6 by wireless device, after switch board 6 receives described alarm signal, and can
Remind monitoring personnel.
Described switch board 6, for sending warning or trip signal according to described fault or abnormal state signal.
Optionally, when described switch board receives fault-signal, described switch board sends alarm signal, and to power train
The chopper of system sends trip signal；When described switch board receives abnormal state signal, described switch board sends warning
Signal.
Optionally, described signal conversion module 2 is also respectively relative to each measurement module with according to all three-phase conductors
Magnetic field intensity synthesis analog parameter or magnetic induction synthesis analog parameter generate each three-phase conductor and are respectively relative to each survey
The component of the magnetic field intensity synthesis analog parameter of amount module or the component of magnetic induction synthesis analog parameter, and by each magnetic field
The component of intensity synthesis analog parameter or the component of magnetic induction synthesis analog parameter are converted to magnetic field intensity digital parameters
Component or the component of magnetic induction digital parameters, and synthesize the component of analog parameter or all magnetic strengths according to all magnetic field intensities
The component answering intensity synthesis analog parameter obtains the current parameters of each three-phase conductor.
Optionally, described signal conversion module obtains the electricity of each three-phase conductor by law of electromagnetic induction formula ∫ Hdl=∑ I
Stream parameter, or by obtaining the current parameters of each three-phase conductor according to formula B=μ H and law of electromagnetic induction formula ∫ Hdl=∑ I, its
In, H represents magnetic field intensity parameter, and I represents that current parameters, B represent magnetic induction parameter, and μ is the pcrmeability of medium.Concrete, can
According to the law of electromagnetic induction, ∫ Hdl=∑ I(B=μ H), when the current flows, corresponding magnetic field will be induced around it, pass through
Measure the magnetic induction (or magnetic field intensity) in magnetic field, just can draw corresponding electric current.Then by the current value obtained and setting value
Compare, and then judge whether fault, as shown in Figure 4, dAa=dBb=dCc=d, As a example by measurement module a, three-phase conductor A, B, C are regarded as endless wire, then in conductor week
The magnetic field enclosed is symmetrical, then can be by ∫ HAadl=IAsinα,∫HBadl=IBsinβ,∫HCadl=ICSin γ obtains 2 π dAaHAa=IAsin
α, 2 π dBaHBa=IBSin β, 2 π dCaHCa=ICSin γ, and then
(thus can obtain BAa=μHAa, BBa=μHBa, BCa=μHCa)。IA, IB, ICFor flowing through the wink that the maximum of conductor, α, β and γ are electric current
Time phase angle, HAa, HBa, HCaFor instantaneous value, the most each three-phase conductor is respectively relative to the magnetic field intensity synthesis simulation of measurement module a
The component of parameter, according to the right-hand rule, the vector of the component of magnetic field intensity synthesis analog parameter,,It is respectively perpendicular
In dAa, dBa, dCa, withDirection, place is positive direction, then the composite vector of magnetic induction is, it is possible to it is expressed as Ha∠
1, in like manner can obtain And BAb=μHAb, BBb=μHBb, BCb=μHCbAnd BAc=μHAc, BBc=μHBc, BCc=μHCc, can synthesize equally to
Amount,Or Hb∠ 2, Hc∠3。
The component being synthesized analog parameter by the magnetic field intensity of 9 measurement modules can obtain current parameters I with its vectorA, IB, IC
And α, β and γ, and then judge IA, IB, ICWhether exceed setting value, send alarm signal to switch board 6, additionally, it is also possible to right
The method that weighs is to seek IA, IB, ICAnd α, β and γ.
Optionally, described comparison module, it is additionally operable to compare described current parameters and a current threshold, when current parameters surpasses
When crossing described current threshold, after described time delay module carries out time delay, it is judged that whether exceed the comparative result of described current threshold
It is that fault or the abnormal state of real power system causes, the most then notifies described calling module.
Optionally, described time delay module, it is additionally operable to judge whether the comparative result exceeding described current threshold is real
Electric power system fault causes, the most then notify that described calling module sends alarm signal.
The present embodiment can solve the problem that current cable in current relay protection of power system is oversize and the drawback of easy malfunction,
Can correct reaction electric power system fault and abnormal state, and correct carrying out react, as tripped or reporting to the police.
