CN106872860A - Phase method is sentenced in a kind of cable run local discharge signal identification - Google Patents
Phase method is sentenced in a kind of cable run local discharge signal identification Download PDFInfo
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- CN106872860A CN106872860A CN201510925477.5A CN201510925477A CN106872860A CN 106872860 A CN106872860 A CN 106872860A CN 201510925477 A CN201510925477 A CN 201510925477A CN 106872860 A CN106872860 A CN 106872860A
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- signal
- current sensor
- high frequency
- local discharge
- phase
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
Abstract
Sentence phase method the invention provides a kind of identification of cable run local discharge signal, respectively according to grounding box in cable circuit it is openable in the case of and provide different identifications in the case of can not opening and sentence phase method, physical adjustment is carried out to the transmission path through high-frequency signal in cross connection grounding cable system on the basis of original earthed system structure is not changed, using with interference signal before and after regulation the characteristics of transportation law in cable system and difference, can easily realize that the identification of signal is sentenced mutually and possesses the repeatability of testing result, it is easy to live live detection personnel to grasp and application, the deployment cost of live detection equipment can effectively be reduced.
Description
Technical field
The present invention relates to T ＆ D Technology, and in particular to the high-voltage crosslinking electricity under a kind of cross connection grounding mode
Phase method is sentenced in the local discharge signal identification of cable road.
Background technology
Between in the cable high-frequency electrical is used on the ground outlet of the annex such as joint, cable termination or cross interconnected line
Flow sensor carries out signal coupling detection high-tension cable, and cable run is up to dozens of kilometres, geographical position span
Greatly, often it is spaced more than 400m between adjacent transition joint, live live detection is limited to cable laying with inspection
Survey the limitation of the conditions such as environment, it is difficult to general survey is implemented to whole joints, so as to cause test point and actual discharge
Distance between position is even farther up to hundreds of meters；Additionally, for signal produced by cable body insulation defect,
Signal at detection tabs is also resulted in certain space length between test point and actual discharge position.
There is the earthing mode of three-phase cross connection grounding in Voltage Cable Lines Construction system, this earthing mode is not
Only so that the signal route of transmission in single-phase cable becomes increasingly complex, and signal can be due to cross interconnected
Mutually go here and there mutually and be superimposed in the presence of and threephase cable circuit, cause the signal amplitude detected on threephase cable circuit
There is similitude with polarity, interference signal is easily mistaken for；Additionally, the electromagnetic interference signal at scene also can be therewith
Propagated in threephase cable, aggravate amplitude attenuation and the wave distortion of discharge signal, further increase scene letter
Number difficulty for differentiating, while so that the reduction of follow-up data results confidence level, to electric discharge type identification and
Cable status appraisal brings great difficulty.
The content of the invention
To overcome drawbacks described above, the invention provides the high-pressure cross-linking cable under a kind of cross connection grounding mode
Phase method is sentenced in line signal identification, sets up the high frequency signal transmission loop of pulse, before and after being formed by loop
Doubtful signal polarity can effectively, easily differentiate doubtful signal and local discharge signal with amplitude situation of change
The cable phase sequence at place.
To achieve the above object, the present invention provides following technical scheme：
Phase method is sentenced in a kind of cable run local discharge signal identification, and methods described comprises the following steps：
1) High Frequency Current Sensor is set on the cross connection grounding copper bar of openable grounding box；
2) cable run is detected with High Frequency Current Sensor；
3) when detecting abnormal signal, the detection parameter of fixed current sensor；
4) the electric capacity arm for being not less than 10nF using capacitance is bridged；
5) recognize local discharge signal and local discharge signal is carried out to sentence phase.
Methods described comprises the following steps：
A High Frequency Current Sensor) is set on the ground wire of not openable grounding box；
B) cable run is detected with High Frequency Current Sensor；
When C) detecting abnormal signal, the detection parameter of fixed current sensor；
D) it is respectively provided with the Capacitance Coupled sensing that capacitance is not less than 1nF in the both sides of insulating joint insulating flange
Device, and be connected with each other by short circuit copper strips；
E) recognize local discharge signal and local discharge signal is carried out to sentence phase.
