CN202351373U - Power cable fault traveling wave distance measuring equipment - Google Patents
Power cable fault traveling wave distance measuring equipment Download PDFInfo
- Publication number
- CN202351373U CN202351373U CN2011204859092U CN201120485909U CN202351373U CN 202351373 U CN202351373 U CN 202351373U CN 2011204859092 U CN2011204859092 U CN 2011204859092U CN 201120485909 U CN201120485909 U CN 201120485909U CN 202351373 U CN202351373 U CN 202351373U
- Authority
- CN
- China
- Prior art keywords
- power cable
- fault
- speed
- mutually
- speed signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Locating Faults (AREA)
Abstract
Power cable fault traveling wave distance measuring equipment belongs to the field of power cable fault detection, and includes a to-be-detected power cable, a casing and a power source unit, wherein opposite terminals of a testing end of the to-be-detected power cable are short spliced. The equipment is characterized in that a high-speed signal acquiring and processing system is arranged in the casing; high frequency sensors are arranged at a fault phase and an intact phase of the testing end of the to-be-detected power cable respectively; the output ends of the high frequency sensors are connected with the input end of the high-speed signal acquiring and processing system; and an output end of the power source unit is connected with a power port of the high-speed signal acquiring and processing system. Through measuring the start point times of fault point breakdown traveling wave refection of the fault phase and the intact phase, the distance from the measuring point to the fault point can be calculated; the equipment has the advantages of simplicity and practicability, as well as convenience, accuracy and fastness for measurement, enables engineers and technicians to accurately judge the fault distance and restore rapidly, improves the power supply quality, and lowers the equipment cost.
Description
Technical field
The utility model belongs to the electrical equipment fault detection range; The power cable that is detected is the power cable of each electric pressure; And the single-phase earthing of power cable and the range finding result of double earthfault can be provided, be the capable ripple synchronous range finding of a kind of power cable fault device specifically.
Background technology
The cable that is used for electric power transfer and distribution is called power cable.The cable that is used for electric power transfer and distribution is called power cable.
Along with the progress of society and the development of industrial and agricultural production, cable consumption shared ratio in whole power transmission lines improves day by day, and cable is compared with overhead transmission line, has following major advantage:
1. send electric reliability high, be not subject to the influence of surrounding environment and pollution;
2. insulation distance is little between line, takes up an area of to lack noiseless electric wave;
3. during underground laying, do not take up an area of face and space, both safe and reliable, be difficult for again giving away one's position.
Because most power cables are laid in underground; Along with a large amount of uses of power cable in recent years; After cable breaks down; Searching fast and repairing of trouble spot becomes the focus that power supply unit is paid close attention to, and comparatively the common faults distance-finding method is main with bridge method, Pulse Electric platen press, pulse current method and second pulse method at present, and the whole bag of tricks brief introduction is following:
Traditional detection method
1) bridge method
Bridge method is a kind of classical method of testing.
The bridge method advantage be simple, convenient, degree of accuracy is high, does not need the artificial judgment waveform, know cable length after instrument can calculate fault distance automatically.But its shortcoming is not to be suitable for high resistant and flashover fault, because under the very high situation of fault resstance, electric current is very little in the electric bridge, the instrument of general sensitivity is difficult to survey, and in fact the cable fault major part belongs to high resistant and flashover fault.Another shortcoming of bridge method is to do loop processed to the opposite end of cable, generally is not easy to carry out for power cable opposite end loop.
2) action of low-voltage pulse reflectometry
The action of low-voltage pulse reflectometry is radar method again, is inspiration and the utility model that receives the World War II radar, and it finds range with the exomonental mistiming through observing the trouble spot reflected impulse.
The advantage of action of low-voltage pulse reflectometry is simply, intuitively, not know the primitive technology data such as exact length of cable.Can also easily discern the position of cable splice and take-off point according to the pulse-echo waveform.
The shortcoming of action of low-voltage pulse reflectometry is still can not be applicable to measure high resistant and flashover fault.
3) Pulse Electric platen press
The Pulse Electric platen press is claimed again to dodge the survey method, is a kind of high resistant and the flashover fault testing method that grows up in the sixties in last century.
This method punctures cable fault under the effect of high direct voltage or high voltage pulse signal, then, and through observing the time range finding of the capable ripple of sparking voltage round trip between observation point and trouble spot.A significant advantage of Pulse Electric platen press is not need high resistant and flashover fault are burnt, and directly utilizes fault to puncture the momentary pulse travelling wave signal that produces, and test speed is fast, and measuring process also obtains simplifying, and is the major progress of cable fault detect technology.
