CN109839567A - A kind of intelligence off-line type single-phase earth fault locating system and method - Google Patents
A kind of intelligence off-line type single-phase earth fault locating system and method Download PDFInfo
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- CN109839567A CN109839567A CN201711219679.3A CN201711219679A CN109839567A CN 109839567 A CN109839567 A CN 109839567A CN 201711219679 A CN201711219679 A CN 201711219679A CN 109839567 A CN109839567 A CN 109839567A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The present invention relates to a kind of intelligent off-line type single-phase earth fault locating systems, including signal source, high pressure clamp meter and terminal device；A kind of intelligence off-line type method for locating single-phase ground fault, comprising the following steps: S detection signal is injected into route on the line by signal source by step 1；Step 2 carries out S detection signal measurement to the signal circuit formed in step 1 by high pressure clamp meter, obtains actual S detected signal value；Step 3, open a terminal equipment, it is communicated with high pressure clamp meter, the high pressure clamp meter will detect twice frequency detecting S signal value with per second, and the S signal value that will be forwarded to terminal device, and will test is temporarily stored in the data buffer area in high pressure clamp meter；Step 4, terminal device carry out Single-phase Ground Connection Failure location determination to the S signal value received；The present invention efficiently solves the failures such as long transmission line high resistance ground, realizes intelligent off-line type singlephase earth fault positioning.
Description
Technical field
The present invention relates to one-phase earthing failure in electric distribution network inspection technical field, specifically a kind of intelligent off-line type is single-phase
Earth design system and method.
Background technique
In China's 6kV, 10kV and 35kV supply and distribution network, singlephase earth fault is that distribution line most routes occurs
Failure, especially 10kV distribution are even more so.And considerable ground fault (especially stealthy ground fault, that is, soft touchdown): such as
Porcelain vase breakdown, inside transformer ground connection, arrester breakdown, mutual inductor ground connection, the insulator breakdown of crane etc., staff is past
Toward needing with several hours, even tens hours could find earth fault.Since long-time cannot restore power transmission,
Not only social influence is very big, but also reduces the electricity sales amount of power department, directly influences the economic benefit of power department.This
Kind situation is more common in the distribution line in rural area, thus greatly reduces the power supply reliability of distribution.And failure inspection
It only leans on megger and manually steps on bar ocular estimate step by step to find earth fault.It is by the repeated multiple times cutting of route with the megger line inspection
Latter section of one section of ground shakes, very troublesome, and again very very time-consuming, and still more megger can only shake several milliamperes of electric currents, and signal is very
It is easy decaying, it is difficult to signal detection, it is helpless to high resistance ground or stealthy ground fault；And it manually steps on step by step
Bar ocular estimate takes a substantial amount of time and a large amount of manpower and material resources again.About distribution line single-phase earthing in currently available technology
The theoretical research of fault point inspection although comprehensively and it is deep it is most of it is theoretical be not on the actual application still, also in reality
It tests the room stage, such as letter transfer function method, port-fault diagnosis, traveling wave method is added to adopt from the point of view of just having applied equipment at present
With it is more be S injection method, but due to the defect of measuring technique (open C T measurement), often will appear measurement interference free performance it is poor,
The problems such as with low precision；There is no a breakdown judge strategy, many equipment using when there are inconvenient, to patrol officer's patrol experience
It is required that the features such as high.
Based on this, for limitation present in above-mentioned status, the invention proposes one kind can avoid due to route point
Cloth capacitor influences and can effectively solve that the intelligent off-line type of the failures such as long transmission line high resistance ground is single-phase to connect to injection S signal
Earth fault positioning system and method.
Summary of the invention
In order to solve above-mentioned the technical problems existing in the prior art, the invention proposes one kind can avoid due to route
Distribution capacity is to the influence for injecting S signal and can effectively solve that the intelligent off-line type of the failures such as long transmission line high resistance ground is single-phase
Earth design system and method.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of intelligence off-line type single-phase earth fault locating system, comprising:
Signal source detects signal injection device for S, and the S detection signal of signal source injection passes through grounding point, the earth, ground connection
Line and signal source constitute signal circuit, and the S of signal source injection detects distribution capacity, the earth, ground connection of the signal by three-phase line
Line and signal source constitute signal circuit, for receiving and providing the signal of ground fault；
High pressure clamp meter is silent CT signal measurement device, for the signal measured and storage assembly source receives；With
And
Terminal device is communicated with high pressure clamp meter, for receiving and analyzing the data of high pressure clamp meter acquisition, is carried out
Indicating fault guiding, comprising:
Data reception module receives the data of high pressure clamp meter acquisition；
Processor constructs the mould of the algorithm suitable for processor memory storage by the data that data reception module receives
Type；And
User interface indicates the execution of determination strategy with processor communication by the model in processor.