Step 1) the cross connection grounding copper bar connects A-b phases, B-c phases and the C-a phases of three-phase electricity respectively.
Step 4) the electric capacity arm bridges A-a phases, B-b phases and the C-c phases of three-phase electricity successively.
Step 5) identification sentences and is mutually：After the bridging of electric capacity arm, High Frequency Current Sensor is detected under preset parameter
Abnormal signal it is constant, abnormal signal is electromagnetic interference；
After the bridging of electric capacity arm, the abnormal signal amplitude attenuation that High Frequency Current Sensor is detected under preset parameter
Or High Frequency Current Sensor is examined under preset parameter and is not measured abnormal signal；Believe extremely after removing the electric capacity arm
Number recover again, abnormal signal is the phase electricity of local discharge signal and local discharge signal from flying capcitor arm
Cable.
Step D) capacitive coupled sensors be successively set on A phases, B phases and C phases insulating joint insulation
The both sides of flange.
Step E) identification sentences and is mutually：It is high after the capacitive coupled sensors connection of insulating joint insulating flange both sides
The abnormal signal that frequency current sensor is detected under preset parameter is constant, and abnormal signal is electromagnetic interference；
After the capacitive coupled sensors connection of insulating joint insulating flange both sides, High Frequency Current Sensor is in fixation
The abnormal signal amplitude attenuation or High Frequency Current Sensor detected under parameter examined under preset parameter do not measure it is different
Regular signal；Abnormal signal is local discharge signal and local discharge signal from being provided with capacitive coupled sensors
Phase cable.
With immediate prior art ratio, beneficial effects of the present invention are as follows：
1. the present invention uses electric capacity arm or capacitive coupled sensors bridging means, is not changing original earthed system knot
Physical adjustment is carried out to the transmission path through high-frequency signal in cross connection grounding cable system on the basis of structure,
Using with interference signal before and after regulation the characteristics of transportation law in cable system and difference, can be easily real
The identification of existing signal is sentenced mutually and possesses the repeatability of testing result, it is adaptable to the band electric-examination of Voltage Cable Lines Construction
Survey.
2. the present invention is obvious using electric capacity arm or capacitive coupled sensors bridging means detecting signal variation, resists
Interference performance is strong, it is easy to which live live detection personnel grasp and application.
3. the present invention is used electric capacity arm or the cost of the more existing live detection equipment of capacitive coupled sensors cost
It is greatly reduced, can effectively reduces the deployment cost of live detection equipment.
Brief description of the drawings
Fig. 1 is that electric capacity arm bridges connection diagram；
Fig. 2 is capacitive coupled sensors connection diagram.
Wherein, 101- grounding boxes；102- overvoltage protection devices；The cross interconnected copper bars of 103-；104- high frequency electrics
Sensor；105- ground wires；106- cable connector ground outlets；107- electric capacity arms；201- cables；202-
Insulating joint；203- capacitive coupled sensors；204 short circuit copper strips；205- insulating joint insulating flanges.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
Phase side is sentenced in a kind of high-pressure cross-linking cable circuit local discharge signal identification under cross connection grounding mode
Method, is bridged using capacitive coupled sensors or electric capacity arm to cross interconnected structure, sets up shelf depreciation arteries and veins
The high frequency signal transmission loop of punching, front and rear doubtful local discharge signal polarity and amplitude is formed by the loop
Situation of change can at the scene under complicated electromagnetic interference environment effectively, easily differentiate doubtful local discharge signal
With the cable phase sequence where Partial Discharge Sources.
High-pressure cross-linking cable circuit local discharge signal under a kind of cross connection grounding mode proposed by the present invention
Method of discrimination proposes two sets of implementations for the difference of cable run grounding box way to manage.
Scheme one：Cable run grounding box is in situation about can open in cable run shelf depreciation live detection
Under, scheme is as follows：
According to Fig. 1：
(1) High Frequency Current Sensor 104 is installed on the cross interconnected copper bar 103 of cross connection grounding case 101
On, frequency-division section detection is carried out to cable run shelf depreciation situation using High Frequency Current Sensor 104.
(2) when in certain detection frequency range, it is found that three-phase exists with doubtful local discharge characteristic simultaneously, but its
When phase has the abnormal signal of similitude with amplitude, then doubtful signal is regarded as.
(3) capacitance is respectively adopted between the upper and lower terminal of A, B, C three-phase of grounding box 101 and is not less than 10nF
Electric capacity arm 107 carry out A-a phases, B-b phases and bridged with C-c phases, when between the upper and lower terminal of the earthed system of certain phase
After being bridged using electric capacity arm 107, the High Frequency Current Sensor 104 being placed on cross interconnected copper bar 103 exists
The doubtful signal cannot be detected under original setting or signal is produced and significantly decayed, remove signal after electric capacity arm 107
Recover again, it is determined that doubtful signal derives from the phase cable or its accessory internal；If electric capacity arm 107 is bridged
Afterwards, the High Frequency Current Sensor 104 being placed on cross interconnected copper bar can be detected under original setting
The doubtful signal or signal attribute are basically unchanged, it is determined that the doubtful signal is disturbed from environment electromagnetics.
Scheme two：Cable run grounding box is in the feelings that cannot be opened in cable run shelf depreciation live detection
Under condition, scheme is as follows：
According to Fig. 1-2：
(1) High Frequency Current Sensor 104 is installed on ground wire 105, using High Frequency Current Sensor 104
Frequency-division section detection is carried out to cable run shelf depreciation situation.
(2) when in certain detection frequency range, it is found that three-phase exists with doubtful local discharge characteristic simultaneously, but its
When phase has the abnormal signal of similitude with amplitude, then doubtful signal is regarded as.
(3) the both sides near-end of insulating joint insulating flange 205 in cable run A, B, C three-phase is adopted respectively
The capacitive coupled sensors 203 of 1nF are not less than with installation capacitance, the electric capacity coupling of same joint both sides is pointed to
Close sensor 203 carries out split-phase bridging using short circuit copper strips 204, when the insulating joint of certain phase cable 201 is exhausted
After lot or luck by which people are brought together orchid 205 both sides capacitive coupled sensors 203 are bridged, it is placed on cable run ground wire 105
High Frequency Current Sensor 104 cannot detect the doubtful signal under original setting or signal is produced and significantly decayed,
Then determine that doubtful signal derives from the phase cable or its accessory internal；If the insulating joint insulation method of cable 201
After blue 205 both sides capacitive coupled sensors 203 are bridged, it is placed in 105 on the line-to-ground line of cable 201
High Frequency Current Sensor 104 can detect the doubtful signal under original setting, it is determined that the doubtful letter
Number from environment electromagnetics interference.
It is to be understood that, present invention and specific embodiment are intended to prove technical side provided by the present invention
The practical application of case, should not be construed as limiting the scope of the present invention.Those skilled in the art are in this hair
Under bright spirit and principle are inspired, can various modifications may be made, equivalent or improve.But these change or repair
Change and applying in pending protection domain.
Claims (7)
1. phase method is sentenced in a kind of cable run local discharge signal identification, it is characterised in that：Methods described includes
Following steps：
1) High Frequency Current Sensor is set on the cross connection grounding copper bar of openable grounding box；
2) cable run is detected with High Frequency Current Sensor；
3) when detecting abnormal signal, the detection parameter of fixed current sensor；
4) the electric capacity arm for being not less than 10nF using capacitance is bridged；
5) recognize local discharge signal and local discharge signal is carried out to sentence phase.
2. phase method is sentenced in identification according to claim 1, it is characterised in that：Methods described includes as follows
Step：
A High Frequency Current Sensor) is set on the ground wire of not openable grounding box；
B) cable run is detected with High Frequency Current Sensor；
When C) detecting abnormal signal, the detection parameter of fixed current sensor；
D) it is respectively provided with the Capacitance Coupled sensing that capacitance is not less than 1nF in the both sides of insulating joint insulating flange
Device, and be connected with each other by short circuit copper strips；
E) recognize local discharge signal and local discharge signal is carried out to sentence phase.
