CN105353273A - Patrolling method of S signal injection positioning patrolling system through three-phase shorting injection mode - Google Patents
Patrolling method of S signal injection positioning patrolling system through three-phase shorting injection mode Download PDFInfo
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- CN105353273A CN105353273A CN201510782422.3A CN201510782422A CN105353273A CN 105353273 A CN105353273 A CN 105353273A CN 201510782422 A CN201510782422 A CN 201510782422A CN 105353273 A CN105353273 A CN 105353273A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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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
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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
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a patrolling method of an S signal injection positioning patrolling system through a three-phase shorting injection mode, and belongs to the technical field of power distribution line fault patrolling. The positioning patrolling system comprises a geodesic line, an S injection signal line, two three-phase shorting lines, three S signal injection hanging link bars, a high voltage clamp flow meter, an S signal generation and detection device, a high voltage clamp flow meter link bar and a smart handheld terminal PDA. The patrolling method comprises the following steps that step 1: equipment connection is performed; step 2: a signal generation and detection loop is formed; step 3: S signal measurement is performed; step 4: the high voltage clamp flow meter and the smart handheld terminal PDA are connected; and step 5: patrolling APP software in the smart handheld terminal PDA is operated, and fault points are judged. The existing problems that the fault positions cannot be rapidly and accurately positioned when faults occur in a 10KV line and the problems of adverse influence of line distribution on S signals and long line high resistance grounding faults can be effectively solved.
Description
Technical field
The present invention relates to a kind of visiting method of locating inspection system, particularly relate to a kind of visiting method of S signal injection location inspection system of three-phase short circuit injection mode, belong to distribution line failure inspection technical field.
Background technology
When 10KV circuit generation singlephase earth fault fault, classic method and technology is adopted roughly to have following a few class:
1, observation: drive along circuit, by visualization line fault point, the original backwardness of this scheme, wastes time and energy, helpless for hidden fault, only can find the earth fault that can visually determine;
2, push or pull step by step: by pulling open a wiretap step by step, whether transformer station still reports earth fault, reduces between access area gradually, until determine faulty spur, the method only can determine faulty spur, can not determine position of failure point;
3, megger method: carry out Insulation test to each branch line by megger, the undesirable branch line that insulate is ground connection branch line, and the method also can only determine faulty spur, can not determine position of failure point.
At present, adopting more is the routine inspection mode of wasting time and energy such as push or pull and megger method step by step, and adopt S injection method to be used for checking that the singlephase earth fault that 10KV circuit occurs is widely applied in the art, but in prior art, during the inc open C T of magnetic circuit due to the equipment application of S injection method that adopts, create the problem such as measuring accuracy difference, interference free performance difference, and there is no the localization of fault strategy of other intelligence and cause patrol officer just can only can be carried out the problem of failure judgement point position in conjunction with experience by on-the-spot a large amount of measurement data.
Summary of the invention
Fundamental purpose of the present invention is to solve the problems referred to above existed in current existing distribution line failure inspection technology, provide a kind of easy to use, simple to operate, exist when effectively can solve 10KV circuit generation singlephase earth fault cannot quick and precisely fault location, line distribution capacitance to the visiting method of S signal injection location inspection system of three-phase short circuit injection mode of the problem such as harmful effect, long transmission line high resistance earthing fault injecting S signal.
Object of the present invention can reach by adopting following technical scheme:
A kind of visiting method of S signal injection location inspection system of three-phase short circuit injection mode, described location inspection system comprises a geodesic line, S Injection Signal line, two three-phase shorting stubs, three S signal injection mounting link rods, a high pressure clamp meter, S signals occur and pick-up unit, a high pressure clamp meter link rod and an intelligent palm terminal PDA, and described visiting method comprises the following steps:
Step 1: carry out equipment connection
S signal is occurred and pick-up unit and S signal injection mount that link rod is connected, S signal occurs and pick-up unit be greatly connected, S signal injection mount link rod connect be connected with hi-line, high pressure clamp meter is connected with high pressure clamp meter link rod, high pressure clamp meter link rod is connected with hi-line;
Step 2: form and occur and detection signal loop
S signal is occurred and pick-up unit and earth point, greatly, ground wire, three-phase shorting stub, S Injection Signal line form and occur and detection signal loop;
Step 3: carry out S signal measurement
By high pressure clamp meter link rod and high voltage tong stream list catenation, carry out S signal measurement by high pressure clamp meter, and obtain S signal detection signal value;
Step 4: connect high pressure clamp meter and intelligent palm terminal PDA
Open the inspection APP software on intelligent palm terminal PDA, and inspection APP software and high pressure clamp meter are carried out wireless connections, the S signal detection signal value that step 3 mesohigh clamp meter detects is sent on intelligent palm terminal PDA, and is kept in intelligent palm terminal PDA;
Step 5: failure judgement point
Inspection APP software in operative intelligence palm terminal PDA, failure judgement point.
