CN105974244B - A kind of operation cable grounding condition detection method divided using frequency conversion resonance vibration - Google Patents
A kind of operation cable grounding condition detection method divided using frequency conversion resonance vibration Download PDFInfo
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- CN105974244B CN105974244B CN201610503824.XA CN201610503824A CN105974244B CN 105974244 B CN105974244 B CN 105974244B CN 201610503824 A CN201610503824 A CN 201610503824A CN 105974244 B CN105974244 B CN 105974244B
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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
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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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
-
- 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
-
- 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
- G01R31/58—Testing of lines, cables or conductors
Abstract
The present invention proposes a kind of operation cable grounding state detection circuit and its detection method using frequency conversion resonance vibration partial pressure.The detection circuit is used to measure on the ground line of power cable steel sheath the end A to the ground state between the end B, including variable-frequency high-frequency signal source, LC resonance circuit unit and voltage signal acquisition unit；The end the B ground connection, the high-frequency signal source is in parallel with LC resonance circuit unit, and an end of parallel-connection structure is connected to the end A, other end ground connection, for realizing the resonance with high-frequency signal source frequency；Voltage signal acquisition unit is for acquiring LC resonance circuit unit both end voltage.The circuit structure is simple, and cost of implementation is low, can simply and effectively detect operation Steel armor of cable layer ground state.
Description
Technical field
The present invention relates to a kind of detection circuits and detection method for running cable grounding state.
Background technique
Underground power cable is safe and reliable and can significantly improve urban electricity supply line environment, supplies in urban power distribution network
In electric mode, the power supply mode of overhead transmission line has been gradually replaced.Currently, the usage amount of buried cable is far beyond aerial
The usage amount of route.As power cable quantity sharply increases in power grid, the failure of cable also accordingly increases.
Cable is generally all laid in underpass, during daily operation management, other than cable failure itself, and people
The phenomenon that steal or destroying cable outer layer, is also extremely serious.Have when pressing 10kV power cable shield layer by stripping phenomenon in especially
Occur, the failure of this artificial destruction has largely caused very big personnel's economic loss to electric power network.
In response to this, domestic at present to occur various types of low-voltage lighting cable alarm systems, overhead line in succession
Cable anti-theft alarm system, power failure Stealing-proof Alarming System for Power Cable, but for the burglar alarm of middle pressure 10kV operation power cable
And fault positioning products are fewer and fewer.Universal power cable anti-theft device only realizes the detection of operation cable grounding state,
But specific location when being difficult to operation cable grounding system by broken ring positions.Using between power cable shield and ground
The high frequency signal transmission channel progress power cable of formation is antitheft, when the high-frequency signal formed between power cable steel sheath and ground
When transmission channel is by destroying, indicate that monitored cable has abnormal same alarm.
But because bringing to the operation of power cable can not to other media have been accessed in power cable shield layer
By factor.Meanwhile the monitored power cable that must stop transport when in-site installation, change the mounting structure of original power cable, it is time-consuming
Arduously be inconvenient to install.
Summary of the invention
The present invention proposes a kind of circuit system of new realization operation cable grounding state-detection, can be simply and effectively
Detection operation cable grounding state.
Technical scheme is as follows:
A kind of operation cable grounding state detection circuit of frequency conversion resonance vibration partial pressure mode, for measuring power cable steel sheath
Ground line on the end A to the ground state between the end B, including variable-frequency high-frequency signal source, LC resonance circuit unit and voltage
Signal acquisition unit；The end the B ground connection, the high-frequency signal source is in parallel with LC resonance circuit unit, a termination of parallel-connection structure
To the end A, other end ground connection, for realizing the resonance with high-frequency signal source frequency；Voltage signal acquisition unit is for acquiring
LC resonance circuit unit both end voltage.
In above-mentioned LC resonance circuit unit, the impedance of L is more preferably less than 1 ohm, and the swept frequency range of high-frequency signal source is in 1KHz
Between~20KHz.
The method that operation cable grounding state-detection is realized using foregoing circuit, comprising the following steps:
(1) normal data of complete power cable steel sheath ground state is obtained
The power cable intact for steel sheath is first ensured that in cable under stoppage in transit state, the steel of hanging cable termination
Sheath is grounded (i.e. the end cable B is earth-free at this time), and then high-frequency signal source is looked for by variable-frequency scanning according to formula (1) automatically
To resonance frequency f, the voltage magnitude and record of the LC resonance circuit unit of voltage signal acquisition unit measurement at this time, while recording guarantor
It is constant to hold frequency f；
Formula (1):
(2) real-time monitoring power cable state
For operation power Steel armor of cable layer ground state to be measured, the resonance frequency of high-frequency signal source injection step (1) record
Rate f, voltage signal acquisition unit measure the voltage magnitude of LC resonance circuit unit, if the voltage is less than the electricity of step (1) record
Pressure amplitude value then determines that the power cable steel sheath ground state has breakage；
(3) cable disconnects the positioning of abort situation
High-frequency signal source finds new resonance frequency f ' by frequency sweep again, and voltage signal acquisition unit measures LC resonance
The optimum voltage amplitude of circuit unit records resonance frequency f ' at this time, the variable quantity of capacitor C is calculated according to formula (1), in conjunction with
Every kilometer of the cable distributed capacitance to the earth finally obtains cable open position.
The invention has the following advantages that
Circuit structure is simple, and cost of implementation is low, can simply and effectively detect operation Steel armor of cable layer ground state.
Real-time monitoring does not influence the normal operation of cable.
It being capable of quick energy accurate judgement abort situation.
The system for being applicable to a variety of two sides earths such as 6kV, 10kV, 35kV, it is versatile, adaptive surface is wide.
Detailed description of the invention
Fig. 1 is measuring principle schematic diagram of the invention.
Wherein, 1- power cable, 2- high-frequency signal source (variable ratio frequency changer adjusting).
Specific embodiment
Measuring principle of the present invention is as shown in Figure 1, be to utilize the high-frequency signal formed between power cable steel sheath and the earth
Circuit is transmitted, the calculating of accurately operation cable grounding state and fault location is realized by frequency conversion resonance vibration principle.
Vf is variable frequency signal source in Fig. 1, R0 is singal source resistance, L is high pressure that impedance less than 1 ohm inductance, C are and connect
Distribution capacity (distribution capacity and its length are substantially in a linear relationship) between power cable steel sheath and the earth of capacitor, Cx,
Vx is the both end voltage (voltage magnitude) of the LC resonance circuit unit of voltage signal acquisition unit measurement.Variable frequency signal source is humorous with LC
The circuit unit that shakes is in parallel, is integrally serially connected in the ground line of power cable steel sheath to be measured, and voltage signal acquisition unit is for adopting
Collection LC resonance circuit unit both end voltage is simultaneously sent to data processing unit.
The resonance with high-frequency signal source frequency may be implemented in the parallel relationship of capacitor C, distribution capacity Cx.Negligible high frequency
Influence of the R0 to LC resonance circuit in signal source, the impedance of LC are less than 1 ohm, therefore obtain inductance L in power frequency 50Hz environment
Under maximum value, while the swept frequency range of high-frequency signal source is between 1KHz~20KHz.
Formula (1):
Formula (2): XL=2 π f*L
When power cable steel sheath ground state changes (such as somewhere open circuit), the Vx value real-time monitored and normal
Centainly great changes have taken place by Vx under ground state.By comparing the processing that Vx changes, it can effectively judge that power cable is
It is no to have disengagement failure, it specifically can be by the collected digital signal of high speed processor, at the equivalent network model algorithm by foundation
Reason and data feature values compare, and the disengagement failure of power cable steel sheath can be obtained.
This method that power cable real-time monitoring is carried out using frequency conversion resonance vibration partial pressure mode, comprising the following steps:
(1) normal data of complete power cable steel sheath ground state is obtained
The power cable intact for steel sheath is first ensured that in cable under stoppage in transit state, the steel of hanging cable termination
Sheath ground line, then variable frequency signal source searches out resonance frequency f, at this time voltage signal acquisition according to formula 1 by frequency sweep
Unit measures the voltage magnitude and record of LC resonance circuit unit, while recording and keeping frequency f constant.
Formula 1:
(2) real-time monitoring power cable state
For operation power Steel armor of cable layer ground state to be measured, variable frequency signal source injects the frequency recorded under serviceable condition
F, voltage signal acquisition unit measure the voltage magnitude of LC resonance circuit unit, if the voltage is less than the voltage of step (1) record
Amplitude then determines that the power cable steel sheath ground state has breakage, issues alarm.
(3) cable disconnects the positioning of abort situation
When for operation power Steel armor of cable layer to be measured by artificial destruction, variable frequency signal source passes through frequency sweep again, foundation
Formula 1, searches out new resonance frequency f, and voltage signal acquisition unit measures the optimum voltage amplitude of LC resonance circuit unit, note
Frequency at this time is recorded, the variable quantity Cx of C is calculated according to formula 1, in conjunction with every kilometer of the cable distributed capacitance to the earth, final
To cable open position.
Claims (2)
1. a kind of detection method for running cable grounding state, the end A to the end B on the ground line for measuring power cable steel sheath
Between ground state, it is characterised in that: the detection circuit built includes variable-frequency high-frequency signal source, LC resonance circuit unit
With voltage signal acquisition unit；The end the B ground connection, the high-frequency signal source is in parallel with LC resonance circuit unit, parallel-connection structure
One end is connected to the end A, other end ground connection, for realizing the resonance with high-frequency signal source frequency；Voltage signal acquisition unit is used
In acquisition LC resonance circuit unit both end voltage；
Detection method includes the following steps for this:
(1) normal data of complete power cable steel sheath ground state is obtained
The power cable intact for steel sheath first ensures that cable under stoppage in transit state, and the steel sheath of hanging cable termination connects
Ground wire, then high-frequency signal source is automatically found resonance frequency f, voltage signal is adopted at this time according to formula (1) by variable-frequency scanning
Collect the voltage magnitude and record of unit measurement LC resonance circuit unit, while recording and keeping frequency f constant；
Formula (1):
(2) real-time monitoring power cable state
For operation power Steel armor of cable layer ground state to be measured, the resonance frequency f of high-frequency signal source injection step (1) record,
Voltage signal acquisition unit measures the voltage magnitude of LC resonance circuit unit, if the voltage is less than the voltage amplitude of step (1) record
Value, then determine that the power cable steel sheath ground state has breakage；
(3) cable disconnects the positioning of abort situation
High-frequency signal source finds new resonance frequency f ' by frequency sweep again, and voltage signal acquisition unit measures LC resonance circuit
The optimum voltage amplitude of unit records resonance frequency f ' at this time, the variable quantity of capacitor C is calculated according to formula (1), in conjunction with cable
Every kilometer of distributed capacitance to the earth finally obtains cable open position.
2. the detection method of operation cable grounding state according to claim 1, it is characterised in that: the LC resonance circuit
In unit, the impedance of L is less than 1 ohm, and the swept frequency range of high-frequency signal source is between 1KHz~20KHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610503824.XA CN105974244B (en) | 2016-06-29 | 2016-06-29 | A kind of operation cable grounding condition detection method divided using frequency conversion resonance vibration |
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| CN201610503824.XA CN105974244B (en) | 2016-06-29 | 2016-06-29 | A kind of operation cable grounding condition detection method divided using frequency conversion resonance vibration |
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| CN105974244B true CN105974244B (en) | 2018-12-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707087B (en) * | 2017-02-04 | 2024-04-05 | 山西全安新技术开发有限公司 | Underground electrical equipment grounding monitoring method and system |
| CN107340416B (en) * | 2017-08-28 | 2020-04-14 | 国网江西省电力公司电力科学研究院 | LC tuning external application signal source of power distribution network fault indicator |
| CN111239542B (en) * | 2020-02-03 | 2021-05-25 | 华北电力大学 | Photovoltaic direct current collection branch fault positioning method based on high-frequency resonance identification |
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|---|---|---|---|---|
| JP2001051006A (en) * | 1999-08-05 | 2001-02-23 | Ntt Advanced Technology Corp | Method of contrasting coaxial cables |
| CN203117325U (en) * | 2013-02-01 | 2013-08-07 | 西安秦骊成套电器有限公司 | Operating cable grounding state detecting circuit in dc measurement manner |
| CN203117345U (en) * | 2013-02-01 | 2013-08-07 | 西安秦骊成套电器有限公司 | Circuit detecting grounding state of operating cable via high-frequency signal injection |
| CN103337119A (en) * | 2013-06-08 | 2013-10-02 | 山东康威通信技术股份有限公司 | Burglary-resisting monitoring and positioning method for armored cable |
| CN103646488A (en) * | 2013-11-21 | 2014-03-19 | 广东电网公司惠州供电局 | An armored cable monitoring system and a method |
| CN206132867U (en) * | 2016-06-29 | 2017-04-26 | 西安秦骊成套电器有限公司 | Utilize operation cable grounding state detection circuitry of frequency conversion resonance partial pressure |
-
2016
- 2016-06-29 CN CN201610503824.XA patent/CN105974244B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001051006A (en) * | 1999-08-05 | 2001-02-23 | Ntt Advanced Technology Corp | Method of contrasting coaxial cables |
| CN203117325U (en) * | 2013-02-01 | 2013-08-07 | 西安秦骊成套电器有限公司 | Operating cable grounding state detecting circuit in dc measurement manner |
| CN203117345U (en) * | 2013-02-01 | 2013-08-07 | 西安秦骊成套电器有限公司 | Circuit detecting grounding state of operating cable via high-frequency signal injection |
| CN103337119A (en) * | 2013-06-08 | 2013-10-02 | 山东康威通信技术股份有限公司 | Burglary-resisting monitoring and positioning method for armored cable |
| CN103646488A (en) * | 2013-11-21 | 2014-03-19 | 广东电网公司惠州供电局 | An armored cable monitoring system and a method |
| CN206132867U (en) * | 2016-06-29 | 2017-04-26 | 西安秦骊成套电器有限公司 | Utilize operation cable grounding state detection circuitry of frequency conversion resonance partial pressure |
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