Embodiment two
As it is shown in figure 5, the present invention also provides for a kind of relay protecting method, use the protective relaying device described in embodiment one
Described include:
Step S11, each measurement module measure all three-phase conductors relative to its magnetic field intensity synthesize analog parameter or
Magnetic induction synthesis analog parameter；
Step S12, signal conversion module is by each magnetic field intensity synthesis analog parameter or magnetic induction synthesis simulation ginseng
Number conversion is magnetic field intensity digital parameters or magnetic induction digital parameters；
Step S13, comparison module is by strong with a magnetic field respectively for every phase magnetic field intensity digital parameters (corresponding each phase current)
Spend threshold ratio relatively, or by every phase magnetic induction digital parameters (corresponding each phase current) with a magnetic induction threshold ratio relatively,
When magnetic field intensity digital parameters or magnetic induction digital parameters exceed described magnetic field intensity threshold value or magnetic induction threshold value,
After time delay module carries out time delay, comparison module judges to exceed the comparison knot of described magnetic field intensity threshold value or magnetic induction threshold value
The most whether fruit is the fault of real power system or abnormal state causes, the most then notify calling module；
Step S14, described calling module sends described fault or abnormal state letter according to described notice to a switch board
Number；
Step S15, described switch board sends warning or trip signal according to described fault or abnormal state signal.
Preferably, in the step of step S15, when described switch board receives fault-signal, described switch board sends report
Alert signal, and send trip signal to the chopper of power system；When described switch board receives abnormal state signal, institute
State switch board and send alarm signal.
Other detailed content of the present embodiment specifically can be found in embodiment one, does not repeats them here.
The present embodiment can solve the problem that current cable in current relay protection of power system is oversize and the drawback of easy malfunction,
Can correct reaction electric power system fault and abnormal state, and correct carrying out react, as tripped or reporting to the police.
Embodiment three
As shown in Figure 6, the present invention also provides for another kind of relay protecting method, uses the relay protection as described in embodiment one
Device, described method includes:
Step S21, each measurement module measure all three-phase conductors relative to its magnetic field intensity synthesize analog parameter or
Magnetic induction synthesis analog parameter；
Step S22, signal conversion module is respectively relative to the magnetic field intensity of each measurement module according to all three-phase conductors
Synthesis analog parameter or magnetic induction synthesis analog parameter generate each three-phase conductor and are respectively relative to each measurement module
The component of magnetic field intensity synthesis analog parameter or the component of magnetic induction synthesis analog parameter, and each magnetic field intensity is synthesized
The component of the component of analog parameter or magnetic induction synthesis analog parameter is converted to component or the magnetic of magnetic field intensity digital parameters
The component of induction digital parameters, and component or the conjunction of all magnetic induction of analog parameter is synthesized according to all magnetic field intensities
The component becoming analog parameter obtains the current parameters of each three-phase conductor；
Preferably, signal conversion module synthesizes the component of analog parameter or all magnetic induction according to all magnetic field intensities
In the step of the current parameters that the component of synthesis analog parameter obtains each three-phase conductor, described signal conversion module passes through electromagnetism
Induction law formula ∫ Hdl=∑ I obtains the current parameters of each three-phase conductor, or by fixed according to formula B=μ H and electromagnetic induction
Rule formula ∫ Hdl=∑ I obtains the current parameters of each three-phase conductor, and wherein, H represents magnetic field intensity parameter, and I represents that electric current is joined
Number, B represents magnetic induction parameter, and μ is the pcrmeability of medium；
Step S23, described current parameters and a current threshold are compared by comparison module, when current parameters exceedes described electric current
During threshold value, after time delay module carries out time delay, it is judged that whether the comparative result exceeding described current threshold is real power train
System fault causes, the most then notify described calling module；
Step S24, described calling module sends described fault or abnormal state letter according to described notice to a switch board
Number；
Step S25, described switch board sends warning or trip signal according to described fault or abnormal state signal.
Preferably, in step S25, described switch board sends warning or tripping operation according to described fault or abnormal state signal
The step of signal includes, when described switch board receives fault-signal, described switch board sends alarm signal, and to power train
The chopper of system sends trip signal；When described switch board receives abnormal state signal, described switch board sends warning
Signal.
In sum, the present invention is by laying respectively at the three of the underface of each three-phase conductor on the wire of power system
Individual measurement module, the distance between distance and two adjacent measurement modules between two adjacent three-phase conductors is equal, Mei Gesan
Distance between phase conductor and the measurement module immediately below it is equal, and it is relative that each measurement module is used for measuring all three-phase conductors
Magnetic field intensity in it synthesizes analog parameter or magnetic induction synthesis analog parameter；Signal conversion module, for by each magnetic
Field intensity synthesis analog parameter or magnetic induction synthesis analog parameter are converted to magnetic field intensity digital parameters or magnetic induction
Digital parameters；Time delay module, is used for carrying out time delay；Comparison module, for by every phase magnetic field intensity digital parameters (corresponding each phase
Electric current) respectively with a magnetic field intensity threshold ratio relatively, or by every phase magnetic induction digital parameters (corresponding each phase current) and
Magnetic induction threshold ratio relatively, when magnetic field intensity digital parameters or magnetic induction digital parameters exceed described magnetic field intensity threshold value
Or during magnetic induction threshold value, after described time delay module carries out time delay, it is judged that exceed described magnetic field intensity threshold value or magnetic induction
Whether the comparative result of intensity threshold is the fault of real power system or abnormal state causes, the most then notify one
Letter module；Described calling module, for sending described fault or abnormal state signal according to described notice to a switch board；Institute
State switch board, for sending warning or trip signal according to described fault or abnormal state signal, it is possible to solve current electric power
In system relay protection, current cable is oversize and the drawback of easy malfunction, accurately acquires the failure condition of power system, and
Report to the police in time.