The shortcoming of Pulse Electric platen press is a poor stability, and instrument is through capacitance resistance voltage divider dividing potential drop measuring voltage travelling wave signal, and instrument and high tension loop have electric coupling, are easy to take place high-voltage signal and seal in, and cause instrument damage.Fault distance is confirmed in reflection through failure cable voltage traveling wave signal, exists the user of service to need training, and the waveform identification needs a large amount of experience accumulation.
4) pulse current method
Pulse current method is a kind of method of testing that last century, early eighties grew up on the basis of Pulse Electric platen press, and this method has safety, reliable, advantage such as wiring is simple.The difference of pulse current method and Pulse Electric platen press is: measure the current traveling wave signal that produces when cable fault punctures through the linear current coupling mechanism, realized the electric coupling characteristic of instrument and high tension loop, the security of fault test equipment is greatly improved.Pulse current method is simple because of wiring, and along with development of electronic technology, the raising of measuring accuracy is that most power consumers use at present.This method also exists the current traveling wave signal to discern automatically at present, and the user of service need train and accumulate the problem that fault distance could accurately distinguished and distinguish to a large amount of on-site experiences.
5) second pulse method (multiple pulses method)
Second pulse method (multiple pulses method) is the new method of the power cable fault range finding that begins to promote the use of the beginning of this century; This method combines the advantage of pulse current method and action of low-voltage pulse reflectometry, using high voltage pulse to puncture the moment of electric power Method of Cable Trouble Point, adopts to keep fault to prolong arc; Stadimeter is to failure cable injected pulse signal; Because the trouble spot is in short-circuit condition, the pulse travelling wave signal behind capable wave reflection signal that stadimeter receives and the breath arc has tangible difference, through the waveform comparison; The user of service can clearly distinguish fault distance, and the automatic range function of stadimeter is able to strengthen.The shortcoming of the method is on the basis of original pulse current testing apparatus, to have increased the multiple pulses coupling mechanism, has increased equipment cost.With respect to pulse current method, the testing apparatus price also has a lot of raisings, and for the continuous unsettled cable fault of arc, the method can't be tested.
In sum, for the power cable fault range finding, conventional detection all has limitation separately.
The utility model content
According to above deficiency of the prior art; The purpose of the utility model is to provide a kind of precision ranging that realizes power cable fault; Carry out the collection and the comparison of travelling wave signal through to power cable two or more identical the time; The equipment user of service of making is the failure judgement distance rapidly and accurately, to overcome the capable ripple synchronous range finding of the power cable fault device of the deficiency that has the power cable fault distance-finding method now.
The utility model solves the technical scheme that its technical matters adopted: the capable ripple synchronous range finding of power cable fault device; Comprise tested power cable, housing and power supply unit; The test lead opposite end short circuit of tested power cable; It is characterized in that: high-speed signal acquisition and disposal system are set in the housing; The fault of the test lead of tested power cable mutually with the intact high frequency sensors that is provided with respectively mutually, the output terminal of high frequency sensors connects the input end of high-speed signal acquisition and disposal system, the output terminal connection high-speed signal acquisition of power supply unit and the power port of disposal system.
During use; Fault that the high direct voltage pulse power connects tested power cable is set mutually with mutually intact; Through to tested power cable fault mutually with intact under the short-circuit condition of test point opposite end; Measure the starting point time of the fault phase and the capable wave reflection of intact trouble spot puncture mutually, calculate the distance of test point to the trouble spot.
Wherein preferred version is:
Described high-speed signal acquisition and disposal system comprise signal conditioner, high-speed a/d converter, FPGA, storer, processor and man-machine conversation device; The input end that is connected signal conditioner in the fault of tested power cable mutually with the intact output terminal that high frequency sensors is set respectively mutually respectively; The output terminal of signal conditioner connects the signal input part of FPGA respectively through high-speed a/d converter; The data terminal of FPGA is provided with connected storage; The data terminal of its output terminal connection processing device, the clock control end of FPGA connects two high-speed a/d converters respectively, and processor is provided with and connects the man-machine conversation device.Utilize fault mutually and the difference between the zero-time of the travelling wave signal of any one or more intact phase calculate the trouble spot distance; After the signal that High Frequency Current Sensor transmits is changed through signal condition and A/D; Carry out data storage, analysis; Through obtaining fault phase and intact capable wave characteristic figure mutually after the signal waveform processing of data handling system with travelling wave signal respectively, can show.When fault being applied mutually high pressure and causes fault to puncture; Gather travelling wave signal simultaneously with other intact High Frequency Current Sensor that are provided with mutually of same length cables loop mutually in fault; The zero-time of the travelling wave signal of the electro-magnetic transient signal that collects simultaneously is as calculating the basis of trouble spot from the test point distance.