A further improvement of the present invention is that the algorithm in the processor is dichotomy.
A further improvement of the present invention is that being provided with master control borad in the high pressure clamp meter, it is arranged on the master control borad
There are circuit conditioning, filtering, AD conversion and Fourier Transform Algorithm, by collected S detected signal value by obtaining reality after calculating
The S detected signal value on border.
A further improvement of the present invention is that the high pressure clamp meter is internally provided with sensor, measured wire is born
The analog quantity of charged current is sampled with frequency twice per second.
A further improvement of the present invention is that the terminal device and high pressure clamp meter carry out channel radio by WiFi module
Letter.
A further improvement of the present invention is that the user interface displays in real time testing result.
A kind of intelligence off-line type method for locating single-phase ground fault, the described method comprises the following steps:
Step 1, by signal source on the line by S detection signal be injected into route, make S detection signal by grounding point,
Greatly, ground line constitutes signal circuit with signal source and passes through the distribution capacity of three-phase line, the earth, ground line and signal source structure
At signal circuit；
Step 2 carries out S detection signal measurement to the signal circuit formed in step 1 by high pressure clamp meter, obtains reality
S detected signal value；
Step 3, open a terminal equipment, is communicated with high pressure clamp meter, and the high pressure clamp meter will be examined twice with per second
Measured frequency detects S signal value, and will be forwarded to terminal device, and the S signal value that will test is temporarily stored in high pressure clamp meter
In interior data buffer area；
Step 4, terminal device carry out Single-phase Ground Connection Failure location determination to the S signal value received, specifically:
S1, three-phase line be shorted injection S signal conditioning under, using the high pressure clamp meter successively measure inject S signal
The three-phase S signal value of wherein side in point two sides, if certain side three-phase S signal value is not much different in 2mA, can determine whether this side without
Ground connection, then can then be searched according to the information prompted on the terminal device in the other side, if three-phase S signal value, wherein
The value of two-phase is not much different in 2mA, and another phase value is much larger than the value of this two-phase, then can determine whether side direction ground connection and grounding point
In maximum detection signal phase；
S2, fault point is being determined behind that side of S Injection Signal, the midpoint using dichotomy in fault section is surveyed
Amount judgement, to further determine that fault point in the which side at fault section midpoint, close to signal source or far from signal source,
Fault section range is gradually reduced by dichotomy, until a position of being out of order is accurately positioned.
A further improvement of the present invention is that the step 2 specifically, be provided in the high pressure clamp meter sensor and
Master control borad, the sensor inside the high pressure clamp meter samples the analog quantity of the load current of measured wire, and passes through master control
On-board circuitry conditioning, filtering, AD conversion and Fourier Transform Algorithm obtain actual S detected signal value after calculating.
A further improvement of the present invention is that S2 in the step 4 specifically: by pressing user interface on terminal device
On the Next button, side phase data area will be selected, and data buffer area data will be forwarded in the phase data area of side at this time,
After data stabilization to be measured, the Next button is pressed, the data in side phase data area will be saved, while middle phase data area will be by
Activation, and so on measure three-phase data after, click the Next button, terminal device will provide sentencing for grounding point direction
Break as a result, clicking the Next button, user interface will be initialised to the interface state continued to test last time detection simultaneously
As a result it will save, continue to select fault section midpoint foundation using dichotomy according to the result of terminal device judgement at this time
First time operating method further judged, and so on until reducing fault section and determining grounding point position.
Further improvement of the invention is, the judging result be no ground, grounding point close to signal source or
Grounding point is far from one of signal source.
