CN203117325U - Operating cable grounding state detecting circuit in dc measurement manner - Google Patents
Operating cable grounding state detecting circuit in dc measurement manner Download PDFInfo
- Publication number
- CN203117325U CN203117325U CN 201320060408 CN201320060408U CN203117325U CN 203117325 U CN203117325 U CN 203117325U CN 201320060408 CN201320060408 CN 201320060408 CN 201320060408 U CN201320060408 U CN 201320060408U CN 203117325 U CN203117325 U CN 203117325U
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- circuit
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- unit
- power cable
- grounding state
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- Withdrawn - After Issue
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- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model provides an operating cable grounding state detecting circuit in a dc measurement manner, which can simply and effectively detect grounding state of an operating cable. The circuit comprises a dc signal source, an RC circuit unit, a voltage signal acquisition unit and a data processing unit, wherein the dc signal source is connected with the RC circuit unit in parallel, the whole circuit is connected in series with a ground wire in a shielding layer of a to-be-detected power cable, and the voltage signal acquisition unit is used for acquiring voltages of two ends of the RC circuit unit and sending the voltages to the data processing unit.
Description
Technical field
The utility model relates to a kind of operation cable grounding status detection circuit.
Background technology
Underground power cable is safe and reliable and can greatly improve urban electricity supply circuit environment, in the power supply mode of urban power distribution network, has replaced the power supply mode of overhead transmission line gradually.At present, the use amount of underground cable head and shoulders above the use amount of overhead transmission line.Along with the rapid increase of power cable quantity in the electrical network, the fault of cable is corresponding increasing also.
Cable generally all is laid in the underpass, and in the daily operation management process, except the fault of cable own, the phenomenon of artificially stealing or destroy cable outer layer is also very serious.Press 10kV power cable screen layer to be shelled phenomenon particularly and happen occasionally, the fault of this artificial destruction has caused very big personnel's economic loss to electric power network to a great extent.
At this situation, present domestic various types of low-voltage lighting cable warning systems, aerial cable guard against theft and alarm system, the power failure power cable guard against theft and alarm system of having occurred in succession, but the burglar alarm product at middle pressure operation power cable is few, and general power cable anti-theft device is that monitoring device is sealed in the middle of the screen layer and steel armour of cable.
It is antitheft to utilize the high-frequency signal transmission channel that forms between power cable screen layer and the ground to carry out power cable, when the high-frequency signal transmission channel that forms between power cable screen layer and the ground is destroyed, represents that monitored cable has unusually simultaneously to report to the police.
But, because inserted other media in the middle of giving the power cable screen layer, bring unreliable factor for the operation of power cable.Simultaneously, the monitored power cable of must stopping transport during on-the-spot the installation changes the mounting structure of original power cable, wastes time and energy and is inconvenient to install.
The utility model content
The utility model provides a kind of operation cable grounding state detection circuit and detection method thereof of direct current measurement mode, can detect operation cable grounding state simply, effectively.
The technical solution of the utility model is as follows:
The operation cable grounding state detection circuit of direct current measurement mode comprises dc signal source, RC circuit unit, voltage signal acquisition unit and data processing unit; Described dc signal source is in parallel with the RC circuit unit, and integral body is serially connected with in the ground wire of power cable screen layer to be measured, and the voltage signal acquisition unit is used for gathering RC circuit unit both end voltage and delivering to data processing unit.
Carry out the power cable method of monitoring in real time based on above-mentioned testing circuit, may further comprise the steps:
(1) obtains the normal data of power cable state
For the intact power cable of screen layer, dc signal source injects direct current signal, and the voltage magnitude of voltage signal acquisition unit measure R C circuit unit also records this voltage magnitude;
(2) real-time monitoring power cable state
At power cable to be measured, dc signal source injects direct current signal, and the voltage magnitude of voltage signal acquisition unit measure R C circuit unit is if this voltage judges then that less than the voltage magnitude of step (1) record this power cable screen layer has breakage, sends alarm.
The utlity model has following advantage:
This circuit structure is simple, realizes that cost is low, can detect operation cable grounding state simply, effectively.
In real time monitoring does not influence the normal operation of cable, need not to carry out scanning and the coupling of signal, just can carry out the fault judgement as long as inject direct current signal, so highly versatile, adaptation face width.
Description of drawings
Fig. 1 is measuring principle synoptic diagram of the present utility model.
Wherein, 1-power cable.
Embodiment
If adopt the AC measurment mode, because there is very big distributed capacitance (every kilometer about 0.2uF) in cable, for the AC measurment signal very big relaxation phenomenon is arranged, measuring distance can be very restricted, for 20 kilometers long cables, its AC signal of inject measuring ± more than the 20V, if the more long signal amplitude that needs to inject of distance will be bigger, concurrently injected signal source frequency is also very low, otherwise can influence the ground connection effect of cable 50Hz civil power.
Therefore, the utility model has adopted a kind of measurement scheme of direct current.The core of this scheme provides a kind of effective AC signal path, especially for civil power 50Hz good ground connection is arranged.Owing to be direct current measurement, its measuring distance does not almost disturb for on-line measurement than exchanging meeting farther (greater than 20 kilometers), has proved this point by practical proof repeatedly yet.Measuring principle as shown in Figure 1.
Among Fig. 1 Vf be dc signal source, R0 be signal internal resistance, R1 be less dc partial voltage resistance, C1 for and the both end voltage (voltage magnitude) of the big electric capacity alternating current path of high pressure, the Cx that the connect RC circuit unit that to be distributed capacitance, Vx measure for the voltage signal acquisition unit.
Adopt the direct current measurement mode to carry out the power cable method of monitoring in real time, may further comprise the steps:
(1) obtains the normal data of power cable state
For the intact power cable of screen layer, dc signal source injects direct current signal, and the voltage magnitude of voltage signal acquisition unit measure R C circuit unit also records this voltage magnitude;
(2) real-time monitoring power cable state
At power cable to be measured, dc signal source injects direct current signal, and the voltage magnitude of voltage signal acquisition unit measure R C circuit unit is if this voltage judges then that less than the voltage magnitude of step (1) record this power cable screen layer has breakage, sends alarm.
Claims (1)
1. the operation cable grounding state detection circuit of direct current measurement mode is characterized in that: comprise dc signal source, RC circuit unit, voltage signal acquisition unit and data processing unit; Described dc signal source is in parallel with the RC circuit unit, and integral body is serially connected with in the ground wire of power cable screen layer to be measured, and the voltage signal acquisition unit is used for gathering RC circuit unit both end voltage and delivering to data processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320060408 CN203117325U (en) | 2013-02-01 | 2013-02-01 | Operating cable grounding state detecting circuit in dc measurement manner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320060408 CN203117325U (en) | 2013-02-01 | 2013-02-01 | Operating cable grounding state detecting circuit in dc measurement manner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203117325U true CN203117325U (en) | 2013-08-07 |
Family
ID=48897660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320060408 Withdrawn - After Issue CN203117325U (en) | 2013-02-01 | 2013-02-01 | Operating cable grounding state detecting circuit in dc measurement manner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203117325U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163403A (en) * | 2013-02-01 | 2013-06-19 | 西安秦骊成套电器有限公司 | Traveling cable grounding state detecting circuit and traveling cable grounding state detecting method using direct current measurement mode |
| CN103969550A (en) * | 2014-04-25 | 2014-08-06 | 西安电子科技大学 | On-line anti-theft alarm device for underground power cable |
| CN105974244A (en) * | 2016-06-29 | 2016-09-28 | 西安秦骊成套电器有限公司 | Operating cable grounding state detection circuit and method using variable frequency resonant partial voltage |
| WO2018192873A1 (en) * | 2017-04-20 | 2018-10-25 | Pepperl+Fuchs Gmbh | Intrinsically safe electrical circuit with intrinsically safe interference shield |
-
2013
- 2013-02-01 CN CN 201320060408 patent/CN203117325U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163403A (en) * | 2013-02-01 | 2013-06-19 | 西安秦骊成套电器有限公司 | Traveling cable grounding state detecting circuit and traveling cable grounding state detecting method using direct current measurement mode |
| CN103163403B (en) * | 2013-02-01 | 2015-12-16 | 西安秦骊成套电器有限公司 | A kind of operation cable grounding state detection circuit of direct current measurement mode and method thereof |
| CN103969550A (en) * | 2014-04-25 | 2014-08-06 | 西安电子科技大学 | On-line anti-theft alarm device for underground power cable |
| CN105974244A (en) * | 2016-06-29 | 2016-09-28 | 西安秦骊成套电器有限公司 | Operating cable grounding state detection circuit and method using variable frequency resonant partial voltage |
| CN105974244B (en) * | 2016-06-29 | 2018-12-21 | 西安秦骊成套电器有限公司 | A kind of operation cable grounding condition detection method divided using frequency conversion resonance vibration |
| WO2018192873A1 (en) * | 2017-04-20 | 2018-10-25 | Pepperl+Fuchs Gmbh | Intrinsically safe electrical circuit with intrinsically safe interference shield |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130807 Effective date of abandoning: 20151216 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |