CN208672742U - The device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination - Google Patents
The device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination Download PDFInfo
- Publication number
- CN208672742U CN208672742U CN201821094911.5U CN201821094911U CN208672742U CN 208672742 U CN208672742 U CN 208672742U CN 201821094911 U CN201821094911 U CN 201821094911U CN 208672742 U CN208672742 U CN 208672742U
- Authority
- CN
- China
- Prior art keywords
- cable
- skin
- core
- core wire
- buried
- 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.)
- Active
Links
Abstract
The utility model relates to a kind of devices of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination, it includes collection skin cable and micropotentiometer, collects and is equipped with two-core cable along collection skin cable louding on skin cable overhead surface, two-core cable and collection skin cable are isometric；Two-core cable includes a core wire and b core wire, a core wire both ends are respectively connected to a slide rheostat, the sliding end that becomes of two slide rheostats is connected with a core wire both ends respectively, the fixing end of two slide rheostats is connected with collection skin cable ends respectively, b core wire one end is connected with the fixing end of one of slide rheostat, the b core wire other end is connected with the sliding fixing end that becomes of another slide rheostat, micropotentiometer one end ground connection, the other end become end mounting by probe and the sliding of one of slide rheostat.The utility model can be avoided the deficiency of the conventional detection means used to above-mentioned cable high resistive fault, realize the non-destructive testing to the high resistive fault of buried skin effect current tracing system system.
Description
Technical field
The utility model relates to a kind of buried liquid medium transmission pipeline electric tracing fault-finding analytical equipments, and in particular to
A kind of lossless detection analytical equipment of the electric tracing high resistance earthing fault based on kelvin effect.
Background technique
It is usually that buried (every repeater span longest is reachable in the middle and long distance liquid transmission line of petrochemical industry
50 kilometers), the liquid medium dimension temperature of middle and long distance pipeline generallys use skin-effect electric heating system at present.
Conventional skin-effect electric heating system basic structure is: two-phase alternating current power supply will be born through transformer and control cabinet for power distribution
Voltage is carried to be added on collection skin heating cable；As load, collect skin heating cable and be serially connected in steel pipe, steel pipe end by cable and
Steel pipe securely crimps, and after head end passes to alternating current between cable and steel pipe, electric current returns to power supply using steel pipe along cable
End.
Load (ontology is collection skin heating cable and steel pipe) is buried after keeping the temperature with process pipe, and buried depth of pipeline depends on
In landform, when Pipeline Crossing Program river and highway bridge and culvert tunnel, buried depth locally will be more than 10 meters.
Buried skin-effect electric heating cable fault type divides three classes: buried cable is directly to steel pipe short circuit and low resistance event
Barrier, cable are to steel pipe high resistance failure, cable open circuit (broken string) failure.
Because collection skin heating cable and steel-tube construction are analogous to the metal armor layers of power cable core wire and cable, so electric power
Detection of cable fault method, which can cover, to be used in skin effect current tracing system systematic survey, i.e., according to different faults type can take it is following several
Kind means are detected:
(1) to collection skin cable to steel pipe short circuit metal and low resistance failure (less than 150 ohm), at the beginning of generalling use multimeter
It surveys and Wheatstone bridge method judges trouble location；
(2) to collection skin cable open circuit (broken string) failure, action of low-voltage pulse combination oscilloscope method can be used and survey capacitance current method
Judge trouble location；
(3) like logical phenomenon is not led to due to carbonization to steel pipe high resistance and fault point to collection skin cable, high pressure flashover can be used
Reflection configuration judgement and pickup method carry out fault location (the above-mentioned following attached drawing 1 of the third high resistance earthing fault).