Further, described step 1 is further comprising the steps of:
Step 11: by being arranged on S signal and occurring and one end of ground wire occurring with S signal by ground connection nut on pick-up unit and the grounding screw of pick-up unit is connected,
Step 12: the other end of ground wire is directly clipped in ground connection pricker or the bracing wire of line bar;
Step 13: one end of S Injection Signal line is received on the stud of S signal injection mounting link rod by the butterfly-type bolt on S signal injection mounting link rod, and by two three-phase shorting stubs, three S signal injection mounting link rods are carried out short circuit at stud place;
Step 14: one end with the power plug for S Injection Signal line is inserted S signal occur and pick-up unit signal input socket on and locking clockwise;
Step 15: high pressure clamp meter is connected with high pressure clamp meter link rod by the insulating bar connector of high pressure clamp meter tail end;
Three S signal injection mounting link rods and high pressure clamp meter link rod are articulated on hi-line by step 16: after wiring respectively.
Further, described step 2 is further comprising the steps of:
Step 21: open the power switch on the generation of S signal and pick-up unit, adjustment operation button;
Step 22: make the generation of S signal and pick-up unit inject the S feature detection signal with certain power on S Injection Signal line;
Step 23: make detection signal by earth point, greatly, ground wire, three-phase shorting stub, S Injection Signal line and S signal occurs and pick-up unit forms signal circuit.
Further, described step 3 is further comprising the steps of:
Step 31: start the power switch on high pressure clamp meter, the power light above power switch is bright, the signal lamp instruction high pressure clamp meter on high pressure clamp meter is "on" position;
Step 32: tested load hi-line packs tightly in binding clip by the binding clip of high pressure clamp meter;
Step 33: the high pressure clamp meter intelligent processor of high pressure clamp meter inside carries out analog sampling to the load current of tested hi-line with the frequency of twice per second;
Step 34: control the detected signal value that high pressure clamp meter control circuit carries out circuit conditioning, filtering, AD conversion, Fourier Transform Algorithm calculate S signal by high pressure clamp meter master control borad.
Further, in described step 4, inspection APP software carries out wireless connections by the WiFi signal receiver module in intelligent palm terminal PDA and the WiFi signal output module in high pressure clamp meter, and the S signal detection signal value that described high pressure clamp meter detects is kept in the limit phase data memory module in intelligent palm terminal PDA.
Further, described step 5 is further comprising the steps of:
Step 51: under injection S signal conditioning, use described high pressure clamp meter to measure the side three-phase S signal value injecting S signaling point both sides successively, if this side any two-phase of three-phase S signal value is more or less the same in 2mA, can judge that this side is no ground; If wherein two-phase S signal value is more or less the same in 2mA, and another phase value is much larger than the value of this two-phase, then can judge this side to ground connection and earth point go up mutually at maximum detection signal;
Step 52: adopt dichotomy to carry out measurement in the midpoint of fault section and judge, the localization of faults is in the position of fault section mid point, measured by high pressure clamp meter and inject one, S signaling point side limit phase, high pressure clamp meter will measure S signal value and be transmitted to intelligent palm terminal PDA by WiFi signal output module, and leave in the phase data memory module of limit by the S signal value detected;
Step 53: choose limit phase data memory module, stores in the data retransmission in data memory module to limit phase data memory module, and activate limit phase data, intelligent palm terminal PDA provides the judged result in earth point direction;
Step 54: the result detected also is preserved in initialization interface, adopts dichotomy to continue to select fault section midpoint to carry out judging until determine earth point position.