Other detailed content of the present embodiment specifically can be found in embodiment one, does not repeats them here.
The present embodiment can solve the problem that current cable in current relay protection of power system is oversize and the drawback of easy malfunction,
Can correct reaction electric power system fault and abnormal state, and correct carrying out react, as tripped or reporting to the police.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment, identical similar portion sees mutually.For system disclosed in embodiment
For, owing to corresponding to the method disclosed in Example, so describe is fairly simple, relevant part sees method part explanation
?.
Professional further appreciates that, in conjunction with the unit of each example that the embodiments described herein describes
And algorithm steps, it is possible to electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate hardware and
The interchangeability of software, the most generally describes composition and the step of each example according to function.These
Function performs with hardware or software mode actually, depends on application-specific and the design constraint of technical scheme.Specialty
Technical staff specifically should can be used for using different methods to realize described function to each, but this realization should not
Think beyond the scope of this invention.
Obviously, those skilled in the art can carry out various change and the modification spirit without deviating from the present invention to invention
And scope.So, if the present invention these amendment and modification belong to the claims in the present invention and equivalent technologies thereof scope it
In, then the present invention is also intended to change and including modification include these.
Claims (10)
1. a protective relaying device, it is characterised in that including:
Lay respectively at three measurement modules of the underface of each three-phase conductor on the wire of power system, two adjacent three-phases
The distance between distance and two adjacent measurement modules between conductor is equal, each three-phase conductor and the measurement mould immediately below it
Distance between block is equal, and each measurement module synthesizes simulation ginseng for measuring all three-phase conductors relative to its magnetic field intensity
Number or magnetic induction synthesis analog parameter；
Signal conversion module, for being converted to each magnetic field intensity synthesis analog parameter or magnetic induction synthesis analog parameter
Magnetic field intensity digital parameters or magnetic induction digital parameters；
Time delay module, is used for carrying out time delay；
Comparison module, is used for by each magnetic field intensity digital parameters respectively with a magnetic field intensity threshold ratio relatively, or by every phase magnetic strength
Answer strength figures parameter with a magnetic induction threshold ratio relatively, when magnetic field intensity digital parameters or magnetic induction digital parameters surpass
When crossing described magnetic field intensity threshold value or magnetic induction threshold value, after described time delay module carries out time delay, it is judged that exceed described magnetic
Whether the comparative result of field intensity threshold value or magnetic induction threshold value is the fault of real power system or abnormal state draws
Rise, the most then notify a calling module；
Described calling module, for sending described fault or abnormal state signal according to described notice to a switch board；
Described switch board, for sending warning or trip signal according to described fault or abnormal state signal.
2. protective relaying device as claimed in claim 1, it is characterised in that when described switch board receives fault-signal,
Described switch board sends alarm signal, and sends trip signal to the chopper of power system；When described switch board receives not
During the signal of normal condition, described switch board sends alarm signal.
3. protective relaying device as claimed in claim 1, it is characterised in that described signal conversion module also will be according to all three
Phase conductor is respectively relative to magnetic field intensity synthesis analog parameter or the magnetic induction synthesis analog parameter life of each measurement module
The magnetic field intensity becoming each three-phase conductor to be respectively relative to each measurement module synthesizes component or the magnetic induction of analog parameter
The component of synthesis analog parameter, and component or the magnetic induction of each magnetic field intensity synthesis analog parameter are synthesized analog parameter
Component be converted to component or the component of magnetic induction digital parameters of magnetic field intensity digital parameters, and strong according to all magnetic fields
The component of degree synthesis analog parameter or the component of all magnetic induction synthesis analog parameter obtain the current parameters of three-phase conductor.
4. protective relaying device as claimed in claim 3, it is characterised in that described signal conversion module is fixed by electromagnetic induction
Rule formula ∫ Hdl=∑ I obtains the current parameters of each three-phase conductor, or by public according to formula B=μ H and the law of electromagnetic induction
Formula ∫ Hdl=∑ I obtains the current parameters of each three-phase conductor, and wherein, H represents magnetic field intensity parameter, and I represents current parameters, B
Representing magnetic induction parameter, μ is the pcrmeability of medium.
5. protective relaying device as claimed in claim 4, it is characterised in that described comparison module, is additionally operable to described electric current
Parameter compares with a current threshold, when current parameters exceedes described current threshold, after described time delay module carries out time delay, sentences
Whether the disconnected comparative result exceeding described current threshold is the fault of real power system or abnormal state causes, if so,
Then notify described calling module.