In three of the above fault handling method, first two troubleshooting mode is nondestructive detecting for collection skin cable,
To the third fault-finding, then belong to and damage detection, i.e., applies high-voltage pulse disruptive discharge at failure to collection skin cable: every
Clock just injects high voltage pulse between cable core and insulating layer every few seconds；Since buried collection skin cable has firm steel pipe, outer
Face is also protected with the black jacket of such as polyurethane foaming thermal insulation material and polyethylene kind, the mechanical shock that electric discharge generates at cable fault
90% or more wave energy will be absorbed by soft insulating layer, remaining energy is decayed through steel pipe and the earth again, and ground pickup will be non-
Often difficult, especially field background noise can cover weak discharge sound；Boosting is had to when therefore detecting increases strength of discharge, this
The detection mode of sample is itself to damage detection to collection skin cable: will cause pulse shock energy in collection skin heating cable insulation
Measure accumulation and generate tree discharge and cause the decline of cable insulation grade, shorten cable service life consequence etc..
There is presently no a kind of test devices may be implemented to carry out non-destructive testing above-mentioned collection skin cable high resistive fault.
Utility model content
Technical problem to be solved in the utility model is that one kind is provided for the above-mentioned prior art based on idiostatic method original
The device of the buried skin-effect electric heating high resistance earthing fault of the non-destructive determination of reason, it can be avoided to above-mentioned cable high resistive fault
The deficiency of the conventional detection means (be easy secondary damage cable, expand cable fault) of use, is realized to buried skin effect current tracing system
The non-destructive testing of the high resistive fault of system.
A kind of the technical scheme in the invention for solving the above technical problem are as follows: buried kelvin effect electricity companion of non-destructive determination
The device of hot high resistance earthing fault, it includes collection skin cable, is equipped on collection skin cable overhead surface along collection skin cable louding double
Core cable, two-core cable and collection skin cable are isometric；Two-core cable includes a core wire and b core wire, and a core wire both ends are respectively connected to one
The sliding end that becomes of slide rheostat, two slide rheostats is connected with a core wire both ends respectively, the fixing end of two slide rheostats
It is connected respectively with collection skin cable ends, b core wire one end is connected with the fixing end of one of slide rheostat, and b core wire is another
One end is connected after sealing in a breaker and battery pack with the sliding fixing end that becomes of another slide rheostat；
Described device further includes a micropotentiometer, and micropotentiometer one end ground connection, the other end passes through probe and one of them is sliding
The rheostatic sliding end that becomes is moved to mount.
Preferably, probe includes × 1 and × 10 gears, micropotentiometer by probe × 10 gears and one of sliding
The rheostatic sliding end that becomes mounts.
Preferably, the core section of two-core cable is not less than 4mm2。
Preferably, the range of slide rheostat is 0~20 ohm.
Preferably, the voltage of battery pack is 1.5~12V.
Preferably, battery pack can adjust voltage by splitting.
Preferably, two-core cable having insulation sheath.
Compared with the prior art, the advantages of the utility model are:
The utility model collection skin cable hot systems buried to long-distance transport pipes (single channel circuit is up to 12 kilometers) institute is faulty
Nondestructiving detecting means completion can be used, and on the basis of conventional lossless bridge method, Low Voltage Impulse Method, utility model is a kind of
To the idiostatic method of high resistive fault, so that complete series cable fault can be handled by non-destructive testing, and the utility model is filled
It sets and is only calculated by tracing extrapolation, be not required to complicated and dangerous high-voltage capacitance discharge equipment, be not required to lay bare wire on the way, test
Period, traffic and construction were not disturbed in edge, so that it may judge simultaneously validation fault position.
Utility model device extends to the detection of buried armoured power cable high resistance earthing fault.
Detailed description of the invention
Fig. 1 is the signal of the buried skin-effect electric heating route of pipe line with high resistance earthing fault in the utility model embodiment
Figure.
Fig. 2 is the equipotential wiring schematic diagram of the utility model embodiment.
Fig. 3 is the equivalent circuit diagram of the utility model embodiment.
Fig. 4 is the linear extrapolation triangular graph of Fig. 3.