Compared with prior art, the beneficial effects of the present invention are: the present invention solves conventionally employed megger pushes and pulls expense step by step
When laborious routine inspection mode and use the inc open C T of equipment application magnetic circuit of S injection method at present, and the measurement essence generated
Spend poor, interference free performance difference problem, avoid due to not intelligence fault location strategy and cause patrol officer that can only pass through
Live a large amount of measurement data combination experience just can be carried out the problem of judging localization of fault, be shorted injection side using a kind of three-phase
The S of formula injects positioning strategy, and since three-phase line distribution capacity is in a basic balance, this mode has been avoided due to line distribution capacitance pair
The influence of S signal is injected, the failures such as effective solution long transmission line high resistance ground realize intelligent off-line type singlephase earth fault
Positioning.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the working principle of the invention figure；
Fig. 2 is the external structure schematic diagram of signal source 6 in the present invention；
Fig. 3 is the schematic diagram of internal structure of signal source 6 in the present invention；
Fig. 4 is the first wiring schematic diagram of signal source 6 in the present invention；
Fig. 5 is the second wiring schematic diagram of signal source 6 in the present invention；
Fig. 6 is the third wiring schematic diagram of signal source 6 in the present invention；
Fig. 7 is the key wiring diagram of mesohigh clamp meter 21 and terminal device of the present invention；
Fig. 8 is the structural schematic diagram of mesohigh clamp meter 21 of the present invention；
Fig. 9 is the structural schematic diagram of five section link rods 25 in the present invention；
It is 21 first application method schematic diagram of high pressure clamp meter that Figure 10, which is in the present invention,；
It is 21 second application method schematic diagram of high pressure clamp meter that Figure 11, which is in the present invention,；
It is 21 third application method schematic diagram of high pressure clamp meter that Figure 12, which is in the present invention,；
Figure 13 is the no ground guiding surface chart of user interface in the present invention；
Figure 14 is the grounding point of user interface in the present invention far from interface derivation graph at signal source；
Figure 15 is the grounding point of user interface in the present invention close to interface derivation graph at signal source.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Fig. 1 to Figure 15, a kind of intelligence off-line type single-phase earth fault locating system, comprising:
Signal source 6 detects signal injection device for S, and the S detection signal that signal source 6 is injected passes through grounding point 9, the earth, connects
Ground wire 5 and signal source 6 constitute signal circuit, the S detection signal that signal source 6 is injected by the distribution capacity of three-phase line, the earth,
Ground line 5 constitutes signal circuit with signal source 6, for receiving and providing the signal of ground fault；
High pressure clamp meter 21 is silent CT signal measurement device, for the letter measured and storage assembly source 6 receives
Number；And
Terminal device 8 is communicated with high pressure clamp meter 21, for receiving and analyzing the number of the acquisition of high pressure clamp meter 21
According to progress indicating fault guiding, comprising:
Data reception module receives the data of high pressure clamp meter acquisition；
Processor constructs the mould of the algorithm suitable for processor memory storage by the data that data reception module receives
Type；And
User interface indicates the execution of determination strategy with processor communication by the model in processor.
When it is implemented, the algorithm in the processor is dichotomy.
When it is implemented, being provided with master control borad 34 in the high pressure clamp meter, circuit tune is provided on the master control borad 34
Reason, filtering, AD conversion and Fourier Transform Algorithm detect collected S detected signal value by obtaining actual S after calculating
Signal value.
When it is implemented, the high pressure clamp meter 21 is internally provided with sensor 33, to the load current of measured wire
Analog quantity is sampled with frequency twice per second.
When it is implemented, the terminal device 8 is carried out wireless communication with high pressure clamp meter 21 by WiFi module.
When it is implemented, the user interface displays in real time testing result.
A kind of intelligence off-line type method for locating single-phase ground fault, the described method comprises the following steps:
S detection signal is injected into route on the line by signal source 6 by step 1, and S detection signal is made to pass through grounding point
9, the earth, ground line 5 and signal source 6 constitute signal circuit and pass through the distribution capacity of three-phase line, the earth, ground line 5 and letter
Number source 6 constitutes signal circuit；
Step 2 carries out S detection signal measurement to the signal circuit formed in step 1 by high pressure clamp meter 21, obtains reality
The S detected signal value on border；
Step 3, the equipment that opens a terminal 8, are communicated with high pressure clamp meter 21, and the high pressure clamp meter 21 will be with per second two
Secondary detection frequency detecting S signal value, and will be forwarded to terminal device 8, and the S signal value that will test is temporarily stored in high voltage tong
In data buffer area 33 in flow table 21；
Step 4, terminal device carry out Single-phase Ground Connection Failure location determination to the S signal value received, specifically:
S1, three-phase line be shorted injection S signal conditioning under, using the high pressure clamp meter 21 successively measure injection S believe
Wherein the three-phase S signal value of side can determine whether this side if certain side three-phase S signal value is not much different in 2mA in number point two sides
It is no ground, then it can then be searched according to the information prompted on the terminal device in the other side, if three-phase S signal value,
The value of middle two-phase is not much different in 2mA, and another phase value is much larger than the value of this two-phase, then can determine whether side direction ground connection and be grounded
Point is in maximum detection signal phase；
S2, fault point is being determined behind that side of S Injection Signal, the midpoint using dichotomy in fault section is surveyed
Amount judgement, to further determine that fault point in the which side at fault section midpoint, close to signal source or far from signal source,
Fault section range is gradually reduced by dichotomy, until a position of being out of order is accurately positioned.
