CN108802557A - A kind of fault locator based on disturbing signal - Google Patents
A kind of fault locator based on disturbing signal Download PDFInfo
- Publication number
- CN108802557A CN108802557A CN201810684713.2A CN201810684713A CN108802557A CN 108802557 A CN108802557 A CN 108802557A CN 201810684713 A CN201810684713 A CN 201810684713A CN 108802557 A CN108802557 A CN 108802557A
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- signal
- fault
- current transformer
- disturbing
- microcontroller
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of fault locators based on disturbing signal,Including Injection Signal generator and signal tracing detector,The Injection Signal generator includes a component,Controller and peripheral circuit,One time component includes disconnecting switch,Fuse,Contactor,Transformer,Thyristor,First current transformer and the second current transformer,First current transformer has been sequentially connected in series disconnecting switch,Fuse,Contactor,Transformer,Second current transformer and thyristor,Signal tracing detector includes modulate circuit,Microcontroller,Communication module and communication terminal,The present invention alerts indicating fault,POWER SYSTEM DISTURBANCE SIGNALS is injected,Disturbing signal quick sensing,The technologies such as mobile data communication are combined,Realize that singlephase earth fault is online quick and precisely to be positioned,Improve the position success rate and location efficiency of singlephase earth fault,Shorten fault location time,And operand is small,It is more convenient.
Description
Technical field
The present invention relates to fault location technology field more particularly to a kind of fault locators based on disturbing signal.
Background technology
Distribution singlephase earth fault location technology is the further power supply reliability for promoting power distribution network, promotes circuit O&M effect
The key technology of rate and quality, and the fault detect under small current neutral grounding environment generally comprises two levels：First is failure choosing
Line determines that single-phase earthing has occurred in which feeder line on electric substation's 10kV busbares；Second is localization of fault, that is, is determined single
The specific location that mutually ground connection occurs.For domestic and international present Research, failure line selection solves substantially, method have zero sequence drying method,
Power direction method, negative-sequence current method etc.；Localization of fault is at the early-stage, mainly offline positioning mode, because ground signalling is faint,
It is easy to be disturbed, tuning on-line technology not yet obtains substantive breakthroughs, but offline mode handles failure in real time and distribution is automatic
It is not reached requirement for change.
Small current neutral grounding system is divided to two kinds of isolated neutral and neutral by arc extinction coil grounding, the first：Neutral point
Isolated neutral system fault signature when circuit f points have single-phase earthing, is equivalent to f points and generates a zero sequence under this system environments
Voltage source.Residual voltage source generates zero sequence capacity current [4] on the line by line mutual-ground capacitor (i.e. zero-sequence network impedance).
Obviously, according to the phase relation between voltage, electric current, the branch of only zero-sequence current lag residual voltage 900 is likely to be event
Hinder the part in path, it is on the contrary then be not.Therefore, the electrical quantity that circuit fixes measuring point can be relied on to acquire substantially to confine event accordingly
Hinder range.Certainly, due to circuit unsymmetrical factors, even if unfaulty conditions may also have residual voltage in electric substation's 10kV busbares
Place forms (numerical value is smaller), therefore need to set a residual voltage threshold value, and only when residual voltage is more than, ability startup separator is fixed
Position.
Second：Arc suppression coil earthing system fault signature, under this system environments, due to the interference of arc suppression coil,
It will appear following phenomenon：Faulty line zero-sequence current phase may be identical as sound circuit, but zero-sequence current amplitude be less than it is strong
Full line.In order to obtain fault signature, it is contemplated that control arc suppression coil, make its alternate run in overcompensation and undercompensation
Between.In this way, the zero-sequence current phasor of failure path it is inevitable in -90 degree to alternately changing between 90 degree, and regular link holding
90 degree do not change.
Existing location technology, to ensure that power supply is reliably and stable, 10kV networks are generally closed loop design, open loop fortune
A series of measuring points, these measuring points point need to be arranged to obtain the real time fail information after single-phase earthing occurs for circuit in row on the line
Two classes：1. measuring point at substation bus bar.It is residual voltage phasor when obtaining failure that it, which is acted on, and measuring point is 2. disperseed on circuit, is made
With being zero-sequence current phasor when obtaining failure, using measuring point adjacent each other as boundary, you can carry out section partition to circuit, then auxiliary
With certain algorithm, it is possible to earth fault is limited in specific section, the target of fault location has also just been reached.
The operand of such method is larger, and current in the fault point is smaller, it is difficult to realize and be accurately positioned.
Invention content
It is computationally intensive based on existing localization method present in background technology, current in the fault point is small is not easy to be accurately positioned, this
Invention proposes a kind of fault locator based on disturbing signal.
To achieve the goals above, present invention employs following technical solutions：
A kind of fault locator based on disturbing signal, including Injection Signal generator and signal tracing detector, the note
It includes a component, controller and peripheral circuit to enter signal generator, and a component includes disconnecting switch, fuse, connects
Tentaculum, transformer, thyristor, the first current transformer and the second current transformer, first current transformer are sequentially connected in series
There are disconnecting switch, fuse, contactor, transformer, the second current transformer and the thyristor, the signal tracing detector to include
Modulate circuit, microcontroller, communication module and communication terminal, modulate circuit include filter, signal amplifier, analog-digital converter.
Preferably, the model STMFZGT of the controller, the model STCC of microcontroller, the model of analog-digital converter
For ADC.
Preferably, the filter obtains desired frequency for filtering out the frequency except specific frequency in sampled signal
Rate, and the output end of filter is electrically connected with the input terminal of signal amplifier.
Preferably, the signal amplifier makes signal meet for will be amplified by the signal after filter filtering
The requirement of signal is can receive, and the input terminal of the output end of signal amplifier and analog-digital converter is electrically connected.
Preferably, the analog-digital converter can be received for will become microcontroller through the amplified signal of signal amplifier
Digital signal, and the output end of analog-digital converter is electrically connected with the input terminal of microcontroller.
Preferably, the output end of the microcontroller is electrically connected with communication module, and communication module is connected with communication terminal.
The beneficial effects of the invention are as follows：
Under two class small current neutral grounding environment occur single-phase earthing when fault signature on the basis of, by indicating fault alarm, electric power
The technologies such as disturbing signal injection, disturbing signal quick sensing, mobile data communication are combined, and have studied POWER SYSTEM DISTURBANCE SIGNALS note
Enter the realization method perceived with POWER SYSTEM DISTURBANCE SIGNALS, realize that singlephase earth fault is online quick and precisely to be positioned, improves list
The position success rate and location efficiency of phase earth fault, shorten fault location time, and operand is small, more convenient.
Description of the drawings
Fig. 1 is a kind of functional block diagram of the fault locator based on disturbing signal proposed by the present invention；
Fig. 2 is an a kind of component of the Injection Signal generator of the fault locator based on disturbing signal proposed by the present invention
Figure；
Fig. 3 is a kind of block diagram of the signal tracing detection of fault locator based on disturbing signal proposed by the present invention；
Fig. 4 is a kind of disturbing signal datagram of the fault locator based on disturbing signal proposed by the present invention.
In figure：1 Injection Signal generator, 2 signal tracing detectors, 3 controllers, 4 disconnecting switch, 5 fuses, 6 contacts
Device, 7 transformers, 8 thyristors, 9 first current transformers, 10 second current transformers, 11 filters, 12 signal amplifiers, 13
Analog-digital converter, 14 microcontrollers, 15 communication modules, 16 communication terminals.