Advantageous Effects of the present invention:
1, the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode of the present invention's design, it adopts traditional S signal injection method in the industry, to be occurred by S signal and pick-up unit injects toward circuit the characteristic frequency signal that has certain power, this signal can pass through earth point, the earth forms signal circuit with device, comparatively heavy current signal is had in the front of earth point, earth point rear current signal is very weak, as long as to be occurred by S signal and pick-up unit detects and occurs current break at some point, this position can be determined.
2, the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode of the present invention's design, exist when solving 10KV circuit generation singlephase earth fault cannot quick and precisely fault location, line distribution capacitance to the problem such as harmful effect, long transmission line high resistance earthing fault injecting S signal; Greatly avoid because line distribution capacitance is on the impact of injecting S signal, the faults such as effective solution long transmission line high resistance ground.
3, the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode of the present invention's design, have easy to use, simple to operate, the advantage such as with low cost, when circuit generation singlephase earth fault, adopt native system effectively can shorten trouble shooting time, and when solving employing traditional scheme, the blindness of grounding fault, practice examining shows to adopt native system to spend 1-2 days time when grounding fault by originally needing, foreshorten to about 40 minutes, the great minimizing line outage time, power consumer is improved greatly to power supply reliability degree of belief.
Accompanying drawing explanation
Fig. 1 is the visiting method process flow diagram of the S signal injection location inspection system of three-phase short circuit injection mode of the present invention;
Fig. 2 is the S signal injection location inspection system operational totality schematic diagram of three-phase short circuit injection mode of the present invention;
Fig. 3 is signal generation apparatus vertical view of the present invention;
Fig. 4 is signal generation apparatus rear view of the present invention;
Fig. 5 is high pressure clamp meter front view of the present invention;
Fig. 6 is high pressure clamp meter left view of the present invention;
Fig. 7 is high pressure clamp meter of the present invention and intelligent palm terminal PDA wireless connections schematic diagram.
In figure: the shorting stub of 1-three-phase, 2-S signal injection mounting link rod, 3-high pressure clamp meter, 31-binding clip, 32-linking arm, 33-power lamp, 34-power switch key, 35-insulating bar linking arm, 36-high pressure clamp meter intelligent processor, 361-high pressure clamp meter control circuit, 362-high pressure clamp meter internal electric source, 363-high pressure clamp meter master control borad, 364-data memory module, 365-WiFi signal output module, 37-insulating bar connector, 38-high pressure clamp meter main body, 4-S Injection Signal line, 5-geodesic line, 6-S signal occurs and pick-up unit, 61-power switch, 62-signal lamp, 63-S signal occurs and pick-up unit body, 64-data display screen, 65-operation push-button, 66-ground connection nut, 67-S signal occurs and pick-up unit cover plate, 68-S signal occurs and pick-up unit padlock, 69-inputs adjusting knob, 610-signal input socket, 611-supply socket, 7-high pressure clamp meter link rod, 8-intelligence palm terminal PDA, 81-intelligence palm terminal PDA control circuit, 82-intelligence palm terminal PDA internal electric source, 83-limit phase data memory module, 84-WiFi signal receiving module, 85-intelligence palm terminal PDA master control borad, 9-hi-line.
Embodiment
For making those skilled in the art clearly and technical scheme clearly of the present invention, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
The visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode that the present embodiment provides is the visiting method of the S signal injection location inspection system based on a kind of three-phase short circuit injection mode as shown in Figure 2, comprise a geodesic line 5, a S Injection Signal line 4, two three-phase shorting stubs 1, three S signal injection mounting link rods 2, one high pressure clamp meter 3, one S signal occurs and pick-up unit 6, one high pressure clamp meter link rod 7 and an intelligent palm terminal PDA8, described S signal generation and pick-up unit 6 are by described geodesic line 5 and the earth connecting to neutral, described S signal generation and pick-up unit 6 mount link rod 2 by described S Injection Signal line 4 with described S signal injection and are connected, three described S signal injection mounting link rods 2 carry out short circuit by two described three-phase shorting stubs 1, three described S signal injection mounting link rods 2 are hung on hi-line 9, described S signal occur and pick-up unit 6 for the generation of S signal and detection, described high pressure clamp meter 3 is hung on described hi-line 9, wireless connections between described high pressure clamp meter 3 and described intelligent palm terminal PDA8, described high pressure clamp meter link rod 7 and described S signal injection mounting link rod 2 form by some single-unit link rods (attached not shown).