3. phase method is sentenced in identification according to claim 1, it is characterised in that：Step 1) intersection
Interconnection grounding copper bar connects A-b phases, B-c phases and the C-a phases of three-phase electricity respectively.
4. phase method is sentenced in identification according to claim 1, it is characterised in that：Step 4) electric capacity
Arm bridges A-a phases, B-b phases and the C-c phases of three-phase electricity successively.
5. phase method is sentenced in identification according to claim 1, it is characterised in that：Step 5) recognize and sentence phase
For：After the bridging of electric capacity arm, the abnormal signal that High Frequency Current Sensor is detected under preset parameter is constant, different
Regular signal is electromagnetic interference；
After the bridging of electric capacity arm, the abnormal signal amplitude attenuation that High Frequency Current Sensor is detected under preset parameter
Or High Frequency Current Sensor is examined under preset parameter and is not measured abnormal signal；Believe extremely after removing the electric capacity arm
Number recover again, abnormal signal is the phase electricity of local discharge signal and local discharge signal from flying capcitor arm
Cable.
6. phase method is sentenced in identification according to claim 2, it is characterised in that：Step D) electric capacity
Coupling sensor is successively set on the both sides of the insulating joint insulating flange of A phases, B phases and C phases.
7. phase method is sentenced in identification according to claim 2, it is characterised in that：Step E) recognize and sentence phase
For：After the capacitive coupled sensors connection of insulating joint insulating flange both sides, High Frequency Current Sensor is in fixation
The abnormal signal detected under parameter is constant, and abnormal signal is electromagnetic interference；
After the capacitive coupled sensors connection of insulating joint insulating flange both sides, High Frequency Current Sensor is in fixation
The abnormal signal amplitude attenuation or High Frequency Current Sensor detected under parameter examined under preset parameter do not measure it is different
Regular signal；Abnormal signal is local discharge signal and local discharge signal from being provided with capacitive coupled sensors
Phase cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510925477.5A CN106872860B (en) | 2015-12-14 | 2015-12-14 | Cable line partial discharge signal identification and phase judgment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510925477.5A CN106872860B (en) | 2015-12-14 | 2015-12-14 | Cable line partial discharge signal identification and phase judgment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106872860A true CN106872860A (en) | 2017-06-20 |
| CN106872860B CN106872860B (en) | 2020-07-21 |
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ID=59178391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510925477.5A Active CN106872860B (en) | 2015-12-14 | 2015-12-14 | Cable line partial discharge signal identification and phase judgment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907780A (en) * | 2017-11-22 | 2018-04-13 | 安徽马钢设备检修有限公司 | A kind of cable seeking discrimination method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07159479A (en) * | 1993-12-07 | 1995-06-23 | Hitachi Cable Ltd | Partial discharge measuring method |
| CN102981106A (en) * | 2012-11-12 | 2013-03-20 | 华北电力大学 | Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge |
| CN103267931A (en) * | 2013-04-19 | 2013-08-28 | 国家电网公司 | Method for positioning intersecting interconnection cable intermediate head partial discharge |
| CN103344889A (en) * | 2013-07-02 | 2013-10-09 | 华北电力大学 | Method for measuring cable partial discharge by means of capacitor wire jumper |
-
2015
- 2015-12-14 CN CN201510925477.5A patent/CN106872860B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07159479A (en) * | 1993-12-07 | 1995-06-23 | Hitachi Cable Ltd | Partial discharge measuring method |
| CN102981106A (en) * | 2012-11-12 | 2013-03-20 | 华北电力大学 | Online inspection method of three-phase cross interconnected electric cable intermediate head partial discharge |
| CN103267931A (en) * | 2013-04-19 | 2013-08-28 | 国家电网公司 | Method for positioning intersecting interconnection cable intermediate head partial discharge |
| CN103344889A (en) * | 2013-07-02 | 2013-10-09 | 华北电力大学 | Method for measuring cable partial discharge by means of capacitor wire jumper |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907780A (en) * | 2017-11-22 | 2018-04-13 | 安徽马钢设备检修有限公司 | A kind of cable seeking discrimination method |
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| Publication number | Publication date |
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| CN106872860B (en) | 2020-07-21 |
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