When it is implemented, the step 2 is specifically, be provided with sensor 33 and master control borad in the high pressure clamp meter 21
34, the sensor 33 inside the high pressure clamp meter 21 samples the analog quantity of the load current of measured wire, and passes through master control
Circuit conditioning, filtering, AD conversion and Fourier Transform Algorithm obtain actual S detected signal value after calculating on plate 34.
When it is implemented, S2 in the step 4 specifically: " next in user interface on terminal device 8 by pressing
Step " button, side phase data area will be selected, and data buffer area data will be forwarded in the phase data area of side at this time, number to be measured
After stabilization, the Next button is pressed, the data in side phase data area will be saved, while middle phase data area will be activated, according to
It is secondary analogize measured three-phase data after, click the Next button, terminal device 8 will provide the judgement knot in grounding point direction
Fruit, clicks the Next button, and user interface will be initialised to the result of the interface state continued to test last time detection simultaneously
It will save, the result judged at this time according to terminal device 8 continues to select fault section midpoint according to the using dichotomy
Once-through operation method further judged, and so on until reducing fault section and determining grounding point position.
When it is implemented, the judging result is that no ground, grounding point is being believed close to signal source or grounding point separate
One of number source.
In the use of the present invention, specifically:
Present system is by signal source 6, high pressure clamp meter 21, clamp meter link rod 7, terminal device 8, S Injection Signal line
4,5, two three-phase shorting stubs 1 of geodesic, S signal injection mounting link rod 2 form.Its working principle and application method are as follows:
Equipment electrical connection must be being carried out by Fig. 1 first using preceding, concrete operations are as follows: by being grounded nut in the signal source 6
16 are connected 5 one end 17 with the ox muzzle of the ground line with the grounding screw of the signal source 6,5 other ends of the ground line
Earth clip clamps directly to (be not drawn into Fig. 1) in ground connection pricker or line bar bracing wire, and the S injection line 4 passes through with ox muzzle one end 14
Butterfly-type bolt 15 on the S signal injection mounting link rod 2 is connected on its stud 13, and by two shorting stubs 1 by three
The S signal injection mounting link rod 2 is shorted at the stud 13, and the S injection 4 heading power plug one end 18 of line is inserted
Enter on the signal accessory power outlet 10 on 6 rear panel of signal source and locks clockwise；After wiring, three S signals are infused
Enter to mount link rod 2 to be articulated on three-phase line respectively；It turns on the power switch, passes through operation button, at this time 6 meeting of signal source
There is the S feature of certain power to detect signal for injection on toward route, and detection signal can pass through the grounding point 9, the earth, ground line
5 with the signal source 6 constitute signal circuit and pass through the distribution capacity of three-phase line, the earth, ground line 5 with the signal source 6
Constitute signal circuit.
Following 7 assembling process of clamp meter link rod is, by the insulating bar connector 24 of high pressure clamp meter 21 by crane
Stick 25 is connected with high pressure clamp meter 21, and the link rod 25 is made of five sections, one meter of tapped single-unit link rod,
The high voltage tong stream can be passed through when carrying out S signal measurement according to the joint number of practical measured wire height selection installation link rod
The work of 21 face on board supply button of table, 23 starter, power supply indicator 22 is lighted at this time, and the indicator light 22 is mainly used to refer to
After showing that the working condition of the high pressure clamp meter 21, the high pressure clamp meter 21 power on, in order to realize low-power consumption requirement, 15min
After will automatic shutdown.Working condition activation can be carried out by the power knob 23 at this time, by described after electric power starting
Tested load conducting wire is directed in binding clip, concrete operations by the binding clip containing leader that the top of high pressure clamp meter 21 is equipped with
It is as follows: as shown in Figure 10 to Figure 12, measured wire is allowed to be in the middle part of binding clip boot section, instrument boot section perpendicular to conducting wire,
Instrument binding clip is pushed forward toward measured wire, measured wire slides into inside binding clip at this time, at this time inside the high pressure clamp meter 21
The meeting of sensor 33 samples the analog quantity of the load current of measured wire, and passes through circuit conditioning, filtering, AD turns on master control borad 34
It changes and (is sampled with second twice frequency), Fourier Transform Algorithm obtains actual S detected signal value after calculating.