6. a relay protecting method, uses protective relaying device as claimed in claim 1, it is characterised in that described method
Including:
Each measurement module is measured all three-phase conductors and is synthesized analog parameter or magnetic induction conjunction relative to its magnetic field intensity
Become analog parameter；
Each magnetic field intensity synthesis analog parameter or magnetic induction synthesis analog parameter are converted to magnetic field by signal conversion module
Strength figures parameter or magnetic induction digital parameters；
Comparison module by each magnetic field intensity digital parameters respectively with a magnetic field intensity threshold ratio relatively, or by every phase magnetic induction
Digital parameters and a magnetic induction threshold ratio relatively, when magnetic field intensity digital parameters or magnetic induction digital parameters exceed described
When magnetic field intensity threshold value or magnetic induction threshold value, after time delay module carries out time delay, comparison module judges to exceed described magnetic field
Whether the comparative result of intensity threshold or magnetic induction threshold value is the fault of real power system or abnormal state causes,
The most then notify calling module；
Described calling module sends described fault or abnormal state signal according to described notice to a switch board；
Described switch board sends warning or trip signal according to described fault or abnormal state signal.
7. relay protecting method as claimed in claim 6, it is characterised in that described switch board is according to described fault or abnormal
Status signal sends the step of warning or trip signal and includes, when described switch board receives fault-signal, and described switch board
Send alarm signal, and send trip signal to the chopper of power system；When described switch board receives abnormal state letter
Number time, described switch board sends alarm signal.
8. a relay protecting method, uses protective relaying device as claimed in claim 1, it is characterised in that described method
Including:
Each measurement module is measured all three-phase conductors and is synthesized analog parameter or magnetic induction conjunction relative to its magnetic field intensity
Become analog parameter；
Signal conversion module is respectively relative to the magnetic field intensity synthesis analog parameter of each measurement module according to all three-phase conductors
Or magnetic induction synthesis analog parameter generates each three-phase conductor and is respectively relative to the magnetic field intensity synthesis of each measurement module
The component of analog parameter or the component of magnetic induction synthesis analog parameter, and dividing each magnetic field intensity synthesis analog parameter
The component of amount or magnetic induction synthesis analog parameter is converted to component or the magnetic induction numeral of magnetic field intensity digital parameters
The component of parameter, and according to all magnetic field intensities synthesis component of analog parameter or all magnetic induction synthesis analog parameter
Component obtains the current parameters of three-phase conductor；
Described current parameters and a current threshold are compared by comparison module, when current parameters exceedes described current threshold, are prolonging
Time after module carries out time delay, it is judged that the electric power system fault whether comparative result exceeding described current threshold is real causes,
The most then notify described calling module；
Described calling module sends described fault or abnormal state signal according to described notice to a switch board；
Described switch board sends warning or trip signal according to described fault or abnormal state signal.
9. relay protecting method as claimed in claim 8, it is characterised in that described switch board is according to described fault or abnormal
Status signal sends the step of warning or trip signal and includes, when described switch board receives fault-signal, and described switch board
Send alarm signal, and send trip signal to the chopper of power system；When described switch board receives abnormal state letter
Number time, described switch board sends alarm signal.
10. relay protecting method as claimed in claim 8, it is characterised in that signal conversion module is according to all magnetic field intensities
The component of synthesis analog parameter or the component of all magnetic induction synthesis analog parameter obtain the electric current ginseng of each three-phase conductor
In the step of number, described signal conversion module obtains the electricity of each three-phase conductor by law of electromagnetic induction formula ∫ Hdl=∑ I
Stream parameter, or join by obtaining the electric current of each three-phase conductor according to formula B=μ H and law of electromagnetic induction formula ∫ Hdl=∑ I
Number, wherein, H represents magnetic field intensity parameter, and I represents that current parameters, B represent magnetic induction parameter, and μ is the pcrmeability of medium.
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|---|---|---|---|---|
| CN101027562A (en) * | 2004-06-29 | 2007-08-29 | Ssi动力有限公司 | Electric power monitoring and response system |
| CN101309004A (en) * | 2008-07-07 | 2008-11-19 | 哈尔滨工业大学 | Overcurrent protection circuit |
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| JP2002162423A (en) * | 2000-11-28 | 2002-06-07 | Nishimu Electronics Industries Co Ltd | Device for current detection of power transmission/ distribution line and for analysis of electrical conditions thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101027562A (en) * | 2004-06-29 | 2007-08-29 | Ssi动力有限公司 | Electric power monitoring and response system |
| CN101309004A (en) * | 2008-07-07 | 2008-11-19 | 哈尔滨工业大学 | Overcurrent protection circuit |
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