Specific implementation mode
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 describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Referring to Fig.1-4, a kind of fault locator based on disturbing signal, including Injection Signal generator 1 and signal are sought
Mark detector 2, Injection Signal generator 1 include a component, controller 3 and peripheral circuit, the model of controller 3
STM32F407ZGT6, a component include disconnecting switch 4, fuse 5, contactor 6, transformer 7, thyristor 8, the first electric current
Mutual inductor 9 and the second current transformer 10, the first current transformer 9 be sequentially connected in series disconnecting switch 4, fuse 5, contactor 6,
Transformer 7, the second current transformer 10 and thyristor 8, signal tracing detector 2 include modulate circuit, microcontroller 14, communication mould
Block 15 and communication terminal 16, the model STC89C51 of microcontroller 14, modulate circuit include filter 11, signal amplifier 12,
Analog-digital converter 13, the model ADC0832 of analog-digital converter 13, filter 11 is used for will be except specific frequency in sampled signal
Frequency filter out, obtain desired frequency, and the output end of filter 11 is electrically connected with the input terminal of signal amplifier 12, believe
Number amplifier 12 makes signal meet the requirement that can receive signal for will be amplified by 11 filtered signal of filter,
And the output end of signal amplifier 12 and the input terminal of analog-digital converter 13 are electrically connected, analog-digital converter 13 is used for will be through signal
The amplified signal of amplifier 12 becomes the digital signal that microcontroller 14 can receive, and the output end of analog-digital converter 13 is electrical
It is connected with the input terminal of microcontroller 14, the output end of microcontroller 14 is electrically connected with communication module 15, and communication module 15 is connected with
Communication terminal 16
Operation principle：With reference to figure 1-2, when small current neutral grounding system normal operation, line voltage, each phase-to-ground voltage are all symmetrical
, neutral point voltage-to-ground is zero, and residual voltage is zero in power grid, and when single-phase fault occurs, system neutral current potential increases,
There is residual voltage, have zero-sequence current in circuit, connects contactor, the brilliant lock of triggering of non-faulting phase by signal generator 1 this moment
Pipe realizes signal injection, this signal be one it is controllable in short-term（Less than 1/2 cycle）Between signal, signal ground is grounded, is passed through
Mutually phase fault disturbing signal, the fault detector along circuit detect this and disturb in short-term with failure phase structure one for this
Dynamic signal, distance line head end is farthest, the fault detector position rear that is able to detect that disturbing signal, as failure
Point.
In the present embodiment, by extracting Circuit Fault on Secondary Transformer three-phase voltage phasor, residual voltage amplitude is then extracted（UO）,
Minimum voltage in three-phase（Umin）It is poor with minimum phase angle（△θmin）If obtained amplitude is more than 2.5 times of secondary side phase voltage volume
Definite value（Uph）Then show, there are earth fault, to make fault cues, if amplitude is less than 2.5Uph, then by amplitude and 0.05UphThan
Compared with if amplitude is not more than 0.5Uph, then first step extraction voltage phasor is returned to, if being judged as being more than 0.05Uph, then compare Umin
Whether 0.95U is less thanphIf otherwise returning to the first step, if comparing △ θminWhether 100 degree are less than, if otherwise returning to first
Step compares whether Umin is less than 0.2U if then providing fault cuesph,If then providing fault cues, △ θ are judgedminWhether
Less than 75 degree, if then providing fault cues.
System detects busbar voltage, open delta voltage always, when there is singlephase earth fault, provides earth fault and carries
Show, further determine that failure phase with electric power signal injection method later, and triggers non-faulting phase thyristor 8（Including A phases thyristor, B
Phase thyristor and C phase thyristors）Start route selection, detection and localization, when finding there is singlephase earth fault, examination triggering A phase thyristors are examined
Survey whether head end has disturbing signal, if otherwise exporting line selection signal：A phase faults, triggering B phase thyristors start to position, if then
Examination triggering B phase thyristors, whether detection head end has disturbing signal, if exporting line selection signal without if：B phase faults open up triggering C
Phase thyristor is positioned, and line selection signal is exported if having：C phase faults, triggering A phase thyristors open up positioning.
It calculates：It with reference to figure 3, is calculated with 64 sampled points of a cycle, 3.2k sample rates, primary calculate takes 6 cycles
Data, i.e. 384 sample point datas, four period-producers, 2 disturbing signals, 2 disturbing signal 12.5HZ.6 waveforms are divided into 2
A one group, totally three groups, two adjacent groups data mutually subtract, and obtain two waveforms with disturbing signal, mutually subtract the two waveforms,
The data of twice disturbing signal are obtained, to increase the success rate that detection judges, unavoidably has interference in actual samples, generates
Positive and negative value has just obtained the component of disturbing signal so all the points absolute value is summed, by this value and threshold value comparison, greatly
It can determine whether to carry disturbing signal in threshold value, it is all continuously to determine repeatedly since a disturbing signal load time is 2s
When disturbing signal, so that it may to send out the information of fault alarm, event when single-phase earthing occur under two class small current neutral grounding environment
Hinder in feature base, by indicating fault alarm, POWER SYSTEM DISTURBANCE SIGNALS injection, disturbing signal quick sensing, mobile data communication etc.
Technology is combined, and has studied the realization method of POWER SYSTEM DISTURBANCE SIGNALS injection and POWER SYSTEM DISTURBANCE SIGNALS perception, realizes single-phase connect
Earth fault is online quick and precisely to be positioned, and is improved the position success rate and location efficiency of singlephase earth fault, is shortened failure
Positioning time.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art the invention discloses skill within the scope of, according to the technique and scheme of the present invention and its hair
Bright design is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of fault locator based on disturbing signal, including Injection Signal generator (1) and signal tracing detector
(2), which is characterized in that the Injection Signal generator (1) includes a component, controller (3) and peripheral circuit, described primary
Component includes disconnecting switch (4), fuse (5), contactor (6), transformer (7), thyristor (8), the first current transformer (9)
With the second current transformer (10), first current transformer (9) has been sequentially connected in series disconnecting switch (4), fuse (5), has connect
Tentaculum (6), transformer (7), the second current transformer (10) and thyristor (8), the signal tracing detector (2) include conditioning
Circuit, microcontroller (14), communication module (15) and communication terminal (16), modulate circuit include filter (11), signal amplifier
(12), analog-digital converter (13).
2. a kind of fault locator based on disturbing signal according to claim 1, which is characterized in that the controller
(3) model STM32F407ZGT6, the model STC89C51 of microcontroller (14), the model of analog-digital converter (13)
ADC0832。
3. a kind of fault locator based on disturbing signal according to claim 1, which is characterized in that the filter
(11) it is used to filter out the frequency except specific frequency in sampled signal, obtains desired frequency, and the output of filter (11)
End is electrically connected with the input terminal of signal amplifier (12).
4. a kind of fault locator based on disturbing signal according to claim 1, which is characterized in that the signal is put
Big device (12) is used to be amplified by filter (11) filtered signal, and signal is made to meet the requirement that can receive signal,
And the output end of signal amplifier (12) and the input terminal of analog-digital converter (13) are electrically connected.
5. a kind of fault locator based on disturbing signal according to claim 1, which is characterized in that the modulus turns
Parallel operation (13) is used to that the digital signal that microcontroller (14) can receive will to be become through the amplified signal of signal amplifier (12), and
The output end of analog-digital converter (13) is electrically connected with the input terminal of microcontroller (14).
6. a kind of fault locator based on disturbing signal according to claim 1, which is characterized in that the microcontroller
(14) output end is electrically connected with communication module (15), and communication module (15) is connected with communication terminal (16).
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| CN201810684713.2A CN108802557A (en) | 2018-06-28 | 2018-06-28 | A kind of fault locator based on disturbing signal |
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| CN201810684713.2A CN108802557A (en) | 2018-06-28 | 2018-06-28 | A kind of fault locator based on disturbing signal |
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| CN110007198A (en) * | 2019-05-16 | 2019-07-12 | 福州大学 | A kind of novel singlephase earth fault starting method |
| CN113113198A (en) * | 2021-04-08 | 2021-07-13 | 嘉兴学院 | Lightning arrester |
| CN114252752A (en) * | 2021-12-22 | 2022-03-29 | 清华大学 | Fault diagnosis method for power tube in full-control bridge topology circuit |
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| CN113113198A (en) * | 2021-04-08 | 2021-07-13 | 嘉兴学院 | Lightning arrester |
| CN114252752A (en) * | 2021-12-22 | 2022-03-29 | 清华大学 | Fault diagnosis method for power tube in full-control bridge topology circuit |
| CN114252752B (en) * | 2021-12-22 | 2022-12-16 | 清华大学 | Fault diagnosis method for power tube in full-control bridge topology circuit |
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Application publication date: 20181113 |