Next open a terminal equipment, user interface display, at this time the first WiFi of the high pressure clamp meter 21
Module 19 can establish communication link with the second WiFi module 20 of the terminal device 8 automatically, if link is successfully established, the end
End equipment 8 can with " dichloro-diphenyl-dichlorothane " sound reminded.The high pressure clamp meter 21 will be with the frequency inspection of detection twice per second at the same time
S signal value is surveyed, and forwards it to the terminal device 8, and the S signal value that will test is temporarily stored in data buffer area 33
In.
When carrying out Single-phase Ground Connection Failure positioning, the terminal device judges that the strategy of grounding point is as follows: in triple line
It is short out to connect under injection S signal conditioning, successively measure using the high pressure clamp meter 21 and injects in S signaling point two sides wherein side
Three-phase S signal value can determine whether that this side is no ground (such as Figure 13), then connect if certain side three-phase S signal value is not much different in 2mA
Can be searched according to the information prompted on the terminal device 8 in the other side；If three-phase S signal value, the wherein value of two-phase
It is not much different in 2mA, and another phase value is much larger than the value of this two-phase, then can determine whether side direction ground connection and grounding point is examined in maximum
It surveys in signal phase (such as Figure 14).Fault point is being determined behind that side of S Injection Signal, we use dichotomy in fault section again
Midpoint measure judgement, come further determine that fault point fault section midpoint that side (also close to signal source
Far from signal source), and so on we fault section range can be gradually reduced by dichotomy；It is until being accurately positioned
It is out of order a position.Specific fault point inspection operation is as follows: opening power switch 11 on 6 panel of signal source, passes through key
12 operations make it inject S signal on three-phase line with three-phase shorting stub 1 by the signal wire 4, and S signal can pass through institute at this time
State grounding point 9, the earth, ground line 5 with the signal source 6 constitute signal circuit and by the distribution capacity of three-phase line, the earth,
Ground line 5 constitutes signal circuit with the signal source 6.At this moment decanting point side one is measured by the high pressure clamp meter 21
Side phase (A phase or C phase), the high pressure clamp meter 21 can will measure S signal value and is transmitted to by the first WiFi module 19 at this time
The terminal device, and the S signal value that will test is temporarily stored in data buffer area 33.Then by pressing " next step "
Button, side phase data area will be selected, and data buffer area data will be forwarded in the phase data area of side at this time, and data to be measured are steady
After fixed, the Next button is pressed, the data in side phase data area will be saved, while middle phase data area will be activated, successively class
After the complete three-phase data of supposition amount, the Next button, the terminal device 8, it will provide the judgement knot in grounding point direction are clicked
Fruit, such as: no ground, grounding point is in close signal source, grounding point far from signal source.Click " next step " is then continued to press
Button, the result that interface will be initialised to the interface state continued to test last time detection simultaneously will save, at this time according to institute
State terminal device 8 judgement result using dichotomy continue select fault section midpoint according to first time operating method carry out into
One step judgement, and so on until reduce fault section and determine grounding point position.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. a kind of intelligence off-line type single-phase earth fault locating system characterized by comprising
Signal source, for S detect signal injection device, signal source injection S detection signal by grounding point, the earth, ground line with
Signal source constitute signal circuit, signal source injection S detection signal by the distribution capacity of three-phase line, the earth, ground line with
Signal source constitutes signal circuit, for receiving and providing the signal of ground fault；
High pressure clamp meter is silent CT signal measurement device, for the signal measured and storage assembly source receives；And
Terminal device is communicated with high pressure clamp meter, for receiving and analyzing the data of high pressure clamp meter acquisition, carries out failure
Instruction guiding, comprising:
Data reception module receives the data of high pressure clamp meter acquisition；
Processor constructs the model of the algorithm suitable for processor memory storage by the data that data reception module receives；With
And
User interface indicates the execution of determination strategy with processor communication by the model in processor.