The communication terminal of described processor can connect network through Ethernet chip.
The beneficial effect that the capable ripple synchronous range finding of the utility model power cable fault device is had is: through globality optimal design and processing, utilize this device to realize:
1, simple and practical, measure easy, accurate;
2, on the basis that does not roll up equipment cost, make engineering technical personnel can grasp the use of power cable fault distance-measuring equipment fast, accurately the failure judgement distance is repaired fast, improves power supply quality, reduces equipment cost;
3, adopt this device,, broken away from the problem that travelling wave signal is difficult to analyze, accelerate the innovation progress of cable fault detect equipment along with the accumulation of on-site experience;
4, to the fault localization of 110KV and above high-tension cable, this device has advantages such as obvious speed, accurate, convenient use than other existing distance-finding methods.
Description of drawings
Fig. 1 is the electrical schematic diagram of the utility model;
Fig. 2 is the high-speed signal acquisition of the utility model and the functional-block diagram of data handling system;
1,2, High Frequency Current Sensor 3, intact phase cable conductor 4, fault phase cable conductor 5, high voltage power cable 6, high-tension cable test earth terminal 7, the high direct voltage pulse power 8, fault locator 9,10, opposite end conductor 11, pulsed capacitance among the figure:.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done and to further describe:
Embodiment 1:
As shown in Figure 1; High-tension cable test earth terminal 6 is set; On the fault phase cable conductor 4 of high voltage power cable 5 and other any intact cable conductors mutually 3; Insert a High Frequency Current Sensor 1,2 respectively, and opposite end conductor 9,10 faults and intact short circuit mutually of the test lead other end, intact phase cable conductor 3 is through pulsed capacitance 11 ground connection; The high direct voltage pulse power 7 connects fault phase cable conductor 4; Use the high direct voltage pulse power 7 to adopt high direct voltage or high voltage pulse that fault is discharged mutually, the current traveling wave signal that two or more High Frequency Current Sensor 1,2 obtain is received by failure tester 8 simultaneously, becomes the raw data of analyzing and obtaining fault distance.
As shown in Figure 2; High-speed signal acquisition and disposal system comprise at least two high-speed signal acquisition unit and data analysis and disposal system with certain criteria, mainly comprise high frequency sensors, signal conditioner, high-speed a/d converter, FPGA, storer, processor, man-machine interface.The output terminal of high frequency sensors connects the input end of signal conditioner, and the output terminal of signal conditioner passes through high-speed a/d converter respectively.The output terminal of high-speed a/d converter connects the signal input part of FPGA.The data terminal of FPGA is provided with connected storage, the data terminal of its output terminal connection processing device, and FPGA provides synchronous clock for the two-way high-speed a/d converter.The communication terminal of processor connects man-machine interface.
High frequency sensors is High Frequency Current Sensor.
The data terminal of processor is provided with the man-machine conversation device, and display and printer can be set as required, also printer, colour band, pilot lamp or loudspeaker can be set.
FPGA is the FPGA gate array, comprises high-speed a/d interface, threshold logic control, dynamic RAM interface, command register and processor interface composition, and its modular structure mode is common prior art.During use, the high-speed a/d interface connects the output terminal of high-speed a/d converter, threshold logic control linkage high-speed comparator, and dynamic memory interface (DMI) connects dynamic storage DRAM, the input end of processor interface connection processing device.
The network of mentioning in the utility model that packet is carried out compiles, analyzes and handles, and the setting of processor and FPGA, input, storage and use are by professionals such as common computer and Electrical Engineer are grasped.