As shown in Figure 3 and Figure 4, described S signal occurs and pick-up unit 6 comprises power switch 61, signal lamp 62, S signal occurs and pick-up unit body 63, data display screen 64, operation push-button 65, ground connection nut 66, S signal occurs and pick-up unit cover plate 67, S signal occurs and pick-up unit padlock 68, input adjusting knob 69, signal input socket 610, supply socket 611 and S signal occur and pick-up unit master control borad (attached not shown), described signal lamp 62 comprises power supply signal pilot lamp, charging signals pilot lamp and alien frequencies signal lamp, described operation push-button 65 comprises options button, acknowledgement key and cancel key, described input adjusting knob 69 comprises frequency adjustment knob and electric charge adjusting knob, described S signal generation and pick-up unit padlock 68 are arranged on the outside of the generation of described S signal and pick-up unit body 63.
As shown in Figure 3 and Figure 4, described signal input socket 610 is connected with described S Injection Signal line 4, described supply socket 611 is for being connected with external power supply, described S signal occurs and pick-up unit master control borad is arranged in the generation of described S signal and pick-up unit body 63, described power switch 61, described signal lamp 62, described data display screen 64, described operation push-button 65, described ground connection nut 66, described input adjusting knob 69, described signal input socket 610 and described supply socket 611 are all arranged on the generation of S signal and pick-up unit body 63, described S signal occurs and pick-up unit master control borad and described signal lamp 62, described data display screen 64, described operation push-button 65, described input adjusting knob 69 and described signal input socket 610 connect.
As shown in Figure 5 and Figure 6, described high pressure clamp meter 3 comprises binding clip 31, linking arm 32, power lamp 33, power switch key 34, insulating bar linking arm 35, high pressure clamp meter intelligent processor 36 and insulating bar connector 37, described binding clip 31 is connected with described high pressure clamp meter main body 38 by described linking arm 32, described power lamp 33 and described power switch key 34 are all arranged in described high pressure clamp meter main body 38, and described insulating bar connector 37 is connected with described high pressure clamp meter main body 38 by described insulating bar linking arm 35.
As shown in Figure 5 and Figure 6, described binding clip 31 is for packing tightly described hi-line 9, whether described power lamp 33 is used to indicate described high pressure clamp meter 3 and switches on power, described power switch key 34 is switched on or switched off power supply for controlling described high pressure clamp meter 3, and described high pressure clamp meter intelligent processor 36 exports for the treatment of the data processing of described high pressure clamp meter 3, data storing and signal.
As shown in Figure 5 and Figure 6, described high pressure clamp meter main body 38 is connected with described high pressure clamp meter link rod 7 with described insulating bar connector 37 by described insulating bar linking arm 35, the outside surface of described insulating bar connector 37 is provided with external thread, and described high pressure clamp meter link rod 7 and the inside surface of the contact tip of described insulating bar connector 37 are provided with the internal thread (attached not shown) matched with described external thread.
As shown in Figure 7, described high pressure clamp meter intelligent processor 36 comprises high pressure clamp meter control circuit 361, high pressure clamp meter internal electric source 362, high pressure clamp meter master control borad 363, data memory module 364 and WiFi signal output module 365, described high pressure clamp meter control circuit 361 is laid on described high pressure clamp meter master control borad 363, described high pressure clamp meter internal electric source 362 is for providing power supply for described high pressure clamp meter master control borad 363, described high pressure clamp meter master control borad 363 is connected with described data memory module 364, described WiFi signal output module 365 is arranged on described high pressure clamp meter master control borad 363, described high pressure clamp meter intelligent processor 36 is for carrying out analog sampling to the load current of tested wire with the frequency of twice per second, and control described high pressure clamp meter control circuit 361 by described high pressure clamp meter master control borad 363 and carry out circuit conditioning, filtering, AD conversion, Fourier Transform Algorithm calculates the detected signal value of S signal.
As shown in Figure 7, as a kind of preferred version of the present embodiment, described intelligent palm terminal PDA8 comprises intelligent palm terminal PDA control circuit 81, intelligence palm terminal PDA internal electric source 82, limit phase data memory module 83, WiFi signal receiver module 84 and intelligent palm terminal PDA master control borad 85, described intelligent palm terminal PDA master control borad 85 and described intelligent palm terminal PDA control circuit 81, described intelligent palm terminal PDA internal electric source 82 and described limit phase data memory module 83 connect, described WiFi signal receiver module 84 is arranged on described intelligent palm terminal PDA master control borad 85, described intelligent palm terminal PDA internal electric source 82 is for providing power supply for described intelligent palm terminal PDA8, the data that described limit phase data memory module 83 sends for the described data memory module 364 received in described high pressure clamp meter intelligent processor 36, described WiFi signal receiver module 84 for the wireless connections of described high pressure clamp meter intelligent processor 36, described intelligent palm terminal PDA8 is also provided with inspection APP software.
Concrete, as shown in Figure 1, a kind of visiting method of S signal injection location inspection system of three-phase short circuit injection mode, comprises the following steps:
Step 1: carry out equipment connection
S signal is occurred and pick-up unit and S signal injection mount that link rod is connected, S signal occurs and pick-up unit be greatly connected, S signal injection mount link rod connect be connected with hi-line, high pressure clamp meter is connected with high pressure clamp meter link rod, high pressure clamp meter link rod is connected with hi-line;
Step 2: form and occur and detection signal loop
S signal is occurred and pick-up unit and earth point, greatly, ground wire, three-phase shorting stub, S Injection Signal line form and occur and detection signal loop;
Step 3: carry out S signal measurement
By high pressure clamp meter link rod and high voltage tong stream list catenation, carry out S signal measurement by high pressure clamp meter, and obtain S signal detection signal value;
Step 4: connect high pressure clamp meter and intelligent palm terminal PDA
Open the inspection APP software on intelligent palm terminal PDA, and inspection APP software and high pressure clamp meter are carried out wireless connections, the S signal detection signal value that step 3 mesohigh clamp meter detects is sent on intelligent palm terminal PDA, and is kept in intelligent palm terminal PDA;
Step 5: the inspection APP software in operative intelligence palm terminal PDA, failure judgement point.
As a kind of preferred version of the present embodiment, described step 1 is further comprising the steps of:
Step 11: by being arranged on S signal and occurring and one end of ground wire occurring with S signal by ground connection nut on pick-up unit and the grounding screw of pick-up unit is connected,
Step 12: the other end of ground wire is directly clipped in ground connection pricker or the bracing wire of line bar;
Step 13: one end of S Injection Signal line is received on the stud of S signal injection mounting link rod by the butterfly-type bolt on S signal injection mounting link rod, and by two three-phase shorting stubs, three S signal injection mounting link rods are carried out short circuit at stud place;
Step 14: one end with the power plug for S Injection Signal line is inserted S signal occur and pick-up unit signal input socket on and locking clockwise;
Step 15: high pressure clamp meter is connected with high pressure clamp meter link rod by the insulating bar connector of high pressure clamp meter tail end;
Three S signal injection mounting link rods and high pressure clamp meter link rod are articulated on hi-line by step 16: after wiring respectively.
As a kind of preferred version of the present embodiment, described step 2 is further comprising the steps of:
Step 21: open the power switch on the generation of S signal and pick-up unit, adjustment operation button;
Step 22: make the generation of S signal and pick-up unit inject the S feature detection signal with certain power on S Injection Signal line;
Step 23: make detection signal by earth point, greatly, ground wire, three-phase shorting stub, S Injection Signal line and S signal occurs and pick-up unit forms signal circuit.
As a kind of preferred version of the present embodiment, described step 3 is further comprising the steps of:
Step 31: start the power switch on high pressure clamp meter, the power light above power switch is bright, the signal lamp instruction high pressure clamp meter on high pressure clamp meter is "on" position;
Step 32: tested load hi-line packs tightly in binding clip by the binding clip of high pressure clamp meter;
Step 33: the high pressure clamp meter intelligent processor of high pressure clamp meter inside carries out analog sampling to the load current of tested hi-line with the frequency of twice per second;
Step 34: control the detected signal value that high pressure clamp meter control circuit carries out circuit conditioning, filtering, AD conversion, Fourier Transform Algorithm calculate S signal by high pressure clamp meter master control borad.
As a kind of preferred version of the present embodiment, in described step 4, inspection APP software carries out wireless connections by the WiFi signal receiver module in intelligent palm terminal PDA and the WiFi signal output module in high pressure clamp meter, and the S signal detection signal value that described high pressure clamp meter detects is kept in the limit phase data memory module in intelligent palm terminal PDA.
As a kind of preferred version of the present embodiment, described step 5 is further comprising the steps of:
Step 51: under injection S signal conditioning, use described high pressure clamp meter to measure the side three-phase S signal value injecting S signaling point both sides successively, if this side any two-phase of three-phase S signal value is more or less the same in 2mA, can judge that this side is no ground; If wherein two-phase S signal value is more or less the same in 2mA, and another phase value is much larger than the value of this two-phase, then can judge this side to ground connection and earth point go up mutually at maximum detection signal;
Step 52: adopt dichotomy to carry out measurement in the midpoint of fault section and judge, the localization of faults is in the position of fault section mid point, measured by high pressure clamp meter and inject one, S signaling point side limit phase, high pressure clamp meter will measure S signal value and be transmitted to intelligent palm terminal PDA by WiFi signal output module, and leave in the phase data memory module of limit by the S signal value detected;
Step 53: choose limit phase data memory module, stores in the data retransmission in data memory module to limit phase data memory module, and activate limit phase data, intelligent palm terminal PDA provides the judged result in earth point direction;
Step 54: the result detected also is preserved in initialization interface, adopts dichotomy to continue to select fault section midpoint to carry out judging until determine earth point position.
In sum, the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode of the present embodiment design, it adopts traditional S signal injection method in the industry, to be occurred by S signal and pick-up unit injects toward circuit the characteristic frequency signal that has certain power, this signal can pass through earth point, the earth forms signal circuit with device, comparatively heavy current signal is had in the front of earth point, earth point rear current signal is very weak, as long as to be occurred by S signal and pick-up unit detects and occurs current break at some point, this position can be determined.
The visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode of the present embodiment design, exist when solving 10KV circuit generation singlephase earth fault cannot quick and precisely fault location, line distribution capacitance to the problem such as harmful effect, long transmission line high resistance earthing fault injecting S signal; Greatly avoid because line distribution capacitance is on the impact of injecting S signal, the faults such as effective solution long transmission line high resistance ground.
The visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode of the present embodiment design, have easy to use, simple to operate, the advantage such as with low cost, when circuit generation singlephase earth fault, adopt native system effectively can shorten trouble shooting time, and when solving employing traditional scheme, the blindness of grounding fault, practice examining shows to adopt native system to spend 1-2 days time when grounding fault by originally needing, foreshorten to about 40 minutes, the great minimizing line outage time, power consumer is improved greatly to power supply reliability degree of belief.
The above; be only the preferred embodiment of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in scope disclosed in this invention; be equal to according to technical scheme of the present invention and design thereof and replace or change, all belonged to protection scope of the present invention.
Claims (6)
1. the visiting method of the S signal injection location inspection system of a three-phase short circuit injection mode, described location inspection system comprises a geodesic line, S Injection Signal line, two three-phase shorting stubs, three S signal injection mounting link rods, a high pressure clamp meter, S signals occur and pick-up unit, a high pressure clamp meter link rod and an intelligent palm terminal PDA, it is characterized in that: described visiting method comprises the following steps:
Step 1: carry out equipment connection, S signal is occurred and pick-up unit and S signal injection mount that link rod is connected, S signal occurs and pick-up unit be greatly connected, S signal injection mount link rod connect be connected with hi-line, high pressure clamp meter is connected with high pressure clamp meter link rod, high pressure clamp meter link rod is connected with hi-line;
Step 2: form and occur and detection signal loop, makes S signal occur and pick-up unit and earth point, greatly, ground wire, three-phase shorting stub, S Injection Signal line form and occur and detection signal loop;
Step 3: carry out S signal measurement, by high pressure clamp meter link rod and high voltage tong stream list catenation, carries out S signal measurement by high pressure clamp meter, and obtains S signal detection signal value;
Step 4: connect high pressure clamp meter and intelligent palm terminal PDA, open the inspection APP software on intelligent palm terminal PDA, and inspection APP software and high pressure clamp meter are carried out wireless connections, the S signal detection signal value that step 3 mesohigh clamp meter detects is sent on intelligent palm terminal PDA, and is kept in intelligent palm terminal PDA;
Step 5: failure judgement point, the inspection APP software in operative intelligence palm terminal PDA, failure judgement point.
2. the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode according to claim 1, is characterized in that: described step 1 is further comprising the steps of:
Step 11: by being arranged on S signal and occurring and one end of ground wire occurring with S signal by ground connection nut on pick-up unit and the grounding screw of pick-up unit is connected,
Step 12: the other end of ground wire is directly clipped in ground connection pricker or the bracing wire of line bar;
Step 13: one end of S Injection Signal line is received on the stud of S signal injection mounting link rod by the butterfly-type bolt on S signal injection mounting link rod, and by two three-phase shorting stubs, three S signal injection mounting link rods are carried out short circuit at stud place;
Step 14: one end with the power plug for S Injection Signal line is inserted S signal occur and pick-up unit signal input socket on and locking clockwise;
Step 15: high pressure clamp meter is connected with high pressure clamp meter link rod by the insulating bar connector of high pressure clamp meter tail end;
Three S signal injection mounting link rods and high pressure clamp meter link rod are articulated on hi-line by step 16: after wiring respectively.
3. the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode according to claim 2, is characterized in that: described step 2 is further comprising the steps of:
Step 21: open the power switch on the generation of S signal and pick-up unit, adjustment operation button;
Step 22: make the generation of S signal and pick-up unit inject the S feature detection signal with certain power on S Injection Signal line;
Step 23: make detection signal by earth point, greatly, ground wire, three-phase shorting stub, S Injection Signal line and S signal occurs and pick-up unit forms signal circuit.
4. the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode according to claim 3, is characterized in that: described step 3 is further comprising the steps of:
Step 31: start the power switch on high pressure clamp meter, the power light above power switch is bright, the signal lamp instruction high pressure clamp meter on high pressure clamp meter is "on" position;
Step 32: tested load hi-line packs tightly in binding clip by the binding clip of high pressure clamp meter;
Step 33: the high pressure clamp meter intelligent processor of high pressure clamp meter inside carries out analog sampling to the load current of tested hi-line with the frequency of twice per second;
Step 34: control the detected signal value that high pressure clamp meter control circuit carries out circuit conditioning, filtering, AD conversion, Fourier Transform Algorithm calculate S signal by high pressure clamp meter master control borad.
5. the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode according to claim 3, it is characterized in that: in described step 4, inspection APP software carries out wireless connections by the WiFi signal receiver module in intelligent palm terminal PDA and the WiFi signal output module in high pressure clamp meter, and the S signal detection signal value that described high pressure clamp meter detects is kept in the limit phase data memory module in intelligent palm terminal PDA.
6. the visiting method of the S signal injection location inspection system of a kind of three-phase short circuit injection mode according to claim 5, is characterized in that: described step 5 is further comprising the steps of:
Step 51: under injection S signal conditioning, use described high pressure clamp meter to measure the side three-phase S signal value injecting S signaling point both sides successively, if this side any two-phase of three-phase S signal value is more or less the same in 2mA, can judge that this side is no ground; If wherein two-phase S signal value is more or less the same in 2mA, and another phase value is much larger than the value of this two-phase, then can judge this side to ground connection and earth point go up mutually at maximum detection signal;
Step 52: adopt dichotomy to carry out measurement in the midpoint of fault section and judge, the localization of faults is in the position of fault section mid point, measured by high pressure clamp meter and inject one, S signaling point side limit phase, high pressure clamp meter will measure S signal value and be transmitted to intelligent palm terminal PDA by WiFi signal output module, and leave in the phase data memory module of limit by the S signal value detected;
Step 53: choose limit phase data memory module, stores in the data retransmission in data memory module to limit phase data memory module, and activate limit phase data, intelligent palm terminal PDA provides the judged result in earth point direction;
Step 54: the result detected also is preserved in initialization interface, adopts dichotomy to continue to select fault section midpoint to carry out judging until determine earth point position.
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