2. a kind of intelligent off-line type single-phase earth fault locating system according to claim 1, it is characterised in that: the place
Managing the algorithm in device is dichotomy.
3. a kind of intelligent off-line type single-phase earth fault locating system according to claim 1, it is characterised in that: the height
It is provided with master control borad in pressing tongs flow table, circuit conditioning, filtering, AD conversion and Fourier transformation are provided on the master control borad and is calculated
Method, by collected S detected signal value by obtaining actual S detected signal value after calculating.
4. a kind of intelligent off-line type single-phase earth fault locating system according to claim 1, it is characterised in that: the height
Pressing tongs flow table is internally provided with sensor, is adopted to the analog quantity of the load current of measured wire with frequency twice per second
Sample.
5. a kind of intelligent off-line type single-phase earth fault locating system according to claim 1, it is characterised in that: the end
End equipment is carried out wireless communication with high pressure clamp meter by WiFi module.
6. a kind of intelligent off-line type single-phase earth fault locating system according to claim 1, it is characterised in that: the use
Family interface displays in real time testing result.
7. a kind of intelligence off-line type method for locating single-phase ground fault, which is characterized in that the described method comprises the following steps:
Step 1, by signal source on the line by S detection signal be injected into route, make S detection signal by grounding point, the earth,
Ground line constitutes signal circuit and be made up of the distribution capacity of three-phase line, the earth, ground line and signal source with signal source to be believed
Number circuit；
Step 2 carries out S detection signal measurement to the signal circuit formed in step 1 by high pressure clamp meter, obtains actual S
Detected signal value；
Step 3, open a terminal equipment, is communicated with high pressure clamp meter, and the high pressure clamp meter will be with detection frequency twice per second
Rate detects S signal value, and will be forwarded to terminal device, and the S signal value that will test is temporarily stored in high pressure clamp meter
In data buffer area；
Step 4, terminal device carry out Single-phase Ground Connection Failure location determination to the S signal value received, specifically:
S1, three-phase line be shorted injection S signal conditioning under, using the high pressure clamp meter successively measure inject S signaling point two
The wherein three-phase S signal value of side in side can determine whether this side without connecing if certain side three-phase S signal value is not much different in 2mA
Ground then can then be searched according to the information prompted on the terminal device in the other side, if three-phase S signal value, wherein two
The value of phase is not much different in 2mA, and another phase value is much larger than the value of this two-phase, then can determine whether side direction ground connection and grounding point exists
In maximum detection signal phase；
S2, determining that fault point behind that side of S Injection Signal, measured in the midpoint of fault section using dichotomy and sentenced
It is disconnected, to further determine that fault point passes through in the which side at fault section midpoint close to signal source or far from signal source
Fault section range is gradually reduced in dichotomy, until a position of being out of order is accurately positioned.
8. a kind of intelligent off-line type method for locating single-phase ground fault according to claim 7, it is characterised in that: the step
Rapid 2 specifically, be provided with sensor and master control borad, the sensor inside the high pressure clamp meter is to quilt in the high pressure clamp meter
The analog quantity sampling of the load current of conducting wire is surveyed, and is calculated by the conditioning of master control on-board circuitry, filtering, AD conversion and Fourier transformation
Method obtains actual S detected signal value after calculating.
9. a kind of intelligent off-line type method for locating single-phase ground fault according to claim 7, which is characterized in that the step
S2 in rapid 4 specifically: by pressing the Next button on terminal device in user interface, side phase data area will be selected,
Data buffer area data will be forwarded in the phase data area of side at this time, after data stabilization to be measured, press the Next button, side
The data in phase data area will be saved, while middle phase data area will be activated, and so on measured three-phase data after, click
The Next button, terminal device will provide the judging result in grounding point direction, click the Next button, and user interface will
The result that the interface state continued to test last time detection simultaneously can be initialised to will save, and be judged at this time according to terminal device
Result continue that fault section midpoint is selected further to be judged according to first time operating method using dichotomy, successively class
It pushes away until reducing fault section and determining grounding point position.
10. a kind of intelligent off-line type method for locating single-phase ground fault according to claim 9, which is characterized in that described
Judging result is for no ground, grounding point in close signal source or grounding point far from one of signal source.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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