Fig. 5 is the schematic diagram for visiting lancing test core wire verifying buried cable trouble location.
Wherein:
Buried steel pipe 1, collection skin cable 2, cable earth fault point 3, terminal box 4, medium tube 5, water-proof heat-insulation layer 6, twin-core
Cable 7, slide rheostat 8, battery pack 9, breaker 10, micropotentiometer 11.
Specific embodiment
The utility model is described in further detail below in conjunction with figure embodiment.
As shown in Figure 1 and Figure 2, the buried skin-effect electric heating high resistance earthing fault of one of the present embodiment non-destructive determination
Device, it includes buried steel pipe 1, be coated in the buried steel pipe 1 collection skin cable 2, by ground relative elevation be 0 meter of EL,
Collection skin cable 2 has the cable earth fault point 3 of high resistance grounding failure (being greater than 150 ohm) in underground somewhere to buried steel pipe 1,
It is shaken with megameter and surveys the short circuit of display set skin cable pairs steel pipe；Collection 2 left and right ends of skin cable are provided with terminal box 4, buried steel
It is provided with medium tube 5 above pipe 1, water-proof heat-insulation layer 6 is provided with outside buried steel pipe 1 and medium tube 5；
Two-core cable 7, two-core cable 7 and buried pipeline are equipped with along the trend of buried steel pipe 1 on 1 overhead surface of buried steel pipe
Collection skin cable 2 in 1 is isometric；Two-core cable 7 includes a core wire and b core wire, and a core wire both ends are respectively connected to a slide rheostat
8, the sliding end that becomes of two slide rheostats 8 is connected with a core wire both ends respectively, and the fixing end of two slide rheostats 8 passes through company
Connecting terminal and connecting copper pipe are connected with the terminal box 4 at collection 2 both ends of skin cable respectively, and b core wire one end and one of sliding become
The fixing end of resistance device 8 is connected, and the b core wire other end is slided after sealing in a breaker 10 (i.e. switch K) and battery pack 9 with another
The sliding fixing end that becomes of dynamic rheostat 8 is connected；
Described device further includes a micropotentiometer 11, and 11 one end of micropotentiometer ground connection, the other end is one by probe and wherein
The sliding of a slide rheostat 8 becomes end mounting；
Probe includes × 1 and × 10 gears, micropotentiometer 11 by probe × 10 gears and one of sliding variable resistance
The sliding of device 8 becomes end mounting；
The core section of two-core cable 7 is not less than 4mm2；
The range of slide rheostat 8 is 0~20 ohm；
The voltage of battery pack 9 is 1.5~12V.
Principle of device:
Because having the collection skin cable of ground fault and ground two-core cable in parallel, and the two is moved towards consistent with length and (is disregarded
Absolute altitude goes up and down bring error), after adding DC voltage at the parallel connection both ends, then, the everywhere on buried collection skin cable
Current potential will have a corresponding points current potential identical with being tested on relief cable core wire on ground, when being inferred to land cable failure
For zero potential position, that is, it can determine whether that the corresponding position of underground collection skin cable is zero potential, i.e. fault point over the ground.