Principle of work and process:
The cutoff frequency that is collected by two above High Frequency Current Sensor is greater than the electro-magnetic transient signal of 2MHz; Through signal conditioning circuit gain the adjustment and LPF give high-speed a/d converter; Carry out Time Calculation at the scene under the control of FPGA gate array and handle, processor is through interrupting obtaining the data effective information, through algorithm process; Perhaps show information such as fault distance, data are uploaded to host computer with network communication mode through Ethernet through good man-machine interface.The user can also compile through network, single calling except monitoring running status on unit, analyzes and handles.
The concrete steps of range finding are:
Step 1: with the fault of tested power cable mutually and intact test lead mutually to terminal shortcircuit; It is the other end of test lead; Fault at the test lead of tested power cable is provided with High Frequency Current Sensor respectively with intact going up mutually mutually; The output of this High Frequency Current Sensor is connected to a high-speed signal acquisition and data handling system, and said high-speed signal acquisition and data handling system comprise at least two high-speed signal acquisition unit and data storage analysis and disposal system;
Step 2: the fault to tested power cable applies high-voltage dc voltage mutually, causes the trouble spot to puncture;
Step 3: utilize be arranged on tested power cable fault mutually with the intact High Frequency Current Sensor that goes up mutually and high-speed signal acquisition unit, detect simultaneously with write down tested power cable fault mutually with time of the travelling wave signal arrival test point of intact phase factor trouble spot puncture generation;
Step 4: utilize described data storage analysis and disposal system; Utilize step 3 detection and the tested power cable fault that obtains of record mutually with mistiming of the zero-time of intact two travelling wave signals mutually, to the trouble spot of tested power cable apart from calculating and handling.
Because the velocity of propagation of travelling wave signal in power cable is certain value V; Two asynchronism(-nization)s that the detected travelling wave signal of high frequency sensors reaches; Be set at t1 and t2, its mistiming is Δ t, Δ t=t2-t1; Known tested power cable total length is L, utilizes formula: X=L-(Δ t*V)/2 calculates the trouble spot distance X.
The described high-voltage DC power supply of the utility model is a kind of mode that the trouble spot punctures; Be used for just explaining that the trouble spot of the utility model punctures generation row wave process phenomenon; Other are in the claim scope of the utility model as breakdown fault point power of alterating and direct current mode.
The technician in present technique field recognizes because of this that above embodiment is used for explaining the utility model, and is not the qualification that is used for doing the utility model.As long as in the connotation scope of the utility model, to the modification of the above embodiment, change and all will drop in the claim scope of the utility model.
Claims (3)
1. the capable ripple synchronous range finding of power cable fault device; Comprise tested power cable, housing and power supply unit; The test lead opposite end short circuit of tested power cable; It is characterized in that: high-speed signal acquisition and disposal system are set in the housing; The fault of the test lead of tested power cable mutually with the intact high frequency sensors that is provided with respectively mutually, the output terminal of high frequency sensors connects the input end of high-speed signal acquisition and disposal system, the output terminal connection high-speed signal acquisition of power supply unit and the power port of disposal system.
2. the capable ripple synchronous range finding of power cable fault according to claim 1 device; It is characterized in that: described high-speed signal acquisition and disposal system comprise signal conditioner, high-speed a/d converter, FPGA, storer, processor and man-machine conversation device; The input end that is connected signal conditioner in the fault of tested power cable mutually with the intact output terminal that high frequency sensors is set respectively mutually respectively; The output terminal of signal conditioner connects the signal input part of FPGA respectively through high-speed a/d converter; The data terminal of FPGA is provided with connected storage; The data terminal of its output terminal connection processing device, the clock control end of FPGA connects two high-speed a/d converters respectively, and processor is provided with and connects the man-machine conversation device.
3. the capable ripple synchronous range finding of power cable fault according to claim 2 device is characterized in that: the communication terminal of described processor can connect network through Ethernet chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204859092U CN202351373U (en) | 2011-11-29 | 2011-11-29 | Power cable fault traveling wave distance measuring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204859092U CN202351373U (en) | 2011-11-29 | 2011-11-29 | Power cable fault traveling wave distance measuring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202351373U true CN202351373U (en) | 2012-07-25 |
Family
ID=46540369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204859092U Expired - Lifetime CN202351373U (en) | 2011-11-29 | 2011-11-29 | Power cable fault traveling wave distance measuring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202351373U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048588A (en) * | 2012-12-14 | 2013-04-17 | 广州供电局有限公司 | Method and system for on-line locating power cable fault |
| CN103472361A (en) * | 2013-09-18 | 2013-12-25 | 上海申贝科技发展有限公司 | Power transmission line fault positioning system based on space signal detection and high-precision time service |
| CN106932689A (en) * | 2015-12-31 | 2017-07-07 | 淄博威特电气有限公司 | A kind of power cable fault voltage traveling wave distance-finding method |
| CN107748317A (en) * | 2017-11-29 | 2018-03-02 | 电子科技大学 | A kind of Precise Position System of buried cable high resistive fault |
| CN113884808A (en) * | 2021-09-28 | 2022-01-04 | 华北电力大学（保定） | Cable fault detection system and fault positioning method thereof |
-
2011
- 2011-11-29 CN CN2011204859092U patent/CN202351373U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048588A (en) * | 2012-12-14 | 2013-04-17 | 广州供电局有限公司 | Method and system for on-line locating power cable fault |
| CN103048588B (en) * | 2012-12-14 | 2015-05-13 | 广州供电局有限公司 | Method and system for on-line locating power cable fault |
| CN103472361A (en) * | 2013-09-18 | 2013-12-25 | 上海申贝科技发展有限公司 | Power transmission line fault positioning system based on space signal detection and high-precision time service |
| CN103472361B (en) * | 2013-09-18 | 2016-08-17 | 上海申贝科技发展有限公司 | Based on Spatial Signal Detection and the transmission open acess system of high accuracy time service |
| CN106932689A (en) * | 2015-12-31 | 2017-07-07 | 淄博威特电气有限公司 | A kind of power cable fault voltage traveling wave distance-finding method |
| CN107748317A (en) * | 2017-11-29 | 2018-03-02 | 电子科技大学 | A kind of Precise Position System of buried cable high resistive fault |
| CN107748317B (en) * | 2017-11-29 | 2019-10-29 | 电子科技大学 | A kind of Precise Position System of buried cable high resistive fault |
| CN113884808A (en) * | 2021-09-28 | 2022-01-04 | 华北电力大学（保定） | Cable fault detection system and fault positioning method thereof |
| CN113884808B (en) * | 2021-09-28 | 2023-11-10 | 华北电力大学（保定） | Cable fault detection system and fault positioning method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102435915B (en) | Power cable fault traveling wave synchronization range finding method | |
| CN202351373U (en) | Power cable fault traveling wave distance measuring equipment | |
| CN102809715B (en) | On-line fault location device for high-voltage power cable | |
| CN102798804B (en) | High-voltage power cable fault on-line positioning device | |
| CN104655984A (en) | Method for testing power cable fault | |
| CN101701995A (en) | Impulse response analytical test apparatus and method for detecting deformation of transformer winding | |
| CN112630585B (en) | Distribution cable partial discharge live detection system and detection method | |
| CN102520316A (en) | Method for quickly and accurately positioning fault point of cable | |
| CN104007384A (en) | Circuit breaker mechanical property test platform and test method | |
| CN108535598A (en) | A kind of track circuit cable fault online test method and device | |
| CN109884467B (en) | Device and method for insulating fault positioning of insulating tubular bus | |
| CN105182199A (en) | High-voltage cable partial discharge online monitoring and discharge position positioning system and method | |
| CN202057758U (en) | Wire cable fault diagnosis apparatus system | |
| CN204044291U (en) | Based on the online fault locator of GPS and 3G telecommunication cable | |
| CN115575777A (en) | Medium-voltage cable state online monitoring method and system | |
| CN112083263A (en) | Multi-source data fusion high-voltage cable line fault online positioning device and method based on traveling wave principle | |
| CN108169612A (en) | The localization method of overhead line DC transmission system DC short trouble | |
| CN102495334B (en) | Multitrace traveling wave distance measurement method for power cable faults | |
| CN106771843B (en) | Fault traveling wave distance measurement method for single-core power cable | |
| CN202351372U (en) | Multi-trace travelling wave ranging device for power cable faults | |
| CN204462307U (en) | Based on the cable-transmission line fault section location system of synchronized sampling | |
| CN115113004A (en) | Distribution network overhead line and equipment local discharge live detection device and method along line | |
| CN112379220B (en) | Ground fault positioning system and method based on distribution transformer injection pulse | |
| CN112345978B (en) | Ground fault positioning method based on distribution transformer low-voltage side two-phase injection pulse | |
| CN202710704U (en) | Online fault positioner for high-voltage power cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |
|
| CX01 | Expiry of patent term |