Detailed operation is as follows:
As shown in Fig. 2, by two-core cable, (core section is not less than 4mm2) moved towards along buried pipeline, in its upper portion of ground
Position is laid with (most with several kilometers), does not consider that subsurface level goes up and down bring error, then it is assumed that two-core cable and buried collection skin electricity
Cable is isometric.Then land cable both ends are respectively peeled off, a slide rheostat (0~20 is respectively accessed at a core wire therein both ends
Ohm range) it is sliding become end, then there are collection skin cable ends (in terminal box) the copper pipe pressure of ground fault in fixing end and underground
It connects.Then b core wire one end of two-core cable is connected with fixing end, the other end seals in a breaker, and (i.e. unidirectional open circuit is opened
Close), 1 dry cell batteries (1.5~12V) is and then concatenated, is then connected with slide rheostat fixing end；
Such as the equivalent circuit diagram of Fig. 3, micropotentiometer one end is grounded, the other end passes through × 10 gear probes and one of them
The slide-changing resistor device of cable endpoint is sliding to become end mounting；
Corresponding diagram 4, in conjunction with Fig. 3, the K that closes a switch (i.e. breaker), electric current becomes from power supply E (i.e. dry cell batteries) anode through sliding
R3, a core cable R2, sliding change R1 flow through and return to power supply E cathode, and the slide-changing resistor on both sides is slided into 20 Europe, micronormal from 0 Europe respectively
Meter (pass through 10 times decaying) by be recorded respectively 4 point P1 P2 P3 P4 different offset positions, because interlude is jacketed cable
Micropotentiometer is only surveyed in the sliding section that becomes, and the voltage bias of above-mentioned 4 points is exactly the opposite；
Constantly adjustment (reducing cell voltage) becomes 0 ohm of section nearby fixed (both sides are symmetrical) sliding, so that micropotentiometer refers to
Needle within full scale (but contrary)；It is sliding become 20 ohm it is fixed nearby, have that 2 are contrary but scale is inconsistent
2 current potentials, record the small data of one of scale, then symmetrical side it is mobile it is sliding become, record potentiometer is contrary but scale
The same data of value；
By Kirchhoff's law, flowing through the voltage drop of D.C. resistance with resistance value is linear change, and slide-changing resistor value
It can survey, cable a core resistance can be surveyed, then slide-changing resistor and cable core can calculate in proportion changes length.It then can both sides data setting one
After a known variables, it can be extrapolated to coordinate origin according to the proportionate relationship of triangle, the relative resistance for calculating coordinate origin is total
Value (left and right triangle is not the same value).
In the limiting case, for example, it is sliding become R1=0, sliding when becoming certain number in R3=range, micronormal is in respect of a zero-bit.
It by resistance ratio relationship, acquires cable and changes long proportionate relationship, according to two-core cable laying length, can be calculated
The position of zero potential.
Referring to Fig. 5, according to the zero potential position being calculated, × 1 grade of mounting micropotentiometer is changed with probe, pierces through twin-core electricity
Cable a core sees whether pointer deflects 0, to verify to the position.
By the transformation of R1 and R3, slide-changing resistor and a core wire resistance ratio relationship and scale accordingly next part skin are being grasped
After cable length corresponds to extension position, only in the measurement of cable ends and extrapolation, so that it may around intermediate long range a core wire
Wireline test is blindly pierced through, potentiometer zero potential position is obtained, so that it is determined that lower cable fault position.
In addition to the implementation, the utility model further includes having other embodiments, all to use equivalents or equivalent
The technical solution that alternative is formed, should all fall within the protection scope of the utility model claims.
Claims (7)
1. a kind of device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination, it is characterised in that: it includes collection skin
Cable (2), collect skin cable (2) overhead surface on along collection skin cable (2) trend be equipped with two-core cable (7), two-core cable (7) with
It is isometric to collect skin cable (2)；Two-core cable (7) includes a core wire and b core wire, and a core wire both ends are respectively connected to a slide rheostat
(8), the sliding end that becomes of two slide rheostats (8) is connected with a core wire both ends respectively, the fixing end of two slide rheostats (8)
It is connected respectively with collection skin cable (2) both ends, b core wire one end is connected with the fixing end of one of slide rheostat (8), b
The core wire other end seals in a breaker (10) and battery pack (9) and becomes fixing end phase with the sliding of another slide rheostat (8) afterwards
Connection；
Described device further includes a micropotentiometer (11), and micropotentiometer (11) one end ground connection, the other end is one by probe and wherein
The sliding of a slide rheostat (8) becomes end mounting.
2. a kind of device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination according to claim 1,
Be characterized in that: probe includes × 1 and × 10 gears, micropotentiometer (11) by probe × 10 gears and one of sliding become
It hinders the sliding of device (8) and becomes end mounting.
3. a kind of device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination according to claim 1,
Be characterized in that: the core section of two-core cable (7) is not less than 4mm2。
4. a kind of device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination according to claim 1,
Be characterized in that: the range of slide rheostat (8) is 0~20 ohm.
5. a kind of device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination according to claim 1,
Be characterized in that: the voltage of battery pack (9) is 1.5~12V.
6. a kind of device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination according to claim 5,
Be characterized in that: battery pack (9) can adjust voltage by splitting.
7. a kind of device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination according to claim 1,
It is characterized in that: two-core cable (7) having insulation sheath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821094911.5U CN208672742U (en) | 2018-07-11 | 2018-07-11 | The device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821094911.5U CN208672742U (en) | 2018-07-11 | 2018-07-11 | The device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208672742U true CN208672742U (en) | 2019-03-29 |
Family
ID=65826148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821094911.5U Active CN208672742U (en) | 2018-07-11 | 2018-07-11 | The device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208672742U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111736091A (en) * | 2020-05-27 | 2020-10-02 | 湖南省湘电试验研究院有限公司 | Unstable high-resistance ground fault simulation circuit based on RTDS platform and application method thereof |
-
2018
- 2018-07-11 CN CN201821094911.5U patent/CN208672742U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111736091A (en) * | 2020-05-27 | 2020-10-02 | 湖南省湘电试验研究院有限公司 | Unstable high-resistance ground fault simulation circuit based on RTDS platform and application method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Benato et al. | An online travelling wave fault location method for unearthed-operated high-voltage overhead line grids | |
| CN103487727B (en) | A kind of high voltage power cable oversheath On-line Fault localization method | |
| Khan et al. | A review of condition monitoring of underground power cables | |
| Long et al. | Online monitoring of substation grounding grid conditions using touch and step voltage sensors | |
| Amberg et al. | Validating transmission line impedances using known event data | |
| CN208672742U (en) | The device of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination | |
| CN103323694B (en) | A kind of grounding net of transformer substation conductor disappearance detection method | |
| Minullin et al. | Model and experimental detection of single phase-to-earth faults of overhead conductors in 6–10 kV distribution circuits by a location method | |
| Pillai et al. | A review on testing and evaluating substation grounding systems | |
| CN108828408A (en) | The device and method of the buried skin-effect electric heating high resistance earthing fault of non-destructive determination | |
| Lee et al. | Insulation characteristics and fault analysis of HTS cable via stepped frequency waveform reflectometry | |
| Askarov et al. | Induction Method for Parameters Control of Cable Lines laying at the Electricity Distribution Network Polygon | |
| Rengaraj et al. | Identification and classification of faults in underground cables–A review | |
| Nyamupangedengu et al. | Effect of temperature variations on wave propagation characteristics in power cables | |
| Yamashita et al. | Study on Location Accuracy of Partial Discharge Locator | |
| Dzhala et al. | Information Technology of Surveys and Diagnostics of Underground Pipelines | |
| Hartlein et al. | Diagnostic testing of underground cable systems (Cable Diagnostic Focused Initiative) | |
| Li et al. | A new method for on-line cable tanδ monitoring | |
| AU3555201A (en) | Method and device for controlling a telecommunication cable | |
| Binot et al. | Impact of environmental conditions on the voltage profile of LV networks | |
| CN213337816U (en) | Ground resistance detection device | |
| Alam et al. | Rod Insertion TDR for Detecting Corrosion Damage in Vertical Grounding Electrodes | |
| Touaibia et al. | Cable fault location in medium voltage of Sonelgaz underground network | |
| Bascom et al. | Power cable failure modes and fault location methods, practices and strategies | |
| Gajbhiye et al. | Cable fault monitoring and indication: A review |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |